查询词典 scheme

A new scheme for approximating the solution of 2D Maxwell's equations-the high order symplectic scheme is proposed to overcome the shortcoming of the conventional finite difference time domain. The scheme is obtained by discretizing the Maxwell's equations in time domain based on symplectic scheme with high order, and then evaluating the equation in spatial domain with second or fourth order finite difference approximation.

为克服标准时域有限差分方法的缺陷，引入一种新的数值计算方法－高阶辛算法求解Maxwell方程，即在时间上用高阶辛差分格式离散，空间分别采用二阶及四阶精度的差分格式离散。

The DH protocol, ElGamal encryption and ElGamal signature scheme, DSA are extended to Hypereliptic curves, and a new message recovery signature scheme based on Hyperelliptic curves is presented. And it is proved that this new message recovery signature scheme is not strong equivalent to HC-ElGamal signature scheme.

将DH协议、ElGamal加密体制、ElGamal签名和DSA推广到了HC上，提出了一个基于超椭圆曲线的消息恢复签名方案，并证明了这个消息恢复签名方案与HC-ElGamal签名方案不是强等价的。

In this paper, a high order accuracy difference method is presented for solving unsteady convection diffusion equation by using Implicit Perturbation Finite Difference scheme. Firstly, we use the steady convection diffusion equation, the constant coefficients of this equation are expanded to power series of grid-spacings, then the high-order Perturbation Finite Difference scheme is obtained by determining the coefficients of the power series. Put this scheme on unsteady convection diffusion equations and modified it, the IPFD scheme is constructed.

本文利用摄动差分思想，对定常对流扩散方程中的空间微商系数进行摄动展开，展开幂级数系数通过消去摄动格式修正微分方程的截断误差项求出，由此获得方程的隐式摄动差分格式，将此方法应用于非定常对流扩散方程，并加以修正，得到该方程的修正隐式摄动差分格式。

The results show that the KPW scheme is not a nominative signature scheme since the nominator not only can verify and prove the validity of given signatures but also can convert given signatures into universally verifiable signatures, and that the PL scheme is only a self-authentication signature scheme since anyone can verify the validity of given signatures.

摘要该文分别对一个指名签名方案和一个指名代理签名方案进行分析，结果表明：在KPW方案中签名人不仅能验证而且也能向第三方证明签名的有效性，甚至能将签名转化为通常的自认证签名，因此不是指名签名方案；在PL方案中任何人都可验证签名的有效性，它只是一个自认证签名方案。

According to the computational stability analysis conducted to the linear term time difference scheme in simple harmonic motion equation, one new semi-implicit integration scheme also is designed. By adopting a kind of revised time-explicitdifference scheme to these linear terms still included in spectral model governing equations, this defect of spectral model only partly used in semi-implicit integrating scheme, can be overcome to some degree.

以简谐振动方程中线性项时间差分格式对其计算稳定性影响为理论依据，本文设计了一种新谱模式半隐式时间积分方案，此方案通过对一般谱模式求解框架中那些隐含的线性项采用了一种显式修正的差分格式，可有效克服其国际谱模式半隐式时间求积方案实质上只是部分应用了半隐式差分格式的问题。

The ratio of the vertical load distributed between the arch rib and the tie beam of the two schemes is the same. For the integral girder deck scheme, the longitudinal beams and the deck slab of endure more axial force compared to the ballast girder deck scheme, especially to the deck slab with a conspicuous increase of the axial force and higher stress, and the tie beam endure less. The force-bearing characteristics of the cross beams under the integral girder deck scheme is obviously better than that of the ballast girder deck scheme, especially at the two ends of each cross beam.

