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367 results on '"Hadjiefthymiades, Stathes"'

1. Stepwise correlation of multivariate IoT event data based on first-order Markov chains

Author

Papataxiarhis, Vassilis, Vassilopoulou, Thomais, Kostakonti, Sofia, and Hadjiefthymiades, Stathes

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

Correlating events in complex and dynamic IoT environments is a challenging task not only because of the amount of available data that needs to be processed but also due to the call for time efficient data processing. In this paper, we discuss the major steps that should be performed in real- or near real-time event management focusing on event detection and event correlation. We investigate the adoption of a univariate change detection algorithm for real-time event detection and we propose a stepwise event correlation scheme based on a first-order Markov model. The proposed theory is applied on the maritime domain and is validated through extensive experimentation with real sensor streams originating from large-scale sensor networks deployed in a maritime fleet of ships., Comment: arXiv admin note: substantial text overlap with arXiv:1803.05636

Published
2023

2. A Stock Options Metaphor for Content Delivery Networks

Author

Vathias, Elias and Hadjiefthymiades, Stathes

Subjects
Computer Science - Networking and Internet Architecture, Computer Science - Computational Engineering, Finance, and Science, 91-10 (Primary), C.2.4, I.6.6
Abstract

The concept of Stock Options is used to address the scarcity of resources, not adequately addressed by the previous tools of our Prediction Mechanism. Using a Predictive Reservation Scheme, network and disk resources are being monitored through well-established techniques (Kernel Regression Estimators) in a given time frame. Next, an Secondary Market mechanism significantly improves the efficiency and robustness of our Predictive Reservation Scheme by allowing the fast exchange of unused (remaining) resources between the Origin Servers (CDN Clients). This exchange can happen, either by implementing socially optimal practices or by allowing automatic electronic auctions at the end of the day or at shorter time intervals. Finally, we further enhance our Prediction Mechanism; Stock Options are obtained and exercised, depending on the lack of resources at the end of day. As a result, Origin Servers may acquire resources (if required) at a normal price. The effectiveness of our mechanism further improves., Comment: 35 pages, 13 figures. Netnomics (2022)

Published
2020
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3. On the Innovative Management of Remote Robotic Experimentation

Author

Panagidi, Kakia, Riazuelo, Luis, Alonso, Iñigo, Murillo, Ana C., Montano, Luis, Cantero, Miquel, Martins, Ricardo, Kolomvatsos, Kostas, Hadjiefthymiades, Stathes, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Tardioli, Danilo, editor, Matellán, Vicente, editor, Heredia, Guillermo, editor, Silva, Manuel F., editor, and Marques, Lino, editor

Published
2023
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4. Event Correlation and Forecasting over Multivariate Streaming Sensor Data

Author

Papataxiarhis, Vassilis and Hadjiefthymiades, Stathes

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

Event management in sensor networks is a multidisciplinary field involving several steps across the processing chain. In this paper, we discuss the major steps that should be performed in real- or near real-time event handling including event detection, correlation, prediction and filtering. First, we discuss existing univariate and multivariate change detection schemes for the online event detection over sensor data. Next, we propose an online event correlation scheme that intends to unveil the internal dynamics that govern the operation of a system and are responsible for the generation of various types of events. We show that representation of event dependencies can be accommodated within a probabilistic temporal knowledge representation framework that allows the formulation of rules. We also address the important issue of identifying outdated dependencies among events by setting up a time-dependent framework for filtering the extracted rules over time. The proposed theory is applied on the maritime domain and is validated through extensive experimentation with real sensor streams originating from large-scale sensor networks deployed in ships., Comment: 17 pages, 15 figures

Published
2018

7. Next Generation Internet Research and Experimentation

Author

Serrano, Martin, primary, Boniface, Michael, additional, Calisti, Monique, additional, Schaffers, Hans, additional, Domingue, John, additional, Willner, Alexander, additional, Petrioli, Chiara, additional, Facca, Federico M., additional, Moerman, Ingrid, additional, Marquez-Barja, Johann M., additional, Martrat, Josep, additional, Gurgen, Levent, additional, Ziegler, Sebastien, additional, Kotrotsos, Serafim, additional, Fernandez, Sergi Figuerola, additional, Hadjiefthymiades, Stathes, additional, Kuehrer, Susanne, additional, Korakis, Thanasis, additional, Walters, Tim, additional, and Friedman, Timur, additional

Published
2022
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10. Internet of Things Business Models: The RAWFIE Case

Author

Papadopoulou, Panagiota, Kolomvatsos, Kostas, Hadjiefthymiades, Stathes, 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, Pappas, Ilias O., editor, Mikalef, Patrick, editor, Dwivedi, Yogesh K., editor, Jaccheri, Letizia, editor, Krogstie, John, editor, and Mäntymäki, Matti, editor

Published
2019
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11. A Spatio-Temporal Data Imputation Model for Supporting Analytics at the Edge

Author

Kolomvatsos, Kostas, Papadopoulou, Panagiota, Anagnostopoulos, Christos, Hadjiefthymiades, Stathes, 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, Pappas, Ilias O., editor, Mikalef, Patrick, editor, Dwivedi, Yogesh K., editor, Jaccheri, Letizia, editor, Krogstie, John, editor, and Mäntymäki, Matti, editor

