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International Conference on Information Management and engineering, ICIME

作者： M.F. Misman S. Deris S.Z.M. Hashim R. Jumali M.S. Mohamad Artificial Intelligence and Bioinformatics Laboratory Department of Software Engineering Faculty of Computer Science and Information System Universiti Teknologi Malaysia Skudai Johor Malaysia

ISBN: (纸本)9781424437740

In this review, we have discussed about approaches in pathway based microarray analysis. Commonly, there are two approaches in pathway based analysis, Enrichment Score and Supervised Machine Learning. These pathway based approaches usually aim to statistically define significant pathways that related to phenotypes of interest. Firstly we discussed an overview of pathway based microarray analysis and its general flow processes in scoring the pathways, the methods applied in both approaches, advantages and limitations based on current researches, and pathways database used in pathway analysis. This review aim to provide better understanding about pathway based microarray analysis and its approaches.

关键词： Linear feedback shift registers Random number generation Shift registers Cryptography Random sequences Feedback circuits State feedback Flip-flops Information management computer science

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Improved image watermarking using pixel averaging and unbiased retrieval

Improved image watermarking using pixel averaging and unbias...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Thitiporn Pramoun Thumrongrat Amornraksa Multimedia Communication Laboratory Computer Engineering Department Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand

digital watermarking based on pixels modification for color image is considered in this paper. Its operations are described and its performance is investigated. Based on our observations, a method based on pixel averaging and unbiased watermark retrieval is proposed in order to improve the efficiency of the considering watermarking method. Particularly, we first apply the pixel averaging technique to create the localized luminance component, and used it to fine tune the watermark signal strength. We then remove some biased watermarked pixels in the watermark retrieval process to increase accuracy of the recovered watermark. The experimental results show the watermark retrieval improvements in term of NC, compared to the previous watermarking methods. The robustness against different types of attack at various strengths is also evaluated and compared.

关键词： Watermarking Pixel Image retrieval Streaming media Color Frequency domain analysis Discrete wavelet transforms Multimedia communication Laboratories Electronic mail

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MedSiGRe: Medical Signal Grid Repository, an integration to Italica project

MedSiGRe: Medical Signal Grid Repository, an integration to ...

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6th IEEE/IFIP Latin American Network Operations and Management Symposium, LANOMS 2009

作者： Milano, Federico Eijo, Juan Francisco Garcia Gomez, Adrian De Quiros, Fernan Gonzalez Bernaldo Risk, Marcelo Department of Information Systems Engineering Buenos Aires Regional Faculty National Technological University Argentina Laboratory of Complex Systems Department of Computer Science University of Buenos Aires Argentina Department of Biomedical Informatics Italian Hospital of Buenos Aires Argentina

ISBN: (纸本)9781424445509

The Italica Project is the implementation of an Electronic Health Record system at the Italian Hospital of Buenos Aires. The present work shows the implementation of a Medical Signal Grid Repository module and its integration to the Italica Project. We also describe the architecture of that module and explain the design decisions taken for its construction. The integration to the preexisting system is also presented, together with the difficulties that arose from the insertion of a data grid in an environment not used to this technology. Several issues about the security and reliability of the medical data are treated as well. In this paper we also discuss the use of the grid repository as a starting point for the development of distributed processing applications. ©2009 IEEE.

关键词： Integration

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The Implementation of a New All-digital Phase-Locked Loop on an FPGA and Its Testing in a Complete Wireless Transceiver Architecture

The Implementation of a New All-Digital Phase-Locked Loop on...

