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International Conference on Distributed Computing Systems

作者： Weifa Liang G. Havas Xiaojun Shen Department of Mathematics University of Queensland QLD Australia Centre for Discrete Mathematics and Computing Department of Computer Science and Electrical Engineering University of Queensland QLD Australia Computer Science Telecommunications Program University of Missouri Kansas City Kansas City USA

We address the problem of efficient circuit switching in wide area networks. The solution provided is based on finding optimal routes for lightpaths and semilightpaths. A lightpath is a fully optical transmission path, while a semilightpath is a transmission path constructed by chaining several lightpaths together, using wavelength conversion at their junctions. The problem thus is to find an optimal lightpath/semilightpath in the network in terms of the cost of wavelength conversion and the cost of using the wavelengths on links. We first present fast, efficient algorithms both for the general problem and for a natural restricted version. The new algorithms outperform earlier work, providing time improvements amounting to an almost linear time factor in most cases. Also, all our algorithms can be implemented on the network in a distributed way.

关键词： Wavelength routing Intelligent networks WDM networks Optical wavelength conversion Biomedical optical imaging Optical fiber networks Costs High speed optical techniques Bandwidth Mathematics

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A model of the contention resolution time for binary tree protocols 92

A model of the contention resolution time for binary tree pr...

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Proceedings of the 1992 ACM annual conference on Communications

作者： Jagan P. Agrawal Mary L. Gerken Computer Science Telecommunications Program University of Missouri-Kansas City Kansas City MO Environment Protection Agency 726 Minnesota Ave. Kansas City KS

ISBN: (纸本)9780897914727

In a binary tree type local area network (LAN) protocol, the number of probe slots (K) needed for contention resolution, when M out of N terminals are contending for the bus access depends not only on the value of M but also on the pattern of the active terminals, i.e., where the physical addresses of the active terminals are located in the logical binary tree structure. The value of M depends on the traffic intensity and increases with the packet arrival *** this paper, we develop simple mathematical models for the upper and lower bounds on K as a function of M, with N as a parameter taking into account the above active terminal patterns. The models developed are useful in determining the maximum and minimum transmission frame durations for the performance evaluation of binary type LAN protocols and other reservation type LAN protocols which employ binary tree type probing algorithm. In the case of integrated traffic, when frame duration is to be fixed, the model will enable to optimize bandwidth allocation to different types of traffic.

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Sensing as a Service: An Exploration into Practical Implementations of DSA

Sensing as a Service: An Exploration into Practical Implemen...

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IEEE International Symposium on New Frontiers in Dynamic Spectrum Access Networks, DySPAN

作者： Martin B. H. Weiss Simon Delaere William H. Lehr Telecommunications Program School of Information Sciences University of Pittsburgh Pittsburgh PA USA Vrije Universiteit Brussel Belgium Laboratory for Computer Science Massachusetts Institute of Technology USA

The cognitive radio literature generally assumes that the functions required for non-cooperative secondary DSA are integrated into a single radio system. It need not be so. In this paper, we model cognitive radio functions as a value chain and explore the implications of different forms of organization of this value chain. We initially explore the consequences of separating the sensing function from other cognitive radio functions.

关键词： Chromium Cognitive radio Commercialization Communications Society Power generation economics Economic forecasting Costs TV Time division multiple access Frequency synchronization

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Robust traffic design for dynamic routing networks

Robust traffic design for dynamic routing networks

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： G.R. Ash F. Chang D. Medhi AT and T Bell Laboratories Inc. Holmdel NJ USA Institute of Information Science Academia Sinica Taipei Taiwan Computer Science Telecommunications Program University of Missouri Kansas City MO USA

The authors present traffic restoration design algorithms to attain a robust network for any facility link or node failure. Some of these algorithms were implemented on network models to compute the cost for doing traffic restoration for different traffic restoration level objectives. From their simulation studies, the authors found that with efficient use of trunk group diversity and at a reasonable incremental cost, one can obtain a robust network to respond to a major facility link or a node failure and still meet the network objectives. A similar approach based on the algorithms presented in this work has been proposed for design of the worldwide intelligent network.< >

关键词： Robustness Telecommunication traffic Routing Traffic control Algorithm design and analysis Ash Circuits Cities and towns Discrete event simulation Degradation

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A proposal for an integrated utilities Engineering-Management M.S. program

A proposal for an integrated utilities Engineering-Managemen...

