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检索条件"机构=Digital System Engineering Laboratory Department of Computer Engineering Faculty of Engineering"

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Spectral amplitude coding OCDMA using AND subtraction technique

Spectral amplitude coding OCDMA using AND subtraction techni...

引用

IEEE International Conference on Telecommunications and Malaysia Communications (ICT-MICC)

作者： S.A. Aljunid M. Othman N.S.M. Shah M.D.A. Samad R.K.Z. Sahabudin M.K. Abdullah School of Computer & Communication Engineering Universiti Malaysia Pedis Kangar Perlis Malaysia Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia Photonics Laboratory Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

A new detection scheme, namely AND subtraction technique is proposed and presented in this paper. The theory is being elaborated and the calculated and simulation results have been done by comparing AND subtraction technique against complementary subtraction technique by using DW code. In this paper we have proved that AND subtraction technique gives better bit error rate (BER) performance than complementary subtraction technique.

关键词： Subtraction techniques Multiple access interference Phase detection Optical computing Bit error rate Optical receivers Optical transmitters Multiaccess communication Telecommunication computing Photonics

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Performance of the optical spectrum CDMA systems in FTTH access network

Performance of the optical spectrum CDMA systems in FTTH acc...

引用

IEEE International Conference on Telecommunications and Malaysia Communications (ICT-MICC)

作者： M. Othman N.S.M. Shah N.A. Cholan R. Talib M.D.A. Samad S.A. Aljunid M.K. Abdullah Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia Photonics Laboratory Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia School of Computer & Communication Engineering Universiti Malaysia Pedis Kangar Perlis Malaysia

Double Weight (DW) code is presented here to support fiber-to-the-home (FTTH) access network in point-to-multipoint (P2MP) applications. This code with basic fixed weight of 2 possess ideal cross correlation properties, that are important characteristics in spectral encoding OCDMA system since these can eliminate multiple user interference and can reduce noise. The performance of DW code against Hadamard code is compared through simulation by using Optisystem version 2.2. The performances were characterized through bit error rate (BER) against number of user for two network designs. One is without erbium doped fiber amplifier (EDFA) and another one is with the EDFA for P2MP network. It is found that DW code is better than Hadamard code for all simulation results at bit rates of 622 Mbps, 1.25 Gbps and 2.5 Gbps.

关键词： Optical fiber networks Multiaccess communication Optical fiber subscriber loops Error correction Error correction codes Bit error rate Erbium-doped fiber amplifier Encoding Interference elimination Noise reduction

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Kinematic simulative analysis of virtual potential field method for AUV trajectory planning

Kinematic simulative analysis of virtual potential field met...

引用

Mediterranean Conference on Control and Automation (MED)

作者： M Barisic Z. Vukic N. Miskovic Department of Computer and Control Engineering Laboratory for Underwater Systems and TechnologiesFaculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper deals with an analysis of applicability, capabilities, benefits and pitfalls of using a virtual potential field approach to autonomously planning trajectories in non-communicating autonomous underwater vehicles (AUV-s). Virtual potentials represent an approach to this problem with cross-layer design features. Examples of different layers of control that can be achieved with the same fundamental approach are: obstacle-avoidance, energy-optimal trajectories, forming up with other moving agents, controlled formation fragmentation into well-posed sub-formation etc. This paper shows, on the basis of extensive simulated experiments, that such a trajectory planner based on virtual potentials, guarantees good extendibility, scalability and performance in a hard-real-time hardware-in-the-loop system.

关键词： Kinematics Analytical models Trajectory Computational modeling computer simulation Electric variables measurement Feature extraction Stability Underwater vehicles Communication system control

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Analysis of the effect of haze on free space optical communication in the Malaysian environment

Analysis of the effect of haze on free space optical communi...

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IEEE International Conference on Telecommunications and Malaysia Communications (ICT-MICC)

作者： B.S.S. Naimullah S. Hitam N.S.M. Shah M. Othman S.B.A. Anas M.K. Abdullah Faculty of Electrical Engineering Universiti Teknologi MARA Sarawak Kota Samarahan Sarawak Malaysia Photonics Laboratory Department of Computer and Communication System Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Department of Communication Engineering Faculty of Electrical and Electronic Engineering Universiti Tun Hussein Onn Malaysia Batu Pahat Johor Malaysia

This paper presents the effect of atmospheric attenuation during hazy days for free space optical (FSO) communication in point-to-point connection. The analysis focuses on scattering coefficient and atmospheric attenuation effects on low visibility, which falls in the range of 1.8 km to 4.5 km. The performance comparison is also done for the wavelength of 850 nm and 1550 nm. The result shows that the performance of 1550 nm is better than 850 nm in both performance parameters. As the link range between transmitter and receiver increases, the atmospheric attenuation increases too. Deployment distance of less than 1km can reduce the effect of atmospheric attenuation. These challenges limit FSO to the short distance application.

