海杂波特性分析方法研究和比较

在分析了一阶、多阶海杂波产生机理的基础上，从三个方面对现有的海杂波特性分析方法进行了总结和比较，并从统计特性和混沌特性的角度对海杂波特性作了进一步的研究，为全面研究海杂波特性及雷达系统仿真提供了理论依据。     

发展高电压等级真空断路器的技术问题探讨

本文对发展高电压等级真空断路器的关键技术问题，如触头材料，灭弧室耐压特性、电弧特性、弧后特性、波纹管设计及触头运动特性等进行了探讨，可为高电压等级真空断路器的设计提供依据。     

采用6dB/oct分频器的两路书架箱的制作[阻抗校正篇]

在设计LC分频器时通常是将负载阻抗视为固定值的纯电阻，负载阻抗不随频率变化。但是实际的扬声器的阻抗值是随频率变化的，在谐振频率f0时阻抗最大，偏离f0后阻抗减小，随后呈与频率成正比的上升特性。因此导致所设计的特性与实际的特性不一致。本文介绍如何设计校正电路，使扬声器的阻抗特性变成平坦的特性，从而获得设计LC分频器时希望的交叉特性。     

光网络中的TCP混沌特性仿真分析

为了研究OBS网络的TCP非线性行为特性，本文利用Markov链模型，通过计算TCP窗口序列的Lyapunov指数，分析了影响TCP混沌特性的因素，以及这些因素对混沌特性的作用方式。仿真结果表明，OBS网络的TCP窗口非线性变化行为具有混沌特性，网络丢突发包率、突发包封装周期、TCP流速率以及最大拥塞窗口长度都会对TCP混沌特性产生影响。     

激光流速仪测量离心泵叶轮内流场特性研究

考虑到传统方法在测量离心泵叶轮内流场特性时受到实验硬件设施的影响，存在忽视测量区域的问题，提出了激光流速仪测量离心泵叶轮内流场特性研究。利用激光流速仪数值模拟了离心泵叶轮内流场特性的测量，弥补了流场特性测量在硬件设施上的不足，深入研究了离心泵叶轮内流场地分布、结构演变以及动静干涉，实现离心泵叶轮内流场特性的测量。实验结果表明，利用激光流速仪测量离心泵叶轮内流场特性时，叶轮内干涉区、隔舌附近以及离心泵叶轮后缘位置处的流场分布比较紊乱，存在复杂的流动现象，在测量离心泵叶轮内流场特性时应该加以重视。     

半导体光放大器增益饱和及其开关特性的研究

从理论上研究了行波半导体光放大器的增益饱和特性。由半导体的单模速率方程出发，应用半导体光放大器的传输波动方程，推导了放大器的增益特性表达式。根据半导体光放大器增益饱和特性，研究了开关特性。     

InGaAlP LED发光特性分析

InGaAlP LED发光效率高，性能稳定，应用相当广泛。在InGaAlP LED的应用中，发光特性是相当重要的参数，而发光强度和半强度角是LED发光特性的两个主要参数。介绍了不同的InGaAlP LED芯片结构．分析了其发光特点及封装后的发光特性，讨论了不同的反射式支架结构对其发光特性产生的不同影响。     

应力对单模光纤偏振特性的影响

文章对单模光纤的偏振特性的影响因素进行了分析，并用实验方法对侧压和拉伸对单模光纤偏振特性的影响进行了研究，结果发现单模光纤的偏振特性随径向应力的增加呈周期性变化，随轴向应力增加时偏振特性变化不明显。     

GexSi1—x／Si反型基区晶体管—实验测定

叙述了p沟道GexSi1-x/Si反型基区晶体管（BICFET）的制备，材料特性以及电特性，BICFET是最早采用先进的GexSi1-x/Si制作工艺的双极晶体管，其p 沟道的实现是极为理想的^[1－2]，目前，GexSi1-x/Si BICFET的特性受当前制备工艺限制，而不受其物理原理的限制，这里给出的电特性包括单极特性－－BICFET作为异质结FET，以及和双极特性－－作为期望的高特性工作模式，参考文献[3]中详细介绍了GexSi1-x/Si BICFET器件的特性和理论模型，本文给出的实验结果与理论研究相当一致。     

回归分析法在风机特性中的应用

为得到理想的风机特性曲线，文中结合实际，在传统方法的基础上，提出了回归分析法，并在Matlab环境中对实测数据进行建模仿真，比较回归效果，得到了较为理想的风机特性曲线，消除了在以往特性曲线中存在的拟合曲线不光滑，回归效果不佳等问题，可有效地反映出厂风机的性能。     

