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612 results on '"Système d'exploitation"'

101. Landmark-based data location verification in the cloud : review of approaches and challenges

Author

Irain, Malik, Jorda, Jacques, Mammeri, Zoubir, Temps Réel dans les Réseaux et Systèmes (IRIT-T2RS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Cloud storage, lcsh:Computer engineering. Computer hardware, Landmark-based approaches, Système d'exploitation, Réseaux et télécommunications, lcsh:TK7885-7895, Systèmes embarqués, lcsh:QA75.5-76.95, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Security attacks, Architectures Matérielles, Cloud computing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, lcsh:Electronic computers. Computer science, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Data location verification
Abstract

International audience; Data storage on the cloud is growing every day and many companies, administrations, and individuals are now outsourcing storage of their data to large-scale Cloud Service Providers (CSP). However, because of today’s cloud infrastructure virtualization, data owners cannot easily know the location where their data are stored. Even in case of the establishment of a strong Service-Level Agreement, which includes an initial guarantee regarding data location, the CSP may then move data to another location, like another country, in order to cut storage costs or for any other reasons, including backup mistakes and fraudulent use of data. Data location verification is required due to legal, privacy, and performance constraints. Recently “Where are my data located in the cloud?” has become a challenge and solutions have been proposed to verify data location, under given assumptions regarding CSP behavior. The objective of this paper is twofold: propose a comprehensive classification of the location verification approaches and discuss their vulnerabilities regarding malicious CSP attacks. Location verification solutions may be Framework-based, Hardware-based or Landmark-based. This paper addresses only landmark-based approaches for their deployment flexibility and low cost.

Published
2017

102. On the vulnerabilities of landmark-based data location approaches: threats, solutions, and challenges

Author

Malik Irain, Zoubir Mammeri, Jacques Jorda, Temps Réel dans les Réseaux et Systèmes (IRIT-T2RS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, Système d'exploitation, Réseaux et télécommunications, Cloud computing, computer.software_genre, Computer security, Outsourcing, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Server, Data location verification, Threats, Landmark, Distributed database, business.industry, Landmark-based approaches, Virtualization, Systèmes embarqués, Identification (information), [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Literature survey, computer
Abstract

International audience; Nowadays, many companies, administrations, and individuals are outsourcing the storage of their data to largescale Cloud Service Providers (CSPs). Unfortunately, the modern cloud infrastructure virtualization results in the difficulty or the impossibility for data owners to know the location where their data are stored. Data location verification is required due to legal, privacy, and performance constraints. Recently "Where are my data located in the Cloud?" has become a challenge and solutions have been proposed to verify data location. Even in case of the establishment of a strong Service-Level Agreement, which includes an initial guarantee regarding data location, the CSP may then move the data in another location, like another country, in order to cut the costs or for any other reasons. This paper considers landmark-based verification approaches, which are flexible and low cost compared to other location verification approaches. The objective is the identification of vulnerabilities relating to the main proposed landmark-based location verification approaches when malicious CSPs are involved and the proposal of some countermeasures against CSP's attacks. We present, to the best of our knowledge, the most comprehensive literature survey on vulnerabilities of landmark-based data location approaches.

Published
2017

103. A thorough analysis of the performance of delay distribution models for IEEE 802.11 DCF

Author

Qi Wang, Katia Jaffrès-Runser, Yi Sun, Zhongcheng Li, Christian Fraboul, Jun Li, Jean-Luc Scharbarg, Centre National de la Recherche Scientifique - CNRS (FRANCE), Chinese Academy of Sciences (CHINA), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, Institute of Computing Technology [Beijing] (ICT), Chinese Academy of Sciences [Changchun Branch] (CAS), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), and Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Delay distribution, Computer Networks and Communications, Computer science, Real-time computing, Système d'exploitation, Réseaux et télécommunications, Performance measure, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], IEEE 802.11, Architectures Matérielles, Computer Science::Networking and Internet Architecture, Wireless, Wireless networks, business.industry, Wireless network, IEEE 802.11 DCF, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Systèmes embarqués, Computer Science::Performance, Hardware and Architecture, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Algorithm, Software, Saturated traffic
Abstract

International audience; Deriving the complete distribution of the end-to-end delay in a wireless multi-hop network is of paramount interest when delay-sensitive flows have to be conveyed over such networks. First works have proposed models to derive the total delay distribution of networks assuming the well-known IEEE802.11 DCF medium access (MAC) protocol. Current derivations can be decomposed into two main steps: (i) the calculation of the total delay probability generating function (PGF) and (ii) its numerical inversion. We show in this paper that there is a need for a thorough performance evaluation of these models since both steps introduce errors, naming modeling and inversion errors. We argue that both types of errors have to be analyzed separately to characterize the accuracy of the analytical derivations of the literature. Therefore, this paper defines two performance evaluation metrics that measure the magnitude of both types of errors. Both metrics are illustrated to select and optimize the most accurate model to calculate the single-hop end-to-end delay distribution of nodes using the IEEE802.11 DCF MAC protocol. The most accurate model is extended to calculate the end-to-end delay distribution for a 2-hop wireless communication.

Published
2015

104. Describing Advanced Persistent Threats Using a Multi-agent System Approach

Author

Abdelmalek Benzekri, Ahmad Samer Wazan, Francois Barrere, Romain Laborde, Sravani Teja Bulusu, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Advanced persistent threat, Computer science, Système d'exploitation, Réseaux et télécommunications, 0102 computer and information sciences, 02 engineering and technology, Système multi-agents, computer.software_genre, Computer security, 01 natural sciences, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Server, 0202 electrical engineering, electronic engineering, information engineering, Requirements analysis, Multi-agentsystems, Reusability, Attack trees, Multi-agent system, Multi-agent systems, 020207 software engineering, Systèmes embarqués, Advanced Persistent Threats, 010201 computation theory & mathematics, Software security assurance, [INFO.INFO-MA]Computer Science [cs]/Multiagent Systems [cs.MA], Malware, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], computer, Natural language
Abstract

International audience; Advanced Persistent Threats are increasingly becoming one of the major concerns to many industries and organizations. Currently, there exists numerous articles and industrial reports describing various case studies of recent notable Advanced Persistent Threat attacks. However, these documents are expressed in natural language. This limits the efficient reusability of the threat intelligence information due to ambiguous nature of the natural language. In this article, we propose a model to formally represent Advanced Persistent Threats as multi-agent systems. Our model is inspired by the concepts of agent-oriented social modelling approaches, generally used for software security requirement analysis.

Published
2017

105. StopGap: elastic VMs to enhance server consolidation

Author

Nitu, Vlad-Tiberiu, Djomgwe Teabe, Boris, Fopa, Léon Constantin, Tchana, Alain-Bouzaïde, Hagimont, Daniel, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Cooperation, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Resource management, Système d'exploitation, Réseaux et télécommunications, Cloud computing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Ressource management, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Systèmes embarqués
Abstract

International audience; Virtualized cloud infrastructures (also known as IaaS platforms) generally rely on a server consolidation system to pack virtual machines (VMs) on as few servers as possible. However, an important limitation of consolidation is not addressed by such systems. Because the managed VMs may be of various sizes (small, medium, large, etc.), VM packing may be obstructed when VMs do not fit available spaces. This phenomenon leaves servers with a set of unused resources (‘holes’). It is similar to memory fragmentation, a well‐known problem in operating system domain. In this paper, we propose a solution which consists in resizing VMs so that they can fit with holes. This operation leads to the management of what we call elastic VMs and requires cooperation between the application level and the IaaS level, because it impacts management at both levels. To this end, we propose a new resource negotiation and allocation model in the IaaS, called HRNM. We demonstrate HRNM's applicability through the implementation of a prototype compatible with two main IaaS managers (OpenStack and OpenNebula). By performing thorough experiments with SPECvirt_sc2010 (a reference benchmark for server consolidation), we show that the impact of HRNM on customer's application is negligible. Finally, using Google data center traces, we show an improvement of about 62.5% for the traditional consolidation engines.

Published
2017

106. Extended recursive analysis for tilera tile64 NoC architectures: towards inter-NoC delay analysis

Author

Jérôme Ermont, Jean-Luc Scharbarg, Hamdi Ayed, Christian Fraboul, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, TILE64, Short paper, Worst-case traversal time (WCTT ), Système d'exploitation, Delay analysis, Réseaux et télécommunications, 02 engineering and technology, Parallel computing, Hardware_PERFORMANCEANDRELIABILITY, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Computer Science (miscellaneous), Hardware_INTEGRATEDCIRCUITS, Worst-case traversal time (WCTT), Engineering (miscellaneous), 020208 electrical & electronic engineering, Avionics, ComputerSystemsOrganization_PROCESSORARCHITECTURES, Systèmes embarqués, 020202 computer hardware & architecture, Tree traversal, Network-on-Chip (NoC), AFDX, Computer architecture, Recursive analysis, Recursive Calculus, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Heterogeneous network
Abstract

International audience; A heterogeneous network, where a switched-Ethernet backbone, e.g. AFDX, interconnects several end systems based on Network-on-Chip (NoC), is a promising candidate to build new avionics architectures. When using such a heterogeneous network for real-time applications, a global worst-case traversal time (WCTT) analysis is needed. In this short paper we focus on the intra-NoC communication on a Tilera TILE64-like NoC. First, we extend the Recursive Calculus (RC) to achieve tighter intra-NoC WCTT. Then, we explain how this intra-NoC WCTT analysis could be used in a compositional manner for the end-to-end inter-NoC delay analysis.

Published
2017

107. A comparative analysis with validation of NSGA-III and MOEA/D in resolving the 3D indoor redeployment problem in DL-IoT

Author

Sami Mnasri, Adrien van den Bossche, Thierry Val, Nejah Nasri, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire d'électronique et des technologies de l'Information [Sfax] (LETI), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Institut Universitaire de Technologie - IUT (Blagnac, France), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), École Nationale d'Ingénieurs de Sfax - ENIS (TUNISIA), Université de Sfax (TUNISIA), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), and Université Toulouse - Jean Jaurès (UT2J)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], 0209 industrial biotechnology, Coverage, Computer science, Distributed computing, Système d'exploitation, NSGA-III, Evolutionary algorithm, Access method, Réseaux et télécommunications, MOEA/D, 02 engineering and technology, Solid modeling, Keywords 3D indoor deployment, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 020901 industrial engineering & automation, Architectures Matérielles, Ad hoc On-Demand Distance Vector Routing, 0202 electrical engineering, electronic engineering, information engineering, RSSI, Protocol (object-oriented programming), Hybrid localization, WiNo nodes, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Physical layer, Systèmes embarqués, FER, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, 020201 artificial intelligence & image processing, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Routing (electronic design automation), Wireless sensor network, Simulation
Abstract

International audience; Compared to the two-dimensional one, the three-dimensional deployment in WSNs (wireless sensor networks) is more complex and real. In this paper, the problem of 3D positioning of nodes is studied while minimizing the number of nodes and the consumption of energy; and maximizing the coverage area and the localization rate. Indeed, the aim is to choose the ideal 3D positions in which new nodes are added while optimizing the mentioned objectives. The proposed approach is based on two evolutionary algorithms (MOEA/D and NSGA-III). The simulation model takes into account the implementation of a 433 MHz physical layer, a non-coordinated IEEE 802.15.4 CSMA/CA access method, and a reactive AODV based protocol for routing layer. The obtained results of the simulations with OMNeT++ are presented to prove the effectiveness of the proposed approach.

