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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Helmi Zulhaidi Mohd Shafri RSA Raja Abdullah Mardeni Roslee Ratnasamy Muniandy Department of Civil Engineering Universiti Putra Malaysia Serdang Malaysia Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Malaysia

This paper presents an optimization of GPR mixture model based on the measurements and simulation results at frequency range of 1.7-2.6 GHz. The purpose is to get a most accurate relationship between attenuation and density for various road pavements densities. The proposed method is simple, fast, nondestructive and accurate way to determine the density of road pavement. Density is a one of the important parameter in order to determine the compressive strength of road pavement. In laboratory, a few of received signal strength and measured attenuation for nine road pavement slab samples were taken at four different frequencies. The GPR mixture model has been used to produce the predicted attenuation due to the pavement density. The calculation and selection of mixture model has been discussed thoroughly and only the best performance of GPR mixture model was selected for optimization.

关键词： Ground penetrating radar Data analysis Density measurement Electromagnetic measurements Space technology Power measurement Frequency measurement Attenuation measurement Road safety Permittivity

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Building classification rules for case-based classifier using fuzzy sets and formal concept analysis 08

Building classification rules for case-based classifier usin...

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5th International Conference on Soft Computing As Transdisciplinary Science and Technology, CSTST '08

作者： Tadrat, Jirapond Boonjing, Veera Pattaraintakorn, Puntip Software Systems Engineering Laboratory Department of Mathematics and Computer Science King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Department of Mathematics and Computer Science Faculty of Science King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand

ISBN: (纸本)9781605580463

The focus of this paper is a construction of better knowledge base in case-based classifier system. Our knowledge base structure is based on concept lattice where rules are built from its subconcept-superconcept relation. Since the lattice can only be constructed from inputs with binary attributes, descriptive and numeric attributes must be transformed to binary attributes. In this paper, we propose the transformation of numeric attributes to descriptive attributes using fuzzy set theory. We experiment on benchmark data sets, Car and Iris, to determine the performance in term of number of rules used and classification precision. The results show that trend of accuracy is proportional to the size of learning inputs. The number of rules used is relatively small compared with size of training data. Our case-based classifier produces very promising results in practice and can classify the new problem more accurate than traditional classifiers. Copyright 2008 ACM.

关键词： Formal concept analysis

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The HomeCare and Circadian rhythm

The HomeCare and Circadian rhythm

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IEEE EMBS International Conference on Information Technology Applications in Biomedicine (ITAB)

作者： M. Cerny M. Penhaker Biomedical Engineering Laboratory Faculty of Electrical Engineering and Computer Science Department of Measurement and Control Technical University of Ostrava Ostrava Czech Republic Department of Measurement and Control Vice director Biomedical Engineering Laboratory Director Faculty of Electrical Engineering and Computer Science Technical University of Ostrava Ostrava Czech Republic

The HomeCare is a special monitoring system of the basic life functions. It has been primarily designed to take care for elderly people. But many of the designed devices could be used in the other branches of biotelemetry. Our HomeCare system is designed with respect to user comfort and it uses as cheap technical solutions as possible. In cooperation with the Ostrava University a Homecare Testing Flat has been realized. There are tested our Homecare solutions in vivo. This article is focused on the designed HomeCare system, on measured parameters and on used wireless technologies. The Circadian rhythm measurement and its usage in the HomeCare system are discussed in the article too.

关键词： Circadian rhythm Biomedical measurements Electrocardiography Biomedical engineering Laboratories Biomedical monitoring computer science Blood Testing Medical control systems

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A new dynamic code assignment algorithm for joint CDMA and SDMA system

A new dynamic code assignment algorithm for joint CDMA and S...

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Asia-Pacific Conference on Communications

作者： Nidhal Odeh Sabira Khatun Alyani Ismail Borhanuddin Mohd Ali Wireless and Network Laboratory Department of Computer & Communications Systems Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Darul Ehsan Malaysia

This article describes an optimal dynamic code assignment algorithm, which can be used to maximize the total number of users in combined C-SDMA system with minimum required quality of service (QoS) and limited number of codes. Here, a single cell adopts combined C-SDMA system as air-interface, and accommodate any number of users distributed randomly within it. The probability of blocking is calculated to evaluate the system performance for different number of users and available codes. Results show that the proposed algorithm improves the system performance significantly compared to the existing algorithms. Finally, this algorithm enhances system capacity with limited resources.