广告软件和间谍软件的危害与防治

广告软件和间谍软件是在网络中收集用户信息的软件，通常它们潜伏在用户的计算机中并将收集的信息发回后台服务器。广告软件和间谍软件对计算机网络安全和用户隐私构成了极大威胁。本文探讨了广告软件和间谍软件的定义、危害、传播途径，并对预防和清除它们提出了建议。     

Designing an Embedded Video Processing Camera Using a 16-bit Microprocessor for a Surveillance System

This paper describes the design and implementation of a hybrid intelligent surveillance system that consists of an embedded system and a personal computer (PC)-based system. The embedded system performs some of the image processing tasks and sends the processed data to the PC. The PC tracks persons and recognizes two-person interactions by using a grayscale side view image sequence captured by a stationary camera. Based on our previous research, we explored the optimum division of tasks between the embedded system and the PC, simulated the embedded system using dataflow models in Ptolemy, and prototyped the embedded system in real-time hardware and software using a 16-bit CISC microprocessor. This embedded system processes one 320 × 240 frame in 89 ms, which yields one-third of the rate of 30 Hz video system. In addition, the real-time embedded system prototype uses 5.7 K bytes of program memory, 854 K bytes of internal data memory and 2 M bytes external DRAM. Koichi Sato is a Ph.D. student in the Department of Electrical and Computer Engineering at The University of Texas at Austin. He earned his B.S. in University of Tokyo, Japan in 1993. He worked for Automotive Development Center in Mitsubishi Electric Corporation where he was involved in lane and automobile recognition in vehicle video processing products such as automatic cruise control and drowsiness detection systems. He enrolled in the current University at 1998 and received an M.S in 2000. In his Master's thesis he worked on human tracking and human interaction recognition. His current work includes velocity extraction using the TSV transform, object tracking, and 3D object reconstruction. Brian L. Evans is a tenured Associate Professor in the Department of Electrical and Computer Engineering at The University of Texas at Austin. His research and teaching efforts are in embedded real-time signal and image processing systems. In signal processing, his research group is focused on the design and real-time software implementation of ADSL and VDSL transceivers, for high-speed Internet access. In image processing, his group is focused on the design and real-time software implementation of high-quality halftoning for desktop printers, smart image acquisition for digital still cameras, and 3-D sonar imaging systems. In signal and image processing, Dr. Evans has published over 100 refereed conference and journal papers. Dr. Evans is the primary architect of the Signals and Systems Pack for Mathematica, which has been on the market since October 1995. He was a key contributor to UC Berkeley's Ptolemy Classic electronic design automation environment for embedded systems, which has been successfully commercialized by Agilent and Cadence. His BSEECS (1987) degree is from the Rose-Hulman Institute of Technology, and his MSEE (1988) and PhDEE (1993) degrees are from the Georgia Institute of Technology. From 1993 to 1996, he was a post-doctoral researcher in the Ptolemy project at UC Berkeley. He is a member of the Design and Implementation of Signal Processing Systems Technical Committee of the IEEE Signal Processing Society, and a Senior Member of the IEEE. He is the recipient of a 1997 National Science Foundation CAREER Award. J.K. Aggarwal has served on the faculty of The University of Texas at Austin College of Engineering since 1964 and is currently Cullen Professor of Electrical and Computer Engineering and Director of the Computer and Vision Research Center. His research interests include computer vision and pattern recognition focusing on human motion. A Fellow of IEEE since 1976 and IAPR since 1998, he received the Senior Research Award of the American Society of Engineering Education in 1992, the 1996 Technical Achievement Award of the IEEE Computer Society and the graduate teaching award at The University of Texas at Austin in 1992. He has served as Chairman of the IEEE Computer Society Technical Committee on Pattern Analysis and Machine Intelligence (1987--1989); Director of the NATO Advanced Research Workshop on Multisensor Fusion for Computer Vision, Grenoble, France (1989); Chairman of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition (1993), and President of the International Association for Pattern Recognition (1992--1994). He is a Life Fellow of IEEE and Golden Core member of IEEE Computer Society. He has authored and edited a number of books, chapters, proceedings of conferences, and papers.     

