为实现高性能选择正确的SRAM架构

按惯例，设计人员总把SRAM作为其最基本的形式，即单端口、单时钟域器件。在需要更高性能时，设计人员通常会选择更高的时钟频率和更宽的总线。尽管这样可以显著提高SRAM性能，但却并不是唯一的方法。我们也可以开发用于先进通信系统的存储器，这就将工作重点转向了带宽，而不是时钟频率。     

用于单芯片系统的改进型WXGA LCoS成像器

本文讨论用于单芯片时序混色的菲利浦DD-720硅基液晶(LCoS)片。这种芯片主要用于HDTV背投影机和多媒体系统。与菲利浦以前的单片LCoS设计相比，由于该芯片具有电接口接点较少、封装简单和温度传感器内置等许多特点，使其应用于投影系统时成本降低。     

多制式单片Y／C分离电路的原理及应用

本文全面介绍了ＰＨＬＩＰＳ公司设计生产的低功耗，免调整用于多制式（ＰＡＬ、ＮＴＳＣ）ＴＶ信号Ｙ／Ｃ分离的单片集成电路ＳＡＡ４９６１，对其管脚功能，芯片内部工作原理和器件特性等方面作了详细叙述，并例举了它在熊猫牌２９９９Ｆ型纯平面彩电及熊区长牌２９２６Ｅ型“１００Ｈｚ”双频彩电线路中的具体应用实例。     

单透镜成像光谱设备光谱定标方法

针对单透镜成像光谱仪的光谱标定展开研究，利用单色仪扫频方式标记波长与像平面的相对关系，利用汞灯特征谱线进行验证。针对选用的单透镜型号，设计定标方案及步骤，根据方案搭建实验平台，完成实验分析验证，最终结果表明该定标方法适用于单透镜成像光谱设备。     

点接触平面栅型硅单电子晶体管

设计了点接触平面栅型硅单电子晶体管,利用自对准技术实现了点接触平面栅,并通过给平面栅施加偏压实现了量子点。讨论了点接触平面栅型单电子晶体管与其通道宽度和平面栅上电压的关系。对一个具有70nm宽通道的器件,先在其表面栅上施加很小的正偏压,然后又在其平面栅上施加负偏压耗尽通道,最终的研究结果显示在通道中形成了单个量子点。     

单片式视频点播终端的设计与实现

主要介绍目前最新型的单片机顶盒，此单片式方案采用了LSI Logic公司的SC2000芯片，并具体描述了其硬件及软件的设计与实现。     

基于TOPSwitch器件的单片开关电源设计

介绍了基于TOPSwtich器件设计实现的单片开关电源，分析了其基本的工作原理，给出了实用电路及主要单元电路的设计方法。     

高速PWM单粒子瞬态效应脉冲激光模拟试验研究

利用脉冲激光验证高速脉宽调制控制器（Pulse Width Modulator,PWM）单粒子瞬态效应的敏感性和防护设计。试验中,通过改变脉冲激光能量,逐步扫描PWM控制器电路,确定了诱发单粒子瞬态效应的激光能量阈值和敏感区域。通过改变PWM控制器软启动配置电路设计,验证了防护电路设计的合理性,为卫星电源子系统的单粒子瞬态效应防护设计提供技术参考。     

基于单平面双螺旋谐振单元左手传输线研究

单平面双螺旋谐振单元是一种左手单元,具有不需缺陷地结构和小型化的特点.该文主要对由单平面双螺旋单元组成的对称和非对称两种传输线形式进行了仿真研究.利用电磁仿真工具,仿真分析了两种形式传输线的回波损耗和插入损耗特性.由仿真结果可知,非对称形式传输线的电磁性能较好.该文设计了两组对比仿真实验,即对称和非对称形式传输线结构相位特性对比,一、四单元非对称传输线相位特性对比,对传输线结构的相位特性进行了分析.结果表明,基于单平面双螺旋结构的非对称形式传输线具有左手效应.     

