SPC3在现场总线智能从站设计中的应用

工控现场设备与总线相连,实现现场总线分布式控制离不开Profibus接口.介绍了Profibus现场总线的基本特征和智能从站通讯接口芯片SPC3,阐述了SPC3与AT89C52的接口设计和智能从站的软件设计.以SPC3芯片为核心开发的智能从站能很好地实现数据的采集和控制,在工控现场具有广泛的应用前景.     

浅谈SPC的有效实施

SPC已经成为许多国际性企业广泛采用的质量管理和改善的技术和方法，本文通过对SPC方法进行说明，论述了采用SPC的好处，并重点分析讨论了企业中不能有效实施SPC的原因以及如何才能够达到SPC有效实施。     

基于C167的PROFIBUS-DP智能从站的设计

设计了基于C167的PROFIBUS—DP总线协议的智能从站。依据系统所要实现的功能,提出了使用PRO—FIBUS—DP协议智能接口芯片SPC3和软件的实现方案。以C167与SPC3为核心设计了其软硬件系统,经调试满足了设计要求,目前已在实际工程中得到应用。     

PROFIBUS中智能芯片SPC3的应用

介绍了一种现场总线-PROFIBUS(Process Field Bus即过程现场总线),着重描述它的优点；重点针对西门子公司的智能芯片SPC3做了详尽描述。同时，在烟机电控系统中成功地应用SPC3构成PROFIBUS--DP主、从站进行数据通讯。     

基于SPC3的PROFIBUS-DP智能从站研究

本文研究了一种基于SPC3的桥梁健康监测PROFIBUS-DP智能从站。该从站采用协议处理芯片SPC3实现从站接口协议,由片上系统C8051F020控制从站的总体运行。从站解决了当前桥梁健康监测系统的可靠性和开放性差、数据传输速率低、布线复杂等问题。     

基于PROFIBUS的智能接口芯片SPC3及其应用

SPC3是一种用于PROFIBUS—DP开放式工业现场总线智能化接口芯片，可广泛用于工业自支化和楼宇管理自动化中的单片机接口。文中利用SPC3可与PROFIBUS现场总线、RS-485总线等进行接口的优点，给出了一种提高数据采集与监控系统效率的实现方法。     

SPC参数控制限和规范限的定义

介绍了定义SPC控制限和规范限的一套方法.在多品种小批量的化合物半导体前道工艺线推行SPC的过程中,针对不同参数的性质不同,分别总结出了三种不同的定义方法,从而对前道工艺流程的全部参数实行了SPC监控,并在实际的控制中证明该方法是有效的.该方法解决了困扰SPC使用者如何定义控制限和规范限的难题,尤其对于刚开始推行SPC的生产线有借鉴意义.     

A0I与SPC的结合使PCB组装最佳化

本文简要叙述了AOI和SPC的融合，功能性，AOI系统，SPC优越性以及把AOI和SPC集成化形成一个综合性的体系，即把组装缺陷的在线检查与实时统计分析紧密地结合起来的体系。     

统计过程控制在成膜工序的应用

本文从厚膜混合集成电路生产线应用SPC技术的意义入手,结合SPC技术原理、厚膜成膜的工艺特点,论述了厚膜混合集成电路成膜工序实施SPC技术的方法。     

关于ASU单板资源耗尽隐患案例的排查报告

华为V200R008C02SPC123版本UMG8900与V400R005C00SPC600版本RNC对接时，可能出现ASU单板资源耗尽，3G呼叫分配不到资源而导致呼叫异常。本文通过分析两设备信令对接时ASU板memory资源将出现吊死的情况，当memory资源耗尽的时候可能导致3G通话困难，该现象是TD RNC版本升级到V400R005C00SPC600后出现的，对ASU板进行主备倒换后可以暂时规避该问题，但需要补丁才能彻底解决。确定了联合设备厂家进行优化的措施，从而解决了该故障隐患。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

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.     

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.     

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.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks