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Heterogeneous solid modeling for layered manufacturing

CIRP Annals - Manufacturing Technology 2000年第1期49卷 109-112页

作者： Dutta, D. Shpitalni, M. Dept. of Mechanical Engineering University of Michigan Ann Arbor MI United States Lab. for Computer Graphics and CAD Dept. of Mechanical Engineering Technion - Israel Inst. of Technol. Haifa Israel

We consider layered manufacturing as a fabrication technique for metallic, functional parts. While commercial machines still do not support metals, several research systems are already in existence in universities and research laboratories. Such systems can create multi-material parts and can vary material composition within the layer. A key enabling technology for the automation of such layered manufacturing systems is heterogeneous solid modeling. Current CAD systems do not provide the capability to deal explicitly with material heterogeneity. We provide an overview of this new field, propose a method for modeling and representing material in addition to geometry and topology, and discuss some related research.

关键词： Product design

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Preface

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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2001年 2037卷 V-VI页

作者： Boers, Egbert J. W. Cagnoni, Stefano Gottlieb, Jens Hart, Emma Lanzi, Pier Luca Raidl, Günther R. Smith, Robert E. Tijink, Harald Leiden Institute of Advanced Computer Science Leiden University Niels Bohrweg 1 Leiden Netherlands Dept. of Computer Engineering University of Parma Parco Area delle Scienze 181/a Parma Italy SAP AG Neurottstrasse 16 Walldorf Germany Napier University School of Computing 219 Colinton Road Edinburgh United Kingdom Polytechnic of Milan Piazza Leonardo da Vinci 32 Milan Italy Algorithms and Data Structur es Group Institute of Computer Graphics Vienna University of Technology Favoritenstrasse 9-11/186 Vienna Austria The Intelligent Computer Systems Centre The University of The West of England Coldharbour Lane Frenchay Bristol United Kingdom Data and Knowledge Systems Department National Aerospace Laboratory NLR P.O. Box 153 Emmeloord Netherlands

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Fast post-placement rewiring using easily detectable functional symmetries 00

Fast post-placement rewiring using easily detectable functio...

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Proceedings of the 37th Annual Design Automation Conference

作者： Chih-Wei Chang Chung-Kuan Cheng Peter Suaris Malgorzata Marek-Sadowska Dept. of Electrical and Computer Engineering University of California Santa Barbara Santa Barbara CA Dept. of Computer Science and Engineering University of California San Diego La Jolla CA Mentor Graphics Corporation Wilsonville Oregon

ISBN: (纸本)9781581131871

Timing convergence problem arises when the estimations made during logic synthesis can not be met during physical design. In this paper, an efficient rewiring engine is proposed to explore maximal freedom after placement. The most important feature of this approach is that the existing placement solution is left intact throughout the optimization. A linear time algorithm is proposed to detect functional symmetries in the Boolean network and is used as the basis for rewiring. Integration with an existing gate sizing algorithm further proves the effectiveness of our technique. Experimental results are very promising.

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Utilizing image processing techniques for 3D reconstruction of laser-scanned data

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CIRP Annals - Manufacturing Technology 1999年第1期48卷 99-102页

作者： Fischer, A. Manor, A. Lab. for Computer Graphics and CAD Dept. of Mechanical Engineering Technion - Israel Inst. of Technol. Haifa Israel

In Reverse engineering, laser scanners are commonly used since they can sample 3D data fast and very accurately relative to other systems. Laser scanner systems, however, yield an enormous amount of irregular and scattered digitized point data that requires intensive processing in order to reconstruct the surface of the object. It appears that combining 3D scanned data with 2D intensity images can significantly improve the reconstruction process. This paper proposes a new adaptive reconstruction method that integrates information from a CCD camera with scanned laser data. The method is based on: (a) Detecting a 3D boundary of the parametric base surface. (b) Adaptively reconstructing a parametric base surface with a non-self-intersecting grid. (c) Calculating the parameterization of the 3D sampled points. (d) Fitting the surface by applying a least square (LSQ) approximation method with boundary constraints. The feasibility of the parameterization algorithm is demonstrated on sculptured free objects.

