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2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009

作者： Shaari, Sahbudin Ab-Rahman, Mohd Syuhaimi Arif, Noor Azie Azura Mohd Institute of Micro Engineering and Nanoelectronics Universiti Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia Computer and Network Security Research Group Department of Electrical Electronic and Systems Engineering 43600 UKM Bangi Selangor Malaysia

ISBN: (纸本)9781557528773

In this work, we mainly focused on the luminescence properties of ZnS:Mn nanocrystals. Various samples of ZnS:Mn have been characterized at different doping concentration, annealing temperature, speed and rotation time. Luminescent intensity increased with higher annealing temperature, doping concentration but decreased with higher speed and rotation time during stirring process. ©2009 Optical Society of America.

关键词： Zinc sulfide

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Fault-Tolerant Bit-Parallel Multiplier for Polynomial Basis of GF（2^m）

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Journal of Electronic Science and Technology of China 2009年第4期7卷 343-347页

作者： Chiou-Yng Lee Pramod Kumar Meher Chia-Chen Fan Computer Information and Network Engineering Lunghwa University of Science and Technology Department of Communication Systems Institute for Infocomm Research

Novel fault-tolerant architectures for bit-parallel polynomial basis multiplier over GF（2^m）, which can correct the erroneous outputs using linear code, are presented. A parity prediction circuit based on the code generator polynomial that leads lower space overhead has been designed. For bit-parallel architectures, the Moreover, there is incorporation of space overhead only marginal time error-correction is about 11%. overhead due to capability that amounts to 3.5% in case of the bit-parallel multiplier. Unlike the existing concurrent error correction （CEC） multipliers or triple modular redundancy （TMR） techniques for single error correction, the proposed architectures have multiple error-correcting capabilities.

关键词： Fault tolerant system finite field parity prediction.

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Thermal noise effect on receiver sensitivity in FTTH customer access network - Simulation approach

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Journal of Optical Communications 2009年第2期30卷 95-98页

作者： Ab-Rahman, Mohammad Syuhaimi Ng, Boonchuan Safnal, Mohd. Hadi Guna Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment 43600 UKM Bangi Selangor Malaysia

Thermal noise is generated naturally by thermal agitation of electron in a conductor commonly found in optoelectronic (O/E) device. In spite of the optical medium is totally immune to noises but it is not exception to occur in receiver parts. In communication, thermal noises have major influenced to the quality of receiver. It is directly proportional to the resistance and temperature. The lower the thermal noise the higher and expensive is this receiver sensitivity. The paper starts comprehensive study on thermal noise effect to the network performance in terms of bit-error rate (BER), maximum Q-factor, eye height, and maximum distance. Fiber-to-the-home (FTTH) network is used as a test field to study the impact of two different values of thermal noise to the network parameters. We use the receiver sensitivity fixed at -22 dBm to study and analyze the parameters. The Opti-System simulation is used to obtain the desired research objective.

关键词： Q factor measurement

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Matlab-based system for centralized monitoring and self restoration against fiber fault in FTTH

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World Academy of Science, engineering and Technology 2009年 38卷 873-877页

作者： Ab-Rahman, Mohammad Syuhaimi Ng, Boonchuan Jumari, Kasmiran Computer and Network Security Research Group Department of Electrical Electronics and Systems Engineering Faculty of Engineering and Built Environment 43600 UKM Bangi Selangor Malaysia

This paper presented a MATLAB-based system named Smart Access network Testing, Analyzing and Database (SANTAD), purposely for in-service transmission surveillance and self restoration against fiber fault in fiber-to-the-home (FTTH) access network. The developed program will be installed with optical line terminal (OLT) at central office (CO) to monitor the status and detect any fiber fault that occurs in FTTH downwardly from CO towards residential customer locations. SANTAD is interfaced with optical time domain reflectometer (OTDR) to accumulate every network testing result to be displayed on a single computer screen for further analysis. This program will identify and present the parameters of each optical fiber line such as the line's status either in working or nonworking condition, magnitude of decreasing at each point, failure location, and other details as shown in the OTDR's screen. The failure status will be delivered to field engineers for promptly actions, meanwhile the failure line will be diverted to protection line to ensure the traffic flow continuously. This approach has a bright prospect to improve the survivability and reliability as well as increase the efficiency and monitoring capabilities in FTTH. © 2009 ***.