Published
2017

108. The 3D Redeployment of Nodes in Wireless Sensor Networks with Real Testbed Prototyping

Author

Nejah Nasri, Adrien van den Bossche, Thierry Val, Sami Mnasri, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), Laboratoire d'électronique et des technologies de l'Information [Sfax] (LETI), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université de Sfax (TUNISIA), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, Distributed computing, 3D indoor redeployment, Système d'exploitation, NSGA-III, Réseaux et télécommunications, 02 engineering and technology, Many-objective optimization, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Preference incorporation, business.industry, Testbed, Prototyping, Systèmes embarqués, Key distribution in wireless sensor networks, Software deployment, DL-IoT, 020201 artificial intelligence & image processing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Wireless sensor network, Realization (systems), Computer network
Abstract

In wireless sensor networks (WSNs), prototyping systems facilitate the realization of real node deployment, enabling to test new algorithms, protocols, and networking solutions. This paper investigates the 3D indoor redeployment problem in WSNs by finding the positions where nodes should be added in order to improve an initial deployment while optimizing different objectives. For this purpose, an approach based on a recent evolutionary optimization algorithm (NSGA-III) is used. The latter algorithm is hybridized with a strategy of incorporating of the user preferences (PI-EMO-VF). The major contributions of this work are as follows: testing the NSGA-III efficiency in the case of real world problems, comparing it with another recent many-objective algorithm (MOEA/DD), and incorporating the concept of preferences of users into NSGA-III. The real experiments performed on our testbeds indicate that the results given by the proposed algorithm are better than those given by other recent optimization algorithms such as MOEA/DD.

Published
2017

109. Mastering system and power measures for servers in datacenter

Author

Georges Da Costa, Leandro F. Cupertino, Jean-Marc Pierson, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], General Computer Science, Computer science, Master system, Distributed computing, Real-time computing, Système d'exploitation, Réseaux et télécommunications, Cloud computing, 02 engineering and technology, Datacenter, System measure, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Server, Research community, 0202 electrical engineering, electronic engineering, information engineering, Electrical and Electronic Engineering, 020203 distributed computing, Measure (data warehouse), business.industry, Performance counters, Methodology, Systèmes embarqués, Power (physics), Power consumption, Power measure, 020201 artificial intelligence & image processing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business
Abstract

International audience; Using power meters and performance counters to get insight on system's behavior in terms of power consumption is common nowadays. The values coming from these external or internal meters are usually used directly by the research community, for instance to derive higher-level power models with learning techniques or to use them in decision tools such as schedulers in HPC and Cloud Computing. While it is reasonable when one wants only to have a broad view on the power consumption, they can not be used directly in most cases: We prove in this article that the problems of distributed measure and hardware limits are way more complex and create bias, and we give the keys to understand and chose the proper methodology to handle these bias to obtain relevant values for enhanced usage. A generic methodology is analyzed and its main lessons extracted for a direct usage by the research community to master system and power measures for servers in datacenter.

Published
2017

110. Which Security Requirements Engineering Methodology Should I Choose?

Author

Francois Barrere, Abdelmalek Benzekri, Ahmad Samer Wazan, Romain Laborde, Sravani Teja Bulusu, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Requirements management, Requirement, Non-functional requirement, Requirements engineering, Computer science, Système d'exploitation, Réseaux et télécommunications, 020207 software engineering, 02 engineering and technology, Requirements elicitation, Security requirements engineering, Systèmes embarqués, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Security engineering, Goal modeling, Risk analysis (engineering), Architectures Matérielles, 020204 information systems, Evaluation methodology, 0202 electrical engineering, electronic engineering, information engineering, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Requirements analysis
Abstract

International audience; Since many decades, requirements engineering domain has seen significant enhancements towards adapting the security and risk analysis concepts. In this regard, there exist numerous security requirements engineering methodologies that support elicitation and evaluation of the security requirements. However, selecting a security requirements engineering methodology (SRE) for a given context of use often depends on a set of ad hoc criteria. In this paper, we propose a methodological evaluation methodology that helps in identifying the characteristics of a good SRE methodology.

Published
2017

111. A new approach for managing Android permissions: learning users' preferences

Author

Oglaza, Arnaud, Laborde, Romain, Zaraté, Pascale, Benzekri, Abdelmalek, Barrère, François, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Argumentation, Décision, Raisonnement, Incertitude et Apprentissage (IRIT-ADRIA), Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], lcsh:Computer engineering. Computer hardware, Système d'exploitation, Réseaux et télécommunications, lcsh:TK7885-7895, Systèmes embarqués, lcsh:QA75.5-76.95, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Android permission, Access control model, Architectures Matérielles, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, lcsh:Electronic computers. Computer science, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], H- INFORMATIQUE, Recommender system
Abstract

International audience; Today, permissions management solutions on mobile devices employ Identity Based Access Control (IBAC) models. If this approach was suitable when people had only a few games (like Snake or Tetris) installed on their mobile phones, the current situation is different. A survey from Google in 2013 showed that, on average, french users have installed 32 applications on their Android smartphones. As a result, these users must manage hundreds of permissions to protect their privacy. Scalability of IBAC is a well-known issue and many more advanced access control models have introduced abstractions to cope with this problem. However, such models are more complex to handle by non-technical users. Thus, we present a permission management system for Android devices that (1) learns users' privacy preferences with a novel learning algorithm, (2) proposes them abstract authorization rules, and (3) provides advanced features to manage these high-level rules. Our learning algorithm is compared to two other well-known approaches to show its efficiency. Finally, we prove this whole approach is more efficient than current permission management system by comparing it to Privacy Guard Manager.

Published
2017

112. Sampling from Arbitrary Centered Discrete Gaussians for Lattice-Based Cryptography

Author

Aguilar Melchor, Carlos, Albrecht, Martin R., Ricosset, Thomas, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Royal Holloway [University of London] (RHUL), THALES COMMUNICATIONS & SECURITY, THALES, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Thales (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Royal Holloway University of London - RHUL (UNITED KINGDOM), Thales Communications and Security (Gennevilliers, France), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Discrete Gaussian distribution, Architectures Matérielles, Lattice-based constructions, Système d'exploitation, Cryptography, Réseaux et télécommunications, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Systèmes embarqués, Non-centered CDT algorithm
Abstract

International audience; Non-Centered Discrete Gaussian sampling is a fundamental building block in many lattice-based constructions in cryptography, such as signature and identity-based encryption schemes. On the one hand, the center-dependent approaches, e.g. cumulative distribution tables (CDT), Knuth-Yao, the alias method, discrete Zigurat and their variants, are the fastest known algorithms to sample from a discrete Gaussian distribution. However, they use a relatively large precomputed table for each possible real center in [0,1) making them impracticable for non-centered discrete Gaussian sampling. On the other hand, rejection sampling allows to sample from a discrete Gaussian distribution for all real centers without prohibitive precomputation cost but needs costly floating-point arithmetic and several trials per sample. In this work, we study how to reduce the number of centers for which we have to precompute tables and propose a non-centered CDT algorithm with practicable size of precomputed tables as fast as its centered variant. Finally, we provide some experimental results for our open-source C++ implementation indicating that our sampler increases the rate of Peikert’s algorithm for sampling from arbitrary lattices (and cosets) by a factor 3 with precomputation storage up to 6.2 MB.

Published
2017

113. AirNet: An Edge-Fabric abstraction model to manage software-defined networks

Author

Aouadj, Messaoud, Lavinal, Emmanuel, Desprats, Thierry, Sibilla, Michelle, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Mapping, Architectures Matérielles, Système d'exploitation, Software‐defined networking, Réseaux et télécommunications, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Networks, Systèmes embarqués, Network control language
Abstract

International audience; Software‐defined networking (SDN) is one of the most significant initiatives to make current networks easier to configure, test, debug, and evolve. Within an SDN ecosystem, the Northbound interface is used by operators to define policies and to program the control plane, it thus represents a major challenge. Ideally, this northbound interface should allow administrators to describe, as simply as possible, network services and their interactions, rather than specifying how and on what physical device they need to be deployed. In this article, we propose a new network control language, called AirNet, which is built on top of an abstraction model whose main feature is to provide a clear separation between edge and core network devices. Thus, logical boundaries between different types of policies will exist (control, data, and transport services), ensuring modularity and reusability of the control program. An implementation of the AirNet language has also been done, which includes in particular a hypervisor that achieves the composition of the control policies on the virtual network and their mapping on the physical infrastructure. Finally, several experiments showing promising results have been conducted on different use cases.

Published
2017

114. A Help Management System to Support Peer Instruction in Remote Laboratories

Author

Rémi Venant, Julien Broisin, Philipe Vidal, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), DAS-EEAE, Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Computer science, [SHS.EDU]Humanities and Social Sciences/Education, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, Help-seeking, User interactions, computer.software_genre, Help-giving, World Wide Web, Architectures Matérielles, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, [INFO]Computer Science [cs], Set (psychology), Remote laboratory, Multimedia, 05 social sciences, Virtual and remote laboratories, 050301 education, Systèmes embarqués, Peer instruction, Management system, [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, 0503 education, computer
Abstract

International audience; Help between peers, intended to positively influence learning, appears as a suitable activity for inquiry learning. While several studies reveal evidence that effective help-seeking and help-giving behaviors can improve learning, virtual and remote laboratories do not provide sufficient support to enable these social interactions. Based on a set of criteria defined from existing literature, we designed a management system and implemented it in Lab4CE, a remote laboratory environment for Computer Education. The first results of two experimentations reveal that learners do not tend to help each other spontaneously, while the presence of a teacher increases self-confidence on help given.

Published
2017

115. Designing an energy efficient UAV tracking algorithm

Author

Leila Azouz Saidane, Hanen Idoudi, Benoit Escrig, Riadh Dhaou, Mouna Elloumi, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Signal et Communications (IRIT-SC), Institut National Polytechnique (Toulouse) (Toulouse INP), Centre de Recherche Réseau Image SysTème Architecture et MuLtimédia (CRISTAL), École Nationale des Sciences de l'Informatique [Manouba] (ENSI), Université de la Manouba [Tunisie] (UMA)-Université de la Manouba [Tunisie] (UMA), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale des Sciences de l'Informatique - ENSI (TUNISIA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université de la Manouba - UMA (TUNISIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], 0209 industrial biotechnology, Computer science, Système d'exploitation, Réseaux et télécommunications, ComputerApplications_COMPUTERSINOTHERSYSTEMS, 02 engineering and technology, Tracking (particle physics), Computer Science::Robotics, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 020901 industrial engineering & automation, 0203 mechanical engineering, Mobile target, Computer Science::Systems and Control, Architectures Matérielles, Limit (music), Unmanned Aerial Vehicle (UAV), Tracking, Camera field of view, 020302 automobile design & engineering, Energy consumption, Systèmes embarqués, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Astrophysics::Earth and Planetary Astrophysics, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Algorithm, Energy (signal processing), Efficient energy use
Abstract

International audience; In this paper, we present a solution for Unmanned Aerial Vehicle (UAV) energy saving problem while ensuring a continuous tracking of a mobile target. Our tracking algorithm is based on three zones, and according to the target placement in those zones, the UAV will do a specific type of actions. We proposed an additional zone called the authorized zone. In this zone, the UAV keeps a fixed velocity and a fixed altitude, and this contributes to the limitation of the energy consumption while also maintaining a minimal altitude. We also proposed an adapted criterion which considers the velocity, altitude and acceleration changes to evaluate the energy consumption. The idea here is to limit the number of the UAV adjustments to reduce the energy consumption and still keeping the target in its camera field of view.