关键词： Multiaccess communication Heuristic algorithms Directive antennas Multiple access interference system performance Transmitting antennas Mobile antennas Base stations Quality of service Gain

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Feasibility of a standalone AC grid supplied by the VSC-stations

Feasibility of a standalone AC grid supplied by the VSC-stat...

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IEEE General Meeting Power& Energy Society

作者： Si-Ye Ruan Guo-Jie Li Boon-Teck Ooi Yuan-Zhang Sun State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China Department of Electrical and Computer Engineering McGill University Montreal QUE Canada

It is desirable that remote isolated communities can become self-sufficient in electric power from renewable energy sources. Renewable energy sources (wind, run of river hydro, photovoltaic) require voltage-source-converter (VSC) Stations as frequency changers to connect them to an ac grid. This paper examines the feasibility of a standalone ac grid supplied by the VSC-stations. The VSC-stations set the grid frequency and maintain real power balance of generation and load in the entire ac grid from information based on frequency deviation. digital simulation results show the availability of a standalone ac grid supplied by the VSC-stations with proposed real power regulation.

关键词： Converters Power conversion Regulators Frequency control Frequency measurement Generators Load modeling

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Comparison of Direct and Incremental Genetic Algorithm for Optimization of Ordinal Fuzzy Controllers

Comparison of Direct and Incremental Genetic Algorithm for O...

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ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing (SNPD)

作者： Khairulmizam Samsudin Faisul Arif Ahmad Syamsiah Mashohor Norfadzilah Mohd Latif Laboratory of Computer Systems Department of Computer & Communication Systems Faculty of Engineering Universiti Putra Malaysia Selangor Malaysia

ISBN: (纸本)9780769532636

Conventional fuzzy logic controller is applicable when there are only two fuzzy inputs with usually one output. Complexity increases when there are more than one inputs and outputs making the system unrealizable. The ordinal structure model of fuzzy reasoning has an advantage of an easier approach of setting the rules with multiple inputs and outputs. This is achieved by giving an associated weightto each rule in the defuzzification process. An ordinal fuzzy logic controller has been designed with application for obstacle avoidance of Khepera mobile robot. Implementation show that ordinal structure fuzzy is easier to design compared to conventional fuzzy controller. However finding the best weight for each rule is a large and complex search problem. A specially tailored Genetic Algorithm (GA) approach has been proposed to find the best weight value foreach rule in the ordinal structure fuzzy controller. In this work, the comparison of direct and incremental GA for optimization of the controller is presented. Simulation results demonstrated significantly improved obstacle avoidance performance of incremental GA optimization of ordinal fuzzy controllers compared to direct GA optimized controller.

关键词： Gallium Fuzzy logic Optimization Artificial intelligence Evolution (biology) Silicon Software engineering

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Comparison of wavelength propagation for Free Space Optical Communications

Comparison of wavelength propagation for Free Space Optical ...

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International Conference on Electronic Design (ICED)

作者： B.S. Naimullah M. Othman A. K. Rahman S.I. Sulaiman S. Ishak S. Hitam S.A. Aljunid Faculty of Electrical Engineering Universiti Teknologi MARA Sarawak Samarahan Sarawak Malaysia Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia School of Computer & Communication Engineering Universiti Malaysia Pedis Kuala Perlis Perlis Malaysia Photonics Laboratory Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

This paper presents the effect of atmospheric attenuation during severe hazy days for free space optical communications. The usage of free space optical communications is still rare in Malaysia due to environment factor. The FSO technology is also known as unguided beam or dasiaoptical wirelesspsila or infrared broadband. This study offers quick preliminary investigation on possible FSO performance based on wavelength selection before final commissioning and installation at site. Thus, FSO installers could make quick judgment before giving recommendation of a suitable wavelength to the customers. Preliminary evaluation of system performance of system performance is done by using local weather data obtained from metrological department. Current study among designers and FSO users show that 1550 nm light produce less atmospheric attenuation in the transmission under all weather conditions. In this study, a suitable wavelength for FSO system is found for a particular site in low visibility. The best wavelength selection would result in optimized quality of FSO transmission in hazy conditions.

