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International Workshop on Reliable Networks Design and Modeling (RNDM)

作者： Jaime Silva Teresa Gomes David Tipper Lúcia Martins Velin Kounev Department of Physics CFC University of Coimbra Coimbra Portugal INESC Coimbra Coimbra Portugal Department of Electrical and Computer Engineering University of Coimbra Coimbra Portugal Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA

The exact calculation of all-terminal reliability is not feasible in large networks. Hence estimation techniques and lower and upper bounds for all-terminal reliability have been utilized. We propose using an ordered subset of the mincuts and an ordered subset of minpaths to calculate an all-terminal reliability upper and lower bound, respectively. The advantage of the proposed approach results from the fact that it does not require the enumeration of all mincuts or all minpaths as required by other bounds. The performance of the algorithm is compared with the first two Bonferroni bounds, for networks where all mincuts could be calculated. The results show that the proposed approach is computationally feasible and reasonably accurate. Thus allowing one to obtain bounds when it not possible to enumerate all mincuts or all minpaths.

关键词： Availability Probability Telecommunication network reliability Upper bound Computer network reliability Reliability engineering

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Evaluating geographic topological vulnerabilities

Evaluating geographic topological vulnerabilities

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International Conference on Ultra Modern telecommunications and Workshops (ICUMT)

作者： Xuelian Long David Tipper Teresa Gomes Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA Department of Electrical and Computer Engineering University of Coimbra / INESC Coimbra Coimbra Portugal

Measuring the survivability of core backbone communication networks to geographic correlated failures is important in network analysis and design. Different measures of network survivability have been used in the literature, for example, Algebraic Connectivity, Network Criticality, Average Shortest Path, Network Diameter, Node Degree and Node Strength. This paper proposes a new performance measure Weighted Spectrum to evaluate network survivability regarding geographic correlated failures. Further we conduct a comparative analysis by finding the most vulnerable geographic cuts or nodes in the network though solving an optimization problem to determine the cut with the largest impact for each measure. Numerical results on several sample network topologies show that the worst-case geographic cuts depend on the measure used in an unweighted graph. The proposed Weighted Spectrum measure is shown to be more versatile than other measures in unweighted and weighted graphs.

关键词： Network topology Topology Weight measurement Laplace equations Conferences Reliability engineering

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Characterization of the radiation pattern of antennas using time-domain spherical-multipole and moment expansion

Characterization of the radiation pattern of antennas using ...

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作者： Ramos, Glaucio L. Rego, Cássio G. Fonseca, Alexandre R. Federal University of São João Del-Rei Department of Telecommunications and Mechatronics Engineering Ouro Branco MG Brazil Graduate Program in Electrical Engineering Federal University of Minas Gerais Brazil Federal University of Minas Gerais Department of Electronic Engineering Belo Horizonte MG Brazil Federal University of Vales Do Jequitinhonha e Mucuri Department of Computing Diamantina MG Brazil

This paper presents results of a time-domain spherical-multipole near-to-far-field transformation together with a moment expansion applied to antenna radiation patterns. The equivalence principle is applied to the tangential fields all over the FDTD/WP-PML spatial grid and the use of the spherical-multipole expansion leads to the near-to-far-field transformation, and energy and power norms of temporal signals are used to obtain the antenna radiation patterns for transient and steady-state responses. Such approach is employed to obtain UWB antenna radiated fields and radiation patterns directly in time-domain, it being more convenient to perform an unified characterization in time and frequency domains. © 2013 SBMO/SBMag.

关键词： Directional patterns (antenna)

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An evolutionary model of service innovation in 4G mobile technology

An evolutionary model of service innovation in 4G mobile tec...

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2012 International Conference on Innovation, Management and Technology Research, ICIMTR 2012

作者： Suryanegara, Muhammad Graduate Program of Management of Telecommunications Department of Electrical Engineering Universitas Indonesia Jakarta Indonesia

ISBN: (纸本)9781467306553

This paper aims to develop a model of evolutionary mechanism of service innovation in regards to the coming of 4G mobile technology. It is developed by approaching the evolutionary theory signifying the process of learning, adaptation and selection between cellular operators and the market. In our model, the Quality of Service mediates such evolutionary features, in which the operators will conduct learning process from the market as their environment. The fitness of the system will be achieved through a certain mechanism of selection and survival. Consequently, the success of service innovation strategy would be determined by certain parameters including quality, customer care, service coverage and tariff. Based on such model, the explanatory concept of 4G technological management is proposed. © 2012 IEEE.

