虚拟实验室的虚拟仪器开发

虚拟仪器在很多行业中都有广泛的应用,而基于虚拟仪器的虚拟实验室和被越来越多的高校所采用,在很大程度上提高了教学质量,节约了成本,本文以电路过渡过程监测仪的开发为例,揭示了虚拟仪器和虚拟实验室的开发过程中的问题和解决方式.     

电视机的虚拟开发与设计(二)——连接导线及机壳的虚拟开发

本文结合虚拟现实技术的设计与开发过程,对虚拟电视机中的连接导线和电视机外壳等基本结构要素进行了场景开发、动画控制和交互操作,并给出了大量的过程资料和效果图,对于电视机的开发具有一定的借鉴作用。     

基于virtools的虚拟实验开发

结合日常教学对虚拟实验的需要和当前虚拟实验开发现状,简要介绍了一款虚拟实现设计开发平台Virtools,以及在该平台下进行虚拟实验开发的步骤。提出将MultiGen Creator模型应用于该平台的思路,并对在开发过程中应当注意的问题进行了探讨。     

网上虚拟实验室的开发

多媒体技术（MT）和信息技术（IT）为教学、实验、实训的发展带来了新的契机，同时也为高等教育的现代化带来新的机遇，需求、和挑战，目前各院校都在开发虚拟实验平台，本文结合我们近期开发情况，介绍网上虚拟实验室的意义，开发的技术，基本体系结构，开发思路，设计过程。     

电视机的虚拟开发与设计（一）--电子元器件的虚拟开发设计

本文主要应用虚拟技术对电视机进行开发,在设计和开发过程中,主要对电视机的基本结构如电视机外壳、电子元器件、连接导线和PCB等结构要素进行交互操作、场景开发和动画控制,给出了详细的开发过程和开发效果图,对于电视机的开发具有一定的借鉴作用。     

基于HLA的分布式虚拟靶试系统开发研究

高层体系结构(HLA)是目前分布式交互仿真领域最新的通用技术框架,基于HLA的仿真是系统仿真的发展方向。文章结合实例分布式虚拟靶试系统对HLA框架下的仿真系统设计进行深入研究,对本系统的开发环境、设计流程及系统开发实现过程中所需解决的主要关键技术时间同步作了讨论。本项研究对其它领域内基于HLA的联邦设计和开发具有参考价值.     

加速新产品开发的虚拟制造技术

在产品的设计和制作过程中,往往会出现许多意想不到的实际问题,使设计工程师和车间现场的生产管理人员感到很难解决。如果能事先预见到这类问题并作出妥善解决的话,就可避免出现这些问题,从而可以加速新产品的开发并降低生产成本。     

基于ARM的嵌入式虚拟开发平台

为了解决目前大部份高校缺乏嵌入式开发平台的问题,提出了构建嵌入式虚拟开发平台方案.方案采用μVision4IDE和Proteus进行整合,在不需要购置嵌入式硬件设备的情况下,通过改造、整合原有实验设备,实现具有嵌入式系统设计、开发等软、硬件同步仿真调试功能的嵌入式虚拟实验室.同时给出了具体的教学模式革新和实施方法.     

医学虚拟仿真仪器的开发研究

通过对日本Sysmex XE-2100型血细胞分析仪的三维数字化重建和仿真功能开发研究,分析了虚拟现实软件EON Studio的技术特点和软件优势及其在虚拟医学仪器开发中的技术关键。该项研究工作为虚拟现实技术运用于医学教育和培训提供了可借鉴的经验。     

虚拟交通场景编辑平台开发

虚拟交通场景的构建是一项繁琐的工作。在此利用Creator创建基础道路交通场景,并利用Vega虚拟仿真平台,在Visual C^--集成环境下开发了虚拟交通场景编辑系统,用户能够根据自己的需要,自行创建虚拟交通道路、虚拟汽车、交通灯及树木等,利用键盘,可以控制一台虚拟汽车在虚拟交通场景中体验虚拟驾驶过程。     

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.     

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.     

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.