Panagiotis Kappos

Web site optimization using page popularity

Awkward arrangement of documents in an HTML tree can discourage users from staying at a Web site. The authors have developed an algorithm for dynamically altering the organization of pages at sites where the main design objective is to give users fast access to requested data. The algorithm reads information from the HTTP log file and computes the relative popularity of pages within the site. Based on popularity (defined as a relationship between number of accesses, time spent, and location of the page), the hierarchical relationships between pages are rearranged to maximize accessibility for popular pages.

Improving the performance of Web access by bridging global ranking with local page popularity metrics

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.

Digital robbery; authors are not unprotected

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.

Measuring the mean Web page size and its compression to limit latency and improve download time

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.

Preserving the Greek theatrical heritage: an object oriented multimedia database approach

The authors present the architecture, functionality, and usage of the APOLLON database. APOLLON database is a pilot object oriented multimedia database designed and implemented by the Department of Computer Engineering and Informatics in the University of Patras. The database contains the history of the theatre APOLLON of the city of Patras, one of the most significant theatrical stages in 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 platform for the development and maintenance of multimedia database for the presentation of the Greek theatrical heritage.