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检索条件"任意字段=Applied Computing 2004 - Proceedings of the 2004 ACM Symposium on Applied Computing"

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Low active-sensitivity allpole active-RC filters using impedance tapering

Low active-sensitivity allpole active-RC filters using imped...

引用

2004 IEEE International symposium on Circuits and Systems - proceedings

作者： Jurišić, Draźen Moschytz, George S. Mijat, Neven University of Zagreb Fac. of Elec. Eng. and Computing Unska 3 10000 Zagreb Croatia Swiss Fed. Inst. of Technol. Zurich Sternwartstrasse 7 8092 Zürich Switzerland

To reduce the low-power allpole active-RC filter's output magnitude sensitivity to passive components, the "impedance tapering" design method was used. This design procedure has been applied to the design of 2 nd- and 3rd-order low-pass (LP) (class 4) Sallen-and-Key filters and has already been published. In this paper the active sensitivity analysis using MATHEMATICA was performed on the same "impedance tapered" filter sections as in [1]. The analysis was performed by calculation of the real filter's transfer-function magnitude which was denormalized to various cut-off frequencies from low to high, using a single-pole model of a real operational amplifier. The amount of active and passive sensitivity reduction was compared using the same degree of impedance tapering. It was demonstrated that both sensitivities, i.e. active and passive, were correspondingly reduced for the same filter. Thus, a judicious selection of component values accounts for a considerable decrease in both passive and active sensitivities.

关键词： Electric filters

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The high performance embedded computing software initiative: C++ and parallelism extensions to the vector, signal, and image processing library standard

The high performance embedded computing software initiative:...

引用

Users Group Conference

作者： Campbell, D Georgia Tech Res Inst Sensors & Electromagnet Applicat Lab Smyrna GA USA

ISBN: (纸本)0769522599

The High Performance Embedded computing Software Initiative (HPEC-SI) program is developing a unified computation and communication Application Programming Interface (API) and framework for high performance signal processing tasks on parallel computers. The goal of the program is to address the high cost of software in Department of Defense (DoD) systems by improving the portability and productivity of signal processing application development threefold, while improving performance by one half compared to current practices. This paper describes the motivation for the HPEC-SI program, its goals and approaches, and progress of the HPEC-SI Working Groups in extending the Vector, Signal, and Image Processing Library (VSIPL) standard to C++ and transparent operation in parallel computing systems. The current draft version of the C++ extensions to VSIPL is described, and highlights of its advantages are considered. This paper also examines results from the Demonstration Working Group, and describes requirements and plans developed by the applied Research Working Group for data parallel extensions to VSIPL and describes Development Working Group progress so far in developing parallel VSIPL.

关键词： Embedded systems

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Analysis of serial MR images of joints

Analysis of serial MR images of joints

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2004 2nd IEEE International symposium on Biomedical Imaging: Macro to Nano

作者： Leung, Kelvin K. Heckemann, Rolf A. Saeed, Nadeem Brooks, Keith J. Buckton, Jacky B. Changani, Kumar Reid, David G. Rueckert, Daniel Hajnal, Joseph V. Holden, Mark Hill, Derek L. G. Division of Imaging Sciences King's College London United Kingdom Imaging Sciences Department Imperial College Hammersmith Hospital Campus London United Kingdom Imaging Centre RA Disease Biology ri-CEDD GlaxoSmithKline United Kingdom Department of Computing Imperial College London United Kingdom

ISBN: (纸本)0780383885

Medical research and drug discovery rely increasingly on making comparisons between MR images from large numbers of subjects, often with multiple time points for each subject. We show how image registration and visualisation technique can be used for quantitative and qualitative assessment of changes over time in an experimental model of rheumatoid arthritis. We applied the technique to automatically delineate two separate bones (the calcaneus and talus) from the in vivo MR images of an ankle (6 subjects, 6 time points each) by propagating labels from pre-labelled "atlas" MRI scans. As an initial analysis, we calculated their volume and rendered their surfaces in 3D to study the disease progression over time. Finally, we investigated the use of Grid computing by coupling it with image analysis and visualisation algorithms to enable remote invocation, parallel execution, and source data input from heterogeneous distributed image repositories. ©2004 IEEE.

