从Web Services到Grid Services

介绍了Web Services和Grid Services两种技术的基本结构,指出了Web Services的优缺点及Grid Services的发展.并对目前比较常见的一种网格结构形式OGSA以及GT3进行了介绍.     

Mobile Web Service于Web 2.0的发展与应用

无线网络技术的进步,使得移动上网由名词变成了动词,而Web 2.0议题开启一股新兴的软件革命,这两波同时兴起的新风潮将使Mobile Web Services成为Web 2.0众技术之一,本文将从移动端的观点简要介绍Web 2.0及Mobile Web Services技术.     

基于Web Services的电子商务应用平台设计与实现

在分析Web Services的体系结构和关键技术的基础上.采用基于J2EE的Web Services技术,结合标准的Web协议(HTTP、SMTP等)和XML、SOAP、WSDL、VDDI等一系列标准.给出了一个企业电子商务应用集成技术的设计与实现.     

基于角色的Web Services访问控制系统

首先对Web Services的安全技术和访问控制的研究情况进行简单回顾,介绍XACML(eXtensibleAcces s Control Markup language)中的常用术语,然后介绍了一个Web Services的面向服务的基于角色的访问控制系统和安全结构模型,从服务方面和属性方面加强对服务的访问控制.在该体系结构模型中,使用SOAPProxy加强对Web Services的访问控制.通过设计安全cookies和安全SOAP消息,在Web Services上实现基于角色的访问控制.最后给出此系统有待解决的问题.     

VRML技术在Web GIS中的应用

本文首先对 VRML 技术在 Web GIS 中应用的基础做了初步的研究与探讨,并介绍了传统的静态 VRML 技术与 Web GIS 技术相结合的技术实现手段。在此基础上,通过对 VRML EAI 技术思想进行分析与研究,提出了一个基于 VRML EAI 的实现动态 VRML 技术与 Web GIS 相结合的新型系统解决方案。     

VRML技术在Web GIS中的应用

本文首先对VRML技术在Web GIS中应用的基础做了初步的研究与探讨,并介绍了传统的静态VRML技术与Web GIS技术相结合的技术实现手段。在此基础上,通过对VRML EAI技术思想进行分析与研究,提出了一个基于VRML EAI的实现动态VRML技术与Web GIS相结合的新型系统解决方案。     

Web Services安全机制研究

Web Services作为实现SOA的主流技术标准,得到了广泛应用,其安全性值得高度关注。基于WS-Security标准,对Web Services的安全机制进行了研究,对Web Services安全防护的功能、遵循的标准进行了分析,并结合工程实践,从身份识别、SOAP消息安全防护和访问控制等方面提出了Web Services安全防护的实现方案,可以实现核心的安全防护功能,对基于Web Services技术架构的系统安全防护具有指导意义。     

基于SOA架构的企业集成系统设计与实现

结合传统企业应用集成(EAI)中存在的问题,分析了SOA和Web服务技术在实现异构系统集成方面的先进性.针对基于SOA思想,以Web服务为基础的异构系统集成解决方案的实现,提出了3种Web服务的构造方法,包括CORBAR,ActiveX以及Java RMI.通过将SOA体系架构应用到企业集成EAI的实例表明,基于SOA架构的集成模式用于解决企业信息集成中相关异构系统之间互操作的问题具有一定优势.     

一种基于有状态Web Services的流媒体发布方案研究与设计

分析了当前流媒体视频发布中的缺陷和不足,针对目前流媒体发布的现状,结合Web Services技术,提出并有效地实现了一种跨平台、与开发语言无关的无缝集成系统解决方案,并为Web Services加入了有状态的特征.同时结合SMIL的功能,使其能够保存用户的行为状态,克服了Web Services无状态的不足,为用户提供了个性化的服务,具有很强的灵活性和可扩充性,并易于维护.     

基于Web Services的Parlay API分析研究

Parlay API是网络能力开放接口的代表，它的实现需要底层分布式通信平台的支持。Web Services作为一种新的分布式通信平台，具有和CORBA等分布式对象系统不一样的技术特点，基于Web Services的Parhy API体现了电信网和Internet的融合。总结了Web services在Parlay中的应用，在对Parlay API和Web Services进行技术分析的基础上详细研究了基于Web Services的Parlay API交互机制等问题。     

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.     

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.     

