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3rd International conference Proceedings

International conference on Computational Science, ICCS 2002

ISBN: (纸本)3540435948

The proceedings contain 128 papers. The special focus in this conference is on Computational Geometry and Applications;Computing in Medicine;high performance Computing in Particle Accelerator Science and Technology. The topics include: Recent Developments in Motion Planning;Extreme Distances in Multicolored Point Sets;Balanced Partition of Minimum Spanning Trees;On the Quality of Partitions Based on Space-Filling Curves;The Largest Empty Annulus Problem;Mapping Graphs on the Sphere to the Finite Plane;Improved Optimal Weighted Links algorithms;A Linear Time Heuristics for Trapezoidation of GIS Polygons;The Morphology of Building Structures;Voronoi and Radical Tessellations of Packings of Spheres;Collision Detection optimization in a Multi-particle System;optimization Techniques in an Event-Driven Simulation of a Shaker Ball Mill;Modified DAG Location for Delaunay Triangulation;TIN Meets CAD;Extracting Meaningful Slopes from Terrain Contours;Duality in Disk Induced Flows;Improvement of Digital Terrain Model Interpolation Using SFS Techniques with Single Satellite Imagery;Implementing an Augmented Scene Delivery System;Inspection Strategies for Complex Curved Surfaces Using CMM;The Free Form Deformation of Phytoplankton Models;Curvature Based Registration with Applications to MR-Mammography;Full Scale nonlinear Electromagnetic Inversion for Biological Objects;Propagation of Excitation Waves and Their Mutual Interactions in the Surface Layer of the Ball with Fast Accessory Paths and the Pacemaker;Computing Optimal Trajectories for Medical Treatment Planning and optimization;CAD Recognition Using Three Mathematical Models and 3D Quantification Visualization of Vascular Structures in Magnetic Resonance Angiographic Images.

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Tool path simulation using a virtual 5-axis milling machine

Tool path simulation using a virtual 5-axis milling machine

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IEEE International conference on Industrial Technology (ICIT)

作者： M. Munlin Department of Information Technology Sirindhorn International Institute of Technology Thammasat University Pathum Thani Thailand

Presents the algorithms to simulate nonlinear kinematics of a 5-axis milling machine. The simulator is based on 3D representation and employing the inverse kinematics approach to derive the corresponding rotational and translation movement of the mechanism. The simulator makes it possible to analyze the accuracy of a 3D tool-path based on a prescribed set of the cutter location (CL) points as well as a set of the cutter contact (CC) points with tool inclination angle. The resulting trajectory of the tool is not unique and depends on the initial set up of the machine which in turn is problem dependent. Furthermore, the simulator can be used to simulate the milling process, verify the final cut and estimate the errors of the actual tool-path before the real workpiece is actually being tested with the real machine. Thus, reducing the cost of iterative trial and error. Tool path simulation is verified by a series of cutting experiments performed by means of the proposed software and evaluates the accuracy of milling. It has been shown that the proposed graphical 3D software presents an efficient interactive approach to the interactive modification of a tool path based on an appropriate set of transformations as well as to verification of the tool path optimization algorithms.

关键词： Metalworking machines Kinematics Milling software tools Analytical models Testing Costs performance evaluation software performance software algorithms

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Practical considerations for health monitoring systems

Practical considerations for health monitoring systems

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conference on Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems

作者： Frison, TW Mitchell, E Boeing Co Philadelphia PA 19142 USA

ISBN: (纸本)0819444502

Widespread acceptance of Condition Based Monitoring (CBM) systems has been hampered by, among other things, high costs and inaccurate diagnostics. The advent of new methods for signal processing, local wireless networks, and an industry standard architecture is an opportunity to develop low cost, reliable, practical health monitoring systems. We will discuss the signal processing issues that contribute to poor performance and how new algorithms can provide near optimum detection and recognition of broad-band signals in nonideal, changing, noise. We will then discuss the ONR sponsored Open Systems Architecture (OSA) and how that provides a common operating protocol for health monitoring systems. The heart of the OSA/CBM system is protocols for communication among the hardware and software components of a generalized CBM system which allows rapid and easy integration of specialty components. Finally, we will discuss the impact of several new technologies, including local wireless networks. For example, in many potential installations, almost 90% of the cost of installation is the wiring from the sensors to the processing units. By processing the raw data at the sensor and using a local wireless network to move data and monitor the CBM system itself, the cost of health monitoring can be dramatically reduced.

