Distributed heterogeneous inspecting system and its middleware-based solution

INTRODUCTIONInspectingserviceiswidelyusedbyanorga nizationtoinspecttheoperationsanddataofitssuperviseddepartments ,especiallythosedepart mentswhicharenotownedbythisorganization .Therearemanysystemswhichhaveinspect ingservices,suchasEnterpriseResourcePlan …     

Control DHT maintenance costs with session heterogeneity

The maintaining overheads of Distributed Hash Table (DHT) topology have recently received considerable attention.This paper presents a novel SHT (Session Heterogeneity Topology) model, in which DHT is reconstructed with session heterogeneity. SHT clusters nodes by means of session heterogeneity among nodes and selects the stable nodes as the participants of DHT. With an evolving process, this model gradually makes DHT stable and reliable. Therefore the high maintaining overheads for DHT are effectively controlled. Simulation with real traces of session distribution showed that the maintaining overheads are reduced dramatically and that the data availability is greatly improved.     

Computing and the social organization of academic work

This article discusses the academic computing movement during the 1980s. We focus on the Faculty Workstations Project at Brown University, where major computing initiatives were undertaken during the 1980s. Six departments are compared: chemistry, cognitive and linguistic sciences, geology, music, neural science, and sociology. We discuss the theoretical implications of our study for conceptualizing the relationship of computing to academic work.An early version of this article was originally published as: Technological Innovation in Higher Education: A Case Study in Academic Computing. In Morell, J. and Fleischer, M. (Eds.), (1991),Advances in the Implementation and Impact of Computer Systems, Vol. 1, JAI Press, Greenwich, Connecticut, pp. 183–209.     

基于Linux集群的并行计算

简要论述了并行计算机体系结构、并行计算原理，并介绍了Linux集群并行计算平台的建立以及在此平台下的单一系统映像SSI和并行编译环境MPI．     

基于ADO.NET的海洋经济生物MIS系统

本文阐述了海洋经济生物管理多媒体信息系统的需求分析、软件结构、网络结构等.系统在研发过程中采用了最新的.NET技术,构建了一个多层、安全、可伸缩、高效的分布式应用系统.着重分析和研究了Web页面连接数据库的ADO.NET和多媒体数据处理等关键技术.系统采用了C/S和B/S相结合的体系结构,增强了系统的安全性和灵活性,为数字化海洋提供了可借鉴的解决方案.     

The Same but Different – How to Introduce Variation within Computing Assessment Tasks

In this article, suggestions are made for introducing an individual element into formative assessment of the ability to use computer software for statistics.     

Distributed media cooperation for enhanced video communication

INTRODUCTION According to yearly statistics the demand for multimedia traffic over computer networks is con- stantly on the increase (Nielsen//NetRatings, http:// www.nielsen-netratings.com/). Therefore, it is inevi- table that situations where different media streams will need to share communication resources will be- come commonplace. In such cases, it would be of interest to optimize the overall performance of the network. In other words, resources should be allo- cated across the com…     

基于粗糙集的分布式信息检索

在分布式数据库技术和模糊集理论的基础上,应用作为数据挖掘的新方法的 Rough集理论,针对分布式数据库的复杂查询处理问题,构建一种基于 Rough 集的分布式数据库系统,设计出Rough集上的查询算法,降低了信息查询的时间复杂性,提高了信息查准率,兼顾了查全率,为信息查询和科技查询提供决策支持。     

CSCL环境中的社会交互

现在有很多关于计算机支持下协作学习(CSCL)异步环境中分布式学习团体(DLGs)的实证研究。研究表明当前的CSCL环境并不能完全满足人们对其支持交互的团体学习、知识共享、知识的社会建构及能力的培养的需要。在CSCL环境中,主要有两个因素阻碍我们取得预期的社会交互的成果:一是将社会交互看作是自然而然发生的,二是忽视与学习任务本身无关的社会心理交互。当前解决这个问题的办法主要是依靠教育者和教师鼓励协作学习,为了让教师从这样的负担中解脱出来,我们必须改进CSCL环境,激发和支持学习者的社会交互。     

校园计算网格模型研究及网格管理系统的实现

网格计算技术是近年才发展起来的一门新技术。本文以大学校园硬件资源为背景,设计了校园计算网格模型,开发了UCGrid管理系统。UC- Grid管理系统能有效管理网格资源,为用户提供安全、可靠的计算服务。通过网格用户控制台,用户可方便地向网格提交单一计算任务作业和并行计算任务作业,监测作业运行状态,实现磁盘共享和远程打印。网格系统控制台实现了作业管理、用户管理和分布式数据I/O,通过采用用户证书集中管理方式,为网格资源的有偿使用奠定了基础。