关键词： Optical fiber communication Optical scattering Optical attenuators Optical receivers Optical transmitters Mie scattering Space technology Particle scattering Atmospheric waves Attenuation

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Transfer function identification by using self-oscillations

Transfer function identification by using self-oscillations

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Mediterranean Conference on Control and Automation (MED)

作者： N. Miskovic Z. Vukic M. Barisic University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering Laboratory for Underwater Systems and Technologies Zagreb Croatia Faculty of Electrical Engineering and Computing University of Zagreb Laboratory for Underwater Systems and Technologies Zagreb Croatia

The work presented in this paper deals with the process of transfer function identification by using self-oscillation method (autotuning identification method). The algorithm is given in a general matrix form and some modifications are introduced. The modifications of the algorithm include augmentation of the initial algorithm for Type k systems, systems with delays and discrete-time systems. The paper also includes simulation examples which describe the introduced modifications. Apart from being rather simple, this method is applicable to real systems. Its greatest advantage is quick identification of a transfer function (depends on the system).

关键词： Transfer functions Relays Frequency Control systems Control engineering computing Delay systems Vehicle dynamics Open loop systems Delay effects Feedback

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AUTOMATIC BRAIN TUMOR SEGMENTATION USING TISSUE DIFFISIVITY CHARACTERISTICS

AUTOMATIC BRAIN TUMOR SEGMENTATION USING TISSUE DIFFISIVITY ...

引用

IEEE International Symposium on Biomedical Imaging

作者： Azadeh Yazdan-Shahmorad Hesamoddin Jahanian Suresh Patel Hamid Soltanian-Zadeh Radiology Department Henry Ford Health System Medical Image Analysis Laboratory Detroit MI USA Electrical and Computer Engineering Department Wayne State University Detroit MI USA Biomedical Engineering Department University of Michigan Ann Arbor MI USA Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department Faculty of Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424406715;1424406714

Water diffusion measurements have been shown to be sensitive to tissue cellular size, extra cellular volume, and membrane permeability. Therefore, diffusion tensor imaging (DTI) by MRI can be used to characterize highly cellular regions of tumors versus acellular regions, distinguishing cystic regions from solid regions. An automatic segmentation method is proposed in this paper based on a multi-phase clustering algorithm to segment the brain tumors in a feature space extracted from DTI images. The algorithm is applied on images of a total of 20 patients with 4 different types of tumors. The tumor region segmentation was 92% accurate based on the segmentation results using anatomical images and 100% accurate based on biopsy results. In general, the segmentation results obtained by the proposed method revealed a strong agreement with the biopsy results and anatomical images, providing support for the accuracy and robustness of the proposed feature space and the segmentation procedure.

关键词： Neoplasms Image segmentation Diffusion tensor imaging Clustering algorithms Biopsy Permeability measurement Volume measurement Size measurement Biomembranes Magnetic resonance imaging

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Biometric data-based robust watermarking scheme of video streams

Biometric data-based robust watermarking scheme of video str...

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International Conference on Information, Communications and Signal Processing

作者： Sooyeun Jung Dongeun Lee Seongwon Lee Joonki Paik Image Processing and Intelligent System Laboratory Department of Image Engineering Graduate School of GSAIM Chung-Ang University Seoul South Korea Dept. of Computer Engineering Kwangwoon University Seoul Korea Department of Computer Engineering Kwangwoon University Seoul South Korea

ISBN: (纸本)9781424409822;1424409829

In this paper we propose a method that identifies users in latest compressed streaming with their biometric watermark. Since the fingerprint is the most economical and the most widely used biometric feature, the digital fingerprint watermark system can be one of the best biometric security system. In this paper we propose a digital fingerprint watermark technique that can survive under very low bit rate compression. The proposed algorithm consists of preprocessing of the fingerprint image, watermark insertion using discrete wavelet transform, and watermark recovery. The damaged watermark by high compression ratio can be effectively restored with preprocessing before watermark insertion and accumulation of extracted watermarks in the stream. The simulation results show that the extraction accuracy increases over 99% in the highly compressed H.264 streaming.