关键词： machinery diagnostics nonlinear signal processing chaos theory open systems architecture

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Photoresist wafer processing with the SWIFT ion implanter

Photoresist wafer processing with the SWIFT ion implanter

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International conference on Ion Implantation Technology Proceedings

作者： K. Mast R.J. Low D. Knowles M. Junker Applied Materials Inc. Nijmegen Netherlands Applied Materials Nijmegen CZ The Netherlands Parametric and Conductive Implant Division Applied Materials UK Ltd Horsham West Sussex UK Philips Semiconductors PSB Boeblingen Boeblingen Germany

Photoresist (PR) outgassing during implantation can be significant for high current, high energy implants, and if ignored, can result in dose variations. The SWIFT ion implanter uses an intelligent software algorithm in conjunction with fast beam sampling to allow the system to reliably compensate for photoresist outgassing, allowing excellent wafer-to-wafer dose repeatability. In addition, the beam charge recovery tolerance has been made configurable, to allow easy optimization of system throughput versus dose control. In this paper, performance data is presented for photoresist wafers implanted using the intelligent software algorithm compared to bare wafers implanted under identical conditions.

关键词： Resists Implants Electrical resistance measurement software algorithms Throughput Plasma measurements Conducting materials Semiconductor materials Control systems Qualifications

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DSP controlled low-voltage high-current fast-transient Voltage Regulator Module

DSP controlled low-voltage high-current fast-transient Volta...

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

作者： Jaber Abu-Qahouq Nattorn Pongratananukul Issa Batarseh Takis Kasparis University of Central Florida United States

Future generation of microprocessors will require high performance Voltage Regulator Modules (VRMs) that produce tightly regulated low supply voltage with very small deviation window and able to respond very quickly to a large and continuous load transients at high output current while maintaining a high power density. On one hand, the current drawn from the VRM by the microprocessor is continuously changing since it depends at the current use of the microprocessor. On the other hand, high Frequency VRMs as any Power Electronics System is a complex combination of linear, nonlinear, and switching elements that is required to have fast dynamics. Moreover, this complex combination is also real-time system that needs to continuously and instantly monitor and respond to the load changes (the microprocessor). A high performance basic control loop is essential to follow up with such transients. Such controller design is usually complicated especially since it requires high knowledge of the converter and its behavior and accurate converter model that includes nonlinearities and parameters and components variations. DSP has many advantages over the analog circuits when it comes to applying high performance sophisticated control techniques such the simplicity in applying sophisticated control algorithms and modifying them via software revision, lower environmental and noise sensitivity, and less components count. In this paper, a DSP setup to be

关键词： Regulators

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Iterative least square design of DC-leakage free cosine modulated filter banks

Iterative least square design of DC-leakage free cosine modu...

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IEEE conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Yuen-Ting Fong Chi-Wah Kok Department Electrical and Electronic Engineering Hong Kong University of Science and Technology Kowloon Hong Kong China

ISBN: (纸本)0780376323

This paper discusses the design of prototype filter for cosine modulated filter banks. In particular we present a design method to design a prototype filter for DC-leakage free cosine modulated filter banks. The design problem is first formulated as quadratic constrained least square optimization problem. The quadratic constraints are linearized by means of an iterative least-square algorithm that updates the prototype filter using the least-square result obtained in the previous iteration. Simulation results have shown that the proposed design method converges within a few iterations, and high performance cosine modulated filter banks that have large stopband attenuations are obtained with various design specifications for both traditional cosine modulated filter banks and DC-leakage free cosine modulated filter banks.

关键词： Least squares methods Channel bank filters Filter bank Prototypes nonlinear filters Design methodology Phase modulation Constraint optimization Iterative algorithms Frequency

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On the evaluation of JavaSymphony for cluster applications

On the evaluation of JavaSymphony for cluster applications

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IEEE International conference on Cluster Computing

作者： T. Fahringer A. Jugravu B. Di Martino S. Venticinque H. Moritsch Institute for Software Science University of Technology Vienna Vienna Austria Dipartimento di Ingegneria dell Informazione Second University of Naples Rome Italy Department of Statistics and Decision Support System University of Technology Vienna Vienna Austria

In the past few years, increasing interest has been shown in using Java as a language for performance-oriented distributed and parallel computing. Most Java-based systems that support portable parallel and distributed computing either require the programmer to deal with intricate low level details of Java which can be a tedious, time-consuming and error-prone task, or prevent the programmer from controlling locality of data. In contrast to most existing systems, JavaSymphony - a class library written entirely in Java - allows to control parallelism, load balancing and locality at a high level. Objects can be explicitly distributed and migrated based on virtual architectures which impose a virtual hierarchy on a distributed/parallel system of physical computing nodes. The concept of blocking/nonblocking remote method invocation is used to exchange data among distributed objects and to process work by remote objects. We evaluate the JavaSymphony programming API for a variety of distributed/parallel algorithms which comprises backtracking, N-body, encryption/decryption algorithms and asynchronous nested optimization algorithms. performance results are presented for both homogeneous and heterogeneous cluster architectures. Moreover, we compare JavaSymphony with an alternative well-known semi-automatic system.