Published
2017

116. Experimental Analysis in SDN Open Source Environment

Author

Wasimon Panichpattanakul, Beatrice Paillassa, Kuljaree Tantayakul, Riadh Dhaou, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), Prince of Songkla University (PSU), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Prince of Songkla University - PSU (THAILAND), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], OpenFlow, Computer science, Système d'exploitation, OVS, Réseaux et télécommunications, 02 engineering and technology, computer.software_genre, Blocking (statistics), Consistency (database systems), [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Packet loss, Architectures Matérielles, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, CPqD, Throughput (business), Emulation, Firmware, business.industry, 020206 networking & telecommunications, Systèmes embarqués, Software-defined Network, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Software-defined networking, business, computer, Computer network
Abstract

International audience; The paper focuses on the free products used to setup an Software-Defined Network by emulation and real experimentation. Because SDN networking is a challenging research area, objective of this paper is to provide assistance to researchers wishing to evaluate their SDN work in an experimental setting. In this paper, two collections of open source OpenFlow switches; Open vSwitch (OVS) and ofsoftswitch13 (CPqD), which support new version of OpenWRT firmware and the testing switches in our laboratory, have been emulated and implemented in real networks. The performances of OVS and CPqD in terms of UDP throughput, TCP throughput and percentage of the packet loss have been analyzed. The results indicate the consistency of the results obtained by emulation and experimentation and highlight the blocking parameter of the switch processing capacity.

Published
2017

117. Heuristiques d'ordonnancement pour les centres de données alimentés par énergies renouvelables

Author

Grange, Léo, Stolf, Patricia, Da Costa, Georges, Sayah, Amal, Institut de recherche en informatique de Toulouse ( IRIT ), Institut National Polytechnique [Toulouse] ( INP ) -Université Toulouse 1 Capitole ( UT1 ) -Université Toulouse - Jean Jaurès ( UT2J ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), Université Toulouse III - Paul Sabatier (UT3), and ANR-15-CE25-0012,DATAZERO,Datacenters robustes utilisant de l'énergie renouvelable(2015)

Subjects
[ INFO.INFO-DC ] Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Architectures Matérielles, Ordonnancement en ligne, Centre de données, Système d'exploitation, Energies renouvelables, Réseaux et télécommunications, [INFO.INFO-DC]Computer Science [cs]/Distributed, Parallel, and Cluster Computing [cs.DC], Systèmes embarqués
Abstract

International audience; La consommation d'énergie des centres de données est un sujet qui est devenu, au cours des dernières années, de plus en plus important. L'utilisation de sources d'énergies renouvelables pour alimenter ces derniers est une perspective intéressante pour réduire, à terme, leur coût d'exploitation et leur impact écologique. Cependant, la nature intermittente des principales énergies renouvelables pose de nouveaux problèmes. Dans cet article, nous proposons une approche d'ordonnancement de tâches prenant en compte la disponibilité des énergies renouvelables pour maximiser leur utilisation. Nous avons implémenté cette approche dans un simulateur de centre de données et l'avons évaluée en considérant un centre alimenté par des panneaux photovoltaïques et connecté au réseau électrique. Les résultats indiquent une réduction de la consommation d'énergie non renouvelable jusqu'à 49% comparé à un ordonnancement classique ne prenant pas en compte la disponibilité de l'énergie renouvelable.

Published
2017

118. Maintaining a permanent connectivity between nodes of an air-to-ground communication network

Author

Riadh Dhaou, Dorin Rautu, Emmanuel Chaput, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées, Ecole Nationale Supérieure d'Electrotechnique, d'Electronique, d'Informatique, d'Hydraulique et de Télécommunications (ENSEEIHT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Handover, Cover (telecommunications), Computer science, Wireless ad hoc network, UAV, Système d'exploitation, Réseaux et télécommunications, ComputerApplications_COMPUTERSINOTHERSYSTEMS, 02 engineering and technology, Computer security, computer.software_genre, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_MISCELLANEOUS, Routing, 020203 distributed computing, business.industry, 020206 networking & telecommunications, Telecommunications network, Systèmes embarqués, Ad-hoc networks, Drone, OLSR, Optimized Link State Routing Protocol, Cellular network, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, computer, Computer network
Abstract

International audience; Unmanned Aerial Vehicles (UAVs) can be a solution for deploying temporary networks by serving as Access Points to users on the ground. The aim is to provide multiple communication services (voice, data, video, etc.) over a specific area. The network must be deployed quickly for a relatively short period (emergency situations, sporting events, etc.), in the case of cellular network overload or blackout. A Flying Ad-Hoc Network will be deployed to cover all the potential users. The objective of this paper is to investigate the impact of drone replacement due to the limitation of battery lifetime. A constraint for this kind of network is service continuity. For this purpose, an adaptation for the routing mechanism is proposed, to overcome the loss of connectivity observed in the simulations. In the beginning, a state of the art on use cases employing drones is given, followed by a description of our scenario. Thenceforth, the system is described as well as the deployment mechanism and the induced connectivity loss. In the end, we present a way to adapt the routing scheme so that the network remains connected when a node is replaced due to energy level reasons.

Published
2017

119. Unified modeling of quality of context and quality of situation for context-aware applications in the internet of things

Author

Amel Bouzeghoub, Pierrick Marie, Thierry Desprats, Anis Ahmed-Nacer, Sophie Chabridon, Algorithmes, Composants, Modèles Et Services pour l'informatique répartie (ACMES-SAMOVAR), Services répartis, Architectures, MOdélisation, Validation, Administration des Réseaux (SAMOVAR), Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP)-Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP), Département Informatique (INF), Institut Mines-Télécom [Paris] (IMT)-Télécom SudParis (TSP), Centre National de la Recherche Scientifique (CNRS), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Paris-Saclay (FRANCE), Telecom ParisTech (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), and Télécom Paris (FRANCE)

Subjects
Context dimension, Situation identification, Knowledge management, Computer science, Process (engineering), media_common.quotation_subject, Internet of Things, Système d'exploitation, Inference, Réseaux et télécommunications, Context (language use), 02 engineering and technology, [INFO.INFO-SE]Computer Science [cs]/Software Engineering [cs.SE], 01 natural sciences, Fuzzy logic, [INFO.INFO-IU]Computer Science [cs]/Ubiquitous Computing, Web of Things, Operator (computer programming), Architectures Matérielles, Context data, Quality of situation, 0202 electrical engineering, electronic engineering, information engineering, Quality (business), 0101 mathematics, Ontological reasoning, media_common, business.industry, Order weight average, Context-aware computing, 010102 general mathematics, Context, Quality of context, 020206 networking & telecommunications, Data science, Systèmes embarqués, Identification (information), business
Abstract

International audience; This paper discusses the requirements of situation identification in the Internet of Things and the necessity to consider the quality of the input context data during the inference process for deriving a situation and evaluating its resulting quality. We propose to extend previous works by integrating the QoCIM meta-model within the muSIC framework dedicated to situation identification. Situation identification is derived using an ontological approach and Quality criteria are aggregated using the fuzzy Choquet operator for computing the quality of a situation. This paper shows that QoCIM allows to model quality of context (QoC) as well as quality of situation in a unified approach

Published
2017

120. Étude du comportement des apprenants en situation de travaux pratiques et de sa corrélation sur leur réussite académique

Author

Venant, Rémi, Sharma, Kshitij, Vidal, Philippe, Dillenbourg, Pierre, Broisin, Julien, Institut de recherche en informatique de Toulouse ( IRIT ), Institut National Polytechnique [Toulouse] ( INP ) -Université Toulouse 1 Capitole ( UT1 ) -Université Toulouse - Jean Jaurès ( UT2J ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Computer-Human Interaction in Learning and Instruction Lab - CHILI (Lausanne, Suisse), Ecole Polytechnique Fédérale de Lausanne - EPFL (SWITZERLAND), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Computer-Human Interaction in Learning and Instruction (CHILI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), ATIEF, DAS-EEAE, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Laboratoire distants, Etude comportementale, [SHS.EDU]Humanities and Social Sciences/Education, [ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], Système d'exploitation, Stratégies d’apprentissage, Réseaux et télécommunications, Systèmes embarqués, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Architectures Matérielles, [ INFO.INFO-OS ] Computer Science [cs]/Operating Systems [cs.OS], Apprentissage de l’informatique, [INFO]Computer Science [cs], [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, [ INFO.INFO-AR ] Computer Science [cs]/Hardware Architecture [cs.AR], [ INFO.INFO-ES ] Computer Science [cs]/Embedded Systems, Learning analytics
Abstract

International audience; Cette étude s’appuie sur les méthodes d’analyse des usages pour identifier de nouveaux facteurs de succès de l’apprentissage. Son originalité réside dans l’exploration des liens existants entre le comportement des apprenants pendant des activités de travaux pratiques et leur performance académique. À partir de traces issues d’expérimentations menées en contexte d’apprentissage réel, nous découvrons dans un premier temps un ensemble de motifs d’actions récurrents avant de définir des stratégies d’apprentissage de plus haut niveau d’abstraction. Les résultats montrent l’existence de corrélations entre certaines stratégies et la performance des apprenants : la construction progressive d’une action complexe, ou la réflexion avant l’exécution d’une action, sont deux stratégies appliquées plus fréquemment par les étudiants performants au test final. À partir de ces résultats, nous avons implanté pour les étudiants, mais aussi pour les enseignants, de nouveaux outils de guidage et de tutorat au sein de notre plateforme de travaux pratiques.

