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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Costas Troulos Vasilis Merekoulias Vasilis Maglaris Network Management & Optimal Design Laboratory (NETMODE) Department of Electrical and Computer Engineering National and Technical University of Athens Zografou Greece

A business model is presented for managing and expanding municipal Fiber Optical Metropolitan Area networks (MANs) in Greece. It is based on establishing a utility company owned by municipalities within a region, which manages their MANs via a combination of in-sourcing and out-sourcing. The proposed business model addresses issues such as horizontal integration (e.g. extent of municipal utility companies), vertical integration, city interconnection, ownership and organizational structure. We subsequently outline the benefits associated with the proposed model. The paper concludes with a summary of the models expected benefit and future research work.

关键词： Metropolitan area networks Business Optical fiber subscriber loops Optical fiber communication computer network management engineering management Cities and towns Investments Optical fiber networks Companies

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Functional connectivity changes during visual processing associated with grey matter atrophy in Alzheimer's disease

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Alzheimer's & Dementia 2010年第4期6卷 S105-S106页

作者： Michael Ewers Arun L.W. Bokde Jane Park Srinivas Rachakonda Stefan J. Teipel Vince Calhoun Harald Hampel Trinity College Institute of Neuroscience Dublin Ireland & University of California San Francisco San Francisco CA USA Discipline of Psychiatry School of Medicine and Trinity College Institute of Neuroscience (TCIN) Dublin Ireland Mind Research Network Albuquerque NM USA Department of Psychiatry University of Rostock Rostock Germany Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA Department of Psychiatry University of Frankfurt Frankfurt Germany

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Adaptive video-on-demand broadcasting in ubiquitous computing environment

Adaptive video-on-demand broadcasting in ubiquitous computin...

引用

作者： Peng, Chao Tan, Yasuo Xiong, Naixue Yang, Laurence T. Park, Jong Hyuk Kim, Soon-Seok Network Architecture Group National Institute of Information and Communications Technology 4-2-1 Nukui-Kitamachi Koganei Tokyo 184-8795 Japan Graduate School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan Department of Computer Science Georgia State University Atlanta GA United States Department of Computer Science St. Francis Xavier University Antigonish NS B2G 2W5 Canada Department of Computer Science and Engineering Kyungnam University Masan Korea Republic of Department of Computer Engineering Halla University Wonju Korea Republic of

Video-on-demand (VOD) is a service that allows users to view any video program from a server at the time of their choice, such kind of services are expected to be popular in future ubiquitous computing environment. Lots of broadcasting protocols for VOD services have been proposed, but they usually focus only on the tradeoff between bandwidth and delay, thus they are usually not efficient for the local storage. Since the ubiquitous network is heterogeneous and users will have different resource and communication capability, we need to address the storage issue in VOD systems. In this paper, we present several new effective broadcasting schemes, which can intelligently adjust the solution according to available bandwidth and local storage to achieve an ideal waiting time. © Springer-Verlag London Limited 2009.

关键词： Video on demand

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IEEE Workshop on Machine Learning for Signal Processing

作者： Sergey M. Plis Vamsi K. Potluru Vince D. Calhoun Terran Lane Computer Science Department University of New Mexico NM USA Mind Research Network NM USA Electrical and Computer Engineering Department University of New Mexico NM USA

Non-negative matrix factorization (NMF) is an algorithm for decomposing multivariate data into a signal dictionary and its corresponding activations. When applied to experimental data, NMF has to cope with noise, which is often highly correlated. We show that correlated noise can break the Donoho and Stodden separability conditions of a dataset and a regular NMF algorithm will fail to decompose it, even when given freedom to be able to represent the noise as a separate feature. To cope with this issue, we present an algorithm for NMF with a generalized least squares objective function (glsNMF) and derive multiplicative updates for the method together with proving their convergence. The new algorithm successfully recovers the true representation from the noisy data. Robust performance can make glsNMF a valuable tool for analyzing empirical data.

关键词： Working environment noise Least squares methods White noise Principal component analysis computer networks Data engineering Matrix decomposition Dictionaries Convergence Noise robustness

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O2-04-07: Functional connectivity changes during visual processing associated with grey matter atrophy in Alzheimer's disease

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Alzheimer's & Dementia 2010年第4S_PART_4期6卷

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Turn-on Time Delay of Uncooled Semiconductor Laser Diode Subject to External Optical Feedback: Theoretical Analysis

Turn-on Time Delay of Uncooled Semiconductor Laser Diode Sub...

引用

International Conference on computer Technology and Development (ICCTD)

作者： Mohammad Syuhaimi Ab-Rahman Mazen R. Hassan Computer & Network Security Research Group Faculty of Engineering & Built Environment Department of Electrical Electronic and Systems Engineering University Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

In this paper, the effect of external optical feedback (EOF) on the turn-on time delay (t on ) of uncooled semiconductor laser diode (SLD) is investigated theoretically. The effects temperature of operation (T) and EOF on t on are calculated according to their effect on threshold carrier density (N th ). The temperature dependence (TD) of N th is calculated according to the TD of laser cavity parameters and not by the well-known Parkove relationship. Simulation results show that t on increases as T increases due to increasing of N th . In addition, t on decreases as external reflectivity (r ext ) increases when the phase of reflected light is coherent. While at incoherent reflected light, t on increases sharply around specified value of r ext where this leads to inoperable case for SLD.

