基于LDAP的统一身份认证系统的设计

介绍了目录服务的概念和功能,论述了目录服务与LDAP之间的关系以及LDAP的工作原理和实现方法,分析了LDAP的4种基本模型及功能模块之间的关系,给出了基于LDAP的统一身份认证系统的设计思想和实现方法,为各类信息平台的建设和资源整合提供了思路和方案。     

基于LDAP的Web身份认证机制的研究与实现

介绍了LDAP协议和目录服务,并详细阐述了基于LDAP的认证机制和认证方式。对基于LDAP的4种认证方式的认证原理和实现过程进行了分析,并对认证过程进行了详细的阐述,最后给出了LDAP在Web应用系统中认证方式的实现。     

LDAP目录服务在综合评价决策模型库中的应用

综合评价决策模型库目录管理系统CEM-DMS由若干分布式异构子系统构成,对模型库各子系统中存储的信息进行整合,形成了完整的模型库系统.给出了基于LDAP的数据存储解决方案,采用基于Web和LDAP目录服务实现了系统中模型数据和评价信息的组织与定位以及各子系统中算法信息的发布功能.目录服务采用＂全局-局部＂的方式管理资源信息,提高了系统的扩展性和可靠性.     

基于LDAP的公共信息模型存储设计

公共信息模型(CIM)是近年由分布管理任务组(DMTF)负责制定的来解决网络管理元素的互操作性,LDAP是事实上的目录协议标准。文章在介绍了CIM和轻量级目录访问协议(LDAP)的相关概念的基础上,提出了基于LDAP的CIM的存储详细设计方案。     

LDAP目录服务的研究及其在Intemet上的实现

轻量级目录访问协议（LDAP）是一个运行在TCP/IP上有目录取协议，存取目录采用的是客户机/服务器的模式，最初作为X.500目录服务协议的前端程序，用于独立的或其它类型的目录服务器之中。因此在介绍LDAP目录服务器的定义、背景和原理的基础上，通过实例介绍了如何在linux下建立、配置和操作OPENLDAP软件来提供目录服务的问题。     

基于移动Agent的网格资源管理研究

在对网格进行分簇的基础上,提出了一种将网格资源被动发现与主动查找相结合的基于移动Agent的网格资源管理模型．通过使用移动Agent技术进行网格资源信息的初步收集,将收集到的资源信息保存到当前簇内的LDAP目录服务器中,并将当前簇的资源信息的摘要保存到邻簇的LDAP目录服务器中,在对资源进行主动查找和调度时采用之前保存的摘要信息作为资源查找算法的启发因子,从而加快网格资源的发现速度,进而提高网格使用效率．仿真实验验证了该模型中关键算法的有效性,论证了模型的可用性．     

LDAP目录服务在统一身份认证系统中的应用

介绍了LDAP目录服务的概况，将其应用到统一身份认证系统的设计之中，对该系统中LDAP的模式设计、目录树设计、功能实现、安全模型等作了简要说明。     

LDAP协议及其在PKI中的实现

本文较为详细地介绍了LDAP协议，并根据作者自身的实际经验，简单介绍LDAP的应用范围，详细讲述LDAP目录服务在PKI系统中的应用实现，为需要了解或开发LDAP目录服务和PKI系统的读者提供一简要的参考。     

基于CAS的单点登录系统应用研究

随着信息系统的迅速发展,各类信息化应用系统逐步建立,但是各应用系统之间自成体系,从而导致了每使用一个系统就要重新登录一次,给用户的使用和管理员的管理带来了很多不便.本文研究基于CAS的单点登录系统应用,很好地解决了使用和管理困难问题,介绍了基于CAS的单点登录系统应用设计研究,系统采用用户管理LDAP轻量级目录服务、CAS中央认证服务,设计了一个统一管理界面,通过Web服务传递用户参数,实现了多应用系统的整合.     

基于目录服务的地址解析技术

地址解析是软交换网络组网的重要技术，在分析各种软交换网络地址特点的基础上，给出了基于目录服务的地址解析的一般方法，然后详细阐述了轻量级目录访问协议（LDAP）地址解析系统的结构和技术，最后简要讨论了已成为国际上研究热点的电话号码映射（ENUM）解析技术。     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

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.