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Two-time-scale distributions and singular perturbations

Two-time-scale distributions and singular perturbations

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IEEE Conference on Decision and Control

作者： H.M. Oloomi G.R. Sarhangi M. Najafi Department of Engineering Purdue University Fort Wayne Wayne IN USA Department of Math. Science Southwestern College Winfield KS USA Math Computer Department Emporia State University Emporia KS USA

Two-time scale (TTS) distributions are introduced. For a class of stable systems, it is shown that every TTS distribution has a two-frequency-scale (TFS) Laplace transform. Conversely, it is shown that the impulse response of any stable TFS transfer function, and hence any stable (standard) singularly perturbed system, can be characterized in terms of a stable TTS distribution. A time domain decomposition for TTS distributions is obtained which parallels the slow and fast decompositions of singularly perturbed systems and also the frequency domain decompositions of TFS transfer functions. It is shown that every stable TTS distribution can be decomposed in terms of two simpler distributions represented in two different time scales. A composite distribution is constructed from these two which approximates the TTS distribution arbitrarily closely in the L/sub 1/ norm.< >

关键词： Speech synthesis Transfer functions Frequency domain analysis Laplace equations State-space methods Educational institutions Hydrogen

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Chains of recurrences - a method to expedite the evaluation of closed-form functions 94

Chains of recurrences - a method to expedite the evaluation ...

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Proceedings of the 1994 International Symposium on Symbolic and Algebraic Computation

作者： Bachmann, Olaf Wang, Paul S. Zima, Eugene V. Dept. of Math. and Computer Science Kent State University Kent Ohio Distributed Computing Department Sandia National Laboratories P.O.Box 969 Mail Stop 9214 Livermore CA Dept. of Computational Mathematics and Cybernetics (BMK) Moscow State University Moscow 119899 Russia

Chains of Recurrences (CR's) are introduced as an effective method to evaluate functions at regular intervals. Algebraic properties of CR's are examined and an algorithm that constructs a CR for a given functi... 详细信息

ISBN: (纸本)9780897916387

关键词： Chains

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Foundations of timed concurrent constraint programming

Foundations of timed concurrent constraint programming

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Annual Symposium on Logic in computer science

作者： V.A. Saraswat R. Jagadeesan V. Gupta Systems and Practices Lab Xerox-PARC Palo Alto CA USA Department of Math. Sciences Loyola University Chicago IL USA Department of Computer Science University of Stanford Stanford CA USA

We develop a model for timed, reactive computation by extending the asynchronous, untimed concurrent constraint programming model in a simple and uniform way. In the spirit of process algebras, we develop some combinators expressible in this model, and reconcile their operational, logical and denotational character. We show how programs may be compiled into finite-state machines with loop-free computations at each state, thus guaranteeing bounded response time.< >

关键词： Automata Concurrent computing Algebra Control systems computer languages computer science Time factors Maintenance Equations Modular construction

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Adaptive fault-tolerant wormhole routing algorithms with low virtual channel requirements

Adaptive fault-tolerant wormhole routing algorithms with low...

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International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN)

作者： S. Chalasani R.V. Boppana Electrical & Comp. Engineering Department University of Wisconsin Madison Madison WI USA Division of Math. and Computer Science University of Texas San Antonio San Antonio TX USA

We present simple methods to enhance a recently proposed class of fully adaptive algorithms for fault tolerant wormhole routing. These algorithms are based on J. Duato's (1993) theory and are being used in several research projects. We show that with three virtual channels per physical channel, multiple rectangular shaped fault blocks can be tolerated in two dimensional meshes. There is no restriction on the number of faults, and maintaining fault information locally is sufficient. The logic for fault tolerant routing is used only in the presence of faults, and there is no performance degradation in the absence of faults. The proposed technique incorporates fault tolerance into wormhole algorithms with simple logic and low virtual channel requirements.< >

关键词： Fault tolerance Routing Logic System recovery Algorithm design and analysis Adaptive algorithm computer science Degradation computer networks Concurrent computing

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Fault-tolerant routing with non-adaptive wormhole algorithms in mesh networks 94

Fault-tolerant routing with non-adaptive wormhole algorithms...

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Supercomputing Conference

作者： R.V. Boppana S. Chalasani Div. of Math. and Computer Science University of Texas San Antonio San Antonio TX USA Electrical & Comp. Engr. Department University of Wisconsin Madison Madison WI USA

ISBN: (纸本)9780818666056

We present simple techniques to enhance the e-cube algorithm for fault-tolerant routing in mesh networks. These techniques are based on the concept of fault rings, which are formed using fault free nodes and links around each fault region. We use fault rings to enhance the e-cube to route messages in the presence of rectangular block faults. We show that if fault rings do not overlap with one another-the sets of links in fault rings are pairwise disjoint, then two virtual channels per physical channel are sufficient to make the e-cube tolerant to any number of faulty blocks. For more complex cases such as overlapping fault rings and faults on network boundaries, three or four virtual channels are used. In all cases, the routing guarantees livelock and deadlock free delivery of each and every message injected into the network. Our simulation results for isolated faults indicate that the proposed method provides acceptable performance with as many as 10 percent faulty links.< >

关键词： Fault tolerance Routing Intelligent networks Mesh networks System recovery computer science Communication switching Communication channels Algorithm design and analysis Telecommunication traffic

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Techniques for improving computer-assisted communication for physically impaired non-vocal people through using prestored extended texts

Techniques for improving computer-assisted communication for...

