舵机加载系统的最优控制

分析了舵机加载系统的结构原理,建立其简化模型,并研究了最优控制在舵机加载系统中的应用.舵机加载系统中加载设备和舵机系统间存在强烈的耦合,针对舵机运动对加载系统跟踪性能的影响,应用前馈控制对舵机运动扰动进行补偿.为进一步提高系统性能,引入最优控制.根据舵机加载系统的特点,比较研究了3种不同的最优控制方法.常用的是工程近似最优控制方法,为进一步消除稳态误差,可以引入积分控制.与上述方法不同,对加载系统进行最优控制时,采用积分策略增广系统状态方程,并引入期望衰减度定义性能指标构造系统的最优控制.仿真结果表明,在文中所构造的最优控制和前馈控制的复合控制下,加载系统具有相对最佳的跟踪性能.     

微波通信新发展与通用发射机技术研究

作为传输介质,微波有着其他通信方式无法比拟的优点.微波中继通信系统以及现有的微波宽带通信系统是已经商用的系统.从通信系统使用的信道传输频率来看,属于微波通信系统的有卫星通信系统、地面微波中继通信系统、本地多点分配接入系统(LMDS)等系统.这些微波通信系统基本上具有相同的发射机结构,本文将探讨通用的微波发射机技术.     

W波段低成本数字通信系统

在毫米波频段,由于振荡器的频率漂移很大,常常采用锁相源,使系统成本大大增加.本文采用频率跟踪方案,实现了W波段数字通信系统,并详细描述了系统的关键技术.对8448kbit/s的数字通信实验表明,该系统的门限电平比采用锁相源的系统仅差3dB.该系统方案简单,成本大大降低.实验还表明,该方案中锁相环的采用没有对解调波形产生明显影响.     

MIMO系统中天线选择的关键技术及其应用

多天线MIMO系统利用多个收、发天线有效地改善无线通信系统性能,提高系统容量,增强系统可靠性.然而使用多个射频的MIMO系统增加了天线的体积、功率和硬件,从而增加了成本.天线选择是一种低成本、低复杂度的有效方法,可以利用多天线系统的多数优点.使用天线选择技术可以降低系统成本和复杂度,同时保留MIMO系统的优越性能.文中考虑了天线选择系统的一些实际应用问题,RF预处理,训练序列等的实际应用.最后,给出了一些天线选择的结论.     

基于认知的协作系统中继分配算法

随着无线移动通信系统的飞速发展,无线通信网络能耗急剧增加,基于中继协作技术的绿色无线通信研究受到众多研究者的关注.针对基于认知的中继协作系统,提出了一种以最大主系统能效为目标的中继分配算法.该算法在不影响主系统性能基础上,对主系统请求次系统用户作为中继转发数据,且共享主用户频谱进行了简要介绍.算法中次系统通过最大权重匹配方法为主系统分配中继（次用户）,在满足主系统能效最大化的同时,实现了次系统与主系统的频谱共享.对算法进行仿真验证,提出的算法能获得较高的主系统能效,同时提高了整个系统的频谱利用率.     

新奥特Mariana．5D在线图文包装系统（下）

专业化的产品Mariana产品线支持如下应用：在线图文包装.综艺节目制播.新闻节目制播,气象节目制播.财经节目制播.虚拟演播室.虚拟体育图文.体育节目直播等。其产品将包括：图文包装设计系统演播室字幕图文系统：虚拟演播室系统.虚拟体育图文系统;体育字幕直播系统：地理气象图文系统。     

关于变电站自动化控制系统仿真研究

变电站自动化系统是电力工业生产中的基础设施之一.在我国飞速发展的现阶段,电力工业已经成为国民经济发展的支柱,电力供应关系到工业的崛起和质量的保证,因此,在科技不断发展的过程中,变电站自动化系统也开始得到广泛的关注.变电站系统关系到不同系统之间的整合,为了提升系统的稳定性,提高变电站系统的效率,有必要引进仿真系统,结合电力系统运行的原理,关注仿真系统的融入,构建一个灵活的、具备开放向的系统,对变电站系统进行综合管控.本文针对变电站自动化控制系统仿真研究,推进变电站自动化系统的稳定运行.     

