一种分布式的学生公寓安全状况监测系统

针对国内学生公寓安全状况,提出了一种基于控制器局域网络(CAN)总线的分布式监测系统,给出了系统的总体模块结构,在简单介绍CAN总线控制器SJA1000的基础上,重点阐述了系统控制单元部分的设计,包括微处理器模块和CAN控制模块,给出了系统工作的软件实现流程图。试验证明,该系统可靠性强,软硬件开发容易,具有一定的参考使用价值。     

数字电视系统中应急广播适配设备的设计和实现

本文结合数字电视系统的特点,全面分析了将应急广播适配到数字电视系统中的各种方法,提出了一套完整的数字电视应急广播适配方案,然后基于该方案完成了数字电视应急广播适配器的需求分析、软硬件平台选型、FPGA内部设计、适配器的软件设计和实现等工作.适配器的硬件基于SAMSUNG公司ARM芯片S3C2440开发,软件平台使用了微软的Wince5.0操作系统,软件部分的工作包括适配器用来接收和发送码流的FPGA驱动程序设计和应用程序的开发.最后搭建仿真实验环境对适配器进行测试,从而论证了课题的研究成果.     

多通道PXI总线数据采集系统设计

本文主要针对导弹测试系统中多通道数据采集的任务,提出了基于FPGA平台的PXI总线接口通用设计方案,并实现了PXI总线接口模块的电路设计和驱动程序的开发。然后根据PXI总线体系的要求,完成了32通道数据采集系统硬件设计和仪器软面板设计。该方案的成功实现对于组建自定义的总线化测试系统具有十分重要的意义,标志着自主化的PXI总线接口关键技术的突破。     

基于企业服务总线的信息共享交换平台研究

为了实现企业数据共享和应用集成,提出了一种基于企业服务总线(ESB)的信息共享交换平台.该平台采用面向服务体系结构(SOA)的设计思想,以信息共享为目标,具有松散耦合的特点,实现了"集中式管理、分布式运行"的工作模式.通过设计标准的适配器组件,实现各种数据库和应用系统之间的数据共享与交换.实验表明该设计方案能有效实现企业中信息共享,并具有良好的可扩展性和可靠性.     

基于Linux的煤矿安全生产实时监测系统的设计

CAN—bus是一种性价比非常高能的能有效支持分布式控制和实时控制的串行通信总线。据煤矿安全监控系统实时通信要求高的特点．提出了一种基于Linux平台CAN—bus的煤矿安全生产实时监测系统，描述了Linux下该系统的实现方案和关键技术。     

基于EtherCAT和CAN总线的柔性工装控制系统

针对柔性工装在成形过程中存在参数复杂、被控伺服电机数量多及其多个移动横梁之间分散式布置等问题,提出了基于EtherCAT和CAN总线技术的分布式网络控制方案,阐述了柔性工装工作原理,研究了以PC和PLC为核心的硬件整体结构,并利用VC++软件完成了人机交互界面的开发。该系统中,上位机与控制柜内分站模块组、控制柜内分站模块组及移动横梁上的分站模块组、各个移动横梁之间的模块组采用EtherCAT总线通信;移动横梁上的分站模块组与伺服电机、各个伺服电机之间采用CAN总线通信,两种总线高低结合进行数据传输,使传输速率提高将近10倍。     

多通道RXI总线数据采集系统设计

本文主要针对导弹测试系统中多通道数据采集的任务,提出了基于FPGA平台的PXI总线接口通用设计方案,并实现了PXI总线接口模块的电路设计和驱动程序的开发.然后根据PXI总线体系的要求,完成了32通道数据采集系统硬件设计和仪器软面板设计.该方案的成功实现对于组建自定义的总线化测试系统具有十分重要的意义,标志着自主化的PXI总线接口关键技术的突破.     

一种多功能电子测量仪研究

结合设计和开发,介绍了利用DSP技术实现多功能电子测量仪的硬件和软件。硬件采用总线技术,数据采集模块可以插件的形式灵活地配置总线上;软件采用平台化的设计技术,整个软件分为支持层、调度操作层和应用层;所设计的网络接口能和计算机连接以实现虚拟仪器功能。实现表明。采用DSP技术和虚拟仪器技术结合的电子测量仪具有较好的扩展功能和开放功能。     

基于HLA分布式实时仿真系统中软总线设计

针对多个不同侧重点的仿真软件进行协同联合仿真的需求问题,文中对常见的几种HLA/RTI架构进行分析,结合实际项目需求,提出一种较高性能的轻量级低耦合RTI软件架构,基于该软件架构设计并实现分布式实时仿真系统中的软总线。目前使用该软总线的分布式实时仿真平台已投入实际的科研工作中。     

综合业务接入平台的一种实现方法

为支持综合业务,研究了综合业务接入平台的技术体制,提出了基于ATM及STM技术实现的可行性及必要性内部信号结构采用ATM信元共享总线及ST-BUS双总线方式;介绍了实现该平台的硬件及软件组成,重点描述了用于该平台的路由协议及时钟方式。     

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.     

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.     

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.     

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.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

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.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.