SpecSyn: an environment supporting the specify-explore-refineparadigm for hardware/software system design

System-level design issues are gaining increasing attention, as behavioral synthesis tools and methodologies mature. We present the SpecSyn system-level design environment, which supports the new specify-explore-refine (SER) design paradigm. This three-step approach to design includes precise specification of system functionality, rapid exploration of numerous system-level design options, and refinement of the specification into one reflecting the chosen option. A system-level design option consists of an allocation of system components, such as standard and custom processors, memories, and buses, and a partitioning of functionality among those components. After refinement, the functionality assigned to each component can then he synthesized to hardware or compiled to software. We describe the issues and approaches for each part of the SpecSyn environment. The new paradigm and environment are expected to lead to a more than ten times reduction in design time, and our experiments support this expectation     

vBNS: not your father's Internet

The very-high-performance Backbone Network Service (vBNS) is an important part of ongoing efforts by government, industry, and academia to push the state of the art in Internet technologies and academic research applications. It is dedicated to serving research and education institutions whose scientific endeavors require networking performance not possible or not practical with commercial network services. Currently, the vBNS is implemented as an IP-over-ATM network-that is, its network layer (layer 3 of the open systems interconnection reference model promulgated by the International Organization for Standardization) runs the Internet Protocol on top of the asynchronous transfer mode protocol. Those protocols, in turn, run on a synchronous optical network (Sonet) OC-12-622.08-Mb/s-infrastructure. Though access was originally limited to five supercomputer centers and four network access points, the National Science Foundation's High-Performance Connections program is now expanding the vBNS to reach over 100 institutions. The vBNS also has connections to other research networks, both within the United States and abroad. Before describing the architecture of the vBNS, the services it provides, and the metrics developed to assess its performance, the article reviews the background against which it came into being. It also briefly discusses how the vBNS relates to the Next Generation Internet (NGI) and Internet2     

A 200-MHz complex number multiplier using redundant binaryarithmetic

Modern digital communication systems rely heavily on baseband signal processing for in-phase and quadrature (I-Q) channels, and complex number processing in low-voltage CMOS has become a necessity for channel equalization, timing recovery, modulation, and demodulation. In this work, redundant binary (RB) arithmetic is applied to complex number multiplication for the first time so that an N-bit parallel complex number multiplier can be reduced to two RE multiplications (i.e., an addition of N RB partial products) corresponding to real and imaginary parts, respectively. This efficient RE encoding scheme proposed can generate RB partial products with no additional hardware and delay overheads. A prototype 8-bit complex number multiplier containing 11.5 K transistors is integrated on 1.05×1.33 mm² using 0.8 μm CMOS. The chip consumes 90 mW with 2.5 V supply when clocked at 200 MHz     

Solution of combined-field integral equation using multilevel fastmultipole algorithm for scattering by homogeneous bodies

We present an accurate method of moments (MoM) solution of the combined field integral equation (CFIE) using the multilevel fast multipole algorithm (MLFMA) for scattering by large, three-dimensional (3-D), arbitrarily shaped, homogeneous objects. We first investigate several different MoM formulations of the CFIE and propose a new formulation, which is both accurate and free of interior resonances. We then employ the MLFMA to significantly reduce the memory requirement and computational complexity of the MoM solution. Numerical results are presented to demonstrate the accuracy and capability of the proposed method. The method can be extended in a straightforward manner to scatterers composed of different homogeneous dielectric and conducting objects     

三乙胺分子的共振增强多光子电离解离通道研究

利用ＴＯＦ质谱装置对三乙胺分子在和两谱区进行了共振增强多光子电离解离研究。质谱中除有极强的母体离子１０１＾＋和母体上甲基的８６＾＋峰外，还检测到明显的５８＾＋，４２＾＋，３０＾＋，２９＾＋，３０＾＋，２９＾＋，２８＾＋，２６＾＋，２７＾＋和较弱的７２＾＋，７０＾＋，５６＾＋，４４＾＋，１５＾＋，１２＾＋等峰，并与电子轰击谱进行了对照。     

有机发光器件平板显示及彩色象元实现方案

有机发光器件（OLED）具有固体平板化的优点，用OLED制做平板显示器不仅重量轻和功耗低，而且能实现低成本的彩色大屏幕显示。本文从有机发光器件的原理出发，阐述了有机发光器件平板显示器的三色象元的一些实现方案和目前的发展状况，并对它们的基本结构及技术特点进行了比较。     

逻辑函数化简语义树

提出了一种逻辑函数化简语义树算法，其特点是在求全部本源蕴涵项和从本源蕴函项集合中选取最小覆盖两步中都采用同一算法，因此，算法程序的编写可较为简单，最后，从解题质量和解题速度等方面对该算法进行了评价。     

1.30μmDFB激光器组件的设计和制做及其工作原理

本文自行设计和制作了１．３０μｍＤＦＢ激光器组件的讨论了光隔离和光耦合原理。由于采用的激光器－光隔离器－光纤的一体化结构，大大增加了该组件的可用性。在实验中得到高达５５％的耦合效率。     

用介电函数的三级微商谱精确确定GaxIn1—xP临界点的能量值

本文导出了弱电场则反射谱与电函数对能量的三级微商成正比。将ＭＯＣＶＤ方法生长的ＧａＩｎＰ以及掺Ｓｉ和掺Ｚｎ３个样品，用椭圆偏振光谱法测量得到了可见光区的介电函数谱，并求其三级微商谱，把用一分析电反射谱的三点法推广到分析介电函数的三级微商谱，得到弱电场调制反射谱的实验结果，并与介电函数谱的结果加以比较，使灵敏度和分辨率有很大提高。     

B—ISDN宽带UNI信令点到多点配置的实现

本文根据ＩＴＵ－Ｔ最新的Ｑ．２９７１协议，以及笔者所从事的实际课题，提出一整套Ｂ－ＩＳＤＮ第三层ＵＮＩ信令的软件实现策略，其特点是能同时满足用户对点到点以及点到多点广播这两种通信方式的要求，而且可以动态配置。