Hardware implementation of HEVC CABAC binarization/de-binarization

High efficiency video coding (HEVC) video codec applies different techniques in order to achieve high compression ratios and video quality that supports real-time applications. One of the critical techniques in HEVC is the Context adaptive Binary Arithmetic Coding (CABAC) which is type of entropy coding. CABAC comes at the cost of increased computational complexity, especially for parallelization and pipeline of these blocks: binarization, context modeling and binary arithmetic encoding. The Binarization (BZ) and de-Binarization (DBZ) methods are considered as important techniques in HEVC CABAC encoder and decoder respectively. Indeed, an important goal is to get high throughput in hardware architectures of CABAC BZ and DBZ in order to achieve high resolution applications. This work is the only one found on recent literature which focuses on design and implementation of full BZ and full DBZ compatible with H.265 and H.264. Consequently, a hardware architectures of BZ and DBZ are designed and implemented by using VHDL language, targeted an FPGA virtex4 xc4vsx25-12ff668 board and emulated with ModelSim. As a result, the implementation of BZ and DBZ can process 2 bins/cycle for each syntax element when operated at 697.83 MHz and 789.26 MHz, respectively. The proposed designs exhibits an improved high-throughput of 1395.66 Mbins/s for BZ and 1578.52 Mbins/s for the DBZ. The obtained Area Efficiencies in our proposed BZ and DBZ are about 0.544 Mbins/s/slices and 0.606 Mbins/s/slices, respectively, and it is better than many recent works.     

培养细胞中病毒共感染的形态学依据

本文综合报道根据电镜下病毒的形态学和形态发生学的特征,从134份普通感冒和2份SARS患者鼻腔分泌物或咽拭子分离病毒阳性或可疑阳性的体外细胞培养物中发现有9份是两种病毒的共感染。它们是：腺病毒与副粘病毒共感染2份;疱疹病毒与副粘病毒共感染2份;鼻病毒与冠状病毒共感染1份;鼻病毒与正粘病毒共感染1份;鼻病毒与副粘病毒共感染1份以及冠状病毒与呼肠病毒共感染2份。十分罕见的是,在两份冠状病毒的感染细胞内分别观察到与鼻病毒和呼肠病毒的共感染,在感染细胞内和/或细胞外两种病毒的成熟病毒粒子均较多,而且在细胞浆内相互紧密接触。提出,在病毒共感染的培养细胞内,病毒在复制和组装的过程中各自病毒的基因和毒力是否会发生变异均值得病毒学工作者深入研究。     

基于SAT的ARX不可能差分和零相关区分器的自动化搜索

ARX（Addition，Rotation，Xor）算法基于模整数加，异或加和循环移位三种运算，便于软硬件的快速实现.不可能差分分析和零相关分析是攻击ARX的有效方法，攻击的关键是搜索更长轮数、更多数量的不可能差分和零相关区分器.目前很多的搜索方法都没有充分考虑非线性组件的性质，往往不能搜索得到更好、更准确的区分器.本文提出了基于SAT（Satisfiability）的ARX不可能差分和零相关区分器的自动化搜索算法.通过分析ARX算法组件的性质，特别是常规模加和密钥模加这两种非线性运算差分和线性传播的特性，给出了高效简单的SAT约束式.在此基础上，建立SAT模型进行区分器的搜索.作为应用，本文首次给出了Chaskey算法13条4轮不可能差分和1条4轮零相关区分器；首次给出了SPECK32算法10条6轮零相关区分器和SPECK48算法15条6轮零相关区分器；在较短的时间内，给出了HIGHT算法17轮的不可能差分和零相关区分器.与现有结果相比，无论是区分器的条数，还是搜索区分器的时间均有明显的提升.此外，通过重新封装求解器STP的输出接口，建立了自动化的SAT\\SMT分析模型，能够给出ARX算法在特殊输入输出差分和掩码集合下，不可能差分和零相关区分器轮数的上界.     

Mechanical Sensitivity Enhancement of an Area-Changed Capacitive Accelerometer by Optimization of the Device Geometry