GaAsSb/InAlAs PA DHBTs Grown by Production MBE

The epi material growth of GaAsSb based DHBTs with InAlAs emitters are investigated using a 4 × 100mm multi-wafer production Riber 49 MBE reactor fully equipped with real-time in-situ sensors including an absorption band edge spectroscope and an optical-based flux monitor. The state-of-the-art hole mobilities are obtained from 100nm thick carbon-doped GaAsSb. A Sb composition variation of less than ± 0.1 atomic percent across a 4 × 100mm platen configuration has been achieved. The large area InAlAs/GaAsSb/InP DHBT device demonstrates excellent DC characteristics,such as BVCEO＞6V and a DC current gain of 45 at 1kA/cm2 for an emitter size of 50μm × 50μm. The devices have a 40nm thick GaAsSb base with p-doping of 4. 5 × 1019cm-3 . Devices with an emitter size of 4μm × 30μm have a current gain variation less than 2% across the fully processed 100mm wafer. ft and fmax are over 50GHz,with a power efficiency of 50% ,which are comparable to standard power GaAs HBT results. These results demonstrate the potential application of GaAsSb/InP DHBT for power amplifiers and the feasibility of multi-wafer MBE for mass production of GaAsSb-based HBTs.     

Influence of polarization extinction ratio on distributed polarization coupling detection

Distributed polarization coupling in polarization-maintaining fibers can be detected by using a white light Michelson interferometer. This technique usually requires that only one polarization mode is excited. However, in practical measurement, the injection polarization direction could not be exactly aligned to one of the principal axes of the PMF, so the influence of the polarization extinction ratio should be considered. Based on the polarization coupling theory, the influence of the incident polarization extinction on the measurement result is evaluated and analyzed, and a method for distributed polarization coupling detection is developed when both two orthogonal eigenmodes are excited.     

Noise character analysis and the restraint of self-pulsation laser diodes

We calculate the Langevin noise sources of self-pulsation laser diodes, analyze the effects of active region noise and saturable-absorption region noise on the power fluctuation as well as period fluctuation, and propose a novel method to restrain the noise effects. A visible SIMULINK model is established to simulate the system, The results indicate that the effects of noise in absorption region can be ignored; that with the increase of DC injecting current, the noise effects enhance power jitter, and nevertheless, the period jitter is decreased; and that with external sinusoidal current modulating the self-pulsation laser diode, the noise-induced power jitter and period jitter can be suppressed greatly. This work is valuable for clock recovery in all-optical network.     

High-quality single-crystal CdSe nanoribbons and their optical properties

Large-scale synthesis of single-crystal CdSe nanoribbons is achieved by a modified thermal evaporation method, in which two-step-thermal-evaporation is used to control CdSe sources＇ evaporation. The synthesized CdSe nanoribbons are usually several micrometers in width, 50 nm in thickness, and tens to several hundred micrometers in length. Studies have shown that high-quality CdSe nanoribbons with regular shapes can be obtained by this method. Room-temperature photolumines-cence indicates that the lasing emission at 710 nm has been observed under optical pumping （266 nm） at power densities of 25-153 kW/cm^2. The full width half maximum （FWHM） of the lasing mode is 0.67 nm     

Propagation of hermite-cosh-gaussian beams passing through ABCD optical system with an annular aperture

By using the expansion of the aperture function into a finte sum of complex Gaussian functions, the corresponding analytical expressions of Hermite-cosh-Gaussian beams passing through annular apertured paraxially and symmetrically optical systems written in terms of ABCD matrix were derived, and they could reduce to the cases with squared aperture. In a similar way, the corresponding analytical expressions of cosh-Gaussian beams through annular apertured ABCD matrix were also given. The method could save more calculation time than that by using the diffraction integral formula directly.     

中国建立EB级存储实验室,致力云计算应用(英文)

正With the support of 863 programs,Sugon Information Industry Co.,Ltd.,set up a dawning EB-class storage laboratory to address massive data storage requirements and largescale cloud computing demonstration applications.The Dawning EB-class cloud storage system adopts advanced fault-tolerant architecture,efficient data fault-tolerant algorithms with user authentication and data encryption policies to deal with the"lost""wrong"and"stolen"problems of data for ensuring the reliability and safety of the EB-class storage system in the public network application environments.The Dawning EB-class Storage Laboratory taking advan-