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2nd IET International Conference on Intelligent Environments, IE 06

作者： Petrellis, Nikos Konofaos, Nikos Alexiou, George Computer Engineering and Informatics Dept. Research Academic Computer Technology Institute University of Patras Greece

ISBN: (纸本)0863416632

In this paper we present a system that is capable of estimating the position of a moving target on a grid plane covered by a pair of infrared transmitters. The area of this plane can be up to 15m2, further expandable if multiple transmitters are used. The position estimation method is based on comparing the number of infrared patterns received to the expected ones in a specific time interval (success rate). Using this method, no signal strength or time of flight has to be precisely measured, leading to an ultra low cost architecture. A proper topology of the infrared transmitters that optimally cover the desired area is discussed. The history of movements of the target is utilized in order to reject false estimations. The error achieved is below the half of the grid node distance.

关键词： Feature extraction

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Evaluating different one to many packet delivery schemes for UMTS 06

Evaluating different one to many packet delivery schemes for...

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WoWMoM 2006: 2006 International Symposium on a World of Wireless, Mobile and Multimedia Networks

作者： Alexiou, Antonios Antonellis, Dimitrios Bouras, Christos Research Academic Computer Technology Institute Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)0769525938

It is known that multicasting is an efficient method of supporting group communication as it allows the transmission of packets to multiple destinations using fewer network resources. Thus, service providers are increasingly interested in supporting multicast communications over wireless networks and in particular over UMTS. Multicasting is a more efficient method of supporting group communication than unicasting or broadcasting, as it allows transmission and routing of packets to multiple destinations using fewer network resources. In this paper the three above mentioned methods of supporting group communication are analyzed in terms of their performance. © 2006 IEEE.

关键词： Packet networks

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Design aspects of open municipal broadband networks 06

Design aspects of open municipal broadband networks

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1st International Conference on Access Networks, AcessNets '06

作者： Alexiou, Antonios Bouras, Christos Primpas, Dimitrios Research Academic Computer Technology Institute Computer Engineering and Informatics Dept. Univ. of Patras N. Kazantzaki Str 26500 Rio Greece

ISBN: (纸本)1595935134

This paper presents the design principles that cover the implementation of broadband infrastructure in the region of Western Greece, by examining all the necessary parameters that arise while implementing such a critical developmental project. Furthermore, we present as a case study, all issues of the designing of the Metropolitan Area Network of Patras, the third biggest city of Greece. The major target of the MAN of Patras is to interconnect the buildings of the public sector in the city and also deploy fibers that will create conditions of competition in providing both access and content services in advantage of the end consumer. The usage of the broadband infrastructure by service providers will be based on the open availability of the fiber optics infrastructure in a cost effective way. Finally, we present the main characteristics of a proposed business plan that ensures financial viability of the broadband infrastructure. Copyright 2006 ACM.

关键词： Broadband networks

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Dynamic resource management using bandwidth brokers

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Journal of Systems engineering and Electronics 2006年第3期17卷 660-668页

作者： Yu Chengzhi Song Hantao Hou Xianjun Pan Chengsheng Dept. of Computer Science and Engineering School of Information Science and Technology Beijing Inst. of Technology Beijing 100081 P. R. China Shenyang Inst. of Technology Shenyang 110168 P. R. China

The admission control issue in the design of a centralized bandwidth broker model for dynamic control and management of QoS provisioning is studied. A two-phase differentiated flow treatment based dynamic admission control scheme under the centralized bandwidth broker model is proposed. In the proposed scheme, the flow requests are classified into two classes and get differentiated treatment according to their QoS demands. We demonstrate that this admission control scheme can not only improve the resource utilization but also guarantee the flows＇ QoS. Furthermore, the admission control is divided into two phases： edge admission control and interior admission control. During the interior phase, the PoQ scheme is adopted, which enhances the call processing capability of the bandwidth broker. The simulation results show that the proposed scheme can result in lower flow blocking probability and higher resource utilization. And it also reduces the number of QoS state accesses/updates, thereby increasing the overall call processing capability of the bandwidth broker.

关键词： admission control quality of services bandwidth broker.

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A paradigm for wireless digital audio home entertainment

A paradigm for wireless digital audio home entertainment

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120th Convention Spring Preprints 2006

作者： Kokkos, Nikos Floros, Andreas Tatlas, Nicolas-Alexander Mourjopoulos, John Electrical Engineering and Computer Technology Department Audio and Acoustic Technology Group University of Patras 26500 Greece Dept. of Informatics Ionian University 49100 Corfu Greece

ISBN: (纸本)9781604235975

Despite recent advances in wireless networking technology, real-time streaming of CD-quality digital audio remains a challenging topic. In this work, a set of applications following the server-client model was developed, facilitating the transmission and playback of PCM-coded audio over wireless links. The implementation is based on typical Personal computer (PC) platforms interconnected with off-the-shelf wireless networking hardware. Performance evaluation tests are presented under different networking parameters and link conditions, leading to an optimal set of parameters for high-quality wireless digital audio delivery.

关键词： Personal computers

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Causal association rule mining methods based on fuzzy state description

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Journal of Systems engineering and Electronics 2006年第1期17卷 193-199页

作者： Liang Kaijian Liang Quan Yang Bingru Dept. of Computer Hunan Inst. of Engineering Xiangtan 411101 P. R. China School of Information and Engineering Univ. of Science and Technology Beijing Beijing 100083 P. R. China

Aiming at the research that using more new knowledge to develope knowledge system with dynamic accordance, and under the background of using Fuzzy language field and Fuzzy language values structure as description framework, the generalized cell Automation that can synthetically process fuzzy indeterminacy and random indeterminacy and generalized inductive logic causal model is brought forward. On this basis, a kind of the new method that can discover causal association rules is provded. According to the causal information of standard sample space and commonly sample space, through constructing its state （abnormality） relation matrix, causal association rules can be gained by using inductive reasoning mechanism. The estimate of this algorithm complexity is given,and its validiw is proved through case.

