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The safety of Domain Name System is a more and more important issue nowadays . To against attacks to DNS , Internet Engineering Task Force proposed Domain Name System Security .

DNS系统的安全性得到了越来越多的关注，为了对抗DNS系统受到的各种安全威胁，IETF提出了在现有DNS协议里加入域名系统安全扩展。

As a typical example of the application of system theory to the material science, the method of transfer function has been applied in this paper to convert the operational impedance from frequency domain to time domain by inverse Laplace transform in order to study the hydration dynamics of cement .

应用传递函数方法，通过Laplace逆变换将运算阻抗从频域转换成时域，以此求得水泥水化动力学曲线，结果与其它方法相符。此方法还可了解水泥水化过程的机理，对动力学过程具有普遍性

This paper analyzes the structure and distributed parameters of electrostatic discharge simulator during discharge, establishes a 9-component circuit model of BMM-ESD,obtains the current expression in complex frequency domain,and then gets a ESD current expression in time domain by Inverse Laplace transform.

为进一步发展BMM-ESP电流的电路建模求解法，分析了静电放电测试环境在实际放电测试过程中的寄生参量并建立了一个9元件ESD电路模型，求得了电流在复频域的表达式，进而通过拉普拉斯反变换解得了BMM-ESD电流时域解析式。

By carrying out ~1H spin-diffusion experiments,the domain sizes of DNA in the complexes were determined.The domain size of DNA is found to decrease greatly when the N/P ratio changes from 0.5 to 3 and changes only slightly with further increase of the N/P ratio.After making a thorough analysis and discussion on drug control release and gene delivery systems with general NMR techniques,we presents a method of 1D PFG NMR technique to realize quick observation on the Mw change of polymer during its degradation process.Moreover,according to the inverse Laplace transformation theory and based on a function of diffusivity distribution of polymer in solution,2D PFG NMR technique is developed to measure the Mw distribution of polymer.Combined with Monte Carlo simulation,the degradation mechanism can be figured out.

从发展新的核磁共振方法，拓展核磁技术应用范围的角度来看，本文首次提出了采用一维脉冲梯度场技术快速测量降解过程中聚合物的分子量变化的新方法；并首次将Monte Carlo模拟与PFG实验结果进行了关联分析，从而不仅可以实时观测体系分子量的变化，而且可以对体系的降解机理进行深入分析；首次将延伸型指数函数引入对自扩散曲线的拟合，并通过反拉普拉斯变换，建立了一种实时测量聚合物体系分子量分布的新方法；首次将固体核磁共振的研究方法，引入聚合物/DNA复合物体系的研究。

Fourier transform and inverse Fourier transform build up mapping for signal between time domain and frequency domain.

傅立叶变换及其反变换建立了信号时域与频域的映射关系。

In the c ognitive domain, the synaesthetic image involves the mapping of image from a low er modality onto a higher one more frequently than its inverse, the mapping fromthe more accessible properties of the source image to the less accessible one o f the target image. In the aesthetic domain, the synaesthetic image, as a novel metaphorical image,provides much food for the subject's aesthetic experience.

在认知的范畴里，通感意象一般产生于由低级感官域的意象到高级感官域的意象的映射，亦即从可及性较强的意象特征到可及性较弱的意象特征的映射；在美学的范畴里，通感意象作为一种新颖的隐喻意象丰富了主体的审美体验；而在文学的范畴里，通感意象则具有诗学的功能，表现出叙事的文学性。

This paperexplores the way to analyze the time domain amplitude spectrum , frequency domain power spectrum and inverse frequency spectrum todetect faults with AI technology, especially expert system.

本文探讨了利用智能技术特别是专家系统来进行旋转机械的时域幅值谱、频域功率谱及倒频谱分析，从而进行故障诊断的方法和途径。

In the ***, all types and fundamental principles of Radon transform are summarized systematacially. This *** starts from the general linear Radon transform, and then researches how to use the damped least square method to find the solution of the forward transform. However, the least squares smoothing effect will lead to a certain degree of trails in the data of Radon domain, which led to the application\'s limitations. After that the implementation in Radon domain and relative merits of linear Radon transform, parabolic Radon transform and polynomial Radon transform which have time invariance are introduced, the conjugate gradient method that can solve numerical solution is also given. And then the high resolution Randon transform is discussed, it introduces the regularization theory and Bayes principle into inversion, which successfully remove the negative affect caused by discrete Radon transform. Finally, we introduce the optimal weighting similar coefficient Radon transform, which adapt to the time variant quality of hyperbolic Radon transform.

本文系统总结了Radon变换的各种类型及其基本原理，从τ- p变换(即一般线性Radon变换)出发，研究利用阻尼最小二乘平方法求解其正变换，但是最小平方法的平滑作用会导致Radon域数据存在一定程度的拖尾效应，给这种方法的应用带来了很大的局限性；然后先容了具有时不变性的线性、抛物和多项式Radon变换在频率域的实现及其优缺点，给出了求解其数值解的共轭梯度算法；接着讨论了高分辨率Radon变换，它把正则化思想和贝叶斯原理引进到了反演中，很好的克服了离散Radon变换产生的截断效应对结果的不利影响；最后先容了适应双曲Radon变换时变性质的高分辨率最优相似系数加权Radon变换。

Public domain is characterized by openness,public—ownership,irrevocability and formality.Based on the premise that the author'S work will not be interfered in.public domain uhimatelv aims at the enlargement of its own universe and prosperity of the culture of human society.

公共领域具有开放性、有主性、不可撤销性和程序性等特征，它以保证作者的创作为前提，但却最终以自身的不断扩大和人类社会的文化繁衍为依归。

Cases linear form (bat, cat, eat, fat, hat, jat, lat, mat) said that if the single-chain Sketch 3, the first guideline for head and terminal node pointer that domain List every single node in the storage address is stored in its previous trend next node domain, and begin before becoming a node, it should be established at the beginning of the first indicators head node.

案件线性表（蝙蝠，猫，吃，脂肪，帽子，李祖泽，拉脱维亚，垫子）说，如果单链示意图三，第一个纲领性文件头部和终端节点的指针域的名单上的每一个节点的存储地址是储存在其以往的趋势，明年节点的网域，并开始之前，成为一个节点，它应建立在开始的第一指标，头部节点。

I can not negligent, he should do what?

我不能不在意了，他要做什么呢？

It is very dangerous to swim in the river alone.

一个人到河里游泳是很危险的。