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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： S.E. Michos G.D. Magoulas N. Fakotakis Wire Communications Laboratory Division of Telecommunications and Technology Information Department of Electrical & Computer Engineering University of Patras Patras Greece Control Systems Laboratory Division of Systems and Control Department of Electrical & Computer Engineering University of Patras Patras Greece

A hybrid model for representing knowledge in a Greek natural language interface to MS-DOS is presented. This model employs semantic knowledge of the operating system domain to develop a hybrid architecture integrating symbolic and connectionist modules for recognizing the MS-DOS command labels of related or unrelated successive natural language user messages. This approach was deeply motivated by handling ellipsis, ambiguity and flexibility of sentence structure as well as possible. A comparative experimental evaluation of this approach to a symbolic one illustrating their pros and cons is also given. Finally, ways of extending this model are proposed with the view of making the natural language interface more user friendly and functional.

关键词： Knowledge representation Natural languages Artificial intelligence Telecommunication computing Wire Laboratories Communication system control control systems Telecommunication control computer architecture

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Efficient mixed-spectrum estimation with applications to target feature extraction

Efficient mixed-spectrum estimation with applications to tar...

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Asilomar Conference on Signals, Systems & computers

作者： Jian Li P. Stoica Department of Electrical & Computer Engineering University of Florida Gainesville FL USA Systems and Control Group Department of Technology University of Uppsala Uppsala Sweden

In this paper, we present a decoupled parameter estimation (DPE) algorithm for estimating sinusoidal parameters from both one-dimensional (1-D) and two-dimensional (2-D) data sequences corrupted by AR noise. In the first step of the DPE algorithm, we use a relaxation (RELAX) algorithm that requires simple fast Fourier transforms (FFTs) to obtain the estimates of the sinusoidal parameters. We describe how the RELAX algorithm may be used to extract radar target features from both 1-D and 2-D data sequences. In the second step of the DPE algorithm, a linear least squares approach is used to estimate the AR noise parameters. The DPE algorithm is both conceptually and computationally simple. The algorithm not only provides excellent estimation performance under the model assumptions, in which case the estimates obtained with the DPE algorithm are asymptotically statistically efficient, but is also robust to mismodeling errors.

关键词： Feature extraction Parameter estimation Application software Fast Fourier transforms Flexible printed circuits Data mining Radar Noise robustness Gaussian noise Additive white noise

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Angle and waveform estimation in the presence of colored noise via RELAX

Angle and waveform estimation in the presence of colored noi...

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Asilomar Conference on Signals, Systems & computers

作者： Jian Li P. Stoica Dumin Zheng Department of Electrical & Computer Engineering University of Florida Gainesville FL USA Systems and Control Group Department of Technology University of Uppsala Uppsala Sweden

This paper describes how the RELAX algorithm can be used for angle and waveform estimation of narrowband plane waves arriving at a uniform linear array in the presence of spatially colored noise. The RELAX algorithm is both conceptually and computationally simple; its implementation mainly requires a sequence of fast Fourier transforms. Both numerical and experimental examples are used to demonstrate the performance of the RELAX algorithm for angle and waveform estimation.

关键词： Colored noise Sensor arrays Vectors Fast Fourier transforms Signal resolution Array signal processing Additive white noise Narrowband Spatial resolution Signal processing

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Improved LMS estimation via structural detection

Improved LMS estimation via structural detection

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IEEE International Symposium on Information Theory

作者： J. Homer I. Mareels R. Bitmead B. Wahlberg F. Gustafsson Electrical & Computer Engineering Department University of Queensland Brisbane QLD Australia Systems Engineering Department RSISE-Australian National University Canberra ACT Australia S3-Automatic Control Royal Institute of Technology Stockholm Sweden Automatic Control Linköping University Linkoping Sweden

In various adaptive estimation applications, the unknown channel is characterized by an impulse response which consists of extended regions of negligible response or 'inactivity'. We consider the LMS estimation of a channel that may be well approximated by an FIR (filter) model with only a few nonzero tap coefficients within a given delay horizon or tap length n. When the number of nonzero tap coefficients m is small compared to the delay horizon n, the performance of the LMS estimator is greatly enhanced when this specific structure is exploited. We propose a consistent algorithm that performs identification of nonzero taps only.

关键词： Least squares approximation Australia Cost function Finite impulse response filter Automatic control Delay estimation Adaptive estimation Circuits Land mobile radio Sampling methods

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Using genetic algorithms with grammar encoding to generate neural networks

Using genetic algorithms with grammar encoding to generate n...

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International Conference on Neural Networks

作者： E. Vonk L.C. Jain R. Johnson Control Systems and Computer Engineering Group (BSC) Department of Electrical Engineering University of Twente Netherlands Knowledge-based Engineering Systems Group School of Electronic Engineering University of South Australia Adelaide Australia Weapons Systems Division Defence Science and Technology Organisation Adelaide Australia

Kitano's approach to neural network design is extended in the sense that not just the neural network structure, but also the values of the weights are coded in the chromosome. Experimental results are presented de... 详细信息

关键词： Genetic algorithms Encoding Neural networks Biological cells Knowledge engineering Systems engineering and theory control systems Weapons Australia Testing

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Blind linear recursive equalizer with decorrelation algorithm

Blind linear recursive equalizer with decorrelation algorith...