关键词： Magnetic resonance imaging

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Image and video based painterly animation 04

Image and video based painterly animation

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proceedings NPAR 2004 - 3rd International symposium on Non-Photorealistic Animation and Rendering

作者： Hays, James Essa, Man School of Computer Science Carnegie Mellon University United States GVU Center College of Computing Georgia Institute of Technology United States

ISBN: (纸本)9781581138870

We present techniques for transforming images and videos into painterly animations depicting different artistic styles. Our techniques rely on image and video analysis to compute appearance and motion properties. We also determine and apply motion information from different (user-specified) sources to static and moving images. These properties that encode spatio-temporal variations are then used to render (or paint) effects of selected styles to generate images and videos with a painted look. Painterly animations are generated using a mesh of brush stroke objects with dynamic spatio-temporal properties. Styles govern the behavior of these brush strokes as well as their rendering to a virtual canvas. We present methods for modifying the properties of these brush strokes according to the input images, videos, or motions. Brush stroke color, length, orientation, opacity, and motion are determined and the brush strokes are regenerated to fill the canvas as the video changes. All brush stroke properties are temporally constrained to guarantee temporally coherent non-photorealistic animations.

关键词： Image analysis

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A sensitive coloring and texture mapping on 3D shapes

A sensitive coloring and texture mapping on 3D shapes

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Kagawa, T Nishino, H Utsumiya, K Oita Univ Oita 87011 Japan

ISBN: (纸本)0780385667

In this paper, we propose a method to support intuitive coloring and texture mapping design of 3D computer graphic shapes. This method generates multiple candidate models applying various kinds of texture patterns and allows users to evaluate them sensitively. The technique called Interactive Evolutionary Computation (IEC) helps them to easily find the pleasant color texture pattern for 3D graphic shapes. To respond the users' evaluation quickly, texture mapping procedure should be easy and light weight. In this method, 3D shapes are reconstructed to a simple representation and applied for simple image warp functions.

关键词： soft computing 3D computer graphics texture mapping genetic algorithm Interactive Evolutionary Computation

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A model for computing the breaker reignition current following interruption of the charging current of long unloaded line

A model for computing the breaker reignition current followi...

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IEEE/PES Transmission and Distribution Conference - Latin America

作者： Saied, M Kuwait Univ Dept Elect Engn Safat 13060 Kuwait

ISBN: (纸本)0780387759

This paper presents a new model for the accurate calculation of the abnormal waveform of the breaker reignition current following the interruption of the capacitive charging current of a long unloaded overhead line section. The breaker is assumed located a some distance from the source. The suggested model is based on the circuit analysis of the cascaded cables and transmission line sections in terms of the ABCD constants using their distributed parameters, e.g. series inductance and shunt capacitance. The new model is verified using the results available in the literature obtained by applying the approximate, much more tedious and time consuming traveling wave approach. The model is applied to investigate the effect of the different parameters (such as the lengths and the surge impedances of the cable and overhead line) on the magnitudes and waveforms of the breaker reignition current.

关键词： power lines cables circuit breaker recovery transients

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Enhancing server availability and security through failure-oblivious computing 6

Enhancing server availability and security through failure-o...

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6th symposium on Operating Systems Design and Implementation, OSDI 2004

作者： Rinard, Martin Cadar, Cristian Dumitran, Daniel Roy, Daniel M. Leu, Tudor Beebee, William S. Computer Science and Artificial Intelligence Laboratory Massachusetts Institute of Technology CambridgeMA02139 United States

We present a new technique, failure-oblivious computing, that enables servers to execute through memory errors without memory corruption. Our safe compiler for C inserts checks that dynamically detect invalid memory accesses. Instead of terminating or throwing an exception, the generated code simply discards invalid writes and manufactures values to return for invalid reads, enabling the server to continue its normal execution path. We have applied failure-oblivious computing to a set of widely-used servers from the Linux-based open-source computing environment. Our results show that our techniques 1) make these servers invulnerable to known security attacks that exploit memory errors, and 2) enable the servers to continue to operate successfully to service legitimate requests and satisfy the needs of their users even after attacks trigger their memory errors. We observed several reasons for this successful continued execution. When the memory errors occur in irrelevant computations, failure-oblivious computing enables the server to execute through the memory errors to continue on to execute the relevant computation. Even when the memory errors occur in relevant computations, failure-oblivious computing converts requests that trigger unanticipated and dangerous execution paths into anticipated invalid inputs, which the error-handling logic in the server rejects. Because servers tend to have small error propagation distances (localized errors in the computation for one request tend to have little or no effect on the computations for subsequent requests), redirecting reads that would otherwise cause addressing errors and discarding writes that would otherwise corrupt critical data structures (such as the call stack) localizes the effect of the memory errors, prevents addressing exceptions from terminating the computation, and enables the server to continue on to successfully process subsequent requests. The overall result is a substantial extension of the range of req

