基于HLA的分布式虚拟维修仿真研究

利用虚拟现实技术仿真维修工作逐步成为维修工程领域一个重要研究手段，针对维修活动中存在协同交互工作的需要，本文以进行虚拟维修活动作为仿真平台，结合高层仿真技术HLA的基础框架，探讨开发分布式虚拟维修仿真系统，目的为提高维修活动仿真的控制性和灵活性以及便于各种分析评价工作的开展。阐述了分布式交互仿真技术和虚拟维修仿真，对分布式虚拟维修仿真平台框架、仿真对象模型和系统数据管理进行了分析。     

On exploiting propagation delays for passive target localization using bearings-only measurements

For many cases, target localization accuracy can significantly improve by accounting for the propagation delay between the target source and the sensors. This paper considers when it is advantageous to compensate for the propagation delay for the case of a network of nodes where each node consists of an array of sensors. Each node calculates a direction of arrival (DOA) from the raw data, and these DOAs are combined to localize the target. First, we consider the case when no prior data are given and the localization occurs using DOA measurements from a single snapshot. Such localization methods are necessary to initiate a target track. Finally, we investigate the case where an extended Kalman filter is used to aggregate measurements over multiple snapshots.     

无线宽带应用中的中间件技术

为在无线宽带应用中实现异构连接和分布式应用,开发商提供了带有标准编程接口和标准协议的分布式系统服务,实现这些服务的技术称为中间件技术。中间件技术屏蔽了底层分布式环境的复杂性和异构性,简化了分布式应用程序的开发,使分布式应用程序的健壮性,可扩充性,可用性更好。在对无线宽带介绍和中间件概述基础上,讨论了中间件技术在无线宽带中的应用,最后对无线宽带应用和中间件技术进行了展望。     

基于分布式光纤的特高混凝土拱坝导热系数反演分析

反演分析是主要利用监测资料的正分析成果,应用数学方法反求大坝及其基础的热力学参数,可以评价计算模型和结果的精度,从而提高计算成果的准确性。基于分布式光纤的测温优势,结合西南某施工期特高拱坝河床坝段,通过在其特殊浇筑仓距表层下60cm内不同深度处埋设分布式光纤测温,并对其测温结果分别取平均值,从而反求大坝混凝土导热系数。计算结果表明,比大坝设计初期拟定值略高,符合实际情况,其结果更加真实可靠。     

Oracle9i高级复制在综合网管中的应用研究

综合网管系统是典型的颁布式应用.一个大型的综合网管系统通常要管理地理空间上非常分散的子网管系统.这些系统通常需要共享数据.Oracle91的高级复制技术基于颁布式数据库,在组成颁布式数据库系统的多个数据库复制节点之间维护和更新数据对象.本文采用Oracle91的高级复制技术同步各个子网管系统之间的数据,保证各个子网管系统之间数据的一致性.     

Distributed leadership in practice in Finnish schools

The aim of this study is to explore what aspects the principals and the members of the management teams in the primary and upper secondary education schools in Vantaa support distributed leadership in their school and how necessary they see that distributed leadership is extended to the students in matters concerning the curriculum and the development of teaching practices. The research method was a survey based on a questionnaire of 48 questions, where the respondents evaluated the preconditions of distributed leadership in their school. The principals and members of the management teams in the primary and upper secondary schools in Vantaa see distributed leadership mostly as delegation of predetermined tasks than the interaction among leaders, followers and situations. The results strengthen the view of distributed leadership as a phenomenon which in its primitive form can be seen in the official structures of the school and as delegation based on a formal position in the more advanced view distributed leadership can be seen as interaction among the management team and in the situations in the official and unofficial structures of the school.     

Exploring Multiplexity: Social Network Structures in a Computer-Supported Distance Learning Class

A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.     

火电厂DCS系统中抗干扰技术的应斥

随着电力工业的迅速发展和热工自动化水平的提高,分散控制系统（DCS）已在国内各电厂中得到广泛应用,在DCS系统的应用中电磁干扰是危害其安全性、可靠性的重要因素。本文从安装调试的角度,概括性的介绍了DCS系统接地和屏蔽层的接地方法,并指出了其设计、安装、调试过程中应注意的问题和解决方法。     

医学信息资源管理与服务平台的研究与实现

采用元数据管理理念,研究了如何有效地对医学信息资源进行管理。同时在平台开发中,灵活运用分布式服务模式,方便医学工作者及科研人员便捷获取医学信息资源。最后,运用混合推荐算法,实现了医学信息资源的自动推荐,帮助医学工作者及科研人员更有效地发现自己所需的医学信息资源。     

一种基于Web Services的分布式工作流系统

WebServices作为一种面向服务的体系架构,其突出优点是实现了真正意义上的平台独立性和语言独立性.基于此可以构件一种完全分布的工作流模型,以满足现代企业信息管理分布性、自治性和异构性的要求.并讨论了具体实现中的相关问题.