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International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, iWAT

作者： A.A. Lestari A.B. Suksmono E. Bharata A.G. Yarovoy L.P. Ligthart International Research Centre for Telecommunications and Ra&r (IRCTR) Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Delft Netherlands Department of Electrical Engineering Bandung Institute of Technology Microwave and Radio Telecommunication Laboratory Bandung Indonesia

The paper describes an ultra-wideband (UWB) antenna developed for impulse ground penetrating radar (GPR) applications. The antenna is a modified bow-tie antenna designed for short-range GPR applications such as road inspection and non-destructive testing of concrete. For these applications, the transmitted pulses should have minimal ringing to avoid masking of targets. This can be achieved by the application of resistive loading at the expense of radiation efficiency. We have attempted to improve a conventional bow-tie antenna usually used in GPR by reducing the antenna size and minimizing ringing, while at the same time improving the antenna radiation efficiency.

关键词： Ultra wideband antennas Loaded antennas Ground penetrating radar Microwave technology Directive antennas Antenna feeds Wire Dielectric substrates Laboratories Radar antennas

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Properties of a room temperature terahertz detection array

Properties of a room temperature terahertz detection array

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International Conference on Infrared and Millimeter Waves

作者： T.O. Klaassen A.J.L. Adam I. Kasalynas J.N. Hovenier G. Pandraud V.P. Iordanov P.M. Sarro Kavli Institute of NanoScience Delft Delft University of Technnology Delft Netherlands Electronic Instrumentation Laboratory Department of Microelectronics Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Delft Netherlands Health Care Devices and Instrumentation Philips Research Eindhoven Netherlands Delft Institute of Microelectronics and Submicron Technology DIMES Electronic Components Technology and Materials Laboratory Delft University of Technnology Delft Netherlands

An 8/spl times/8 pixel array has been designed and fabricated for broadband THz detection. Each pixel consists of a 500/spl times/500 /spl mu/m thin film absorber on a SiN membrane with thermopile temperature readout. The expected performances - NEP = 4.10/sup -9/ W/Hz/sup 1/2/ and 10 ms response time - were compared with test results.

关键词： Materials science and technology Detectors Temperature sensors Absorption Instruments Silicon compounds Biomembranes Pyroelectricity CMOS technology Semiconductor films

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Systematic, multisite short-range-order corrections to the electronic structure of disordered alloys from first principles: The KKR nonlocal CPA from the dynamical cluster approximation

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Physical Review B 2005年第11期72卷 113105-113105页

作者： D. A. Biava Subhradip Ghosh D. D. Johnson W. A. Shelton A. V. Smirnov Department of Physics University of Illinois Urbana-Champaign 1110 W. Green Street Urbana Illinois 61801 USA Frederick Seitz Materials Research Laboratory University of Illinois Urbana-Champaign 104 S. Goodwin Avenue Urbana Illinois 61801 USA Materials Science & Engineering University of Illinois Urbana-Champaign 1304 W. Green Street Urbana Illinois 61801 USA Department of Physics Indian Institute of Technology Guwahati Assam-781039 India Computer Science and Mathematics Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

Although the Korringa-Kohn-Rostoker coherent-potential approximation (KKR-CPA) is used widely to configurationally average and get electronic structures and energies of disordered alloys, a single-site CPA misses local environment effects, including short-range order (SRO). A proposed nonlocal CPA (NLCPA) recovers translational invariance of the effective medium via k-space coarse graining from the dynamical cluster approximation (DCA), where corrections are systematic as cluster size increases. We implement a first-principles KKR-NLCPA/DCA and show the effects of environment, including SRO, on the electronic structures of fcc CuAu and bcc NiAl.

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TSS: A hybrid web searches

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Advanced Workshop on Content Computing, AWCC 2004

作者： Han, Li-Xin Chen, Gui-Hai Xie, Li Department of Mathematics Nanjing University Nanjing210093 China Department of Computer Science and Engineering Hohai University Nanjing210024 China State Key Laboratory of Novel Software Technology Nanjing University Nanjing210093 China

ISBN: (纸本)3540238980

Because of emergence of Semantic Web, It make possible for machines to understand the meaning of resources on the Web. The widespread availability of machine understandable information will impact on Information retrieval on the web. In this paper, we propose a hybrid web searches architecture, TSS, which combines the traditional search with semantic search to improve precision and recall. The components in TSS are described to support the hybrid web searches. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Information retrieval

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Heuristic-based model refinement for FLAVERS 04

Heuristic-based model refinement for FLAVERS

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International Conference on software engineering (ICSE)

作者： J. Tan G.S. Avrunin L.A. Clarke Laboratory of Advanced Software Engineering Research Department of Computer Science University of Massachusetts Amherst MA USA

ISBN: (纸本)9780769521633

FLAVERS is a finite-state verification approach that allows an analyst to incrementally add constraints to improve the precision of the model of the system being analyzed. Except for trivial systems, however, it is impractical to compute which constraints should be selected to produce precise results for the least cost. Thus, constraint selection has been a manual task, guided by the intuition of the analyst. In this paper, we investigate several heuristics for selecting task automaton constraints, a kind of constraint that tends to reduce infeasible task interactions. We describe an experiment showing that one of these heuristics is extremely effective at improving the precision of the analysis results without significantly degrading performance.