在受力上，与道碴板桥面方案相比，整体桥面方案竖向荷载在拱肋和系梁之间的分配基本相同，混凝土板和纵梁分担的纵向力则相对更大，尤其是混凝土板，增幅较明显，应力水平整体较高，系梁分担的纵向力则得到减小，横梁的受力状况整体桥面方案明显优于道碴板桥面方案，特别是在梁端处。

Just in order to solve thisproblem, this subject further researches the new display solving scheme --WindML based onVxWorks system, demonstrates the enormous advantages of the new scheme in technology,proceeds with the architecture of WindML, based on WindML basic 2D display scheme,throughthe research and study of the systematic principle of WindML system and different service andmanagement,I have put forward the Chinese solving scheme based on VxWorks system, andthrough the study and research of FreeType 2 font engine and vector font, utilized WindMLsystematic mechanism , have finished the implementation of bitmap and vector Chinesecharacter in VxWorks system, and on the basis of which, have designed and optimized theinquiry algorithm of the Chinese input method editor, developed the Chinese input method editorbased on VxWorks system.

本课题正是为了解决这一问题，深入研究了基于VxWorks 系统新的显示解决方案——WindML，论证了新方案在技术上的重大优势，从WindML 的体系结构入手，以WindML 基本2D 显示方案为基础，通过对WindML 系统的系统原理，各种服务和管理的研究和学习，提出了基于VxWorks 系统的汉字解决方案，并通过对FreeType 2 字体引擎、矢量字体的研究，利用WindML 系统机制，完成了位图及矢量汉字在VxWorks 系统中的实现，在此基础上设计并优化了汉字输入法的查询算法，开发出了基于VxWorks 系统的汉字输入法。

Three factors (the total rate of win, the difficulty and the benefits execratory of winning a big prize) which influence the attraction to buyers are considered, and attraction function to evaluate the scheme's rationality is structured using classification weighting method. 3 Buyers'psychological curve is introduced and a model to describe the attraction of a scheme to buyers is built. Based on this, a model to find better lottery scheme is structured considering various constraints, and an optimal scheme is obtained under given constraints using paragraph division method. 4 Several plans for development of our future lottery are proposed by referring to the successful experience of overseas.

主要工作如下： 1对彩票概况以及彩票业的发展史和趋势进行简单介绍； 2综合考虑总中奖概率、高项奖中奖概率以及中大奖的期望收益等影响彩民吸引力的因素，采用分类加权法构造吸引度函数来评价方案的合理性； 3引入彩民心理曲线建立模型来描述方案对彩民的吸引力；在此基础上考虑各种约束条件，建立寻求更优彩票发行方案的模型，并采用分段遍历搜索方法求出给定约束下的最优方案； 4借鉴国外成功经验，对未来我国彩票业的发展提出几点设想。

Aiming at this drawback, an improved scheme is introduced,in which not only the advantages of the Harn scheme are kept,but also the homomorphism attack is resisted effectively. In addition, the new scheme can ensure the scheme's security when the same random key k is used.

文章针对该方案的不足，提出一种改进方案，新方案不但保留了Harn数字签名计算速度快及容易实现密钥共享等优点，而且能够有效抵抗同态攻击，并且在随机密钥k重复使用时能够确保方案的安全性。

Upon the problems mentioned above, this paper focuses on the following work:? Analyzes the advantages and disadvantages for the key researches both in and abroad;? Studies some existing international standards and protocols including SET and ASC X9;? Gives the designing rules for the secure scheme then proposes a general simple model for mobile payment;? A secure scheme called SeMo is designed according to the different security needs for lineate links and wireless ones;? Analyzes the security for the scheme still basing on the two distinct links, which improves the scheme fully fulfilling the security requirements such as: authentication, integrity, confidentiality and non-repudiation.

针对上述问题，本文作了以下几点工作：●分析了国内外对移动支付研究的现有关键技术的优缺点；●学习了一些现有的国际金融规范和标准为准则；●借鉴安全电子交易模型方案，并参考了ASC的X9系列规范，提出一个简单可行的移动支付一般模型；●根据该模型尝试着根据无线和有线两个不同接口对安全性的需要，设计出移动支付系统的安全方案SeMo；●然后再根据接口的不同对该安全方案进行分析，证明该方案能解决移动支付的安全问题，也就是手持设备的认证问题以及数据保密性、完整性等问题。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。