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2004 37th Annual Frontiers of Power Conference

作者： Barnes, Frank S. Fuchs, Ewald F. Tietjen, Jill S. Silverstein, Joann Ko, Hon-Yim Lookabaugh, Tom Brown, Timothy X. Sicker, Douglas C. University of Colorado AAAS IEEE International Engineering Consortium National Academy of Engineering Department of Electrical Engineering LLC McNeil Technologies Board for Girl Scouts Mile Hi Council Georgia Transmission Corporation of Tucker GA ABET Inc. National Council of Examiners for Engineering and Surveying SWE IEEE Power Engineering Society Department of Civil Environmental and Architectural Engineering UCB National Water Research Institute Women in Engineering Program Center of the American West College of Engineering Department of Civil Environmental and Archetectural Engineering University of Colorado Jet Propulsion Laboratory Computer Science Department Interdisciplinary Telecommunications Program University of Colorado Boulder University of Colorado Boulder Electrical Engineering and Interdisciplinary Telecommunications University of Colorado Boulder Department of Computer Science University of Colorado Boulder ITP Laboratory ACM Internet Society Faculty of the Progress and Freedom Foundation Institute for Regulatory Law and Economics Aspen Institute Communications and Society Program CU Computer and Communications Security Center Center for Science and Technology Policy Research Research and Engineering Center for Unmanned Vehicles Electrical and Computer Engineering Civil Environmental and Architectural Engineering

Electric, water, gas and transportation utilities face severe challenges associated with security, quality, availability, reliability and profitability issues. They must solve interrelated system problems with respect to generation of electricity, transportation of fuel, and potable as well as waste water. In the future, engineers and managers of utilities must be well versed in the different disciplines of engineering including electrical civil, mechanical and information technology. The University of Colorado at Boulder addresses this educational opportunity by proposing a novel Integrated Utilities Management program for M.S. candidates who have a solid B.S. background or equivalent in a related discipline. The M.S. program will consist of four interdisciplinary paths dealing with business management and legal topics as they relate to federal and state regulatory issues, as well as agency and people-related leadership issues. The electric utilities option of this program will be centered on three core courses related to electric power generation/transmission and distribution, security and availability, quality and reliability, economics and environmental policy, and utility finance;two elective courses from a group of courses that address nuclear power, waste water, solid waste, telecommunications, renewable energies, data communication, fuels and case studies;and one capstone course consisting of either operations research or the investigation and resolution of a pending utility project such as the right-of-way of transmission lines, specification of new power plants, retrofitting of power plants or their impact on the environment. It is expected that candidates for this MS program will come from universities, from utilities, and from private and public agencies. The MS program can be completed by full- or part time students within one or two years of intensive study, respectively. Courses will be taught both on campus and nationwide via the Center for Advanced

关键词： Public utilities

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V-NET: a framework for a versatile network architecture to support real-time communication performance guarantees

V-NET: a framework for a versatile network architecture to s...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： B. Field T.F. Znati D. Mosse Department of Computer Science University of Pittsburgh Pittsburgh PA USA U S WEST Technologies Boulder CO USA Telecommunications Program University of Pittsburgh Pittsburgh PA USA

The paper proposes a new network architecture, called the versatile network architecture (V-NET), which provides a framework for flexible support of communication requirements in real-time networks. Applications communicate over the V-NET by using simplex end-to-end network connections which support specific real-time and reliability characteristics tailored to meet the application's specified requirements. V-NET differs from other proposed architectures in that it does not assume one specific packet scheduling algorithm or a specific traffic policing mechanism. Instead, the V-NET has been designed to support a variety of packet scheduling algorithms and traffic policing mechanisms. This flexibility is an important design consideration as a real-time network architecture must accommodate existing and future multimedia applications.

关键词： Scheduling algorithm computer architecture Delay effects Bandwidth Contracts Packet switching Monitoring computer science Drives Telecommunication network reliability

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Wave algorithm for recruitment in swarm robotics

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2015年 9156卷 3-13页

作者： Silva, Luneque Nedjah, Nadia Systems Engineering and Computer Science Program Federal University of Rio de Janeiro Rio de Janeiro Brazil Department of Electronics Engineering and Telecommunications State University of Rio de Janeiro Rio de Janeiro Brazil

In the last decades, studies on swarm robotics have grown significantly, with different new aspects becoming of interest in research. Although the primary interest in swarm robotics should be the application, which is the task that robots should perform, other aspects are also studied. For instance, in a robotic swarm, it may be necessary to select the robots that would perform a given task, aiming at a division of labor among the members. A similar problem is that of robot recruitment, required when a specific robot needs assistance to execute some tasks and thus needs to recruit other robots of the swarm to do so. In this paper, a distributed algorithm, termed the wave algorithm, is exploited to perform the recruitment based mainly on robot message passing to neighboring robots. © Springer International Publishing Switzerland 2015.

