基于巴特沃斯逼近的二维IIR数字滤波器的设计

本文给出了一种基于巴特沃斯逼近的二维ＩＩＲ数字滤波器的设计方法，得到了由基本的全通节级联，并联实现的各种二维滤波器函数，包括，镜象对称互补滤波器，扇形滤波器和具有任意矩形通、阻带的滤波器，结果表明，这种实现结构具有通有灵敏度低、滤波器系数少的优点，并且由于巴特沃斯逼近的最大平坦性，得到的滤波器具有良好的相位特性。     

电镜扫描偏转系统的计算机辅助设计

实验表明，磁芯对空芯扫描偏转线圈空间磁场分布的影响在两者几何尺寸偏离不大时可以忽略。可以用空芯偏转线圈的磁场分布来计算电子在扫描偏转系统中的轨迹，并根据其光栅的畸变情况来调整和确定匝数分布，从而使工程设计更为简便和准确。     

Design of testable sequential circuits by repositioning flip-flops

This paper presents a technique to enhance the testability of sequential circuits by repositioning flip-flops. A novel retiming for testability technique is proposed that reduces cycle lengths in the dependency graph, converts sequential redundancies into combinational redundancies, and yields retimed circuits that usually require fewer scan flip-flops to break all cycles (except self-loops) as compared to the original circuit. Our technique is based on a new minimum cost flow formulation that simultaneously considers the interactions among all strongly connected components (SCCs) of the circuit graph to minimize the number of flip-flops in the SCCs. A circuit graph has a vertex for every gate, primary input and primary output. If gatea has a fanout to gateb, then the circuit graph has an arc from vertexa to vertexb. Experimental results on several large sequential circuits demonstrate the effectiveness of the proposed retiming for testability technique in reducing the number of partial scan flip-flops.     

单片视频D／A转换器SDA1016的电路分析与设计

对单片视频Ｄ／Ａ转换器ＳＤＡ１０１６进行了电路原理分析和优化设计，该结果可作为电路研制及应用的参考。给出了ＳＤＡ１０１６视频ＤＡＣ的复合视频应用电路。采用了某些模拟技术，实现了ＳＤＡ１０１６全直流分析、子电路（块）的瞬态分析，是ＳＰＩＣＥ用于ＬＳＩ电路分析和优化设计的成功例证。     

Distributed automated docking of flexible ligands to proteins: Parallel applications of AutoDock 2.4

Summary AutoDock 2.4 predicts the bound conformations of a small, flexible ligand to a nonflexible macromolecular target of known structure. The technique combines simulated annealing for conformation searching with a rapid grid-based method of energy evaluation based on the AMBER force field. AutoDock has been optimized in performance without sacrificing accuracy; it incorporates many enhancements and additions, including an intuitive interface. We have developed a set of tools for launching and analyzing many independent docking jobs in parallel on a heterogeneous network of UNIX-based workstations. This paper describes the current release, and the results of a suite of diverse test systems. We also present the results of a systematic investigation into the effects of varying simulated-annealing parameters on molecular docking. We show that even for ligands with a large number of degrees of freedom, root-mean-square deviations of less than 1 Å from the crystallographic conformation are obtained for the lowest-energy dockings, although fewer dockings find the crystallographic conformation when there are more degrees of freedom.The AutoDock 2.4 suite is written in ANSI C, and is supplied with Makefiles for the following platforms: Convex, DEC Alpha OSF/1, Hewlett-Packard Precision Architecture, Silicon Graphics, and Sun. The AutoDock suite of programs is freely available to the noncommercial scientific community and to educational establishments. Further information, including additional figures and MPEG animations showing all docked conformations for each test system, can be found at the following URL: http://www.scripps.edu/pub/olson-web/doc/autodock.     

世妇会IBC电视转播系统设计

本文作者参与了世妇会ＩＢＣ电视转播系统的设计，施工，测试及运行的全部过程，文章详细介绍了系统的总体要求，基本方案，设计及运行，以及由此得出的几点经验。     

循环移位可编程序逻辑阵列的可测试性设计

本文研究了一种“芯片内部自测式”可编程序逻辑阵列(Built-in Sclf Tcst PLA)的设计方法:循环移位PLA(简称CS-PLA)法.CS-PLA与其他PLA可测试性设计方法相比,具有故障覆盖率高、对电路速度影响小、测试生成简单等特点,当PLA嵌入在芯片内部时,不需要单独的测试状态。其芯片面积成本随PLA的规模增大而降低,因此CS-PLA特别适用于大规模“嵌入式”PLA.     

Fundamentals of optical design in rotating mirror cameras

The elementary optics of rotating-mirror high-speed cameras are analysed geometrically. The images in an off-axis scanning mirror are shown to lie on Pascal's limacon. The Miller principle by which shuttering is accomplished is described. A simple estimate of motion blurring is compared with the Rayleigh criterion.     

Pattern recognition display methods for the analysis of computed molecular properties

Summary Pattern recognition methods, particularly the unsupervised learning techniques, are well suited for the preliminary analysis of the large data sets produced by computer chemistry. The use of linear and non-linear display methods for such exploratory analysis are exemplified with the aid of two data sets of biologically active molecules. Advantages and disadvantages of these techniques are discussed.     

用于投影显示的分色合色膜系的消偏振设计

由于斜入射时,光学薄膜存在一定的偏振效应,将产生S-和P-偏振光的光谱分离.在Philips棱镜系统中,分色合色膜系通常分色时对S-光应用,合色时则对P-光应用.从提高光能利用率、减少杂散光和增加系统对比度等因素综合考虑,要求分色合色膜系的S-和P-偏振光的分离尽可能小.新设计方法采用宽带法布里－珀罗薄膜干涉滤光片中心波长两侧的干涉带作为长波通或短波通截止滤光片,可实现S-和P-偏振分量的分离几乎为零.