MOS器件的ESD失效

静电放电(ESD)对半导体器件,尤其是金属氧化物半导体(MOS)器件的影响日趋凸显,而相关的研究也是备受关注.综述了静电放电机理和3种常用的放电模型,遭受ESD应力后的MOS器件失效机理,MOS器件的两种失效模式;总结了ESD潜在性失效灵敏表征参量及检测方法;并提出了相应的静电防护措施.     

Infrared Radiance Simulation and Application under Cloudy Sky Conditions Based on HIRTM

An algorithm based on hyperspectral infrared cloudy radiative transfer model (HIRTM) is introduced and a simulation method for infrared image of the generation geostationary meteorological satellite is proposed. Based on the parameters from weather research and forecast (WRF), such as the water content, atmospheric temperature, and humidity profile, the simulation data for the advanced Himawari imager (AHI) infrared radiative (IR) channels of Himawari-8 are obtained. Simulated results based on HIRTM agree well with the observed data. Further, the movement, development, and change of the cloud are well predicated. And the simulation of IR cloud image for the weather forecast has been obtained. This paper provides an improved method for evaluation and improvement of regional numerical model for weather forecast.     

基于树结构分层随机森林在非约束环境下的头部姿态估计

头部姿态估计是人类行为和注意力的关键,受到光照、噪声、身份、遮挡等许多因素的影响。为了提高非约束环境下的估计准确率和鲁棒性,该论文提出了树结构分层随机森林在非约束环境下的多类头部姿态估计。首先,为了消除不同环境的噪声影响,提取人脸区域的组合纹理特征,对人脸区域进行积极人脸子区域的分类,分类结果作为树结构分层随机森林的先验知识输入;其次,提出了一种树结构分层随机森林算法,分层估计多自由度下的头部姿态;再次,为了增强算法的分类能力,使用自适应高斯混合模型作为多层次子森林叶子节点的投票模型。在多个公共数据集上的多种非约束实验环境下进行头部姿态估计,最终实验结果表明所提算法在不同质量的图像上都有很好的估计准确率和鲁棒性。     

Optimal-correlation-based reconstruction for distributed compressed video sensing

Distributed compressed video sensing (DCVS) is a framework that integrates both compressed sensing and distributed video coding characteristics to achieve a low-complexity video coding. However, how to design an efficient joint reconstruction by leveraging more realistic signal models is still an open challenge. In this paper, we present a novel optimal-correlation-based reconstruction method for compressively sampled videos from multiple measurement vectors. In our method, the sparsity is mainly exploited through inter-signal correlations rather than the traditional frequency transform, wherein the optimization is not only over the signal space to satisfy data consistency but also over all possible linear correlation models to achieve minimum-l₁-norm correlation noise. Additionally, a two-phase Bregman iterative based algorithm is outlined for solving the optimization problem. Simulation results show that our proposal can achieve an improved reconstruction performance in comparison to the conventional approaches, and especially, offer a 0.7–9.9 dB gain in the average PSNR for DCVS.     

Optimization of recharge and pumping rates by means of an inverse 3D model

The paper concerns the optimization of pumping and artificial recharge rates under hydraulic head constraints. This optimization is accomplished by means of an inverse three-dimensional (3D) model which is a combination of a numerical model, sensitivity analyses and nonlinear regression. The optimization criterion used is the minimization of the sum of the squares between the calculated and the desired water table maps. These maps were established for the end of each month of the period from December to August so that the annual average flux is outward from the modeling area. This outward flux will push back the salt water intrusion. The assumed natural recharge rates of the different months equal the mean values of the period 1958–1977. The aquifer parameters describing the water conducting and storing properties are also required as input data as well as the initial hydraulic heads. The optimized parameters are the artificial recharge rates of the months December, January, February and March and the pumping rates of the months April, May, June, July and August. For the first-mentioned months, the pumping rates are considered as known. During the last-mentioned period, no artificial recharge is possible. A unique solution is obtained. To check the optimized rates, a water balance is made. With this balance, it is shown that the treated phreatic aquifer can be used as a subterranean reservoir to store water that is abundantly present in the winter until the summer when water demand is large. It is also proved that the salt-water intrusion can be stopped by the temporal storage of the artificial recharged water.     

An ARMA-type section model for average ten-day streamflow synthesis

Most of the rivers in Taiwan are short and run on a steep slope due to the island's topography. Because of the weak correlations of streamflow in time and the occurrence of extreme events such as typhoons, classical autoregressive-moving average (ARMA) models have difficulties in forecasting and synthesizing the average 10-day streamflow in Taiwan. In this study, the synthesis of the average 10-day streamflow of the Tanshui River in Taiwan is accomplished by a section model. The model divides the year-round streamflow records into several sections according to their distinguishable patterns, and each section is modeled by a separate ARMA model. For parameter control, a heuristic grouping procedure, based on statistical inference of the random noise part, is used to separate a year into a minimum number of sections. The section separation procedure follows the general precipitation pattern in a year. The case study results indicate high statistical agreement between synthesized series and historical records. Additionally, a new procedure, extended autocorrelation function (EACF), is introduced and applied in this study to assist in model identification.     

蓄滞洪区洪水演进模拟

系统地研究了描述洪水在蓄滞洪区内演进过程的一不恒定流模型和二维流模型，突出对河流与沿河堤外洼地间水流交换的描述和对淹没区各蓄水单元间水流交换的描述及河流与调蓄区水流连接的描述，最后简要介绍了实例。     

高拱坝泄洪振动水弹性模型

以小湾工程为背景，通过水弹性模型实验，判断高拱坝泄洪所引起的振动和影响，采用自己研制的物理和力学性能优良的加重橡胶材料，在计算机的辅助下，建成了１：１５０比尺的水弹性实物模型，完善了对库水－地基－坝体－脉动荷载相互作用的模拟；采用先进的测试手段和分析软件包，对该模型的模态和多种工况泄水响应进行了全面的测试与分析，并采用计算机数值模拟与实验成果相结合的方法对坝身泄洪振动进行了结构动力分析及反分析和反     

天然分汊河流的平面二维数值模拟

利用边界拟合坐标变换系统下的计算区域分解－组合处理技术、支流耦合迭代计算方法、支流迭合对接型坐标变换网格与非对接型流网正交坐标系统等新思想建立了适应很复杂河道情况与水力条件的平面二维天然分汉河流的流场与浓度场的数学模型．并通过计算实例验证了模型在工程中应用的可靠性与有效性．     

灰色系统模型在坝基位移预测中的应用

本文应用灰色系统理论对坝基位移观测数据序旬进行了分析，提出了等维新息模型存在着最佳维数区这一观点，建立了位移预测灰色模型，并将其成功地应用于千亩岙土坝沉降和侧向位移的预测，文中还讨论了位移预测灰色模型成功建模的条件及其应用于大坝安全监控的可能性。