基于S3C2440的总线式远程工业操控平台的设计

为了实现对工业现场进行远程监控的需要,设计了基于S3C2440处理器的通用远程工业现场参数监控的平台,对该平台所采用的命令/数据传输算法和界面树链表交互算法进行研究。使用S3C2440处理器直接驱动TFT液晶屏和四线电阻触摸屏建立硬件平台,自主设计需要的监控界面组成树链表,并按照互关联算法关联命令和数据,通过RS485接口与现场的设备进行通信。测试结果表明,使用该平台设计的远程电流-温度监控平台,利用RS485接口连接采集设备,通过触屏传输命令,完成数据显示更新,与传统的监控方法相比具有开发简单,使用简便,通用性好,成本低廉的优点,特别是随着参数个数增加,其成本可减少到传统方法的5%以下。该平台基本满足多种场合远程监控工业现场的需要。     

GDB RSP协议与USB通信在嵌入式调试系统中的应用

对于嵌入式系统开发来说,远程调试器非常重要,而GDB RSP协议与USB通信一般在嵌入式调试系统中占有重要位置。文章在研究GDB RSP协议与USB通信的基础上,针对ZW100 DSP处理器的体系架构,给出了一种基于RSP命令交互与USB数据通信实现硬件仿真器与PC端调试软件进行调试信息交互的开发与实现方法。该设计实现了GDB通过硬件仿真器下载程序到目标板进行开发调试的功能,使得开发简洁便利,缩短了研发周期。     

自主识别加油嵌入式系统的设计

针对日益增长的加油供给站需求以及传统人工加油效率低等问题，文中设计了一种基于STM32的自主识别加油嵌入式系统。该系统利用OpenMV采集特征检测数据，获取目标油箱口的图像特征值，控制云台的及时追踪；通过WIFI串口模块连接物联网平台，完成物联网平台与单片机的数据交互；通过手机端APP用户的操作，实现该系统的远程控制；利用GSM通信模块实现人工客服功能，保障自主加油系统的安全性，并通过OLED显示屏完善系统的人机交互。该设计以STM32F407ZGT6为主控芯片，完成了所有功能模块的通信和数据交互，实现了自主识别加油功能，解决了传统加油面临的安全隐患，显著提升了加油操作效率和可靠性，解放了一线工作人员。     

基于B/S结构的多终端交互式幻灯片演示系统

为了满足大型多媒体教学的需求,针对传统PPT幻灯片演示的局限性,设计并实现一种基于B/S结构的交互式幻灯片演示系统。该系统能对已有PPT文件进行解析与转换,在演示过程中可以通过主控端控制多台从控端幻灯片的同步播放,支持师生间文字、语音和电子白板交互,为多媒体教学提供方便。实际测试与应用结果表明,该系统可以便捷完成多媒体幻灯片在多终端上的演示和交互,具有良好的跨平台和实时交互性,对当前多媒体教学具有指导性意义。     

基于全球区域网络的通信系统设计

基于宽带全球区域网络的综合通信系统的总体设计方案,是以Microsoft Visual Studio 2005作为开发平台,使用Visual C＋＋语言开发的Windows桌面应用系统。系统采用Windows Sockets网络编程接口（WinSock API）构建了移动终端与中心主控端之间的通信和控制平台,实现了卫星网络接入终端管控、语音通话、远程电子白板等功能。该方案是结合卫星通信的优势,将卫星通信网络作为移动终端客户端与中心主控端服务器的信息交互平台。设计和实现了基于卫星移动通信网络的综合通信系统,该系统可应用在生产安全、防洪抢险、抗震救灾、野外勘察、指挥处理突发公共事件等领域,并将在这些领域发挥重要作用。     

通用光伏系统测试平台的设计

为了统一光伏系统测试方案,避免项目管理混乱和不必要的重复设计等问题,提出了一种通用光伏系统测试平台,制定了光伏系统与PC软件端数据交互协议,实现了用来获取常用光伏系统测试参数及具有良好扩张性的通用用户监控界面。测试结果表明,该测试平台很好地解决了上述问题,从而缩短了系统设计周期。     

实时OFDM-PON系统帧同步的设计与实现

利用Xilinx公司的现场可编程门阵列(FPGA)实现了一种简单的OFDM-PON实时系统帧同步算法。通过对帧同步模块的功能仿真验证和硬件资源消耗的分析,该算法具有准确性高、易实现和资源消耗少等优点。在OFDM-PON点对点实时系统中运用了该同步算法,在25km标准单模光纤上能够实时传输3.5Gb/s 64-QAM编码的光OFDM信号,误码率可以达到1.0×10-6。     

基于GPU加速的改进的光线投射算法研究

传统的医学图像体绘制算法大多通过CPU端实现,为解决传统算法存在绘制时间较长,交互不够流畅,且使用平台单一等问题,提出了一种基于图形处理器(GPU)的医学序列影像的实时体绘制技术。通过对不透明度值设置阈值,提前终止光线计算,并在光线遍历体数据时,调整采样间距,改进了光线投射算法。实验结果表明,对其中一组最大数据(931张切片)的绘制时间为1.3 s左右,交互时的绘制帧数在20~40之间。在绘制时间方面,不仅比传统的基于CPU的算法有大幅度提高,相比于前人的基于GPU的算法也有明显改进,加速比可以达到1.5左右。     

自由空间激光通信捕获控制系统

为了完成快速高概率的捕获,设计并构建了自由空间激光通信捕获控制系统,主要由主控计算机、GPS/INS捷联导航系统、数传电台和控制软件等部分组成.主控计算机采用嵌入式操作系统Windows CE,控制系统采用多线程同步技术和事件驱动方式处理多个通信串口的数据,减少了处理数据的延迟时间;同时,系统采用快速高精度指向算法,实现高精度的粗对准;使用复合光栅螺旋扫描方式和可对速度补偿的捕获算法,减少了捕获时间,提高了捕获概率.基于野外试验数据对捕获控制系统性能进行分析评估.结果表明,系统指向误差小于1°,捕获时间小于30 s.目前,该系统已经研制完成并投入使用,效果良好.     

基于加密通信技术的电网调度指令开放共享与智能交互系统

针对传统集中式电力系统在组织、运行方式以及对电网调度通信安全等方面的需求日益增加的问题。文中提出一种ECC-AES混合加密算法,设计通信架构,并在嵌入式平台进行实现。该算法的时间成本大约保持在70 ms以内,可以有效满足主电网的通信需求。将文中算法与wNAF传统加密算法和MBNS算法进行比较,结果表明,该算法具有良好的正确性、可靠性及高效性。在应用加密技术确保网络安全的基础上,搭建网络一体化平台,并建立电网指令交互模型,确保电网指令交互的适用度与实用化。     

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.     

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.     

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.     

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.     

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.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.