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412 results on '"Tirado, Francisco"'

1. Energy efficiency optimization of task-parallel codes on asymmetric architectures

Author

Costero, Luis, Igual, Francisco D., Olcoz, Katzalin, and Tirado, Francisco

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

We present a family of policies that, integrated within a runtime task scheduler (Nanox), pursue the goal of improving the energy efficiency of task-parallel executions with no intervention from the programmer. The proposed policies tackle the problem by modifying the core operating frequency via DVFS mechanisms, or by enabling/disabling the mapping of tasks to specific cores at selected execution points, depending on the internal status of the scheduler. Experimental results on an asymmetric SoC (Exynos 5422) and for a specific operation (Cholesky factorization) reveal gains up to 29% in terms of energy efficiency and considerable reductions in average power.

Published
2024
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2. Leveraging knowledge-as-a-service (KaaS) for QoS-aware resource management in multi-user video transcoding

Author

Costero, Luis, Igual, Francisco D., Olcoz, Katzalin, and Tirado, Francisco

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

The coexistence of parallel applications in shared computing nodes, each one featuring different Quality of Service (QoS) requirements, carries out new challenges to improve resource occupation while keeping acceptable rates in terms of QoS. As more application-specific and system-wide metrics are included as QoS dimensions, or under situations in which resource-usage limits are strict, building and serving the most appropriate set of actions (application control knobs and system resource assignment) to concurrent applications in an automatic and optimal fashion becomes mandatory. In this paper, we propose strategies to build and serve this type of knowledge to concurrent applications by leveraging Reinforcement Learning techniques. Taking multi-user video transcoding as a driving example, our experimental results reveal an excellent adaptation of resource and knob management to heterogeneous QoS requests, and increases in the amount of concurrently served users up to 1.24x compared with alternative approaches considering homogeneous QoS requests.

Published
2024
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3. Optimization of a Line Detection Algorithm for Autonomous Vehicles on a RISC-V with Accelerator

Author

Belda, María José, Olcoz, Katzalin, Castro, Fernando, and Tirado, Francisco

Subjects
Computer Science - Hardware Architecture
Abstract

In recent years, autonomous vehicles have attracted the attention of many research groups, both in academia and business, including researchers from leading companies such as Google, Uber and Tesla. This type of vehicles are equipped with systems that are subject to very strict requirements, essentially aimed at performing safe operations -- both for potential passengers and pedestrians -- as well as carrying out the processing needed for decision making in real time. In many instances, general-purpose processors alone cannot ensure that these safety, reliability and real-time requirements are met, so it is common to implement heterogeneous systems by including accelerators. This paper explores the acceleration of a line detection application in the autonomous car environment using a heterogeneous system consisting of a general-purpose RISC-V core and a domain-specific accelerator. In particular, the application is analyzed to identify the most computationally intensive parts of the code and it is adapted accordingly for more efficient processing. Furthermore, the code is executed on the aforementioned hardware platform to verify that the execution effectively meets the existing requirements in autonomous vehicles, experiencing a 3.7x speedup with respect to running without accelerator.

Published
2024
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6. La norma digital y la extitución. El caso de la Tele-Asistencia Domiciliaria

Author

López Gómez, Daniel and Tirado, Francisco Javier

Subjects
Institutions, Extitutions, Power, Telehomecare, History of scholarship and learning. The humanities, AZ20-999, Social sciences (General), H1-99
Abstract

The deinstitutionalization of society is in part associated with the growing implementation of new information and communication technologies. These new technologies bring about new collective formations. if the social sciences are succesfully to understand the impact of these technologies, we will need new ways of thinking about institutions and power. We shall take the case of telephone helplines as a test-bed for Foucault's proposals for understanding institutions' operation of power. Specifically, we use the Foucaultian notion that space, body and norms are constitutive elements of the corporeality of institutions. We report how this applies to the case of telephone helplines, and we claim that Foucault's concepts do not go far enough. Instead, we propose the new concept of 'extitution'. Extuition helps understand new anatomies of power anatomy and new kinds of social practices.

