@article {3061,
	title = {Efficient Web-Based Open and Distance Learning Services},
	journal = {Journal of Telematics and Informatics, Elsevier Science, Vol. 17, Issue 3},
	year = {2000},
	pages = { 213 - 237},
	abstract = {In this paper, we present data management issues faced during the design and development
of an open distance learning system for the University of Patras, Greece. In order to handle
data e\&$\#$129;ciently, as required in a web tele-training application, for each type of information
maintained, di\&$\#$128;erent strategies must be deployed according to their behaviour and structure.
The diversity and complexity of data, the network aspect of the application and web de{\textregistered}-
ciencies impose an architecture design incorporating a plethora of technologies and tools that
must be integrated in such a fashion that they e\&$\#$129;ciently organise these data preserving their
relationships. This presents a software engineering challenge requiring coherence of solutions
at all levels: structures, consistency, security, models, and protocols. The paper presents the
data components of an open and distance learning (ODL) system that access the information
stored in a database and the {\textregistered}le system, their underlying technology, their interaction with the
network services, and features regarding the ways they address issues faced in an open vendorindependent
distance learning environment and outlines the system{\textquoteright}s overall architecture. In
addition, this paper presents the architecture, the design and the services of a network-based
information system that supports open and distance learning activities. The open and distance
learning information system (ODLIS) o\&$\#$128;ers synchronous and asynchronous distance learning
and management of information system (MIS) services to support the educational procedure.
The ODLIS is a web-based application, which runs over the Internet using real time protocols.},
	author = {Christos Bouras and Apostolos Gkamas and Thrasivoulos Tsiatsos and P Destounis and J Garofalakis and G Sakalis and B Sakopoulos and J Tsaknakis}
}
@conference {2867,
	title = {The Performance of Simple Queueing Theoretic Video On Demand Algorithms},
	booktitle = {APPLIED INFORMATICS (AI 2000), Innsbruck, Austria},
	year = {2000},
	month = {14 - 17 February},
	abstract = {Video On Demand (VOD) Systems comprise an
emerging new technology, which is expected to
significantly affect everyday life. The implementation of
effective commercial VOD systems has to overcome some
technical limitations, such as the low bandwidth offered
by the existing communication channels. In our work we
present some simple queuing theoretic algorithms for the
optimal use of a limited number of communication
channels keeping a fair policy for the users requests. We
compare our algorithms with well-known algorithms, by
means of simulation.},
	author = {Christos Bouras and J Garofalakis and J Tzimas and P Petridis}
}
@article {3063,
	title = {A Cooperative Environment for Local Government: An Internet {\textendash} Intranet Approach},
	journal = {Journal of Telematics and Informatics, Elsevier Science, Vol. 16, Issue 1-2},
	year = {1999},
	pages = { 75 - 89},
	abstract = {<p>In this paper we present a Web-based, database oriented CSCW system to support information dispersal between di{\texteuro}erent Local Government authorities (Region, Prefecture and Municipalities) and the citizens. The system is implemented around the {\textquoteleft}shared workspace{\textquoteright} notion, a group of directories and {\textregistered}les controlled by the users of the workspace. Intranet and Extranet technologies are exploited to enable asynchronous and synchronous co-operation, manipulation of information from heterogeneous sources, security and easy administration, providing in parallel advanced communication facilities. We propose an innovative approach for the development of shared workspaces over WWW, based on state-of-the-art software platforms, integrating WWW and database technologies. The whole system was developed under a project funded by the Greek General Secretariat of Research and Technology and aims in the ecient distribution and management of information between and within di{\texteuro}erent types of local authorities (Municipalities, Prefectures).</p>
},
	author = {Christos Bouras and Vasilis Triantafillou and P Destounis and J Garofalakis and J Tzimas and P Zarafidis}
}
@conference {2819,
	title = {Cooperative Information Systems over the Internet and the WWW},
	booktitle = {EUROMEDIA 99-APTEC, Munich, Germany},
	year = {1999},
	month = {25 - 28 April},
	pages = { 232 - 236},
	abstract = {In this paper we present a WWW-based approach for the
development of a system supporting information sharing
within an organizational environment. The system developed
is exploiting Intranet and Extranet technologies enabling
asynchronous and synchronous cooperation, manipulation of
information from heterogeneous sources, security and easy
administration, providing in parallel advanced communication
facilities. We propose an innovative approach for the
development of shared workspaces over WWW, based on
state-of-the-art software platforms, integrating WWW and
database technologies. The whole system was developed
under a project funded by the Greek General Secretariat of
Research and Technology and aims in the efficient
distribution and management of information between and
within different types of local authorities (Municipalities,
Prefectures).},
	author = {Christos Bouras and Vasilis Triantafillou and P Destounis and J Garofalakis and J Tzimas and P Zarafidis}
}
@conference {2820,
	title = {Efficient Data Management to support Educational Activities},
	booktitle = {Interactive Computer aided Learning-Tools and Applications-ICL 99,Villach, Austria},
	year = {1999},
	month = {7 - 8 September},
	abstract = {In this paper we present data management issues faced during the design and
development of an Open Distance Learning system for the University of Patras,
Greece. In order to handle data efficiently, as required in a Web Tele-training
Application, for each type of information maintained different strategies must be
deployed according to their behaviourand structure.
