Christos Bouras
Short CV: Christos Bouras is Professor in the University of Patras, Department of Computer Engineering and Informatics. Also he is a scientific advisor of Research Unit 6 in Computer Technology Institute and Press – Diophantus, Patras, Greece. His research interests include Analysis of Performance of Networking and Computer Systems, Computer Networks and Protocols, Mobile and Wireless Communications, Telematics and New Services, QoS and Pricing for Networks and Services, e-learning, Networked Virtual Environments and WWW Issues. He has extended professional experience in Design and Analysis of Networks, Protocols, Telematics and New Services. He has published more than 450 papers in various well-known refereed books, conferences and journals. He is a co-author of 9 books in Greek and editor of 2 in English. He has been member of editorial board for international journals and PC member and referee in various international journals and conferences. He has participated in R&D projects.
Book Chapters
Bouras, Christos; Alexiou, Antonios; Papazois, Andreas
Congestion Control for Multicast Transmission over UMTS Book Chapter
In: Wireless Quality of Service: Techniques, Standards and Applications, Chapter 10, pp. 291 - 312, Auerbach Publications, Taylor & Francis Group, 2009.
Abstract | Links | BibTeX | Tags: Congestion Control, UMTS
@inbook{3129,
title = {Congestion Control for Multicast Transmission over UMTS},
author = {Christos Bouras and Antonios Alexiou and Andreas Papazois},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/9346final_chapter_with_pics.pdf},
year = {2009},
date = {2009-01-01},
urldate = {2009-01-01},
booktitle = {Wireless Quality of Service: Techniques, Standards and Applications},
pages = {291 - 312},
publisher = {Auerbach Publications, Taylor & Francis Group},
chapter = {10},
organization = {Auerbach Publications, Taylor & Francis Group},
abstract = {<p>In this chapter, we present a novel mechanism for the multicast congestion control over Universal Mobile Telecommunications System (UMTS) networks. The proposed mechanism is based on the well known TCP-Friendly Multicast Congestion Control (TFMCC) scheme. TFMCC is an equation-based multicast congestion control mechanism intended to scale to groups of several thousand receivers. It is based on the concept of Current Limiting Receiver (CLR). The CLR is the receiver that the sender believes currently has the lowest expected throughput of the multicast group. The key challenge in the design of the new scheme lies in extending TFMCC in order to support the UMTS Terrestrial Radio-Access Network (UTRAN). Our major contribution is that the TFMCC mechanism was improved in order to cope with the packet losses caused by either the temporary or the permanent degradation of the wireless channel. One of the major advantages of the proposed scheme is that it introduces minor modifications in the UMTS nodes with respect to the computing power of the mobile terminals. Finally, we implement our approach in the ns-2 network simulator and we evaluate it under various conditions. The simulation results are presented along with their analysis.</p>},
keywords = {Congestion Control, UMTS},
pubstate = {published},
tppubtype = {inbook}
}
<p>In this chapter, we present a novel mechanism for the multicast congestion control over Universal Mobile Telecommunications System (UMTS) networks. The proposed mechanism is based on the well known TCP-Friendly Multicast Congestion Control (TFMCC) scheme. TFMCC is an equation-based multicast congestion control mechanism intended to scale to groups of several thousand receivers. It is based on the concept of Current Limiting Receiver (CLR). The CLR is the receiver that the sender believes currently has the lowest expected throughput of the multicast group. The key challenge in the design of the new scheme lies in extending TFMCC in order to support the UMTS Terrestrial Radio-Access Network (UTRAN). Our major contribution is that the TFMCC mechanism was improved in order to cope with the packet losses caused by either the temporary or the permanent degradation of the wireless channel. One of the major advantages of the proposed scheme is that it introduces minor modifications in the UMTS nodes with respect to the computing power of the mobile terminals. Finally, we implement our approach in the ns-2 network simulator and we evaluate it under various conditions. The simulation results are presented along with their analysis.</p>
Bouras, Christos; Tsiatsos, Thrasivoulos; Giannaka, Eleftheria
An Integrated Architecture for Supporting Vocational Training Book Chapter
In: Architecture Solutions for e-Learning Systems, pp. 197 - 218, IDEA Group Publishing, 2008.