Published
2017

121. Mixed integer linear programming for quality of service optimization in Clouds

Author

Pierre Lopez, Georges Da Costa, Christian Artigues, Thierry Monteil, Tom Guérout, Yacine Gaoua, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Équipe Recherche Opérationnelle, Optimisation Combinatoire et Contraintes (LAAS-ROC), Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1)

Subjects
Multiobjective Optimization, Computer Networks and Communications, Heuristic (computer science), Computer science, Distributed computing, Système d'exploitation, Réseaux et télécommunications, Quality of Service, Cloud computing, 02 engineering and technology, Multi-objective optimization, Nonlinear programming, Quality of service, Architectures Matérielles, Mixed integer linear programming, Genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, DVFS, Integer programming, Multiobjective optimization, Genetic Algorithm, business.industry, Heuristic, 020206 networking & telecommunications, [INFO.INFO-RO]Computer Science [cs]/Operations Research [cs.RO], Cloud Computing, Systèmes embarqués, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, Mixed Integer Linear Programming, Hardware and Architecture, 020201 artificial intelligence & image processing, Decomposition method (constraint satisfaction), Heuristics, business, Software
Abstract

International audience; The analysis of the Quality of Service (QoS) level in a Cloud Computing environment becomes an attractive researchdomain as the utilization rate is daily higher and higher. Its management has a huge impact on the performance ofboth services and global Cloud infrastructures. Thus, in order to nd a good trade-o, a Cloud provider has to takeinto account many QoS objectives, and also the manner to optimize them during the virtual machines allocationprocess. To tackle this complex challenge, this article proposed a multiobjective optimization of four relevantCloud QoS objectives, using two different optimization methods: a Genetic Algorithm (GA) and a Mixed IntegerLinear Programming (MILP) approach. The complexity of the virtual machine allocation problem is increasedby the modeling of Dynamic Voltage and Frequency Scaling (DVFS) for energy saving on hosts. A global mixed-integer non linear programming formulation is presented and a MILP formulation is derived by linearization. Aheuristic decomposition method, which uses the MILP to optimize intermediate objectives, is proposed. Numerousexperimental results show the complementarity of the two heuristics to obtain various trade-os between the differentQoS objectives.

Published
2017

122. SaaS for Energy Efficient Utilization of HPC Resources of Linear Algebra Calculations

Author

Georges Da Costa, Wahi Narsisian, Hrachya Astsatryan, Institute for Informatics and Automation Problems, NAS of Armenia, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), National Academy of Sciences of the Republic of Armenia (ARMENIA), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Service (systems architecture), General Computer Science, Computer science, Real-time computing, Système d'exploitation, Réseaux et télécommunications, Cloud computing, 7. Clean energy, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Cloud service, DVFS, Linear algebra, Energy efficient utilization, business.industry, Software as a service, Supercomputer, Systèmes embarqués, Energy accounting, Reliability engineering, HPC, Alternative energy, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Energy (signal processing), Efficient energy use
Abstract

International audience; The most important factor of High performance computing (HPC) systems nowadays is to limit or decrease the power consumption while preserving a high utilization. And with the availability of alternative energy, which powers such systems, there is a need to maximize the usage of alternative energy over brown power. For now, the usage of alternative energy is varying in time due to different factors such as sunny days, the wind, etc. and it is crucial to have an energy-aware algorithm to maximize the usage of this energy. In this paper a SaaS service is presented to optimize a usage of alternative energy, to reduce the power consumption and to preserve a best possible percentage of resource utilization.

Published
2017

123. Inter-flow and intra-flow interference mitigation routing in wireless mesh networks

Author

Thierry Val, Hanen Idoudi, Leila Azouz Saidane, Chiraz Houaidia, Adrien van den Bossche, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Nationale des Sciences de l'Informatique - ENSI (TUNISIA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université de la Manouba - UMA (TUNISIA), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut de Recherche en Informatique de Toulouse - IRIT (Toulouse, France), Université de la Manouba [Tunisie] (UMA), École Nationale des Sciences de l'Informatique [Manouba] (ENSI), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), Université de la Manouba [Tunisie], Ecole Nationale des sciences de l'informatique [Manouba] ( ENSI ), Institut de recherche en informatique de Toulouse ( IRIT ), Institut National Polytechnique [Toulouse] ( INP ) -Université Toulouse 1 Capitole ( UT1 ) -Université Toulouse - Jean Jaurès ( UT2J ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Dynamic Source Routing, Computer science, Distributed computing, Routing table, [ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], Enhanced Interior Gateway Routing Protocol, Réseaux et télécommunications, Geographic routing, 02 engineering and technology, Metrics, Routing Information Protocol, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], 0508 media and communications, Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Computer Science::Networking and Internet Architecture, [ INFO.INFO-ES ] Computer Science [cs]/Embedded Systems, Hierarchical routing, Static routing, Zone Routing Protocol, Wireless mesh network, Quality of service, 05 social sciences, Path vector protocol, Systèmes embarqués, Link-state routing protocol, Multipath routing, [ INFO.INFO-OS ] Computer Science [cs]/Operating Systems [cs.OS], Hazy Sighted Link State Routing Protocol, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Computer network, Routing protocol, Computer Networks and Communications, Equal-cost multi-path routing, Système d'exploitation, Wireless Routing Protocol, QoS, 050801 communication & media studies, Throughput, Available bandwidth, Destination-Sequenced Distance Vector routing, Routing, business.industry, Policy-based routing, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, Optimized Link State Routing Protocol, Routing domain, [ INFO.INFO-AR ] Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Conflict graph, business, Interference
Abstract

International audience; In this paper, we address the problem of QoS support in an heterogeneous multi-rate wireless mesh network. We propose a new routing metric that provides information about link quality, based on PHY and MAC characteristics, including the link availability, the loss rate and the available bandwidth. This metric allows to apprehend inter-flow interferences and avoid bottleneck formation by balancing traffic load on the links. Based on the conflict graph model and calculation of maximal cliques, we define a method to estimate the available bandwidth of a path which considers, in addition, intra-flow interferences. Finally, we propose a routing protocol that supports this metric and we study by simulation its performances compared to different existing routing metrics and protocols. The results revealed the ability of our protocol (LARM) to support the network scalability as well as its ability to choose routes with high throughput and limited delay, thus, better delivery of data traffic.

Published
2017

124. A Study of Learners' Behaviors in Hands-On Learning Situations and Their Correlation with Academic Performance

Author

Julien Broisin, Pierre Dillenbourg, Philippe Vidal, Rémi Venant, Kshitij Sharma, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Polytechnique Fédérale de Lausanne - EPFL (SWITZERLAND), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Ecole Polytechnique Fédérale de Lausanne (EPFL), Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
Computer science, Système d'exploitation, Experiential education, Réseaux et télécommunications, Context (language use), 02 engineering and technology, computer.software_genre, Session (web analytics), [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], Correlation, Architectures Matérielles, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, Mathematics education, ComputingMilieux_COMPUTERSANDEDUCATION, Learning, [INFO]Computer Science [cs], Remote laboratory, Abstraction (linguistics), Multimedia, 4. Education, 05 social sciences, 050301 education, Systèmes embarqués, Tutoring tools, Test (assessment), Action (philosophy), [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, 0503 education, computer
Abstract

International audience; This study analyzes students’ behavior in our remote laboratory environment and aims at identifying behavioural patterns during a practical session that lead to better learning outcomes, in order to predict learners’ performance and to automatically guide students who might need more support. Based on data collected from an experimentation conducted in an authentic learning context, we discover recurrent sequential patterns of actions that lead us to the definition of learning strategies as indicators of higher level of abstraction. Results show that some of the strategies are correlated to the learners’ performance at the final assessment test. For instance, construction of a complex action step by step, or reflexion before submitting an action, are two strategies applied more often by learners of a higher level of performance than by others. These findings led us to instrument for both students and instructors new guiding and tutoring tools in our remote lab environment.

Published
2017

125. Energy Optimization Methodology for e-Infrastructure Providers

Author

Astsatryan, Hrachya, Narsisian, Wahi, Kocharyan, Aram, Da Costa, Georges, Hankel, Albert, Oleksiak, Ariel, Institute for Informatics and Automation Problems, NAS of Armenia, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), SURFnet (Utrecht, Pays-Bas), SURFnet (NETHERLANDS), Poznan Supercomputing and Networking Center (PSNC), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), National Academy of Sciences of the Republic of Armenia (ARMENIA), Poznan Supercomputing and Networking Center - PSNC (POLAND), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Système d'exploitation, Réseaux et télécommunications, Systèmes embarqués, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Green ICT, Virtualization, Nesus, E-infrastructure, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, DVFS, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Energy optimisation, Memory ballooning
Abstract

International audience; The environmental protection is a dominant concern for all types of industries, organizations, and governments. In this regard, the reduction of the energy consumption is substantial in bringing down the CO2 gas emission, which is considered as an important factor causing global warming. The e-infrastructure service providers, such as National Research and Education Networks or National Grid Initiatives have crucial role in the context of energy awareness because the energy consumption of the networking, data, and computational infrastructures keeps increasing exponentially over the time. In addition to this, scientific gateways and cloud services are becoming more significant to tackle scientific and societal challenges. Therefore, there is a need to provide robust and reliable services taking into account energy consumption aspect of e-infrastructures. The aim of the article is to introduce an energy optimization methodology for the beneficiaries of the e-infrastructures to explore, optimize, and report the energy consumption and CO2 emission of data, computing, and networking facilities. The suggested methodology has been implemented within the Armenian e-infrastructure aiming at the reduction of the energy consumption and thereby the CO2 emission.

Published
2017

126. The lock holder and the lock waiter pre-emption problems: nip them in the bud using informed spinlocks (I-Spinlocks)

Author

Alain Tchana, Vlad Nitu, Boris Teabe, Daniel Hagimont, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Critical section, Hardware virtualization, Busy waiting, Computer science, Readers–writer lock, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, Thread (computing), computer.software_genre, 01 natural sciences, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Spinlock, Architectures Matérielles, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Multi-core, 010302 applied physics, 020203 distributed computing, Scheduler, business.industry, Hypervisor, Virtualization, Systèmes embarqués, Virtual machine, Spinlocks, Embedded system, Operating system, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, computer
Abstract

International audience; In native Linux systems, spinlock's implementation relies on the assumption that both the lock holder thread and lock waiter threads cannot be preempted. However, in a virtualized environment, these threads are scheduled on top of virtual CPUs (vCPU) that can be preempted by the hypervisor at any time, thus forcing lock waiter threads on other vCPUs to busy wait and to waste CPU cycles. This leads to the well-known Lock Holder Preemption (LHP) and Lock Waiter Preemption (LWP) issues. In this paper, we propose I-Spinlock (for Informed Spinlock), a new spinlock implementation for virtualized environments. Its main principle is to only allow a thread to acquire a lock if and only if the remaining time-slice of its vCPU is sufficient to enter and leave the critical section. This is possible if the spinlock primitive is aware (informed) of its time-to-preemption (by the hypervisor). We implemented I-Spinlock in the Xen virtualization system. We show that our solution is compliant with both para-virtual and hardware virtualization modes. We performed extensive performance evaluations with various reference benchmarks and compared our solution to previous solutions. The evaluations demonstrate that I-Spinlock outperforms other solutions, and more significantly when the number of core increases.