The diversity and complexity of data, the network aspect of the application and web
deficiencies impose an architecture design incorporating a plethora of technologies
and tools that must be integrated in such a fashion that they efficiently organise these
data preserving their relationships. This presents a software engineering challenge
requiring coherence of solutions at all levels: structures, consistency, security, models,
and protocols.
The paper presents the data components of a open and distance learning system that
access the information stored in a database and the file system, their underlying
technology, their interaction with the network services, and features regarding the
ways they address issues faced in a open vendor-independent distance learning
environment and outlines the system{\textquoteright}s overall architecture.},
	author = {Christos Bouras and Apostolos Gkamas and Thrasivoulos Tsiatsos and P Destounis and J Garofalakis and G Sakalis and B Sakopoulos and J Tsaknakis}
}
@article {3064,
	title = {Analytical Performance Models for Multistage Interconnection Networks with finite, infinite and zero length buffers},
	journal = {PERFORMANCE EVALUATION JOURNAL, Elsevier Science, Vol. 34},
	year = {1998},
	pages = { 169 - 182},
	abstract = {Multistage Interconnection Networks (MINs) with crossbar switches have been used
to interconnect processors and memory modules in parallel multiprocessor systems.
They also play an increasingly important role in the development of ATM networks.
In this paper we analyze the general case of MINs, made of kxk switches with
finite, infinite or zero length buffers (unbuffered). The exact solution of the steady
state distribution of the first stage is derived for all cases. We use this to get an
approximation for the steady state distributions in the second stage and beyond. In
the case of unbuffered switches we reach the known exact solution for all the stages
of the MIN. Our results are validated by extensive simulations.},
	author = {Christos Bouras and Paul Spirakis and Vasilis Triantafillou and J Garofalakis}
}
@conference {2828,
	title = {An Intranet and Internet based Information System for Administration and Information purposes},
	booktitle = {4th European Digital Cities Conference: Changing patterns of urban life, Salzburg, Austria},
	year = {1998},
	month = {29 - 30 October},
	pages = { 211 - 215},
	abstract = {This work presents a system developed within a project funded by the Greek Government.
The system deals with the distribution of information and the exchange of documents within,
from and towards (region, municipalities, citizens, various groups etc.) the prefecture of
Corfu. It is exploiting Intranet and Extranet technologies in order to enable asynchronous
and synchronous cooperation, manipulation of information from heterogeneous sources,
security and easy administration, providing in parallel advanced communication facilities.},
	author = {Christos Bouras and Vasilis Triantafillou and P Destounis and J Garofalakis and J Tzimas and P Zarafidis}
}
@article {3065,
	title = {Results and experience from the application of a common methodology for Users Requirements Specification in Distance Education using Telematics},
	journal = {Journal of Technology and Teacher Education -JTATE, AACE, Vol. 6, Issue 1},
	year = {1998},
	pages = { 61 - 74},
	abstract = {The cooperation of the Information and Communications Technologies (ICT) and the Educational communities, is
recognised as a necessity that must result in the adaptation and tuning of the education processes in terms of
pedagogical methodologies, school infrastructure, human resources development and organisational restructuring, in
order to efficiently absorb and utilize technological developments. The ICT community has to realize the significance
of the users{\textquoteright} needs, the difficulties of the intervention to an old and traditional process. And the need to view their
technology applications not only as a technical exercise. The initial phases of the TRENDS project, which are
described in this paper, resulted in an agreed common methodology for carrying out the necessary investigation of
the user needs in secondary education. This methodology, which was followed more or less in all participating
countries, produced answers to questions concerning the role of the educators and their basic training, their
familiarity with technology, education policies from a trans-European perspective, the content, forms and aims of
further training, the distance training of teachers in the use of new technologies, the motives, incentives and
organisational schemes for enhancing re-education, the needs of the educational environment and technology-based
