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224 results on '"Konstantopoulos, Charalampos"'

1. Enhancing shopping experiences in smart retailing

Author

Bourg, Lorena, Chatzidimitris, Thomas, Chatzigiannakis, Ioannis, Gavalas, Damianos, Giannakopoulou, Kalliopi, Kasapakis, Vlasios, Konstantopoulos, Charalampos, Kypriadis, Damianos, Pantziou, Grammati, and Zaroliagis, Christos

Published
2023
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4. Renewable Mobility in Smart Cities:TheMOVESMART Approach

Author

Gavalas, Damianos, Giannakopoulou, Kalliopi, Kasapakis, Vlasios, Kehagias, Dionisis, Konstantopoulos, Charalampos, Kontogiannis, Spyros, Kypriadis, Damianos, Pantziou, Grammati, Paraskevopoulos, Andreas, Zaroliagis, Christos, Chlamtac, Imrich, Series Editor, Banat, Mohammad M., editor, and Paiva, Sara, editor

Published
2020
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5. Design and Management of Vehicle Sharing Systems: A Survey of Algorithmic Approaches

Author

Gavalas, Damianos, Konstantopoulos, Charalampos, and Pantziou, Grammati

Subjects
Computer Science - Data Structures and Algorithms, F.2, G.2.1
Abstract

Vehicle (bike or car) sharing represents an emerging transportation scheme which may comprise an important link in the green mobility chain of smart city environments. This chapter offers a comprehensive review of algorithmic approaches for the design and management of vehicle sharing systems. Our focus is on one-way vehicle sharing systems (wherein customers are allowed to pick-up a vehicle at any location and return it to any other station) which best suits typical urban journey requirements. Along this line, we present methods dealing with the so-called asymmetric demand-offer problem (i.e. the unbalanced offer and demand of vehicles) typically experienced in one-way sharing systems which severely affects their economic viability as it implies that considerable human (and financial) resources should be engaged in relocating vehicles to satisfy customer demand. The chapter covers all planning aspects that affect the effectiveness and viability of vehicle sharing systems: the actual system design (e.g. number and location of vehicle station facilities, vehicle fleet size, vehicles distribution among stations); customer incentivisation schemes to motivate customer-based distribution of bicycles/cars (such schemes offer meaningful incentives to users so as to leave their vehicle to a station different to that originally intended and satisfy future user demand); cost-effective solutions to schedule operator-based repositioning of bicycles/cars (by employees explicitly enrolled in vehicle relocation) based on the current and future (predicted) demand patterns (operator-based and customer-based relocation may be thought as complementary methods to achieve the intended distribution of vehicles among stations)., Comment: 38 pages, 3 figures, 4 tables, In: "Smart Cities and Homes: Key Enabling Technologies", M.S. Obaidat and P. Nicopolitidis (Eds.), Elsevier Science, in press

Published
2015

7. Enhanced Buying Experiences in Smart Cities: The SMARTBUY Approach

Author

Bourg, Lorena, Chatzidimitris, Thomas, Chatzigiannakis, Ioannis, Gavalas, Damianos, Giannakopoulou, Kalliopi, Kasapakis, Vlasios, Konstantopoulos, Charalampos, Kypriadis, Damianos, Pantziou, Grammati, Zaroliagis, Christos, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Chatzigiannakis, Ioannis, editor, De Ruyter, Boris, editor, and Mavrommati, Irene, editor

Published
2019
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10. Clustering of Mobile Ad Hoc Networks: An Adaptive Broadcast Period Approach

Author

Gavalas, Damianos, Pantziou, Grammati, Konstantopoulos, Charalampos, and Mamalis, Basilis

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing, Computer Science - Data Structures and Algorithms
Abstract

Organization, scalability and routing have been identified as key problems hindering viability and commercial success of mobile ad hoc networks. Clustering of mobile nodes among separate domains has been proposed as an efficient approach to address those issues. In this work, we introduce an efficient distributed clustering algorithm that uses both location and energy metrics for cluster formation. Our proposed solution mainly addresses cluster stability, manageability and energy efficiency issues. Also, unlike existing active clustering methods, our algorithm relieves the network from the unnecessary burden of control messages broadcasting, especially for relatively static network topologies. This is achieved through adapting broadcast period according to mobile nodes mobility pattern. The efficiency, scalability and competence of our algorithm against alternative approaches have been demonstrated through simulation results., Comment: 7 pages, 9 figures; IEEE International Conference on Communications, 2006. ICC '06

Published
2011
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11. Lowest-ID with Adaptive ID Reassignment: A Novel Mobile Ad-Hoc Networks Clustering Algorithm

Author

Gavalas, Damianos, Pantziou, Grammati, Konstantopoulos, Charalampos, and Mamalis, Basilis

