查询词典 curves

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。

The gabbro-diorites have high light rare earth elements, low heavy rare earth elements and weakly positive Eu anomalies in chondrite-normalized rare earth element curves, and with high LILEs and relative low HFSEs in primitive mantle-normalized trace element spider diagram.

稀土元素球粒陨石标准化曲线显示其具有富含轻稀土元素、贫重稀土元素以及微弱的Eu的正或负异常的特点。微量元素原始地慢标准化蛛网图上，岩体具富含大离子亲石元素，明显亏损高场强元素（Nb、Ta、Zr、Hf和Ti）等特点。

Keywords: image analysis, principal curves, principal curve component, neural network

仿真实验结果表明，主曲线成分分析能很好地解决非线性主成分问题，应用前景广阔。

The eighth chapter begins with discussion and empirical demonstration of Chinese benchmark rate, simulates and regresses the benchmark yield curve of Chinese bond according to the latest data, reviews factors having influence on Chinese benchmark yield curve through principal components analysis, illuminates the inescapability of regulation of Chinese bond yield structure through the comparative study on American bond yield curves with different terms.

第八章开始是对我国的基准利率进行探讨和实证分析，接着根据最新的数据来模拟和回归出我国国债的基准收益曲线，在此基础上运用主成分分析法考察了影响我国基准收益曲线的因素，并通过对美国不同期限国债收益率曲线的比较研究，来说明我国国债收益率结构的调整具有不可避免性。

The new theory unifies a series of the single nonlinear strength theories for various concrete materials, which includes the whole region between the upper-limit Mises circular and the lower-limit SMP curve on the π plane of principal stress space, and the strength curves on the meridian plane are the exponential functions.

该理论在主应力空间的π平面上含盖了从下限SMP曲线到上限Mises圆之间的所有区域，子午面上的破坏曲线为幂函数形式；共有四个材料参数，均具有明确的物理意义，并给出了参数的确定方法。

The concept and definition of linear process with independent increments were presented. Then the regression model and analysis method for linear process with independent increments were established. Furthermore, the regression equation and confidence limit curves were given.

提出了线性独立增量随机过程的概念和定义，建立了线性独立增量过程回归模型及其分析方法，给出了回归方程和高置信度、高可靠度的置信上、下限曲线。

The dissertation outlines the volume, unit and style of input and output parameter in the program, and plots curves according to the output parameter, illustrates the fine of the study.

概述了本论文所编写程序的输入、输出参数的物理量、单位，以及输入、输出文件的格式。将输出数据绘制成曲线图，说明本文的研究细化到气体辐射过程中的每一个波长段。

Projective transformation between two rational quadratic Bzier curves is determined by pairs of corresponding control vertices and weights.

对于有理二次Bzier 曲线，两条有理二次Bzier 曲线间的射影变换由它们对应的控制顶点和权因子所确定。

Properness of a parameterization is a basic property of rational parametric curves and it has been well studied when the coefficients of the parameterization are rational. However, such coefficients in engineering and CAGD are often represented with float numbers with errors.

有理参数曲线的恰当性是曲线的基本性质，虽然其在有理系数情况下已经有完备的结果，但在工程和CAGD应用中常常得到带误差浮点系数的有理表示形式。

Two T3 He and D3He reactions are chosen for generating the neutrons. The neutron beam is collimated with the multiplex shielding system. The source intensity is monitored by the proportional counter or semiconductor proton recoil telescope. The neutron response curves of ST-401 scintillators with thickness from 0.16mm to 2.00mm are measured versus neutron energy. The uncertainties of experimental results are discussed in detail.

选用T3He反应和D3He反应作为中子源，子源，中子束流采用复合屏蔽体进行准直，源强采用正比计数管和半导体望远镜进行监测，实验测量了厚度从0.16mm到2.00mm的八种规格薄闪烁体的能量响应曲线，对实验的结果的不确定度进行了分析。

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