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Web traffic is doubling every year, according to recent global studies. The user needs more information from Web sites and wants to spend as little time for downloading as possible. Simultaneously, more Internet bandwidth is needed and all ISPs are trying to build high bandwidth networks. This paper presents a case study that calculates the reduction of the time needed for a Web page to be fully downloaded and delivered to the user. Presents a way to calculate the reduction of data transfer, bandwidth resources and response time when the HTTP/1.1's compressing feature is enabled (either in plain hypertext files or the text output of CGI programs or dynamically generated pages). Measurements are taken from five popular Web sites in order to validate our statement for reduction in transfer time. The definition of the mean size of a Web page that commercial Web sites have is additionally in the scope of this paper.

Considers the problem of improving the performance of Web access by proposing a reconstruction of the internal link structure of a Web site in order to match the quality of the pages (measured in terms of their link importance in the Web space ± global ranking) with the popularity of the pages (measured in terms of their importance recognized by Web users ± local metrics). Provides a set of simple algorithms for local reorganization of a Web site, which results in improving users' access to quality pages in an easy and quick way.

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The growth of networked systems has magnified the use of raw resources such as images, animations, videos, etc. The networking facilities between different systems and the lack of security between them have introduced the need for image, animation and video copyright protection. One approach used to address this problem is the use of structure that can seal or mark any digital material. These structures are called watermarks. In this paper, we present different solutions, commercial, freeware or scientific, for the marking of multimedia objects.

In this paper we present the architecture, the functionalic and the usage of the APOLLON database. APOLLON database is a pilot object oriented multimedia database designed and implemented by the Department of Computer Engineering and Injormatics in the University of Patras. The database contains the histon of the theatre APOLLON of the city of Patras, one of the most significant theatrical stages in the Western Greece with a history of two hundred years. The application based on an object-oriented approach aims in the adoption of a common object oriented multimedia platfonn for the development and maintenance of multimedia database for the preservation of the Greek theatrical heritage.