Published
2004

8. Performance Portability Assessment: Non-negative Matrix Factorization as a Case Study

Author

Faqir-Rhazoui, Youssef, García, Carlos, Tirado, Francisco, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Singer, Jeremy, editor, Elkhatib, Yehia, editor, Blanco Heras, Dora, editor, Diehl, Patrick, editor, Brown, Nick, editor, and Ilic, Aleksandar, editor

Published
2023
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22. Cached geometry manager for view-dependent LOD rendering

Author

Lario, Roberto, Pajarola, Renato, and Tirado, Francisco

Abstract

The new generation of commodity graphics cards with significant on-board video memory has become widely popular and provides high-performance rendering and flexibility. One of the features to be exploited is the use of the on-board video memory to store geometry information. This strategy significantly reduces the data transfer overhead from sending geometry data over the (AGP) bus interface from main memory to the graphics card. However, taking advantage of cached geometry is not a trivial task because the data models often exceed the memory size of the graphics card. In this paper we present a dynamic cached geometry manager (CGM) to address this issue. We show how this technique improves the performance of real-time view-dependent level-of-detail (LOD) selection and rendering algorithms of large data sets. Our approach has been analyzed over two view-dependent progressive mesh (VDPM) frameworks: one for rendering of arbitrary manifold 3D meshes, and one for terrain visualization.

Published
2004

29. On-Line Multi-Threaded Processing of Web User-Clicks on Multi-Core Processors

Author

Bonacic, Carolina, Garcia, Carlos, Marin, Mauricio, Prieto, Manuel, Tirado, Francisco, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Palma, José M. Laginha M., editor, Daydé, Michel, editor, Marques, Osni, editor, and Lopes, João Correia, editor

Published
2011
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30. Contact pathway in surgical and transcatheter aortic valve replacement

Author

de la Morena-Barrio, María Eugenia, primary, Corral, Javier, additional, López-García, Cecilia, additional, Jiménez-Díaz, Víctor Alonso, additional, Miñano, Antonia, additional, Juan-Salvadores, Pablo, additional, Esteve-Pastor, María Asunción, additional, Baz-Alonso, José Antonio, additional, Rubio, Ana María, additional, Sarabia-Tirado, Francisco, additional, García-Navarro, Miguel, additional, García-Lara, Juan, additional, Marín, Francisco, additional, Vicente, Vicente, additional, Pinar, Eduardo, additional, Cánovas, Sergio José, additional, and de la Morena, Gonzalo, additional

Published
2022
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33. Improving Search Engines Performance on Multithreading Processors

Author

Bonacic, Carolina, Garcia, Carlos, Marin, Mauricio, Prieto, Manuel, Tirado, Francisco, Vicente, Cesar, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Palma, José M. Laginha M., editor, Amestoy, Patrick R., editor, Daydé, Michel, editor, Mattoso, Marta, editor, and Lopes, João Correia, editor

Published
2008
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34. Exploiting Hybrid Parallelism in Web Search Engines

Author

Bonacic, Carolina, Garcia, Carlos, Marin, Mauricio, Prieto, Manuel, Tirado, Francisco, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Luque, Emilio, editor, Margalef, Tomàs, editor, and Benítez, Domingo, editor

Published
2008
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35. Enhancing the Performance of Multigrid Smoothers in Simultaneous Multithreading Architectures

Author

García, Carlos, Prieto, Manuel, Setoain, Javier, Tirado, Francisco, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Rangan, C. Pandu, editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Daydé, Michel, editor, Palma, José M. L. M., editor, Coutinho, Álvaro L. G. A., editor, Pacitti, Esther, editor, and Lopes, João Correia, editor

Published
2007
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36. Biopolitics and speculative objects in Chilean health projects.

Author

Castillo-Sepúlveda, Jorge, Tirado, Francisco, and Gálvez, Ana

Subjects
*PUBLIC health, *SPECULATION
Abstract

'Biopolitics' is a much-used concept in recent academic literature. One of its main fields of application is in the analysis of public health projects. This article analyses the national Explicit Health Guarantees project in Chile from that perspective. However, we criticize the standard invocation of 'biopolitics' by observing that such public health projects require technoscientific operations that establish truths and regimes of obligation for the groups involved -understanding regime both as a set of imposed orders and a set of regulated processes. Specifically, the Explicit Health Guarantees project defines what we call 'speculative objects'. These have two characteristics: (a) They relate highly diverse entities into integrated wholes that are and involve objects of knowledge and uncertainty, and (b) this integration creates regimes of obligation considered as scientific truths on many different groups. We conclude by proposing new questions about the notion of biopolitics and its relationship with uncertainty and speculation. [ABSTRACT FROM AUTHOR]

