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engineering installation works on FTTH-PON laboratory test bed: Case study

Journal of Applied Sciences 2010年第1期10卷 29-36页

作者： Ab-Rahman, M.S. Ng, B.C. Kasimin, R. Jumari, K. Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronic and System Engineering Faculty of Engineering and Built Environment Universiti Kebasgsaan Malaysia 43600 UKM Bangi Selangor Malaysia

This study introduces a low cost technique for testing and monitoring process that can be applied specifically for Fiber-to-the-Home Passive Optical Network (FTTH-PON). The simplest and low cost method would be using a Optical Power Meter (OPM) which is able to detect the total loss on the network. However, to identify faulty sections of a network, segmentation need to be done together with the optical power meter. Another testing and troubleshooting method would be using the Optical Time-Domain Reflectometer (OTDR). The OTDR within the network is able to detect the component that causes losses in the network. However, elements acting as a power splitter are not being able to be detected by the OTDR. Therefore, the Access Control system (ACS) is developed to bypass those elements and allows the use of OTDR entirely. This method is proven to be a faster method than the first. Additionally, it can be upgraded to monitor the line status by accumulate all the result in one display computer screen. But this mechanism is not interested to be discussed detail in this study. The new configuration of FTTH is named as modified FTTH. In the end, we compare the installation cost between the conventional and modified FTTH for different network size according to number of users. © Asian Network for Scientific Information.

关键词： Fiber to the x

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Two-phase Particle Swarm Optimization with Scale-free Network Model

Two-phase Particle Swarm Optimization with Scale-free Networ...

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International Conference on Computational Aspects of Social Networks, CASON

作者： Huaping Mu Changyi Jiao Jianchao Zeng Department of Electronic Information Engineering Hebi College of Vocation and Technology Hebi China Division of System Simulation and Computer Application Taiyuan University of Science and Technology Taiyuan China

Enlightened by the properties of scale-free network model, BA model is extended and introduced into particle swarm optimization, and a novel two-phase particle swarm optimization with scale-free network model (TPSO-SNM) is proposed. At the early stages of the algorithm, particles are randomly distributed in a ring, new particles are continuously added into the structure based on the node degree and the distance between nodes. At the same time, the global optimum in evolution equation is substituted with the average optimal location in neighborhood. Simulation results show that the new method has better ability to find the global optimum solution.

关键词： Particle swarm optimization Heuristic algorithms Convergence Computational modeling Mathematical model Simulation Clustering algorithms

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Double protection charger for Li-Ion battery

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World Electric Vehicle Journal 2010年第2期4卷 379-385页

作者： Lu, Shuh-Tai Chen, Ren-Her Sie, Wun-Tong Liu, Kuen-Chi Computer Science and Information Engineering Ching Yun University No. 229 Jiansing Rd. Jhongli City Taoyuan County32097 Taiwan Chung-Shan Institute of Science and Technology Electronic Systems Research Division P.O. Box 90008-22-17 Lung-Tan Taoyuan County32599 Taiwan Chung-Shan Institute of Science and Technology System Development Center No. 566 Lane 134 Longyuan Rd. Lung-Tan Taoyuan County325 Taiwan

A low cost battery charger is introduced in this paper. The charging feature meets the requirement of a Li-Ion rechargeable cell designed for electric vehicles and manufactured by E company. The charger is capable of constant current/constant voltage charging strategy, double over current/voltage protection and automatically offloaded with a sound alarm when the charging current is smaller than about 40mA. A detail circuit diagram and its operation principle are proposed and some experimental results are also given. All devices used in the charger circuit are very common and easily purchased. Because of its simple structure only a few modifications are needed to make one's own specific charger. © 2010 WEVA.

