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Similar relations between organism and product are proposed firstly so that growth design is introduced. Then product gene's new concept and corresponding data structure based on function surface in growth design are put forward. Product gene can be defined as an integrated set of information specifying product's structures and functions and its mechanisms to 'grow' automatically. Furthermore, the...
This paper aims to model a human daily behavior for crowd simulation in order to explore epidemic transmission. Two aspects of the human daily behavior model are particularly discussed which are pedestrian path model and human daily behavior model. In a case study of the severe acute respiratory syndrome (SARS), an individual based model in a virtual community is designed, and a multi-agent approach...
A simulation of hot smoke layer development in a large space building fire has been made. The distributions of temperature, velocity, and smoke concentration at a place of the large space building can be obtained by simulating. With the simulation results, the whole or local fire safety property in the large space building can be evaluated and emergency saving scheme can be scientifically made. Results...
In this paper, we describe a rendering system that is capable of capturing and rendering dynamic environments at about 20 fps using a commercially available PC (1.8 GHz single processor) and IEEE 1394 cameras (each with resolution of 320times240). It does not rely on any additional custom hardware. Such a system permits streaming applications that involve real-time view synthesis from multiple cameras,...
L-systems are powerful rule-based languages for modeling fractal objects and their animation in the fields of virtual plant. But the efficiency of this parallel algorithm needs to be improved because many times rewriting will cost much time and waste lot of computer memory. In this article, an improved algorithm based on the idea of sub-structure is proposed to ameliorate L-systems. Those structures...
In this paper, an automatic method for road network extraction from high resolution aerial image is presented, the recommended input is merely the color image. The modified technique, TPA, and a new way of initial road point extraction are applied. The whole method consists of three modules: 1) the first road detection; 2) statistics and fusing; 3) the second road detection, evaluating and completing...
Barcode has been widely applied in the modern world. This paper presents a fast and robust recognition method of noisy code 39 barcode. The proposed method can be divided into two steps: search and decoding. In the first step, all asterisks in the image are found with evenly defined scan lines and then those with the same directions are matched together to get a valid barcode region. In the second...
This paper presents an action selection mechanism, for virtual flocking animals, inspired by ethology and theories of emotion. We investigate how emotions, in this case fear, affect behaviour, considering deer and sheep as exemplary flocking mammals. The paper also describes and applies a mechanism to measure different types of flocking, using singular values and entropy to compute complexity. Results...
For complicated recognition problem, the number of support vectors is large and recognition speed is low, because some sample were divided into section by error this time. To solve this problem, a method is bought to simplify the support vector machines based the minimal misestimate margin idea. Experiments show that this new support vector machine not only reduces the number of support vectors and...
In this paper, first we briefly introduce the conception of virtual reality, virtual reality modeling language and virtual reality technical application domain. We also analyze the current situation of the modeling language in the development of virtual reality technology. We then present some challenging issues in this area. We finally design a structure to implement an intelligent virtual reality...
The experience of playing a computer game depends on how well the action can capture players' attention. Sometimes people immerse into the game environment so strongly that they forget their actual physical surroundings. In this paper, we introduce a physical running fitness system in the networked virtual environment-VE, which aims at making the exercise session more motivating and rich in experiences...
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