A study of the enhancement of the mechanical sensitivity of an area-changed capacitive accelerometer by optimization of the device geometry is presented. The movable mass of the accelerometer was designed with many fingers connected in parallel and suspended over the stationary electrodes composed of differential comb fingers by means of mechanical beams anchored onto the substrate. The maximum displacement possible based on the chosen design structure was determined. From this displacement value the spring constant was calculated, and based on this spring constant value various combinations of the beam length and width were selected. The lengths and the widths were then varied and simulated using the Coventorware 2001.3 software. This was done as theoretical analysis showed that the mechanical beam dimensions are significantly more dominant in the overall device sensitivity. The displacement and spring constant variations with the beam dimensions at an applied acceleration was observed and analyzed. The same process was done for the number of fingers, length and thickness of each finger. Each of these was done in isolation based on the optimum geometry of the mechanical beams and tested to ensure that alterations of these aspects do not have a significant effect on the overall sensitivity. The modal and harmonic analysis were also simulated and observed to ensure the linearity and the stability of the dominant mode of the operation of the device. Optimum results of the device geometry are presented and discussed, along with suggested next steps.Badariah Bais received the B.S. and M.S. degrees from the Worcester Polytechnic Institute, Worcester, MA, in 1990 and 1992, respectively. Since 1997, she has been serving at the Department of Electrical, Electronics and Systems Engineering at Universiti Kebangsaan Malaysia as a teaching staff. She is currently pursuing her Ph.D. in Microelectronics at the Institute of Microengineering and Nanoelectronics (IMEN) at Universiti Kebangsaan Malaysia. Her research interests include MEMS sensors and microfabrication. She is a member of the Institute of Electrical and Electronics Engineer (IEEE).Burhanuddin Yeop Majlis received his Ph.D. in Microelectronics from University of Durham, UK in 1988, MSc. in Microelectronics from University of Wales, UK in 1980 and BSc. (Hons.) in Physics from Universiti Kebangsaan Malaysia in 1979. Now he is the director of Institute of Microengineering and Nanoelectronics (IMEN). He is a senior member of the Institute of Electrical and Electronics Engineer (IEEE) and the Chairman of IEEE Electron Devices Malaysia Chapter since 1994. He is also a member of Malaysian Solid State Science and Technology (MSSS). He has published three text books in electronics and one book on Integrated Circuits Fabrication Technology for undergraduate courses and more than 110 academic research papers. His current interest are MEMS sensor for automotive and RF applications.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

化合物半导体器件与电路的研究进展

介绍了GaAs,InP和GaN等几种重要化合物半导体电子器件的特点、应用和发展前景。回顾了GaAs,InP和GaN材料的材料特性及其器件发展历程与现状。分别讨论了GaAs基HEMT由PHEMT渐变为MHEMT结构和性能的变化,GaAs基HBT在不同电路应用中器件的特性,InP基HEMT与HBT的器件结构及工作特性,GaN基HEMT与HBT的器件特性参数。总体而言,化合物半导体器件与电路在高功率和高频电子器件方面发展较快,GaAs,InP和GaN材料所制得的各种器件电路工作在不同的频率波段,其在相关领域发展潜力巨大。     

Cluster‐based data dissemination,cluster head formation under sparse,and dense traffic conditions for vehicular ad hoc networks

Information and communication technologies have changed the way of operations in all fields. These technologies also have adopted for wireless communication and provide low cost and convenient solutions. Vehicular ad hoc networks are envisioned with their special and unique intercommunication systems to provide safety in intelligent transportation systems and support large‐size networks. Due to dense and sparse traffic conditions, routing is always a challenging task to establish reliable and effective communication among vehicle nodes in the highly transportable environment. Several types of routing protocols have been proposed to handle high mobility and dynamic topologies including topology‐based routing, position and geocast routing, and cluster‐based routing protocols. Cluster‐based routing is one of the feasible solutions for vehicular networks due to its manageable and more viable nature. In cluster‐based protocols, the network is divided into many clusters and each cluster selects a cluster head for data dissemination. In this study, we investigate the current routing challenges and trend of cluster‐based routing protocols. In addition, we also proposed a Cluster‐based Routing for Sparse and Dense Networks to handle dynamic topologies, the high‐mobility of vehicle nodes. Simulation results show a significant performance improvement of the proposed protocol.     

All-Learning: The state of the art of the models and the methodologies educational with ICT

This paper presents a systematic review of models and methodologies that integrate information and communication technologies (ICT) and education. The systematic review was based on the methodology of Kitchenham. The steps used and developed correspond to the steps proposed in the methodology. The starting point of the review are the research questions, then keywords, selection of the databases, definition of the inclusion and exclusion criteria, the definition of the search chains, search process and selection of papers, the analyzes of the paper and the results of the systematic review to answer the questions posed. In the systematic review, 919 papers were found in 6 academic databases and 129 relevant papers were selected. The work developed intends to know the different models and methodologies that integrate the ICT and the education. Develop an analysis and characterize to find common elements among models and methodologies. The idea is to find limitations, disadvantages and spaces that allow to propose a new model. This systematic review is the first step in the development of a doctoral research in which the development of a U-Learning model based on Connective Learning and Experience Learning is proposed.