Published
2019
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14. A Generic and Scalable IoT Data Fusion Infrastructure

Author

Nomikos, Vangelis, Priggouris, Ioannis, Bismpikis, George, Hadjiefthymiades, Stathes, Sekkas, Odysseas, Patnaik, Srikanta, Series editor, Sethi, Ishwar, Series editor, Li, Xiaolong, Series editor, Mavromoustakis, Constandinos X., editor, Mastorakis, George, editor, and Batalla, Jordi Mongay, editor

Published
2016
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28. Tuning the Epidemical Algorithm in Wireless Sensor Networks

Author

Gerakos, Kostis, Anagnostopoulos, Christos, Hadjiefthymiades, Stathes, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Coulson, Geoffrey, Series editor, Georgiadis, Christos K., editor, Jahankhani, Hamid, editor, Pimenidis, Elias, editor, Bashroush, Rabih, editor, and Al-Nemrat, Ameer, editor

Published
2012
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29. On the Use of Optimal Stopping Theory for Improving Cache Consistency

Author

Spanoudakis, Manos, Lorentzos, Dimitris, Anagnostopoulos, Christos, Hadjiefthymiades, Stathes, 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, Wang, X. Sean, editor, Cruz, Isabel, editor, Delis, Alex, editor, and Huang, Guangyan, editor

Published
2012
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32. An Online Adaptive Model for Location Prediction

Author

Anagnostopoulos, Theodoros, Anagnostopoulos, Christos, Hadjiefthymiades, Stathes, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Coulson, Geoffrey, Series editor, Vasilakos, Athanasius V., editor, Beraldi, Roberto, editor, Friedman, Roy, editor, and Mamei, Marco, editor

Published
2010
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33. Context Discovery in Mobile Environments: A Particle Swarm Optimization Approach

Author

Anagnostopoulos, Christos, Hadjiefthymiades, Stathes, Akan, Ozgur, Series editor, Bellavista, Paolo, Series editor, Cao, Jiannong, Series editor, Dressler, Falko, Series editor, Ferrari, Domenico, Series editor, Gerla, Mario, Series editor, Kobayashi, Hisashi, Series editor, Palazzo, Sergio, Series editor, Sahni, Sartaj, Series editor, Shen, Xuemin (Sherman), Series editor, Stan, Mircea, Series editor, Xiaohua, Jia, Series editor, Zomaya, Albert, Series editor, Coulson, Geoffrey, Series editor, Vasilakos, Athanasius V., editor, Beraldi, Roberto, editor, Friedman, Roy, editor, and Mamei, Marco, editor

Published
2010
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37. MNISIKLIS:Indoor Location Based Services for All

Author

Papataxiarhis, Vassilis, Riga, Vivi, Nomikos, Vangelis, Sekkas, Odysseas, Kolomvatsos, Kostas, Tsetsos, Vassileios, Papageorgas, Panagiotis, Vourakis, Stelios, Xouris, Vasileios, Hadjiefthymiades, Stathes, Kouroupetroglou, Georgios, Cartwright, William, editor, Gartner, Georg, editor, Meng, Liqiu, editor, Peterson, Michael P., editor, and Rehrl, Karl, editor

Published
2009
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38. User Modeling for Pedestrian Navigation Services

Author

Kikiras, Panayotis, Tsetsos, Vassileios, Papataxiarhis, Vassilis, Katsikas, Thanassis, Hadjiefthymiades, Stathes, 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, Kuflik, Tsvi, editor, Berkovsky, Shlomo, editor, Carmagnola, Francesca, editor, Heckmann, Dominikus, editor, and Krüger, Antonio, editor

Published
2009
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40. Sensor-Driven Adaptation of Web Document Presentation

Author

Nathanail, Spyros, Tsetsos, Vassileios, Hadjiefthymiades, Stathes, 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, and Stephanidis, Constantine, editor

Published
2007
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41. A Client/Intercept Based System for Optimizing Wireless Access to Web Services

Author

Kilanioti, Irene, Sotiropoulou, Georgia, Hadjiefthymiades, Stathes, 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, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Kutvonen, Lea, editor, and Alonistioti, Nancy, editor

Published
2005
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42. MITOS: A Smart Spaces System for Pervasive Computing

Author

Alyfantis, George, Hadjiefthymiades, Stathes, Merakos, Lazaros, 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, Lindner, Wolfgang, editor, Mesiti, Marco, editor, Türker, Can, editor, Tzitzikas, Yannis, editor, and Vakali, Athena I., editor

Published
2005
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44. A Game Theoretic Approach to Web Caching

Author

Hadjiefthymiades, Stathes, Georgiadis, Yiannis, Merakos, Lazaros, Goos, Gerhard, editor, Hartmanis, Juris, editor, van Leeuwen, Jan, editor, Mitrou, Nikolas, editor, Kontovasilis, Kimon, editor, Rouskas, George N., editor, Iliadis, Ilias, editor, and Merakos, Lazaros, editor

Published
2004
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