Contents Chapter 1 Introduction and Basic Technology : : : : : : : : : : : : : : : : : : : : : 1 1.1 Introduction : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 1 1.2 Overview of the Techniques Used in this Project : : : : : : : : : : : : : : 2 1.2.1 WWW Techniques : : : : : : : : : : : : : : : : : : : : : : : : : : 2 1.2.2 Distributed Computing and Client/Server Model : : : : : : : : : 4 1.2.3 Security : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 4 2 System Specification : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 6 2.1 Introduction : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 6 2.2 User Management : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 7 2.3 Resource Management : : : : : : : : : : : : : : : : : : : : : : : : : : : : 8 2.

We present a data model for movies and movie databases. A movie is considered to be a 2-dimensional semialgebraic figure that can change in time. We give a number of computability results concerning movies: it can be decided whether a frame of a movie is only a topologically transformation of another frame; a movie has a finite number of scenes and cuts and these can be effectively computed. Based on these computability results we define an SQLlike query language for movie databases. This query language supports most movie editing operations like cutting, pasting and selection of scenes. 1.

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This paper proposes a new 3D graphics programming environment for Web3D on the Internet. To develop 3D graphics programs on the Internet is not easy because there is no popular 3D graphics library like OpenGL. For this purpose, we developed a 3D graphics library called jGL by using Java exclusively. jGL is a general-purpose 3D graphics library, and its API (Application Programming Interface) is defined in a manner quite similar to that of OpenGL. Since jGL offers the same functionalities as OpenGL, the programmers can use it easily. Furthermore, since people can use some simple Java programs on cellular phones recently, the migration experimentation toward i-αppli is also described in this paper. Moreover, VRML (Virtual Reality Modeling Language) is a standard file format for describing 3D models on the Internet. To display a 3D model on the Internet, people may like to use the VRML file format. Therefore, we also developed a VRML library called jVL by using Java exclusively as an extension of jGL. In this paper, the results and some detail descriptions are updated and different from those in [3]. Key words: OpenGL; VRML; Web3D; Java; graphics library. 1.

The specification of virtual world objects is an important part of virtual environment design. However, identifying the required level of behaviour and geometric decomposition for virtual objects in a particular application is difficult and error-prone. This has implications for usability as the behaviour of objects gives strong cues to potential interaction. A fundamental step in tackling usability problems is the specification of virtual world objects early in the design phase. This paper presents a method for virtual object specification using task-based scenarios. Author Keywords Virtual environments, design, virtual world objects, specification, scenarios, requirements.

In recent months, research has been directed towards developing a standard for describing interactive simulation within the World Wide Web. This standard would allow the creation of virtual worlds, define their interaction and allow hyperlinking with other worlds. In effect, a three dimensional parallel to the existing Web would be described by the new standard. The 3D worlds so created would co-exist with the other documents on the Web, and interact with them in well-defined ways, thus effectively visualizing the Web. Active research has led to the development of the Virtual Reality Modeling Language (VRML), a standard which tries to accomplish the goals explained above. This is a report on a project whose goal was to design and implement a VRML browser, which would serve as a prototype for further research and development work. Keywords: Internet, World Wide Web, Virtual Reality Modeling Language, VRML browser, hyperlinks, Web browser, Open Inventor, MIME types. 1 A HTML version o...

The long title of the thesis is: 3D-visualization and neural network analysis of single subject fMRI 3D functional brain images. A single subject functional magnetic resonance imaging (fMRI) study is analyzed using a preproccessing of singular value decomposition principal component analysis and a feed forward neural network analysis, using the entropic costfunction. The analysis is a classification of brain scans into classes according to an induced paradigm: sequential finger-to-thumb opposition. The analysis is "backwarded" to construct a saliency map giving the neural networks answer to what it finds important in the brain scans to explain the paradigm. The hidden units of the neural network are given special attention, and are used to reveal non-paradigm structure in the data. An analysis strategy is presented based on second moment statistics. The analysis results has been 3D visualized. A world has been build in the description language VRML containing Talairach grid lines and l...

Databases contain vast amounts of data. Retrieving specific information from a large and complex database is not always trivial, especially for novice and non-technical users. When information from databases is made available on the Internet, typically, users will be even more unfamiliar with the database structure. Therefore, it is very important to create a user interface that `guides' the user through the database structure. It is important this query interface remains powerful while being easy to use at the same time. More experienced users should not be limited in their possibilities by the user interface.