基于AJAX在线考试系统的研究

基于AJAX的Web设计与实现在线考试系统,使用AJAX技术实现与服务器的异步通信,最终在网页中实现丰富友好的用户界面,该考试系统能带给用户无刷新的视觉体验.系统具备良好的用户界面,用户可以通过设置不同的组卷策略来实现随机抽题组卷,能够添加多媒体试题是该考试系统的一大特色.     

基于SaaS模式的分布式在线考试系统设计

纸质考试命题组卷以人工为主,试卷知识点、考题类型等组卷因素需要人为把控,存在组卷效率低下的弊端。设计基于SaaS模式的分布式在线考试系统,系统核心业务中的题库管理模块构建自身属性的考试题库,学生登入系统后在考试模块中选取考试科目,题库管理模块根据学生选取的科目,在题库里采用基于改进遗传算法的智能组卷算法组卷后返回至考生页面,考试后学生和老师可在信息查询统计模块中查询成绩。实验结果表明,所设计系统组卷耗时为9.35 ms,组卷成功率高达100%,组卷效率与组卷质量较高;和同类型考试系统相比,具有响应速度快、承压能力好的优势,得到多数考试机构的认可。     

电力行业安全规范考试监训系统设计与实现

本文通过对电力行业安全规范训练考试的特点进行分析,总结出一套适合电力行业安规训练考试的方法,并通过信息化手段实现电力安全规范试题的在线训练和在线统一考试.安全规范考试监训系统必须符合电力行业易用的考试界面、灵活的考试配卷、多样的考试类型、及时的试题更新、方便的考生选择、实用的错题遴选、便捷的移动训练等特点,在丰富电力行业员工安规学习考试手段的同时,加深员工对电力行业安规的理解,在施工维护时能按照安规要求进行规范操作.     

企业职工标准化技术比武理论无纸化考试硬件平台的规划与设计

本文介绍了基于网络技术和数据库技术开发的B/S模式无纸化在线考试硬件平台的规划与设计。该平台适应各类技术比武理论考试形式的发展变化,使企业技术比武理论考试逐步实现无纸化,为选手提供了公平、公正的竞赛环境,避免了人为因素的影响。该考试平台能实现客观题和填空题的在线考试,具有试题录入、修改和查询,计算自动组卷以及进行在线考试等重要功能,可以满足任何授权的考生随时随地考试并迅速获得成绩,大大降低了组织难度,节约了考试成本。     

基于VB的试题库系统的设计与实现

随着计算机技术及人工智能的发展,组卷系统的研究逐渐被越来越多的专家学者所关注,同时也改变了学校的教育观念、教学模式及考试模式。本文在分析国内外大量文献的基础上,基于随机算法,针对考试系统的自动组卷问题,介绍了基于VisualBasic语言的试题库平台的设计与实现方案,详细讨论了该系统的设计特点和主要功能。本系统用于实现试题输入、查询及试卷的生成、编辑、打印功能,在最大程度上满足出题者的各项要求,其中组卷程序实现了从试题库中随机抽取,使生成的试卷合理化、规范化、科学化。投入运行结果表明,抽取随机、无法预知、快速组卷,克服了试卷中的人为因素,增强了试卷的保密性。     

关于计算机应用基础无纸化考试的研究

现在无纸化考试是高校信息化的主要考察方式,如何解决好无纸化考试中的关键环节是一个重要的课题。基于《计算机应用基础》无纸化考试系统为教师和考生提供了自动组卷、自动评卷、成绩查询等功能,并提出了进行自动组卷、自动评卷的方法。     

智能组卷的HSK自适应分级考试系统

在自适应分级的对外汉语考试系统(HSK)上提出了一种具有知识点最大覆盖性质的组卷算法。该算法把对知识点的覆盖、题型均衡化、自适应难度作为主要控制目标。当开始测试时,测试者可以使用系统的缺省等级,也可以自选等级,系统将依据指定的等级采用具有自适应功能的最大覆盖算法从题库中合理抽取试题组成试卷用于汉语水平测试。对比实验表明,具有最大覆盖性质的自适应试题抽取算法,对考生汉语能力的评价更为客观。     

改进随机函数局限性样本取数优化算法

为了解决各类考试系统中随机抽取试题时存在试题重复和试题命中率不均匀的现象,提出一种改进随机取数局限性的样本取数优化算法。通过引入样本概念,从试题库中采集题号产生题号样本,利用随机函数产生预选样本,由预选样本在题号样本中映射出所对应的题号,形成试卷草样,经过排序形成试卷正样,完成试卷生成工作。采用样本取数优化算法具有较好的区间收敛性,试题库中试题的命中率高,接近平均值。该算法应用于试题库抽取试题具有速度快、抽取时数据量轻,组卷速度快。     

基于B/S模式的网上考试系统

随着现代远程教育的兴起,网上考试系统也开始受到人们的关注。首先介绍了网上考试系统的需求分析、总体设计和详细设计过程,并在此基础建立了后台数据库,实现了基于B/S模式的网上考试系统。系统使用方便、操作简单,已具有试卷录入、修改和查询,手工组卷与自动组卷以及进行在线考试等重要功能,授权考生随时随地考试并立即获得成绩,系统自动进行成绩分析与试卷评估。     

利用文本相似度改进遗传算法的组卷实现与研究

在分析遗传算法适应度对遗传算法收敛性影响的基础上,针对试题试卷部分的信息参数和评价指标,对遗传算法在组卷中的应用进行了具体的论述,分析了遗传算法在组卷系统中各个部分的实现方法,提出了组卷模块的体系结构。针对遗传算法本身的原理特性进行讨论,研究其理论基础及其所具有的过早收敛的"早熟"现象,并利用排挤算法的早熟现象将组卷系统中的遗传算法进行改进。随后建立向量模型进行快速的试题相似性检测,使考试内容和考试质量得以提升。最终将研究结果进行实验对比与分析,并对研究结果进行了工程实现。     

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.     

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.     

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.     

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.     

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.