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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： N. Nguyan G. Golub P. Milanfar Sci. Comput. & Comput. Math. Program Stanford Univ. CA USA Scientific Computing and Computational Mathematics Program University of Stanford Stanford CA USA Applied Electromagnetics Lab SRI International Inc. Menlo Park CA USA

Superresolution reconstruction produces a high resolution image from a set of low resolution images. Previous work on superresolution had not adequately addressed the comput.tional issues for this problem. In this paper, we propose efficient block circulant preconditioners for solving the regularized superresolution problem by conjugate gradients. The effectiveness of the preconditioners is demonstrated with superresolution results for a simulated image sequence and a FLIR image sequence.

关键词： Image resolution Layout Spatial resolution Pixel Image reconstruction Image sequences Motion estimation Solids Equations sci.ntific comput.ng

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Genetic micro-rollback self-recovery synthesis

Genetic micro-rollback self-recovery synthesis

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Congress on Evolutionary comput.tion

作者： K. Sookhanaphibarn C. Lursinsap Dept. of Math. & Comput. Sci. Chulalongkorn Univ. Bangkok Thailand Advanced Virtual and Intelligent Computing Laboratory Department of Mathematics and Computer Science Chulalongkom University Bangkok Thailand

Self-recovery micro-rollback synthesis (SMS) has currently become an important issue in high level synthesis. The problem of SMS combines the problem of functional unit scheduling and assignment with the problem of checkpoint insertion and microprogram optimization. It has been shown that these problems are NP-complete. The most studied problem is functional unit scheduling and assignment. Several heuristic techniques, including as soon as possible (ASAP), as last as possible (ALAP), integer programming, spring elasticity model, graph based mobility model, and genetic algorithm, are proposed. However, there are few studies on self-recovery micro-rollback synthesis and the technique of solution space searching by genetic algorithm has not been attempted. We study the feasibility of the genetic algorithm for the problem of SMS constrained on: the number of functional units, control steps, number of checkpoints, and the functional unit areas.

关键词： High level synthesis Circuit faults Genetic algorithms Space technology Very large scale integration Algorithm design and analysis Laboratories math.matics comput.r sci.nce Processor scheduling

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End-to-end jitter analysis in networks of periodic flows

End-to-end jitter analysis in networks of periodic flows

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IEEE Annual Joint Conference: INFOCOM, IEEE comput.r and Communications Societies

作者： K. Sohraby A. Privalov Comput. Sci. Telecommun. Program Missouri Univ. Kansas City MO USA Computer Science Telecommunications University of Missouri Kansas City Kansas City MO USA

Constant bit rate (CBR) traffic is expected to be an important traffic source in high-speed networks. Such sources usually have stringent delay and loss requirements and in many cases they should be delivered exactly as they were generated. A simple delay priority scheme in the network nodes will bound the delay and delay jitter for CBR traffic so that the CBR flows with stringent QoS will only compete with similar traffic flows within the network. We extend the work of Privalov and Sohraby (see IEEE/ACM Trans. on Networking, 1998) to a networking environment and provide the end-to-end jitter analysis of feed-forward connection-oriented networks supporting multiplexed CBR connections. The impact of the traffic mix in each node and the number of nodes in the network on the end-to-end jitter of individual flows are examined.

关键词： Jitter Intelligent networks Telecommunication traffic Asynchronous transfer mode Delay Quality of service Cities and towns comput.r sci.nce Bit rate High-speed networks

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The discrete wavelet transform as a tool for automatic phase pickers

The discrete wavelet transform as a tool for automatic phase...

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IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

作者： P. Ooninex Centre for Math. & Comput. Sci. Amsterdam Netherlands

Seismic data consist of traces, which contain information about a seismic event, but in some period of time may virtually be noise. A trace, which contains seismic information, is called a seismic signal. Seismic signals consist of several typically short energy bursts, called phases, exhibiting several patterns in terms of dominant frequency, amplitude and polarization. Amongst others, significant phases are the P-phase and the S-phase. We present a fast algorithm to detect the S-phase in a seismic signal. In this method we use a combination of traditional S-phase detection methods from seismology and the discrete wavelet transform. First results are presented to demonstrate our new approach.

关键词： Discrete wavelet transforms Phase detection Frequency Seismology math.matics comput.r sci.nce Polarization Motion detection Detectors Data analysis

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Bayesian estimation in an image restoration problem in X-ray fiber diffraction

Bayesian estimation in an image restoration problem in X-ray...