training, the needs of the educators in practical didactic methods, etc.},
	author = {Christos Bouras and Paul Spirakis and P Lampsas and G Tsakarissianos and J Garofalakis and K Antonis and N Kastis and S Kontogiannis}
}
@conference {2837,
	title = {Conclusions on the Analysis of User Requirements concerning the use of ICT in the Didactic Process},
	booktitle = {ED-MEDIA/ED-TELECOM 97, Calgary, Canada},
	year = {1997},
	month = {14 - 19 June},
	pages = { 13 - 18},
	abstract = {The co-operation of the Information and Communications Technologies (ICT)
and the Educational Society, is deemed necessary for the adaptation and tuning of the
didactic process in terms of pedagogical methodologies, school infrastructure, human
resources utilisation and organisational restructuring. The use of ICT in the classroom
should be viewed as a highly influencing tool that will support the educators{\textquoteright} effort for
interaction with their students, rather than as a technical exercise. The initial phases of the
TRENDS project, which are described in this paper, resulted in a widely accepted common
methodology, that complies with the international standards for determining the User
Requirements in the Secondary Education. The major results emerged from this survey are
presented here, as well as some common axes that deal with the application of ICT in the
didactic process.},
	author = {Christos Bouras and Paul Spirakis and P Lampsas and G Tsakarissianos and J Garofalakis and K Antonis and N Kastis and S Kontogiannis}
}
@conference {2841,
	title = {The Design and Development of Advanced Network Services over the Patras University Campus Network},
	booktitle = {5th International Conference on Computers in Education-ICCE 97, Sarawak, Malaysia},
	year = {1997},
	month = {2 - 6 December},
	pages = { 420 - 427},
	abstract = {This paper presents some results of the initial phases of a big internal
project running at the University of Patras. In this project - which is co-funded by the
European Union - our team is responsible for the development of the Advanced
Network Services over the Campus Network, which is being established during the
project. In the following chapters we first present the general perspective and the
architecture of the integrated system which offers the set of advanced services to the
University community. We then describe in detail the different services (WWW and
Intranet, On-line teletraining, Computer supported cooperative work, and Off-line
teletraining). A key characteristic of the system is the integration of existing
commercial tools, with tools that we are developing for the specific needs of the
foreseen users. It is evident that this system can be considered as a pilot project for
large and demanding user communities, as is the case with the University of Patras.},
	author = {Christos Bouras and Paul Spirakis and Vasilis Triantafillou and J Garofalakis and J Tsaknakis and J Tzimas and A Tsakalidis and I Antoniou and D Karageorgopoylos and B Basiliadis and P Kappos}
}
@conference {2845,
	title = {A General Performance Model for Multistage Interconnection Networks},
	booktitle = {Euro-Par {\textquoteright}97, Passau, Germany},
	year = {1997},
	month = {25 - 29 August},
	pages = { 993 - 1000},
	abstract = {Multistage Interconnection Networks (MINs) with crossbar
switches are used to interconnect processors and memory modules in
parallel multiprocessor systems. In this paper we analyze the general case
of MINs, made of kk switches with nite, innite or zero length buers
(unbuered). The exact solution of the steady state distribution of the
rst stage is derived for all cases. We use this to get an approximation
for the steady state distributions in the second stage and beyond. In the
case of unbuered switches we reach the known exact solution for all the
stages of the MIN. Our results are validated by extensive simulations.
Keywords: analytical models, queueing theory models, evaluation.},
	author = {Christos Bouras and Paul Spirakis and Vasilis Triantafillou and J Garofalakis}
}
@conference {2859,
	title = {RECPHONE: A new environment for medical remote expert consultation},
	booktitle = {EuroPACS{\textquoteright}91, 9th International Meeting, Berlin, Germany},
	year = {1991},
	month = {2 -3 July},
	pages = { 22 - 23},
	author = {Christos Bouras and Paul Spirakis and J Garofalakis and G Papoutsopoulos and P Basiroglou}
}
@conference {2862,
	title = {Queueing Delays in Buffered Multistage Interconnection Networks},
	booktitle = {ACM SIGMETRICS Conference 1987, Banff, Alberta, Canada},
	year = {1987},
	month = {11 - 14 May},
	pages = { 111 - 121},
	author = {Christos Bouras and Paul Spirakis and Vasilis Triantafillou and J Garofalakis}
}