Published
2017

127. TDMA versus CSMA/CA for wireless multi-hop communications: a stochastic worst-case delay analysis

Author

Zhulin An, Jean-Luc Scharbarg, Christian Fraboul, Qi Wang, Yongjun Xu, Katia Jaffrès-Runser, Centre National de la Recherche Scientifique - CNRS (FRANCE), Chinese Academy of Sciences (CHINA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institute of Computing Technology [Beijing] (ICT), Chinese Academy of Sciences [Changchun Branch] (CAS), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Wi-Fi array, Computer science, Time division multiple access, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, Stochastic worst-case end-to-end delay, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Wireless multi-hop networks, Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Multiple Access with Collision Avoidance for Wireless, Mobile wireless sensor network, Wireless, Electrical and Electronic Engineering, Hidden node problem, Wireless network, business.industry, Multi-frequency time division multiple access, IEEE802.11 DCF, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, Systèmes embarqués, Computer Science Applications, CSMA/CA, Control and Systems Engineering, TDMA, Channel access method, 020201 artificial intelligence & image processing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Wireless sensor network, Carrier sense multiple access with collision avoidance, Information Systems, Computer network
Abstract

International audience; Wireless networks have become a very attractive solution for soft real-time data transport in the industry. For such technologies to carry real-time traffic, reliable bounds on end-to-end communication delays have to be ascertained to warrant a proper system behavior. As for legacy wired embedded and real-time networks, two main wireless multiple access methods can be leveraged: one is time division multiple access (TDMA), which follows a time-triggered paradigm, and the other is carrier sense multiple access with collision avoidance (CSMA/CA), which follows an event-triggered paradigm. This paper proposes an analytical comparison of the time behavior of two representative TDMA and CSMA/CA protocols in terms of the worst-case end-to-end delay. This worst-case delay is expressed in a probabilistic manner because our analytical framework captures the versatility of the wireless medium. Analytical delay bounds are obtained from delay distributions, which are compared to fine-grained simulation results. Exhibited study cases show that TDMA can offer smaller or larger worst-case bounds than CSMA/CA depending on its settings.

Published
2017

128. Data Freshness Aware Content-Centric Networking in WSNs

Author

Ghada Jaber, Rahim Kacimi, Thierry Gayraud, Temps Réel dans les Réseaux et Systèmes (IRIT-T2RS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], interest, Computer science, Distributed computing, Système d'exploitation, Data freshness, Réseaux et télécommunications, 02 engineering and technology, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Mobile wireless sensor network, Redundancy (engineering), business.industry, Internet research, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Content object, 020206 networking & telecommunications, Data lifetime, Systèmes embarqués, Wireless sensor networks, Key distribution in wireless sensor networks, Content centric networking, 020201 artificial intelligence & image processing, The Internet, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Wireless sensor network, Content-centric networking, Computer network
Abstract

International audience; The Content-Centric Networking (CCN) concept is a significant approach of several future Internet research activities. CCN in Wireless Sensor Networks present a promised technique that may ensure data routing based on content. In this paper, we focus on the lifetime of the Content Object exchanged in the network and we explain the idea of its integration in CCN for WSNs to better highlight the relevance of its exploitation. To this end, we implement DFCCN-WSNs 'Data Freshness aware Content-Centric Networking in Wireless Sensor Networks' a protocol that implements the data lifetime. Through extensive simulations, we demonstrate that DFCCN-WSNs outperforms traditional CCN in terms of end-to-end delay.

Published
2017

129. A stack cross-layer analytical model for CSMA/CA IEEE 802.15.4 networks

Author

Daniela Dragomirescu, Georges Da Costa, Zongyi Liu, Thierry Monteil, Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Équipe MIcro et Nanosystèmes pour les Communications sans fil (LAAS-MINC), Laboratoire d'analyse et d'architecture des systèmes (LAAS), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse 1 Capitole (UT1), Université Toulouse III - Paul Sabatier (UT3), Équipe Services et Architectures pour Réseaux Avancés (LAAS-SARA), Université Toulouse Capitole (UT Capitole), Université Fédérale Toulouse Midi-Pyrénées-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse Capitole (UT Capitole), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut de Recherche en Informatique de Toulouse - IRIT (Toulouse, France), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT)-Toulouse Mind & Brain Institut (TMBI), Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Université de Toulouse (UT)-Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], IEEE 802.15.4, Cross-layer model, Computer science, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Electronic engineering, Wireless, Network performance, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, IEEE 802.15, Multivariate parameters, business.industry, Wireless network, Quality of service, 020208 electrical & electronic engineering, Physical layer, 020206 networking & telecommunications, Transmitter power output, Systèmes embarqués, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, Wireless sensor network, Carrier sense multiple access with collision avoidance, Communication channel
Abstract

International audience; Because of the specifications in low-cost, low-power IEEE 802.15.4 wireless sensor networks, comprehensive analytical model is important for evaluating performance under varying wireless channel constraints. The systematic properties of single physical layer and medium access control (MAC) layer protocol have been studied through the techniques based on mathematical models or experiment-based approaches. However, It is insufficient to evaluate network performance on the basis of existing single layer model or cross-layer model with stationary parameters, especially for the multi-variable parameters-based wireless network environment. In this paper, we propose an enhanced stack cross-layer analytical model based on the comprehensive combination and interaction between PHY layer propagation model and MAC layer Markov chain model. Dynamic interaction between sublayer models achieve adaptive performance estimation with hyperparameters sets. Cross-layer performance degradation is analyzed under the varying inputs of multi-parameters vectors, several Quality of Service (QoS) metrics and effective energy consumption metric are proposed and evaluated, respectively. From the simulation results compared with benchmark models, stack cross-layer model offers more comprehensive performance analysis with different cross-layer parameters sets which include distance, transmit power, noise power, and information loads, etc.

Published
2017

130. Crowdsensing Mobile Content and Context Data: Lessons Learned in the Wild

Author

Vlad Nitu, Tao Peng, Gentian Jakllari, Katia Jaffrès-Runser, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), Système d’exploitation, systèmes répartis, de l’intergiciel à l’architecture (IRIT-SEPIA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, media_common.quotation_subject, Mobile computing, Système d'exploitation, Réseaux et télécommunications, Context (language use), Servers, 02 engineering and technology, Context data, Mobile communication, World Wide Web, Smart phones, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Server, 0202 electrical engineering, electronic engineering, information engineering, Mobile search, Quality (business), Wireless fidelity, media_common, business.industry, Sensors, Sampling (statistics), 020206 networking & telecommunications, 020207 software engineering, Systèmes embarqués, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Mobile telephony, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business
Abstract

International audience; This paper discusses the design and development efforts made to collect data using an opportunistic crowdsensing mobile application. Relevant issues are underlined, and solutions proposed within the CHIST-ERA Macaco project for the specifics of collecting fine-grained content and context data are highlighted. Global statistics on the data gathered for over a year of collection show its quality: Macaco data provides a longterm and fine-grained sampling of the user behavior and network usage that is relevant to model and analyse for future content and context-aware networking developments.

Published
2017

131. How to leverage reflection in case of inquiry learning? The study of awareness tools in the context of virtual and remote laboratory

Author

Philippe Vidal, Julien Broisin, Rémi Venant, Institut de recherche en informatique de Toulouse ( IRIT ), Institut National Polytechnique [Toulouse] ( INP ) -Université Toulouse 1 Capitole ( UT1 ) -Université Toulouse - Jean Jaurès ( UT2J ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS ), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), DAS-EEAE, Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
0301 basic medicine, Awareness tool, Computer science, Process (engineering), [SHS.EDU]Humanities and Social Sciences/Education, [ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], Système d'exploitation, Réseaux et télécommunications, Context (language use), Reflection, 03 medical and health sciences, Leverage (negotiation), Architectures Matérielles, Human–computer interaction, [INFO]Computer Science [cs], Virtual and remote laboratory, [ INFO.INFO-ES ] Computer Science [cs]/Embedded Systems, Set (psychology), Remote laboratory, business.industry, 4. Education, 05 social sciences, 050301 education, Timeline, Usability, Systèmes embarqués, 030104 developmental biology, Critical thinking, [ INFO.INFO-OS ] Computer Science [cs]/Operating Systems [cs.OS], [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, [ INFO.INFO-AR ] Computer Science [cs]/Hardware Architecture [cs.AR], business, 0503 education
Abstract

International audience; In this paper we design a set of awareness and reflection tools aiming at engaging learners in the deep learning process during a practical activity carried out through a virtual and remote laboratory. These tools include: (i) a social awareness tool revealing to learners their current and general levels of performance, but also enabling the comparison between their own and their peers’ performance; (ii) a reflection-on-action tool, implemented as timelines, allowing learners to deeply analyze both their own completed work and the tasks achieved by peers; (iii) a reflection-in-action tool acting as a live video player to let users easily see what others are doing. An experimentation involving 80 students was conducted in an authentic learning setting about operating system administration; the participants evaluated the system only slightly higher than traditional computational environments when it comes to leverage reflection and critical thinking, even if they evaluated the system as good in terms of usability.

Published
2017

132. Real-time monitoring of elderly using their connected walking stick

Author

Abdelfetteh Lachtar, Abdennaceur Kachouri, Thierry Val, Laboratoire d'électronique et des technologies de l'Information [Sfax] (LETI), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université de Sfax (TUNISIA), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Walking stick, Engineering, IoT, Monitoring, 0206 medical engineering, Acceleration, Gravity, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, CANet, Accelerometer, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Computer vision, Assistive device, Simulation, 020203 distributed computing, Leg weakness, business.industry, WiNo, 020601 biomedical engineering, Thresholding, Systèmes embarqués, Magnetometer, Senior citizens, Term (time), Three-dimensional displays, M-Health, Legged locomotion, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Artificial intelligence, False positive rate, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Accelerometers, business
Abstract

International audience; Lots of aging people rely on a cane as a help device to ovoid many problems, such as balance loss and leg weakness, presumed to be at the origin of many fall incidents. In this paper, we present a new design and implementation of Canne3D system, a local monitoring system for elderly using their connected walking stick. Actually, the 3Dcane is modeled through consideration of real-time movements for a thorough understanding of the concerned person's state, including fall detection, steps counting and calculating the distance traveled. We have applied a multi-stage thresholding framework based on the acceleration value. Experiments have revealed that step-detection algorithm appears to be robust in term of detection rate and false positive rate.