我国新一代卫星广播系统——先进卫星广播系统(ABS-S)

本文介绍我国新一代卫星直播系统,即先进卫星广播系统(ABS-S).该系统具有的系统性能及提供的业务完全适合未来卫星广播的各种需求.本文分析ABS-S的基本特征及系统性能,基于试验室及现场测试数据,证明了ABS-S系统的先进性.ABS-S系统明显优于目前广泛使用的卫星电视广播标准DVB-S,同时和第二代直播卫星电视广播标准DVB-S2相比,具有等同的性能,且具有更低的系统实现复杂度.最后,介绍了ABS-S系统的产业化推进及应用情况.     

粗糙集理论在C^3I系统效能评估中的应用研究

C3I系统是现代战争中战斗力的倍增器.客观准确地评估C3I系统效能对找出制约系统效能的发挥的薄弱环节有着重要的意义.首先建立了C3I系统评估指标体系和基于粗糙集理论的C3I系统效能评估模型.其次根据粗糙集理论对C3I系统性能指标进行约简,得到了影响系统效能评估的属性和规则.最后介绍了一种运用加权系数的方法,对C3I系统效能进行评估.结果显示粗糙集理论对C3I系统效能评估能取得较好的效果.     

合肥广播电视台10＋2高清转播车系统设计

文章介绍了合肥广播电视台10＋2高清转播车系统详情.本系统制作核心为高清设备,调度系统兼有高清和标清设备.在系统出口采用下变换方式,保证系统同时具备标清制作的能力.必须兼有完善的4∶3和16∶9的节目制作环境.具备1080i/50、1080i/60的制作能力,提供系统整体监控系统.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Towards Mobile Ubiquitous Service Environment

In this article we present a perspective on future vision of mobile communications and services which is referred to as Mobile Ubiquitous Service Environment (MUSE). Based on analysis of wireless communications and services, we exploit a conceptual model for MUSE via a top-down approach. The conceptual model consists of three major elements: Terminal Service Environment (TSE), Network Service Environment (NSE) and User Identity (UID). The concept of Always the Best Experience (ABE) is addressed as the hinge in design and development such that the user-centric services could be provided automatically and intelligently in the future diverse wireless world Based on these, we further discuss the issues on design and implementation of architecture of future wireless communication system. Requirements for architecture brought by the new features of MUSE are listed. Moreover, we also address several tradeoffs that should be taken into consideration in design. Finally, the deployment challenges for MUSE, such as reflectiveness of system, security and privacy, as well as peer-to-peer AAA are predicted.Ji Yang received PhD degree on Circuit and System, Bachelor degree on Telecommunication Engineering from Beijing University of Posts and Telecommunications (BUPT) in 2002 and 1993 respectively. Currently, he is an associate professor of BUPT, chief technical supervisor of Wireless Technology Innovation Institute, and vice manager of MTlab of Sino-Germany Software Institute. He leads the research on service and application in Future Forum in China. He also made much contribution to the China Communication Standardization Association (CCSA), including the vision of future Mobile Ubiquitous Service Environment, architecture of future B3G mobile terminal, etc. His research interests include architecture design for mobile ubiquitous networks, theory of self-organization, etc.Zhang Ping is now the professor of Beijing University of Posts and Telecommunications and director of Wireless Technology Innovation (WTI) Institute, BUPT. He has also served on the senior member of C3G Group, China MOST 863 future mobile communication FuTURE project, vice-chairman of China FuTURE Forum, and member of Vision Committee of World Wireless Research Forum(WWRF), he was vice chair of WWRF in 2005. He is also invited as the consultants for many domestic and oversea communication companies. He is very active on the international research activity on Beyond 3G area. He also participated in several European projects such as E2R and MOCCA. Until now, he has published 6 books, around 400 publications in journals and conferences in the area of telecommunications. His main research interests are theory and applications in wireless communication area. He was awarded by government, city of Beijing and Ministry of Information Industry several times for his great contribution to the industry and research activity in China.Hu Zheng is a PH.D candidate in mobile communications engineering in Wireless Technology Innovation Institute (WTI) at Beijing University of Posts and Telecommunications (BUPT). He received B.S degree from Nanjing University of Posts and Telecommunications in 2002, majoring in computer communications engineering. He currently works on serivce aspects of mobile ubiquitous communication system with focus on design and performance evaluation of interaction protocols and services in self-organized service environment.Wang Xu received the B.Tech. degree in electronic engineering from Beijing Polytechnic University (now named as Beijing University of Technology), Beijing, China, in 2002. Now he is working for his Ph.D. degree in Wireless Technology Innovation (WTI) Institute, Beijing University of Posts and Telecommunications (BUPT). His current interests include wireless communications in personal area, ad hoc networks and peer-to-peer system.Li Yinong received the BS degree major in Telecommunication Engineering in 1993 from Beijing University of Posts and Telecommunications, the MS degree and PhD degree major in Telecommunication and Electronic System in 1995 and 2003 from the Beijing University of Posts and Telecommunications. He is currently a lecture of STE (School of Telecommunication Engineering) of BUPT. His main research interests include service modeling, service composition approach, and intelligent service. In BUPT, he has given several lectures to both graduate and undergraduate students such as Information Theory, Speech Recognition, Pattern Recognition and Artificial Intelligence.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