Abstract | Links | BibTeX | Tags:
@inbook{3128,
title = {An Integrated Architecture for Supporting Vocational Training},
author = {Christos Bouras and Thrasivoulos Tsiatsos and Eleftheria Giannaka},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/172311.pdf},
year = {2008},
date = {2008-01-01},
urldate = {2008-01-01},
booktitle = {Architecture Solutions for e-Learning Systems},
pages = {197 - 218},
publisher = {IDEA Group Publishing},
organization = {IDEA Group Publishing},
abstract = {<p>E-learning and Web-based training have evolved over time from a newborn trend for complementing the learning process to a major form of education and training for supporting mainly geographically scattered users. The basic aim of this chapter is the description of a platform for open and distance training, which is mainly focused at supporting the needs of Vocational Training Centers as well as of institutions providing life-long adult training and learning. In particular, the issues that this chapter focuses on are vocational education and training characteristics and requirements, the current situation and technological trends in ICT-supported VET, the development framework and processes while it also proposes basic vocational training services and the system architecture of the integrated platform. The presented platform aims to provide services of both synchronous and asynchronous and collaborative distance learning.</p>},
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<p>E-learning and Web-based training have evolved over time from a newborn trend for complementing the learning process to a major form of education and training for supporting mainly geographically scattered users. The basic aim of this chapter is the description of a platform for open and distance training, which is mainly focused at supporting the needs of Vocational Training Centers as well as of institutions providing life-long adult training and learning. In particular, the issues that this chapter focuses on are vocational education and training characteristics and requirements, the current situation and technological trends in ICT-supported VET, the development framework and processes while it also proposes basic vocational training services and the system architecture of the integrated platform. The presented platform aims to provide services of both synchronous and asynchronous and collaborative distance learning.</p>
Bouras, Christos; Primpas, Dimitris; Alexiou, Antonios; Papagiannopoulos, J
Metropolitan Broadband Networks: Design and implementation aspects and business models Book Chapter
In: Global Diffusion of Broadband Data Transmission: Factors Affecting the Adoption, Usage and Economics of Broadband, vol. 1, Chapter XIII, pp. 196 - 210, IDEA Group Publishing, 2008.
Abstract | Links | BibTeX | Tags:
@inbook{3127,
title = {Metropolitan Broadband Networks: Design and implementation aspects and business models},
author = {Christos Bouras and Dimitris Primpas and Antonios Alexiou and J Papagiannopoulos},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/4113Dwived196.pdf},
year = {2008},
date = {2008-01-01},
urldate = {2008-01-01},
booktitle = {Global Diffusion of Broadband Data Transmission: Factors Affecting the Adoption, Usage and Economics of Broadband},
volume = {1},
pages = {196 - 210},
publisher = {IDEA Group Publishing},
chapter = {XIII},
organization = {IDEA Group Publishing},
abstract = {<p>This chapter presents the design principles that cover the implementation of broadband infrastructure in the region of Western Greece, by examining all the necessary parameters that arise while implementing such a critical developmental project. The broadband infrastructure that is deployed is either based on optical fiber (on big municipalities) or on wireless systems (OFDM based and WiFi cells). Furthermore, we present as two case studies, all issues of the designing of the Metropolitan Area Network of Patras, the third biggest city of Greece and the Wireless Access Network of Messatida. The major target of the broadband networks is to interconnect the buildings of the public sector in the city and also deploy infrastructure (fibers or wireless systems) that will create conditions of competition in providing both access and content services in advantage of the end consumer. The usage of the broadband infrastructure by service providers will be based on the open availability of the infrastructure in a cost effective way. Finally, we present the main characteristics of a proposed business plan that ensures financial viability of the broadband infrastructure and guarantees the administration, growth, and exploitation of infrastructure.</p>},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
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<p>This chapter presents the design principles that cover the implementation of broadband infrastructure in the region of Western Greece, by examining all the necessary parameters that arise while implementing such a critical developmental project. The broadband infrastructure that is deployed is either based on optical fiber (on big municipalities) or on wireless systems (OFDM based and WiFi cells). Furthermore, we present as two case studies, all issues of the designing of the Metropolitan Area Network of Patras, the third biggest city of Greece and the Wireless Access Network of Messatida. The major target of the broadband networks is to interconnect the buildings of the public sector in the city and also deploy infrastructure (fibers or wireless systems) that will create conditions of competition in providing both access and content services in advantage of the end consumer. The usage of the broadband infrastructure by service providers will be based on the open availability of the infrastructure in a cost effective way. Finally, we present the main characteristics of a proposed business plan that ensures financial viability of the broadband infrastructure and guarantees the administration, growth, and exploitation of infrastructure.</p>
Bouras, Christos; Nani, Maria
Using Open Source to Building and Accessing Learning Objects and Online Courses Book Chapter
In: Open Source for Knowledge and LearningManagement: Strategies beyond Tools, pp. 268 - 298, IDEA Group Publishing, 2007.
