A non-iterative continuous model for switching window computation with crosstalk noise

Proper modeling of switching windows leads to a better estimate of the noise-induced delay variations. In this paper, we propose a new non-iterative continuous switching model. The proposed new model employs an ordering technique combined with the principle of superposition of linear circuits. The principle of superposition considers the impact of aggressors one after the other. The ordering technique avoids convergence and multiple solution issues in many practical cases. Our model surpasses the accuracy of the traditional discrete model and the speed of fixed point iteration method.     

卫星网中的TCP慢启动机制的研究

摘要：TCP连接中的慢启动在卫星网的环境下对TCP性能有着非常重要的影响，讨论了动的相关的因素以及针对卫星网的特点做出的改进。在文章的最后，分析了一个实际操作系统中TCP／IP协议的滑动窗口实现。     

传输均匀场的加载介质壁矩形波导的研究

本文给出了一种能够传输均匀场的介质壁矩形波导，在数值计算的基础上得出了其结构参数；并进一步分析了加载工作物质对其场型的影响。     

美国战区高空区域防御系统拦截导弹红外寻的技术分析

美国战区高空区域防御（ＴＨＡＡＤ）系统拦截导弹，选用动能杀伤器与未袭目标直接碰撞摧毁目标，动能杀伤器采用红外成像寻的器。文中将对其红外成像寻的器的战术技术性能及有关技术进行分析，对其关键技术的解决措施进行探讨。     

Insertion loss of sound waves through composite acoustic window materials

This study evaluated the insertion loss of sound waves through composite acoustic window materials for sonar dome applications, and examined the influence of dome shape on the sonar performance. The insertion loss of sound waves through acoustic window materials was experimentally measured as a function of frequency at normal incidence. The insertion loss was also theoretically estimated with three- and four-medium layer models. The theoretical estimation of insertion loss showed good agreement with the experimental measurements. The insertion loss was also measured as a function of angle of incidence. The characteristics of longitudinal and converted shear waves were observed at various angles of incidence. This study will be useful to select acoustic window materials with the appropriate acoustic characteristics for practical sonar dome applications.     

The CH3D absorption spectrum in the 1.58 μm transparency window of methane: Empirical line lists at 81 K and 294 K and temperature dependence

In spite of its low isotopic abundance in methane (about 5×10⁻⁴), CH₃D contributes greatly to the very weak absorption in the 1.58 μm methane transparency window. This methane window deserves to be characterized in details because it is important for planetary applications in particular for Titan and the giant planets. In this work, we recorded the CH₃D spectrum by high sensitivity differential absorption spectroscopy (α_min≈5×10⁻⁸ cm⁻¹) both at room temperature and at 81 K. A list of more than 9000 lines was constructed from the 81 K spectrum for the 6099–6530 cm⁻¹ region. In order to get the temperature dependence of the line intensities, the low energy values have to be determined. The rovibrational assignments available in the literature provide low energy values for about 380 strong transitions of the region. This is insufficient to characterize the temperature dependence of the CH₃D absorption between 6200 and 6400 cm⁻¹. In this interval, a list of 5500 lines was constructed from the room temperature spectrum. The empirical energy values of the transitions were derived from the ratio of the intensities at 81 K and 294 K. The exact and empirical lower state energies included in the final line lists provided as Supplementary Material, allow for accounting for the temperature dependence of the CH₃D spectrum in the entire 6099–6530 cm⁻¹ region.Our measurements have been compared to the spectroscopic parameters and assignments available in the literature in particular those adopted in the HITRAN database. Improvements and corrections are proposed for the wavenumber calibration and for some lower state energies.     

基于改进的CV模型的医学图像分割

基于CV模型的水平集分割是医学图像分割的一个重要的分割手段。医学图像分割要求精度高,速度快。传统的处理方式效率比较低,不能满足医学图像的分割要求。针对这一缺点,本文提出新的分割模式。首先,在分割过程中间断的对图像进行窗口化处理,减少演化过程所需计算的数据量。同时使活动轮廓的演化速度伴随窗口规模进行调整,减少演变所需的迭代次数。实验表明,改进之后分割方法能够极大的提高分割速度,同时图像细节部分的分割也有更高的精度。     

基于分块和滑动窗口的车牌定位方法

车牌定位是车牌识别系统的关键环节.提出了一种利用分块和滑动窗口快速定位车牌的新方法.首先,进行垂直边缘的检测;然后利用分块和滑动窗口的方法进行搜索,产生车牌候选区域;最后经过判别得到车牌区域,并对边界加以调整.实验结果证明这种算法具有定位准确、效率高、适应性强的特点.     

在机顶盒环境中实现基于窗口消息传递的通用GUI

针对机顶盒的开发,在以往机顶盒软件基础之上提出在机顶盒环境中实现基于窗口消息传递的通用GUI的方案,它具有跨平台、可移植、可配置等特性。详细叙述了实现整个方案所做的工作。通过在ST平台和CONEXANT平台上的应用,很好地验证了该方案的可行性。     

Influence of La substitution on the electrical properties of metal-ferroelectric (BiFeO3)-insulator (CeO2)-semiconductor nonvolatile memory structures

Metal-multiferroic (La-substituted BiFeO₃)-insulator (CeO₂)-semiconductor (MFIS) capacitors has been fabricated. The crystalline phase and amount of La³⁺ substitution at Bi-site were investigated by XRD and XPS in the postannealing temperature range from 500 to 700 °C, respectively. The microstructure and interfacial layer between CeO₂ and Si substrate were characterized by HRTEM. The memory windows as functions of insulator film thickness and DC power for La were measured. The maximum memory window is about 1.9 V under ±6 V applied voltage. The ferroelectric polarization increases with increasing substitution amount. The morphologies of La-substituted BiFeO₃ films were also studied by AFM.