激光二极管抽运单块高斜度效率环形腔单频固体激光器

对于单块结构非平面环形腔单频固体激光器．谐振腔尺寸和输出耦合面偏振膜反射系数的选取是其获得单频、高效率、高功率输出的关键。采用琼斯矩阵的方法讨论了单块激光器获得单频输出的工作原理。通过对谐振腔回路琼斯矩阵特征值的平方及特征值平方差的计算，提出了在品体尺寸、磁场及抽运功率一定的情况下．通过对单块非平面环形腔输出耦合面偏振膜反射系数的设计来提高激光器的单频输出功率及斜度效率的方法。实验采用光纤耦合输出激光二极管(LD)纵向抽运单块激光器，当抽运功率最高用到2．83W时。获得了最大1．20W的1064nm单频激光输出．斜度效率达47．4％。     

Reliability and cost: Questions for the engineer

In designing a subsystem for a major system, a design engineer is often faced with a number of options, ranging from an inexpensive subsystem with low reliability to a highly reliable subsystem, usually costing considerably more. The basic question which we address in this paper is how to choose among these competing subsystems. This paper utilizes both reliabilities and costs to find the subsystems with the lowest overall expected cost. These concepts are then applied to k-out-of-n: G subsystems. A computer program has been developed to assist the design engineer in exploring and graphing the relative expected costs of competing subsystems over a range of values.     

（英）光电成像系统的协同设计方法研究

在传统的光电成像系统设计中,光学子系统和电子学子系统是分开设计的.这导致两个子系统的参数化之间协调程度降低,导致子系统兼容性不完善.为了提高各子系统之间的兼容性,缩短设计时间,减少开发成本,本文提出了一种协同设计方法.在端到端光电性能评价的基础上,采用多目标多参数优化算法对光电成像系统的配置参数进行优化.利用该方法对空间红外成像系统配置参数进行了优化,且获得良好在轨成像效果.结果表明,该方法对优化光电成像系统的参数配置,评价光电成像系统的性能具有积极的作用.     

基于动态逆的队形保持控制器设计

研究了无人机之间存在气动耦合的编队飞行系统模型。对模型运用时标分离原则将其划分为快变和慢变两个子系统,并且快变子系统的输出作为慢变子系统的输入参与控制。两个子系统分别用动态逆设计控制器,并在慢回路用干扰观测器补偿逆误差和模型的不确定性。通过仿真说明所设计的紧密队形保持动态逆控制器是非常有效的。     

Optimal design of k-out-of-n:G subsystems subjected to imperfect fault-coverage

Systems subjected to imperfect fault-coverage may fail even prior to the exhaustion of spares due to uncovered component failures. This paper presents optimal cost-effective design policies for k-out-of-n:G subsystems subjected to imperfect fault-coverage. It is assumed that there exists a k-out-of-n:G subsystem in a nonseries-parallel system and, except for this subsystem, the redundancy configurations of all other subsystems are fixed. This paper also presents optimal design polices which maximize overall system reliability. As a special case, results are presented for k-out-of-n:G systems subjected to imperfect fault-coverage. Examples then demonstrate how to apply the main results of this paper to find the optimal configurations of all subsystems simultaneously. In this paper, we show that the optimal n which maximizes system reliability is always less than or equal to the n which maximizes the reliability of the subsystem itself. Similarly, if the failure cost is the same, then the optimal n which minimizes the average system cost is always less than or equal to the n which minimizes the average cost of the subsystem. It is also shown that if the subsystem being analyzed is in series with the rest of the system, then the optimal n which maximizes subsystem reliability can also maximize the system reliability. The computational procedure of the proposed algorithms is illustrated through the examples.     

Subsystem backstepping design for controlling a class of nonlinear SISO systems with cascade structure

This paper presents a controller design, referred to as the subsystem backstepping design (SSBD), for a class of nonlinear SISO mechatronic systems that comprise several cascaded subsystems. Compared with the conventional integrator backstepping design (CIBD) that deals with a first-order equation at each design step, the SSBD manages at each design step a subsystem that can be of high order. This both simplifies the design procedure and also makes controller parameters conveniently determined according to dynamic characteristics of each subsystem as in the conventional cascade control design with multiple feedback loops. However, in contrast to the conventional cascade control design, the SSBD does not require the inner feedback loop to respond much faster than the outer feedback loop, while guaranteeing system stability for a class of nonlinear systems. In addition, a variant of the SSBD, called internal model principle-based SSBD (IMP-SSBD), is presented to both further demonstrate the advantages of the SSBD procedure over the CIBD and also achieve robust tracking performance. The effectiveness of the proposed scheme is demonstrated through experimental studies of a harmonic drive system suffering from transmission compliance and periodic disturbances.     