关键词： Costs Information analysis Automata software engineering Performance analysis Laboratories computer science Degradation Data analysis

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A Method of Acquiring Ontology Information from Web Documents

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3314卷 1041-1046页

作者： Han, Lixin Chen, Guihai Xie, Li Department of Mathematics Nanjing University China State Key Laboratory of Novel Software Technology Nanjing University China Department of Computer Science and Engineering Hohai University China

Ontology plays an important role on the Semantic Web. In this paper, we propose a method, AOIWD, of acquiring ontology information from Web documents. The AOIWD method employs data mining techniques combined with inference engine techniques to develop ontology. One key feature of AOIWD is that it employs association rules and inference mechanism to create association instances of ontology classes. Another key feature of AOIWD is that it employs clustering to create ontology class hierarchy. The method can discover more meaningful relationships and has less human intervention. © Springer-Verlag 2004.

关键词： Ontology

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Reducing overfitting in genetic programming models for software quality classification

Reducing overfitting in genetic programming models for softw...

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IEEE International Symposim on High Assurance Systems engineering

作者： Yi Liu T. Khoshgoftaar Mathematics and Computer Science Department Georgia College State University Milledgeville GA USA Empirical Software Engineering Laboratory Department of Computer Science and Engineering Florida Atlantic University Boca Raton FL USA

A high-assurance system is largely dependent on the quality of its underlying software. software quality models can provide timely estimations of software quality, allowing the detection and correction of faults prior to operations. A software metrics-based quality prediction model may depict overfitting, which occurs when a prediction model has good accuracy on the training data but relatively poor accuracy on the test data. We present an approach to address the overfitting problem in the context of software quality classification models based on genetic programming (GP). The problem has not been addressed in depth for GP-based models. The presence of overfitting in a software quality classification model affects its practical usefulness, because management is interested in good performance of the model when applied to unseen software modules, i.e., generalization performance. In the process of building GP-based software quality classification models for a high-assurance telecommunications system, we observed that the GP models were prone to overfitting. We utilize a random sampling technique to reduce overfitting in our GP models. The approach has been found by many researchers as an effective method for reducing the time of a GP run. However, in our study we utilize random to reduce overfitting with the aim of improving the generalization capability of our GP models.

关键词： Genetic programming software quality Predictive models Fault detection Training data software testing Context modeling Quality management software performance Sampling methods

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Text area identification in web images

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3rd Hellenic Conference on Artificial Intelligence, SETN 2004

作者： Perantonis, Stavros J. Gatos, Basilios Maragos, Vassilios Karkaletsis, Vangelis Petasis, George Computational Intelligence Laboratory Institute of Informatics and Telecommunications National Research Center 'Demokritos' Athens153 10 Greece Software and Knowledge Engineering Institute of Informatics and Telecommunications National Research Center 'Demokritos' Athens153 10 Greece Department of Computer Science Technological Educational Institution of Athens Egaleo122 10 Greece

ISBN: (纸本)3540219374

With the explosive growth of the World Wide Web, millions of documents are published and accessed on-line. Statistics show that a significant part of Web text information is encoded in Web images. Since Web images have special characteristics that sometimes distinguish them from other types of images, commercial OCR products often fail to recognize Web images due to their special characteristics. This paper proposes a novel Web image processing algorithm that aims to locate text areas and prepare them for OCR procedure with better results. Our methodology for text area identification has been fully integrated with an OCR engine and with an Information Extraction system. We present quantitative results for the performance of the OCR engine as well as qualitative results concerning its effects to the Information Extraction system. Experimental results obtained from a large corpus of Web images, demonstrate the efficiency of our methodology. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Image processing

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Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

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Testing of Component-Based Systems and software Quality, 1st International Workshop on software Quality, SOQUA 2004 and Workshop Testing Component-Based Systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

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Identifying entanglement using quantum "ghost" interference and imaging

Identifying entanglement using quantum "ghost" interference ...

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International Quantum Electronics Conference, IQEC

作者： D'Angelo, Milena Kim, Yoon-Ho Kulik, Sergei P. Shih, Yanhua Department of Physics University of Maryland Baltimore County Baltimore MD 21250 United States Center for Engineering Science Advanced Research Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge TN 37831 United States Department of Physics Moscow State University Moscow Russia

We report a quantum interference and imaging experiment which shows quantitatively that entangled two-photon violate the EPR inequality. This measurement provides a direct way to distinguish quantum entanglement from ... 详细信息

关键词： Quantum electronics

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