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Estimation of a partial transmitter contribution to the total electromagnetic field exposure, in a multi-transmitter environment

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WSEAS Transactions on Communications 2007年第5期6卷 675-682页

作者： Stratakis, D. Miaoudakis, A. Farsaris, N. Xenos, T. Zacharopoulos, V. Applied Informatics and Multimedia Department Technological Educational Institute of Crete Electromagnetic Radiation Measurements Laboratory 71004 Heraklion Crete Greece Telecommunications Department Electrical and Computer Engineering Faculty Aristotle University of Thessaloniki Thessaloniki Greece

The equipment used for radiation hazard evaluation usually is based in measuring the total electric field strength over a frequency bandwidth of interest. However, because of the fact that the defined Reference Levels (RL) according to the ICNIRP Guidelines or other specific legislation are frequency dependent, the compliance of a particular RF or microwave transmitter and its contribution to the total received electromagnetic energy at a given measurement location is not easily identifiable. On the other hand, narrowband measurements can be used to determine the incident electric field from every single transmitter. However, in such a case, a large number of measurements are required in order to estimate its contribution to the total electric field strength and consequently to check for compliance with the legislation limits, due to the fact that directional antennas should be used. In this work a method is presented for determining: the total electric field from a particular direction to a specific point of a measurement location (e.g. in the vicinity of a mobile base station), the angle of maximum incident electric field and the total exposure quotient from the sources laying at that particular location in a frequency band of interest.

关键词： Microwave devices

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On A Web-Graph-Based Micronetwork Architecture for SoCs

On A Web-Graph-Based Micronetwork Architecture for SoCs

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50th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS'07), vol.3

作者： Ling Wang Shouye Piao Yingtao Jiang Juyeon Jo Lihong Zhang Department of Computer Science Harbin Institute of Technology Harbin Heilongjiang China Department of Electrical and Computer Engineering University of Nevada Las Vegas NV USA School of Informatics University of Nevada Las Vegas NV USA Engineering and Applied Science Memorial University of Newfoundland Saint John's NEW Canada

From System-on-chip to Network-on-chip, the main dissimilarity is replacing the bus with the network. How connect, how formative network function is related to topology structure. In this paper we propose a topology structure for NoC, and compare it with mesh, torus, the fat tree, octagon, spidergon topology networks by five kinds of mainly properties: node degree, network diameter, connectivity, the average most short-circuit path and the average shortest wire length. Experiment results show that this topology has better performance on cost/performance layout.

关键词： Network-on-a-chip Network topology Integrated circuit interconnections System-on-a-chip Delay effects Wiring Power system interconnection Protocols computer architecture computer science

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MULTI-ROBOT SYSTEMS: FROM FINITE AUTOMATA TO MULTI-AGENT SYSTEMS

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IFAC Proceedings Volumes 2007年第18期40卷 121-126页

作者： Doru Panescu ştefan Dumbrava “Gh. Asachi” Technical University of Iaşi Faculty of Automatic Control and Computer Engineering Department of Automatic Control and Applied Informatics Bd. D. Mangeron 53 A Iaşi Romania dorup@ac.tuiasi.ro sdumbrav@ac.tuiasi.ro

An attempt to connect finite automata theory with multi-agent systems is presented. The purpose is to obtain an accurate way to plan and control the robot activities within a multi-robot system. The proposed model is an adapted Moore machine, which is to be used with a contract net protocol agent coordination procedure. The considered architecture was tested in an educational flexible manufacturing system with two industrial robots.

关键词： Robotics multi-robot systems multi-agent systems robot programming finite automata flexible manufacturing systems

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A hydraulic solution for actuating a human hand prosthesis

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WSEAS Transactions on Systems 2007年第1期6卷 40-46页

作者： Ungureanu, Loredana Stanciu, Antonius Menyhardt, Karoly Automation and Applied Informatics Department Politehnica University of Timisoara 2 Vasile Parvan Blvd. Timisoara 300223 Romania Computer Science and Engineering Department Politehnica University of Timisoara 2 Vasile Parvan Blvd. Timisoara 300223 Romania Mechanics and Vibrations Department Politehnica University of Timisoara 2 Vasile Parvan Blvd. Timisoara 300223 Romania

