基于RFID的员工考勤系统设计

系统的硬件电路以51单片机为控制核心,使用FM1702读卡器模块读取刷卡人员的信息并将其传至单片机,通过串口能够将刷卡信息传至上位机。系统的上位机采用客户端/服务器模式,后台数据库使用SQL Server数据库管理软件,通过C#高级编程语言实现了具有通信模块、登录模块、管理模块、考勤功能模块的考勤管理系统软件。结果表明该系统能够实现基本的考勤功能,具有较高的安全可靠性。     

医院门诊挂号、收费信息系统建立与管理

为了提高医疗质量,加快门诊挂号、划价、收费的速度,减少病员痛苦及排班站队时间,使医院能准确及时统计诸如病员数、收费情况等有关信息,该系统采用客户/服务器体系结构,服务器采用SUN E450,在数据库方面采用东软集团有限公司软件产品事业部开发的通用数据库管理系统OpenBASE 4.5,客户端采用Windows NT平台下,通过PowerBuilder开发,采用ODBC方式与数据库连接,可以支持200多个并发客户,通过软件系统的使用实现了计算机预约挂号、计价收费、网上传递检查检验信息,明显地减少了病人排队、走路、询问及等待结果的时间.     

基于Android平台与Web服务器的课程管理信息系统

基于Android平台搭建了一个客户端/服务器结构下的课程管理信息系统。客户端为智能手机,使用Android Studio开发,服务器利用Tomcat搭建Web容器,用开发工具My Eclipse10对服务器编程,并用My SQL数据库开发环境提供数据层应用。所用到的开发语言有Java和SQL,最终实现了手机客户端添加、修改、删除课程,课程提醒,用户注册、登录功能,以及课程信息通过Http远程上传和下载。Web端具备后台查看已注册用户的功能。本系统能够为学生选修课程和教师管理课程信息提供方便。     

浅析硬盘播出系统的构建（下）

数据库服务器 播出系统的正常运转依赖于数据库服务器。数据库服务器在整个系统中起到了系统元数据管理的重要作用。一般播出系统采用客户机／服务器体系结构,采用数据库服务器对所有数据进行统一管理,客户端应用程序只负责系统的应用逻辑部分。用户根据不同的操作权限,可以在客户端进行相应操作。     

浅谈触摸屏技术在医院门诊实现信息查询的研究

医院门诊触摸屏信息查询系统采用C/S(客户机/服务器)模式,该系统前端使用Microsoft Visual Studio 2010中的ASP.net技术开发,后台采用大型数据库Oracle管理数据信息。系统整个开发过程严格遵守软件工程的理论规则,查询功能可以完成医院简介、临床内科、外科查询、医技科室、医生出诊以及楼层规划图详细的信息等功能。     

基于VLC的校园信息发布系统

VLC不仅具有普通播放软件的功能,还具有流媒体服务器的功能。为了解决传统校园信息发布系统时效性差、更新维护复杂、成本高等缺点,这里提出了一种基于VLC的混合客户端/服务器模式（C/S,Client/Server）和浏览器/服务器模式[2]（B/S,Browser/Server）模式的信息发布系统。通过分析VLC源码,总结VLC体系结构,创建流媒体服务方式,完善VLC流媒体服务器功能,扩展了VLC流媒体服务器、VLC客户端网页插件和WEB技术,并通过测试与运行证明该系统是可靠、有效的,且能运用在其它信息发布领域。     

基于C/S与Socket模型的电池监控系统设计

为了能实时高效的掌握蓄电池工作的情况,设计出一种远程电池监控系统,实现了电池数据信息的采集与存储功能。本设计基于socket与C/S模型,采用多线程技术,使用SQL Server 2005保存数据,客户端与服务器直接通过以太网传输数据,使用线程池模型,能够充分高效的利用每个工作线程,其中服务器可以同时为多个并发客户端服务。经实际工程测试,系统数据传输过程中稳定可靠,并且相比单线程效率有很大提高。     

广西电视台全台网络化的构想(下)

四各子系统的功能介绍本系统中所选用的所有硬件设备如FC阵列、数据流磁带库、核心服务器等均为经过性能测试和长期市场验证的成熟产品,其安全可靠性可以得到充分保障。在网络设计中,关键链路均采用了冗余连接并使用了双FC交换机构建SAN,网络单点故障不会导致系统瘫痪。数据库服务器和MDC服务器均使用了集群技术,任何一个服务器发生故障后都会有另一服务器自动接管其工作。系统中使用的所有软件包括数据库,SAN文件共享及非线性编辑软件等也都是经过实践验证比较成熟稳定的产品。通过统一的管理系     

负载均衡集群技术在企业级PDM系统平台的应用

为了确保企业应用系统在大流量的客户端请求下,在提高网络速率有限的情况下,能承受客户端大量并发访问请求,尽可能大地提高系统的处理能力以及高稳定性。本文提供了以负载均衡集群技术为系统平台架构的方案。该方案以产品管理系统软件为应用软件,安装配置结合使用小型服务器热备机制、负载均衡技术以及数据库均衡技术一同实现的系统平台架构。从系统平台底层,改变传统单台系统服务器的使用压力,均衡分配对系统服务的访问负载量,排除单点故障瓶颈,提高整体系统访问速度和工作的生产效率。     

局域网内即时通讯系统的设计

即时通讯系统(IM)作为一种通讯手段,提供方便快捷的交流方式,通过网络进行在线文字交谈,文件传输、语音对话及进行视频会议等。本文主要研究的是基于TCP协议,利用Socket网络编程技术,采用C#面向对象编程理念实现的即时通讯系统。系统结合C/S模式与P2P模式的优点,采用二者混合的模式作为总体的设计模式,服务器端主要处理与数据库相关的客户请求,客户端与其他客户端进行连接通讯,无需服务器中转,减轻服务器端负担,提高信息传递的实时性和高效性。系统实现申请帐户、验证登陆、即时聊天、用户管理,好友添加、文件传输、聊天记录查询等功能,并使用VisualC#强大的界面处理能力,提供友好的服务器和客户端操作界面。     

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.     

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.     

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.     

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.     

Call for Papers

正Communications—VLSI Researches and industries of telecommunications have been growing rapidly in the last 20 years and will keep their high growing pace in the next decade.The involved researches and developments cover mobile communications,highway and last-mile broadband communication,domain specific communications,and emerging D2D M2M communications.Radio communication steps into its