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International Conference on Electrical engineering and Informatics, ICEEI

作者： Ng Boon Chuan Mohammad Syuhaimi Ab-Rahman Aswir Premadi Kasmiran Jumari Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper presented a new approach to monitor the network performance and detect any occurrence of fault in fiber-to-the-home passive optical network (FTTH-PON) using an efficient monitoring system named Smart Access network Testing, Analyzing and Database (SANTAD). An optical time domain reflectometer (OTDR) with 1625 nm laser source is located at central office (CO) and connected to a remote personnel computer (PC) via Ethernet TCP/IP connection. A tapper circuit is designed to allow the OTDR testing signal to bypass the optical splitter in a conventional FTTH-PON when emitted in downstream direction. The key idea is to accumulate all OTDR measurement to be displayed on a PC computer screen for centralized monitoring and advanced data analyzing. The main advantages of this work is to improve the survivability and efficiency of FTTH-PON, while reduce the hands on workload as well as maintenance cost and time. The proposed system was implemented in a FTTH-PON network testbed and the experimental results showed that the proposed system achieves high accuracy in addressing the exact failure location.

关键词： Fault detection Passive optical networks Circuit testing Optical fiber testing computerized monitoring System testing Data analysis Circuit faults Optical fiber networks Remote monitoring

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Portable network Monitoring System for Passive Optical network (PON)

Portable Network Monitoring System for Passive Optical Netwo...

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International Conference on computer Technology and Development (ICCTD)

作者： Boonchuan Ng Mohammad Syuhaimi Ab-Rahman Aswir Premadi Kasmiran Jumari Spectrum Technology Research Division Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

A real-time optical network monitoring system named Smart Access network _ Testing, Analyzing and Database (SANTAD) that combined remote controlling, centralized monitoring and troubleshooting, fault detection, optical switching as well as protection and restoration features is introduced for delivering high quality of services (QoS) for passive optical network (PON). The implementation of SANTAD in PON shows its contribution on obtains the high accuracy in detecting any occurrence of fault and addressing the failure location within 30 seconds. The main advantages of this work are to assists the network operators to manage the PON network system more efficiently, reduce hands on workload, minimize network downtime, and rapidly restore failed services when problems are detected and diagnosed.

关键词： Passive optical networks Remote monitoring Optical fiber networks Fault detection Real time systems System testing Data analysis Spatial databases Centralized control Optical control

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Multistatic Pulse-Wave Angle-of-arrival-assisted relative interferometric RADAR

Multistatic Pulse-Wave Angle-of-arrival-assisted relative in...

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IEEE National Conference on Radar

作者： Jonathan Friedman Thomas Schmid Zainul Charbiwala Mani B. Srivastava Young H. Cho Networked and Embedded Systems Laboratory (NESL) Electrical Engineering Department University of California Los Angeles USA Computer Network Division Information Sciences Institute University of Southern California USA

In this work we propose a Pulse-Wave (PW) extension to the Angle-of-arrival-assisted Radio Interferometry (ARI) technique to dramatically reduce the scan-time and the number of vantage points necessary to obtain high-fidelity target position estimation. Accordingly, we call this enhanced process PW-ARI. PW-ARI is the fusion of data from three domains: time (time-of-flight), phase (relative phase-of-arrival), and angle (direction-of-arrival). It has a number of desirable attributes. Foremost among these are its ability to rapidly image extremely large volumes with high accuracy and dense target clusters, support an infinite number of friendly aircraft while providing stealth operational support, and present a spectrally small footprint to both hostile (evade detection and counter-measures) and friendly (maximize electromagnetic compatibility) systems.

关键词： Radio interferometry Military aircraft Radar cross section Object detection Radar detection Airborne radar Frequency synchronization Radar imaging Payloads Electromagnetic scattering

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Characterizing Transactions on Multi-server systems

Characterizing Transactions on Multi-server Systems

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International Conference on Intelligent networking and Collaborative systems (INCOS)

作者： Dirceu Cavendish Yuji Oie Hiroshi Koide Mario Gerla Network Design Research Center Kyushu Institute of Technology Iizuka Japan Department of CS and Systems Engineering Kyushu Institute of Technology Iizuka Japan Computer Science Department University of California Los Angeles Los Angeles USA

In this paper, we demonstrate how to characterize transactions executed on multi-server systems. The characterization is performed with the help of readily available open source components, and is used to build a mean value analysis model in order to estimate transaction response times for arbitrary loads, as well as system capacity. Although an e-commerce system is used, the characterization method described is applicable to any multi-server system.