关键词： Optical propagation Optical fiber communication Optical attenuators system performance Optical scattering Hardware Space technology Optical sensors Optical computing Optical beams

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Performance and robustness analysis of a fuzzy-immune flow controller in ATM networks with time-varying multiple time-delays

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控制理论与应用（英文版） 2008年第3期6卷 253-258页

作者： Tao REN Zhenhua GAO Weiming KONG Yuanwei JING Muyi YANG Georgi M. DIMIROVSKI Key Laboratory of Process Industry Automation of MOE and Liaoning Province Northeastern University Shenyang Liaoning 110004 China School of Information Science and Engineering Northeastern University Shenyang Liaoning 110004 China Faculty of Engineering Department of Computer Engineering Dogus University Istanbul TR-347222 Republic of Turkey

For the Asynchronous Transfer Mode （ATM） networks with time-varying multiple time-delays, a more realistic model for the available bit rate （ABR） traffic class with explicit rate feedback is introduced. A fuzzy-immune controller is designed, which can adjust the rates of ABR on-line, overcome the bad effect caused by the saturation nonlinearity and satisfy the weighted fairness. Also, the sufficient condition that guarantees the stability of the closed-loop system with a fuzzy-immune controller is presented in theory for the first time. The algorithm exhibits good performance, and most importantly, has a solid theoretical foundation and can be implemented in practice easily. Simulation results show that the control system is rapid, adaptive, robust, and meanwhile, the quality of service （QoS） is guaranteed.

关键词： ATM networks ABR traffic Time-delay Fuzzy-immune controller Robust stabilization

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A tightly coupled finite field arithmetic hardware in an FPGA-based embedded processor core for elliptic curve cryptography

A tightly coupled finite field arithmetic hardware in an FPG...

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International Conference on Electronic Design (ICED)

作者： Mohamed Khalil-Hani Arif Irwansyah Y.W. Hau VLSI-eCAD Research Laboratory (VeCAD) Department of Microelectronic and Computer Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

This work presents the implementation of a tightly-coupled hardware architectural enhancement to the Altera FPGA-based Nios II embedded processor. The goal is to accelerate finite field arithmetic operations in the binary fields of F 2 163 and F 2 193 , for application in a high-performance embedded system implementing elliptic-curve cryptography (ECC). The concept is to augment the embedded processor with a few custom instructions for fast finite field arithmetic operations. Instead of a co-processor, hardware acceleration of the arithmetic operation is provided by custom logic tightly coupled to the processor core and directly controlled by the instruction stream. This concept, which may be considered as a hardware-software codesign approach, is evaluated by prototyping an elliptic curve cryptosystem (ECC) on an Altera Stratix FPGA development board. Experimental results show that for the point multiplication operation, which is the core operation in an ECC computation, the implementation with custom instructions and tightly-coupled hardware is about 50% faster than the coprocessor based hardware.

关键词： Galois fields Arithmetic Hardware Elliptic curve cryptography Acceleration Coprocessors Embedded system Logic Prototypes Field programmable gate arrays

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Facial Expression Imitation in Human Robot Interaction

Facial Expression Imitation in Human Robot Interaction

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17th IEEE International Symposium on Robot and Human Interactive Communication (RO-MAN 2008), vol.1

作者： S. S. Ge C. Wang C. C. Hang Social Robotics Laboratory Interactive Digital Media Institute and Edutainment Robotics Laboratory Department of Electrical and Computer Engineering National University of Singapore Singapore

In this paper, we propose an interactive system for reconstructing human facial expression. In the system, a nonlinear mass-spring model is employed to simulate twenty two facial muscles' tensions during facial expressions, and then the elastic forces of these tensions are grouped into a vector which is used as the input for facial expression recognition. The experimental results show that the nonlinear facial mass-spring model coupled with the SVM classifier is effective to recognize the facial expressions. Finally, we introduce our robot that can make artificial facial expressions. Experimental results of facial expression generation demonstrate that our robot can imitate six types of facial expressions.

关键词： Robots

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