关于Gundersen问题的若干结果

对Gundersen问题“设非常数整函数f(z)与g(z)有三个判别的IM分担值.那么 这三个值是否皆为f(z)与g(z)的CM分担值?”,作者进行了研究,得到若干结果,部 分解决了该问题.     

An efficient quantum secret sharing protocol with orthogonal product states

An efficient quantum secret sharing protocol with orthogonal product states in the 33 Hilbert space is presented. The particles in the orthogonal product states form two particle sequences. One sequence is sent to Bob and the other is sent to Charlie after rearranging the particle orders. With the help of Alice, Bob and Charlie make the corresponding local measurement to obtain the information of the or- thogonal product states prepared. This protocol has many distinct features such as great capacity and high efficiency.     

基于IP网络的动态部分缓冲共享方案

本文基于IP网络提出了一种分组丢弃控制方案——动态部分缓冲共享.和已有的静态部分缓冲共享方案相比,新方案根据分组丢弃行为对控制阈值进行动态调整,从而对网络流量的变化具有更优的适应性.同时新方案也避免了复杂的阈值设置问题,任意设定的初始阈值都不会影响系统稳态性能.实验结果显示,新方案可以保证稳定的相对丢失率性能,并且在相同的流量条件下比原有方案具有更低的抖动延迟.     

固态雷达发射机多路电源的并联均流设计

大功率电源系统的发展趋势是实现电源组件模块化,再通过多个模块的并联以满足负载功率的要求。模块化电源的并联运行是扩大电源系统容量和提高固态雷达发射机可靠性的重要手段,要实现电源模块并联运行的可靠性,各电源模块应具有良好的均流特性。文中通过对不同并联方法的分析比较,介绍了最大电流法自动均流控制电路的工作原理及设计,并由试验给出均流效果。     

多线程设计中的克隆技术

多线程中的数据共享是一个重要研究课题,现给出了多线程之间处理数据的新模式,该模式的核心是：通过克隆线程的目标对象,使得多线程具有相同结构的目标对象却不共享目标对象的数据,这种新模式增强了利用多线程解决实际问题的能力。     

一种新的移动Ad Hoc网络门限式密钥共享认证方案

门限式密钥共享认证已成为目前MANET的分布式认证技术的热点所在。深入分析了当前主流的几种门限式密钥共享认证方案，通过分析比较各自的优劣特性，得出了一种全新的认证体系。新的方案不仅弥补了原有方案的不完全分布式特性，更通过周期性密钥更新进一步提高了系统安全性。仿真结果表明，该方案具有高效率的性能和较高的安全级别，并具有良好的可扩展性。     

ECCE: Enhanced cooperative channel establishment for secure pair-wise communication in wireless sensor networks

This paper presents the ECCE protocol, a new distributed, probabilistic, cooperative protocol to establish a secure pair-wise communication channel between any pair of sensors in a wireless sensor network (WSN). The main contributions of the ECCE protocol are: to allow the set-up of a secure channel between two sensors (principals) that do not share any pre-deployed key. This feature is obtained involving a set of sensors (cooperators) in the channel establishment protocol; to provide probabilistic authentication of the principals as well as the cooperators. In particular, the probability for the attacker to break authentication check decreases exponentially with the number of cooperators involved; to trade off the memory space required to store the pre-deployed encryption keys with the number of cooperators involved in the protocol. Hence, memory storage can be used to store keys built with the ECCE protocol, which helps amortizing the (limited) overhead incurred in the ECCE key set-up; to be adaptive to the level of threat the WSN is subject to. We provide analytical analysis and extensive simulations of ECCE, which show that the proposed solution increases both the probability of a secure channel set-up and the probability of channel resilience with respect to other protocols.     

应用于并行直流转换电源的均流控制芯片设计

为实现并行直流转换电源系统中转换器电流的均衡分布,降低转换器承受的电、热应力,提高系统可靠性,给出一种采用自动主从控制策略的均流方案,并给出了方案实现的关键部件--均流控制芯片的设计.设计中采用电流反馈环路对输出电压进行调整,降低了PCB板级寄生效应对调整信号的影响;并提出一种启动控制电路用以改善系统的启动时序,加速了启动阶段的电流均衡过程.芯片采用1.5μm BCD(Bipolar-CMOS-DMOS)工艺设计实现,面积为3.6mm2.应用该芯片构成了一个由两个直流转换器组成,具有12V/3A输出能力的并行电源系统.测试结果表明,该并行电源系统满负载时均流误差小于1%.     

基于TTL约束洪泛算法的文件搜索性能改进方法

研究了在没有分布式索引结构的非结构化P2P网络中如何改进搜索效率。找出KaZaA及Gnutella中影响性能的问题,由此提出了解决方法,并重点提出了一个基于票据的搜索算法以减少过量的搜索负载。     

Adaptive Information Sharing with Ontological Relevance Computation for Decentralized Self-Organization Systems

Decentralization is a peculiar characteristic of self-organizing systems such as swarm intelligence systems, which function as complex collective responsive systems without central control and operates based on contextual local coordination among relatively simple individual systems. The decentralized particularity of self-organizing systems lies in their capacity to spontaneously respond to accommodate environmental changes in a cooperative manner without external control. However, if members cannot obtain observations of the state of the whole team and environment, they have to share their knowledge and policies with each other through communication in order to adapt to the environment appropriately. In this paper, we propose an information sharing mechanism as an independent decision phase to improve individual members’ joint adaption to the world to fulfill an optimal self-organization in general. We design the information sharing decision analogous to human information sharing mechanisms. In this case, information can be shared among individual members by evaluating the semantic relationship of information based on ontology graph and their local knowledge. That is, if individual member collects more relevant information, the information will be used to update its local knowledge and improve sharing relevant information by measuring the ontological relevance. This will enable more related information to be acquired so that their models will be reinforced for more precise information sharing. Our simulations and experimental results show that this design can share information efficiently to achieve optimal adaptive self-organizing systems.