Christos Bouras

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1Department of Biophysical and Electronic Engineering, University of Genoa, Via Opera Pia 11a, 16145 Genoa, Italy 2Computer Vision & Graphics, Image Processing Department, Heinrich-Hertz-Institute Berlin, Fraunhofer-Institute for Telecommunications, 10587 Berlin, Germany 3R&D Department, Exent Technologies Ltd., 25 Bazel Street, P.O. Box 2645, Petach Tikva(More)
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 reduced, if browser, proxy or Web server software could make predictions about the pages that a user is most likely to request next,(More)
The use of collaborative virtual environments in e-learning is one of the most promising uses of virtual reality technology. While much research has been done in the area of networked virtual environments corresponding to the sharing of events, very little research has been done on specific services and functionality. However both the requirements and the(More)
This paper proposes a mechanism for the congestion control for video transmission over universal mobile telecommunications system (UMTS). Our scheme is applied when the mobile user experiences real-time multimedia content and adopts the theory of a widely accepted rate control method in wired networks, namely equation-based rate control. In this approach,(More)
Long Term Evolution (LTE) networks offer high capacity and are specified and designed to accommodate small, high performance, power-efficient end-user devices. One limiting factor that influences LTE performance is the interference from neighbouring cells, the so called Inter-Cell Interference (ICI). The investigation of ICI mitigation techniques has become(More)
In this paper, we present the design and implementation of a VRML97 multi-user layer, which is introduced in the EVE distributed virtual reality platform. Though other approaches use a VRML node insertion mechanism, such as VSPLUS, or a substitution mechanism, such as SPIN-3D, our approach uses a removal mechanism. Main consideration of our multi-user(More)
Long Term Evolution (LTE) constitutes the latest step before the 4th generation (4G) of radio technologies designed to increase the capacity and speed of mobile communications. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers the possibility to transmit Multimedia Broadcast multicast service over a Single Frequency Network (MBSFN),(More)
An Educational Virtual Environment (EVE) is an instance of a Collaborative Virtual Environment (CVE), which focalises in providing collaborative, as well as educational, functionalities, such as synchronous and asynchronous e-learning services. This paper describes such an educational virtual community, which aims to meet the requirements of a virtual(More)
In this paper, we present a modification of the ns2 code for the RTP/RTCP protocols. The legacy RTP/RTCP code in ns2 has not yet been validated but it provides a framework of the protocol’s specification for experimental use. We have modified the code by adding all the RTP/RTCP protocol’s attributes that are defined in RFC 3550 and related to QoS metrics.(More)
In an era that, searching the WWW for information becomes a tedious task, it is obvious that mainly search engines and other data mining mechanisms need to be enhanced with characteristics such as NLP in order to better analyze and recognize user queries and fetch data. We present an efficient mechanism for stemming and tagging for the Greek language. Our(More)