• Major Principles on the Design of an Educational Network 

    Bouras, Christos; Fotakis, Dimitris; Katanou, Alexandra; Konidaris, Agisilaos; Kontogiannis, Spyros; Sevasti, Afroditi; Stephanou, Evaggelia (1977-09)
    The modern communication networks, apart from the specialized applications that they offer depending on the nature of their target groups, they support a set of general purpose elementary network services, that provide ...
  • The Transition from Contemporary to Virtual User Interfaces for WebBased Services 

    Bouras, Christos; Konidaris, Agisilaos; Sevasti, Afroditi (1999)
    Computer and Internet based services are increasingly provided to users in our days. The users are also increasing exponentially and it is obvious that they are not experienced in the use of computers. This paper examines ...
  • Using Multimedia to Support Reflection on Past Events for Young Children 

    Bouras, Christos; Kapoulas, Vaggelis; Konidaris, Agisilaos; Sevasti, Afroditi (Association for the Advancement of Computing in Education (AACE), 2000)
    The work presented in this paper focuses on software tools that act as video explorers and annotation platforms and more specifically as diary composers for younger children. Through such tools, children can have as their ...
  • Virtual environments in educational networks 

    Bouras, Christos; Konidaris, Agisilaos; Sevasti, Afroditi (Springer-Verlag US, 2000)
    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 ...
  • e-DEDALUS: A dynamic tool for data publishing on the web 

    Bouras, Christos; Konidaris, Agisilaos; Sintoris, S.; Apostolopoulos, A.; Khan, V. (2000)
    TheWorld WideWeb (WWW) provides a great opportunity for companies and individuals to publish their ideas, products and everything they would like other peo- ple to view. Since the Internet community and the Web are ...
  • Run-time Management Policies for Data Intensive Web sites 

    Bouras, Christos; Konidaris, Agisilaos (2001)
    Web developers have been concerned with the issues of Web latency and Web data consistency for many years. These issues have become more important in our days since the accurate and imminent dissemination of information ...
  • Introducing Navigation Graphs as a Technique for Improving WWW User Browsing 

    Bouras, Christos; Konidaris, Agisilaos; Konidari, Eleni; Sevasti, Afroditi (Springer Berlin Heidelberg, 2001-06)
    In this paper we show that users move from page to page, in the WWW, by following similar browsing patterns when they have similar browsing experience. Similar browsing patterns do not absolutely imply that the same URL’s ...
  • Efficient materialization of dynamic web data to improve web performance 

    Bouras, Christos; Konidaris, Agisilaos (2002)
    The issues of performance, response efficiency and data consistency are among the most important ones for data intensive Web sites on the Internet today. In order to deal with these issues we analyze and evaluate a ...
  • Estimating and eliminating redundant data transfers over the web: a fragment based approach 

    Bouras, Christos; Konidaris, Agisilaos (2002)
    Redundant data transfers over the Web, can mainly be attributed to repeated transfers of unchanged data. Web caches and Web proxies are some of the solutions that have been proposed, to deal with the issue of redundant ...
  • Speeding-up, filtering and manipulating the web to meet specific user needs 

    Bouras, Christos; Konidaris, Agisilaos (2002-12)
    In our days the Web has become a large repository of information. This information is constantly updated and altered. In this work we describe a software architecture that has been used to implement a tool that may ...
  • A Methodology for Calculating the Undetactable Double-Faults in Self-Checking Circuits 

    Nikolaidis, S.; Karaolis, E.; Kakarountas, Athanasios; Papadomanolakis, K.; Goutis, C. E. (World Scientific Publishing Company, 2003)
    In this paper, a methodology for the calculation of the undetectable double-faults in self-checking circuits with bit-sliced architecture is introduced. This methodology is based on a systematic exploration of the combinations ...
  • A novel high-speed counter with counting rate independent of the counter's length 

    Kakarountas, Athanasios P.; Theodoridis, G.; Goutis, Costas E. (IEEE, 2003)
    Counters are among the basic blocks in every digital system. We propose a novel high-speed counter with a constant counting rate, independent of its length. Exploiting special features of the binary arithmetic system and ...
  • Modeling data-intensive web sites for personalization, integrity and performance 

    Bouras, Christos; Konidaris, Agisilaos (IGI Publishing Hershey, PA, USA, 2003)
    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 ...
  • Performance Evaluation of a Hybrid Run-Time Management Policy for Data Intensive Web Sites 

    Bouras, Christos (Kluwer Academic Publishers, 2003-03)
    The issues of performance, response efficiency and data consistency are among the most important for data intensive Web sites. In order to deal with these issues we analyze and evaluate a hybrid run-time management policy ...
  • Efficient Reduction of Web Latency through Predictive Prefetching on a WAN 

    Bouras, Christos; Konidaris, Agisilaos; Kostoulas, Dionysios (Springer Berlin Heidelberg, 2003-08)
    This paper studies Predictive Prefetching on a Web system that provides two levels of caching before information reaches the clients. We analyze prefetching on a Wide Area Network with the above mentioned characteristics. ...
  • The Impact of Low-Power Techniques on the Design of Portable Safety-Critical Systems 

    Kakarountas, Athanasios P.; Spiliotopoulos, Vassilis; Nikolaidis, Spiros; Goutis, Costas E. (Springer-Verlag Berlin Heidelberg, 2004)
    The application of typical low-power techniques on safety-critical systems may result in degradation of crucial safety properties of the system. However, existing techniques to address this impact, considered that low-power ...
  • A Novel Constant-Time Fault-Secure Binary Counter 

    Karatasos, Dimitris; Kakarountas, Athanasios P.; Theodoridis, George; Goutis, Costas (Springer-Verlag Berlin Heidelberg, 2004)
    A novel constant-time fault-secure binary counter is presented. This counter is appropriate for performance aware safety critical systems. This is achieved due its ability to read its binary output on-the-fly. The safety ...
  • Efficient implementation of the keyed-hash message authentication code (HMAC) using the SHA-1 hash function 

    Michail, Harris E.; Kakarountas, Athanasios P.; Goutis, Costas E. (IEEE, 2004)
    In this paper, an efficient implementation, in terms of performance, of the keyed-hash message authentication code (HMAC) using the SHA-1 hash function is presented. This mechanism is used for message authentication in ...
  • A Most Popular Approach of Predictive Prefetching on a WAN to Efficiently Improve WWW Response Times 

    Bouras, Christos; Konidaris, Agisilaos; Kostoulas, Dionysios (Springer Berlin Heidelberg, 2004)
    This paper studies Predictive Prefetching on a Wide Area Network with two levels of caching. The WAN that we refer to is the GRNET academic network in Greece. We rely on log files collected at the network’s Transparent ...
  • Predictive Prefetching on the Web and Its Potential Impact in the Wide Area 

    Bouras, Christos; Konidaris, Agisilaos; Kostoulas, Dionysios (Kluwer Academic Publishers, 2004-06)
    The rapid increase of World Wide Web users and the development of services with high bandwidth requirements have caused the substantial increase of response times for users on the Internet. Web latency would be significantly ...