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Radio wave propagation measurements in tunnel entrance environment for intelligent transportation systems applications

Radio wave propagation measurements in tunnel entrance envir...

引用

International Conference on Intelligent Transportation

作者： A.V.B. da Silva M. Nakagawa Dept. of Inf. & Comput. Sci. Keio Univ. Yokohama Japan Department of Information and Computer Science Keio University Yokohama Kanagawa Japan

Underground environments are of great interest to intelligent transportation system (ITS) applications, since they occur frequently in both urban and rural situations, and have peculiar propagation characteristics. This investigation includes two of the major fields in ITS applications: road-to-vehicle, and vehicle-to-vehicle communications. Besides that, the propagation measurements presented also focus on the transition effects when moving between the regions outside and inside a tunnel, which represents its entrance environment. The experimental results of path loss and delay spread profiles are presented and analyzed.

关键词： Intelligent transportation systems Pricing Intelligent Transportation Systems Society Road vehicles Urban areas Area measurement Pollution measurement Propagation losses Propagation delay computer science

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Location management using fuzzy logic control for wireless networks

Location management using fuzzy logic control for wireless n...

引用

International Conferences on inf.-tech and inf.-net (ICII)

作者： Li-Der Chou Liu. Gen-Chung Department of Computer Science and Information Engineering National Central University Taoyuan Taiwan Department of Computer Science and Information Engineering National Central University Chungli Taoyuan Taiwan China National Central University Chung-Li TW Dept. of Comput. Sci. & Inf. Eng. Nat. Central Univ. Taoyuan Taiwan

ISBN: (纸本)0780370104

In the micro-/pico-cellular wireless networks, the frequency of handoffs, and the amount of the traffic for location updating and terminal paging will increase. For the geographical environment, the uncertainty of user behavior and current positions, traditional location updating schemes are no longer applicable to micro-/pico-cellular wireless networks. In the paper a location-updating scheme using fuzzy logic control is proposed to adaptively adjust the size of the location area for each user. Simulation results show that, for the proposed scheme, the total location management cost is reduced by 40.24% on average. Moreover, the proposed scheme can operate normally under the geographical environment with blockage, and reduce the terminal paging cost efficiently.

关键词： Fuzzy logic Wireless networks Paging strategies Databases computer network management Uncertainty Size control Costs computer science Frequency

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The specification and testing of quantified progress properties in distributed systems

The specification and testing of quantified progress propert...

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International Conference on Software engineering (ICSE)

作者： P. Knshnamurthy P.A.G. Sivilotti Dept. of Comput. & Inf. Sci. Ohio State Univ. Columbus OH USA Department of Computer and Information Science The Ohio State University Columbus OH USA

ISBN: (纸本)0769510507

There are two basic parts to the behavioral specification of distributed systems: safety and progress. In earlier work, we developed a tool to monitor progress properties of CORBA components specified using the temporal operator transient. In this paper, we address the specification and testing of transient properties that are quantified (over both bounded and unbounded domains). We categorize typical quantifications that arise in practical systems and discuss possible implementation strategies. We define functional transients, a subclass of quantified transient properties that can be monitored in constant space and time. We outline the design and implementation of a tool for testing these properties in CORBA components.

关键词： System testing Java Distributed computing Transient analysis inf.rmation science Safety computerized monitoring Concurrent computing Software testing Prototypes

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A study on the use of Gabor features for Chinese OCR

A study on the use of Gabor features for Chinese OCR

引用

International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： Qiang Hao Zhi-Dan Feng Yong Ge Dept. of Comput. Sci. & Inf. Syst. Hong Kong Univ. China Department of Computer Science and Information Systems The University of Hong Kong Hong Kong China

ISBN: (纸本)9628576623

The authors revisit the topic of Gabor feature extraction for Chinese OCR. We adopt a very simple discriminant function to construct a maximum discriminant function based character recognizer. We experiment with a simple way of forming a feature vector for each character image by extracting Gabor features using one wavelength at locations uniformly sampled with one spatial resolution. Extensive experiments on large vocabulary Chinese OCR for both machine-printed and handwritten characters are performed by using a large amount of training and testing data to demonstrate the effectiveness of the Gabor features for Chinese OCR. Using Gabor features as raw features, we have constructed several state-of-the-art Chinese OCR engines.

