环境噪声

The harm of worms' outbreak becomes greater and greater. Such make worm detection and defense technology face an increasingly tough challenge. Attack Signature Automatically Generation technology is one of the key technologies, this paper focuses on the ASAG technology for research, its main jobs include: 1）Analyzed the research status of ASAG technology from the overall, described its design goals and evaluation criteria, and the current approaches' limitations is given. 2） After deeply researching and analyzing a various of ASAG systems, a basic framework for the network ASAG system is presented, and the detailed analysis of the main function of the components in the framework is also presented. 3）An attack capture model based on distributed honey-pots system is presented. This mode integrates the anomaly detection which based on the mode of dubiety score in the honey-pots, can do a second filter for the samples in honey-pots, and improve the purity of the samples captured. 4） A simple noise-resilience ASAG algorithm is presented, which used the behavioral characteristics of the worm outbreak to generate efficient signatures of samples in the suspicious dataset, which contains large amounts of noisy data, under the complex environment.

攻击特征自动提取技术是网络蠕虫防御技术的关键技术，本文围绕攻击特征自动提取技术开展研究工作，其主要工作包括： 1）对攻击特征自动提取技术的研究现状进行了综述，介绍其设计目标与评价标准，并指出了现有方法存在的局限性； 2）在深入研究与分析各种攻击特征提取系统的基础上，提出基于网络的攻击特征自动提取系统的基本框架，并详细分析框架中各部件的主要功能； 3）提出了基于分布式蜜罐系统的攻击样本捕获模型，该模型在分布式蜜罐系统的基础上，结合基于可疑度模型的异常检测，对蜜罐中的样本进行二次过滤，较好地提高了捕获样本的纯净度； 4）提出一种简单抗噪的攻击特征自动提取算法，该算法利用蠕虫爆发时的行为特征，在复杂环境下含有大量噪声数据的可疑样本训练集中提取有效的特征，降低对样本纯净度的依赖。

The mass matrix and the stiffness matrix of the elements are derived with energy method.

不必要的振动和噪声会降低结构的使用性能并污染环境，因此，结构的减振降噪问题一直是一个十分重要的课题。

In order to solve this problem, a new method that compensates dynamic measurement error of sensors with measurement noise is proposed.

为了解决这个问题，研究了一个在噪声环境下，改善传感器动态特性的新方法。

In the precision detection of a millimeter wave, the encounter of the detector and the objects can not be forecasted totally because of a lot of noise and disturbance existing in the complex battlefield, it will cause fantasticality and distortion of the echo retaked by the detector, and the stably of the echo become bad, as a result, it will reflect the result of the detection, so it is necessary to filter the echo retaked by detector.

在弹载毫米波精确探测系统中，由于复杂多变的战场环境中存在大量的干扰及噪声，探测器与目标的交会姿态不能完全预测，造成探测器获取目标回波产生奇异和变形，回波特征的稳定性变差，从而影响了目标的探测和识别，因此对探测器的回波进行有效的滤波处理是十分必要的。

The control of vibration and noise is vital to environmental protection、the auto's flatness and endurance.

汽车振动、噪声控制关系到环境保护、汽车行驶平顺性和车辆的耐久性。

Acceleration sensitivity, which determines the noise level of sensing array induced by cable dithering and towing instability, as a result of the special working scheme, circumstance and structure installation of the towed linear array, is a key parameter of the fiber optic hydrophone for the towed linear array application. Therefore, the reduction of FOH acceleration sensitivity is important for the towed linear hydrophone array to achieve an excellent performance.

拖曳线列阵的工作方式、环境条件和结构安装等特点对光纤水听器的性能提出了许多特殊的要求，特别是加速度灵敏度，它关系到拖曳线列阵声纳能否有效地抑制由拖缆抖动及拖曳力变化等引起的振动噪声的干扰，因此降低拖曳线列阵用光纤水听器加速度灵敏度是光纤水听器拖曳线列阵系统性能的重要保障。

Three sides are around by mountains. the air has rich negative ion is good for a human health. The atmosphere entironment is suitable for furriery animal to grow.

三面环山，植被覆盖率高，空气中富含负离子，有益于人体健康，大气、水质、噪声等环境质量指标堪称一流，适宜特种毛皮动物的繁育生长。

Experiments under real environments were conducted to compare the proposed TDE method with the existing higher-order spectra, least mean square and generalized cross-correlation. The result shows that the propose m d TDE method is of higher robustness and precision.

野外坦克声数据实测表明，在无干扰环境下，算法性能与高阶统计量法、广义互相关法相当，但在武器噪声干扰下表现了更强的鲁棒性和估计精度；在各种条件下，文中算法都比最小均方自适应法表现出更好的性能。

Singers and instruments have to be able to get every note perfectly in tune.

在高噪声的环境下工作，要配戴适当的护耳罩及耳塞。

In comparison with the scheme of high-order SQUID gradiometer, the method is simple without introducing any extra-intrinsic noise to SQUID sensor.

与高阶梯度计方案相比，虽然当环境干扰改变时，它保持平衡的能力较低，但是这种方法不仅简单易行，而且对SQUID不引入任何附加的本征噪声，从而可大大降低建造昂贵电磁屏蔽室的费用。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。