关键词： Image reconstruction

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Principal stream surfaces 97

Principal stream surfaces

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Proceedings of the 8th conference on Visualization '97

作者： Wenli Cai Pheng-Ann Heng Fraunhofer Institute for Computer Graphics Dept. of Computer Science & Engineering The Chinese University of Hong Kong

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An efficient assertion checker for combinational properties 97

An efficient assertion checker for combinational properties

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Proceedings of the 34th annual Design Automation Conference

作者： Gagan Hasteer Anmol Mathur Prithviraj Banerjee Dept. of Computer Science University of Illinois Urbana Il Silicon Graphics 2011 N. Shoreline Blvd. Mountain View CA Electrical and Comp. Engineering Northwestern University Evanston IL

ISBN: (纸本)9780897919203

Formally verifying properties of signals in a circuit hasseveral applications in an equivalence checking based formalverification *** a hierarchical design, functionalityis divided across *** necessitates the useof constraints on input signals of a block to avoid *** such input constraints requires assertionchecking at the outputs of modules generatingthe constrained *** this paper, we present anefficient assertion checker for combinational propertieswhich avoids the BDD explosion problem by finding anoptimal intermediate correlation free *** hasbeen successfully used in an industrial setting to uncovera number of bugs.

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Parallel programming with CAPSE-A case study 4

Parallel programming with CAPSE-A case study

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4th Euromicro Workshop on Parallel and Distributed Processing, PDP 1996

作者： Gruber, B. Haring, G. Kranzlmuller, D. Volkert, J. University of Vienna Institute of Applied Computer Science Aid Information Systems Dept. of Advanced Computer Engineering Lenaugasse 218 ViennaA-1080 Austria Johannes Kepler University Linz Institute of Computer Science Dept. for Graphics and Parallel Processing Altenbergerstr. 69 LinzA-4040 Austria

ISBN: (纸本)0818673761

The CAPSE environment for computer Aided Parallel Software engineering is intended to assist the developer in the crucial task of parallel programming. The methodology of CAPSE is based on direct manipulative graphical creation and editing of scalable workload characterizations of MIMD algorithms. This paper presents the basic concepts of this methodology and an example of a parallel Poisson solver. The workload characterization representing the computation and communication behavior of the algorithm is based on directed acyclic task graphs, which achieve scalability by composing the task graph of scalable basic patterns instead of single node and arcs. The composition and the usage of these basic patterns is described in the light of designing the Poisson solver algorithm. The resulting task graph is used to predict the program's performance on a nCUBE 2 distributed memory machine and the PAPS simulator. © 1996 IEEE.

关键词： Parallel programming

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Presence in virtual environments as a function of visual and auditory cues

Presence in virtual environments as a function of visual and...

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IEEE Annual International Symposium Virtual Reality

作者： C. Hendrix W. Barfield Dept. of Ind. Eng. Washington Univ. Seattle WA USA Laboratory for Interactive Computer Graphics and Human Factors Department of Industrial Engineering University of Washington Seattle WA USA

The paper reports the results of two experiments each investigating the sense of presence within visual and auditory virtual environments. The variables for the studies included the presence or absence of head tracking, the presence or absence of stereoscopic cues, the geometric field of view (GFOV) used to design the visual display, the presence or absence of spatialized sound and the addition of spatialized versus non-spatialized sound to a stereoscopic display. In both studies, subjects were required to navigate a virtual environment and to complete a questionnaire designed to ascertain the level of presence experienced by the participant within the virtual world. The results indicated that the reported level of presence was significantly higher when head tracking and stereoscopic cues were provided, with more presence associated with a 50 and 90 degree GFOV when compared to a narrower 10 degree GFOV. Further, the addition of spatialized sound did significantly increase ones sense of presence in the virtual environment, on the other hand, the addition of spatialized sound did not increase the apparent realism of that environment.

