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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： A.A. AbuBaker R.S. Qahwaji M.J. Aqel M.H. Saleh School of Informatics University of Bradford Bradford West Yorkshire UK EMIC school of Informatics University of Bradford Bradford West Yorkshire UK University of Bradford Bradford West Yorkshire UK Electrical and Computer Engineering Department University of Applied Science University Jordan

Two novel threshold techniques are proposed for image segmentation which is a very critical task in any image processing. The two methods are based in scanning each image row by row and to find the proper threshold value. A modification of this method is developed to find the threshold value by average. The two methods are implemented on a mammogram and accordingly, a comparison between the two methods is carried out

关键词： Image segmentation Entropy Histograms Image processing Image edge detection informatics Digital images Image analysis Neural networks Fuzzy neural networks

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A new tree based call admission control for wireless networks

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WSEAS Transactions on Systems 2006年第3期5卷 504-509页

作者： Ioannou, K. Pylarinos, J. Louvros, S. Panoutsopoulos, I. Kougias, I. Garmpis, A. Kotsopoulos, S. Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Department of Communications Systems and Networks Technological Educational Institution of Messolonghi Nafpaktos 30300 Greece Department of Applied Informatics in Management and Economy Technological Educational Institution of Messolonghi Messolonghi 30100 Greece

Microcellular solutions in wireless networks increase the network traffic control as a result of frequent handover behavior. This paper proposes a two layer wireless call admission control to optimize the forced termi... 详细信息

关键词： Wireless telecommunication systems

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Experimental performance evaluation of the emerging WiMAX technology

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WSEAS Transactions on Information Science and Applications 2006年第2期3卷 322-327页

作者： Agapiou, G. Vali, D. Charalambakis, D. Georgiadis, P. Plakidis, E. Rorris, P. Ioannou, K. Garmpis, A. Mobile and Radio Communications Research Laboratories OTE S.A. Athens Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece

The increasing demand for wireless broadband service offering in long distances is the major drive behind the emergence of the WiMAX technology. WiMAX is targeted to providing high bit data rates to the end users in a wireless manner, any time, in any location, even in harsh environmental conditions and at an acceptable quality. This paper presents the experimental results of a WiMAX system that follows the specifications of IEEE 802.16-2004 standard. Throughput and Bit Error Rate (BER) measurements, as well as voice and video service experiments are carried out, leading to useful conclusions for the performance evaluation of the WiMAX system under test and the WiMAX technology in general.

关键词： Wireless telecommunication systems

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Throughput and interference measurements in copper wires of xDSL type modems

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WSEAS Transactions on Information Science and Applications 2006年第2期3卷 352-357页

作者： Agapiou, G. Doukoglou, T. Georgiadis, P. Georgakopoulos, G. Plakidis, E. Rorris, P. Ioannou, K. Ioannou, A. Garmpis, A. Mobile and Radio Communications Research Laboratories OTE S.A. Athens Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Department of Applied Informatics in Management and Economy Technical Education Institute of Messologi Messologi Greece

Crosstalk is an important factor that needs to be considered and study its effects in copper wires, especially when voice communication takes place. Its presence has proven to be an impaired factor in the performance of communication services. This paper measures the isolation losses and the crosstalk losses as a function of the frequency and the length of the copper wires. It also presents throughput results from modems designed in the context of an EU financed project that can provide a symmetric 100 Mbps over two pairs for reach up to 500m (5 times the existing reach of 100-BASE-T systems).

关键词： Modems

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Low HRV entropy is strongly associated with myocardial infarction

Low HRV entropy is strongly associated with myocardial infar...

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作者： Lau, Stephan Haueisen, Jens Schukat-Talamazzini, Ernst G. Voss, Andreas Goernig, Matthias Leder, Uwe Figulla, Hans-R. Institute of Computer Science Friedrich Schiller University Jena Jena Germany Biomagnetic Center Jena Friedrich Schiller University Jena Jena Germany Department of Medical Engineering University of Applied Sciences Jena Jena Germany Institute of Biomedical Engineering and Informatics Technical University of Ilmenau Ilmenau Germany Clinic of Internal Medicine I Friedrich Schiller University Jena Jena Germany Biomagnetic Center Jena Friedrich Schiller University Jena Erlanger Allee 101 07747 Jena Germany

Heart rate variability (HRV) is a marker of autonomous activity in the heart. An important application of HRV measures is the stratification of mortality risk after myocardial infarction. Our hypothesis is that the information entropy of HRV, a non-linear approach, is a suitable measure for this assessment. As a first step, to evaluate the effect of myocardial infarction on the entropy, we compared the entropy to standard HRV parameters. The entropy was estimated by compressing the tachogram with Bzip2. For univariate comparison, statistical tests were used. Multivariate analysis was carried out using automatically generated decision trees. The classification rate and the simplicity of the decision trees were the two evaluation criteria. The findings support our hypothesis. The meanNN-normalized entropy is reduced in patients with myocardial infarction with very high significance. One entropy parameter alone exceeds the discrimination strength of multivariate standards-based trees. ©2006 by Walter de Gruyter.

关键词： Cardiology

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Variable Forgetting Factor-Based Friction Compensation Method of Precision Stages

Variable Forgetting Factor-Based Friction Compensation Metho...

