优缺点

Of BOT and PFI popular financing modes, the paper provides development direction and reference for government department.

对当今国际流行的两种解决基础设施的融资模式BOT和PFI在历史背景、优缺点等各方面进行了深入的比较分析，以期能对政府部门决策提供指导和借鉴。

This was mainly because of the ability of detecting genetic variance of the two techniques.5. At the end of this paper, we compared the parameters that were used in population genetics.

本文对应用于群体遗传分析的各种参数进行了系统的比较，以RAPD分析结果为例分析了各参数的优缺点和使用限制等。

To date, many investigations have focused on the ceramic fibers, and some methods such as melt/drawing method, slurry method, solution dipping method, CVDmethod, CVR method, sol-gel method, preceramic polymer method, hydrothermal method have been developed for the preparation of the ceramic fibers.

各种制备方法都各有优缺点，各种制备技术因所制备的纤维性能和用途不同而使其依然发挥各自不同的作用，但纵观连续陶瓷纤维制备技术的发展轨迹，可以发现溶胶-凝胶法日益成为研究与开发的主流。

This paper introduces two working principles for increasing pressure to solve the insufficient pressure in the fire tank .

介绍了解决消防水箱压力不足常用的2种增压设施的工作原理；通过实例计算，说明了2种增压设施的计算内容与计算方法，对2种增压方式的优缺点进行了比较；提出了设计中选用增压方式的原则

This paper first analyses and summarizes the ststus quo and evolution trend of encryption, some common used cryptograph are introduced, including the algorithms used in symmetric cryptosystem and asymmetirc cryptosystem. We describe the theory of each algorithms and compare the elliptic curve cryptosystem with the other two asymmetric cryptosystems to show the advantages of this algorithm. Second, the principle of ECC is discussed, including the math foundation of ECC, basic conception of elliptic curves, constructiong idea of ECC, operation on the elliptic curve and so on. Third, the current attacks of ECC were analyzed deeply, and an algorithm based on limited prime number field was constructed. We analyzed its realizability in theory, and implement it by using certain function of MIRACL software package. Latter half in this paper, the implementation model of a simple elliptic curve encryption system which based on GF has been introduced. The paper also put a deep analysis on the algorithm of point addition and point multiplication.

本文首先对密码技术的发展现状及其发展趋势进行了分析和综述，详细的介绍了私钥密码系统和公钥密码系统的发展，说明各种算法的原理和优缺点，并给出了一些典型的密码体制的简要分析，重点将椭圆曲线算法与其它几种公钥密码算法比较，说明椭圆曲线算法的优势；其次，探讨了椭圆曲线密码体制的原理，包括椭圆曲线密码的数学基础、基本概念、椭圆曲线密码体制的构造思想等问题；第三作者对椭圆曲线的攻击现状作了详细的分析，针对所使用的大素数域F_p，设计了素数域上安全椭圆曲线产生的算法，从理论上做了可实施性分析，从软件上做了具体实现；在本文的后半部分，提出了一个简单的基于有限素数域上的椭圆曲线加密方按算实现模型，并对SECES中设计的点加和点乘运算进行了深入分析。

This article will introduce the various types of reduced-order model, analysis of their principle, comparison of their advantages and disadvantages.

本文将介绍各类降阶模型方法，分析它们的原理，比较它们的优缺点。

Most arithmetics of data fusion have its default in the processing to uncertain and unintegrity data. The method of probability and statistics is difficult to obtain the prior probability of the occurrence.

数据融合的方法很多，但现有算法都有各自的优缺点，因而也都有各自的适用范围，到目前为止尚未形成统一的算法理论。

Sit down and write a pro/con list about your partner and your relationship.

坐下来，写出你的伴侣和你们关系的优缺点。

After compairing the characters of logit model and probit model, this paper chooses logit model as the parking choice model.

接着在分析了logit模型和probit模型的优缺点后，决定选用logit模型作为停车场选择模型。

Reliability allocation is an important phase of overall system design. Traditional methods for solving reliability allocation problems, such as AGREE allocation, proportional allocation and so on, have different advantages and shortcomings.

系统可靠性分配是型号总体设计的一个重要环节，传统的用于解决可靠性分配问题的方法，如AGREE分配法、比例分配法等，具有不同的优缺点。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