关键词： Delay effects Diode lasers Optical feedback Superluminescent diodes Temperature Laser feedback Charge carrier density Laser theory Reflectivity Optical fiber networks

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Development of Smart Drop Restoration Scheme for Customer's Ease in the i-FTTH EPON network Solution

Development of Smart Drop Restoration Scheme for Customer's ...

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International Conference on computer Technology and Development (ICCTD)

作者： Siti Rahayu Hassan Mohd Syuhaim Ab-Rahman Kasmiran Jumari Computer & Network Security Research Group Faculty of Engineering & Built Environment Department of Electrical Electronic and Systems Engineering Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper addresses a new restoration mechanism in drop region of EPON network by using the optical switch device to increase the efficiency, survivability and reliability of fiber to the home (FTTH) customer access network. The developed device will be installed at the drop section to detect the failure line that occurs in the multi-line drop section of FTTH network downwardly from passive optical splitter to the customer premises (ONU). The drop section restoration mechanism called smart drop restoration scheme (SDRS) will contribute for tree based and bus based architecture. Conventionally, the failure line of FTTH network can be measured using Optical Time-Domain Reflectometer (OTDR) upwardly from customer premises to the central office. The optical switches will be controlled by Access Control System (ACS). If the breakdown is the detected in drop section, ACS will recognize the related access line by the 3% tapped signal that is connected to every access line. The activation signal is then sent to activate the dedicated protection scheme. But if fault is still not restored, the shared protection scheme will be activated. Results from Optisystem software simulation will be presented so as to prove the solution feasibility.

关键词： EPON Optical fiber networks Optical fiber subscriber loops Optical switches Passive optical networks Protection Telecommunication network reliability Optical fiber devices Optical devices Optical network units

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Lock-on range of infrared heat seeker missile

Lock-on range of infrared heat seeker missile

引用

International Conference on Electrical engineering and Informatics, ICEEI

作者： Mohammed Syuhaimi Ab-Rahman Mazen R. Hassan Computer & Network Security Research Group Faculty of Engineering & Built Environment Department of Electrical Electronic and Systems Engineering University Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

The lock-on range, R, of infrared (IR) heat seeker missile has been studied in details. An analytical expression form of R has been derived in term of target (assumed as aircraft hot metal tailpipe), atmosphere and infrared (IR) detector parameters. The R is represented in term of ldquoLambert W functionrdquo and as a function of target temperature, T, and atmosphere extinction coefficient, alpha. Assuming clear sky background, the simulation results show: firstly, R increases as the target temperature increases. High value of R is achieved when the temperature of aircraft engine is high especially in takeoff case where the engine thrust is large. Secondly, R can be decreased by (1) increasing the attenuation coefficient of the propagation medium, i. e. by cooling the aircraft hot engine or any other obscurants that absorb or scatter the IR radiation (2) or by decreasing emissivity , epsiv, of the target surface which depends on the applied coatings / paintings. The decreasing of R will increase the probability of aircraft survivability assuming effective aircraft early warning system where the detecting range of the latter should be larger than the missile lock-on range.

关键词： Infrared heating Missiles Aircraft propulsion Temperature Atmosphere Infrared detectors Engines Extinction coefficients Atmospheric modeling Attenuation

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Temperature-pattern dependence of initial carrier density of high-speed digitally modulated uncooled semiconductor laser diodes: Theoretical analysis

Temperature-pattern dependence of initial carrier density of...

引用

International Conference on Electrical engineering and Informatics, ICEEI

In this paper, the temperature-pattern dependence (T-PD) of initial/residual carrier density, Ni, of high-speed digitally modulated uncooled semiconductor laser diode has been investigated in details. The temperature dependence (TD) of N ii has been calculated according to the TD of threshold carrier density, N th , analytically and not by the well known exponential Pankove. While the pattern dependence (PD) of N i has been calculated according to the effect of the number of ldquo0rdquo bits preceding the considered ldquo1rdquo bit, N bit , and bitrate, Brate, on the carrier density through the time interval between the ldquo1rdquo bits. We show, for the first time, that Ni may increase or decrease, i. e. fluctuate, with temperature of operation, T, depending on the time interval between the previous and the next ldquo1rdquo bits.

关键词： Charge carrier density Digital modulation Diode lasers Optical receivers Optical transmitters Optical modulation Passive optical networks Optical feedback Circuits Superluminescent diodes

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Implementation of Access Control System for Fiber to the Home

Implementation of Access Control System for Fiber to the Hom...

引用

International Conference on computer and Automation engineering, ICCAE

作者： Mohammad Syuhaimi Ab-Rahman Aswir Premadi Computer and Network Security Research Group Department of Electrical Electronics & Systems Engineering Faculty of Engineering and Built Environment Universiti Kebangsaan Malaysia Bangi Selangor Darul Ehsan Malaysia

This paper proposes a design and architecture of access control system to implement remote monitor and control for fiber to the home. Our solution works on a standard local area network (LAN) using a specially designed hardware interfaced with an Ethernet system rising PIC microcontroller. The developed design will be installed with optical line terminal (OLT) at the central office (CO). Protection switching is achieved automatically when failure occurs without interrupting customer service.

关键词： Passive optical networks Optical network units High speed optical techniques Microcontrollers Ethernet networks Hardware Design engineering Local area networks Integrated optics Condition monitoring

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