查询词典 efficient

The security of PKI system itself is especially emphasized during the system design and implementation process, which is in accordance with the pervasive characteristic of PKI. Second, the concept of a Trusted Key Management Center is introduced for the first time. This technology greatly strengthens key management practices and allows for smooth transition from PKI to Key Management Infrastructure . Third, certificate status mechanisms are investigated in depth, and a certificate revocation performance simulation system is devised. All these work will provide guides to practice and employment of PKI applications. Based on time constraints, a new taxonomy for authenticated dictionaries is proposed. Fourth, formal analysis of OCSP protocol is carried out; then an efficient and scalable OCSP system is developed. Fifth, the special requirements caused by the working environments of Wireless PKI are analyzed. Based on communicative hashing and dynamic Merkle hash tree, an efficient certificate status validation method suitable for WPKI is presented. Sixth, one important kind of fair exchange protocols is studied, and a new CEMBS based on RSA cryptosystem is proposed. Afterwards, a novel fair exchange protocol totally based on RSA signature scheme is devised.

在系统设计和实现的过程中，考虑到PKI作为普适性安全基础平台的特点，特别强调PKI系统自身的安全性；第二，首次在PKI系统的设计中提出了"可信密钥管理中心"的概念，这一独特设计大大地强化了密钥管理功能的实施，为PKI向密钥管理基础设施的平滑过渡提供了良好的技术准备；第三，对证书状态验证机制进行了深入研究，设计了证书状态模拟系统，以指导PKI系统和应用的部署和实施；在此基础上，基于时间约束首次给出了认证字典的一种新的分类方法；第四，对OCSP协议进行了形式化分析，设计和实现了一种高效、可扩展的OCSP系统；第五，分析了WPKI工作环境对设计安全基础平台提出的特殊要求，结合无线移动设备的具体特点，基于可交换杂凑函数和动态Merkle杂凑树设计出了一种适用于WPKI环境的高效证书状态查询机制；第六，对一类公平交换协议进行了深入的研究，从设计公平交换协议的密码基础结构出发，提出了一种新型的基于RSA密码体制的高效CEMBS；在此工作的基础上，设计了一种基于RSA密码体制的最优化公平交换协议。

In chapter 4, the case of risk asset allocation with allowed sell and restricted short sell is discussed, especially in case of restricted short sell, the efficient frontier piecewise partition is determined by using duality theory in parametric quadratic programming. And the concept of tripartition is introduced, economic meaning stated and algorithm to determine efficient frontier proposed.

特别对限制卖空的证券组合，应用参数二次规划对偶性理论解决了有效边缘曲线分片划分的问题，并引入了三元分割的概念，解释其经济意义，同时给出确定有效边缘的算法；对于协方差矩阵是奇异的情况，利用矩阵分块技术，得到不同情形下有效边缘的解析表达式，并用直观的几何图形描述，克服了M-V模型在实证分析中遇到的困难。

A series of convenient and efficient reactions have been developed. Especially, instead of using toxic phosgene, the triphosgene was employed in the synthetic process of some receptors, which provides a convenient. safe and efficient method for the preparation of chiral unsymmetrical urea.

深入研究了它们的合成方法，实现了多种简便有效的选择性合成，特别是以三光气代替剧毒的光气，实现了一条简便、安全、有效的制备手性不对称脲的方法。

In the sense of a row metrics,these conditions are very simpleand efficient,which supply some basic guarantees for obtaining an efficient pre-conditioning matrix.

在一种行尺度意义下，这些条件显得简单有效，为得到一个有效的预条件矩阵提供了某种基本保证。

Without utility function, group preference relation on alternative set was constructed in this paper by means of efficient numbers of alternatives, which are described by Pareto efficient solutions of a group of multiobjective decision making problems respectively considered by decision makers.

本文撇开效用函数的介入，直接依据由各多目标决策问题的Pareto有效解表示的供选方案的有效数，引进了决策群体在供选方案集上的偏爱关系。

Without utility function, group preference relation on alternative set was constructed in this paper by means of efficient numbers of a lternatives, which are described by Pareto efficient solutions of a group of mul tiobjective decision making problems respectively considered by decision makers.

一些学 者曾借助群体效用函数引进群体多目标决策问题有关效用解的概念，并且给出若干求解的方法。本文撇开效用函数的介入，直接依据由各多目标决策问题的Pareto有效解表示的供选方案的有效数，引进了决策群体在供选方案集上的偏爱关系。

However, the researches from 1980s until now discover that some stocks or portfolios have certain predictable model, through which investors can earn premium returns, and that the stock market is not as efficient as what Efficient Market Hypothesis states.

但是，从80年代后期至今的大量金融研究发现，某些股票和资产组合的收益存在着某种可以预测的模式，投资者能够依据已有的信息来获得超额回报，证券市场并不像有效市场假说所描述的那样"有效"。

Good and efficient after-sales service and quick response time, efficient for the client with a full range of services.

良好高效的售后服务，并以响应时间快、工作效率高为客户提供全方位的服务。

Generally, this new technique has three steps. First, mill the necked-in casing with the efficient milling cutter head; and then salvage and back-off the buried pipe by a suitable fishing tool based on fish tip status; at last, orderly use a efficient taper pups and taper to extend and dredge the casing refitment section.

该技术首先利用高效高效铣削式套铣头对缩径套管进行套铣，然后根据鱼顶情况选择合适的打捞工具打捞、倒扣出被埋管柱，最后将高效铣锥短节和铣锥对修套井段进行扩铣通径。

Furthermore, debugging tools and program analyzing tools will be more powerful if an efficient pointer analysis module is embedded Right for the importance of pointer analysis, many studies have been done in order to find an efficient and effective solution to pointer analysis. Many pointer analysis algorithms have been developed too.

正因为指针分析具有诸多非常重要的意义，曾有许多学者对这个问题进行了研究，也提出了多种指针分析的算法，然而以往的指针分析方法存在着如下不足：对赋值语句的指针分析还不够完善，这尤其表现在对结构赋值语句以及对递归数据结构内递归数据域的分析上。

Green function defined inphase space differs from one in coordinate space by its struc-ture which exhibits nonlocatity in coordinates and oscillatorybehavior with respect to momenta.

在相空间中定义的Green函数不同于通常坐标空间的Green函数，在结构上显示出对坐标的高度非局域性，而对动量则显示出振荡行为。

The upper front part of a saddle;a saddlebow.

前鞍桥马鞍前面的上部分；前鞍桥