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SICE Annual Conference

作者： Shigeki Goka Seiji Hashimoto Kiyoshi Ohishi Takeo Ishikawa Shuichi Adachi Koji Kosaka Hiroshi Kubota Tadahiro Ohmi Department of Electronic Engineering Gunma University Gunma Japan Department of Electrical Engineering Nagaoka University of Technology Niigata Japan Department of Applied Physics and Physico-Informatics Keio University Kanagawa Japan Tech Concierge Kumamoto Kumamoto Japan Department of Electrical and Computer Engineering Kumamoto University Kumamoto Japan Future Information Industry Creation Center University of Tohoku Miyagi Japan

This paper presents the nonresonant ultrasonic motor (SPIDER)-driven precision stage control based on an adaptive identification method with a variable forgetting factor (VFF). SPIDER-driven stage has a strong non-linearity due to the frictional drive mechanism. Focusing on the VFF, dynamical change of frictional property is detected. Therefore, fast and precise friction compensation can be performed based on the VFF. The validity of both the identification and compensation methods is verified through experiments

关键词： Friction Leg Electronics industry Actuators Position measurement Industrial electronics Physics computing computer industry Industrial control Electric variables control

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Building a multimedia next generation network

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WSEAS Transactions on Communications 2006年第2期5卷 225-230页

作者： Raptis, L. Kagklis, D. Patikis, Y. Hatzilias, G. Zervos, N. Zahariadis, T. Crhonis, D. Ioannou, K. Garmpis, A. Department of Electrical Engineering and Computer Science National Technical University of Athens 9 Heroon Polytechniou 15773 Zographou Athens Greece Ellemedia Technologies Ltd. 223 Syggrou Av. GR-17121 Athens Greece Hellenic Telecommunications Organization S.A. 99 Kifissias Ave. 151 24 Athens Greece Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece Department of Applied Informatics in Management and Economy Technological Educational Institution of Messolonghi Messolonghi 30100 Greece

The last years, the voice and the Internet access services have become a commodity, having as a result the offering from network providers, both fixed and mobile, a bunch of services. These developments are posing new requirements to existing networks, which are circuit based, and an evolution path is needed towards next generation networks, which allows the provision of multimedia services with guarantee quality of service. Mobile operators are facing the greatest challenges, since they have to reform their networks in order to provide data and multimedia services and the definition of the IP multimedia Subsystem (IMS) framework is one step towards that direction. The purpose of this paper is to shed light on significant issues, in terms of network architecture and protocols of multimedia next generation networks,,allowing the definition of an evolution scenario of existing networks towards next generation multimedia networks.

关键词： Telecommunication services

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Efficient SIE/VIE scattering analysis of ferroelectric inhomogeneous materials with high permittivity for microwave applications

Efficient SIE/VIE scattering analysis of ferroelectric inhom...

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European Conference on Antennas and Propagation, EuCAP

作者： Georgios K. Avdikos Theodore Zervos Hristos T. Anastassiu Nikolaos K. Uzunoglu School of Applied Mathematics and Physics National and Technical University of Athens Zografou Greece National Centre for Scientific Research Demokritos Institute of Informatics and Telecommunications Athens Greece Communications and Networks Design & Development Department Hellenic AeroSpace Industry SA Viotia Greece School of Electrical and Computer Engineering National and Technical University of Athens Zografou Greece

Ferroelectric materials have been gaining much interest over the last decades due to the unique operational characteristics they demonstrate, when a dc electric field is applied. This paper investigates the scattering analysis of electromagnetic waves from materials with high permittivity that follows a linear spatial variation along one axis. The surface integral equation (SIE) and volume integral equation (VIE) methods are invoked to compute the currents and the radar cross section (RCS). The number of unknowns for the VIE is, as expected, larger than for the SIE method. The RCS and the induced current are associated in such a way that one can approximate the linear variation with relatively few elements (unknowns).

关键词： Ferroelectric materials Permittivity Electromagnetic scattering Radar scattering Integral equations Electromagnetic analysis Radar cross section Linear approximation Dielectric materials Microwave antenna arrays

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An architecture for mobile-health care service provision

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WSEAS Transactions on computers 2005年第11期4卷 1502-1509页

作者： Votis, K. Vassiliadis, B. Tsaknakis, J. Stefani, A. Ioannou, K. Drossos, L. Dept. of Computer Engineering and Informatics University of Patras Patras Greece Department of Computer Science Hellenic Open University Greece Dept. of Electrical and Computer Engineering University of Patras Patras Greece Dept. of Applied Informatics in Management and Economy Technical Education Institute of Messologi Greece

This paper introduces the architecture of an open information and communication platform that integrates all relevant participants in health and social sector. The main concept of the proposed platform is based on concept introduced by new computing paradigms and the need of transformation of the existing internetworking and web technologies into a human resource pool that will be accessible by anyone, at anytime, and from everywhere in support of their needs. This platform intends to create the essential infrastructure for the provisioning of health and social services to individuals that receive residential care using Peer-to-Peer (P2P) networks over Internet, GSM and PSTN networks. The use of new computing models such as Service-Oriented computing, Grid, P2P and argumentation technologies are discussed. Furthermore, the functional requirements and the architecture of a complete solution are presented.

关键词： Intelligent agents

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Embedding advanced geometric techniques into SQL for efficient indexing of mobile objects

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WSEAS Transactions on computers 2005年第11期4卷 1517-1525页

作者： Sioutas, S. Drossos, L. Tsolis, D. Papatheodorou, T.S. Computer Engineering and Informatics Department University of Patras Building B University Campus 26500 Rion Patras Greece Technological Institute of Messolongi Department of Applied Informatics in Administration and Economics Technological Institute Campus 30200 Messolongi Greece

It is of great importance a trial to embed new geometric techniques into SQL in order to achieve more efficient indexing of objects moving on the plane and answer range queries about their future positions. This problem is motivated by real-life applications, such as allocating more bandwidth for areas where high concentration of mobile phones is imminent, or predicting future congestion areas in a highway Geographic Information System (GIS). We consider the problem in the external memory model of computation and present a variety of dynamic techniques.

关键词： Computational geometry

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