（2，2）贝叶斯理性秘密共享方案

在理性秘密共享协议中,自利性目标可能会驱使理性参与者偏离协议,从而影响协议的公平性。在（t, n）门限理性秘密共享方案中,其特殊情形（2,2）理性秘密共享方案的公平性较难实现。在同时考虑理性参与者的眼前利益和长远利益的基础上,基于不完全信息动态博弈模型,通过分析理性参与者在（2,2）秘密重构阶段可能采取的策略和信念系统,引入理性参与者的期望收益,研究了（2,2）理性秘密共享重构阶段的完美贝叶斯均衡问题。进一步结合机制设计理论中的VCG（Vickrey-Clarke-Groves）机制,设计激励相容的交互记录机制来约束理性参与者的行为,在不需要秘密分发者保持在线的情形下,提出一个适用于异步通信的公平的（2,2）理性秘密共享方案。     

Deterministic Time-Varying Packet Fair Queueing for Integrated Services Networks

In integrated services networks, the provision of Quality of Service (QoS) guarantees depends critically upon the scheduling algorithm employed at the network layer. In this work we review fundamental results on scheduling, and we focus on Packet Fair Queueing (PFQ) algorithms, which have been proposed for QoS wireline-wireless networking. The basic notion in PFQ is that the bandwidth allocated to a session is proportional to a positive weight _i . Because of the fixed weight assignment, the inherent in PFQ delay-bandwidth coupling imposes limitations on the range of QoS that can be supported. We develop PFQ with deterministic time-varying weight assignments, and we propose a low-overhead algorithm capable of supporting arbitrary piecewise linear service curves which achieve delay-bandwidth decoupling. Unlike existing service-curve based algorithms, our time-varying PFQ scheme does not exhibit the punishment phenomenon, and allows sessions to exploit the extra bandwidth in under-loaded networks.     

基于图像分存的离散小波数据隐藏算法

数字图像分存技术将一幅秘密图像分解成几幅无意义或者杂乱无章的图像进行存储或传输,获得其中部分分存信息就能恢复出原始图像信息,以便增加图像信息的安全性.文中提出了一种基于图像分存和离散小波变换的的信息隐藏算法.首先利用置乱变换对传输图像进行加密,再将置乱后的隐秘信息分成N份,然后将隐秘信息随机嵌入到图像的小波分解系数中,...     

基于UML的分布式服务合约库系统建模

由于服务的分布与协作特性,有必要在服务合约库系统间进行协作.然而,目前的大多数服务合约库系统都遵循自己的服务合约标准和服务合约分类标准.针对这种状况,本文提出了一个用于对分布式服务合约库系统进行建模的元模型.首先,本文描述了一个大多数服务合约库系统所遵循的功能模型,然后基于此从服务合约库系统的结构和互连体系这两方面详细地阐述了这个元模型,并在UML2.0中进行了扩展,形成一个UML外廓.本文进一步地阐述了利用该外廓对青鸟分布式服务合约库系统所建立的模型.     

基于SSH+Ajax的校园文档资源共享平台设计

针对大学校园文档资源统一管理、交互共享等问题,提出采用SSH框架与Ajax技术,设计交互共享、开放式校园文档资源管理平台。完成平台文档模块接口与类以及平台数据库设计,支持多种格式文档的快速搜索、浏览、上传、下载。实验表明,使用SSH框架可提高文档共享平台的可靠性与复用性,使用Ajax技术提高了资源的共享效率。该平台可有效解决校园文档信息孤岛问题,为高校教学资源的开放共享提供了良好的管理手段。     

矢量空间秘密共享群签名方案

本文通过引入矢量空间秘密共享技术和阈下通道技术,提出了一种新的群签名方案.在本签字体制建立后,可以加入或删除成员.一个部门只有在一定数量成员的参与下,才可以生成有效的群签名.接收者可以验证签名的有效性,但是不能判断出群签名出自哪一个部门.当有争端发生时,仲裁者可以"打开"群签名,确定签名的部门.此签字的公钥长度是独立的."打开"过程通过阈下通道实现.     

网格技术研究与发展趋势综述

简要介绍了网格以及网格计算的概念,阐述了网格技术的国内外研究现状及其应用,并讨论分析了网格技术研究中存在的问题,展望了网格技术的发展趋势.     

Survivable Load Sharing Protocols: A Simulation Study

The development of robust, survivable wireless access networks requires that the performance of network architectures and protocols be studied under normal as well as faulty conditions where consideration is given to faults occurring within the network as well as within the physical environment. User location, mobility, and usage patterns and the quality of the received radio signal are impacted by terrain, man-made structures, population distribution, and the existing transportation system. The work presented herein has two thrusts. One, we propose the use of overlapping coverage areas and dynamic load balancing as a means to increase network survivability by providing mobiles with multiple access points to the fixed infrastructure. Two, we describe our simulation approach to survivability analysis which combines empirical spatial information, network models, and fault models for more realistic analysis of real service areas. We use our simulation approach to compare the survivability of our load balancing protocols to a reference scheme within two diverse geographic regions. We view survivability as a cost-performance tradeoff using handover activity as a cost metric and blocking probabilities as performance metrics. Our results illustrate this tradeoff for the protocols studied and demonstrate the extent to which the physical environment and faults therein affect the conclusions that are drawn.     

Integrated photo-rechargeable supercapacitors formed via electrode sharing

Herein, we report integrated photo-rechargeable supercapacitors (IPSs) composed of the inverted organic solar cell (iOSC) and solid-state supercapacitor (SC), enabling a high-performance self-power pack. The iOSC serves as a self-power source while the SC functions as energy storage, and both share an indium-tin-oxide (ITO) electrode that affords improved charge propagation across the devices. Combining the energy harvesting and storage devices in this way significantly alleviates the limitations of each device. The power fluctuation of the iOSC can be reimbursed by the SC, thus allowing for a stable energy output. Moreover, the SC is frequently charged by the iOSC during the daytime, thereby greatly reducing the charging time and avoiding a complete discharge as well. When the SC of the IPS is charged by the iOSC under AM 1.5 G of illumination, the overall energy conversion-storage efficiency is ca. 2.27%. Our work provides an effective strategy for further study to fabricate a small, lightweight, portable/wearable self-power pack by integrating energy harvesting and energy storage devices into a single structure.     

基于中国剩余定理的门限RSA签名方案的改进

针对基于中国剩余定理的门限RSA签名方案无法签署某些消息,以及部分签名合成阶段运算量大的问题,论文提出一种基于虚拟群成员的改进方法,使得改进后的方案能够签署所有消息,同时能够极大地减少部分签名合成阶段的运算量,当门限值为10时,可以将部分签名合成阶段的运算量减少为原来的1/6。对改进方案进行了详细的安全性和实用性分析。结果表明,改进方案在适应性选择消息攻击下是不可伪造的,且其运算效率较其他门限RSA签名方案更高。