The first step in order to obtain good hand prosthesis consists in designing a model, based on the natural one and capable to reflect its architecture and functions. This is the reason why the researchers all over the world give a lot of attention to modeling the human hand. There are quite few solutions for human hand prosthesis, but the main setbacks are that each of them is too complex to be afforded by the majority of patients (especially the ones in underdeveloped countries) and none of them can perform as many tasks as the natural model. Having this in mind, we determined the kinematical and dynamical models of the human hand, to obtain a model as close as possible to the natural one. We realized, also, that if we limit our model's capabilities to the most important function of the hand, namely prehension (considering that the vast majority of potential patients have one good hand for performing delicate actions), then we can obtain an affordable human hand prosthesis with grabbing capabilities, which can help impaired people to manage through most of the daily activities. We propose a hydraulic based solution to actuate our hand prosthesis, which allows us to believe that our model is one of the simpler, yet reliable and non-expensive, among the specific research in the field.

关键词： Actuators

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FISH Image Analysis Using a Modified Radial Basis Function Network

FISH Image Analysis Using a Modified Radial Basis Function N...

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International Symposium on Signals, Circuits and Systems (ISSCS)

作者： Ioannis N. Kasampalidis Ioannis Pitas Georgia Karayannopoulou Ioannis Kostopoulos Paolo Aretini Generoso Bevilacqua Andrea Cavazzana Michele Menicagli Antonina Starita Kleoniki Lyroudia Department of Informatics School of Applied Sciences Aristotle University of Thessaloniki Thessaloniki Greece Department of Pathology Medical School Aristotle University of Thessaloniki Thessaloniki Greece Research Institute for Networks and Communications Engineering Radio and Optical Communications Laboratory University of Pisa and Pisa University Hospital Pisa Italy Institute of Molecular Genetics and Medicine MGM Pisa Italy Department of Computer Science Dental School University of Pisa Pisa Italy Department of Endodontology Dental School Aristotle University of Thessaloniki Thessaloniki Greece

Fluorescent in situ hybridization (FISH) is a valuable method for determining Her-2/neu status in breast carcinoma samples, an important prognostic indicator. Visual evaluation of FISH images is a difficult task which involves manual counting of dots in multiple images, a procedure which is both time consuming and prone to human error. A number of algorithms have recently been developed dealing with (semi)-automated analysis of FISH images. These algorithms are quite promising but further improvement is required in improving their accuracy. Here, we present a novel method for analyzing FISH images based on the statistical properties of Radial Basis Functions. Our method was evaluated on a data set of 100 breast carcinoma cases provided by the Aristotle University of Thessaloniki and the University of Pisa, with promising results.

关键词： Marine animals Image analysis Radial basis function networks Breast Image segmentation Fluorescence Pathology Biomedical imaging Performance analysis Morphological operations

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Remarks on singularities of a rational B-Spline representation of the sphere 5

Remarks on singularities of a rational B-Spline representati...

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5th International Conference APLIMAT 2006

作者： Schindler, Frank Department of Applied Computer Science and Engineering Faculty of Electrical Engineering and Informatics Slovak Technical University Ilkovičová 3 BratislavaSK-812 19 Slovakia

ISBN: (纸本)809673055X

In this article I deal with singularities of a rational B-Spline representation of the sphere. If just one rectangular parametric patch is used to form the whole sphere then two unwanted singularities arise. Those are the two points lying on the axis of revolution and therefore during the rotation of the half circle through an angle of 360 degrees around the diameter they form two degenerate isoparametric curves in one parametric direction. Of course, such points are problematic for most applications in graphics and CAD design because in their vicinity existing numerical methods for curve/surface or surface/surface intersections fail to converge. To circumvent this I suggest to use at least three such parametric patches via trimmed surfaces to fully describe the boundary of the sphere preserving the Euler formula and geometric G2 continuity of the resulting solid.

关键词： Spheres

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A method for personalized clustering in data intensive web applications

A method for personalized clustering in data intensive web a...