关键词： Charging (batteries)

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Analytical analysis of limited power penalty on optical cross add and drop multiplexer (OXADM) - With OXC comparison

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Journal of Optical Communications 2009年第3期30卷 179-185页

作者： Ab-Rahman, Mohammad Syuhaimi Md. Nor, Mohd Khairul Anwar Dollah, Mohd Norhisham Department of Electrical Electronic and System Engineering Spectrum Technology Research Division Computer and Network Security Research Group 43600 UKM Bangi Selangor Malaysia

This paper highlights the limited power penalty condition of OXADM that effect the number of maximum nodes that can be cascaded in optical network. If the limited power penalty condition is violated, the power penalty will become infinity. The condition for limited power penalty for OXADM occur when incoherent crosstalk multiply with the number of maximum nodes;(MN-1)L. Therefore the value must be less than 174, otherwise it will become infinity. It was found that as the number of ports and number of carriers increase, the number of maximum nodes decrease. When compared with conventional OXC device, it was found that the number of maximum nodes for OXC is larger than OXADM. This is due to large power penalty in OXADM. In addition, the accumulation function in OXADM reduces the scalability of this device. The objective of this paper is to study the limited power penalty condition of OXADM in order to avoid infinity. In addition, according to the limited power penalty condition, the relationship between number of maximum nodes against number of ports and number of carriers are also studied. Hence, the results are compared with conventional OXC device.

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A New Vector Particle Swarm Optimization for Constrained Optimization Problems

A New Vector Particle Swarm Optimization for Constrained Opt...

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International Joint Conference on Computational Sciences and Optimization, CSO

作者： Chao-li Sun Jian-chao Zeng Jeng-Shyang Pan Division of System Simulation and Computer Application Taiyuan University of Science and Technology Taiyuan China Department of Electronic Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

A new vector particle swarm optimization (NVPSO) is proposed to solve constrained optimization problems in this paper. In NVPSO, we introduce a shrinkage coefficient to ensure that all dimensions of a particle are within lower and upper bounds, and a new function to determine whether the particle is within the feasible region. One-dimensional search optimization methods are selected in NVPSO algorithm to produce a new position which is guaranteed to be in the feasible region for the particle which escapes from the feasible region. The whole process is dealt as vector mode. The experimental results show that the principle of NVPSO this paper proposed is simple, relatively effective and efficient.

关键词： Particle swarm optimization Constraint optimization Upper bound Computational modeling computer simulation computer applications Optimization methods Chaos Sun Stochastic processes

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Embedded ethernet microcontroller for optical monitoring

Embedded ethernet microcontroller for optical monitoring

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International Conference on Space Science and Communication (IconSpace)

作者： Mohamad Syuhaimi Ab-Rahman Mohamad Najib Mohamad Saupe Aswir Premadi Kasmiran Jumari Spectrum Technology Division Computer and Network Security Group Department of Electrical Electronic and System Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

In this paper, we presented the embedded Ethernet microcontroller for optical monitoring. This design is used for fiber monitoring in the FTTH system. The embedded Ethernet microcontroller is used to control the 1x8 optical switches where this switch is to reroute the optical signal in the FTTH system. These systems consisting of two primaries part communicating each other: (i) A server consisting of a microcontroller PIC18F97J60 with built-in embedded Ethernet controller module and (ii) a client computer. In this system, a microcontroller system is act like web server that store the web pages in their memory, a client computer can access this web page using web browser to monitor and control the microcontroller where the microcontroller is used to control the path of the optical signal by using optical switch.

关键词： Ethernet networks Microcontrollers Monitoring Control systems Optical control Optical switches Optical fiber subscriber loops Web pages Embedded computing Web server

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Modeling, simulation and experimental validation of a generation system for Medium-Voltage DC Integrated Power systems

Modeling, simulation and experimental validation of a genera...

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IEEE Electric Ship Technologies Symposium, ESTS

作者： G. Sulligoi A. Tessarolo V. Benucci M. Baret A. Rebora A. Taffone Department of Electrical Electronic and Computer Engineering University of Trieste Italy Ship System-5th Division/Propulsion and Energy NAVARM Italian Navy Rome Italy Test Room & Quality Department ASI Ansaldo S.p.A. Monfalcone Italy Business Development Unit Ansaldo Ricerche S. p. A. Genoa Italy Automation Department Ansaldo Energia S.p.A. Genoa Italy

In this paper, a demonstrative technological implementation of a shipboard 2.15 MVA generation system is described along with its modeling, numeric simulation and some factory tests. The system, named Naval Package (NP), is part of a demonstrative programme commissioned by Italian Navy for preliminary evaluations of Medium-Voltage DC (MVDC) supply technologies aimed at equipping her future vessels. The NP is made by a dual-star alternator, whose two stator three-phase windings respectively feed two diode-rectifier full-bridges. The alternator (rated speed 6300 rpm) is designed to be moved by a 22000 rpm gas turbine through a gearbox. This paper will present NP innovative issues, with reference to design solutions, operative requirements, dynamic modeling under normal and faulty conditions and some factory tests.