关键词： Virtual environment Auditory displays computer displays Human factors computer graphics Industrial engineering Navigation Software measurement Software design Design engineering

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Out of Site, Still in Mind? A Case Study in Video Mediated Communication

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Proceedings of the Human Factors and Ergonomics Society Annual Meeting 1992年第3期36卷 242 - 246页

作者： Beverly L. Harrison Mark H. Chignell Ronald M. Baecker Dept. of Industrial Engineering and Dynamic Graphics Project Computer Systems Research Institute University of Toronto Toronto Ontario Canada M5S 1A4 Dept. of Industrial Engineering University of Toronto Toronto Ontario Canada M5S 1A4 Dynamic Graphics Project Computer Systems Research Institute University of Toronto Toronto Ontario Canada M5S 1A4

Video mediated communication alters our perception of the way in which we interact and communicate. In contrast to face to face or audio only (e.g., telephone) communication, there is relatively little systematic research on the effect of video conferencing on communication within groups of people at dispersed locations (Harrison, 1991b; Harrison et al, 1992b; Sellen, 1992; Wolf, 1988; Cohen, 1982; Short, Williams, and Christie, 1976). In this paper we describe a study of how participants at three distant locations perceived differences between face to face (within site) and video mediated (between site) communication. Results indicate that participants perceived between site, mediated communication to be unnatural and uncomfortable. They felt there were problems with gaining floor control and with conversation flow. Additionally, participants perceived the between site, mediated communication to be less interactive, less social, and less enjoyable than the face to face, within site communication. The insights gained through this and other case studies, summarized here, will be used to guide our future research. This study is one in a series of field trials and controlled experiments aimed at understanding the human factors issues associated with video communication and the design of such systems.

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CONCEPTIONAL CONSIDERATIONS FOR A TOWED VESSEL SAFETY KNOWLEDGE SYSTEM

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NAVAL ENGINEERS JOURNAL 1990年第1期102卷 68-73页

作者： LATORRE, R LESAGE, M Dr. Robert Latorre:received a BSE (Naval Architecture and Marine Engineering) in 1971 and an MSC in 1972 from the University of Michigan. After language training at Middle Language College he studied at the University of Tokyo's Department of Naval Architecture where he received a MSE in 1975 and a doctor of engineering degree in 1978. As an assistant professor at the University of Michigan (1979–1983) Dr. Latorre began his study of towed vessel safety and river tow design. This resulted in a multiyear project sponsored by the U.S. Dept. of Transportation on towed vessel safety. This work was continued after he joined the University of New Orleans where he designed a 38.3m × 4.6m × 0.03–2.1m variable depth towing tank for ship offshore and inland waterway hydrodynamic studies. His research interests include cavitation noise high speed craft design and computational fluid dynamics. During the 1986 academic year he taught as a professor at the University of Tokyo's Mechanical Engineering Department. During this time he began to interact with artificial intelligence robotics and computer vision researchers in Japan. Mauricio Le Sage:received his BSC (bachelor's degree) in 1986. He is a graduate student at the University of New Orleans. His research interests are in the areas of artificial intelligence computer graphics and expert systems. At the time of this paper a joint effort entitled “An Inductive Approach To Plagiarism Detection In Computer Programs” by Gerard K. Rambally and Mauricio Le Sage was pending publication.

A new model is introduced for avoiding accidents where a tugboat capsizes or trips when towing a larger vessel. The development of the Tripping Avoidance Knowledge Base (TAKB) is described in terms of the relevant descriptive parameters, the graphical representation of the knowledge base and its conversion to a decision matrix is also shown. As with any AI application in a new and promising area, there are many unclear points which this paper highlights. The paper closes with the authors' recommendations for future development and refinement of the knowledge base.

关键词： Tugboats

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