Published
2023
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38. Energy Characterization of Garbage Collectors for Dynamic Applications on Embedded Systems

Author

Velasco, Jose M., Atienza, David, Olcoz, Katzalin, Catthoor, Francky, Tirado, Francisco, Mendias, J. M., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Paliouras, Vassilis, editor, Vounckx, Johan, editor, and Verkest, Diederik, editor

Published
2005
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39. A Power-Efficient and Scalable Load-Store Queue Design

Author

Castro, Fernando, Chaver, Daniel, Pinuel, Luis, Prieto, Manuel, Huang, Michael C., Tirado, Francisco, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Paliouras, Vassilis, editor, Vounckx, Johan, editor, and Verkest, Diederik, editor

Published
2005
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41. Adaptive Tuning of Reserved Space in an Appel Collector

Author

Velasco, José Manuel, Olcoz, Katzalin, Tirado, Francisco, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, and Odersky, Martin, editor

Published
2004
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44. PO-05-125 BODY MASS INDEX AS A DETERMINANT OF SCAR FORMATION POST-AF ABLATION: INSIGHTS FROM THE DECAAF II STUDY

Author

Bidaoui, Ghassan, Younes, Hadi, Jia, Yishi, Assaf, Ala, Chouman, Nour, Chamoun, Nadia, Bsoul, Mayana, Tirado, Francisco, Huang, Chao, Feng, Han, Liu, Yingshuo, Lim, Chanho, McGarvey, Cecile, Tsakiris, Eli, Dahl, Alexander, Lunn, Emma, Noujaim, Charbel, Mekhael, Mario, Pandey, Amitabh C., Rao, Swati, Kreidieh, Omar, Marrouche, Nassir F., and Donnellan, Eoin

Published
2024
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45. PO-05-126 SUSTAINED ATRIAL FIBRILLATION BURDEN IN THE BLANKING PERIOD IS ASSOCIATED WITH A HIGH RISK OF RECURRENCE AFTER CATHETER ABLATION

Author

Bidaoui, Ghassan, Lim, Chanho, Younes, Hadi, Assaf, Ala, Chouman, Nour, Chamoun, Nadia, Bsoul, Mayana, Tirado, Francisco, Huang, Chao, Feng, Han, Liu, Yingshuo, Jia, Yishi, McGarvey, Cecile, Tsakiris, Eli, Dahl, Alexander, Lunn, Emma, Mekhael, Mario, Noujaim, Charbel, Pandey, Amitabh C., Donnellan, Eoin, Rao, Swati, Kreidieh, Omar, and Marrouche, Nassir F.

Published
2024
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49. PO-03-024 CLUSTER ANALYSIS TO IDENTIFY PATTERNS OF FIBROSIS DISTRIBUTION AMONG PERSISTENT ATRIAL FIBRILLATION PATIENTS WITH HIGH LEFT ATRIAL VOLUME

Author

Feng, Han, Gu, Yuxuan, Assaf, Ala, Mekhael, Mario, Younes, Hadi, Lim, Chanho, Li, Xiang, Qian, Qian, He, Hua, Liu, Yingshuo, Jia, Yishi, Bidaoui, Ghassan, Bsoul, Mayana, Chamoun, Nadia, Tirado, Francisco, Chouman, Nour, Young, Monique, Morales, Madison, Huang, Chao, Pandey, Amitabh C., Rao, Swati, Donnellan, Eoin, Kreidieh, Omar, and Marrouche, Nassir F.

Published
2024
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50. PO-03-023 USING MACHINE LEARNING-BASED METHOD TO REDEFINE THE SEVERITY OF ATRIAL FIBRILLATION

Author

Feng, Han, Gu, Yuxuan, Lim, Chanho, Assaf, Ala, Mekhael, Mario, Younes, Hadi, Li, Xiang, Qian, Qian, He, Hua, Liu, Yingshuo, Jia, Yishi, Chouman, Nour, Noujaim, Charbel, Bidaoui, Ghassan, Bsoul, Mayana, Chamoun, Nadia, Tirado, Francisco, Young, Monique, Morales, Madison, Huang, Chao, Donnellan, Eoin, Kreidieh, Omar, Pandey, Amitabh C., Rao, Swati, and Marrouche, Nassir F.

Published
2024
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