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computer Animation

作者： B. Hartmann M. Mancini C. Pelachaud Center for Human Modeling and Simulation University of Pennsylvania Australia Department of Computer and System Science University of Rome E2809CLa SapienzaE2809D Italy

This paper introduces Gesture Engine, an animation system that synthesizes human gesturing behaviors from augmented conversation transcripts using a database of highlevel gesture definitions. An abstract scripting language to specify hand-arm gestures is introduced that incorporates knowledge from sign language research, psycholinguistics, and traditional keyframe animation. A new planning algorithm instantiates and adjusts gestures according to communicative context and temporal constraints obtained from a speech synthesizer The system animates an MPEG-4 compliant skeleton using Body Animation Parameters.

关键词： Prototypes Animation Engines Humans Databases Handicapped aids Psychology Context Speech synthesis Synthesizers

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From face features analysis to automatic lip reading

From face features analysis to automatic lip reading

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International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： P. Delmas M. Lievin CITR Department of Computer Science Tamaki Compus University of Auckland Auckland New Zealand Surgical Simulation and Navigation Group Research center Caesar Bonn Germany

An unsupervised framework for face analysis aiming at lip tracking is presented in this paper. A colour video sequence of a speaker's face is simply acquired by a desktop camera under natural lighting conditions and without any particular make-up. After a logarithmic colour transform, a statistical segmentation process regularizes motion and hue information within a spatio-temporal neighbourhood. The hierarchical segmentation labels the different areas of the face. Results are then used to define a region of interest for each feature in the face, particularly the lip contours. Lip corners and associated characteristic points are extracted to initialise an active contours stage. Finally, a speaker's lip shape with inner and outer borders is tracked without user tuning: This unsupervised framework provides geometrical features of the face when no specific model of the speaker face is assumed.

关键词： Face detection Automatic speech recognition Facial animation Robustness Cameras Active contours Humans Face recognition Image color analysis Streaming media

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Scalable atomistic simulation algorithms for materials research

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Scientific Programming 2002年第4期10卷 263-270页

作者： Nakano, Aiichiro Kalia, Rajiv K. Vashishta, Priya Campbell, Timothy J. Ogata, Shuji Shimojo, Fuyuki Saini, Subhash Department of Computer Science Dept. of Mat. Sci. and Engineering University of Southern California Los Angeles CA 90089 United States Concurrent Computing Lab. for MS Biol. Comp. and Visualization Center Louisiana State University Baton Rouge LA 70803 United States Department of Applied Sciences Yamaguchi University Ube 755-8611 Japan Faculty of Integrated Arts and Sci. Hiroshima University Higashi-Hiroshima 739-0046 Japan IT Modeling and Simulation NASA Ames Research Center Moffett Field CA 94035-1000 United States

A suite of scalable atomistic simulation programs has been developed for materials research based on space-time multiresolution algorithms. Design and analysis of parallel algorithms are presented for molecular dynamics (MD) simulations and quantum-mechanical (QM) calculations based on the density functional theory. Performance tests have been carried out on 1,088-processor Cray T3E and 1,280-processor IBM SP3 computers. The linear-scaling algorithms have enabled 6.44-billion-atom MD and 111,000-atom QM calculations on 1,024 SP3 processors with parallel efficiency well over 90%. The production-quality programs also feature wavelet-based computational-space decomposition for adaptive load balancing, spacefilling-curve-based adaptive data compression with user-defined error bound for scalable I/O, and octree-based fast visibility culling for immersive and interactive visualization of massive simulation data.

关键词： Parallel algorithms

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Interacting with Visible Human data using an ImmersaDesk

Interacting with Visible Human data using an ImmersaDesk

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IEEE Annual International Symposium Virtual Reality

作者： Ching-Yao Lin D.T. Chen R.B. Loftin Jian Chen E.L. Leiss Department of Computer Science University of Houston Houston TX USA Office of High Performance Computing and Communication National Library of Medicine Bethesda MD USA Virginia Modeling & Simulation Center Old Dominion University Suffolk VA USA

ISBN: (纸本)0769514928

Interaction with medical volume data has often been difficult, due to the large memory and computational power required. By taking advantage of current high-end graphics hardware, we have developed a volumetric virtual environment that provides the ability to help people interact with the volumetric Visible Human data set. The application enables the user to explore the interior of a virtual human body in a natural and intuitive way.

关键词： Humans Biomedical imaging Virtual reality Displays Hardware Surgery Image segmentation Thorax High performance computing Libraries

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Analysis of feasibility for real time simulation of RT-DEVs models

Analysis of feasibility for real time simulation of RT-DEVs ...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Seong Myun Cho Tag Gon Kim Department of Electrical Engineering & Computer Science KAIST Systems Modeling Simulation Laboratories Daejeon South Korea

Real time simulation has time constraints within which certain model execution has to be completed. Such simulation usually has interactions with a surrounding environment, such as software components, hardware components or human operators. A proper scheduling policy for model execution and an associated method for feasibility analysis of real time execution are needed. This paper proposes a scheduling policy and its feasibility analysis method for real time discrete event system specification (RT-DEVS) models. The proposed analysis method consists of two phases: synchronization analysis and feasibility analysis. The former checks if the model specifications are consistent with their interactions. The latter examines feasibility for real time simulation of a given model under the proposed scheduling policy and a given hardware resource.