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Joint International Workshop on Adaptivity, Personalization and the Semantic Web, APS'06

作者： Rigou, Maria Sirmakessis, Spiros Tzimas, Giannis Computer Engineering and Informatics Department University of Patras Rio GR-26504 Department of Applied Informatics in Administration and Economy TEI of Messolonghi Nea Ktiria Messolonghi GR-30200 Research Academic Computer Technology Institute Patras University N. Kazantzaki Str. Rio GR-26500

ISBN: (纸本)1595934537

The paper introduces an algorithm for personalized clustering based on a range tree structure, used for identifying all web documents satisfying a set of predefined personal user preferences. The returned documents go through a clustering phase before reaching the end user, thus allowing more effective manipulation and supporting the decision making process. The proposed algorithm demonstrates increased applicability in semantic web settings, since they offer the infrastructure for the explicit declaration of web document attributes and their respective values, thus allowing for more automated retrieval. The proposed algorithm improves the k-means range algorithm, as it uses the already constructed range tree (i.e. during the personalized filtering phase) as the basic structure on which the clustering step is based, applying instead of the k-means, the k-windows algorithm. The total number of parameters used for modeling the web documents dictates the number of dimensions of the Euclidean space representation. The time complexity of the algorithm is O(log d-2n+v), where d is the number of dimensions, n is the total number of web documents and v is the size of the answer. Copyright 2006 ACM.

关键词： Cluster analysis

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A tool for extracting model clones from a conceptual schema

A tool for extracting model clones from a conceptual schema

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IASTED International Conference on Software engineering, as part of the 24th IASTED International Multi-Conference on applied informatics

作者： Faliagka, Evanthia Rigou, Maria Sirmakessis, Spiros Tzimas, Giannis Department of Computer Engineering and Informatics University of Patras Rio Campus 26504 Greece Research Academic Computer Technology Institute Patras University N. Kazantzaki str. Rio Campus 26500 Greece Department of Applied Informatics in Administration and Economy Technological Institution of Messolongi Nea Ktiria 30200 Greece

ISBN: (纸本)0889865744

In this paper the authors present an overview of techniques and tools that enable the effective evaluation and refactoring of a Web application's conceptual schema. Moreover, based on the introduction of the notion of model clones (in a previous work), as partial conceptual schemas that are repeated within a broader application model and the notion of model smells, as certain blocks in the Web applications model that imply the possibility of refactoring, this paper illustrates a methodology and a tool for detecting and evaluating the existence of potential model clones, in order to identify problems in an application's conceptual schema by means of efficiency, consistency, usability and overall quality. The methodology can be deployed either in the process of designing an application or in the process of reengineering it. Evaluation is performed according to a number of inspection steps. At first level the compositions used in the hypertext design are evaluated, followed by a second level evaluation concerning data manipulation and presentation to the user.

关键词： World Wide Web

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The Role of Context in m-Commerce and the Personalization Dimension

The Role of Context in m-Commerce and the Personalization Di...

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Web Intelligence and Intelligent Agent Technology Workshops (WI-IAT)

作者： Spiridoula Koukia Maria Rigou Spiros Sirmakessis Department of Computer Engineering & Informatics University of Patras Greece Department of Applied Informatics in Administration and Economics TEI of Mesolonghi Greece

The rapid development of mobile devices contributed to the introduction of m-commerce whose growth is expected to exceed that of e-commerce. The interface usability of mobile applications is a critical factor for the acceptance of m-commerce, as a good interface design allows users achieve high performance when using mobile applications. However, this it is especially difficult to achieve due to certain limitations of mobile devices; limited processing power, low-bandwidth communication, small display and overall device size, limited mobile Internet coverage, delays in standardization and poor quality of service. In this paper, we discuss the particular characteristics of the mobile setting, survey available design guidelines and stress the crucial role personalization can play for alleviating the aforementioned problems and allowing m-commerce reach its full potential

关键词： computer displays informatics Mobile computing Internet Large screen displays Content management Usability Intelligent agent User interfaces Power generation economics

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Robust stability checking of a class of linear interval fractional order system using lyapunov inequality

Robust stability checking of a class of linear interval frac...

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作者： Ahn, Hyosung Chen, YangQuan Podlubny, Igor Department of Electrical and Computer Engineering Utah State University Logan UT 84322-4160 United States Department of Applied Informatics and Process Control Technical University of Kosice B. Nemcovej 3 04200 Kosice Slovakia

ISBN: (纸本)9783902661128

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： Invariance

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