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1、外文资料:Regardalongwiththenetworktechnologydailypopularizationandtheinformationconstruction,nowtheschoolgenerallyallcompoundedthetestsafemonitoringequipment,andhasbuiltthemanagementinformationsysteminthisfoundation,toinformationconstructionpositiveimpetusfunction.Buthasthesoftwareconstructioninthepract
2、icalworktofallbehindthephenomenonwhichconstructstothehardware,forexample,theeducationadministrationlevelalsopausestoexaminee'sinspectioninthetraditionaltestpattern,notonlytheefficiencyislow,moreoveralsohasmanymalpractices,createstheinformationresourcethewaste.Testnon-paper,network,notonlycaneffe
3、ctivelyreducethecorrelationpersonnel'sworkload,thebetterusecomputerandthenetworksuperiority,enhancestheworkingefficiency,alsocanfairlycausethetest,tobefair.Basedonthiskindofdemand,wedevelopedsetofperformancestablyforthetestdesign,safehavebeenreliablethenetworkwhich,theeaseofoperationwasallowedto
4、satisfymassivelysimultaneouslyusestotakeatestthesystem.Causesthetestthesecurity,fairness,fairgreatlytoenhance.Afterthissystemactualmovementuses,effectgood,notonlygreatlyadvancedthetestinformationconstructionadvancement,moreovercausestheschooltoexaminee'sinspectionmorescientific,air,fair,tobehigh
5、lyeffectiveandthenetwork.Thenetworktestsystemshouldbeabletosatisfythemassiveexamineesinanyplace,anytimeallcanparticipateinthetest,andautomaticjudgmentresult.Throughtothetestservicedemandmultianalysis,themainfunctionwhichthissystemshouldprovideasfollows:1) Theexamineemayon-linecarryonthetest,afterthe
6、testhadfinishedbycomputerautomaticjudgmentscore,andtherecordingresult,theexamineealsomayexaminethestandardanswer.Ifthetesttime,thesystemautomaticpromptcompletesanassignmentandstopsdoinganswers.2) Theteachermayon-lineestablishtherevisionquestionbank,revisestheexamineeindividualmaterial,andmonitorsthe
7、examinationplacesituationandsoon.3) themanagermayon-lineestablishreferencematerialandsoontheexaminee,teacher,theverificationquestionbank,arrangestheexamineetotakeatest,revisestheexamineeandtheexaminationplacecondition,inquirestheexamineetotakeatesttheresult,monitorstheexaminationplacesituationaswell
8、astheestablishmenttestprojectwithteststhetestquestionnumberandsoon.Moreoverfortheguaranteetestfair,isfair,theexaminationpapertestquestionstochasticallyextractsbythecomputerfromthequestionbank.Forstrictlywillceasethetesttocheatthebehavior,thesystemlaterisbestalsoshouldprovidethefunctionwhichthefinger
9、printconfirmationwillregister.Itsmainflowis:Aftertheuserbasisisauthorizedregisters,thesystembasisuserjurisdictiondifference,establishesthecorrespondingoperation.Afterthetrainattendantregistersmaycarryonthetest,operationandsoonexaminationresultandstandardanswer;Aftertheteacherregistersmaycarryonrevis
10、esoperationandsoonexaminee'sindividualmaterial,revisionquestionbank,revisionuserpasswordaswellasmonitoringtestsituation;Afterthemanagerregistersbesideshasteacher'sallfunctions,butalsomaycarryontheverificationquestionbank(onlyhasverifiedquestionbankonlythentobeallowedtocarryontest),establishm
11、entoperationandsoontesttime,inquiry,printingtestresult.Alsomayestablishfollowingseveralitems:Testworkstation:Carriesonthetesttotheexamineethecustomerendprocedure.Mainlyprovidedhascarriedonaccordingtothesystemdispositionstochasticallysetsthetopicofacomposition,theconfirmationregisters,testfunctionand