Abstract | Links | BibTeX | Tags:
@inbook{3126,
title = {Using Open Source to Building and Accessing Learning Objects and Online Courses},
author = {Christos Bouras and Maria Nani},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/758409Bouras_Nani.pdf},
year = {2007},
date = {2007-01-01},
urldate = {2007-01-01},
booktitle = {Open Source for Knowledge and LearningManagement: Strategies beyond Tools},
pages = {268 - 298},
publisher = {IDEA Group Publishing},
organization = {IDEA Group Publishing},
abstract = {As e-learning continuously gains the interest of the scientific community, industry, and government, a wide variety of learning technology products have been incorporated into the marketplace. Advances in information and communication technologies are in favor of the incorporation of innovative services and functionalities in such systems, though content creation and delivery remain the two key factors in any e-learning system. Therefore, in this chapter, we present the design and implementation of a tool targeted at building and accessing learning objects and online courses through the Web. This tool aims to facilitate instructors and trainers to easily develop accessible, reusable, and traceable learning content that can meet their distant students? needs for anytime and anyplace learning. Learners are able to access learning content, in addition to consulting, at any time, reports on their interactions within a course and get support by subject experts. Furthermore, all users can request to upgrade their role in the system and, thus, actively participate in the learning process. Special attention has been paid on the utilization of reliable and qualitative open source technologies and Web standards so that the proposed solution can form an easily accessible system.},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
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As e-learning continuously gains the interest of the scientific community, industry, and government, a wide variety of learning technology products have been incorporated into the marketplace. Advances in information and communication technologies are in favor of the incorporation of innovative services and functionalities in such systems, though content creation and delivery remain the two key factors in any e-learning system. Therefore, in this chapter, we present the design and implementation of a tool targeted at building and accessing learning objects and online courses through the Web. This tool aims to facilitate instructors and trainers to easily develop accessible, reusable, and traceable learning content that can meet their distant students? needs for anytime and anyplace learning. Learners are able to access learning content, in addition to consulting, at any time, reports on their interactions within a course and get support by subject experts. Furthermore, all users can request to upgrade their role in the system and, thus, actively participate in the learning process. Special attention has been paid on the utilization of reliable and qualitative open source technologies and Web standards so that the proposed solution can form an easily accessible system.
Bouras, Christos; Tsiatsos, Thrasivoulos; Giannaka, Eleftheria; Panagopoulos, Alexandros; Nani, Maria
An Integrated Platform for Educational Virtual Environments Book Chapter
In: Web-Based Intelligent e - Learning Systems: Technologies and Applications, Chapter XV, pp. 291 - 320, IDEA Group Publishing, 2006.
Abstract | Links | BibTeX | Tags:
@inbook{3122,
title = {An Integrated Platform for Educational Virtual Environments},
author = {Christos Bouras and Thrasivoulos Tsiatsos and Eleftheria Giannaka and Alexandros Panagopoulos and Maria Nani},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/81341159.pdf},
year = {2006},
date = {2006-01-01},
urldate = {2006-01-01},
booktitle = {Web-Based Intelligent e - Learning Systems: Technologies and Applications},
pages = {291 - 320},
publisher = {IDEA Group Publishing},
chapter = {XV},
organization = {IDEA Group Publishing},
abstract = {In this chapter, we present the design and implementation of an integrated platform for Educational Virtual Environments. This platform aims to support an educational community, synchronous online courses in multi-user three-dimensional (3D) environments, and the creation and access of asynchronous courses through a learning content management system. In order to offer synchronous courses, we have implemented a system called EVE-II, which supports stable event sharing for multi-user 3D places, easy creation of multi-user 3D places, H.323-based voice- over IP services fully integrated in a 3D space, as well as many concurrent 3D multi-user spaces.},
keywords = {},
pubstate = {published},
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In this chapter, we present the design and implementation of an integrated platform for Educational Virtual Environments. This platform aims to support an educational community, synchronous online courses in multi-user three-dimensional (3D) environments, and the creation and access of asynchronous courses through a learning content management system. In order to offer synchronous courses, we have implemented a system called EVE-II, which supports stable event sharing for multi-user 3D places, easy creation of multi-user 3D places, H.323-based voice- over IP services fully integrated in a 3D space, as well as many concurrent 3D multi-user spaces.
Bouras, Christos; Konidaris, Agis
Modeling Data Intensive Web Sites for Personalisation, Integrity and Performance Book Chapter
In: Information Modeling for Internet Applications, Chapter XII, pp. 259 - 276, IDEA Group Publishing, 2003.
Abstract | Links | BibTeX | Tags:
@inbook{3123,
title = {Modeling Data Intensive Web Sites for Personalisation, Integrity and Performance},
author = {Christos Bouras and Agis Konidaris},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/7151905.pdf},
year = {2003},
date = {2003-01-01},
urldate = {2003-01-01},
booktitle = {Information Modeling for Internet Applications},
pages = {259 - 276},
publisher = {IDEA Group Publishing},
chapter = {XII},
organization = {IDEA Group Publishing},
abstract = {This chapter presents a step-by-step approach to the design, implementation and management of a Data-Intensive Web Site (DIWS). The approach introduces five data formulation and manipulation graphs that are presented analytically. The core concept behind the modeling approach is that of “Web fragments,” that is an information decomposition technique that aids design, implementation and management of DIWS. We then present the steps that must be followed in order to “build” a DIWS based on Web fragments. Finally, we show how our approach can be used to ensure the basic DIWS user requirements of personalization, integrity and performance.},
keywords = {},
pubstate = {published},
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This chapter presents a step-by-step approach to the design, implementation and management of a Data-Intensive Web Site (DIWS). The approach introduces five data formulation and manipulation graphs that are presented analytically. The core concept behind the modeling approach is that of “Web fragments,” that is an information decomposition technique that aids design, implementation and management of DIWS. We then present the steps that must be followed in order to “build” a DIWS based on Web fragments. Finally, we show how our approach can be used to ensure the basic DIWS user requirements of personalization, integrity and performance.
Bouras, Christos; Konidaris, Agis; Sevasti, Afroditi
Virtual Environments in Educational Networks Book Chapter
In: COMMUNICATIONS AND NETWORKING IN EDUCATION Learning in a Networked society, Edited by T. Downes and D. Watson, pp. 195 - 203, Kluwer Academic Publishers, 2000.
Abstract | Links | BibTeX | Tags:
@inbook{3124,
title = {Virtual Environments in Educational Networks},
author = {Christos Bouras and Agis Konidaris and Afroditi Sevasti},
url = {https://telematics.upatras.gr/wp-content/uploads/2024/01/6551356.pdf},
year = {2000},
date = {2000-01-01},
urldate = {2000-01-01},
booktitle = {COMMUNICATIONS AND NETWORKING IN EDUCATION Learning in a Networked society, Edited by T. Downes and D. Watson},
pages = {195 - 203},
publisher = {Kluwer Academic Publishers},
organization = {Kluwer Academic Publishers},
abstract = {The field of Virtual Environments (VEs) is rapidly evolving into a new means of communication and accessing information, likely to overcome many existent technologies. However, being a new field makes the design and implementation of educational VEs an important aspect for scientific research in their educational potentials and the exploitation of existent technologies. New technologies in the field of VEs have appeared the establishment and combination of which, is yet to be investigated. This paper makes an effort to approach the issue of developing educational VEs introducing new aspects in the issues of interface, interaction with the user and functionality.},
keywords = {},
pubstate = {published},
tppubtype = {inbook}
}
The field of Virtual Environments (VEs) is rapidly evolving into a new means of communication and accessing information, likely to overcome many existent technologies. However, being a new field makes the design and implementation of educational VEs an important aspect for scientific research in their educational potentials and the exploitation of existent technologies. New technologies in the field of VEs have appeared the establishment and combination of which, is yet to be investigated. This paper makes an effort to approach the issue of developing educational VEs introducing new aspects in the issues of interface, interaction with the user and functionality.