关键词： Commerce

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An evolutionary model of service innovation in 4G mobile technology

An evolutionary model of service innovation in 4G mobile tec...

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International Conference on Innovation Management and Technology Research (ICIMTR)

作者： Muhammad Suryanegara Graduate Program of Management of Telecommunications Department of Electrical Engineering Universitas Indonesia Jakarta Indonesia

关键词： Technological innovation Mobile communication Quality of service Economics telecommunications Adaptation models Couplings

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A FDTD-based propagator with a material independent PML formulation

A FDTD-based propagator with a material independent PML form...

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Cláudio Garcia Batista Cássio Gonçalves do Rego Luiz A. R. da Silva Mello Graduate Program in Electrical Engineering Department of Electronic Engineering Federal University of Minas Gerais Belo Horizonte MG Brazil Center of Studies in Telecommunications Catholic University of Rio de Janeiro Rio de Janeiro RJ Brazil

This work presents a finite-difference time-domain (FDTD) propagator comprising a moving window algorithm and a material independent (MI) perfectly matched layer (PML) formulation. The FDTD provides a full-wave electromagnetic calculation and a large frequency range application. The FDTD mesh is constructed only in the virtual window, saving memory and computation effort. The MI-PML formulation can be efficiently applied to any real propagation scenario without any modification. The method is applied to two idealized terrain profiles involving HF and VHF signals. The exhibited results are preliminary and the FDTD-propagator is still under development.

关键词： Time domain analysis Finite difference methods Mathematical model Computational modeling Moment methods Equations Materials

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A FDTD-based propagator with a material independent PML formulation

A FDTD-based propagator with a material independent PML form...

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2011 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference, IMOC 2011

作者： Batista, Cláudio Garcia Do Rego, Cássio Gonçalves Da Silva Mello, Luiz A. R. Graduate Program in Electrical Engineering Federal University of Minas Gerais Av. Antônio Carlos 6627 31270-901 Belo Horizonte-MG Brazil Department of Electronic Engineering Federal University of Minas Gerais 31270-901 Belo Horizonte-MG Brazil Center of Studies in Telecommunications Catholic University of Rio de Janeiro Rua Marquês de São Vicente 225 22453-900 Rio de Janeiro-RJ Brazil

ISBN: (纸本)9781457716621

关键词： Finite difference time domain method

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Clonal Selection Algorithm with Oppositional Approach Applied to Trajectory Planning of a Robotic Manipulator

Clonal Selection Algorithm with Oppositional Approach Applie...

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Brazilian Symposium on Neural Networks

作者： Daniel C. Jeronymo Yuri C. C. Borges Leandro dos S. Coelho Department of Electrical Engineering Federal University of Paraná (UFPR) Curitiba Brazil Telecommunications and Control Department Polytechnique School University of São Paulo Sao Paulo Brazil Industrial and Systems Engineering Graduate Program Pontifical Catholic University of Paraná Curitiba Parana Brazil

A complex optimization problem in robotics is the optimum movement between certain physical configurations while minimizing certain criteria. The fundamental objective in movement planning for robot arms is to minimize movement time, total distance, joint torque, avoiding obstacles and the robot arm itself as an obstacle. This paper presents a study on clonal selection algorithm (CSA) and CSA with oppositional approach to optimize the 2D point to point movement of a 3-links robot arm. Simulations with MATLAB of the problem were implemented with both techniques to minimize an objective function depending on the mentioned criteria. Results of both methods are presented, showing that the CSA with oppositional approach presented better results than the classical CSA in terms of convergence and response quality.

关键词： Manipulators Joints Planning Torque Trajectory Optimization

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Journal of Information Science and engineering: Editorial notice

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Journal of Information Science and engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

No abstract available

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BOOK REVIEW: Bioimpedance and Bioelectricity Basics, by Sverre Grimnes and Orjan G. Martinsen

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Annals of Biomedical engineering 2002年第2期30卷 282-282页

作者： Vieira, Luis Carlos Programa de Pós-Graduação em Engenharia Elétrica e Informática Industrial Departamento de Eletrônica e Telecomunicações (Graduate Program in Electrical Engineering and Industrial Computer Science Department of Electronics and Telecommunications) Centro Federal de Educação Tecnológica do Paraná (Federal Center of Technological Education of Paraná) Curitiba Brazil

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