关键词： Fiber to the x

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Learning the Point Gathering Task Using Shared Value Function In Mobile Robots

Learning the Point Gathering Task Using Shared Value Functio...

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International Conference on Advanced computer Control, ICACC

作者： Sriram Raghavan S.V. Raghavan Network Systems Laboratory Department of Computer Science and Engineering Indian Institute of Technology Madras India Network Systems Laboratory Dept. of Computer Science and Engg. Indian Institute of Technology Madras

Managing the actions of several agents to perform tasks which require coordination and cooperation pose significant research challenges. One such challenge is to synchronize the agentspsila view of the system to help them take the dasiarightpsila actions. In this paper, we propose an algorithm called MRCPG (Mobile Robot Coordination Point Gathering Algorithm) for coordinating the actions of a team of mobile robots. The aim is to gather these robots at a particular location in a 2-dimensional plane which is determined during execution. The robots are randomly deployed in the plane and they achieve the goal by communicating periodically. In addition, we impose a reinforcement learning framework and the robots learn a shared value function (SVF) based on scalar rewards received. The SVF is used to select the best possible action in each state until at least one robot reaches the goal. Then a reach-distance heuristic is used to direct the remaining robots to the goal. The algorithm was analyzed through simulations for up to 5 robots and the analysis indicates that communication helped robots perform significantly faster than when they acted independently - measured using the path-length of the first robot to reach the goal as the metric. We also observed that increasing team size enhances the effect of communication and hastens task completion.

关键词： Mobile robots Robot kinematics Algorithm design and analysis Performance analysis Intelligent robots Laboratories computer science Inference algorithms Learning Robotic assembly

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Infrared Thermography Based Image Construction for Bio-Medical Applications

Infrared Thermography Based Image Construction for Bio-Medic...

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The 3rd International Conference on Bioinformatics and Biomedical engineering(iCBBE 2009)(第三届生物信息与生物医学工程国际会议)

作者： V.Umadevi S.V.Raghavan Network Systems Laboratory Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai-600036 India

Scanning and imaging techniques, when applied to medicine, are helpful in diagnosis of some critical illnesses that affect human beings. Imaging techniques use the electromagnetic spectrum for the construction of internal anatomy, visibility of organs, and for detection of tumors and other such anomalies. Infrared Radiation (IR), which is part of the electromagnetic spectrum, is a potential alternative in medical imaging, as it is non-invasive and non-ionizing. Thermal (or infrared) radiation emission from human body will be higher around the regions where an anomaly such as a tumor is present inside the body - essentially due to increased cell related activity. In the work reported here we use the IR energy measurement from the body surface to contour a tumor inside. As the radiation and the attendant attenuation are non-linear, it is quite involved to interpret the IR energy measured outside the body. However, we attempt to develop an inverse function to estimate parameters of tumor. We use some strong assumptions (can be described as trivializing the clinical value by medical scientists and practitioners!) to get an exact solution to the “tumor contouring” problem and present a framework called ITBIC as a solution.

关键词： tumor contour thermography framework

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Improved infrared thermography based image construction for biomedical applications using Markov Chain monte carlo method

Improved infrared thermography based image construction for ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： V. Umadevi S. Suresh S. V. Raghavan Network Systems Laboratory Department of Computer Science and Engineering IIT Madras Chennai India Department of Mechanical Engineering IIT Madras Chennai India

Breast Thermography is one of the scanning techniques used for breast cancer detection. Looking at breast thermal image it is difficult to interpret parameters of tumor such as depth, size and location which are useful for diagnosis and treatment of breast cancer. In our previous work (ITBIC) we proposed a framework for estimation of tumor size using clever algorithms and the radiative heat transfer model. In this paper, we expand it to incorporate the more realistic Pennes bio-heat transfer model and Markov chain Monte Carlo (MCMC) method, and analyze it's performance in terms of computational speed, accuracy, robustness against noisy inputs, ability to make use of prior information and ability to estimate multiple parameters simultaneously. We discuss the influence of various parameters used in its implementation. We apply this method on clinical data and extract reliable results for the first time using breast thermography.

