网络通讯中信息安全性分析

确保网络通讯中信息安全的主要技术是加密技术。在论述了信息加密技术的基础上,进一步分析了加密技术在网络通讯中的应用,最后介绍了网络信息加密技术的发展方向。     

Factors Associated with Use of Interactive Cancer Communication System: An Application of the Comprehensive Model of Information Seeking

In order to provide insights about cancer patients' online information seeking behaviors, the present study analyzes individuals' transaction log data and reports on how demographics, disease‐related factors, and psychosocial needs predict patterns of service use within a particular Interactive Cancer Communication System (ICCS). Study sample included 294 recently diagnosed breast cancer patients. Data included pretest survey scores of demographic, disease‐related, and psychosocial factors and automatically collected ICCS use data over the 4‐month intervention. Statistical analyses correlated pre‐test survey scores with subsequent, specific types of ICCS service usage. Patterns of online cancer information seeking differed according to the patients' characteristics, suggesting that lower income, less educated women and those lacking in information‐seeking competence use the computer and online services to the same or a greater degree if those services are made available to them. Results of this study can inform more effective resource development for future eHealth applications.     

Activity Awareness as an Enabler for Communication and Network Building in Construction Design Teams

The paper reports on ongoing research into the facilitation of communication in distributed design teams of the type typically encountered in the construction sector. Ideas around social aspects in such design teams are discussed followed by our previous research efforts as an evolutionary process that has led us to develop in this direction. It is argued that facilitating timely and contextually grounded communication in a distributed environment can help to build the social networks and associated social capital common in collocated design teams but often absent in distributed ones. We describe our framework for providing such facilitation through monitoring and awareness of the information “space” of a construction project. We believe that by leveraging the relationships in the information space, we can go some way to identifying those individuals who would benefit from developing interpersonal relations in their work and further by exploiting those relationships in real time we can accelerate the formation of personal social networks and social capital between those individuals.     

基于双机通讯的碎纸机技术改进

针对当前碎纸机存在的成本较高、连线复杂等问题,采用基于自定义通讯协议的方案进行改进。大量生产实践证明,此方案行之有效,取得良好的经济效益。     

通信机房用精确下送风空调系统

介绍了精确下送风空调系统的原理和系统组成，并对某采用精确下送风空调系统的通信机房的能源利用效率进行测试分析，实测结果表明：该通信机房的能源利用效率达到1．54，比某大型通信集团广东公司通信机楼的平均值优23．0％，节能效果明显。     

老医院交通系统的修复和搭建——以鄂尔多斯市中心医院加建医院街工程为例

本文以综合医院交通系统与医院功能流线系统研究理论为基础,结合"医院街"设计理念,具体阐述医院交通系统与功能流线混乱问题的解决方案.     

Efficient Algorithms for Block-Cyclic Redistribution of Arrays

The block-cyclic data distribution is commonly used to organize array elements over the processors of a coarse-grained distributed memory parallel computer. In many scientific applications, the data layout must be reorganized at run-time in order to enhance locality and reduce remote memory access overheads. In this paper we present a general framework for developing array redistribution algorithms. Using this framework, we have developed efficient algorithms that redistribute an array from one block-cyclic layout to another. Block-cyclic redistribution consists of index set computation , wherein the destination locations for individual data blocks are calculated, and data communication , wherein these blocks are exchanged between processors. The framework treats both these operations in a uniform and integrated way. We have developed efficient and distributed algorithms for index set computation that do not require any interprocessor communication. To perform data communication in a conflict-free manner, we have developed direct indirect and hybrid algorithms. In the direct algorithm, a data block is transferred directly to its destination processor. In an indirect algorithm, data blocks are moved from source to destination processors through intermediate relay processors. The hybrid algorithm is a combination of the direct and indirect algorithms. Our framework is based on a generalized circulant matrix formalism of the redistribution problem and a general purpose distributed memory model of the parallel machine. Our algorithms sustain excellent performance over a wide range of problem and machine parameters. We have implemented our algorithms using MPI, to allow for easy portability across different HPC platforms. Experimental results on the IBM SP-2 and the Cray T3D show superior performance over previous approaches. When the block size of the cyclic data layout changes by a factor of K , the redistribution can be performed in O( log K) communication steps. This is true even when K is a prime number. In contrast, previous approaches take O(K) communication steps for redistribution. Our framework can be used for developing scalable redistribution libraries, for efficiently implementing parallelizing compiler directives, and for developing parallel algorithms for various applications. Redistribution algorithms are especially useful in signal processing applications, where the data access patterns change significantly between computational phases. They are also necessary in linear algebra programs, to perform matrix transpose operations. Received June 1, 1997; revised March 10, 1998.     

一个自适应的支持资源预定的路由算法

新型的应用问题，如视屏会议、分布式模拟等需要保障质量，资源豫剧 定协议如ＲＳＶＰ等可以用来提供有保障的服务质量，介它需要有新的路由协议。为此，文中提供一种自适应的、支持资源预定的、多点通讯的路由算法，并描述了该算法的特性。     

论网络环境下采访信息交流的障碍及其克服

阐述网络环境下的采访信息交流特点和作用，并对其障碍的产生和现象进行分析、描述，最后提出如何克服这些障碍。     

地电位升高对通信设备的影响及其防护

针对电力通信系统运行特点，着重对电力系统接地故障引起的地电位升高及其对通信设备的影响进行了分析，提出了相应的保护措施，并介绍了两种保护装置。