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A natural language interpreter for plate girder design

Engineering with computers 1986年第3期1卷 127-147页

作者： Wentof, R. Law, K.H. Ackroyd, M.H. Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy 12180 NY United States Department of Civil Engineering Rensselaer Polytechnic Institute Troy 12180 NY United States Gerber Systems Technology Inc. South Windsor 06074 CT United States

One of the major problems in developing computeraided design software is the establishment of effective man-machine communication. This paper describes a computer-aided plate girder design software package and its man-machine interface using natural language processing techniques. The natural language interpreter takes advantage of the user's communication and technical skills and accepts commands in the user's native language. The user can verify the correct interpretation of the commands from the responsive graphic display of the design. © 1986 Springer-Verlag New York Inc.

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Human media technology-the human-centered, sustainable technology development

Human media technology-the human-centered, sustainable techn...

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computer graphics International

作者： J.L. Encarnacao F. Loseries C. Sifaqui Fraunhofer-IGD Darmstadt Germany Computer Graphics Center ZGDV Darmstadt Germany Interactive Graphics Systems Group. Department of Computer Science Darmstadt University of Technology Darmstadt Germany

The development of the Internet, the Web, and Java let us believe that computing technology seems to become an integral part of our daily environment that hopefully supports us in improving the quality of life. But what does this mean to the future of information technology development? This paper presents visions towards sustainable, human-centered technology developments. New trends in human computer interaction and human information interaction are necessary for enabling even the naive user to communicate and interact with computers. What we need is a paradigm shift from the conventional information technology towards a human media technology which focus on the interaction manner between human beings and information space or amongst human beings through information space.

关键词： computer graphics Internet Human computer interaction computer science Electronic mail Java Read only memory Space technology Environmental management Home computing

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Remote analysis for brain shift compensation 4th

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4th International Conference on Medical Image Computing and computer-Assisted Intervention, MICCAI 2001

作者： Hastreiter, P. Engel, K. Soza, G. Bauer, M. Wolf, M. Ganslandt, O. Fahlbusch, R. Greiner, G. Ertl, T. Nimsky, Ch Dept. Of Neurosurgery University of Erlangen-Nuremberg Germany Visualization and Interactive Systems Group University of Stuttgart Germany Computer Graphics Group University of Erlangen-Nuremberg Germany Knowledge Processing Group Bavarian Research Center for Knowledge-Based Systems Germany

ISBN: (纸本)3540426973

The compensation for brain shift is assisted by intraoperative imaging. For the purpose of fast registration and interactive visualization, a framework is presented based on local desktop computers and remote high-end computers with a maximum of compute power and graphics capacity. In this context, functional markers resulting from preoperative measurements (MEG, fMRI) are mapped to the intraoperative situation. Overall, results from 5 cases demonstrate the value of the suggested environment. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Visualization

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Automatic three‐dimensional mesh generation by the modified‐octree technique

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International Journal for Numerical Methods in Engineering 1984年第11期20卷 1965-1990页

作者： Yerry, Mark A. Shephard, Mark S. Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy New York United States

An approach for the fully automatic generation of three‐dimensional finite element meshes is presented. The method is specifically designed for use with solid modelling systems which provide a complete and unique definition of the geometry of a part. The method follows from the basic concepts of the octree encoding technique with specific modifications made to produce valid, user controllable finite element meshes. Example problems are included to demonstrate the technique. Copyright © 1984 John Wiley & Sons, Ltd

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An interactive computer graphics Package for Linear Multivariable System Design

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IFAC Proceedings Volumes 1983年第19期16卷 147-157页

作者： T. Sadeghi M.J. Wozny Analytical Science Department Fairchild Republic Company Farmingdale New York USA Center for Interactive Computer Graphics Rensselaer Polytechnic Institute Troy New York USA

An interactive computer graphics package has been developed for computer aided design of linear multivariable control systems. The package employs an effective human/computer interface achieved through the use of menus orchestrated in an hierarchial tree structure. Numerous state-of-the art design algorithms and analysis methods are incorporated which communicate through the interactive and asynchronous function control interfaces of computer graphics system, creating an environment attractive to both industrial users and academics.

关键词： control system software interactive graphics graphical procedures menus tree structure

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LINEAR MULTIPOINT CONSTRAINTS APPLIED VIA TRANSFORMATION AS PART OF A DIRECT STIFFNESS ASSEMBLY PROCESS

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INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 1984年第11期20卷 2107-2112页

作者： SHEPHARD, MS Rensselaer Polytechnic Institute Troy New York U.S.A. Associate Director Center for Interactive Computer Graphics and Associate Professor of Civil Engineering.

