在线考试系统数据库安全分析与对策

在线考试系统作为一种考试方式,在实际教学中得到了广泛的应用,但是很多在线考试系统存一定的安全问题,本文着重在线考试系统的数据库问题解决方案与实现途径。     

在线考试系统的研究与设计

介绍在线考试系统涉及到的体系结构以及Web数据库技术,并分析在线考试系统的功能需求,在此基础上设计了在线考试系统的三大功能模块,以实现方便考试管理及防止作弊的功能．     

基于J2EE在线考试系统的设计与实现

在线考试系统可以利用网络,随时随地对学生进行考试,是传统考场的延伸,课题是在分析在线考试系统现状的基础上,结合软件工程的思想,详细分析了在线考试系统的总体结构。在线考试系统是在结合先进的教学管理方法和现代网络技术基础上,采用JSP、JavaBean等技术构建,实现题库管理、试卷的手动/自动生成、考试管理、考试控制、考试结果的公布与查询等功能。     

在线考试系统的设计与实现

考察了现有考试系统存在的缺陷,分析了在线考试系统的结构,并提出了一种利用Internet进行考试的在线考试系统的设计思路和实现方法。     

基于JSP的在线考试系统的设计

在线考试系统能够为学校提供一个简化传统考试的方案,是现代考试方法改革的必然要求,也是深化教育教学改革的需要.基于JSP的在线考试系统正是结合了JSP、MySQL数据库等技术开发出的一种在线考试系统,从在线考试系统的功能需求分析入手,得出其应包含管理员模块、学生考试模块、教师维护模块、系统退出模块,并详细介绍各个模块的功能设计.     

高校在线考试系统的设计实现

在线考试系统由于具有减轻教师负担,节约成本,提高考试公平性的特点,已经开始被应用到各种考试中。高等院校由于考试科目繁多,学生数量庞大,对在线考试系统的需求更为强烈。本文针对高校考试的特点,对在线考试系统进行了分析和基础设计。     

基于Web的在线考试系统

提出了基于web的在线考试系统的解决方案，介绍了在线考试系统的功能、系统设计以及人机交互的实现，讨论了在线考试系统的实现策略、对系统文件及数据库的保护、系统的安全性等。     

高职院校网络在线考试系统的应用现状分析

针对高职院校网络在线考试系统的建设问题进行了探讨和分析,指出,随着网络技术在教学中的不断应用和普及,改变传统的考试模式,探索网络在线考试系统的应用,是一种趋势。对在线考试系统可实现的功能指标和创新之处作了具体阐述,并提出了完善系统的措施。     

基于MVC和Ajax技术的在线考试系统的设计与实现

文章首先分析了在线考试系统的开发背景和意义,探讨了在线考试系统的开发模式和实现技术;然后介绍了以J2EE体系结构为基础的MVC开发模式和Ajax技术,并以此基础上实现了在线考试系统。     

基于.NET的发卷交卷系统设计

随着计算机技术的不断普及,高校的普通期末考试,很多科目都是在机房利用计算机进行考试,一方面基于B/S模式的在线考试系统虽然在客观题方面有着比较大的优势,然而对于主观题并无优势可言,有些主观题甚至不适合采用基于B/S模式的在线考试系统来进行考试;另一方面这种基于B/S模式的在线考试系统通用性不强,一个考试系统只适合一门课程的考试;针对基于B/S模式的在线考试系统的局限性,提出了用.NET开发通用性很强的适合多种课程考试的发卷交卷系统。     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.