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

作者： T.S. Castelein Y. Bar-Ness R. Prasad Northern Telecom Inc. Netherlands New Jersey Institute of Technology Department of Electrical & Computer Engineering University Heights Newark NJ USA Telecommunications and Traffic Control Systems Group Delft University of Technnology Delft Netherlands

High-speed communications suffer from intersymbol interference (ISI) introduced by the channel. In order to combat ISI one commonly uses equalizers that need a training sequence to adjust the equalizer tap weights. When sending a training sequence is not appropriate, blind equalization has to be used. A new blind linear equalizer is proposed. The equalizer has a recursive structure. To avoid stability problems, a soft limiter is used in the feedback loop. The weights are controlled by means of the decorrelation algorithm. For channels without precursors, the equalizer converges to the desired weights in around 500 iterations, depending on the amount of distortion. The novel blind equalization technique is globally convergent for minimum and non-minimum phase channels.

关键词： Decorrelation Blind equalizers Decision feedback equalizers Finite impulse response filter Communication system control Stability Weight control Convergence Communication system traffic control Telecommunication computing

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OPTIMUM FREQUENCY REUSE IN MOBILE TELEPHONY SYSTEMS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 185-190页

作者： KAZANTZAKIS, MG DEMESTICHAS, PP ANAGNOSTOU, ME National Technical University of Athens Computer Science Division Department of Electrical and Computer Engineering Heroon Polytechneiou 9 Zografou Athens 15773 Greece Michael G. Kazantzakii was born in Athens Greece in 1962. He received both the Diploma and Ph.D. Degree from the Electrical Engineering Department of the National Technical University of Athens in 1986 and 1992 respectively. During the period 1992–1993 he was a member of the Staff of the Hellenic Navy Research Centre working in the area of underwater acoustics. Since 1994 he has been a researcher at the National Technical University of Athens Department of Electrical Engineering and Computer Science Telecommunications Laboratory. His interests include data mobile and integrated services networks. Panagiotis P. Demestichas was born in Athens Greece in 1967. He received the Diploma in electrical engineering from the National Technical University of Athens (NTUA) Athens in 1993. At present he is a research assistant at NTUA working towards his Ph.D. dissertation. He participated in the BRITE/EURAM-EURATN and in the RACE-TOMQAT and MONET projects. His research interests are in the areas of broadband and mobile networks queueing theory algorithms and complexity theory. He is a Member of the Technical Chamber of Greece. Miltiades E. Anagnostou was born in Athens in 1958. He received the Electrical Engineers Diploma from the National Technical University of Athens (NTUA) in 1981. During the period 1981–1987 he was a teaching assistant at NTUA. In 1987 he received his Ph.D. in the area of computer networks. In 1987–1989 he served the Greek army in the Air Force Research and Development Center. In 1989–1991 he was a Lecturer and since 1991 he has been an Assistant Professor in the Computer Science Division Department of Electrical and Computer Engineering of the NTUA. He teaches courses on modern telecommunications formal specification of protocols stochastic processes and queueing theory. Since 1981 Dr. Anagnostou has been involved

The reason why cellular mobile telephony systems exist is that they allow frequency reuse. Dynamic allocation algorithms improve the network efficiency and the service quality. Dynamic allocation is closely related to the following instantaneous allocation problem: given a number of channels (frequencies), a cell structure and the number of calls to be accommodated in each cell, find the optimum allocation of channels to cells subject to restrictions concerning the distance of cells, where the same frequency can be reused. In this paper we formulate and solve this problem by showing that it can be reduced to a 0-1 programming problem. Finally we present results, and draw subsequent conclusions.

关键词： MOBILE TELEPHONY FREQUENCY ALLOCATION UMTS

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Automatic generation of a neural network architecture using evolutionary computation

Automatic generation of a neural network architecture using ...

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Electronic technology Directions to the Year 2000

作者： E. Vonk L.C. Jain L.P.J. Veelenturf R. Johnson Control Systems and Computer Engineering Group BSC Laboratory for Network Theory Department of Electrical Engineering University of Twente Enschede Netherlands Knowledge-based Engineering System Group School of Electronic Engineering University of South Australia Adelaide Australia Weapons Systems Division Defence Science and Technology Organisation Salisbury SA Australia

This paper reports the application of evolutionary computation in the automatic generation of a neural network architecture. It is a usual practice to use trial and error to find a suitable neural network architecture. This is not only time consuming but may not generate an optimal solution for a given problem. The use of evolutionary computation is a step towards automation in architecture generation. In this paper a brief introduction to the field is given as well as an implementation of automatic neural network generation using genetic programming.< >

关键词： Neural networks computer architecture Evolutionary computation Genetic programming Network topology Genetic algorithms Biological cells Systems engineering and theory Knowledge engineering Australia

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A study on the design and characteristics of the high frequency resonant inverter for ultrasonic motor drive using fuzzy controller

A study on the design and characteristics of the high freque...

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International Conference on Industrial Electronics, control and Instrumentation

作者： In-Su Cha Hae-Am Park Gwon-Jong Yu Young-Dong Kim Hyung Lae Baek Department of Electric & Electronic Engineering Dong Shin University Choongnam South Korea Department of Computer & Information Processing Kwangju Institute of Science and Technology Kwangju South Korea Department of Photovoltaic System Korea Institute of Energy and Research Daejeon South Korea Department of Control & Measurement Engineering Chosun University Sesekdong South Korea Department of Electrical Engineering Chosun University Sesekdong South Korea

ISBN: (纸本)0780330269

In the present paper, a fuzzy logic based ultrasonic motor (USM) is used in order to properly control the speed and phase difference for the elasticity and viscosity of a robot joint. The traveling wave USM is driven by two-phase sine wave signals, and the phase difference of the signals is usually selected to +90/spl deg/ and -90/spl deg/ meaning high speed and maximum torque of the USM. In this paper, we describe USM rotational speed characteristics at no load. The first phase difference is adjusted in the range from +90/spl deg/ to -90/spl deg/ by fuzzy controller as is the reached target speed.

关键词： Resonant frequency Resonant inverters

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FAULT-TOLERANT ASSOCIATE MEMORIES

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SYSTEMS AND computerS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION

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