关键词： knowledge discovery language field language value structure generalized cell automation generalized inductive logic causal model causal association rule.

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Mertacor: A successful autonomous trading agent 06

Mertacor: A successful autonomous trading agent

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Fifth International Joint Conference on Autonomous Agents and Multiagent Systems, AAMAS

作者： Toulis, Panos Kehagias, Dionisis Mitkas, Pericles A. Aristotle University of Thessaloniki Dept. of Electrical and Computer Engineering 54124 Thessaloniki Greece Centre for Research and Technology Hellas Informatics and Telematics Institute 57001 Thermi Greece

ISBN: (纸本)1595933034

In this paper we present the internal architecture and bidding mechanisms designed for Mertacor, a successful trading agent, which ended up first in the Classic Trading Agent Competition (TAC) of 2005. TAC provides a realistic benchmarking environment in which different trading agents compete with each other in order to best satisfy their clients' preferences and maximize their total profit. The "travel game" scenario of TAC involves three types of auctions;a) continuous one-sided that sell flight tickets, b) ascending multi-unit auctions for booking hotel rooms, and c) continuous double auctions for entertainment tickets. For each one of these types, we describe the techniques deployed by Mertacor. In flight auctions prices are updated according to a random walk process, thus the accurate prediction of the next update is not feasible. A key element of agent behavior in these auctions is its ability to accurately deduce the specific time in an auction, at which bidding will be profitable. In order to deal with the uncertainty due to price fluctuations in flight auctions and to provide our agent with an efficient decision mechanism, we have designed the z-heuristic framework. The goal of z-heuristic is to figure out when the price assumes its minimum value and recommend bidding at that moment. In the case of hotel auctions, Mertacor used fuzzy reasoning in conjunction with rule-based reasoning in order to predict the closing prices of hotel rooms, when historical data from past auctions are available. In order to bid efficiently in entertainment auctions, we have designed a bidding strategy whose goal is to preserve a pre-specified long-term profit. We finally present and discuss the results of agent benchmarking in the TAC Classic game. Copyright 2006 ACM.

关键词： Autonomous agents

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JPEG2000 steganography possibly secure against histogram-based attack

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PCM 2006: 7th Pacific Rim Conference on Multimedia

作者： Noda, Hideki Tsukamizu, Yohsuke Niimi, Michiharu Kyushu Institute of Technology Dept. of Systems Innovation and Informatics 680-4 Kawazu Iizuka 820-8502 Japan Kyushu Institute of Technology Dept. of Electrical Electronic and Computer Engineering 1-1 Sensui-cho Tobata-ku Kitakyushu 804-8550 Japan

ISBN: (纸本)3540487662

This paper presents two steganographic methods for JPEG2000 still images which preserve histograms of discrete wavelet transform (DWT) coefficients. The first one is a histogram quasi-preserving method using quantization index modulation (QIM) with a dead zone in DWT domain. The second one is a histogram preserving method based on histogram matching using two quantizers with a dead zone. Comparing with a conventional JPEG2000 steganography, the two methods show better histogram preservation. The proposed methods are promising candidates for secure JPEG2000 steganography against histogram-based attack. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Image compression

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Predicting the perceived quality of a first person shooter: The Quake IV G-model 06

Predicting the perceived quality of a first person shooter: ...

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5th ACM SIGCOMM Workshop on Network and System Support for Games, NetGames '06

作者： Wattimena, A.F. Kooij, R.E. Van Vugt, J.M. Ahmed, O.K. TNO Information and Communication Technology Brassersplein 2 2600 GB Delft Netherlands Vrije Universiteit Faculty of Sciences Business Mathematics and Informatics Amsterdam Netherlands Delft University of Technology Dept. of Electrical Engineering Mathematics and Computer Science Mekelweg 4 2628 CD Delft Netherlands

ISBN: (纸本)1595935894

This paper describes the development of an end-to-end quality measurement method that allows us to quantify the perceived quality of Interactive Gaming, with an emphasis on the so-called First Person Shooter (FPS) game Quake IV. We conducted a number of subjective experiments to quantify the impact of network parameters on the perceived quality of this recent FPS game. Making use of a multi-dimensional regression analysis we developed the Quake IV G-model which enables us to predict a gamer's Quake IV quality rating (expressed in a Mean Opinion Score) based on measured ping and jitter values. Our G-model shows a very high correlation (R = 0.98) with the subjective data. Copyright 2006 ACM.

关键词： Regression analysis

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Mobile mapping for the automated analysis of road signage and delineation 13

Mobile mapping for the automated analysis of road signage an...

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13th World Congress on Intelligent Transport Systems and Services, ITS 2006

作者： McLoughlin, Simon Deegan, Catherine Fitzgerald, Conor Markham, Charles Dept. of Computer Science National University Ireland Maynooth I-Kildare Ireland School of Informatics and Engineering Institute of Technology Blanchardstown I-Dublin-15 Ireland Tramore House Regional Design Office Tramore House Tramore Waterford Ireland

This paper presents a mobile and portable stereo vision system designed for the assessment of road signage and delineation (lines and reflective pavement markers or "cat's eyes"). This novel system allows both geometric and photometric measurements to be made on objects in a scene. Any objects examined can then be accurately positioned on a National grid through the fusion of stereo vision with GPS technology. Automated feature extraction and analysis routines have also been developed to make the system fully autonomous.

关键词： Stereo vision

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