12、soontimeprompt,automaticjudgmentresult,examinationtestresultaswellasstandardanswer.TestworkstationdividesintothecustomerendprocedureandtheWebwayintherealizationway,formerallowstheexaminee(supporttouchesscreentestpattern)throughthecustomerendprocedurethewaytocarryonthetest,latterallowstheexamineetoca
13、rryonthetestthroughthetestspecial-purposenetwork.Thetestestablishestheworkstation:Carriesontheestablishmenttotetestservicethecustomerendprocedure.Mainlyprovidedtherevisionquestionbank,theverificationquestionbank,revisedtheexamineematerial,establishestheexaminee/examinationplacecondition,theinquiry/p
14、rintingtestresult,thequestionbankinducts/derivesfunctionandsoonfunctionaswellasmonitoringtestsituation.Testapplicationserver:Networkon-linetestsystemapplicationserver.Mainlyhasrealizedthedatacushionandthetestservicelogicsealandduplicateusesthefunction,istakesatesttheworkstation,thetestestablishesthe
15、workstationandthedatabaseserverconnection.Hasprovidedtherichconnectionusingtheserver,mayincreaseorthereducedservicerulethroughthemoduleway,consideredlaterwilltakeatesttheservicepromotion,alsoshouldreservethenewtesttypeconnectionusingtheserverlevel,willcauselaterthesystemtoexpandconveniently.Moreover
16、,forguaranteetesteffectiveness,usingserversupporthotbackupdatabaseserverpattern,namelyifpresentlyisusingthedatabaseserverbreaksdown,theninthesystemdispositionreservedatabaseserverautomaticcutoverforthecurrentdatabaseserver,alltheseisdoesnotknowintheuserwithintheinterventionsituationcarrieson.Through
17、applicationserverleveleffectiveness,trulycausedthetestservicetoachievetheuseeasily,thefunctionformidable,theperformancestable,themodulardegreewasstrong,hassatisfiedthenewtimetoaninformationconstructionhigherrequest.Furthermore,consideredthesystemthestabilitywithcarriesouttheefficiency,intheanalysisn
18、etworkconfigurationfoundation,thesystemlatermightselectdistributionalthreeC/SandB/Swillmixwiththeoverheadconstructionmethod,namely:Theexamineeifmiscarriesonthetestinthissection,maychoosetheC/Sstructuretotouchthescreentestandtheexaminationsitetestpattern;Iftheexamineeiscarriesonthetestintheoutsideare
19、as,maychoosetheB/Sstructuretheexaminationsitetestpattern.Thenetworkon-linetestsystemneedstocarryonthedatathroughthenetworkthetransmission,thereforeappliestheserver,theWebserverandthedatabaseserversecuritymustfromthesystemdesigntimecarriesontheplan.Wemightusebelowthesecuritymeasure:1) Installsthereli
20、ablefirewall,carriesontheeffectivecontainmenttotheexteriormaliciousattack.2) Theserver(includingappliesserver,databaseserverandtheWebserver)theharddiskdistricttransformationistheNTFSform,opensuresportivejurisdictionaccordingtothedifferentdemandfortheuser.3) MaywritetheessentialcodetheDLLmodule,noton
21、lystrengtheneedthesecurity,simultaneouslyalsocausedthesystemthemodulardegreetostrengthen,enhancedthesystemperformance.4) Maycarryontwotimesofencryptionsinthedatabasetotheessentialdata.5) 2,000databackupswithrestoresthefunctionusingSQLtheSERVER,guaranteesthedatabaseinformationtheintegrityandthesecuri