关键词： Biometrics Robustness Watermarking Streaming media Fingerprint recognition Image coding Discrete wavelet transforms Video compression Security Bit rate

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A Hierarchical Clustering Based on Mutual Information Maximization

A Hierarchical Clustering Based on Mutual Information Maximi...

引用

IEEE International Conference on Image Processing

作者： M. Aghagolzadeh H. Soltanian-Zadeh B. Araabi A. Aghagolzadeh Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran Radiology Image Analysis Laboratory Henry Ford Health System Detroit MI USA Faculty of Electrical and Computer Engineering University of Tabriz Tabriz Iran

Mutual information has been used in many clustering algorithms for measuring general dependencies between random data variables, but its difficulties in computing for small size datasets has limited its efficiency for clustering in many applications. A novel clustering method is proposed which estimates mutual information based on information potential computed pair-wise between data points and without any prior assumptions about cluster density function. The proposed algorithm increases the mutual information in each step in an agglomerative hierarchy scheme. We have shown experimentally that maximizing mutual information between data points and their class labels will lead to an efficient clustering. Experiments done on a variety of artificial and real datasets show the superiority of this algorithm, besides its low computational complexity, in comparison to other information based clustering methods and also some ordinary clustering algorithms.

关键词： Mutual information Clustering algorithms Clustering methods Data mining Data structures Density functional theory Computational complexity Entropy Higher order statistics Probability density function

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Exponential Synchronization of Complex Delayed Dynamical Networks with General Topology

Exponential Synchronization of Complex Delayed Dynamical Net...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 460-918

作者： Tao Liu Georgi M. Dimirovski Jun Zhao Key Laboratory of Integrated Automation of Process Industry Ministry of Education Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China Faculty of Electrical and Computer Engineering SS Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Dogus University Istanbul Turkey

ISBN: (纸本)9781424414970;1424414970

The global exponential synchronization of complex delayed dynamical networks possessing general topology is investigated in this contribution. The network model considered can represent both the directed and undirected weighted networks. Novel delay-dependent linear controllers are designed via Lyapunov stability theory and appropriate property of the coupling matrix. It is shown that the controlled network is globally exponentially synchronized with a given convergence rate. Two examples of typical dynamical networks with coupling delays of this class, one possesses directed and the other with undirected coupling topology, both having a Lorenz system at each node, have been used to demonstrate and verify the novel control design proposed.

关键词： Mentoring topology design control dynamic network Network Exponential network model linear controllers

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Genetic Algorithm Optimization of a CPW-Fed On-Chip Slot Loop Antenna on Photonic Crystal Substrate Using Silicon Micromachining

Genetic Algorithm Optimization of a CPW-Fed On-Chip Slot Loo...

引用

IEEE Radio and Wireless Symposium (RWS formerly RAWCON)

作者： H. Sedaghat-Pisheh M. Naghshi J. Rashed-Mohassel M. Shahabadi H. Aliakbarian F. Razavi University of Tehran Tehran Tehran IR Microwave and Photonics Research Laboratory School of Electrical and Computer Engineering Faculty of Engineering University of Tehran Tehran Iran Department of Electrical Engineering UCLA Los Angeles CA USA

Design, simulation, and optimization of a coplanar waveguide (CPW)-fed on-chip slot loop antenna on photonic crystal silicon substrate are presented. The antenna is designed for 24 GHz because of the existing unlicensed band in this frequency. Silicon is used as substrate to integrate the antenna with active devices toward realization of system on chip (SOC). Because of considerable losses of silicon in this band, we use silicon micromachining to remove some parts of the substrate and to reduce the losses and improve the radiation efficiency. By using the mentioned micromachining, a photonic crystal silicon substrate is realized. The photonic crystal substrate suppresses the surface waves and as a result the radiation efficiency improves. A genetic algorithm (GA) is used to include all of the required characteristics

关键词： Genetic algorithms Slot antennas Photonic crystals Silicon Micromachining Optical losses Design optimization Coplanar waveguides Frequency system-on-a-chip

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