关键词： Infrared imaging Biomedical optical imaging Breast cancer Breast neoplasms Cancer detection Heat transfer Monte Carlo methods Information analysis Performance analysis Robustness

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Abstracts from the 2011 Joint Annual Meeting of the Society for Northwestern Vertebrate Biology and Washington Chapter of the Wildlife Society, Held at the Wesley Inn, Gig Harbor, Washington, March 23–25, 2011

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Northwestern Naturalist 2011年第2期92卷 136-166页

作者： Michael J. Adams Christopher A. Pearl Jessica Y. Adkins Daniel D. Roby Ladd Bayliss Peter J. Loschl Donald E. Lyons Yasuko Suzuki Hannah E. Anderson Sarah T. Hamman Keith B. Aubry Catherine M. Raley John J. Rohrer Eric C. Lofroth Scott H. Fitkin Michael L. Best Hartwell H. Welsh Jamie B. Bettaso Don T. Ashton Hartwell H. Welsh Scott McBain Lindsay M. Biga Andrew R. Blaustein Susan F. Brady R. Steven Wagner Daniel J. Selski James E. Johnson R. Bruce Bury Wynn W. Cudmore Hartwell H. Welsh Nathan D. Chelgren Tara Chestnut Chaucney W. Anderson Julie Kirshtein Megan T. Cook Tiffany S. Garcia Stephen Corn Erin Muths Amanda Kissel Rick Scherer Eric Delvin Jonathan D. Bakker Peter W. Dunwiddie Diana L. Dishman Deborah A. Duffield Harriet R. Huber Dyanna M. Lambourn Karen M. Dvornich Greg Falxa Gary M. Fellers Patrick M. Kleeman David Miller Brandon Fessler Jason T. Irwin Daniel D. Beck R. Steven Wagner Marc P. Hayes John A. Frew Christian E. Grue Chris R. Friesen Robert T. Mason Stevan J. Arnold Suzanne Estes Tiffany S. Garcia Katie M. Dugger Josh Johnson Mike Rochelle A. J. Kroll Stephanie S. Gervasi Caren S. Goldberg Dan Davis Erica Bree Rosenblum Bill Bosworth Lisette P. Waits Purnima Govindarajulu Gregory A. Green Steve Negri Jennifer R. Griffiths Daniel E. Schindler Christian E. Grue Karen M. Dvornich Adam G. Hansen David A. Beauchamp Casey M. Baldwin Marc P. Hayes Gretchen Padgett-Flohr Blake R. Hossack Winsor H. Lowe Paul Stephen Corn Aaron N. Johnston Kris Kendell Dave Prescott Scott Stevens Peter M. Kiffney Carol Volk Kerensa A. King Christian E. Grue James M. Grassley Andrew J. Kroll Matt Hane Josh Johnston Mike Rochelle Stuart Farber Niels Leuthold Michael J. Adams John P. Hayes Bo Li Michael T. Brett Kent B. Livezey Ilon E. Logan Teresa J. Lorenz Kimberly A. Sullivan Amanda V. Bakian Deanna Lynch Nancy Thomas Krysten Schuler Steven Jeffries Joshua Malt Kelly R. McAllister Joanne P. Schuett-Hames Aimee P. McIntyre Jay E. Jones Eric M. Lund Frithiof T. Waterstrat Jack N. Giovanini Stephen D. Duke Marc P. Hayes US Forest Service Pacific Northwest Research Station Olympia WA 98512 kaubry@fs.fed.us US Forest Service Okanogan-Wenatchee National Forest Methow Valley Ranger District Winthrop WA 98862 British Columbia Ministry of Environment Victoria BC V8W9M1 Washington Department of Fish and Wildlife Winthrop WA 98862 Humboldt State University 1 Harpst St. Arcata CA 95521 addsmike14@*** US Forest Service Pacific Southwest Research Station 1700 Bayside Dr. Arcata CA 95521 hwelsh@fs.fed.us US Fish and Wildlife Service Arcata Field Office 1655 Heindon Road Arcata CA 95521 jamie_bettaso@fws.gov Redwood Sciences Laboratory US Forest Service1700 Bayview Drive Arcata CA 99521 dashton@fs.fed.us hwelsh@fs.fed.us McBain &amp Trush 980 7th Street Arcata CA 95521 scott@*** Oregon State University Environmental Sciences Graduate Program Corvallis OR 97331 lindsay.biga@science.oregonstate.edu Oregon State University Department of Zoology Corvallis OR 97331 US Geological Survey Forest and Rangeland Ecosystem Science Center 3200 SW Jefferson Way Corvallis OR 97331 buryb@usgs.gov Life Science Department Chemeketa Community College Salem OR 97309 wynn.cudmore@chemeketa.edu US Forest Service Redwood Sciences Laboratory 1700 Bayview Drive Arcata CA 95521 hwelsh@fs.fed.us USGS Oregon Water Science Center 2130 SW 5th Avenue Portland OR 97207 chestnut@usgs.gov USGS Headquarters 12201 Sunrise Valley Drive Reston VA 20192 US Geological Survey Northern Rocky Mountain Science Center Aldo Leopold Wilderness Research Institute 790 E. Beckwith Avenue Missoula MT 59801 scorn@usgs.gov US Geological Survey Fort Collins Science Center 2150 Centre Avenue Building C Fort Collins CO 80526 Department of Biological Sciences Simon Fraser University Burnaby BC V5A 1S6 Colorado State University Department of Fishery and Wildlife Biology Fort Collins CO 80523 The Nature Conservancy 120 Union Ave SE Olympia WA 98501 edelvin@tnc.org School of Forest Resources University of Washington Seattle WA