High Speed Curve Interpolating D/A Converter

This paper presents a design of high speed curve interpolating D/A converter. We improve 8-bit data to 12-bit data, so the data resolution increases 16 times than that of original 8-bit data. The curve interpolator is developed from the linear interpolator. The simulation speed curve interpolator is about 500 MHz. The chip is fabricated by 0.8 m double-metal single poly CMOS technology. The active interpolation size of chip is 1 × 1 mm². The power dissipation is 200 mWatts at 5volt and 500 MHz for simulation result and 80 mWatts at 5 volt and 50 MHz for measurement result. The errors of interpolating result of curve interpolators are about 20 times less than that of original signal.     

Status and Trends in Advanced SOI Devices and Materials

提供了一种用于安德鲁反射测量样品制备新方法. 该方法采用聚焦粒子束刻蚀和磁控溅射,可以获得可控的、干净的、无应力的纳米接触用于自旋极化探测. 所制备的样品中,磁性和非磁性材料样品的反射谱都表现出复杂的峰和谷结构,这些结构可能源于与界面相关的零偏压反常以及与激发态相关的准离子相互作用. 对另一个Co40Fe40B20合金样品采用简单的钕针尖压针方法进行了对比性测量,反射谱中没有观察到谷结构,但谱结构出现较明显的热扩展,这种热扩展可能来源于界面处的非弹性输运. 所有的反射谱目前还不能由现有的理论给出令人满意的解释. 利用点接触反射方法获得可靠的自旋极化信息还有赖于接触界面特征的进一步分析. 而一个更切合实际的、更完善的理论成为迫切的需要.     

