双向身份认证的量子安全直接通信     

陈晓峰 《闽江学院学报》2014,35(5):56-59

提出一个具有双向身份认证的量子安全通信协议,协议使用单向哈希函数来验证通信双方的身份,采用单光子幺正操作来编码信息.安全性分析证明该协议能有效的抵御各种窃听和假冒攻击等,具有较好的安全性.  相似文献   

基于水电厂电气试验车的研究     

伍懿美 《中国科技纵横》2014,(20):46-47

随着供电可靠性的提高,电力设备停电检修的时间变短、而检修项目反而增多、检修质量的要求也有所提高,如何在较短的时间内高效的完成电气试验,从而判断出设备的绝缘状况就变得尤为重要。本文从实际出发,介绍了基于分布式集成技术的试验车,重点阐述了试验车的组织构架和主要技术配置。通过对目前国内电气试验车的调研研究,提出了一款既能满足水电厂又能满足变电站的电气试验的试验车。  相似文献   

开放数字信息服务体系:概念、结构与技术   总被引：16，自引：0，他引：16  

张晓林 《中国图书馆学报》2002,28(3)

开放数字信息服务体系 ,有其特定的概念、原则要求和功能框架。开放系统的开放描述基于扩展的元数据概念 ,信息系统通过开放语言和规范机制来实现对系统各层次内容的开放描述。分布服务机制源于分布对象技术 ,它将各种系统视为一个数字对象 ,对其界面、功能、数据流、传输协议等进行描述。开放体系的开放集成 ,包括横向和纵向开放集成 ,它们各有其技术线路。图 5。参考文献 2 9。  相似文献   

Distributed heterogeneous inspecting system and its middleware-based solution     

黄理灿  吴朝晖  潘云鹤 《浙江大学学报(A卷英文版)》2003,4(5):542-548

There are many cases when an organization needs to monitor the data and operations of its supervised departments, especially those departments which are not owned by this organization and are managed by their own information systems. Distributed Heterogeneous Inspecting System (DHIS) is the system an organization uses to monitor its supervised departments by inspecting their information systems. In DHIS, the inspected systems are generally distributed, heterogeneous, and constructed by different companies. DHIS has three key processes-abstracting core data sets and core operation sets, collecting these sets, and inspecting these collected sets. In this paper, we present the concept and mathematical definition of DHIS, a metadata method for solving the interoperability, a security strategy for data transferring, and a middleware-based solution of DHIS. We also describe an example of the inspecting system at WENZHOU custom. Project supported by the National Hi-Tech Development Program (863) of China (No. 2001AA111271-2) and virtual cooperation research granted by Chinese Ministry of Education  相似文献   

Using bidirectional links to improve peer-to-peer lookup performance     

JIANG Jun-jie TANG Fei-long PAN Feng WANG Wei-nong 《浙江大学学报(A卷英文版)》2006,7(6):945-951

INTRODUCTION Peer-to-peer computing has become a populardistributed computing paradigm. Efficient resourcelookup is essential for such systems. As we know, most of the deployed peer-to-peersystems are unstructured. Napster is based on a cen-tral directory and was in popular use during early daysSoon after, Gnutella and KaZaA were deployedwidely. However, all these popular unstructuredpeer-to-peer systems suffer from unscalability. Fortunately, there are new kinds of peer-to-peernetwor…  相似文献   

分布学习的教学技术   总被引：1，自引：0，他引：1  

李小林 《现代教育技术》2004,14(4):38-41

远程通信工具加上人工智能和虚拟真实技术正在使得传统的远程教育转变为一种新的教学范例,称为分布学习。分布学习源于对分布认知科学进行的研究。该文首先简要阐述了分布学习的若干概念,之后着重对构成分布学习作为新教育方式而出现的4种新的教学技术:知识网络、虚拟共同体(社会)、综合性环境和“感官沉浸”分别作了详细探讨,结语对分布学习存在的物质条件和认知理念等作了小结。  相似文献   

Timing issues in distributed testing     

HUANG Chuan-dong JIANG Fan 《浙江大学学报(A卷英文版)》2007,8(4):522-528

The objective of conformance testing is to determine whether an implementation under test (IUT) conforms to its specification. In distributed test architecture where there are multiple remote testers, the objective can be complicated by the fact that testers may encounter controllability and observability problems during the application of a test sequence. A certain amount of work has been done in the area of generating test sequence that is free from these problems. However, few researchers investigate them from the aspect of test execution. This work studies the test execution phase when test sequences are applied to the imple- mentation and it is pointed out that controllability and observability problems can be resolved if and only if the test system im- plements some timing constraints. When determining these constraints, the dynamic time information during test is taken into account, which reduces the test execution time and improves test efficiency further.  相似文献   

Broker:一种分布式系统的体系结构模式     

胡文华  杨选辉 《科技广场》2004,(10):38-40

采用Broker模式可以解决分布式系统构造的复杂性和软件开发人员需求之间的矛盾。Broker模式封装了分布式计算的组件通信机制，为开发人员提供了远程对象的透明性。今天的B／S、C／S结构甚至Web Services都是Broker模式的具体应用。  相似文献   

实时数据平台在火电厂中的应用实例     

张昕 《中国科技信息》2007,(5):151-152,155

本文介绍了实时数据平台的功能，以及在某火电厂中的具体应用，包含应用方案、主要功能和应用的实际情况等方面的内容。  相似文献   

鹤鸣观小流域不同土地利用方式的产流产沙特征   总被引：11，自引：1，他引：11  

袁再健  蔡强国  秦杰  冯明汉  李双喜 《资源科学》2006,28(1):70-74

针对日益加剧的四川紫色土地区水土流失情况，本文选取四川省南部县鹤鸣观小流域为研究区，分析了流域不同土地利用方式（荒地、灌木林、坡耕地、梯地、林地等）的产流产沙特征及其与降雨的关系以及减水减沙效益。结果表明，该流域不同土地利用方式的次降雨产流产沙特征差异显著，在各类土地利用方式中，荒地的径流系数最大，林地最小，坡耕地的侵蚀模数最大，林地最小；其径流系数与侵蚀模数与次降雨量、降雨强度有一定的相关性；水保措施起到了较好的减水减沙效果，其中林草措施减水减沙效益最好，坡改梯次之，但坡改梯能提高农业产量，经济效益较好。因此，在四川紫色土地区，宜采用生物林草措施与坡改梯相结合的水土保持措施，在坡度较陡的地方退耕还林，在缓坡地带坡改梯。本文为紫色土地区水土流失特征的研究以及水土保持措施的选定提供了一定的依据，为进一步构建小流域分布式侵蚀产沙模型奠定了基础。  相似文献