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Annual Conference on Communication Networks and Services Research (CNSR)

作者： Munir Ahmad Tarar Ji Sun Adam Sampson Ryan Wilcox Zhizhang Chen Microwave and Wireless Research Laboratory Department of Electrical and Computer Engineering Dalhousie University Halifax NS Canada High Capacity Digital Communications Laboratory Department of Electrical & Computer Engineering University of Alberta Edmonton AB Canada

In this paper a novel user-friendly implementation of an all-digital phase-locked loop (ADPLL) is *** novelty lies in the fact that the very basic functions of the ADPLL are kept in the top module Verilog *** the normal design practice, all of the main math functions were implemented using the sub-modules placed outside but called from within the top *** way ADPLL can be easily implemented in a low-cost FPGA. Further, the implementation details of an ADPLL, which are not reported previously in a singles hot, are described altogether for the first time. The reconfigurable ADPLL is then implemented in a transceiver architecture and tested with real signals received wirelessly. The recovered IQ constellation EVM of 9.0336% was obtained, which is quite *** proves the feasibility of the ADPLL not only in simulations but in a real communication system. The ADPLL designed this way can be used in any communication system, although preferably for high data rate transceiver applications.

关键词： Phase locked loops Field programmable gate arrays Testing Transceivers Frequency synchronization Frequency conversion Baseband Hardware design languages Costs Frequency synthesizers

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Comparison between noise reduction algorithms for speech signals using auditory masking effects

Comparison between noise reduction algorithms for speech sig...

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IEEE GCC Conference & Exhibition

作者： Mehdi Yektaeian Rassoul Amirfattahi Digital Signal Processing Research Laboratory Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan Iran

Auditory masking is aggressively exploited by algorithms used for the lossy compression of audio signals. In compression of audio signals, the intent is to hide the noise introduced by the coding below the masking threshold, thus making the noise inaudible. This will render the coding process transparent, enabling better compression without audible degradation of the signal. In this article, we show that using masking properties of the hearing system allows for improved noise reduction. A novel method for noise reduction in speech signals is proposed. This method is shown to outperform non-auditory based methods, and compares well with other perceptually motivated noise reduction methods. It is found that the proposed method, Soulodre's PNRF combined with the ITU's PEAQ auditory model, have more musical noise but less signal distortion than the method proposed by Tsoukalas, which obtain marginally better results in informal testing results.

关键词： Signal to noise ratio Noise reduction Speech Speech enhancement Masking threshold

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Design of new 4-channel FTTH Mux/Demux based on cascaded wavelength selective coupler

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Journal of Optical Communications 2009年第2期30卷 80-85页

作者： Ab-Rahman, Mohammad Syuhaimi Computer and Network Security Research Group Department of Electrical Electronic and System Faculty of Engineering and Bulit Environmnet 43600 UKM Bangi Selangor Malaysia

The purpose of this paper is to design and characterize the Multiplexer/Demultiplexer (Mux/Demux) which uses the concept of coupled mode theory. The design is based on cascading the wavelength selective coupler (WSC) devices utilizing commercial specification. The device is designed on silica substrate with compliance of FTTH wavelength such as wavelengths 1310 nm (upstream data/voice), 1480 nm (downstream data/voice), 1550 nm (video) and 1625 nm (testing). The proposal of designed Mux/Demux is used as a router for specific wavelength in order to detect any optical line failure in FTTH network application in which the OTDR launched wavelength (1625 nm) is used as troubleshooting signal. The performance of the devices was modeled using the beam propagation method (BPM-Cad) product from the Optiwave Inc. The device then is characterized in term of output power, insertion loss and true loss measurement.

关键词： Silica

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Development of a 6-axis robotic arm controller implemented on a low-cost microcontroller

Development of a 6-axis robotic arm controller implemented o...

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International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Agus Bejo Wanchalerm Pora Hiroaki Kunieda Embedded System and IC Design Research Laboratory Department of Electrical Engineering Faculty of Engineering Chulalongkom University Thailand Kunieda-Isshiki Laboratory Department of Communication and Integrated Systems Graduate School of Science and Engineering Tokyo Institute of Technology Japan

This paper presents a case study of development of a 6-axis robotic arm controller. The robot is powered by a hydraulic pump. The position of each axis can be derived from its potentiometer voltage. At each and every axis, a servo-valve is employed to control a servo motor. Its relative velocity is related to the servo-valve input. With 2 nd order PID controller, a micro-controller commands movements of all axes. The PID inputs are the six voltages from potentiometers and its outputs are the six DC voltages, which command the six servo-valves. A trajectory file is generated by solving the inverse kinematics problem with some (angular to digital value) conversions. A special case; closed-form calculation is developed to solve kinematics problem. With some constraints it only yields one solution. Experiments show that robot follow the given trajectory with acceptable errors.