A procedure is presented for the application of linear multipoint constraints. The procedure employs the transformation approach for constraint application which reduces the number of equations to be solved by the number of constraints. However, the matrix operations implied by the approach are avoided by the proper construction of the constraint equations. A specific procedure for carrying out the constraint application process as part of the assembly of the global stiffness matrix is given.

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MultiAR: A Multi-User Augmented Reality Platform for Biomedical Education 46

MultiAR: A Multi-User Augmented Reality Platform for Biomedi...

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46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2024

作者： Perz, Markus Luijten, Gijs Kleesiek, Jens Schmalstieg, Dieter Egger, Jan Gsaxner, Christina West German Cancer Center Cancer Research Center Cologne Essen Essen Germany University of Stuttgart Institute for Visualization and Interactive Systems Stuttgart Germany Graz University of Technology Institute of Computer Graphics and Vision Graz Austria University Medicine Essen Institute for Artificial Intelligence in Medicine Essen Germany Essen Germany

ISBN: (纸本)9798350371499

This paper addresses the growing integration of Augmented Reality (AR) in biomedical sciences, emphasizing collaborative learning experiences. We present MultiAR, a versatile, domain-specific platform enabling multi-user interactions in AR for biomedical education. Unlike platform-specific solutions, MultiAR supports various AR devices, including handheld and head-mounted options. The framework extends across domains, augmenting biomedical education applications with collaborative capabilities. We define essential requirements for a multi-user AR framework in education, detail MultiAR's design and implementation, and comprehensively evaluate it using anatomy education examples. Quantitative and qualitative analyses, covering system performance, accuracy metrics, and a user study with 20 participants, highlight the urgent need for a tailored collaborative AR platform in biomedical education. Results underscore enthusiasm for collaborative AR technology, endorsing MultiAR as an accessible, versatile solution for developers and end-users in biomedical education. © 2024 IEEE.

关键词： Augmented reality

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Intraoperative registration of preoperative 4D cardiac anatomy with real-time MR images

Intraoperative registration of preoperative 4D cardiac anato...

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IEEE Symposium on Bioinformatics and Bioengineering (BIBE)

作者： Xifeng Gao Nikhil V. Navkar Dipan J. Shah Nikolaos V. Tsekos Zhigang Deng Computer Graphics and Interactive Media Lab Houston TX USA Methodist DeBakey Heart & Vascular Center Houston TX USA Department of Computer Science University of Houston Houston TX USA

Co-registering pre- and intra- operative MR data is an important yet challenging problem due to different acquisition parameters, resolutions, and plane orientations. Despite its importance, previous approaches are often computationally intensive and thus cannot be employed in real-time. In this paper, a novel three-step approach is proposed to dynamically register pre-operative 4D MR data with intra-operative 2D RT-MRI to guide intracardiac procedures. Specifically, a novel preparatory step, executed in the pre-operative phase, is introduced to generate bridging information that can be used to significantly speed up the on-the-fly registration in the intraoperative procedure. Our experimental results demonstrate an accuracy of 0.42 mm and a processing speed of 26 FPS of the proposed approach on an off-the-shelf PC. This approach, is in particularly developed for performing intra-cardiac procedures with real-time MR guidance.

关键词： Real-time systems Heart Accuracy Spatial resolution Computational modeling Registers Solid modeling

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Visual and force-feedback guidance for robot-assisted interventions in the beating heart with real-time MRI

Visual and force-feedback guidance for robot-assisted interv...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： Nikhil V. Navkar Zhigang Deng Dipan J. Shah Kostas E. Bekris Nikolaos V. Tsekos The Computer Graphics & Interactive Media Lab and the Medical Robotics Lab at University of Houston TX USA The Computer Graphics & Interactive Media Lab and Computer Science Department at University of Houston Houston TX USA Methodist DeBakey Heart & Vascular Center Methodist Hospital Houston TX 77030 USA The Computer Science & Engineering Department’ University of Nevada Reno NV USA The Medical Robotics Lab and Computer Science Department at University of Houston Houston TX USA

Robot-assisted surgical procedures are perpetually evolving due to potential improvement in patient treatment and healthcare cost reduction. Integration of an imaging modality intraoperatively further strengthens these procedures by incorporating the information pertaining to the area of intervention. Such information needs to be effectively rendered to the operator as a human-in-the-loop requirement. In this work, we propose a guidance approach that uses real-time MRI to assist the operator in performing robot-assisted procedure in a beating heart. Specifically, this approach provides both real-time visualization and force-feedback based guidance for maneuvering an interventional tool safely inside the dynamic environment of a heart's left ventricle. Experimental evaluation of the functionality of this approach was tested on a simulated scenario of transapical aortic valve replacement and it demonstrated improvement in control and manipulation by providing effective and accurate assistance to the operator in real-time.

关键词： Manipulators Robot kinematics Real time systems Visualization Instruction sets Heart

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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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