关键词： Power system modeling Power system simulation DC generators Power generation Medium voltage Production facilities Alternators Numerical models Numerical simulation system testing

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Reduction of radiated electromagnetic interference in 4-phases pulse width modulation converter system

Reduction of radiated electromagnetic interference in 4-phas...

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Electrical Design of Advanced Packaging and systems Symposium, EDAPS

作者： Hee-Jung Kim Hyun Kim Seung-Young Ahn Il-Young Oh Jong-Gwan Yook Department of Electrical and Electronic Engineering Yonsei University Seoul South Korea Computer System Division Samsung Electronics Limited Suwon Gyeonggi South Korea

Radiated electromagnetic interference (EMI) in pulse width modulation (PWM) converter system is analyzed using discrete time Fourier series (DTFS) and a snubber circuit. The causes of radiated EMI are found through DTFS analysis of output waveform of switched voltage. By designing a snubber circuit with resistor (R) and capacitor (C) filter, overshoot and ringing of switched voltage are suppressed and the EMI is also reduced. The important factors are to minimize peak voltage and to reduce power dissipation in selecting of RC value. The design of snubber circuit is considered these points and measured EMI shows the improvement of 6 dBuV/m.

关键词： Electromagnetic interference Pulse width modulation converters Snubbers Voltage Pulse width modulation EMP radiation effects Pulse circuits Electromagnetic analysis Time series analysis Fourier series

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Coupled-ring reflector laser diodes composed of squared ring waveguides

Coupled-ring reflector laser diodes composed of squared ring...

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IEEE/LEOS International Conference on Optical MEMS

作者： Suhyun Kim Doo Gun Kim Nadir Dagli Youngchul Chung Young Tae Byun Intelligent System Research Division Korea Institute of Science and Technology Seoul South Korea Department of Electronics and Communication Engineering Kwangwoon University Seoul South Korea School of Electronic and Electrical Engineering Chung Ang University Seoul South Korea Department of Electrical and Computer Engineering University of California Santa Barbara USA

Coupled-ring reflector laser diodes composed of squared ring waveguides are fabricated and it is demonstrated that the laser diodes exhibit single mode operation and 15 nm tuning range with SMSR exceeding 25 dB.

关键词： Semiconductor lasers Optical ring resonators Optical waveguides Ring lasers Waveguide lasers Semiconductor diodes Mirrors

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Proposal of VLIW Architecture for Application Specific Processors with Built-in-Self-Repair facility via Variable Accuracy Arithmetic

Proposal of VLIW Architecture for Application Specific Proce...

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IEEE Design and Diagnostics of electronic Circuits and systems (DDECS)

作者： Pawel Pawlowski Adam Dabrowski Mario Scholzel Chair of Control and System Engineering Division of Signal Processing and Electronic Circuits Poznań University of Technology Poznan Poland Department of Computer Science Brandenburg University of Technology Cottbus Germany

A new proposal of a very long instruction word (VLIW) architecture for application specific processors with the built-in-self-repair (BISR) facility realized by means of the variable accuracy arithmetic has been described in this paper. The proposed idea, which is particularly interesting for the portable embedded systems, is based on a novel two accumulator model, which is used in order to obtain high accuracy of the result of a series of floating-point additions. The goal of the proposed approach consists in ensuring the functionality of the system even in case of permanent faults of particular building blocks, e.g., of one of the floating point adders. Instead of decreasing the performance of the system or providing redundant hardware, as it is typically done in other approaches, in our present concept merely the accuracy of the floating point accumulation is reduced. Therefore, although the quality of service is reduced, the performance and the overall functionality of the system may remain unchanged. By this means we can also control the power consumption, saving the power with the cost of the somehow reduced signal processing accuracy.

关键词： Proposals VLIW Application specific processors Arithmetic Embedded system Hardware Quality of service Energy consumption Costs Signal processing

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