关键词： Robot control Microcontrollers Robot kinematics Control systems Potentiometers Communication system control Voltage Servomechanisms Servomotors Service robots

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33-channels multiwavelength generation of L-band Brillouin-erbium fiber laser

33-channels multiwavelength generation of L-band Brillouin-e...

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Conference on Lasers and Electro-Optics Europe (CLEO EUROPE)

作者： Mohammed Hayder Al-Mansoori Mohd Adzir Mahdi Department of Electronics and Communication Engineering Faculty of Engineering Universiti Tenaga Malaysia (UNITEN) Kajang Selangor Darul Ehsan Malaysia Photonics Laboratory Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Selangor Darul Ehsan Malaysia

ISBN: (纸本)9781424440801

In this paper, a novel multiwavelength Brillouin-erbium fiber laser (BEFL) with double-pass BP pre-amplified technique within the linear cavity is experimentally demonstrated. The linear cavity of the laser system is formed by two high reflectivity mirrors placed at both ends of the resonator. The main innovative step in this approach is the use of the erbium-doped fiber amplifier (EDFA) to amplify the Brillouin pump (BP) power twice within the laser cavity before entering the single-mode fiber. Therefore, the proposed fiber laser eliminates the requirement for high external BP power to create the Brillouin gain and suppress the self-lasing cavity modes.

关键词： L-band Fiber lasers Erbium-doped fiber lasers Pump lasers Erbium-doped fiber amplifier Laser modes Power lasers Reflectivity Mirrors Laser excitation

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FPGA-based embedded hand vein biometric authentication system

FPGA-based embedded hand vein biometric authentication syste...

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IEEE Region 10 International Conference TENCON

作者： P. C. Eng M. Khalil-Hani VLSI-eCAD Research Laboratory (VeCAD) Department of Microelectronics and Computer Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Kudai Johor Malaysia

Biometric authentication provides a high security and reliable approach to be used in security access system. However, this authentication method has not been widely implemented in a resource-constrained embedded system. In this project, we investigate a method of personal authentication based on infrared vein pattern in the back of the hand, targeted for embedded system which is implemented in Altera Nios II FPGA prototyping system, running on Real Time Operating system (RTOS). The RTOS applied is Nios2-Linux. A biometric feature is extracted from the vein pattern image and then matched for personal authentication. The algorithm consists of four modules: image capturing, image pre-processing, feature extraction, and the authentication module. These image processing algorithms executed in an embedded system with a 50 MHz fixed point processor. Preliminary experiment on a database of 82 images of 15 candidates show promising result with the system reaching equal error rate of 5.5%.

关键词： Veins Biometrics Authentication Embedded system Security Feature extraction Field programmable gate arrays Prototypes Real time systems Operating systems

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An AES Tightly Coupled Hardware Accelerator in an FPGA-based Embedded Processor Core

An AES Tightly Coupled Hardware Accelerator in an FPGA-based...

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International Conference on computer engineering and Technology, ICCET

作者： Arif Irwansyah Vishnu P. Nambiar Mohamed Khalil-Hani VLSI-eCAD Research Laboratory (VeCAD) Department of Microelectronics and Computer Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia Skudai Johor Malaysia

This paper presents the implementation of a tightly coupled hardware architectural enhancement to the Altera FPGA-based Nios II embedded processor. The goal is to accelerate Advanced Encryption Standard (AES) operations in 128, 192 and 256-bits, for application in a high-performance embedded system implementing symmetric key cryptography. The concept is to augment the embedded processor with a new custom instruction for encryption and decryption operations. In order to show the effectiveness of tightly coupled hardware implementation over coprocessor based approach, we have also realized the design in coprocessor approach using the same AES core. Experimental results show that for the encryption or decryption operations, real implementation with custom instructions and tightly coupled hardware is about 35% faster than the co-processor based hardware.

关键词： Hardware Cryptography Coprocessors Embedded computing Embedded system Acceleration NIST Instruction sets Laboratories Microelectronics

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