Long Chyr Chang

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Because of the advances of computer hardware and software, Computer Aided Instruction (CAI) makes learning effective and interesting through the use of interactive multimedia technology. Recently, Augmented Reality (AR) technology has begun to surge as a new CAI tool because of its ability to create tangible and highly interactive user interface. In(More)
The support of Boolean set operations in free-form solid modeling systems requires the repeated intersection of parametric surfaces. Present approaches to this problem are sequential and must make trade-offs between accuracy, robustness and efficiency. In this paper, we investigate a parallel approach to the surface intersection problem that shows, both(More)
Currently, most city maps browsing or displaying applications only support high-end mobile devices such as PDAs or smartphones. With GSM or GPRS network widely deployed around the world, there is a continuous demand for map applications to support resources constrained mobile phones. The study presents a map-on-demand delivery scheme which utilizes the SVG(More)
Location-based data visualization employing geographical information system and information visualization provides an advanced means to assist with visual data exploration, hypothesis formation and decision making. An effective location-based data visualization system can significantly enhance the communication among decision-makers and facilitate the(More)
With the development of communication technology, every industry has change lot. The medical industry has the same trend at this time. In order to create an environment for different social department, this paper presents a new solution which PaaS is used for mobile health. In the PaaS-Platform, distributed storage and cluster technology have been used for(More)
A high-speed railway virtual reality system can vividly show the train running process, traction and braking control performance using 3D computer graphics technology. As a major part of virtual reality system, the traction and braking performance have great significance to the effect of the rain running. This paper researches the basic theory of train(More)