Published
2017

133. Trust management for public key infrastructures: implementing the X.509 trust broker

Author

Romain Laborde, Ahmad Samer Wazan, David W. Chadwick, Francois Barrere, Abdelmalek Benzekri, Mustafa Kaiiali, Adib Habbal, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), University of Kent (UNITED KINGDOM), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Universiti Utara Malaysia - UUM (MALAYSIA), Institut National Polytechnique de Toulouse - INPT (FRANCE), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, University of Kent [Canterbury], Université Toulouse III - Paul Sabatier (UT3), Queen's University [Belfast] (QUB), and Universiti Utara Malaysia (UUM)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], QA75, Article Subject, Computer Networks and Communications, Computer science, Internet privacy, Système d'exploitation, Trust Broker, Réseaux et télécommunications, 02 engineering and technology, Computer security, computer.software_genre, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Web of trust, Architectures Matérielles, Certificate authority, lcsh:Technology (General), 0202 electrical engineering, electronic engineering, information engineering, Trust management (information system), lcsh:Science (General), QA76.76, business.industry, 020206 networking & telecommunications, Trusted third party, Chain of trust, Systèmes embarqués, Certification Practice Statement, Trust anchor, lcsh:T1-995, 020201 artificial intelligence & image processing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Computational trust, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], business, computer, Information Systems, lcsh:Q1-390
Abstract

A Public Key Infrastructure (PKI) is considered one of the most important techniques used to propagate trust in authentication over the Internet. This technology is based on a trust model defined by the original X.509 (1988) standard and is composed of three entities: the Certification Authority (CA), the certificate holder (or subject) and the Relying Party (RP). The CA plays the role of a trusted third party between the certificate holder and the RP. In many use cases, this trust model has worked successfully. However on the Internet, PKI technology is currently facing many obstacles that slow down its global adoption. In this paper, we argue that most of these obstacles boil down to one problem, which is the trust issue, i.e. how can an RP trust an unknown CA over the Internet? We demonstrate that the original X.509 trust model is not appropriate for the Internet and must be extended to include a new entity, called the Trust Broker, which helps RPs make trust decisions about CAs. We present an approach to assess the quality of a certificate that is related to the quality of the CA’s policy and its commitment to it. The Trust Broker, which is proposed for inclusion in the 2016 edition of X.509, could follow this approach to give RPs trust information about CAs. Finally, we present a prototype Trust Broker that demonstrates how RPs can make informed decisions about certificates in the context of the Web, by using its services.

Published
2017

134. La ruée vers l'or rose : regards croisés sur la pêche crevettière traditionnelle à Madagascar

Author

Katherine Savard, Goedefroit, S. (ed.), Chaboud, Christian (ed.), and Breton, Y. (ed.)

Subjects
SYSTEME D'EXPLOITATION, système matrimonial, économie des pêches, foncier coutumier, TRAVAILLEUR MIGRANT, marché local, PECHEUR, SPECIALISATION, DIVISION DU TRAVAIL, RELATIONS AUTOCHTONES ALLOCHTONES, développement économique, INDUSTRIE, EXPORTATION, Economics (General), PECHE DE CRUSTACES, VARIATION SPATIALE, pêche, crevette, société traditionnelle, Sociology & Anthropology, SOC026000, JHB
Abstract

La collecte sur la côte ouest a connu d’importantes transformations causées entre autres par le développement des réseaux d’exportation. Elles se manifestent notamment par l’implantation de sociétés de collecte et par des effets induits dans l’activité de pêche tels que le recours à une main-d’œuvre migrante et l’introduction de nouveaux engins et de nouvelles normes de qualité. Partant de brèves descriptions de la situation qui prévaut dans le Menabe et dans la région de Mahajanga, nous mont...

Published
2017

135. A Hybrid Ant-Genetic Algorithm to Solve a Real Deployment Problem: A Case Study with Experimental Validation

Author

Adrien van den Bossche, Nejah Nasri, Thierry Val, Sami Mnasri, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Université de Sfax (TUNISIA), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Laboratoire d'électronique et des technologies de l'Information [Sfax] (LETI), École Nationale d'Ingénieurs de Sfax | National School of Engineers of Sfax (ENIS), Université Toulouse - Jean Jaurès (UT2J), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Mathematical optimization, Computer science, 3D indoor redeployment, Système d'exploitation, NSGA-III, Réseaux et télécommunications, 02 engineering and technology, Set (abstract data type), [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Genetic algorithm, 0202 electrical engineering, electronic engineering, information engineering, ACO, Ideal (set theory), Ant colony optimization algorithms, Testbed, 020206 networking & telecommunications, Prototyping, Systèmes embarqués, Hybrid algorithm, Software deployment, DL-IoT, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, 020201 artificial intelligence & image processing, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Wireless sensor network
Abstract

International audience; In this paper, we investigate the problem of deploying 3D nodes in a wireless sensor network. The aim is to choose the ideal 3D locations to add new nodes to an initial configuration of nodes, while optimizing a set of objectives. In this regard, our study proposes a new hybrid algorithm which stems from the ant foraging behavior and the genetics. It is based on a recent variant of the genetic algorithms (NSGA-III) and the Ant Colony Optimization algorithm. The obtained numerical results and the simulations compared with experiments prove the effectiveness of the proposed approach.

Published
2017

136. Thrifty-malloc : un gestionnaire dynamique de mémoire pour systèmes embarqués multicoeurs avec mémoire transactionnelle matérielle

Author

Thomas Carle, Dimitra Papagiannopoulou, Tali Moreshet, Andrea Marongiu, Maurice Herlihy, Iris Bahar, Brown University (USA), Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Università di Bologna (ITALY), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Boston University (USA), Institut National Polytechnique de Toulouse - INPT (FRANCE), Groupe de Recherche en Architecture et Compilation pour les systèmes embarqués (IRIT-TRACES), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Brown University, Boston University [Boston] (BU), and Alma Mater Studiorum Università di Bologna [Bologna] (UNIBO)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Système d'exploitation, Réseaux et télécommunications, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, Gestionnaire de mémoire dynamique, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Systèmes embarqués
Abstract

International audience; Cet article présente thrifty-malloc : un gestionnaire de mémoire dynamique compatible avec la mémoire transactionnelle matérielle, pour les systèmes embarqués multi-coeurs. Ce gestion-naire combine modularité, facilité d’utilisation et compatibilité avec la mémoire transaction-nelle matérielle (HTM) dans un design léger et peu gourmand en mémoire. Thrifty-malloc est facile à déployer et à configurer pour des programmeurs non-experts. Il délivre de bonnes per-formances avec un faible surcoût en mémoire, pour des applications embarquées exhibant un niveau élevé de parallélisme exécutées sur des architectures many-coeurs. De plus, les méca-nismes transparents qui permettent d’augmenter la résilience de ce gestionnaire aux situations dynamiques imprédictibles n’induisent qu’un faible surcoût temporel.

Published
2017

137. Mieux coupler cultures et élevage dans les exploitations d'herbivores conventionnelles et biologiques : une voie d'amélioration de leur durabilité ?

Author

Martel, Gilles, Guilbert, C., Veysset, Patrick, Dieulot, Romain, Durant, Daphné, and Mischler, Pierre

Subjects
performance économique, agriculture biologique, aspect économique, autonomie, bovin, caprin, céréales, diagnostic, enquête, environnement, exploitation agricole, ovin, pesticide, polyculture-élevage, prairie, système d'exploitation, cattle, crop system, diagnosis, economic aspect, environment, farm, fertilisation, goats, grassland, mixed crop-livestock system, organic farming, self-sufficiency, sheep, survey, élevage biologique, élevage conventionnel, polyculture élevage, herbivore, pratique culturale, enquête auprès des éleveurs, Sciences agricoles, couplage, performance environnementale, Agricultural sciences
Abstract

Les Systèmes de PolyCulture Elevage (SPCE), qu'ils soient conventionnels ou en agriculture biologique, ont des atouts théoriques pour faciliter la gestion durable des agroécosystèmes par l'agriculture et ainsi réduire les externalités négatives. Dans la pratique, il y a une large diversité de façons de pratiquer la polyculture-élevage. L'objectif de cette étude est de caractériser le couplage entre cultures et élevage dans les exploitations - c'est-à-dire, l'intensité des échanges entre ateliers animaux et ateliers cultures - et de tester ce critère vis-à-vis des performances économiques et environnementales des exploitations. Pour caractériser le couplage, nous avons utilisé 10 critères issus de la bibliographie et adaptés aux données disponibles des trois bases mobilisées (Réseau CIVAM, INOSYS et INRA), réalisé une ACP sur 1 190 fermes (détenant des ruminants), puis caractérisé les axes les plus significatifs en rapport avec le couplage entre cultures et élevage. La position des fermes sur ces axes nous a servi à calculer un score de couplage pour chacune d'elle. Les fermes ont alors été réparties au sein de trois classes (peu, moyennement et fortement couplées). Les performances des fermes en fonction du niveau de couplage ont été évaluées au moyen de 3 critères économiques et de 4 critères environnementaux. Nous obtenons 357 fermes peu couplées (score < -2,76), 476 fermes moyennement couplées (score entre -2,76 et +2,14) et 357 fermes fortement couplées (score >2,14). Les fermes en agriculture biologique sont en moyenne plus fortement couplées que les fermes conventionnelles. Les exploitations avec un niveau de couplage élevé ont de meilleures performances environnementales que celles ayant un niveau de couplage plus faible, quelle que soit la filière animale. Les performances économiques sont plus nuancées. Les charges opérationnelles sont diminuées avec un couplage croissant, et l'efficacité économique est améliorée. Le résultat courant par unité de main d'œuvre exploitant reste stable quel que soit le niveau de couplage. Les systèmes biologiques ont été comparés aux systèmes conventionnels à couplage équivalent. Ils ont des performances environnementales et économiques supérieures indiquant que les effets du couplage et du passage en agriculture biologique sont additifs. Le couplage, encouragé par le cahier des charges AB, semble impliquer des mécanismes améliorant la durabilité des exploitations d'herbivores., Mixed crop-livestock systems are highly diverse, especially in their ways of coupling crop and livestock. Here, to characterise this diversity, we used 10 criteria adapted to data from 3 databases. A PCA was carried out using information on 1,190 farms. A couplage score, reflecting the degree of couplage, was calculated for each farm and was then related to farm economic and environmental performance. On average, organic farms had higher degrees of couplage than did conventional farms. Farms with greater couplage displayed better environmental performance and greater economic efficiency (thanks to lower operating expenses). However, operating revenue per farm labour unit was independent of the couplage score. The degree of couplage and transition to organic farming had additive effects.

Published
2017

138. Using sequential pattern mining to explore learners' behaviors and evaluate their correlation with performance in inquiry-based learning

Author

Rémi Venant, Julien Broisin, Philippe Vidal, Kshitij Sharma, Pierre Dillenbourg, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole Polytechnique Fédérale de Lausanne - EPFL (SWITZERLAND), Institut National Polytechnique de Toulouse - INPT (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Computer-Human Interaction in Learning and Instruction (CHILI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), DAS-EEAE, and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
Reflection (computer programming), Computer science, [SHS.EDU]Humanities and Social Sciences/Education, Learning analytics, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, [INFO.INFO-LG]Computer Science [cs]/Machine Learning [cs.LG], Architectures Matérielles, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_COMPUTERSANDEDUCATION, [INFO]Computer Science [cs], Remote laboratory, Abstraction (linguistics), 4. Education, 05 social sciences, 050301 education, Data science, Systèmes embarqués, Test (assessment), Visualization, Action (philosophy), Inquiry-based learning, [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, 0503 education
Abstract

International audience; This study analyzes students’ behaviors in a remote laboratory environment in order to identify new factors of prediction of academic success. It investigates relations between learners’ activities during practical sessions, and their performance at the final assessment test. Based on learning analytics applied to data collected from an experimentation conducted with our remote lab dedicated to computer education, we discover recurrent sequential patterns of actions that lead us to the definition of learning strategies as indicators of higher level of abstraction. Results show that some of the strategies are correlated to learners’ performance. For instance, the construction of a complex action step by step, or the reflection before submitting an action, are two strategies applied more often by learners of a higher level of performance than by other students. While our proposals are domain-independent and can thus apply to other learning contexts, the results of this study led us to instrument for both students and instructors new visualization and guiding tools in our remote lab environment.