关键词： Computer operating systems

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Approximation algorithms design for disk partial covering problem

Approximation algorithms design for disk partial covering pr...

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proceedings on the International symposium on Parallel Architectures, Algorithms and Networks, I-SPAN

作者： Xiao, Bin Cao, Jiannong Zhuge, Qingfeng He, Yi Sha, Edwin H.-M. Department of Computing Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Department of Computer Science University of Texas at Dallas Richardson TX 75083 United States

Mobile servers are established to provide services for mobile nodes in an anticipated area. If the distribution of mobile nodes can be foreseen, the location of mobile servers becomes critical to the QoS of wireless systems. Under resource and topology constraints, it is very difficult to figure out a solution, or unable to cover all given mobile nodes within limited number of mobile servers. In this paper, we study the issue of the partial covering problem such that part of mobile nodes to be covered. Several approximation algorithms are proposed to cover the maximum number of elements. For real time systems, such as the battle-field communication system, the proposed algorithms with polynomial-time complexity can be efficiently applied. The algorithm complexity analysis illustrates the improvement made by our algorithms. The experimental results show that the performance of our algorithms is much better than other existing 3-approximation algorithm for the robust k-center problem.

关键词： Servers

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3D web-based virtual simulation environments extensibility through interactive non-linear stories 04

3D web-based virtual simulation environments extensibility t...

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8th IEEE International symposium on Distributed Simulation and Real-Time Applications (DS-RT 2004)

作者： Boukerche, A de Araujo, RB Duarte, DD Univ Ottawa SITE Ottawa ON Canada

ISBN: (纸本)0769522327

3D virtual simulation environments (VE) applications have been impelled mainly by the computer games industry, military and industrial training and product design development. However, most of the existing systems are focused on specific tasks and have a supporting structure, which is closely tight to the application. As a consequence, a change in the application usually means a change in the supporting structure too, making it difficult and expensive to develop new or to extend existing VEs. In this paper, we present a novel approach to building and extending 3D virtual simulation environments through the integration of interactive non-linear stories and Virtual Reality. With this approach, VEs are composed as non-linear stories which can be changed either completely or partly, making it easier for developers to build and/or extend VEs applications, such as highly dynamic marketing campaigns to 3D virtual shops, customized training courses, educational and entertainment games, etc. Moreover, the use of a nonlinear story for building a VE application can also facilitate the communication among the different professionals involved in the building of complex VE applications.

关键词： Application software Computational modeling Computer simulation Military computing Industrial training Computer industry Defense industry Toy industry Product design Buildings

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Theory and applied computing: Observations and anecdotes

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29th International symposium on Mathematical Foundations of Computer Science, MFCS 2004

作者： Brand, Matthew Frisken, Sarah Lesh, Neal Marks, Joe Nikovski, Daniel Perry, Ron Yedidia, Jonathan CambridgeMA02139 United States

ISBN: (纸本)3540228233

While the kind of theoretical computer science being studied in academe is still highly relevant to systems-oriented research, it is less relevant to applications-oriented research. In applied computing, theoretical elements are used only when strictly relevant to the practical problem at hand. Theory is often combined judiciously with empiricism. And increasingly, theory is most useful when cross-pollinated with ideas and methods from other fields. We will illustrate these points by describing several recent projects at Mitsubishi Electric Research Labs that have heavy mathematical and algorithmic underpinnings. These projects include new algorithms for: traffic analysis;geometric layout;belief propagation in graphical models;dimensionality reduction;and shape representation. Practical applications of this work include elevator dispatch, stock cutting, error-correcting codes, data mining, and digital typography. In all cases theoretical concepts and results are used effectively to solve practical problems of commercial import. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Belief propagation

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