摘要:

AbstractComputer animation and visualization can facilitate communication between the hearing impaired and those with normal speaking capabilities. This paper presents a model of a system that is capable of translating text from a natural language into animated sign language. Techniques have been developed to analyse language and transform it into sign language in a systematic way. A hand motion coding method as applied to the hand motion representation, and control has also been investigated. Two translation examples are also given to demonstrate the practicality of the system.

ISSN:1049-8907    

DOI:10.1002/vis.4340040203

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractProgramming the motions of an autonomous planetary robot moving in an hostile and hazardous environment is a complex task which requires both the construction of nominal motion plans and the anticipation as far as possible of the effects of the interactions existing between the vehicle and the terrain. In this paper we show how physical models and dynamic simulation tools can be used for amending and completing a nominal motion plan provided by a classical geometrical path planner. The purpose of our physical modeller‐simulator is to anticipate the dynamic behaviour of the vehicle while executing the nominal motion plan. Then the obtained simulation results can be used to assess and optimize the nominal motion plan. In the first part, we outline the physical models that have been used for modelling the different types of vehicle, of terrain and of vehicle‐surface interactions. Then we formulate the motion planning problem through the definition of two basic abstract constructions derived from physical model: the concept of generalized obstacle and the concept of physical target. We show with various examples how it is possible, when using this method, to solve the locomotion problem and the obstacle avoidance problem simultaneously and, furthermore, to provide the human operator with a true force feedback gestural control over the simulated ro

ISSN:1049-8907    

DOI:10.1002/vis.4340040204

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractA common way to simulate the motion and behaviour of a complex system is to approximate it with a multi‐body system based on particles, and to evaluate the particle interactions over time. Normally, the calculations require such a large amount of computer power that methods have been developed to decrease computation time by taking advantage of new computer architectures.These methods have been in use since the early 1980s, but there is still a lack of concepts supporting the application of these methods, to build highly efficient simulation systems with reusable entities.In this paper we describe a new approach for the development of flexible, efficient methods and techniques to control multi‐body systems. The major goal of our concept is the integration of advanced modern simulation techniques such as particle‐based modelling and simulated annealing, and efficient data structures such as octrees and the Greengard algorithm. We introduce high‐level concepts represented by agents, environments, and controllers based on and supported by the object‐oriented paradigm.We demonstrate the flexibility of our new simuation system for applications related to environmental research and air qualit

ISSN:1049-8907    

DOI:10.1002/vis.4340040205

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

摘要:

AbstractThis paper examines the control of complex physical objects in simulation. We introduce a programming paradigm that allows a simulation to be treated as a multi‐level constraint solver. The control programmer is given the ability to specify constraints on the controlled response of mechanisms and to conditionally change these constraints dependent on the state of system. The approach facilitates the development of model‐based, event‐driven control programs. The usefulness of the paradigm is demonstrated through the simulation of a hopping

ISSN:1049-8907    

DOI:10.1002/vis.4340040206

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340040207

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY

ISSN:1049-8907    

DOI:10.1002/vis.4340040202

出版商:John Wiley&Sons, Ltd    

年代:1993

数据来源: WILEY