Published
2017

139. Rural societies in the face of climatic and environmental changes in West Africa

Author

Lalou, Richard, Delaunay, Valérie, Sultan, Benjamin (ed.), Lalou, Richard (ed.), Amadou Sanni, M. (ed.), Oumarou, A. (ed.), and Soumaré, M.A. (ed.)

Subjects
SYSTEME D'EXPLOITATION, SECURITE ALIMENTAIRE, CLIMAT, PRECIPITATION, CHANGEMENT CLIMATIQUE, PRODUCTION AGRICOLE, CEREALE, IMPACT SOCIOECONOMIQUE, ADAPTATION, MIGRATION RURALE, MIGRATION TEMPORAIRE, EVOLUTION, IMPACT SUR L'ENVIRONNEMENT
Published
2017

140. The Sticking Heartbeat Aperture Resynchronization Protocol

Author

Katia Jaffrès-Runser, Santiago Gonzalez, Tracy Camp, Centre National de la Recherche Scientifique - CNRS (FRANCE), Colorado School of Mines (USA), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), University of Texas at Austin (USA), Institut de Recherche en Informatique de Toulouse - IRIT (Toulouse, France), Institut National Polytechnique de Toulouse - INPT (FRANCE), University of Texas at Austin [Austin], Colorado School of Mines, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, and Institut National Polytechnique (Toulouse) (Toulouse INP)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Heartbeat, Computer science, Real-time computing, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, Broadcasting, Synchronization, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Synchronization (computer science), 0202 electrical engineering, electronic engineering, information engineering, Wireless, Data synchronization, Network protocols, Protocol (object-oriented programming), SIMPLE (military communications protocol), business.industry, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Time synchronization, 020206 networking & telecommunications, Systèmes embarqués, Wireless sensor networks, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Communications protocol, business, Wireless sensor network
Abstract

International audience; As wireless sensor networks become more ubiquitous in the world, the need for lightweight, resilient time synchronization protocols is apparent. Wireless nodes’ internal clocks are subject to drift over time due to manufacturing imperfections and environmental changes. While various protocols have been introduced that attempt to correct for this drift, they each have their own peculiarities and issues. This paper presents a new protocol, the Sticking Heartbeat Aperture Resynchronization Protocol (SHARP), that reduces synchronization error and resolves shortcomings of existing protocols. We have implemented and compared SHARP to two existing (and noteworthy) time synchronization protocols, Reference Broadcast Synchronization (RBS) and Simple Synchronization Protocol (SISP), on Atmel ATMega328p based microcontroller platforms with IEEE 802.15.4 Xbee radio modules. We show that SHARP exhibits a higher level of synchronization than SISP (which in turn exhibited much better performance than RBS), while requiring significantly fewer messages.

Published
2017

141. Lab4CE: a Remote Laboratory for Computer Education

Author

Julien Broisin, Rémi Venant, Philippe Vidal, Service IntEgration and netwoRk Administration (IRIT-SIERA), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse III - Paul Sabatier (UT3), Teaching And Learning Enhanced by Technologies (IRIT-TALENT), DAS-EEAE, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Computer science, Exploratory research, Système d'exploitation, Réseaux et télécommunications, Remote laboratory, 02 engineering and technology, Academic achievement, computer.software_genre, Education, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 020204 information systems, 0202 electrical engineering, electronic engineering, information engineering, ComputingMilieux_COMPUTERSANDEDUCATION, Online learning environment, Set (psychology), Research question, Multimedia, 4. Education, 05 social sciences, Educational technology, 050301 education, Virtualization, Popularity, Systèmes embarqués, Computational Theory and Mathematics, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], 0503 education, computer
Abstract

International audience; Remote practical activities have been demonstrated to be efficient when learners come to acquire inquiry skills. In computer science education, virtualization technologies are gaining popularity as this technological advance enables instructors to implement realistic practical learning activities, and learners to engage in authentic and problem-based learning. However, virtualization solutions have not been designed especially for education and do not address any pedagogical concern. Since several large-scale studies showed that instructional supports during practical activities are almost as important as technical features, this article investigates the following research question: how the scaffolding around the lab increases students’ engagement in remote practical learning of computer science? To answer this question, we introduce the Lab4CE environment, a remote laboratory for computer education which adopts a distributed, modular and flexible architecture to integrate a set of scaffolding tools and services intended for instructors and learners. An exploratory study conducted with 139 undergraduate students enrolled in the first year of a computer science degree suggests a positive effect of the framework on learners’ engagement when they come to practice system administration, and reveals a significant positive correlation between students’ activity within the system and students’ learning achievement.

Published
2017

142. Synchronizing Tiny Sensors with SISP: a Convergence Study

Author

Thierry Val, Oana Hotescu, Katia Jaffrès-Runser, Adrien van den Bossche, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), and Université Toulouse - Jean Jaurès (UT2J)

Subjects
Computer science, Real-time computing, sync, Système d'exploitation, Synchronizing, Réseaux et télécommunications, 02 engineering and technology, Synchronization, Upper and lower bounds, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, Convergence analysis, Convergence (routing), 0202 electrical engineering, electronic engineering, information engineering, Wireless, Protocol (object-oriented programming), SIMPLE (military communications protocol), business.industry, 020208 electrical & electronic engineering, 020206 networking & telecommunications, Systèmes embarqués, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, business, Wireless Sensor Network, Computer network
Abstract

International audience; The SImple Synchronization Protocol (SISP) has been designed for tiny sensors to offer a wireless synchronization service to the network. SISP is completely distributed with a flat architecture. Nodes broadcast a SYNC message periodically that contains the value of their view of a shared clock counter. Every time a SYNC message is received, nodes update their shared clock by averaging it with the clock value embedded in the message. This protocol converges in practice very well, and requires a small amount of energy as SYNC messages can be sent every second only. Moreover, computations are basic, perfectly fitting the tiny sensor platforms needed for the Internet of Things. Its distributed operations enable the network to adjust seamlessly to the appearance or disappearance of other nodes. This paper concentrates on the convergence analysis of this promising protocol. Convergence time and synchronization accuracy are determined analytically, by simulations and by experimenting a real sensor platform. All results show that this protocol offers an accuracy in the order of a few tens of microseconds. Moreover, our analytical derivations capture very well an upper bound on the synchronization accuracy.

Published
2017

143. Dealing with performance unpredictability in an asymmetric multicore processor cloud

Author

Daniel Hagimont, Boris Teabe, Alain-Bouzaïde Tchana, Patrick Lavoisier Wapet, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
Computer science, Distributed computing, Système d'exploitation, Réseaux et télécommunications, Cloud computing, 02 engineering and technology, Cloud computing data center, computer.software_genre, 01 natural sciences, Architectures Matérielles, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Overhead (computing), Simulation, 010302 applied physics, Multi-core processor, business.industry, IaaS, 020206 networking & telecommunications, Systèmes embarqués, Core (game theory), Virtual machine, Data center, business, Resource management (computing), computer
Abstract

In a Cloud computing data center and especially in a IaaS (Infrastructure as a Service), performance predictability is one of the most important challenges. For a given allocated virtual machine (VM) in one IaaS, a client expects his application to perform identically whatever is the hosting physical server or its resource management strategy. However, performance predictability is very difficult to enforce in a heterogeneous hardware environment where machines do not have identical performance characteristics, and even more difficult when machines are internally heterogeneous as for Asymmetric Multicore Processor machines. In this paper, we introduce a VM scheduler extension which takes into account hardware performance heterogeneity of Asymmetric Multicore Processor machines in the cloud. Based on our analysis of the problem, we designed and implemented two solutions: the first weights CPU allocations according to core performance, while the second adapts CPU allocations to reach a given instruction execution rate (Ips) regardless the core types. We demonstrate that such scheduler extensions can enforce predictability with a negligible overhead on application performance.

Published
2017

144. dynSMAUG: A Dynamic Security Management Framework Driven by Situations

Author

Abdelmalek Benzekri, Arnaud Oglaza, Francois Barrere, Romain Laborde, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
Computer science, business.industry, Event based, Système d'exploitation, Réseaux et télécommunications, Group dynamic, Modular design, Computer security, computer.software_genre, Security policy, Security management, Systèmes embarqués, Software deployment, Architectures Matérielles, Global Positioning System, Cryptographie et sécurité, business, computer, Companies
Abstract

We present a dynamic security management framework where security policies are specified according to situations. A situation allows to logically group dynamic constraints and make policies closer to business. Situations are specified and calculated by using complex events processing techniques and security policies are written in XACMLv3. Finally, the framework is supported by a modular event based deployment infrastructure. The whole framework has been implemented and its performance is evaluated.

Published
2017

145. Opportunistic communications in WSN using UAV

Author

Riadh Dhaou, Simona Chisiu, Xiaoyan Ma, Rahim Kacimi, Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Temps Réel dans les Réseaux et Systèmes (IRIT-T2RS), Institut National Polytechnique (Toulouse) (Toulouse INP), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), and Université Toulouse 1 Capitole - UT1 (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], Routing protocol, Computer science, Système d'exploitation, Réseaux et télécommunications, 02 engineering and technology, Opportunistic routing protocols, Hop (networking), [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Architectures Matérielles, 0202 electrical engineering, electronic engineering, information engineering, Mobility, 020203 distributed computing, Unmanned aerialvehicles, business.industry, Network packet, ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, 020206 networking & telecommunications, Systèmes embarqués, Wireless sensor networks, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Mobile telephony, business, Wireless sensor network, Computer network
Abstract

International audience; This paper studies the opportunistic routing (OR) in unmanned aerial vehicle (UAV) assisted wireless sensor networks (WSNs). We consider the scenario where a UAV collects data from randomly deployed mobile sensors that are moving with different velocities along a predefined route. Due to the dynamic topology, mobile sensors have different opportunities to communicate with the UAV. This paper proposes the All Neighbors Opportunistic Routing (ANOR) and Highest Velocity Opportunistic Routing (HVOR) protocols. In essence, ANOR forwards packets to all neighbors and HVOR forwards them to one neighbor with highest velocity. HVOR is a new OR protocol which dynamically selects route on a pre-transmission basis in multi-hop network. HVOR helps the sensor which has little opportunity to communicate with the UAV to determine which sensor, among all the sensors that are within its range, is the forwarder. The selected node forwards the packet. As a result, in each hop, the packet moves to the sensor that has higher opportunity to communicate with the UAV. In addition, we focus on various performance metrics, including Packets Delivery Ratio (PDR), Routing Overhead Ratio (ROR), Average Latency (AL) and Average Hop Count (AHC), to evaluate the proposed algorithms and compare them with a Direct Communication (DC) protocol. Through extensive simulations, we have shown that both HVOR and ANOR algorithms work better than DC. Moreover, the HVOR algorithm outperforms the other two algorithms in terms of the average overhead.