Proceedings
Bouras, Christos; Tsiatsos, Thrasivoulos; Giannaka, Eleftheria
An Object Driven Partitioning Approach for Distributed Virtual Environments Proceedings
2007.
Abstract | Links | BibTeX | Tags:
@proceedings{2912,
title = {An Object Driven Partitioning Approach for Distributed Virtual Environments},
author = {Christos Bouras and Thrasivoulos Tsiatsos and Eleftheria Giannaka},
url = {https://telematics.upatras.gr/7430pdcat2007_bouras/},
year = {2007},
date = {2007-12-01},
urldate = {2007-12-01},
pages = {153-154},
abstract = {Distributed virtual environments tend to become a de facto solution for large-scale networked virtual environments. One of the key issues and problems that need to be handled in the design of a scalable and effective distributed virtual environment system is the partitioning problem, which refers to the efficient assignment of the systems workload to the available resources of the system. This paper presents an object driven partitioning approach based on the partitioning algorithm of Lui & Chan, who proposed a three step technique for balancing the workload among the servers of the Distributed Virtual Environment.},
keywords = {},
pubstate = {published},
tppubtype = {proceedings}
}
Distributed virtual environments tend to become a de facto solution for large-scale networked virtual environments. One of the key issues and problems that need to be handled in the design of a scalable and effective distributed virtual environment system is the partitioning problem, which refers to the efficient assignment of the systems workload to the available resources of the system. This paper presents an object driven partitioning approach based on the partitioning algorithm of Lui & Chan, who proposed a three step technique for balancing the workload among the servers of the Distributed Virtual Environment.
Book Sections
Bouras, Christos; Stamos, Kostas; Primpas, Dimitris; Sofia, Rute; Jiang, Sheng
Survey of IPv4 Dependencies in Global Grid Forum Book Section
In: 2005.
BibTeX | Tags:
@incollection{Bouras2005,
title = {Survey of IPv4 Dependencies in Global Grid Forum},
author = {Christos Bouras and Kostas Stamos and Dimitris Primpas and Rute Sofia and Sheng Jiang},
year = {2005},
date = {2005-01-01},
urldate = {2005-01-01},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
Bouras, Christos; Stamos, Kostas; Primpas, Dimitris; Sofia, Rute; Jiang, Sheng
Survey of IPv4 Dependencies in Global Grid Forum Sp Book Section
In: 2005.
@incollection{3156b,
title = {Survey of IPv4 Dependencies in Global Grid Forum Sp},
author = {Christos Bouras and Kostas Stamos and Dimitris Primpas and Rute Sofia and Sheng Jiang},
url = {Please contact us to obtain a copy of the document},
year = {2005},
date = {2005-01-01},
urldate = {2005-01-01},
series = {Ellinika Grammata},
keywords = {},
pubstate = {published},
tppubtype = {incollection}
}
Proceedings Articles
Bouras, Christos; Gkamas, Apostolos
SRAMT-LE: A hybrid sender and receiver-based adaptation scheme for TCP friendly multicast transmission using layered encoding Proceedings Article
In: Communication Networks and Distributed Systems Modeling and Simulation Conference (CNDS'03), pp. 71–76, 2003.
@inproceedings{bouras2003sramt,
title = {SRAMT-LE: A hybrid sender and receiver-based adaptation scheme for TCP friendly multicast transmission using layered encoding},
author = {Christos Bouras and Apostolos Gkamas},
url = {https://telematics.upatras.gr/39101106-2/},
year = {2003},
date = {2003-01-01},
urldate = {2003-01-01},
booktitle = {Communication Networks and Distributed Systems Modeling and Simulation Conference (CNDS'03)},
pages = {71–76},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}