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24th International VLSI Multilevel Interconnection Conference, VMIC 2007

作者： Le Coz, Y.L. Krishna, D. Petranovic, D.M. Electrical Computer and Systems Engineering Dept. Rensselaer Polytechnic Institute Troy NY 12180-3590 United States Mentor Graphics Corporation 8005 SW Boeckman Rd. Wilsonville OR 97070-9733 United States

We have recently created a stochastic impulse-response (IR) moment-extraction algorithm for RLCM IC-inter connect networks. [1] It employs a newly discovered Sum-over-Paths (SoP) postulate. We report here results of a first-time numerical verification for 1-, 2-, and 3-stage coupled RLCM interconnects. We achieved less than 0.5% and 5% approximate 1-σ error for first- and second-order IR moments, respectively, after only 10K sampled path-sum terms. Our results, we believe, indicate that this type of IR-moment extraction algorithm may find useful application in future CAD-tool computational kernels for massively coupled, high-end digital-IC interconnects.

关键词： Impulse response

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A Sum-over-Paths impulse-response moment-extraction algorithm for IC-interconnect networks: Verification, uncoupled RLCM lines

A Sum-over-Paths impulse-response moment-extraction algorith...

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23rd International VLSI Multilevel Interconnection Conference, VMIC 2006

We have created a stochastic impulse-response (IR) moment-extraction algorithm for RLCM circuit networks. It employs a newly discovered Feynman Sum-over-Paths (SoP) postulate. We report here results of an initial numerical verification, involving an uncoupled RLCM-line benchmark problem. We obtained promising results: less than 0.5% and 10% approximate l-σ error for first- and second-order IR moments, respectively, after only 10K sampled path-sum terms. We believe, in conclusion, that this type of IR-moment extraction algorithm may find useful application in a massively coupled electrical system, such as that encountered in high-end digital-IC interconnects.

关键词： Impulse response

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An FPGA Implementation of a Hopfield Optimized Block Truncation Coding

An FPGA Implementation of a Hopfield Optimized Block Truncat...

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IEEE International Workshop on System-on-Chip for Real-Time Applications

作者： Sherif Saif Hazem M. Abbas Salwa M. Nassar Abdelmonem A. Wahdan Mentor Graphics Corp Cairo Egypt Computers & Systems Department Electronics Research Institute (ERI) Giza Egypt Dept. Computer and Systems Engineering Ain Shams University Cairo Egypt

ISBN: (纸本)1424408989

This paper presents an implementation for image compression using variable block truncation coding (BTC) on a field programmable gate array (FPGA). The compression technique is improved by employing a cost function obtained using Hopfield neural network (HNN), upon which a block is classified as either a high- or a low-detail block. Accordingly, different blocks are coded with different bit rates and thus better compression ratios are achieved. The paper formulates the utilization of HNN within the BTC algorithm in such a way that a viable FPGA implementation is produced. The Xilinx Virtex EBTC implementation has shown to provide a processing speed of about 1.113 times 10 6 of pixels per second with a compression ratio which varies between 1.25 and 2 bits per pixel, according to the image homogeneity

关键词： Field programmable gate arrays Image coding Pixel Hardware Costs Hopfield neural networks Network synthesis System-on-a-chip Real time systems Application software

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Punctuated simplification of man-made objects

Punctuated simplification of man-made objects

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作者： Jang, Justin Wonka, Peter Ribarsky, William Shaw, Christopher D. Georgia Institute of Technology GVU Center College of Computing Atlanta GA 30332 United States Arizona State University PRISM Dept. of Computer Science and Engineering Tempe AZ 85287 United States UNC Charlotte CS Dept. Charlotte Visualization Center Charlotte NC 28223 United States Simon Fraser University Surrey School of Interactive Arts and Technology 14-660 Central City Tower 13450 102 Ave Surrey BC V3T 5X3 Canada Graphics Visualization and Usability Center Georgia Institute of Technology PRISM Lab. ASU Department of Information Technology UNC Charlotte Charlotte Visualization Center IEEE Visualization and Graphics Technical Committee School of Interactive Arts and Technology Simon Fraser University Surrey

We present a simplification algorithm for manifold polygonal meshes of plane-dominant models. Models of this type are likely to appear in man-made environments. While traditional simplification algorithms focus on generality and smooth meshes, the approach presented here considers a specific class of man-made models. By detecting and classifying edge loops on the mesh and providing a guided series of binary mesh partitions, our approach generates a series of simplified models, each of which better respects the semantics of these kinds of models than conventional approaches do. A guiding principle is to eliminate simplifications that do not make sense in constructed environments. This, coupled with the concept of "punctuated simplification", leads to an approach that is both efficient and delivers high visual quality. Comparative results are given.

