认证群密钥协商协议的安全性分析与改进

对Tseng协议构造了一种有效的中间人伪造攻击,敌手可以成功获得群会话密钥,因此Tseng协议不满足密钥认证性。然后基于Tseng协议的安全缺陷,提出改进协议,并进行安全性分析和性能分析。改进协议实现了通信节点之间的双向认证,不但满足前向安全性、密钥认证性,还能有效抵抗被动攻击和中间人伪造攻击。改进协议中的低能量节点计算出会话密钥的时间只需2.03s,高能量节点的计算时间仅为原协议的1/2,并且通信开销减小了40%,更适用于能量受限,带宽受限的移动通信系统。     

2001—2008年中国非物质文化遗产研究综述

在历史的描述中去勾勒和阐述亦是学术综述写作的一种方式,而且这种基于历史的写作方式,可能更忠于事实。在对2001—2008年中国非物质文化遗产重要事件进行梳理和年度研究情况分析后,关于非物质文化遗产研究的下一步发展趋势和要解决的重点问题,一是要结合中国和世界关于非物质文化遗产的现状和实际需要进行研究;二是要深化非物质文化遗产的内在学理研究;三是要贴近民间非物质文化遗产保护和传承的实际需求与实践要求进行理论先行式研究。     

Over‐the‐Counter Markets

We study how intermediation and asset prices in over‐the‐counter markets are affected by illiquidity associated with search and bargaining. We compute explicitly the prices at which investors trade with each other, as well as marketmakers' bid and ask prices, in a dynamic model with strategic agents. Bid–ask spreads are lower if investors can more easily find other investors or have easier access to multiple marketmakers. With a monopolistic marketmaker, bid–ask spreads are higher if investors have easier access to the marketmaker. We characterize endogenous search and welfare, and discuss empirical implications.     

Money in Search Equilibrium,in Competitive Equilibrium,and in Competitive Search Equilibrium

We compare three market structures for monetary economies: bargaining (search equilibrium); price taking (competitive equilibrium); and price posting (competitive search equilibrium). We also extend work on the microfoundations of money by allowing a general matching technology and entry. We study how equilibrium and the effects of policy depend on market structure. Under bargaining, trade and entry are both inefficient, and inflation implies first‐order welfare losses. Under price taking, the Friedman rule solves the first inefficiency but not the second, and inflation may actually improve welfare. Under posting, the Friedman rule yields the first best, and inflation implies second‐order welfare losses.     

Assortative Matching with Explicit Search Costs

In this paper, I analyze a decentralized search and matching economy with transferable utility composed of heterogeneous agents. I explore whether Becker's assortative matching result generalizes to an economy where agents engage in costly search. In an economy with explicit additive search costs, complementarities in joint production (supermodularity of the joint production function) lead to assortative matching. This is in contrast to previous literature, which had shown that in a search economy with discounting, assortative matching may fail even when the joint production function is supermodular.     

目录与教学、科研和科技开发

本文认为目录学不仅是读书治学的入门之学 ,而且是科学研究的指南。在信息时代“目录”对高新技术的引进和开发有着极其重大的指导意义 ,应重视和鼓励当代科学工作者学习目录学     

开放定址法等概率查找不成功计算研究

讨论了在Hash查找中,用开放定址法解决冲突,在等概率查找下查找不成功的计算问题.给出了计算方法、实例和计算程序.其理论意义是对响应的问题给出了通用的计算方法,其实用价值是该计算方法比较准确的计算了这类问题.     

论艺术与仿生学的结缘

建筑仿生、工艺仿生以及人工智能艺术,是艺术与仿生学结缘的三个突出的方面。对之所进行的边缘性研究,旨在用艺术与科学相结合的方法,仿照某些生物的特征、机能,制作新的建筑物、艺术品、工艺品和具有独特审美价值的工业产品。艺术与仿生学的结缘是艺术起源观中的摹仿说在新的科学技术发展时代的一个质的飞跃。在技术美学领域,对艺术与仿生学的结缘尤为重视。     

世纪之交屈原研究的回顾和展望──'99岳阳两湖屈原与楚文化研讨会综述

综述了参与’99湖南岳阳两湖屈原与楚文化学术研讨会的专家学者的主要研究成果,介绍了有关世纪之交屈原研究的回顾与展望方面的成果。     

认知图式理论在翻译建构中的意义及其具体运用

图式是指已有的知识经验在大脑中形成的“框图”,即知识结构。翻译中通过联想、搜索译入语中有关图式,进行套用、模仿、迁移和重构,有助于发挥译入语的优势,实现双语符号的成功转换。按照认知心理学观点,运用图式进行传译可包括三个方面,即运用原型匹配、运用模板匹配、运用“自上而下”搜索。