关键词： Web server Delay Protocols Performance analysis Routing Filtering Intelligent networks International collaboration Design engineering systems engineering and theory

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A Mean Value Analysis approach to transaction performance evaluation on multi-server systems

A Mean Value Analysis approach to transaction performance ev...

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IEEE Symposium on computers and Communications (ISCC)

作者： Dirceu Cavendish Yuji Oie Hiroshi Koide Mario Gerla Network Design Research Center Kyushu Institute of Technology Lizuka Japan Department of CS and Systems Engineering Kyushu Institute of Technology Lizuka Japan Computer Science Department University of California Los Angeles Los Angeles USA

In this paper, we introduce a mean value analysis based methodology for performance evaluation of transactions executed in a multi server distributed system. We first present probabilistic arguments to investigate under which conditions MVA models provide worst case response times, without large overshoots. Then, we show how to characterize the distributed server system so as to construct a model to predict response times as well as estimate system capacity. Finally, we exemplify the methodology usage via transactions implemented in two distributed Linux systems.

关键词： Performance analysis Delay network servers Queueing analysis Routing Predictive models Algorithm design and analysis Design engineering systems engineering and theory computer science

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Restoration scheme implementation in automatic protection unit for FTTH passive optical network

Restoration scheme implementation in automatic protection un...

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International Conference on Electrical engineering and Informatics, ICEEI

作者： Siti Asma Che Aziz Mohamad Syuhaimi Ab- Rahman Siti Rahayu Hassan Kasmiran Jumari Computer and Network Security Research Group Universiti Kebangsaan Malaysia Malaysia Department of Electrical Universiti Kebangsaan Malaysia Malaysia Electronics and Systems Engineering Universiti Kebangsaan Malaysia Malaysia Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Malaysia

This paper focused on the implementation of automatic device switching to perform in restoration scheme located at distribution fiber section. This protection device is potentially will improve the system efficiency in order to provide the continuous data flow until it reach to the end user. We proposed for immediate split structure in EPON network when the signal is totally split when it pass through the optical splitter. The restoration scheme proposed in this paper was presented and the simulation results proved the system feasibility. The bit error rate (BER) performances are measured by a 1.25 Gb/s non-return-to zero (NRZ) pseudo random binary sequence (PBRS) with a pattern length of 2 31 -1 for the downstream traffic between OLT and 8 ONUs. Our results were obtained by observing bit error rates, eye diagram, and optical power levels.

关键词： Protection Optical fiber subscriber loops Passive optical networks Bit error rate Signal restoration Optical network units Optical fiber devices EPON Optical fiber networks Performance evaluation

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Fabrication and characterization of optical 1x12 fused-taper-twisted polymer optical fiber splitters

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Journal of Optical Communications 2009年第1期30卷 16-19页

作者： Safnal, Mohd Hadi Guna Ab-Rahman, Mohammad Syuhaimi Harun, Mohd Hazwan Universiti Kebangsaan Malaysia 8-402 Kolej Keris mas 43600 Bangi Selangor Malaysia Universiti Kebangsaan Malaysia Department of Electrical Electronic and Systems Engineering Computer and Network Security Research Croup Lab. 43600 Bangi Selangor Malaysia

Optical 1x12 fused-taper-twisted polymer optical fiber (POF) splitters has been fabricated by a perform techni-que. Characterization of the splitter which proposed to be used in short haul communication application was reported. Characterization test on the network were observed. The maximum output power efficiency of the splitter is about 40%.

关键词： Plastic optical fibers

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In-Service Monitoring and Failure Identifying against Fiber Fault in FTTH with Passive In-Line Monitoring (PIM) Device

In-Service Monitoring and Failure Identifying against Fiber ...