关键词： Object oriented programming

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The Decorative PixMosaics: Using directional photo tiles

The Decorative PixMosaics: Using directional photo tiles

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2nd Conference on computer graphics, Imaging, and Vision: New Trends 2005

作者： Kim, Jeong Eun Nah, Hyeon Cheol Yoon, Kyung Hyun Computer Graphics Lab. Dept. of Computer Science and Engineering Chung-Ang Univ.

ISBN: (纸本)0769523927

This paper introduces a new kind of mosaic, called the Decorative PixMosaic, where photo tiles of square shapes are used to compose the final image. We can express the resulting image with a similar color distribution of input images from small photo tiles. Based on an input image, user-selected edge features and a wide range of photo tiles, the method can both reproduce the image's textures and emphasize the selected edges by placing tiles that follow the edges. The voronoi site is situated in the center point of the tile using the Centroidal Voronoi Diagram for equally maintaining the distance among the tiles. To express the edges using tiles on the voronoi site as the center point, tiles do not cross image edges and are drawn up as following edge's direction. We use a distribution photo with similar color selected from the photo database. It is important to search for a visually similar photo. Hence we must have a large number of photo tiles. © 2005 IEEE.

关键词： Image processing

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View-dependent mesh streaming with minimal latency

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International Journal of Shape Modeling 2005年第1期11卷 63-89页

作者： Kim, Junho Lee, Seungyong Kobbelt, Leif Dept. of Computer Science and Engineering POSTECH San 31 Hyoja-Dong Pohang 790-784 Korea Republic of Computer Graphics Group RWTH-Aachen Lehrstuhl für Informatik VIII 52056 Aachen Germany

This paper presents a novel framework for view-dependent streaming of multiresolution meshes. In contrast to conventional progressive streaming in which the resolution of a model changes globally, our server dynamically adjusts the transmission order of the detail data with respect to the client's current viewpoint. By extending the truly selective refinement scheme for progressive meshes to a client-server architecture, we accomplish an efficient view-dependent streaming framework that minimizes network communication overhead to facilitate minimal latency of mesh updates for varying viewpoints. Furthermore, we reduce the per-client session data on the server side by using a special data structure for encoding which vertices have already been transmitted to each client. We provide an analytic comparison of several view-dependent streaming frameworks and show that our framework outperforms others in terms of the network overhead. Experimental results indicate that our framework is efficient enough for a broadcast scenario where one server streams geometry data to multiple clients with different view points. © World Scientific Publishing Company.

关键词： Image processing

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Performance of neural classifiers for fabric faults classification

Performance of neural classifiers for fabric faults classifi...

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International Joint Conference on Neural Networks, IJCNN 2005

作者： Abdulhady, Mohamed Dakrowry, Yaser H. Abbas, Hazem M. Nassar, Salwa Giza Egypt Dept. Computer and Systems Engineering Ain Shams University Cairo Egypt Mentor Graphics Egypt Cairo Egypt

In this work, fabric faults classification using CNeT [1] is studied. The basic objectives are to improve the features selection used in CNeT [1] classifier and compare the results with other neural network classifiers. The algorithm adopted here is composed of three stages. The first stage is a preprocessing phase where defects are detected and localized. Since every detected defect has its different shape and size, all defects are normalized to a predetermined size. In the second stage a set of features are calculated for each defect using the Haralick [2] [3] spatial features. The improved classification performance is achieved by employing a statistical method to select the most important features that can be used in classification. This is done by calculating a classification factor [4] for each feature vector to determine its effect in the classification process. During the third and last stage, those features are then used to train a competitive neural tree (CNeT) [1] designed to learn in a supervised manner the class associated with each set of features. The network can be then used to test and classify new defects. The approach is experimented with a set of images of fault free and faulty textiles and output results are compared with Radial Basis Function classifiers. © 2005 IEEE.