Memory Performance Optimizations For Real-Time Software HDTV Decoding

Pure software HDTV video decoding is still a challenging task on entry-level to mid-range desktop and notebook PCs, even with today’s microprocessors frequency measured in GHz. This paper shows that the performance bottleneck in a software MPEG-2 decoder has been shifted to memory operations, as microprocessor technologies including multimedia instruction extensions have been improving at a fast rate during the past years.Our study exploits concurrencies at macroblock level to alleviate the performance bottleneck in a software MPEG-2 decoder. First, the paper introduces an interleaved block-order data layout to improve CPU cache performance. Second, the paper describes an algorithm to explicitly prefetch macroblocks for motion compensation. Finally, the paper presents an algorithm to schedule interleaved decoding and output at macroblock level. Our implementation and experiments show that these methods can effectively hide the latency of memory and frame buffer. The optimizations improve the performance of a multimedia-instruction-optimized software MPEG-2 decoder by a factor of about two. On a PC with a 933 MHz Pentium III CPU, the decoder can decode and display 1280 × 720-resolution HDTV streams at over 62 frames per second.This work was done while the author was a Ph.D. candidate in the Computer ScienceHan Chen is a research staff member in IBM T.J. Watson Research Center. His research interests include distributed computing systems, scalable display system, and multimedia. He received his Ph.D. degree in 2003 and his M.A. degree in 1999 from Princeton University. He received his B.S. degree from Tsinghua University of Beijing, China in 1997.Kai Li is a Charles Fitzmorris professor at the Computer Science Department of Princeton University. His research interests include operating systems, computer architecture, distributed systems, and scalable display systems. He received his Ph.D. degree from Yale University in 1986. Prior to that, he received his M.S. degree from University of Science and Technology of China, Academy of Sciences of China in 1981 and a B.S. degree from Jilin University in China in 1977. He was a visiting faculty member at University of Toronto in 1988 and a visiting professor at Stanford University during his sabbaticals in 1996 and 2000. He has served on dozens of program committees and served as chair or vice chair several times. He has been elected as an ACM fellow in 1998.Bin Wei received a Ph.D. in Computer Science from Princeton University in 1998 and joined the research community at AT&T Shannon Laboratories since then. His research interests are in the areas of high-performance computer systems, multimedia, and service platforms for mobile users. He received a BS in Computer Science from Tianjin University, China in 1983 and an MS in Computer Science from the Institute of Computing Technology, Chinese Academy of Sciences, in 1989.     

一个具有附益性及保序性算子的形态学非局部拓展

近年，形态学非局部拓展工作在图像处理领域受到众多关注.而附益性算子是经典形态学的最基本形式，也是形态学分析方法最重要的变换工具.为此，一些研究者就形态学非局部拓展中如何保持算子的附益性开展工作.本文从理论及实例两个方面说明，相关拓展工作为保持算子的附益性而丢失了保序性的不足；进一步，通过设计非局部权值的获取过程，并结合现有工作，本文提出了一个新的形态学非局部拓展，并定理证明了所得算子同时具备附益性及保序性两个重要性质；人工合成图像及自然图像上的仿真实验也表明了本文所提算法的有效性.     

Energy-efficient resource allocation model for device-to-device communication in 5G wireless personal area networks

In general, there are several many devices that can overload the network and reduce performance. Devices can minimize interference and optimize bandwidth usage by using directional antennas and by avoiding overlapping communication ranges. In addition, devices need to carefully manage their use of resources, such as bandwidth and energy. Bandwidth is limited in wireless personal area networks (WPANs), so devices need to carefully select which data to send and receive. In this paper, an intelligent performance analysis of energy-efficient resource optimization model has been proposed for device-to-device (D2D) communication in fifth-generation (5G) WPAN. The proposed energy-efficient resource allocation in D2D communication is important because it helps reduce energy consumption and extend the lifespan of devices that are communicating with each other. By allocating resources in an efficient manner, communication between two devices can be optimized for maximum efficiency. This helps reduce the amount of energy needed to power the communication, as well as the amount of energy needed to power the device that is communicating with another device. Additionally, efficient resource allocation helps reduce the overall cost of communication, as the use of fewer resources results in a lower overall cost. The proposed efficient resource allocation helps reduce the environmental impact of communication, as less energy is used for communication. The proposed energy-efficient resource allocation model (EERAM) has reached 92.97% of energy allocation, 88.72% of power allocation, 87.79% of bandwidth allocation, 87.93% of spectrum allocation, 88.43% of channel allocation, 25.47% of end-to-end delay, 94.33% of network data speed, and 90.99% of network throughput.     

基于WDM的设备驱动程序设计和实现

设备驱动程序是硬件设备连接到计算机系统的软件接口。Windows驱动程序模型(WDM)是Windows平台的新一代设备驱动程序模型,WDM的研究对设计优良设备驱动程序有重要指导作用。文章分析WDM的工作原理和机制,着重介绍WDM设备驱动程序的设计和实现方法,并给出一个通用串行总线(USB)设备驱动程序的设计实例。该设计将USB驱动程序分为即插即用(PnP)、电源管理、USB初始化和USB设备输入/输出(I/O)等功能模块,具有结构清晰、易移植、复用性好等优点,在USB驱动程序设计中具有良好的应用价值。