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Performance analysis of CPCH-type packet channels for variable-bit-rate applications

Performance analysis of CPCH-type packet channels for variab...

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IEEE Conference on Vehicular Technology (VTC)

作者： Lei Zhou Yu-Dong Yao H. Heffes Wireless Systems Engineering Laboratory (WISELAB) Department of Electrical & Computer Engineering Stevens Institute of Technology Hoboken NJ USA

This work gives an analytical performance measure of the common packet channel (CPCH) in 3rd Generation Partnership Project (3GPP) wideband code division multiple access (W-CDMA) systems. The CPCH procedure of the channel assignment (CA) mode is modeled as an Erlang loss network, and a technique for analyzing Erlang loss networks is applied to get the expression of the system throughput and delay. The theoretical results are verified with computer simulations.

关键词： Performance analysis Niobium Multiaccess communication Application software Wideband Access protocols Traffic control systems engineering and theory Modeling Mobile communication

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Performance analysis of NAK-based ARQ in correlated-error channels

Performance analysis of NAK-based ARQ in correlated-error ch...

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IEEE Conference on Vehicular Technology (VTC)

作者： MoonYoung Choi Yu-Dong Yao H. Heffes Wireless Systems Engineering Laboratory (WISELAB) Department of Electrical and Computer Engineering Stevens Institute of Technology Hoboken NJ USA

This paper studies the performance of negative acknowledgement- (NAK-) based ARQ which is a conventional selective repeat ARQ except sending an acknowledgment message only when a transmission error occurs. A Markovian error channel model is considered for both forward and feedback channels. The throughput and mean extra delay in terms of RTD (round trip delay) are obtained. The result shows that the throughput of NAK-based ARQ in a noisy feedback environment is as good as that of a selective repeat ARQ scheme with a perfect feedback channel.

关键词： Performance analysis Automatic repeat request Feedback Delay computer errors Throughput systems engineering and theory Laboratories Working environment noise Data communication

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A 1-V, 10-bit rail-to-rail successive approximation analog-to-digital converter in standard 0.18 μm CMOS technology

A 1-V, 10-bit rail-to-rail successive approximation analog-t...

引用

2001 IEEE International Symposium on Circuits and systems, ISCAS 2001

作者： Fayomi, Christian Jesus B. Roberts, Gordon W. Sawan, Molianiad Ecole Polytechnique de Montreal Department of Electrical and Computer Engineering Station Centre Ville P.0 Box 6079 Montreal H3C 3A7 Canada Microelectronics and Computer Systems Laboratory McGill University Montreal H3A 2A7 Canada

ISBN: (纸本)0780366859

Two architectures for a 1-V, 10-bit 200-kS/s successive approximation analog-to-digital converter (ADC) implemented in a standard CMOS 0.18 μm digital process are presented. A track-and-hold circuit based on a novel implementation of the bootstrapped low-voltage analog CMOS switch with a novel rail-to-rail track-and-latch comparator circuit is described. A pMOS-only ladder containing a rail-to-rail current-to-voltage converter, performs the DAC function in the second ADC topology whereas a conventional R-2R ladder is used in the first one. Successive approximation and control logic is implemented using of robust single clock phase D flip flop. © 2001 IEEE.

关键词： Ladders

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A 1-V, 10-bit rail-to-rail successive approximation analog-to-digital converter in standard 0.18 /spl mu/m CMOS technology

A 1-V, 10-bit rail-to-rail successive approximation analog-t...

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： C.J.B. Fayomi G.W. Roberts M. Sawan Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Montreal Canada Microelectronics and Computer Systems Laboratory McGill University Montreal Canada

ISBN: (纸本)0780366859

Two architectures for a 1-V, 10-bit 200-kS/s successive approximation analog-to-digital converter (ADC) implemented in a standard CMOS 0.18 /spl mu/m digital process are presented. A track-and-hold circuit based on a novel implementation of the bootstrapped low-voltage analog CMOS switch with a novel rail-to-rail track-and-latch comparator circuit is described. A pMOS-only ladder containing a rail-to-rail current-to-voltage converter, performs the DAC function in the second ADC topology whereas a conventional R-2R ladder is used in the first one. Successive approximation and control logic is implemented using of robust single clock phase D flip flop.