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IEEE International Conference on Systems, Man and Cybernetics

作者： N. Alm J.L. Arnott A.F. Newell Microcentre Department of Mathematics and Computer Science Dundee University Dundee UK University of Dundee Dundee Dundee GB Dept. of Math. & Comput. Sci. Dundee Univ. UK

The problems faced by people whose physical impairments include the inability to communicate through speech are demonstrated by the fact that, even with current technology, speech rates achievable using speech output devices typically vary between 2-10 words per minute. We have been investigating ways in which the communication system itself could take on many of the cognitive and manipulative tasks required to locate and produce suitable prestored texts for the user. The storage and retrieval methods we have investigated include a text database with items indexed semantically and pragmatically, logging conversational paths for reuse, hypertext, and fuzzy information retrieval. The ultimate goal of this work is a communication system which will allow a severely impaired nonvocal person to make a significantly better conversational impact than is possible with present systems.< >

关键词： Speech Information retrieval Databases

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Enumeration of function and bases of three-valued set logic under compositions with Boolean functions

Enumeration of function and bases of three-valued set logic ...

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International Symposium on Multiple-Valued Logic

作者： J. Demetrovics C. Reischer D. Simovici I. Stojmenovic Computer and Automation Institute Hungarian Academy of Sciences Budapest Hungary Department of Mathematics and Comp. Sci. University of Quebec Trois Rivieres Trois-Rivieres QUE Canada Department of Math. and Comp. Sci. University of Massachusetts Boston Boston MA USA Computer Science Department University of Ottawa Ottawa ONT Canada

This paper discusses some classification and enumeration problems in r-valued set logic, which is the logic of functions mapping n-tuples of subsets into subsets over r values. Boolean functions are convenient choice as building blocks in the design of set logic functions. Weak maximal sets are these containing all Boolean functions. The authors give the number of n-ary functions in each weak maximal set and and some properties of intersections of weak maximal sets in r-valued set logic. These properties are used to classify all three-valued set logic functions according to the weak maximal sets they belong to. They prove that there are 29 such classes of functions and give a unary function representative for each of them. Finally, they find the number of n-ary weak Sheffer functions of three-valued set logic, i.e. functions which are complete under compositions with Boolean functions.< >

关键词： Boolean functions Biology computing Automation Biochemistry math.matics computer science Logic functions

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Bidirectional convergence: A cognitive approach to generalisation

Bidirectional convergence: A cognitive approach to generalis...

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International Joint Conference on Neural Networks (IJCNN)

作者： M.K. Weir J.G. Pohill Department of Mathematics and Computer Science University of Saint Andrews Saint Andrews UK University of Saint Andrews Saint Andrews Fife GB Dept. of Math. & Comput. Sci. St. Andrews Univ. UK

We present a cognitive approach to generalisation, Bidirectional Convergence. This is the implementation of a cognitive process we call concept crystallisation, whereby a concept is formed gradually from initially many possibilities which converge to a single possibility under the weight of a series of learning instances shown over a period of time. Bidirectional Convergence (BDC) is a form of concept crystallisation that represents the alternative possible concepts through. Boundary versions of the concept during learning. BDC is an abstraction of Mitchell's symbolic concept learning technique (1982). We describe how BDC is evolved from Mitchell's technique into a form suitable for incorporation into neural networks, BDC is shown to provide a best-fit to given problems.< >

关键词： Convergence Crystallization Learning systems math.matics computer science Neural networks Encoding

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Multiple access protocols for multimedia ATM traffic

Multiple access protocols for multimedia ATM traffic

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： W.M. Moh Yu-Jen Chien Teng-Sheng Moh J. Wang Yi-Wen Yang Mathematics & Computer Science Department San Jose State University Foundation San Jose CA USA Silicon Valley Research Inc. Mountain View CA USA Dept. of Math. & Comput. Sci. San Jose State Univ. CA USA

Multimedia application integrates a variety of media, namely, audio, video, images, graphics, text and data. The ATM (Asynchronous Transfer Mode) technique has been recommended by the CCITT as the transport vehicle for BISDN (Broadband Integrated Service Digital networks) which is designed to provide multimedia traffic services. In this work we study some of the ATM-compatible multiple access MAN (Metropolitan Area Network) protocols, including DQDB (Distributed Queue Dual Bus, also known as IEEE 802.6), CRMA (Cyclic Reservation Multiple Access), DQMA (Distributed Queue Multiple Access), and FDQ (Fair Distributed Queue), and their performance for different kinds of multimedia application, including interactive education, on-line medical information system, and video conferences. We found that all four protocols achieve maximum throughput even at extremely high data rate, which make them suitable for carrying multimedia traffic in high speed networks.

关键词： Access protocols Asynchronous transfer mode Telecommunication traffic Traffic control Graphics Vehicles B-ISDN Metropolitan area networks Multimedia systems Medical information systems

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Recognition by prototypes

Recognition by prototypes

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： R. Basri Department of Applied Math. Weizmann Institute of Science Rehovot Israel

A scheme for recognizing 3D objects from single 2D images is introduced. The scheme proceeds in two stages. In the categorization stage, the image is matched against prototype objects, and in the identification stage, the observed object is matched against the individual models of its class, where classes are expected to contain objects with relatively similar shapes. The advantage of categorizing the object before it is identified is twofold. First, the image is compared to a smaller number of models, since only models that belong to the object's class need to be considered. Second, the cost of comparing the image to each model in a class is very low, because correspondence is computed once for the whole class. The correspondence and object pose computed in the categorization stage to align the prototype with the image are reused in the identification stage to align the individual models with the image. As a result, identification is reduced to a series of simple template comparisons.< >

关键词： Prototypes Libraries Image recognition Costs Laboratories Shape Neuroscience Artificial intelligence Contracts

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