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

Clustering is a promising approach for building hierarchies and simplifying the routing process in mobile ad-hoc network environments. The main objective of clustering is to identify suitable node representatives, i.e. cluster heads (CHs), to store routing and topology information and maximize clusters stability. Traditional clustering algorithms suggest CH election exclusively based on node IDs or location information and involve frequent broadcasting of control packets, even when network topology remains unchanged. More recent works take into account additional metrics (such as energy and mobility) and optimize initial clustering. However, in many situations (e.g. in relatively static topologies) re-clustering procedure is hardly ever invoked; hence initially elected CHs soon reach battery exhaustion. Herein, we introduce an efficient distributed clustering algorithm that uses both mobility and energy metrics to provide stable cluster formations. CHs are initially elected based on the time and cost-efficient lowest-ID method. During clustering maintenance phase though, node IDs are re-assigned according to nodes mobility and energy status, ensuring that nodes with low-mobility and sufficient energy supply are assigned low IDs and, hence, are elected as CHs. Our algorithm also reduces control traffic volume since broadcast period is adjusted according to nodes mobility pattern: we employ infrequent broadcasting for relative static network topologies, and increase broadcast frequency for highly mobile network configurations. Simulation results verify that energy consumption is uniformly distributed among network nodes and that signaling overhead is significantly decreased., Comment: 5 pages, 4 figures; Proceedings of the 1st IEEE International Symposium on Wireless Pervasive Computing (ISWPC'2006)

Published
2011
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13. Renewable Mobility in Smart Cities:TheMOVESMART Approach

Author

Gavalas, Damianos, primary, Giannakopoulou, Kalliopi, additional, Kasapakis, Vlasios, additional, Kehagias, Dionisis, additional, Konstantopoulos, Charalampos, additional, Kontogiannis, Spyros, additional, Kypriadis, Damianos, additional, Pantziou, Grammati, additional, Paraskevopoulos, Andreas, additional, and Zaroliagis, Christos, additional

Published
2020
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18. Efficient Heuristics for the Time Dependent Team Orienteering Problem with Time Windows

Author

Gavalas, Damianos, Konstantopoulos, Charalampos, Mastakas, Konstantinos, Pantziou, Grammati, Vathis, Nikolaos, 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, Gupta, Prosenjit, editor, and Zaroliagis, Christos, editor

Published
2014
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25. Cluster-Based Heuristics for the Team Orienteering Problem with Time Windows

Author

Gavalas, Damianos, Konstantopoulos, Charalampos, Mastakas, Konstantinos, Pantziou, Grammati, Tasoulas, Yiannis, 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, Bonifaci, Vincenzo, editor, Demetrescu, Camil, editor, and Marchetti-Spaccamela, Alberto, editor

Published
2013
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26. Watershed-Based Clustering for Energy Efficient Data Gathering in Wireless Sensor Networks with Mobile Collector

Author

Konstantopoulos, Charalampos, Mamalis, Basilis, Pantziou, Grammati, Thanasias, Vasileios, 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, Kaklamanis, Christos, editor, Papatheodorou, Theodore, editor, and Spirakis, Paul G., editor

Published
2012
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28. Mobile Sinks for Information Retrieval from Cluster-Based WSN Islands

Author

Pantziou, Grammati, Mpitziopoulos, Aristides, Gavalas, Damianos, Konstantopoulos, Charalampos, Mamalis, Basilis, 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, Ruiz, Pedro M., editor, and Garcia-Luna-Aceves, Jose Joaquin, editor

Published
2009
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32. A Mobility Aware Technique for Clustering on Mobile Ad-Hoc Networks

Author

Konstantopoulos, Charalampos, Gavalas, Damianos, Pantziou, Grammati, 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, Chaudhuri, Soma, editor, Das, Samir R., editor, Paul, Himadri S., editor, and Tirthapura, Srikanta, editor

Published
2006
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33. Stable and Energy Efficient Clustering of Wireless Ad-Hoc Networks with LIDAR Algorithm

Author

Gavalas, Damianos, Pantziou, Grammati, Konstantopoulos, Charalampos, Mamalis, Basilis, 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, Cuenca, Pedro, editor, and Orozco-Barbosa, Luiz, editor

Published
2006
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34. Efficient Active Clustering of Mobile Ad-Hoc Networks

Author

Gavalas, Damianos, Pantziou, Grammati, Konstantopoulos, Charalampos, Mamalis, Basilis, 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, Bozanis, Panayiotis, editor, and Houstis, Elias N., editor

Published
2005
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35. Optimal Embedding of the Hypercube on Partitioned Optical Passive Stars Networks

Author

Kaklamanis, Christos, Konstantopoulos, Charalampos, 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, Cunha, José C., editor, and Medeiros, Pedro D., editor

Published
2005
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37. Sliding-Window Compression on the Hypercube

Author

Konstantopoulos, Charalampos, Svolos, Andreas, Kaklamanis, Christos, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Bode, Arndt, editor, Ludwig, Thomas, editor, Karl, Wolfgang, editor, and Wismüller, Roland, editor

Published
2000
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48. Enhancing shopping experiences in smart retailing

Author

Bourg, Lorena, primary, Chatzidimitris, Thomas, additional, Chatzigiannakis, Ioannis, additional, Gavalas, Damianos, additional, Giannakopoulou, Kalliopi, additional, Kasapakis, Vlasios, additional, Konstantopoulos, Charalampos, additional, Kypriadis, Damianos, additional, Pantziou, Grammati, additional, and Zaroliagis, Christos, additional

Published
2021
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