关键词： Analytical models Object oriented modeling Timing Real time systems Computational modeling computer simulation Hardware Yarn Kernel Scheduling

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A simulation modelling approach to evaluating alternative policies for the management of the waiting list for liver transplantation

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Health Care Management science 2001年第2期4卷 117-124页

作者： Ratcliffe, Julie Young, Tracey Buxton, Martin Eldabi, Tillal Paul, Ray Burroughs, Andrew Papatheodoridis, George Rolles, Keith Health Economics Research Group Brunel University Uxbridge United Kingdom Centre for Applied Simulation Modelling Computer Science Department Brunel University Uxbridge United Kingdom Liver Transplantation Unit Royal Free Hospital London United Kingdom Health Economics Research Group Brunel University Uxbridge UB83PH United Kingdom

A shortage of donor liver grafts unfortunately results in approximately 10% of patients dying whilst listed for a liver transplant in Europe and the United States. Thus it is imperative that all available organs are used as efficiently as possible. This paper reports upon the application of a simulation modelling approach to assess the impact of several alternative allocation policies upon the cost effectiveness of this technology at one liver transplant centre in the UK. The impact of changes in allocation criteria on the estimated net life expectancy, average net costs and overall cost effectiveness of the transplantation programme were evaluated. The incremental cost effectiveness ratio (ICER) for the base case allocation policy, based upon the time spent on the waiting list (i.e., longest wait first) was £11,557 at 1999 prices. The ICERs associated with an allocation policy based upon age (lowest age first), and an allocation policy based upon the severity of the pre-transplant condition of the patient (with most severely ill patients given a lower priority) were lower than the base case at £10,424 and £9077, respectively. The results of this modelling study suggest that the overall cost effectiveness of the liver transplantation programme could be improved if the current allocation policy were modified to give more weight to the age of the patient and the reduced chances of success of the most severely ill patients. © 2001 Kluwer Academic Publishers.

关键词： simulation methods & models Cost effectiveness Resource allocation Liver transplants

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Scalable Atomistic simulation Algorithms for Materials Research 01

Scalable Atomistic Simulation Algorithms for Materials Resea...

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2001 ACM/IEEE Conference on Supercomputing, SC 2001

作者： Nakano, Aiichiro Kalia, Rajiv K. Vashishta, Priya Campbell, Timothy J. Ogata, Shuji Shimojo, Fuyuki Saini, Subhash Concurrent Computing Laboratory Materials Simulations Biological Computation and Visualization Center Department of Computer Science Department of Physics and Astronomy Louisiana State University United States Logicon Inc. Naval Oceanographic Office Major Shared Resource Center Department of Applied Sciences Yamaguchi University Japan Faculty of Integrated Arts and Sciences Hiroshima University Japan It Modeling and Simulation Nasa Ames Research Center

ISBN: (纸本)158113293X

关键词： Density functional theory

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Cognitive technology: Instruments of mind

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2001年 2117卷 5-8页

作者： Beynon, Meurig Nehaniv, Chrystopher L. Dautenhahn, Kerstin Good, David Gorayska, Barbara Mey, Jacob University of Warwick The Empirical Modeling Research Group Department of Computer Science Coventry United Kingdom University of Hertfordshire Adaptive Systems Research Group Hatfield Herts United Kingdom University of Cambridge United Kingdom City University of Hong Kong Odense University Denmark

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An improved transmission line pulsing (TLP) setup for electrostatic discharge (ESD) testing in semiconductor devices and ICs

An improved transmission line pulsing (TLP) setup for electr...

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IEEE International Conference on Microelectronic Test Structures

作者： J.C. Lee R. Young J.J. Liou G.D. Croft J.C. Bernier RF Analog SiGe BiCMOS Device Modeling Group IBM Burlington VT USA Technology Development Department Intersil Corporation Melbourne FL USA School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA Reliability Engineering Department Intersil Corporation Melbourne FL USA

ISBN: (纸本)0780365119

Transmission line pulsing (TLP) is a useful technique to characterize electrostatic discharge (ESD) events in semiconductor devices. The pulse waveforms generated by a typical TLP set-up, however, are often distorted and oscillatory. In this paper, a new and simple experimental set-up is developed to improve the shape of the TLP waveforms and thus to increase the effectiveness of the TLP technique. Experimental results obtained from the conventional and improved set-ups are presented and compared.

关键词： Electrostatic discharge Transmission lines Circuit testing Impedance Semiconductor devices Coaxial cables Distributed parameter circuits Voltage MOS devices Pulse generation

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The Implementation of Temporal Intervals in Qualitative simulation Graphs

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ACM Transactions on modeling and computer simulation 2000年第3期10卷 215-240页

作者： Ingalls, Ricki G. Morrice, Douglas J. Whinston, Andrew B. Supply Chain Modeling Group Global Integrated Logistics Compaq Computer Corporation 20555 SH 249 Houston TX 77070 Department of Management Science Graduate School of Business University of Texas at Austin Austin TX 78712-1175

In this paper we develop and implement a simulation modeling methodology that combines discrete event simulation with qualitative simulation. Our main reason for doing so is to extend the application of discrete event simulation to systems found in business for which precise quantitative information is lacking. The approach discussed in this paper is the implementation of temporal interval specifications in the discrete event model and the construction of a temporal interval clock for the qualitative simulation model.

关键词： Graph theory

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