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1998 23rd IEEE International Conference on Acoustics, Speech and Signal Processing, ICASSP 1998

作者： Baskaran, Shyamsunder Millane, R.P. Comput. Sci. and Eng. Program Whistler Center for Carbohydrate Research Purdue Univ. West Lafayette IN 47907 United States

ISBN: (纸本)0780344286

The restoration of an incomplete image from a known part and experimental data in the form of the Fourier amplitude squared sums is formulated as a Bayesian estimation problem. This problem is motivated by the structure completion problem in X-ray fiber diffraction analysis. An appropriate prior of uniformly distributed impulses is used. The Bayesian MMSE and MAP estimates are obtained. Simulations are used to compare the performance of the estimates. The results show that the MMSE estimate significantly outperforms the other estimates. The restored images exhibit some bias towards the known part of the image. This can be partly reduced by an unbiasing procedure. © 1998 IEEE.

关键词： Restoration

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EULER: An EU ‘Telematics for libraries’ project 2nd

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2nd European Conference on Digital Libraries, ECDL 1998

作者： Jost, Michael Brümmer, Anna FIZ Karlsruhe Dept. Math. & Comput. Sci Franklinstr. 11 BerlinD-10587 Germany NetLab Lund University Library P.O. Box 3 LundS-22100 Sweden

ISBN: (纸本)9783540651017

Since April 1998 the European Commission is funding the EULER project (European Libraries and Electronic Resources in math.matical sci.nces) in the framework of the ‘Telematics for Libraries’ sector from the Telematics Applications programme. Main goal of EULER is to integrate different, electronically available information resources in the field of math.matics. EULER aims to construct a “digital library math.matics” from existing heterogeneous sources. The following existing publications-related information resources on math.matics will be covered by the EULER service: – sci.ntific literature databases – library OPACs and document delivery services – electronic journals from academic publishers – archives of preprints and grey literature – quality controlled subject information gateways on the Internet – robot-generated indexes of other relevant Internet resources

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A framework for the graphical specification and execution of complex signal processing applications

A framework for the graphical specification and execution of...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： A. Sicheneder A. Bender E. Fuchs R. Mandl B. Sick Fac. for Math. & Comput. Sci. Passau Univ. Germany Faculty for Mathematics and Computer Science University of Passau Passau Germany

A framework with a tool-supported high-level specification technique is very important for the development of complex signal processing applications containing software-intensive parts (e.g. hybrid systems in automated production processes) in order to provide safe and reliable systems. In this paper we present the concept of a framework, which is an object-oriented CASE-tool offering a graphical specification ability to model and validate a given application and to control its execution. A variety of people having different programming skills is able to use this visual specification technique effectively. Especially users not being interested in implementation details can specify their application on a high abstraction level by connecting reusable and reliable components (modules representing basic algorithms). As a result, complex signal graphs representing the dataflow between the modules are created. The tool supports this software specification technique by automatic type checking for the connections between modules and by changeable module parameters. On the other hand it is easy for software engineers to integrate additional signal processing algorithms into the framework thus building suitable module libraries without considering a specific high-level application.

关键词： Application software Signal processing algorithms Signal processing Production systems Object oriented modeling Automatic control Joining processes Software tools Reliability engineering Software libraries

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Trinomial curves with many rational points

Trinomial curves with many rational points

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： P. Beelan R. Pellikaan Dept. of Math. & Comput. Sci. Tech. Univ. of Eindhoven Netherlands Department of Mathematics and Computing Science Technical University Eindhoven Eindhoven Netherlands

The authors discuss a method to get plane curves with many rational points and a construction to get asymptotically good codes and curves, that is closely related to finding bivariate polynomials representing designs. The number of rational points and the genus is comput.d for plane curves that have a defining equation with three monomials.

关键词： Polynomials Equations math.matics H infinity control

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Parameter-ellipticity for mixed-order elliptic boundary problems

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQ...

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COMPTES RENDUS DE L ACADEMIE DES sci.NCES SERIE I-math.MATIQUE 1997年第12期324卷 1361-1366页

作者： Kozhevnikov, A Dept. of Math and Comput. Sci. Univ. of Haifa 31905 Israel

The aim of this Note is to formulate a parameter-ellipticity condition for the mixed order (Douglis-Nirenberg) boundary-value problems and to prove a theorem on the minimal growth of the resolvent.

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On cyclic Goppa codes and sequence designs

On cyclic Goppa codes and sequence designs

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1997 IEEE International Symposium on Information Theory, ISIT 1997

作者： Moreno, Oscar Dept. of Math. and Comput. Sci. Puerto Rico Univ. Rio-Piedras 00931 Puerto Rico

ISBN: (纸本)0780339568

Berlekamp and Moreno (1973) and Tzeng and Zimmerman (1975) proved that extended binary Goppa codes are cyclic codes. They have parameters (2 m/+1, 2m, 6) and the Goppa polynomial is a quadratic. In this paper we use the result in Berlekamp and Moreno to introduce a sequence design having length 2 m/+1 and correlation ≤ 2/spl radic/(2 m/). The family size is 2 m/-1 and the linear span is 2m. For the correlation, we use the comput.tion of the dual distance of the Goppa codes using Bombieri. © 1997 IEEE.

关键词： Codes (symbols)

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