关键词： Neural networks

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Interaction-enhanced simulation workspace for immersive collaboration

Interaction-enhanced simulation workspace for immersive coll...

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Asian Simulation Conference 2005, ASC 2005 and the 6th International Conference on System Simulation and Scientific Computing, ICSC 2005

作者： Kim, Myoung-Hee Rhee, Seon-Min Park, Jiyoung Kim, Ju-Haye Cho, Eun You, Hyo-Sun Dept. of Computer Science and Engineering Ewha Womans University Seoul Korea Republic of Center for Computer Graphics and Virtual Reality Ewha Womans University Seoul Korea Republic of

A large surround display such as a CAVE™-like system can be used as an immersive and collaborative simulation workspace, since it maximizes visual realism by a stereo effect. However, methods for working interactively in a 3D workspace rather than on a 2D display are not yet sufficiently developed. We suggest three interaction techniques to enhance a simulation workspace for immersive collaboration. The transparent panel interface is an intermediate medium which helps direct interaction such as object selection, manipulation and navigation. A miniature of the virtual world is shown through the panel, and the user interacts with that instead of with virtual objects which may be located far from them. The visual guider provides dept. information which allows a user to know the distance from a virtual object and where they are in a large virtual environment. Vision-based tracking using IR makes it possible to interact naturally and intuitively with objects.

关键词： Human computer interaction

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Interaction-enhanced Simulation Workspace for Immersive Collaboration

Interaction-enhanced Simulation Workspace for Immersive Coll...

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Asian Simulation Conference/The 6th International conference on system Simulation and Scientific Computing

作者： Myoung-Hee Kim Seon-Min Rhee Jiyoung Park Ju-Haye Kim Eun Cho Hyo-Sun You Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea Center for Computer Graphics and Virtual Reality Ewha Womans University Seoul Kerea Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea Dept. of Computer Science and Engineering Ewha Womans University Seoul Kerea

A large surround display such as a CAVETM-like system can be used as an immersive and collaborative simulation workspace, since it maximizes visual realism by a stereo effect. However, methods for working interactively in a 3D workspace rather than on a 2D display are not yet sufficiently developed. We suggest three interaction techniques to enhance a simulation workspace for immersive collaboration. The transparent panel interface is an intermediate medium which helps direct interaction such as object selection, manipulation and navigation. A miniature of the virtual world is shown through the panel, and the user interacts with that instead of with virtual objects which may be located far from them. The visual guider provides dept. information which allows a user to know the distance from a virtual object and where they are in a large virtual environment. Vision-based tracking using IR makes it possible to interact naturally and intuitively with objects.

关键词： virtual reality, human computer interaction, immersive simulation environment, interactive simulation workspace.

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A multi-layered approach to optical burst-switched based grids

A multi-layered approach to optical burst-switched based gri...

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International Conference on Broadband Networks (BroadNets)

作者： F. Farahmand M. De Leenheer P. Thysebaert B. Volckaert F. De Turck B. Dhoedt P. Demeestert J.P. Jue Department of Computer Electronics and Graphics Technology Central Connecticut State University Gent Belgium Department of Computer Electronics and Graphics Technology Central Connecticut State University Dept. of Electrical Engineering and Computer Science The University of Texas at Dallas Department of Information Technology Ghent University-IBBT-IMEC Gent Belgium Department of Electrical Engineering and Computer Science University of Texas Dallas Gent Belgium Dept. of Information Technology Ghent University - IBBT - IMEC Gaston Crommenlaa Belgium

In this paper we consider implementing optical burst switching as an alternative approach to meet computationally intensive grid applications. Such architecture has been referred to as grid-over-OBS (GoOBS). We first present a unique layered architecture for grid-over-OBS and position OBS protocol stack within the framework of the layered grid architecture. Then, we present a generic framework for anycast routing in the context of GoOBS when requests don't have explicit addresses and they can be serviced by any appropriate grid resource. We develop several algorithms to support an casting when only a single copy of a request is transmitted. Through simulation analysis, we show the performance of our anycast algorithms and compare them with the shortest-path unicast routing in which all jobs have specific addresses. In our performance analysis, we focus on average end-to-end delay and blocking probability of requests

关键词： computer architecture Routing Performance analysis Optical burst switching computer applications Grid computing Optical computing Protocols Context-aware services Casting

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