关键词： Optical character recognition software Character recognition Feature extraction Pattern recognition Pattern analysis Automatic speech recognition Spatial resolution Prototypes Image recognition Pattern classification

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Example-based query generation for spontaneous speech

Example-based query generation for spontaneous speech

引用

IEEE Workshop on Automatic Speech Recognition and Understanding

作者： H. Murao N. Kawaguchi S. Matsubara Y. Inagaki Center for Integrated Acoustic Information Research University of Nagoya Nagoya Japan Hypermedia Research Center Sanyo Electric Company Limited Hirakata Osaka Japan Computation Center University of Nagoya Nagoya Japan Nagoya Daigaku Nagoya Aichi JP Center for Integrated Acoust. Inf. Res. Nagoya Univ. Japan Department of Computational Science and Engineering University of Nagoya Nagoya Japan

This paper proposes a new query generation method that is based on examples of human-to-human dialogue. Along with modeling the inf.rmation flow in dialogue, a system for inf.rmation retrieval in-car has been designed. The system refers to the dialogue corpus to find an example that is similar to input speech, and makes a query from the example. We also give the experimental results to show the effectiveness of this method.

关键词： Speech inf.rmation retrieval Databases Humans Acoustical engineering Natural languages Robustness

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Experiments on FPRM expressions for partially symmetric logic functions

Experiments on FPRM expressions for partially symmetric logi...

引用

International Symposium on Multiple-Valued Logic

作者： S.N. Yanushkevich J.T. Butler G.W. Dueck V.P. Shmerko Faculty of Computer Science & Inf. Systems Technical University Szczecin Poland Department Electrical & Computer Eng Monterrey USA Faculty of Computer Sci University of New Brunswick Fredericton NB Canada Faculty of Computer Science & Inf. Syst Technical University of Szczecin Poland

This paper focuses on the fired polarity Reed-Muller (FPRM) expression of multiple-valued logic (MVL) symmetric functions. In the FPRM expression, each variable occurs in exactly one complemented form. We show propert... 详细信息

关键词： Logic functions Niobium Cost function Character generation

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Neuroinf.rmatics research in vision

Neuroinformatics research in vision

引用

IEEE EMBS International Conference on inf.rmation Technology Applications in Biomedicine (ITAB)

作者： S. Usui Biol. & Physiol. Engineering Laboratory Department of Inf. & Computer Sci Toyohashi University of Technology Toyohashi Japan

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Higher-order (nonlinear) diffraction tomography

Higher-order (nonlinear) diffraction tomography

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： G.A. Tsihrintzis A.J. Devaney Dept. of Inf. Piraeus Univ. Greece Department of Electrical and Computer Engineering Northeastern University Boston MA USA

Nonlinear tomographic reconstruction algorithms are developed for inversion of data measured in scattering experiments in which the scattered wavefields are modeled by an arbitrarily large number of terms in the Born series. The algorithms attain the form of a Volterra series of nonlinear operators, with the usual filtered backpropagation algorithm of diffraction tomography as the leading linear term.

关键词： Diffraction Tomography Optical scattering Electromagnetic scattering X-ray scattering Inverse problems Acoustic scattering Optical refraction Optical microscopy Image reconstruction

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Dimension reduction of texture features for image retrieval using hybrid associative neural networks

Dimension reduction of texture features for image retrieval ...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： J.A. Catalan J.S. Jin Dept. of Inf. Eng. Univ. of New South Wales NSW Australia Department of Information Engineering School of Computer Science and Engineering University of New South Wales Australia

Current multidimensional indexing structures employed in content based image retrieval systems perform poorly when applied to feature data of high dimensionality. To alleviate this problem, one approach is to reduce the number of dimensions of the image data. The authors present a technique of dimensionality reduction using a neural network that combines heteroassociative and autoassociative functions. We show that besides allowing significant reduction in the number of dimensions, combining these two functions can lead to an improvement in retrieval performance.

关键词： Image retrieval Neural networks inf.rmation retrieval Principal component analysis Indexing Performance analysis Multi-layer neural network Data engineering Shape computer science

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Measurement of ATM frame latency

Measurement of ATM frame latency

引用

Conference on Local computer Networks (LCN)

作者： A. Durresi G. Babic R. Jain Computer & Inf. Science Department Ohio State Uinversity Columbus OH USA Nayna Networks Inc. Milpitas CA USA

Frame latency, as one of the main QoS parameters, quantifies also the level of quality of network devices. We proposed a new metric for ATM frame latency called MIMO (message-in message-out) latency that improves upon other latency metrics commonly used for continuous frame technologies. Analysis of examples and measurement results showed that MIMO is less workload dependent and a better indicator of switch performance. MIMO can be used to measure the frame latency of a single switch or of a network of switches. We showed that the formulation of MIMO aggregation is very useful in understanding the contribution of each network element and their interconnections to the total frame latency.

关键词： Delay Switches MIMO Asynchronous transfer mode Testing Monitoring Performance analysis Performance loss Quality of service Measurement

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