Alex Vakaloudis

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The composition of 3D presentations is a complicated procedure partly facilitated by the introduction of VRML. VRML does not yet support 3D object storage and querying thus introducing limitations to object reusability. Presentations have to be built from scratch while the necessary information exists already from previous work. This paper presents a method(More)
Despite the number of proposals for processing 2D spatial data, the areas of 3D modelling and querying are quite empty. Moreover, only few attempts appear towards incorporating the temporal and the 3D spatial domains. At the same time the vast growth of Internet and WWW has set a new domain for applications. One of the most promising Web-browser plug-ins is(More)
This paper presents a study on the expansion of urban Wi-Fi networks and the degree of users' awareness about their characteristics. It involves an experiment contacted at the area of Serres, a Greek city of around 70,000 inhabitants. The findings revealed that although the number of Wi-Fi networks is quite high, their owners are unaware of their technical(More)
The introduction of VRML has facilitated the production of virtual worlds. Apart from being a format for defining 3D geometries, VRML also provides the foundation for specifying interactive behaviour. However this mechanism is rather primitive, there is no direct modelling for composite events or conditions and no efficient treatment of time. The approach(More)
Cloud Computing is currently one of the most widely-spoken terms in IT. While it offers a range of technological and financial benefits, its wide acceptance by organizations is not yet wide spread. Security concerns are a main reason for this and this paper studies the data and network threats posed in both traditional and cloud paradigms in an effort to(More)
Despite the number of proposals for processing 2D spatial data, the areas of 3D spatial information is still quite empty. Moreover, only few attempts appear towards incorporating the temporal and the 3D spatial domains. At the same time the vast growth of Internet and WWW has set a new domain for applications. One of the most promising Web browser plug-ins(More)