关键词： Analog-digital conversion CMOS technology Circuits Power supplies CMOS process Threshold voltage Dynamic range Wide area networks Microelectronics Laboratories

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Differentially secure multicasting and its implementation methods

Differentially secure multicasting and its implementation me...

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International Conference on computer Communications and Networks (ICCCN)

作者： S. Holeman G. Manimaran J. Davis Dependable Computing & Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA Information Systems Security Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

Though the areas of secure multicast group architecture, key distribution and sender authentication are under scrutiny, one topic that has not been explored is how to integrate these with multilevel security. Multilevel security is the ability to distinguish subjects according to classification levels, which determines to what degree they can access confidential objects. In the case of groups, this means that some members can exchange messages at a higher sensitivity level than others. The Bell-La Padula model outlines the rules of these multilevel accesses (see Bell, D. and La Padula, L., MITRE Report, M74-244, MTR 2547 v2, 1973). In multicast groups that employ multilevel security, some of these rules are not desirable, so a modified set of rules is developed and is termed differential security. Also, this paper proposes three methods to set up a differentially secure multicast group: (1) naive approach, (2) multiple tree differential security (DiffSec) approach, and (3) single DiffSec tree approach. Our simulation studies show that both single and multiple DiffSec tree approaches offer similar performance in terms of bandwidth consumption, which is significantly better than that of the naive approach. We also discuss the suitability of the schemes, taking into account scalability and implementation issues.

关键词： Multilevel systems Security Cryptography computer networks Distributed computing Laboratories Bandwidth Scalability Multicast communication Information systems

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Smart MEMS: micro-structures with error-suppression and self-calibration control capabilities

Smart MEMS: micro-structures with error-suppression and self...

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American Control Conference (ACC)

作者： A.M. Shkel Micro Systems Laboratory Department of Mechanical and AeroSpace Engineering Department of Electrical and Computer Engineering University of California Irvine Irvine CA USA

Micro-sensors and actuators are differentiated from conventional sensors and actuators by their size, cost, and techniques used in their manufacture. The small size of MEMS is a convenience, a contribution to their potentially low cost, and a source of new conceptual challenges. Improvements in sensing structures, process technology, and circuit technology are presently addressed by the MEMS research community. Unavoidable, the next logical step in-the MEMS evolution will be development of precision micro-systems by integrating a number of smart control functions including self-calibration, self-testing, structural compensation, and even communication with one or more other sensors located on the same chip. The control community will be the critical driving force in these developments. This paper gives an overview of functional blocks needed for Smart MEMS and provides several examples highlighting benefits of the paradigm.

关键词： Micromechanical devices Actuators Intelligent sensors Costs Communication system control Manufacturing Circuits Built-in self-test Force control Force sensors

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Design and implementation of Automatic parallel Detection Layer

Design and implementation of Automatic Parallel Detection La...

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IEEE International Conference on systems, Man and Cybernetics

作者： M. Ahamed H. Eldeeb S. Nassar N. Bagherzadeh Computer Science Mathematics Department Faculty of Science Cairo University Cairo Egypt Electrical and Computer Engineering University of California Irvine Irvine CA USA Computer & Control Department Electronic Research Institute Head of Parallel and Distributed Systems team Cairo Egypt Chair of Electrical and Computer Engineering University of California Irvine Irvine CA USA

We develop a new software layer called the Automatic parallel Detection Layer (APDL) for the automatic transformation from sequential to parallel code. The main interest, in this research, is the parallelism at loop level, because significant parallelism in programs almost invariably occurs in loops. The proposed APDL has five processes for code transformation: the sequential source code parser, data dependence analysis of this code, partitioning, scheduling both task and data, and generating parallel source code. Many cases have been studied to evaluate the performance of the developed layer. The performance is evaluated depending on the execution time of: the sequential code, the parallel programmer code, and the code output from APDL for the same case study. Performance results show that APDL greatly improves the execution time with respect to sequential execution time, and saves on the high cost of a parallel programmer.

