Sojourn times in a processor sharing queue with service interruptions

We study the sojourn times of customers in an M/M/1 queue with the processor sharing service discipline and a server that is subject to breakdowns. The lengths of the breakdowns have a general distribution, whereas the on-periods are exponentially distributed. A branching process approach leads to a decomposition of the sojourn time, in which the components are independent of each other and can be investigated separately. We derive the Laplace–Stieltjes transform of the sojourn-time distribution in steady state, and show that the expected sojourn time is not proportional to the service requirement. In the heavy-traffic limit, the sojourn time conditioned on the service requirement and scaled by the traffic load is shown to be exponentially distributed. The results can be used for the performance analysis of elastic traffic in communication networks, in particular, the ABR service class in ATM networks, and best-effort services in IP networks.     

基于SAML的授权和服务认证技术

由于各种安全服务系统所采用的身份验证和授权机制存在差异,这就为它们之间的信息共享带来了困难,安全声明标记语言(SAML)的出现解决了这一难题.介绍了SAML标准、SAML体系结构,设计了一种基于SAML标准的授权方案,以SAML声明为载体在服务系统间传递用户的认证和授权信息,实现异构系统的权限共享.     

信任对知识共享作用机制的文献综述

对国内外关于信任对知识共享的影响的研究进行了概括,并且提出了进一步研究的思路。     

图书馆联盟建设探讨

阐述了图书馆联盟的含义、类型、作用及意义,提出了图书馆联盟建设的策略,指出图书馆联盟是实现资源共享的重要途径。     

Quantum secret sharing between multiparty and multiparty with four states

A protocol of quantum secret sharing between multiparty and multiparty with four states was presented. It was shown that this protocol can nullify the Trojan horse attack with a multi-photon signal, the fake-signal attack with Einstein-Podolsky-Rosen pairs, the attack with single photons, and the attack with invisible photons. In addition, the upper bounds of the average success probabilities were given for dishonest agent eavesdropping encryption using the fake-signal attack with any two-particle entangled states. Supported by the National Natural Science Foundation of China (Grant No. 10671054), the Key Project of Science and Technology Research of Education Ministry of China (Grant No. 207011) and the Natural Science Foundation of Hebei Province, China (Grant Nos. A2005000140 and 07M006)     

贵重仪器设备共享工作的改革

分析了贵重仪器设备共享工作中存在的宣传不够、程序复杂、激励措施不够等问题,并针对以上问题,指出了应该加强宣传力度、简化工作流程、增强激励措施等改革方法,以上改革已在实践中取得初步成效。     

基于OBS网络的一种最少冗余包的组播树共享算法

为了减少组播树共享算法(TS-MCAST)产生冗余包,有效地利用链路网络带宽,提出了一种基于光突发交换(OBS)网络的最少冗余包的组播树共享算法(LRP-MCAST-TS)。该算法实现过程中,引入了树分割规则,将满足分割条件的组播树分割成森林,然后根据重叠大小将汇聚的组播会话划分成多个组播共享类。通过理论分析,证明了LRP-MCAST-TS算法设计的正确性,达到了减少冗余包的目的。     

浅议加强农村公共数字文化服务的意义

农村是公共文化网络的最末梢,提供公共数字文化服务,为新农村建设提供软动力,是提升国家和地区文化软实力的基础和保障。数字资源的特点使它可以轻易突破物理上的障碍,可以充分覆盖到各个地区。文化共享工程打破了地域鸿沟,保障了人民群众特别是农村地区群众的文化权益,提高了农民的信息素养和农民享受公共数字文化服务的能力。从几个方面阐述了加强农村公共数字文化服务的意义。     

On results of G. Brosch and T.C. Alzahary

We prove a uniqueness theorem for two non-constant meromorphic functions sharing three values which improves a recent result of T.C. Alzahary. As a consequence of our main result we also improve a theorem of G. Brosch.     

加入ＷＴＯ与完善我国商业秘密的法律保护制度

中国即将加入ＷＴＯ，然而，商业秘密的侵权、犯罪案件却时有发生，且有上升态势，其与ＷＴＯ多边协议、规则背道而驰。为有效地遏制其侵权、犯罪行为，必须采取有力措施，加强法律监督，加大打击力度，完善我国商业秘密的法律保护制度。