煤炭生产管理信息系统的研究与设计

结合煤炭生产企业的一般需求,为了对煤炭生产实施全程管理,设计了一种煤炭生产管理信息系统。与传统系统相比,该系统细化功能功能需求,使系统功能更加完善。该系统划分5个子系统,包括一通三防子系统、设备管理子系统、生产管理子系统、安全管理子系统、系统管理子系统。提出了系统的设计思想,完成对系统的总体设计。通过建立该系统,使煤炭生产流程的管理更加合理化、系统化。     

Tuning hydrostatic two-output drive-train controllers using reinforcement learning

When controlling a complex system consisting of several subsystems, a simple divide and conquer approach is to design a controller for each system separately. However, this does not necessarily result in a good overall control behavior. Especially when there are strong interactions between the subsystems, the selfish behavior of one controller might deteriorate the performance of the other subsystems. An alternative approach is to design a global controller for the entire mechatronic system. Such a design procedure might result in more optimal behavior, however it requires a lot more effort, especially when the interactions between the different subsystems cannot be modeled exactly or if the number of parameters is large.In this paper we present a hybrid approach to this problem that overcomes the problems encountered when using several independent subsystems. Starting from such a system with individual subsystem controllers, we add a global layer which uses reinforcement learning to simultaneously tune the lower level controllers. While each subsystem still has its own individual controller, the reinforcement learning layer is used to tune these controllers in order to optimize global system behavior. This mitigates both the problem of subsystems behaving selfishly without the added complexity of designing a global controller for the entire system. Our approach is validated on a hydrostatic drive train.     

Design and preflight performance of ASTER instrument protoflightmodel

The Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) is an advanced multispectral imager with high spatial, spectral, and radiometric resolution, built to fly on the EOS-AM1 spacecraft along with four other instruments, which will be launched in 1998. The ASTER instrument covers a wide spectral region, from visible to thermal infrared with 14 spectral bands. To meet the wide spectral coverage, optical sensing units of ASTER are separated into three subsystems: visible and near-infrared (VNIR) subsystem, shortwave infrared (SWIR) subsystem, and thermal infrared (TIR) subsystem. ASTER also has an along-track stereoscopic viewing capability using one of the near-infrared bands. To acquire the stereo data, the VNIR subsystem has two telescopes, one for nadir and another for backward viewing. Several new technologies are adopted as design challenges to realize high performance. Excellent observational performances are obtained by a pushbroom VNIR radiometer with a high spatial resolution of 15 m, a pushbroom SWIR radiometer with high spectral resolution, and a whiskbroom-type TIR radiometer with high spatial, spectral, and radiometric resolutions. The preflight performance is evaluated through a protoflight model (PFM)     

Integrated uniplanar microwave part of transmitter-receiver withactive antennas

A new concept, design and realisation of an integrated uniplanar microwave part of a transmitter-receiver with active antennas is presented. All circuits are realised using the three coplanar strips technique (TCS). The whole subsystem is realised with one low cost MESFET (NE72089A). The common oscillator has an electronically controlled frequency. The model is realised at a transmitting frequency of 9.5 GHz. The transmitter power is 11 dBm and the mixer isotropic conversion loss is 1.5 dB. The local oscillator signal level (in the gate circuit) is ~9 dBm. The total oscillator DC to RF efficiency is 22.2%. The concept and design can be applied to higher microwave and millimetre-wave frequencies     

区域超声影像远程会诊网络平台的构建及质量控制

远程医学会诊网络系统基本包括3大系统：远程疑难病会诊系统，远程影像学会诊系统及远程病理学会诊系统。本文重点论述远程影像学会诊系统——超声影像远程会诊网络平台的设计、构建实施及会诊质量控制。