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The results manifest that the influence of stochastic disturbance on upwind scheme and modified central explicit scheme is very small, and for exponent schemes, it is quite large.

结果表明，迎风格式和修正中心显式格式的计算结果受扰动的影响较小，指数型格式的计算结果受扰动的影响较大，并通过空间加密网格的方法可以控制边界、参数随机的影响。

Compared with the Upwind Scheme results and the theoretical values, it is showed that the LDFV scheme has the property of low dispersion and is suitable for aeroacoustic problem computation.

分别给出了远场和固壁的适用于气动声学计算的边界条件处理原则。

In this paper, the basic principle and the power factor of conventional SERDS are discussed. Aiming at its shortage of low power factor, boost chopper type SERDS is adopted. The equivalent circuit of the new scheme is built up, and then vector diagram is used to analyze the power factor of the system, also the harmonic distortion of the system is discussed. The experiment device is established base on a 380F/7.5 kW induction motor and a passive soft switching scheme is applied in order to improve the working condition of IGBT. At last, the experimental results are shown.

本文在分析传统串级调速原理的基础上，对系统的功率因数进行分析；针对传统串级调速系统功率因数低的缺点，采用升压斩波式串级调速系统加以改进；建立了升压斩波式串级调速系统的等效电路并采用向量图法对该系统的功率因数进行详细分析；分析了系统的谐波情况；构建了以7.5kW／380V电机为调速对象的升压斩波式串级调速系统实验装置，给出相应的实验结果；针对斩波器中IGBT处于硬开关状态的缺点，应用无源无损软开关技术予以改善，包括对软开关电路工作原理的分析、参数的设计并给出相应的实验结果。

This dissertation is mainly concerning digital image watermarking problems. In Chapter 2, a detailed survey on digital image watermarking is presented. In Chapter 3, an optimal scheme is proposed to use Human Visual System model to compute masking function. It will be used to control the strength of watermark signal for optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vector quantization.

本文讨论了数字图像水印及其在多媒体安全中的应用，主要围绕下列问题进行研究和创新： 1、优化的水印嵌入模型：本文对基于直接序列扩频技术的水印算法进行了改进，根据人类视觉系统感知模型，提出了优化的水印嵌入模型，在不可感知性条件的限制下，使水印的鲁棒性达到最高。

In Chapter 2, a detailed survey on digital image watermarking is presented. InChapter 3, an optimal scheme is proposed to use Human Visual System model tocompute masking function. It will be used to control the strength of watermark signalfor optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vectorquantization. Some important transform coefficients of the original image are firstlymapped into the nearest neighboring lattice points by using lattice vector quantizer,then watermark signal is added to the lattice points.

本文讨论了数字图像水印及其在多媒体安全中的应用，主要围绕下列问题进行研究和创新：1、优化的水印嵌入模型：本文对基于直接序列扩频技术的水印算法进行了改进，根据人类视觉系统感知模型，提出了优化的水印嵌入模型，在不可感知性条件的限制下，使水印的鲁棒性达到最高。2、基于格矢量量化的图像水印：本文提出了基于格矢量量化的多比特盲水印算法，不需要原始图象就可以实现水印信号的检测和译码。

The analysis result shows that this scheme not only has the properties of the common signcryption scheme,but also satisfies the public verifiability and forward security.

分析结果表明，该方案除了满足一般签密方案的安全性外，还满足公开验证性和前向安全性。

Thus, the new scheme is a very effective, dynamic verifiable secret sharing scheme.

因而，新方案是一种非常有效的、动态的可验证秘密共享方案。

Firstly, this paper puts forward an improved authentication and key distribution scheme for internet environment, in which we adhibit multilevel authentication center, encryption technology of DES, RSA and one-way function to actualize the safety of communication among the different user on network and reduces the workload of the authentication institution; at the same time, this scheme can also assure the security of network. Besides, it use the temporary symbol and the responds" sign of both-side correspondent to replace time stamp and applies them to internet communication to countercheck "rebroadcast attack and accordingly resolves the problem that it needs synchronization for network clock.

本文在首先提出一种改进的Internet网络环境下的认证及密钥分配方案，该方案考虑采用了多级认证中心，DES、RSA和单向函数加密机制，实现了网络上不同用户间的安全通信，降低了网上认证机构的工作量，同时也能够保证网络的安全性；并用通信双方的临时标志和响应者标识来代替时间戳应用于Internet通信中以防止&重播&攻击，从而解决了以往需要网络时钟同步这一难题。

Starting from analysis of the origens of carbon and calcium, and connecting with the features of the equipment of the ash- sluicing- water system, this paper puts forward a suitable antiscale scheme, and also puts foeward a transitional antiscale scheme.

文章从分析碳和钙的来源着手，结合冲灰系统的设备特点，提出了适合的防垢方案，同时也提供了一个过渡性防垢方案。

In order to make the analysis more deliberate and approvable, we used two methods of analysis. The first one is the SWOT tactics analysis. The second one is the statistical analyses of questionnaire results. Then, a new scheme is proposed in order to reform the engineering organization. The scheme is executable in the military regional teaching hospitals.

本研究利用访谈方式了解国军松山、桃园、台中、高雄、左营、花莲等六家区域教学医院之工务组织现况，并为使研究分析更加周延及结果受到肯定，同时采用两种分析方法，即以事实之内外部环境作SWOT策略分析及在假设问题条件下作问卷结果统计分析，之后提出一套新的工务组织再造方案，可於国军区域教学医院中执行。

"Yes, now you can give yourself airs," she said, you have got what you wanted.

"对了，您现在高兴了，"她说道，这是您所期待的。

Then the LORD said to me: Rebel Israel is inwardly more just than traitorous Judah.

上主于是对我说：＂失节的以色列比失信的犹大，更显得正义。