关键词： parallel processing Concurrent computing Programming profession Electronic mail Program processors Distributed computing High performance computing computer science Automatic control parallel programming

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Discovery of parallel scheduling algorithms in cellular automata - based systems 15

Discovery of parallel scheduling algorithms in cellular auto...

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15th International parallel and Distributed Processing Symposium, IPDPS 2001

作者： Seredyński, F. Świȩcicka, A. Zomaya, A.Y. Polish -Japanese Institute of Information Technologies Koszykowa 86 Warsaw02-008 Poland Institute of Computer Science Polish Academy of Sciences Ordona 21 Warsaw01-237 Poland Department of Computer Science Bialystok University of Technology Wiejska 45A Bialystok15-351 Poland Parallel Computing Research Laboratory Department of Electrical and Electronic Engineering University of Western Australia Nedlands PerthWA6907 Australia

ISBN: (纸本)0769509908

In this paper we report new results concerning developing parallel multiprocessor scheduling algorithms working in cellular automata (CAs) - based scheduler. We consider the simplest case when a multiprocessor system is limited to two processors, but we not imply any limitations on a size and parameters of parallel programs. We use an approach called a selected neighborhood to design a nonlinear structure of CAs for a given program graph. We propose to use coevolutionary genetic algorithm (GA) to discover rules of parallel CAs, suitable for solving the scheduling problem. We compare sequential and parallel scheduling algorithms discovered in the context of CAs - based scheduling system. © 2001 IEEE.

关键词： Cellular automata

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Adaptive critic-based neural network object contact controller for a three-finger gripper

Adaptive critic-based neural network object contact controll...

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IEEE International Symposium on Intelligent Control (ISIC)

作者： G. Galan S. Jagannathan Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Texas San Antonio San Antonio TX USA

MAR'S greenhouse operation requires robot arms that are capable of manipulating objects such as plant trays, fruits, vegetables and so on. Grasping and manipulation of objects have been a challenging task for robots. It is important that the manipulator performs these tasks accurately and faster with out damaging the object. The complex grasping task can be defined as object contact control and manipulation subtasks. In this paper, object contact subtask is defined in terms of following a trajectory accurately so that the object to be grasped is in contact with the gripper. The proposed controller scheme consists of a feedforward action generating neural network (NN) that compensates for the nonlinear gripper and object contact dynamics. The learning of this NN is performed online based on a critic signal so that a 3-finger gripper tracks a predefined desired trajectory, which is specified in terms of a desired position and velocity for object contact control. Novel weight tuning updates are derived for the action generating NN and a Lyapunov-based stability analysis is presented. Simulation results are shown for a 3-finger gripper making contact with an object.

关键词： Adaptive systems Programmable control Adaptive control Neural networks Grippers Robots Manipulators Feedforward neural networks Trajectory Velocity control

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The neural network model of music cognition ARTIST and applications to the WWW

The neural network model of music cognition ARTIST and appli...

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International Conference on Web Delivering of Music (WEDELMUSIC)

作者： P. Frederic Image Video and Multimedia Systems Laboratory Department of Electrical and Computer Engineering National and Technical University of Athens Zografou Greece

ISBN: (纸本)0769512844

We present a simple ART2 neural network (NN) model, ARTIST, and show how after simple exposure to music and unsupervised learning, it is able to simulate high level perceptual and human cognitive abilities. Amongst other things, it is able to predict with a very high degree of accuracy how good a short musical sequence will sound to human ears. For this, ARTIST has to be exposed to the same kind of music as the listeners'. Such a model able to recover the rules of music aesthetics according to a particular musical environment, totally under control of the user, can have many applications to the distribution of music through the World Wide Web. The most straightforward application is to build an accurate profile of the user's musical preferences, based on the musical content itself. This should avoid the usual drawbacks of the current search engines and other "musical advisors", which base their advice on rigid musical style classifications, and are too general and impersonal. Other applications can range from assisted composition to interactive man-machine duet improvisation or the creation of online alternative versions of songs (remix).

关键词： Neural networks Multiple signal classification Cognition World Wide Web Application software Humans Web sites Genetic mutations Databases Multimedia systems

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