关键词： Java Parallel processing Distributed computing Programming profession Control systems Clustering algorithms Error correction Libraries Load management Computer architecture

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Combined word-length optimization and high-level synthesis of digital signal processing systems

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IEEE TRANSACTIONS ON COMPUTER-AIDED DESIGN OF INTEGRATED CIRCUITS AND SYSTEMS 2001年第8期20卷 921-930页

作者： Kum, KI Sung, W Seoul Natl Univ Sch Elect Engn Kwanak Gu Seoul 151742 South Korea

Conventional approaches for fixed-point implementation of digital signal processing algorithms require the scaling and word-length (WL) optimization in the algorithm level and the high-level synthesis for functional unit sharing in the architecture level. However, the algorithm-level WL optimization has a few limitations because it can neither utilize the functional unit sharing information for signal grouping nor estimate the hardware cost for each operation accurately. In this study, we develop a combined WL optimization and high-level synthesis algorithm not only to minimize the hardware implementation cost, but also to reduce the optimization time significantly, This software initially finds the WL sensitivity or minimum WL of each signal throughout fixed-point simulations of a signal flow graph, performs the WL conscious high-level synthesis where signals having the similar WL sensitivity are assigned to the same functional unit, and then conducts the final WL optimization by iteratively modifying the WLs of the synthesized hardware model. A list-scheduling-based and an integer linear-programming-based algorithms are developed for the WL conscious high-level synthesis. The hardware cost function to minimize is generated by using a synthesized hardware model. Since fixed-point simulation is used to measure the performance, this method can be applied to general, including nonlinear and time-varying, digital signal processing systems. A fourth-order infinite-impulse response filter, a fifth-order elliptic filter, and a 12th-order adaptive least mean square filter are implemented using this software.

关键词： digital signal processing system fixed-point arithmetic high-level sythesis word-length optimization

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Input space adaptive design: A high-level methodology for energy and performance optimization.

Input space adaptive design: A high-level methodology for en...

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38th Design Automation conference (DAC)

作者： Wang, W Raghunathan, A Lakshminarayana, G Jha, NK Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

ISBN: (纸本)1581132972

This paper presents a high-level design methodology, called input space adaptive design, and new design automation algorithms for optimizing energy consumption and performance. An input space adaptive design exploits the well-known fact that the quality of hardware circuits and software programs can be significantly optimized by employing algorithms and implementation architectures that adapt to the input statistics. We propose a methodology for such designs which includes identifying parts of the behavior to be optimized, selecting appropriate input sub-spaces, transforming the behavior, and verifying the equivalence of the original and optimized designs- Experimental results indicate that such designs can reduce energy consumption by up to 70.6% (average of 55.4%), and simultaneously improve performance by up. to 85.1% (average of 58.1%), leading to a reduction in the energy-delay product by up to 95.6% (average of 80.7%), compared to well-optimized designs that do not employ such techniques.

关键词： Embedded systems

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Application of genetic algorithms for design optimization of a Bragg cell

Application of genetic algorithms for design optimization of...

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Optomechanical Design and Engineering 2001 conference

作者： Nikulin, VV Skormin, VA Binghamton Univ Watson Sch Eng Laser Commun Res Lab Binghamton NY USA

ISBN: (纸本)0819441589

Non-mechanical beam steering technologies, utilizing acousto-optics, allow for achieving the high bandwidth laser beam positioning required for optical communications, laser scanners, LADARs, etc. Properties of the Bragg cell, chiefly responsible for the efficiency and attainable characteristics of the entire positioning system, are assured by successful design of this optical component. However, design of Bragg cells is dominated by experience and intuition of the designers and the potential of this technology is not fully utilized. An optimal design problem of a Bragg cell is formulated on the basis of known equations of the underlying physical phenomena, and a genetic optimization scheme is applied for the solution of the resultant formidable problem. The approach not only yields a design solution, but also allows for the variation of the design criterion and emphasizing particular properties of the resultant component. The prowess of the proposed approach has been demonstrated by design optimization examples.

关键词： mathematical model nonlinear constraint optimization genetic algorithms loss function penalty function performance criterion

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