22、ty.Thecurrentsoftwarequitepopularsystemstructuralmodelmainlyhas:C/SstructuralmodelandB/Sstructuralmodel.Thesetwokindsofstructuresmaydivideintotwowiththemultilayeredoverheadconsaturation,themaindifferenceliesinwhetherhasusedthemidleware(forexampleCOM+orCORBA)comestheoverheadconstructiontoapplytheserv
23、erlevel.ThisstructuralmodelunifieddistributionalmultilayeredC/SandtheB/Smeritdesigns,dividesintothecustomerlevel,businesslogiclevelandthedatalevelintheusualsituation.Customerlevel:Belowmainlyusesfortosatisfytheoverallsystemeachkindofvisitdemandandprocessesworks:Thereceiveuser'sinput,carriesonthe
24、analysisinspectiontouser'sinputandmakescorrespondingprocessing;Sendsoutthedatatotheservertorequestthat,demonstratedbymovementresultwhichtransmitsusingtheserver.Thecustomerlevelusuallyiscomposedbythecustomeradvancement,thecustomeradvancementmainlyincludestheadvancementinthismodelwhichtheIEbrowser
25、dynamicfoundationtheadvancementaswellasthecustomerendtestworkstationfoundsandsoon.Businesslogiclevel:Willberesponsibletoreceivetherequestwhichwilltransmitfromthecustomerendorthetourandtorequestwillbequeaththefirstfloortocarryonprocessing,simultaneouslywillrequesttheprocessingresulttransmissionforthe
26、customerendorthebrowser.BusinesslogicleveladvancementmainlyiscomposedbymiddlewareMTS/COM+aswellassomerelatedprocessingadvancements.MicrosoftCorporationhaspromotedWindowsDNAundertheWindowsplatform(DistributedinterNetApplicationArchitecture,distributionnetworkapplicationstructure)strategy.TakesWindows
27、COM+intheDNAstrategythemiddleware.IntheWindows2,000aboveoperatingsystems,COM+hasbecomeasystempart.COM+wastheintermediatelevelhascharacteristicprovidedtheloadbalance,theobjectpond(ObjectPooling),businesscharacteristicandsoonaseriesofforcesupport,andtheprocedurewhichworkedinCOM+receivestheoperatingsys
28、temtheprotection,thusthebiggestguaranteesystemsecurity,stableandwashighlyeffective.Inthismodel,mainlythroughtheADOrealizationdatadynamicration,ADOistheMicrosoftcurrentmainstreamdataaccessingmodule,compareswiththeformerdataaccessingtechnology,ithasprovidedtheextremelysimpleobjectmodel,andhassealedthe
29、complexfirstfloorvisittechnology.Datalevel:Mainlyprovidesthedigitaldataserviceforbusinesslogiclevel,likethestoreddatumoperatingresult,returnstothedataretrievalresultandsoon.ThisstructuralmodelhasovercometwoC/Smalpractice,fullyhasuseddistributionalmultilayeredC/SandthemultilayeredB/Smerit,extremelygo
30、odhasusedtheexistingnetworkresources,andistotheexistingnetworkresourceseffectiveintegration,theuseaswellastheexpansion.ThenwhatisXML?XML(eXtendedMarkupLanguage)isonekindofmarklanguage,likesHTMLwhichweisfamiliarwithtobesame,buttheXMLlabelisaccordingtoownneedstocomebythepeopletohavecustom-made,inother
31、words,anywordandthecharacterallmaydoforthelabeluses,solongascantheaccurateexpressiondataattribute.TheaccurateexpressiondatameaningisthebiggestadvantagewhichXMLbrings.Moreover,theXMLusetextmodesavesitsform,isadvantageousforbetweentheprocedure,theoperatingsystemlinksup,theexchange,theadaptionatpresent
32、theInternetdevelopment.XMLappearedtheshortseveralyearstoobtainthewidespreadapplication,atpresentnewlypromotessoftwarenearlycouldsupportXML.ForexampleMicrosoftNetseriessoftware,Officeseriessoftwareandsoon.Doesnotleaveforseveralyears,XMLcanreplaceHTMLtobecomeonInternetthestandardmarklanguage?Thissyste