关键词： Message passing

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A parallel architecture for Ray-Tracing

A parallel architecture for Ray-Tracing

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IEEE Latin American Symposium on Circuits and Systems (LASCAS)

作者： Alexandre S. Nery Nadia Nedjah Felipe M.G. França LAM - Computer Architecture and Microeletronics Laboratory Systems Engineering and Computer Science Program COPPE Universidade Federal do Rio de Janeiro Department of Electronics Engineering and Telecommunications Universidade do Estado do Rio de Janeiro

Real time rendering of three-dimensional scenes in high photorealistic detail is a hard task, such as in the Ray Tracing rendering algorithm. However, parallel implementations of Ray Tracing have been enabling real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an acceptable performance. In this paper, we propose a hardware parallel architecture capable of dealing with the main desirable features of Ray Tracing, such as shadows and reflection effects, imposing low area cost and acceptable rendering performance.

关键词： computer architecture Interrupters computers Light sources Process control Real-time systems telecommunications

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Multi-photon implementation of three-stage quantum cryptography protocol

Multi-photon implementation of three-stage quantum cryptogra...

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International Conference on Information Networking

作者： Sayonnha Mandal Gregory Macdonald Mayssaa El Rifai Nikhil Punekar Farnaz Zamani Yuhua Chen Subhash Kak Pramode K. Verma Robert C. Huck James Sluss Telecommunications Engineering Program University of Oklahoma-Tulsa Tulsa OK USA Dept. of Electrical and Computer Engineering University of Houston Houston TX USA Department of Computer Science Oklahoma State University Stillwater OK USA

The paper presents the implementation of a quantum cryptography protocol for secure communication. As computing power increases, classical cryptography and key management schemes based on computational complexity become increasingly susceptible to brute force and cryptanalytic attacks. Current implementations of quantum cryptography are based on the BB84 protocol, which is susceptible to siphoning attacks on the multiple photons emitted by practical laser sources. The three-stage protocol, whose implementation is described in this paper, is a departure from conventional practice and it obviates some of the known vulnerabilities of the current implementations of quantum cryptography. This paper presents an implementation of the three-stage quantum communication protocol in free-space. To the best of the authors' knowledge, this is the first implementation of a quantum protocol where multiple photons can be used for secure communication.

关键词： Protocols Cryptography Laser beams Photonics Optical retarders Mirrors Encoding

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Multi-Photon Tolerant Secure Quantum Communication - From Theory to Practice

Multi-Photon Tolerant Secure Quantum Communication - From Th...

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IEEE International Conference on Communications

作者： Yuhua Chen Subhash Kak Pramode K. Verma Gregory Macdonald Mayssaa El Rifai Nikhil Punekar Dept. of Electrical and Computer Engineering University of Houston Houston TX USA Department of Computer Science Oklahoma State University Stillwater OK USA Telecommunications Engineering Program University of Oklahoma-Tulsa Tulsa OK USA

Contemporary implementations of Quantum Key Distribution are based on BB84, first proposed in 1984, and commercially implemented for limited market applications in the early 2000 s. A major limitation of BB84 is that it requires no more than a single photon per time slot. But no device can reliably generate single photons with guaranteed periodicity. In this paper, we address the practical issues of realizing quantum cryptography systems. In particular, we address the major shortcomings of quantum cryptography as practiced today - the limitation of requiring a single photon to be used in communication. This not only affects the security of the practical quantum cryptography systems, but also restricts the distance over which secure keys can be sent and their rate. Our approach is not limited to a single photon per time-slot thus making it possible to send keys faster and over longer distances. The paper discusses the innate nature of multi-photon communication protocols as a surrogate for quantum communication while giving it a cryptographic strength that would closely match that of a pure quantum communication system.

关键词： Photonics Protocols Cryptography Laser beams Quantum mechanics

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