Published
2017

146. Sytare: Persistence de l'état des périphériques pour les systèmes à alimentation intermittente

Author

Berthou, Gautier, Delizy, Tristan, Marquet, Kevin, Salagnac, Guillaume, Risset, Tanguy, Salagnac, Guillaume, Software and Cognitive radio for telecommunications (SOCRATE), Inria Grenoble - Rhône-Alpes, Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-CITI Centre of Innovation in Telecommunications and Integration of services (CITI), Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)

Subjects
périphériques matériels, gestion mémoire, [INFO.INFO-OS] Computer Science [cs]/Operating Systems [cs.OS], système embarqué, checkpointing, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], alimentation intermittente, système d'exploitation, [INFO.INFO-ES] Computer Science [cs]/Embedded Systems
Abstract

National audience; Les systèmes dits à alimentation intermittente sont de petits systèmes embarqués récupérant l'énergie dans leur environnement. À cause de contraintes de taille et de coût, ils subissent de fréquentes coupures de courant, mais sont néanmoins capables d'exécuter un programme logiciel, en sauvegardant les données nécessaires au calcul dans une mémoire non-volatile. Cet article présente une technique permettant à ces systèmes d'utiliser des périphériques non triviaux tels qu'un convertisseur analogique-numérique, une interface série ou une radio.

Published
2017

147. Prototyping of a new Multi-channel Multi-hop Access Method without RendezVous

Author

Mahamat Habib Senoussi Hissein, Adrien van den Bossche, Thierry VAL, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Université Toulouse - Jean Jaurès (UT2J), and Institut National Polytechnique de Toulouse - INPT (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS, Système d'exploitation, WiNo, Réseaux et télécommunications, Medium Access Control, Prototyping, Systèmes embarqués, Multi-hop without RDV, Wireless Sensors Networks, [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], Multi-channel medium access, Architectures Matérielles, Computer Science::Networking and Internet Architecture, Performance evaluation, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS]
Abstract

International audience; One of the most important issues for wireless LANs is the access and the share of wireless radio medium. Several single-channel MAC protocols have been proposed and address this issue with interesting solutions, but some major problems related to channel access (hidden node, synchronization, propagation of RendezVous...) still persist in a multi-hop transmission context and are still the subject of intensive studies by the scientific community, especially when it is related to extended topologies on distributed Wireless Sensors Networks. This article proposes a new multi-channel MAC for all types of multi-hop wireless network topologies, without RendezVous, its prototyping and performance analysis.

Published
2017

148. Towards Quality of Service Provision with Avionics Full Duplex Switching

Author

Hotescu, Oana Andreea, Jaffrès-Runser, Katia, Scharbarg, Jean-Luc, Fraboul, Christian, Institut National Polytechnique de Toulouse - INPT (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Réseaux, Mobiles, Embarqués, Sans fil, Satellites (IRIT-RMESS), Institut de recherche en informatique de Toulouse (IRIT), Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Institut National Polytechnique (Toulouse) (Toulouse INP), and Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)

Subjects
[INFO.INFO-AR]Computer Science [cs]/Hardware Architecture [cs.AR], [INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI], AFDX, Architectures Matérielles, Système d'exploitation, Réseaux et télécommunications, [INFO.INFO-ES]Computer Science [cs]/Embedded Systems, [INFO.INFO-OS]Computer Science [cs]/Operating Systems [cs.OS], Avionics Full-Duplex Switched Ethernet, Systèmes embarqués
Abstract

International audience; Avionics Full-Duplex Switched Ethernet (AFDX) has been designed to carry exclusively time-critical flows dictated by the severe real-time constraints of avionics. Certification methods ensure end-to-end communication delays are upper bounded at the cost of an over-provision of network bandwidth. This paper investigates the issues related to the efficient use of such wasted communication capacity. The basic idea is to push additional Ethernet flows of lower priority into the network with the goal of offering different quality of service levels to them. This addition should of course be transparent to real-time flows. Different scheduling policies, enforced at the end system and at the switches, can provide such features. This paper questions i) their impact on the real-time flow end-to-end delay and ii) the quality of service non real-time flows can expect in terms of end-to-end delay distribution. The ultimate goal of this study is to decide if such a network configuration offers the opportunity to deploy multimedia applications such as VoIP traffic, live video streaming over an AFDX industrial configuration. A first study investigates the use of static priority queuing and traffic scheduling tables on an industrial A350 AFDX configuration. Traffic scheduling tables are shown to be promising as they can spread non-critical traffic more evenly over time, reducing congestion peaks at switches. I. APPLICATION DOMAIN & CHALLENGE A. Application domain Avionics Full DupleX switching (AFDX) networks have become the de-facto technology for commercial avionics embedded networks in the last decade. AFDX follows ARINC664 Part 7 norm [1] and is currently deployed by the biggest aircraft manufacturers. A complex industrial ecosystem has been created around this technology to efficiently design, prototype and certify such networks. Even though alternative solutions are being investigated, this protocol will remain in use for couple of decades in the industry. AFDX is a switched Ethernet network where network interface cards (the so-called end systems) can only emit frames following a pre-defined virtual link (VL) setting. A VL is defined by minimum and maximum frame sizes, together with a BAG duration (Bandwidth Allocation Gap) that expresses the minimum duration that separates two consecutive frames of the VL. A given bandwidth is as such associated to a VL. BAG durations are selected within the discrete power set of {1, 2, 4, 8, 16, 32, 64, 128} milliseconds. AFDX switches are configured statically with VL routes that can be set as multicast. For each egress port, two queues with different priority levels exist. Fig. 1: Example of an A350-like AFDX network topology. Switches are given by red vertices, other nodes representing end systems. Figure 1 represents an example network similar to the ones deployed on an A350 aircraft. It is composed of 126 end systems interconnected by two redundant AFDX networks composed of 7 switches each. End systems generate 1106 VLs.

Published
2017

149. Un nouveau processus d'évaluation pour améliorer la qualité des feedbacks dans les tests en ligne

Author

Silvestre , Franck, Vidal , Philippe, Broisin , Julien, Université Toulouse 1 Capitole (UT1), Université Fédérale Toulouse Midi-Pyrénées, Teaching And Learning Enhanced by Technologies (IRIT-TALENT), Institut de recherche en informatique de Toulouse (IRIT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse - Jean Jaurès (UT2J)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Toulouse 1 Capitole (UT1), Service IntEgration and netwoRk Administration (IRIT-SIERA), Université Toulouse III - Paul Sabatier (UT3), DAS-EEAE, Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Université Toulouse - Jean Jaurès - UT2J (FRANCE), Université Toulouse 1 Capitole - UT1 (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut de recherche en informatique de Toulouse ( IRIT ), and Institut National Polytechnique [Toulouse] ( INP ) -Université Toulouse 1 Capitole ( UT1 ) -Université Toulouse - Jean Jaurès ( UT2J ) -Université Paul Sabatier - Toulouse 3 ( UPS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
[ INFO.INFO-NI ] Computer Science [cs]/Networking and Internet Architecture [cs.NI], [SHS.EDU]Humanities and Social Sciences/Education, Système d'exploitation, Réseaux et télécommunications, Instruction par les pairs, Systèmes embarqués, Feedback, Evaluation par les pairs, Tests informatisés, Architectures Matérielles, [ INFO.INFO-OS ] Computer Science [cs]/Operating Systems [cs.OS], [INFO]Computer Science [cs], [INFO.EIAH]Computer Science [cs]/Technology for Human Learning, [ INFO.INFO-AR ] Computer Science [cs]/Hardware Architecture [cs.AR], [ INFO.INFO-ES ] Computer Science [cs]/Embedded Systems, Processus en N phases, Questions interactives
Abstract

International audience; Nos travaux précédents ont introduit la plateforme Tsaap-Notes dédiée à la génération de questionnaires à choix multiples en recyclant (1) les questions interactives posées pendant le cours par l’enseignant, et (2) les explications saisies par les étudiants pour constituer les feedbacks présentés aux étudiants durant les tests. Dans cet article, nous présentons un nouveau processus baptisé « processus en N phases » et son implantation dans Tsaap-Notes qui visent d’une part à augmenter l’engagement des étudiants dans l’activité de rédaction des explications et, d’autre part à améliorer la qualité des feedbacks restitués au sein des tests générés. Notre approche a été validée par une première expérimentation.

Published
2017

150. Développement d'un système d'exploitation des entreprises pour le suivi et le contrôle des opérations

Author

Youssef, Joseph and STAR, ABES

Subjects
Distributed simulation, Operating system, Infrastructure, Modèle, Simulation distribuée, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Architecture, Enterprise interoperability, Système d'exploitation, Interopérabilité d'entreprise, Model
Abstract

Operating System (OS) is a well-known concept in computer science as an interface between human and computer hardware (MacOS, Windows, IOS, Android,…). In the perspective of developing future generation of enterprise systems based on IoT and Cyber-Physical System principles, this doctorate research proposes to develop an Enterprise Operating System (EOS); Unlike ERP, which is defined as a platform that allows the organization at the operational level to use a system of integrated applications in order to automate many back office functions related to technology and services, EOS will act as an interface between enterprise business managers and enterprise resources for real time monitoring and control of enterprise operations.The thesis presents at first the context, priorities, challenges and expected results. Then a set of requirements and functionalities of EOS is described. After that, a survey on existing relevant works is given and mapped to the specified requirements related to EOS. Afterwards, and based on the requirements and state-of-the-art results, the EOS conceptual, technical and implementation architectures are outlined including all internal and external components. The last part draws two examples in the banking and manufacturing sectors to illustrate the use of the EOS., Le système d'exploitation (OS) est un concept bien connu en informatique comme interface entre l'Homme et le matériel informatique (MacOS, Windows, IOS, Android, ...). Dans le but de développer la future génération de systèmes d'entreprise basés sur les principes de l'IoT et du Cyber-Physique, cette thèse propose de développer un système d'exploitation d'entreprise « System d’Exploitation des Entreprises » (EOS); Contrairement à ERP, qui est défini comme un programme qui permet à l'organisation au niveau opérationnel d'utiliser un système d'applications intégrées afin d'automatiser de nombreuses fonctions liées à la technologie et aux services, EOS servira d'interface entre les gestionnaires d'entreprise et les ressources d'entreprise pour le suivi en temps réel et le contrôle des opérations.Nous présenterons d'abord le contexte, les priorités, les défis et les résultats escomptés. Ensuite, un ensemble d'exigences et de fonctionnalités d'EOS est décrit. Après, un état de l’art existant sur les travaux pertinents est donné et mis en correspondance avec les exigences spécifiées liées à EOS. Par la suite, et en fonction des exigences et des résultats, les architectures conceptuelle, technique et d’implantation sont décrites, y compris tous les composants internes et externes. La dernière partie présenteront deux exemples dans les secteurs bancaire et manufacturier pour illustrer l'utilisation de l'EOS.

Published
2017

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