33、mifintroducestheXMLlanguageexpressiondatatheadvantage,iscausesinthesystemthecustomerenddatademonstrationandthesystemprocessingdataseparation,reducesthedevelopmentsystemcomplex,reducesthesystemprocesstime,reducesthenetworktransmissionquantity,thusenhancesthesystemtocarryouttheefficiency.Theunifiedmod
34、elinglanguage(UnifiedModelingLanguage,UML)istheobject-orientedsoftwarestandardizedmodelinglanguage.Becauseitssimple,isunified,alsocanexpressinthesoftwaredesignthetendencyandthestaticinformation,atpresentalreadybecamethevisiblemodelinglanguageinfactindustrystandard.Fromenterpriseinformationsystemtoba
35、seonWebdistributionalapplication,evenisstrictreal-timeinsertsthetypesystemallsuitablytocomeinhandyUMLtocomethemodeling.Thisisonekindofrichexpressionstrengthlanguage,maydescribeeachkindofviewwhichthedevelopmentneeds,thentakethisasfoundationassemblysystem.ThissystemifintroducesUMLthemainsuperiorityenh
36、ancesthesoftwaredevelopmentefficiency,reducesthedevelopmenttime,savesthedevelopmentcost.TaketheUMLlanguagemodelingshouldbebyRationalCorporation'sRosetoolasbest.ButRosequiteexpensive,andRosequiteishuge,usesisnottooconvenient.BorlandCorporationproducestheModelMakermodelingtoolnotonlysupports,moreo
37、veralsohasitsoriginalplaceintheobjectmodeling.ThereforethemodelingtoolselectsModelMaker.翻译:随着网络技术的日益普及和信息化建设的出视,现在学校普遍都配制了考试安全监控设备,并在此基础上搭建了管理信息系统,对信息化建设起到了积极的推动作用。但在实际工作中存在着软件建设落后于硬件建设的现象,例如,教育管理层对考生的考核还停留在传统的考试模式,不仅效率低下,而且还存在许多弊端,造成信息资源的浪费。考试的无纸化、网络化,不仅能有效减少相关人员的工作量,较好的利用计算机与网络的优势,提高工作效率,也能使考试更加公平
38、、公正。基于这种需求,我们为考试设计开发了一套性能稳定、安全可靠、操作方便的可以满足大量同时使用的网络考试系统。使得考试的安全性、公平性、公正性大大提高。本系统实际运行后使用后,效果良好,不仅大大推进了考试的信息化建设进程,而且使得学校对考生的考核更加科学化、公平化、公正化、高效化和网络化。网络考试系统应该能满足大量考生在任何地方、任何时间都能参加考试,并自动判断成绩。通过对考试业务需求的详细分析,本系统应提供的主要功能如下:1)考生可以在网上进行考试,考试结束后由计算机自动判断分数,并记录成绩,考生还可以查看标准答案。如果考试时间到,系统自动提示交卷并停止作答。2)教员可以在网上建立、修改题
39、库,修改考生个人资料,监控考场情况等。3)管理员可以在网上建立考生、教员等档案资料,审核题库,安排考生考试,修改考生和考场状态,查询考生考试成绩,监控考场情况以及设置考试项目与考试题数等。另外为保证考试的公平、公正,试卷的试题由计算机随机从题库抽取。为严格杜绝考试的作弊行为,系统以后最好还应该提供指纹验证登录的功能。其主要流程是:用户根据授权登录后,系统根据用户权限的不同,设置相应的操作操作。乘务员登录后可以进行考试,查看成绩及标准答案等操作;教员登录后可以进行修改考生的个人资料、修改题库、修改用户密码以及监控考试情况等操作;管理员登录后除具有教员的一切功能外,还可以进行审核题库(只有审核过的
40、题库才可以进行考试)、设置考试时间、查询、打印考试成绩等操作。也可以设置以下几项:考试工作站:对考生进行考试的客户端程序。主要提供了根据系统配置进行随机出题、验证登录、考试时间提示、自动判断成绩、查看考试成绩以及标准答案等功能。其中考试工作站在实现方式上又分为客户端程序与Web方式,前者允许考生通过客户端程序(支持触摸屏考试模式)的方式进行考试,后者则允许考生通过考试专用网进行考试。考试设置工作站:对考试业务进行设置的客户端程序。主要提供了修改题库、审核题库、修改考生资料、设置考生/考场状态、查询/打印考试成绩、题库的导入/导出功能以及监控考试情况等功能。考试应用服务器:网络在线考试系统的应用
41、服务器。主要实现了数据缓冲及考试业务逻辑的封装与复用功能,是考试工作站、考试设置工作站与数据库服务器的接口。应用服务器提供了丰富的接口,可以通过模块方式增加或者减少业务规则,考虑到以后考试业务的升级,应用服务器层还应预留了新考试类型的接口,使得以后的系统扩展较为方便。另外,为保证考试的高效性,应用服务器支持双机热备份的数据库服务器模式,即如果当前正在使用的数据库服务器发生故障,则系统配置中的后备数据库服务器自动切换为当前数据库服务器,这一切都是在用户所不知晓与干预的情况下进行的。通过应用服务器层的高效,真正使考试业务做到了使用简便、功能强大、性能稳定,模块化程度强,满足了新时期对信息化建设的较
42、高要求。再者,考虑到系统的稳定性与执行效率,在分析网络配置的基础上,系统以后可采用分布式的三层C/S与B/S混用的架构方式,即:考生如果是在本段进行考试,可以选择C/S结构的触摸屏考试和考点考试模式;如果考生是在外地进行考试,可以选择B/S结构的考点考试模式网络在线考试系统需要通过网络来进行数据的传输,因此可应用服务器、Web服务器与数据库服务器的安全性必须从系统设计时就进行规划。我们可采用了以下安全措施:1)加装可靠的防火墙,对外部的恶意攻击进行有效的遏制。2)将服务器(包括应用服务器、数据库服务器与Web服务器)的硬盘分区转化为NTFS&式,根据不同的需求为用户开设各自的权限。3)将关键代码可写成DLL组件,不但增强了安全性,同时也使系统的模块化程度加强,提高了系统性能。4)在数据库中对关键数据可进行二次加密。5)应用SQLSERVER200的数据备份与恢复功能,保证数据库信息的完整与安全。当前软件界比较流行的系统结构模型主要有:C/S结构模型与B/S结构模型。这两种结构又可分为二层和多层架构,主要的区别在于是否使用了中间件(例如COM+CORBA来架构应用服务器层。该结构模型结合了分布式多层C/S与B/
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