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The faulty optical fiber mechanism and fault localization techniques in TDM-PON network

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Journal of Optical Communications 2009年第1期30卷 37-43页

作者： Ab-Rahman, Mohammad Syuhaimi Ng, Boonchuan Jumari, Kasmiran Universiti Kebangsaan Malaysia Department of Electrical Electronics and Systems Engineering Computer and Network Security Research Croup 43600 UKM SanglSelangor Malaysia

In this paper, the mechanism of failure (breakdown) detection in an optical fiber line will be studied. The objectives of this paper are to understand in detail the mechanism of faulty fiber and previous recommended fault localization techniques for fiber-to-the-home (FTTH) access network. The detail failure analysis results, failure mechanism, and eliminating solution will be studied and presented. It was reported that any failure in FTTH is affected the triple-play services transmission. Conventionally, a fiber fault in FTTH can be located using optical time domain reflectometer (OTDR) upwardly from customer premises toward central office (CO). Technician is sent to the optical network terminal (ONT) or optical network unit (ONU) side to inject an OTDR pulse into the faulty fiber. This approach would require much time and effort. Moreover, OTDR can only display a measurement result of a line in a time. Therefore, it becomes a hindrance to detect failure of optical line with a large number of customer premises and large coverage area in the fiber plant by using an OTDR. Besides, it is difficult to detect a failure in optical line equipped with passive optical splitter by using a conventional OTDR in the CO downwardly from CO towards the customer premises, because the Rayleigh back-scattered (RBS) light from different branches overlap with each other in the OTDR trace and cannot be distinguished. To overcome these problems to achieve desired network survivability, we introduced a MATLAB-based graphical user interface (GUI) named Centralized Failure Detection System (CFDS), which is potentially used to increase efficiency and flexibility of FTTH, particularly in monitoring the optical signal flow and locating a fiber break downwardly from CO. To perform all the mentioned tasks, interfacing between the developed program with OTDR is required.

关键词： Fiber to the x

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Mask programmable CMOS transistor arrays for wideband RF integrated circuits

Mask programmable CMOS transistor arrays for wideband RF int...

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作者： Rabieirad, Laleh Martinez, Edgar J. Mohammadi, Saeed Department of Electrical Engineering California Institute of Technology Pasadena CA 91125 United States RF Technologies Division Raytheon Network Centric Systems FortWayne IN 46808 United States School of Electrical and Computer Engineering Birck Nanotechnology Center Purdue University West Lafayette IN 47907 United States

A mask programmable technology to implement RF and microwave integrated circuits using an array of standard 90-nm CMOS transistors is presented. Using this technology, three wideband amplifiers with more than 15-dB forward transmission gain operating in different frequency bands inside a 4-22-GHz range are implemented. The amplifiers achieve high gain-bandwidth products (79-96 GHz) despite their standard multistage designs. These amplifiers are based on an identical transistor array interconnected with application specific coplanar waveguide (CPW) transmission lines and on-chip capacitors and resistors. CPW lines are implemented using a one-metal-layer post-processing technology over a thick Parylene-N (15 μm) dielectric layer that enables very low loss lines ( ∼0.6 dB/mm at 20 GHz) and high-performance CMOS amplifiers. The proposed integration approach has the potential for implementing cost-efficient and high-performance RF and microwave circuits with a short turnaround time. © 2009 IEEE.

关键词： Broadband amplifiers

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