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The proposal of OXADM application in FTTH network

Journal of Optical Communications 2009年第2期30卷 99-103页

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

With the drastically growth in optical communication technology, a lossless, low-crosstalk and multifunction optical switch is most desirable for large-scale photonic network. To realize such a switch, we have introduced the new architecture of optical switch that embedded many functions on single device. The asymmetrical architecture of OXADM consists of 3 parts;selective port, add/drop operation, and path routing. The unique features offered by OXADM has extended its application to Fiber to-the Home Technology (FTTH), here the OXADM is used as a wavelength management element in Optical Line Terminal (OLT). Each port is assigned specifically with the operating wavelengths and with the dynamic routing management to ensure no traffic combustion occurs in OLT. Protection and restoration mechanisms have been applied in backbone networks, but access networks are not considered significantly in the scope of survivability. Towards that, this paper describes our recent approach toward advanced customer access network through the development of an access control system (ACS). The ACS focuses on providing survivability through the OXADM restoration scheme against failure by means of dedicated and shared protection that is applied in FTTH-EPON. A next feature is the high speed restoration achieved by automatic re-routing using fiber status monitoring. Each OXADM has a node controller which receives reports on the status periodically from access control system (ACS). When a failure is detected, The ACS will send a command to the related OXADM to be activated. The proposed restoration system is the first in its kind which covers the survivability in the drop section of FTTH access network.

关键词： Restoration

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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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OSNR analysis on optical cross add and drop multiplexer (OXADM) in ring metropolitan (CWDM) network: The analytical approach

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Journal of Optical Communications 2009年第4期30卷 195-199页

作者： Ab-Rahman, Mohammad Syuhaimi Ling, Tan Sue Ee, Amy Teng Sing Zaharah, Lina Jaafar, Faridah Universiti Kebangsaan Malaysia Department of Electrical Electronic and System Engineering Computer and Network Security Research Group 43600 UKM Bangi Selangor Malaysia

The optical device model named Optical Cross Add and Drop Multiplexer (OXADM) uses the combined concepts of optical add/drop multiplexing and optical cross connect between two main transmission lines in order to implement the wavelength routing operation. The device can operate in point-to-point, ring or mesh network topology. In a ring metropolitan network, the OXADMs are located in the nodes, which provide functionalities such as transport, multiplexing, routing, supervision and survivability of client signals processed predominantly in optical domain. The objective of this paper is to analyze the OSNR for OXADM ring network with assumptions to determine the connections between each component in the network and the OSNR using Matlab. The analysis results can help in determining a better configuration of OXADM devices in a ring metropolitan network.

关键词： Drops

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Effective treatment of chronic radiation proctitis using radiofrequency ablation

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Therapeutic Advances in Gastroenterology 2009年第3期2卷 149-156页

作者： Zhou, Chao Adler, Desmond C. Chen, Yu Tsai, Tsung-Han Fujimoto, James G. Becker, Laren Figueiredo, Marisa Mashimo, Hiroshi Schmitt, Joseph M. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA United States VA Boston Healthcare System Harvard Medical School MA United States LightLab Imaging Inc. Westford MA United States

Endoscopic argon plasma coagulation and bipolar electrocautery are currently preferred treatments for chronic radiation proctitis, but ulcerations and strictures frequently occur. Radiofrequency ablation (RFA) has been successful for mucosal ablation in the esophagus. Here we report the efficacy of RFA with the BarRx Halo⁹⁰ system in three patients with bleeding from chronic radiation proctitis. In all cases, the procedure was well tolerated and hemostasis was achieved after 1 or 2 RFA sessions. Re-epithelialization of squamous mucosa was observed over areas of prior hemorrhage. No stricturing or ulceration was seen on follow-up up to 19 months after RFA treatment. Real-time endoscopic optical coherence tomography (EOCT) visualized epithelialization and subsurface tissue microvasculature pre- and post-treatment, demonstrating its potential for follow-up assessment of endoscopic therapies. © 2009, SAGE Publications. All rights reserved.

关键词： Chronic radiation proctitis Endoscopic optical coherence tomography (EOCT) Endoscopic therapy Lower gastrointestinal bleeding Radiofrequency ablation (RFA)

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Broadcast signal transmission employing low noise mutually injected Fabry-Pérot laser diodes

Broadcast signal transmission employing low noise mutually i...

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Frontiers in Optics, FiO 2009

作者： Mun, Sil-Gu Oh, Sang-Min Choi, Ki-Man Lee, Chang-Hee Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Youseong-gu Daejeon 305-701 Korea Republic of Next Generation Research Department Korea Telecom Network Technology Laboratory Daejeon Korea Republic of

We demonstrated a broadcast signal transmission using mutually injected Fabry-Pérot laser diodes. It can accommodate 125 channels of HDTV signals with 100 GHz channel spacing. © 2009 Optical Society of America.

