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European Conference on Antennas and Propagation, EuCAP

作者： T. Zervos A. Alexandridis K. Peppas F. Lazarakis K. Dangakis C. Soras B. Lindmark Department of Electrical & Computer Engineering University of Patras Patras Greece Institute of Informatics & Telecommunications National Centre for Scientific Research Athens Greece Department of Signals Sensors and Systems Royal Institute of Technology Stockholm Sweden

In this paper the impact of user's hand holding a multiple-input-multiple-output (MIMO) terminal on the system performance is investigated. A 4times4 MIMO system is considered with a personal digital assistant (PDA) terminal equipped with a compact array of 4 patch elements. The radiation patterns of the antenna elements are simulated in the presence of the other elements and in the presence of a user's hand. The obtained patterns are used to evaluate the covariance matrix of the receive antenna which is incorporated in a correlation-based MIMO channel model. MIMO channel capacity is calculated to demonstrate the capacity degradation caused by the user's hand.

关键词： MIMO Channel capacity Personal digital assistants Antenna radiation patterns Mobile antennas System performance Impedance Biological tissues Humans Frequency

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Efficient Channel Assignment technique providing priority to Emergency Calls in Wireless Cellular Security Networks

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WSEAS Transactions on Communications 2006年第1期5卷 84-91页

作者： Ioannou, K. Dimitriadou, E. Ioannou, A. Panoutsopoulos, I. Garmpis, A. Kotsopoulos, S. Wireless Telecommunication Laboratory Department of Electrical and Computer Engineering University of Patras Rion 26500 Patras Greece OTE S.A. Messolonghi 30200 Greece Department of Applied Informatics in Management and Economy Technological Educational Institution of Messolonghi Messolonghi 30200 Greece

In this paper is presented a new efficient Channel Assignment technique. The philosophy of this technique is that provides priority to Emergency Calls in Wireless Cellular Security Networks. The new technique is based on a two-layer cellular architecture The lower layer of the proposed architecture is based on a microcellular solution, for absorbing the traffic loads of both the handoff and new calls of Emergency Calls (EC). The higher layer is based on a macro-cell umbrella solution, for absorbing the traffic load of the handoff and new calls of the Non Emergency Calls (NEC). The simulation results show that using the optimum number of channels in each layer, the QoS of EC and the Handoff Blocking Probability of NEC in a congested area where an extreme event was happened is optimized, having the minimum negative effect on the New Call Blocking Probability of the NEC.

关键词： Wireless telecommunication systems

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ROBUST STABILITY CHECKING OF A CLASS OF LINEAR INTERVAL FRACTIONAL ORDER SYSTEM USING LYAPUNOV INEQUALITY

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IFAC Proceedings Volumes 2006年第11期39卷 89-94页

作者： Hyosung Ahn YangQuan Chen Igor Podlubny Center for Self-Organizing and Intelligent Systems (CSOIS) Department of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 USA Department of Applied Informatics and Process Control Technical University of Kosice B. Nemcovej 3 04200 Kosice Slovak Republic

This paper provides a new analytical robust stability checking method of fractional-order linear time invariant interval uncertain system. This paper continues the authors’ previous work (Chen et al., 2005a) where matrix perturbation theory was used. For the new robust stability checking, Lyapunov inequality is utilized for finding the maximum eigenvalue of a Hermitian matrix. Through numerical examples, the usefulness and the effectiveness of the newly proposed method are verified.

关键词： Fractional order linear dynamic systems robust stability interval linear time invariant systems interval matrix

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Automated tracking and modeling of microtubule dynamics

Automated tracking and modeling of microtubule dynamics

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IEEE International Symposium on Biomedical Imaging

作者： M. Saban A. Altinok A. Peck C. Kenney S. Feinstein L. Wilson K. Rose B.S. Manjunath Center for Bio-image Informatics Department of Electrical and Computer Engineering University of California슠Santa Barbara Santa Barbara CA USA Center for Bio-image Informatics Department of Computer Science University of California슠Santa Barbara Santa Barbara CA USA Center for Bio-image Informatics Department of Molecular Cellular and Developmental Biology University of California슠Santa Barbara Santa Barbara CA USA

The method of microtubule tracking and dynamics analysis, presented here, improves upon the current means of manual and automated quantification of microtubule behavior. Key contributions are increasing accuracy and data volume, eliminating user bias and providing advanced analysis tools for the discovery of temporal patterns in cellular processes. By tracking the entire length of each resolvable microtubule, as opposed to only the tip, it is possible to boost dynamics studies with positional information that is virtually impossible to collect manually. We demonstrate the method on the analysis of a microtubule dataset, which was manually tracked and analyzed in the study of betaIII-tubulin isoform. Our results show that automated recognition of temporal patterns in cellular processes offers a highly promising potential

关键词： Biological system modeling Cells (biology) Microscopy informatics Biology computing Proteins Videos Fluorescence Machine learning Interference constraints

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Average Row Thresholding Method for Mammogram Segmentation

Average Row Thresholding Method for Mammogram Segmentation

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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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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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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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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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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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Local Learning and Search in Memetic Algorithms

Local Learning and Search in Memetic Algorithms

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Congress on Evolutionary Computation

作者： F.G. Guimaraes E.F. Wanner F. Campelo R.H.C. Takahashi H. Igarashi D.A. Lowther J.A. Ramirez Department of Electrical Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil Research Group of Informatics for System Synthesis Graduate School of Information Science and Technology Hokkaido University Sapporo Japan Department of Mathematics Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil Department of Electrical and Computer Engineering McGill University Montreal Canada

The use of local search in evolutionary techniques is believed to enhance the performance of the algorithms, giving rise to memetic or hybrid algorithms. However, in many continuous optimization problems the additional cost required by local search may be prohibitive. Thus we propose the local learning of the objective and constraint functions prior to the local search phase of memetic algorithms, based on the samples gathered by the population through the evolutionary process. The local search operator is then applied over this approximated model. We perform some experiments by combining our approach with a real-coded genetic algorithm. The results demonstrate the benefit of the proposed methodology for costly black-box functions.

关键词： Evolutionary computation Employment Sampling methods Cost function Genetic algorithms Mathematics informatics Information science Design optimization Design automation

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