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International Conference on Future networks, ICFN

作者： Mohammad Syuhaimi Ab-Rahman Boonchuan Ng Rosmawati Ismail Abang Anuar Ehsan Sahbudin Shaari Computer & Network Security Research Group Department of Electrical Electronics & Systems Engineering Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia Photonic Technology Laboratory Institute of Micro Engineering & Nanoelectronics Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper focuses on developing a passive in-line monitoring (PIM) device prototype, which used to tap out a small ratio of triple-play signals for in-service monitoring and failure identifying against fiber fault in fiber-to-the-home (FTTH) access network. This device will be installed with the main lines in FTTH permanently to allow the technicians to simply connect it to a portable tester unit for transmission surveillance and failure detection. The PIM device is used to sharply determine the location of break point before repairing. A passive taper circuit is required to obtain the optical signals to provide a visual way of monitoring the receiving signal performance. This device is potentially to improve the service reliability and reduce the repairing cost and time.

关键词： Condition monitoring Fault diagnosis Optical fiber devices Optical fiber subscriber loops Circuit faults Optical fiber testing Prototypes Signal processing Circuit testing Surveillance

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Development of Passive In-Line Monitoring (PIM) Device Prototype for FTTH Access network

Development of Passive In-Line Monitoring (PIM) Device Proto...

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International Conference on Future computer and Communication, ICFCC

作者： Boonchuan Ng Mohammad Syuhaimi Ab-Rahman Rosmawati Ismail Abang Anuar Ehsan Sahbudin Shaari Computer & Network Security Research Group Department of Electrical Electronics & Systems Engineering Faculty of Engineering & Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia Photonic Technology Laboratory Institute of Micro Engineering & Nanoelectronics Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper focused on developing a fully passive device prototype named passive in-line monitoring (PIM) device, which used to tap out a small ratio of triple-play signals for monitoring purpose without affecting the transmission in fiber-to-the-home (FTTH) access network. This device will be installed with the main lines in FTTH permanently to allow the field engineers or technicians to simply connect it to a portable tester unit for transmission surveillance and failure detection. The PIM device is used to sharply determine the location of break point before repairing. A passive tapper circuit is required to obtain the optical signals to provide a visual way of monitoring the receiving signal performance. The entire optical components that had been used in the circuit design including connectors, splices, optical isolators, and optical couplers. This device is potentially to improve the service reliability and reduce the repairing cost and time.

关键词： Prototypes Optical fiber subscriber loops Optical network units Optical devices Condition monitoring Optical fiber devices Optical fiber testing Design engineering Circuit testing Surveillance

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Newborn Screening System Based on Adaptive Feature Selection and Support Vector Machines

Newborn Screening System Based on Adaptive Feature Selection...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Sung-Huai Hsieh Yin-Hsiu Chien Chia-Ping Shen Wei-Hsin Chen Po-Hao Chen Sheau-Ling Hsieh Po-Hsun Cheng Feipei Lai Department of Computer Science and Information Engineering National Taiwan University Taiwan Information Systems Office National Taiwan University Hospital Taipei Taiwan Department of Medical Genetics National Taiwan University Hospital Taiwan Graduate Institute of Biomedical Electronics and Bioinformatics National Taiwan University Taiwan Network and Computer Centre National Chiao Tung University Hsinchu Taiwan Department of Software Engineering National Kaohsiung Normal University Taiwan

The clinical symptoms of metabolic disorders during neonatal period are often not apparent, if not treated early irreversible damages such as mental retardation may occur, even death. Therefore, practicing newborn screening is very important to prevent neonatal from these damages. In this paper, the newborn screening system used support vector machines (SVM) classification technique is proposed in place of cut-off value decision to evaluate the metabolic substances concentration raw data obtained from tandem mass spectrometry (MS/MS) and determine whether the newborn has some kinds of metabolic disorder diseases. On the basis of the proposed features, new analytic combinations are identified with superior discriminatory performance compared with the best published combinations. Classifiers built with the feature selection to find C3/C2, C3 and C16 of three key point features achieved diagnostic sensitivities, specificities and accuracy approaching 100%.

关键词： Pediatrics Adaptive systems Support vector machines Support vector machine classification Biochemistry Testing Hospitals Diseases Machine learning Bioinformatics

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