Odyssey: a high‐performance clustered video server

Video servers are essential in video‐on‐demand and other multimedia applications. In this paper, we present our high‐performance clustered CBR video server, Odyssey. Odyssey is a server connecting PCs with switched Ethernet. It provides efficient support for normal play and interactive browsing functions such as fast‐forward and fast‐backward. We designed a set of algorithms for scheduling, synchronization and admission control, which results in a high utilization of resources. Odyssey is able to deliver a large number of video streams. Copyright © 2003 John Wiley & Sons, Ltd.     

模糊需求和模糊能力约束的集约生产计划

通过对模糊需求量和模糊等式及模糊需求环境下生产-库存平衡方程两种等价的描述方法的基础上,建立了具有模糊需求量和模糊能力约束集约生产计划问题的最佳平衡模型(BAPP)、交互式集约计划模型(IAPP)和交互式求解方法.     

A Multi-User 3-D Virtual Environment with Interactive Collaboration and Shared Whiteboard Technologies

A multi-user 3-D virtual environment allows remote participants to have a transparent communication as if they are communicating face-to-face. The sense of presence in such an environment can be established by representing each participant with a vivid human-like character called an avatar. We review several immersive technologies, including directional sound, eye gaze, hand gestures, lip synchronization and facial expressions, that facilitates multimodal interaction among participants in the virtual environment using speech processing and animation techniques. Interactive collaboration can be further encouraged with the ability to share and manipulate 3-D objects in the virtual environment. A shared whiteboard makes it easy for participants in the virtual environment to convey their ideas graphically. We survey various kinds of capture devices used for providing the input for the shared whiteboard. Efficient storage of the whiteboard session and precise archival at a later time bring up interesting research topics in information retrieval.     

3DS模型在虚拟现实几何建模中的应用

几何建模是开发虚拟现实系统过程中最基本，最重要的工作之一，该文采用了3DS模型文件作为虚拟环境中几何模型的主要存储格式，并且从理论上、实际应用方法以及试验仿真结果几个方面分析了该方法的可行性，通用性，说明了在要求不高的条件下，采用3DS模型和相关的三维建模软件进行虚拟现实研究工作是一条现实的途径。     

基于多智能体系统的面向对象本体研究

智能体间的信息交互和行为协调是共同完成被委托任务的必要条件,论文提出了在多智能体系统中智能体本身必须建立领域模型的技术要求,即用本体支持运行时的语义交互。为此,文中用面向对象的知识表示方法描述并建立本体,并以此为基础形成领域操作代数系统和智能体服务描述语言。结合开放购买的仿真案例,表明在一个完整的情景语义交互中,服务提供方需要以智能体服务描述语言表述自己提供服务的方法和过程,而接受服务方必须在理解智能体服务描述语言的基础上,获取某一具体服务。     

协同工作软件系统结构的研究和实现

设计和实现了一个CSCW(Computer Supported Cooperative Work)软件系统，该系统结构的核心思想体现在以下3方面：首先是可实现跨平台的协作，其次是可以同时支持同步协作与异步协作，最后是它支持多会议功能，即一个用户可同时处于若干会议中，并提出了一种利用客户端浏览器插件(Plug-in)来协调客户、客户和服务器以及客户和客户之间的通信机制，以此软件系统为平台实现了一个实例一一远程交互式考核系统ITS(Interactive Testing System)。在ITS中尝试性地提出了一种新型的远程交互式考核模式，并实现了交互式的远程学生考试与教师阅卷过程，同时支持同步协作与异步协作方式，满足了远程教育用户在地域分布、平台各异的情况下的同步与异步的交流要求。     

系统仿真技术及其新进展

本文在描述系统仿真技术的定义、分类、过程、应用范围及其主要研究内容的基础上,介绍了近年来系统仿真技术的发展及新动向.     

一种交互式新的倒圆角算法

介绍了一种交互式倒圆角的算法，该算法克服了以往的被动式倒圆角算法的缺陷，在新的交互式算法中对于选点和确定圆弧走向作了进一步的改进，并在实际应用中获得了成功。     

A Functional Rephrasing of the Assumption/Commitment Specification Style

The assumption/commitment (also called rely/guarantee) style has been advocated for the specification of interactive components of distributed systems. It suggests the structuring of specifications into assumptions about the behavior of the component's environment and into commitments that are fulfilled by the component, provided the environment fulfills these assumptions. One of its motivations is to achieve modularity (also called compositionality) for state transition specifications of system components. Another reason for writing specifications in this format lies in proof rules that refer to this format. We define the assumption/commitment formats for functional system specifications. In particular, we work out a canonical decomposition of system specifications following the assumption/commitment format into safety and liveness aspects. We demonstrate the format of assumption/commitment specifications by a number of examples. Finally, we discuss the methodological significance of the assumption/commitment format in the stepwise development of specifications.     

人机交互系统软件设计

本文在计算机用户分类模型的基础上,提出了设计人权交互系统的七项基本原则,并以“计算机导购系统”作为上述设计原则的载体与综合运用的对象。充分体现出这个人性化、智能化的人机交互界面“一看就懂、一用就会”的特点。