ISBN: (纸本)9781557528780

关键词： Digital television

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Heterogeneous sensors alignment on ART for map construction

Heterogeneous sensors alignment on ART for map construction

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IEEE Region 10 International Conference TENCON

作者： Wen-Yo Lee Yu-Kuen Tsai Chun-Wei Chen Ta-Chih Hung Min-Hao Lee Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Mechanical and System Research Laboratory Industrial Technology and Research Institute Hsinchu Taiwan

This paper proposes a common platform called automatic robot toolkit (ART), which offers a message stream dispatch mechanism and system development toolkit for robots. Composing a robotic system requires several heterogeneous components that are different hardware, algorithms and software. Each component is integrated into a well designed robotic system. Those systems are designed based on a particular system and it can be hard to have integration with or within other systems. Nowadays, robotics are more and more complex and intelligent. A common platform could be used to integrate those components according to the object concept. Therefore, the best way is to develop a common platform to integrate the already existing or developing techniques. The proposed common platform offers the message channels for each technique component to subscribe and publish the component's information. The common platform is designed based on the message oriented middleware (MOM) concept which effectively abstracts a multi-channel message transport layer to enable asynchronous exchange of data and event notification. Using this middleware toolkit, one can develop the control, identification, or intelligent algorithms without coding platform constraint.

关键词： Subspace constraints Mobile robots Robot sensing systems Middleware Intelligent robots Legged locomotion Robotics and automation Mechanical sensors Sensor systems Hardware

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A novel method to implement an interactive mobile robot

A novel method to implement an interactive mobile robot

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IEEE Workshop on Advanced Robotics and its Social Impacts, ARSO

作者： Wen-Yo Lee Jhu-Syuan Guo Chan-An Pao Ta-Chih Hung Computer Information and Network Engineering Lunghwa University of Science and Technology Taoyuan Taiwan Mechanical and System Research Laboratory Industrial Technology and Research Institute Hsinchu Taiwan

This paper presents a novel method to implement an interactive mobile robot. The proposed mobile robot is implemented under the technique of mixed reality. The mixed reality technique is realized by both the Virtools tool and mobile robot. There are three basic interactive behaviors of human beings have been implemented on this proposed mobile robot. There are target navigation behavior, face tracking behavior, and obstacle avoidance behavior; the three behaviors are designed by the fuzzy rules method, respectively. These behaviors lead to the proposed path planning strategy possibly. On the other hand, a novel path planning strategy for a mobile robot is given in this paper. The path planning strategy is according to the experience that the mobile robot has been experienced in target navigation. Experiments show that the proposed behaviors are well designed. With the basic ability of the behaviors, the proposed robot can automatically learn from the previous navigation experience and can optimize the path planning.

关键词： Mobile robots Face Humans Navigation Robot sensing systems

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Ideal perfect multilevel threshold secret sharing scheme

Ideal perfect multilevel threshold secret sharing scheme

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5th International Conference on Information Assurance and Security, IAS 2009

作者： Lin, Changlu Harn, Lein Ye, Dingfeng Key Laboratory of Network Security and Cryptology Fujian Normal University China State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences China Key Laboratory of Communication and Information System Beijing Jiaotong University Beijing Municipal Commission of Education China Department of Computer Science Electrical Engineering University of Missouri-Kansas City United States

ISBN: (纸本)9780769537443

Shamir proposed the first (t, n) threshold secret sharing scheme. Shamir's scheme is ideal and perfect. In this paper, we propose two modifications of Shamir's secret sharing scheme. In our first modification, each shareholder keeps both x-coordinate and y-coordinate of a polynomial as private share. In our second modification, dealer uses polynomial with degree larger than the threshold value t to generate shares for a (t, n) threshold scheme. We show that these two modified schemes are ideal and perfect. Using these two modifications, we design a multilevel threshold secret sharing schemes (MTSS). We prove that the proposed scheme is secure. © 2009 IEEE.

关键词： Information theory

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Swarm Robots Long Term Autonomy Using Moveable Charger

Swarm Robots Long Term Autonomy Using Moveable Charger

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International Conference on Future computer and Communication, ICFCC

作者： Farshad Arvin Khairulmizam Samsudin Abdul Rahman Ramli Computer Systems Research Group Department of Computer System Engineering University of Putra Malaysia Serdang Malaysia Intelligent System and Robotic Laboratory Institute on Advanced Technology University of Putra Malaysia Serdang Malaysia

This paper proposes an alternative docking charger station for mobile robots. One crucial task in swarm robots scenario is to find low battery robots and recover them. Overcoming this problem requires a versatile mobile charging station that is able to actively locate and charge inactive mobile robots unlike the conventional stationary docking stations. The mobile charger robot should perform independent tasks other than the swarm robots global task. It uses similar communication method with other swarm robots, however new preprogrammed instructions are required to facilitate battery charging task for swarm robots.

关键词： Mobile robots Batteries Intelligent robots Service robots Robotics and automation computer interfaces Portable computers Robot sensing systems Humans Navigation

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Agile hardware development with rapid hardware definition language

Agile hardware development with rapid hardware definition la...

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IEEE International Conference on Electro-Information Technology

作者： Jacob N. Allen Hoda S. Abdel-Aty-Zohdy Robert L. Ewing Microelectronics System Design Laboratory Department of Electrical and Computer Engineering Oakland University Rochester Hills MI USA Air Force Research Laboratory OH USA

Rapid HDL is a hardware definition language developed in C# for the Microsoft .Net platform. Rapid HDL unifies digital FPGA hardware development and co-software integration. Hardware is scripted using reusable software objects, communication between hardware and software is automatic, and synthesis is automated using a free tool chain. Rapid HDL represents 18,000 lines of code and is freely available under the MIT license.

关键词： Hardware design languages Software libraries Testing Licenses Microelectronics Force sensors Field programmable gate arrays Software reusability Software tools High level languages

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