Study on a Wide-Area Collaborative Virtual Environment Based on Wireless Mobile Communication Technologies

几乎所有的分布式虚拟环境都是在高速有线网络上实现的。在本研究中，我们探索了一种在无线移动网络上实现dve的新方法。我们设计并开发了一套基本功能，以实现固定传输延迟无线网络上的分布式交换机。在此基础上，实现了远程用户在网络上协同创建各种三维模型的协同三维建模系统。本研究产生了以下结果：1。设计了无线网络的DVE体系结构。它定义了一种新的协议，使各参与主机能够自主控制更新信息的传输和可视化，从而实现无线网络上的分布式交换机。发明了一种基于功能表示的三维数据共享方法，实现了海量三维数据在网络上远程系统之间的传输和共享，并为基于功能三维模型表示的共享数据提供了递进和差值传输策略等增强功能。开发了基于交互进化计算（IEC）的协同设计系统。它允许远程用户协作创建新的3D形状。该系统利用IEC框架，帮助用户方便地将未定型的图像外化到具体的三维模型中。针对城市规划、土木工程工作管理、烟花动画制作等应用系统，对以上三个功能进行综合评价。这些结果发表在IEEE/ACM会议论文和IPSJ/IEICE期刊论文上。我们还为其中的一部分申请了专利。

Almost all distributed virtual environments (DVEs) have been implemented on high-speed wired network. In this study, we have explored a new approach to realize DVEs on wireless mobile network. We designed and developed a set of elemental functions to realize DVEs on the wireless network with fixed transmission delays. Then, a collaborative 3D modeling system allowing remote users to cooperatively create various 3D models on the network is implemented based on the basic functions. This study has produced the following results :1. The DVE architecture for wireless network is designed. It defines a new protocol for each participating host to autonomously control transmission and visualization of update information to realize DVEs on the wireless network.2. The 3D data sharing method based on functional representation to enable transmission and sharing of huge 3D data between remote systems on the network is invented It provides some enhanced functions such as progressive and difference value transmission strategies for the shared data based on the functional 3D model representation.3. The Collaborative design system using interactive evolutionary computation (IEC) is developed. It allows the remote users to collaboratively create new 3D shapes. The system assists the users to easily externalize their unshaped images to some concrete 3D models by employing the IEC framework.4. The application systems aimed at urban planning, civil engineering work management, and production of fireworks animation are implemented to comprehensively evaluate the above three functions.These results are published in IEEE/ACM conference papers and IPSJ/IEICE journal papers. We also apply for a patent about a part of them.