基于B/S结构的网上考试系统的设计与实现

论述了基于B／S结构的计算机文化基础网上考试系统的设计和实现，研究高校计算机文化基础课实施网上考试系统技术的实现问题，提出了解决方案。详细阐述了系统功能模块划分和随机试卷的生成等关键技术的实现方法。该系统采用ASP．NET和ADO．NET访问数据库的技术，适合于任何Web方式下的考试。     

ADO.NET在Web应用中的性能优化模型分析

ADO.NET是.NET架构下的数据库访问技术,ADO.NET以XML作为传递和接收数据的格式,与ADO相比,它提供了更大的兼容性和灵活性.这里就其Web数据库访问提出一个性能优化模型,并对这些性能优化技术进行比较、讨论和测试.通过对测试结果的分析可知,要开发出一种高效检索和存取数据的ASP.NET应用程序,应该优化ADD.NET数据访问代码,应用这样的模式进行Web应用程序开发,能大大提高对数据库访问的效率和性能.     

基于ASP的Web数据库应用设计与实现

新一代的开发动态交互网页技术(ASP)给Web开发者提供了一个灵活、易用的开发环境。本文介绍了用于创建动态Web页面的ASP技术的特点、对象以及实现方式,分析了利用ASP的ADO组件实现Web与数据库互连和处理数据库数据的具体方法。ADO与ASP结合,作用在服务器端,通过OLEDB提供者存取、操纵各种关系型及非关系型数据库,通过执行SQL命令,让用户在浏览器画面中输入、更新和删除站点服务器的数据库信息,并给出了实现数据库查询的实例。最后介绍了“同学录应用系统”的实现方法。     

ADO．NET数据访问技术在电子档案管理系统中的应用

数据访问技术是Web数据库系统中最频繁的操作,是任何实际应用程序的核心部分。文中通过ADO．NET数据访问技术在电子档案管理系统中的应用实例,对使用ADO．NET数据访问技术来提高数据库访问的效率和性能进行了探讨。     

基于ASP.NET AJAX的OA系统设计

ASP.NET AJAX技术能提高Web应用程序的交互能力和开发效率.对通用办公自动化系统进行研究,描述ASP.NET AJAX框架的特点,并采用该技术设计实现基于B/S架构的通用办公自动化系统.系统实现了个人事务管理、公文管理、系统管理等功能.实际运行表明,采用该技术设计的系统响应速度快,执行效率高,并能有效改善用户的交互体验.     

用.NET技术实现在线考试系统探究

简单介绍了ASP.NET和ADO.NET的优点。并且利用其超越性采用基于ASP的B/S结构模式,利用大型数据库SQL Server 2000、数据库连接技术ADO.NET、前端开发技术ASP.NET研究了在线考试系统实现的主要模块及解决遇到的难题。部分模块给出了实现代码。     

基于ADO.NET的训练评估系统数据库设计

通过对ADO.NET对象模型的研究说明了ADO.NET的技术特点,并阐述了其在工业软件中的优势所在。研究ADO.NET的访问机制,并给出ADO.NET访问数据库的源码和实例。以饱和潜水模拟训练评估系统为背景,研究了以ADO.NET技术为核心的训练评估数据库的设计,给出了数据表的设计以及存储实例。通过对存储实例的分析,给出评估算法数据分析实例,为后续的具体实现打下基础。根据文中介绍的技术以及数据分析方式,饱和潜水模拟系统训练评估软件的设计成为可能,并且为其他工程控制软件的数据分析提供了技术依据和参考。     

基于.NET技术的在线考试系统研究与设计

基于提高考试效率和降低成本的目的,采用面向对象的设计方法（OOA）,以ASP.NET为开发技术,开发语言使用C#,后台数据库采用SQLsever2005,数据库与程序间地连接等利用.NET的数据库访问技术ADO.NET来实现,得出了以.NET技术和B/S结构构建的在线考试系统具有运行稳定、成本低、安全可靠的功能.     

基于．NET的分布式VOD系统设计与实现

本设计一个基于Web引擎调度的分布式VOD系统的体系结构，应用NET和C 程序分别实现前台用户访问接入和后台监控调度。该系统实现分布式VOD系统中各视频服务器之间的负载平衡，并通过ASP．NET制作的Web应用系统实现视频点播和后台调度功能。     

基于ADO.NET技术访问SQL Server数据库的编程实现

SQL Server是当前较为常用的数据库管理系统之一,具有速度快、功能强、易使用等特点,它主要解决数据的存储与管理问题。为了更好地实现对SQL Server数据库的访问,提出了新的数据库访问技术即ADO.NET。在此介绍了ADO.NET的核心组件和体系结构,阐述了利用ADO.NET访问数据库的2种不同方式,结合实例展示了利用ADO.NET访问SQL Server2005的基本过程,并给出了关键代码,实现了对数据的有效管理。     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

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.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks