论在线测试系统在开放式远程教育中的应用

文章讨论了在开放式远程教育应用环境中实施在线测试系统的意义,对其所要实现的目标以及功能做了详尽的描述,并对系统各个功能模块提出了具体的设计建议,最后还列举了可能用到的计算机技术.     

基于Docker实现在线评测系统的安全性

现阶段大部分的在线评测系统都采用了C语言编写沙盒的方案,沙盒系统虽然技术较为完备,但是其功能繁琐,实现复杂,在小型评测系统中花费代价太大,并且可移植性较低,不好掌控。本系统另辟蹊径,利用Docker的高隔离特性,规避了使用Docker面临的Root、资源耗尽等风险,并对Docker容器占用的资源做了合理限制,最终实现应用系统和评测系统分离。本系统采用Java开发,Docker容器只需要使用编写好的dockerfile文件就可以一键搭建。相比传统沙盒,本系统具有极高的可移植性,极大提高了技术人员的效率,并且可以更方便的控制在线评测的资源占用以提高CPU和内存的利用效率。     

程序设计在线评测辅助教学系统的设计与实现

在分析现有的在线评测系统的基础上,提出在线评测辅助教学系统的设计方案,实现了程序设计练习和评判过程的自动化、标准化,并以实时的方式反馈给学生评判结果.该系统通过小范围试用,结果表明系统运行稳定、评判结果正确.     

源代码在线评测系统设计与实现

介绍了源代码在线评测系统的意义。探讨了源代码在线评测系统的模型和设计过程。最后阐述了实现时用到的关键技术。     

远程教育在线考试阅卷系统的设计及其安全性

目的为提高组织远程教育考试的效率,同时保证考试的公平性和公正性,开发基于Web的自动化在线考试系统。方法采用UML作为系统建摸语言,运用ASP技术在Web方式下,实现了计算机的数据处理、随机组题、自动阅卷评分、统计查询等功能。结果网络化考试阅卷安全系统非常适合在网络环境条件下实施在线考试。结论在线考试阅卷安全系统解决了学院现代远程教育考试工作中出现的一些实际问题,以ASP技术结合SQLServer数据库,用RSA算法对试题库进行加密操作,实现地域上分散的考生在校园内实时进行在线作业或考试,方便和简化了远程教育的教学和考试工作。     

基于在线评测系统的C语言实践教学探讨

C语言程序设计是计算机专业的基础课程,实践教学是其必要的组成部分。在介绍ACM在线评测系统的基础上,详细探讨了在线评测系统在C语言实践教学中的应用。实践证明,该系统能够实现程序代码评测的自动化,促进学生进行自我训练、提高编程技能,并在很大程度上提高了教师的教学效率和教学质量。     

基于Web的考试系统设计及其技术实现

讨论了基于Web的考试系统的主要功能及其设计方案,分析了在线考试系统的相关技术,指出了该系统能较好地解决远程教育中的考试问题,真正实现无纸化的在线考试,具有较强的应用价值.     

数控机床远程在线加工监控技术

为了实现远程在线加工和控制,对基于网络的智能化远程在线控制技术进行研究与开发.在构建完整的硬件系统基础上,采用VB 6.0语言开发软件,并利用TCP/IP网络协议选择C/S和B/S模式层次结构,实现远程在线加工和现场状态远程监测.通过在线加工监控试验表明设计开发的系统结构合理,功能全面,运行使用安全可靠.     

基于Internet的多媒体在线辅导答疑系统

论文叙述了在计算机远程教育系统中“多媒体在线辅导答疑系统”的设计与实现,对系统的实际应用实例进行了简要的阐述,并对其发展方向做了远景规划.     

远程教育系统中答疑系统的设计

基于WWW方式的网络远程教学是远程教育中的主要发展模式.由于远程教育不同于传统教育,学生学习过程中很多问题不能在授课中解决,答疑环节在远程教育中就显得尤为重要.现在的答疑系统集中在实时答疑系统、网上论坛系统、智能答疑系统的设计上.各种系统各有千秋,若将它们结合起来就会相得益彰,基于WWW方式的在线答疑系统的功能及设计思想进行了讨论.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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