TY - CONF T1 - The Performance of Simple Queueing Theoretic Video On Demand Algorithms T2 - APPLIED INFORMATICS (AI 2000), Innsbruck, Austria Y1 - 2000 A1 - Christos Bouras A1 - J Garofalakis A1 - J Tzimas A1 - P Petridis AB - 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. JF - APPLIED INFORMATICS (AI 2000), Innsbruck, Austria ER - TY - JOUR T1 - A Cooperative Environment for Local Government: An Internet – Intranet Approach JF - Journal of Telematics and Informatics, Elsevier Science, Vol. 16, Issue 1-2 Y1 - 1999 A1 - Christos Bouras A1 - Vasilis Triantafillou A1 - P Destounis A1 - J Garofalakis A1 - J Tzimas A1 - P Zarafidis AB -

In this paper we present a Web-based, database oriented CSCW system to support information dispersal between di€erent Local Government authorities (Region, Prefecture and Municipalities) and the citizens. The system is implemented around the `shared workspace' notion, a group of directories and ®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 ecient distribution and management of information between and within di€erent types of local authorities (Municipalities, Prefectures).

ER - TY - CONF T1 - Cooperative Information Systems over the Internet and the WWW T2 - EUROMEDIA 99-APTEC, Munich, Germany Y1 - 1999 A1 - Christos Bouras A1 - Vasilis Triantafillou A1 - P Destounis A1 - J Garofalakis A1 - J Tzimas A1 - P Zarafidis AB - 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). JF - EUROMEDIA 99-APTEC, Munich, Germany ER - TY - CONF T1 - An Intranet and Internet based Information System for Administration and Information purposes T2 - 4th European Digital Cities Conference: Changing patterns of urban life, Salzburg, Austria Y1 - 1998 A1 - Christos Bouras A1 - Vasilis Triantafillou A1 - P Destounis A1 - J Garofalakis A1 - J Tzimas A1 - P Zarafidis AB - 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. JF - 4th European Digital Cities Conference: Changing patterns of urban life, Salzburg, Austria ER - TY - CONF T1 - The Design and Development of Advanced Network Services over the Patras University Campus Network T2 - 5th International Conference on Computers in Education-ICCE 97, Sarawak, Malaysia Y1 - 1997 A1 - Christos Bouras A1 - Paul Spirakis A1 - Vasilis Triantafillou A1 - J Garofalakis A1 - J Tsaknakis A1 - J Tzimas A1 - A Tsakalidis A1 - I Antoniou A1 - D Karageorgopoylos A1 - B Basiliadis A1 - P Kappos AB - 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. JF - 5th International Conference on Computers in Education-ICCE 97, Sarawak, Malaysia ER -