Design and Application of Computer-aided English Online Examination System NONG DeChang 1, a

Transcription

1 3rd Inernaional Conference on Maerials Engineering, Manufacuring Technology and Conrol (ICMEMTC 2016) Design and Applicaion of Compuer-aided English Online Examinaion Sysem NONG DeChang 1, a 1,2 Guangxi Technological College of Machinery and Elecriciy, Nanning ciy, Guangxi Prov. China a nongdechang@163.com Keywords: Compuer-aided Tesing; English; Real- ime Tesing; Online examinaion Absrac. Wih he popularizaion of compuer, compuer-aided examinaion by has becoming he ho opic of sudies. In English eaching and esing, using he compuer aided es sysem o es he English abiliy of sudens has been a rend. In his paper, compuer aided English exam sysem boh a home and abroad are sudied, some problems in he field es par are concluded. To solve hese problems ha can be improved, he auhor pu forward echnical soluions for field examinaion sysem of compuer-aided English es developmen o realize opic diversificaion and cross-plaform characerisics. Inroducion of relaed echnology The developmen of he compuer professional English online examinaion sysem mainly involves he following relaed echniques. ASP. NET echnology ASP.NET is new ype of archiecure in he developmen of Microsof.ne sysem. Par of he uniy is based on he common language of program frame, can run in WEB applicaion developmen plaform and build srong ASP.NET WEB applicaion wih ASP.NET WEB services. Code o wrie ASP.NET applicaion can be any language compaible wih common language run-ime (CLR), including c #, visual basic, J Scrip.NET, ec. ASP.NET applicaions can be used on all ne framework and provide developers a variey of run-ime environmen service. ASP.NET les developers play advanage of hese echnologies, including he common language run-ime, daa access, language inheriance, error handling, ec., developers can wrie cleaner code srucure, a he same ime, he code can be used muliple imes and sharing. ASP.NET can work ogeher seamlessly wih visualizaion HTML edior and oher programming ools, faciliae developers make he fulles use of hese ools provided by he advanages. For example, Microsof Visual Sudio.NET programming ool, i provides graphical IDE (inegraed developmen environmen) o creae he applicaion. [1]In his way, some developers have deskop developmen experience will be very easy o use, hus realize a smooh ransiion o he developmen of ASP.NET. Daabase echnology SQL server is a relaional daabase sysem Microsof launched. As a service operaion, he SQL server componen runs in a Windows service manner. SQL Server provides he core suppor for he XML (exensible markup language), and on he basis of Web sandards daabase programming funcion, provides he user connecions, query reques service and he funcion of daa securiy. SQL Server has he following feaures: (1) Good compaibiliy: because he SQL Server uses he same code base, even if he applicaion environmen difference is differen, i can sill ensure compaibiliy beween differen applicaion environmen daabases. (2) Powerful soring procedure: he sored procedure is o sore pre-compiled of on he server, which procedures can be invoked in he background or he foreground. [2]Use sored procedures can reduce nework raffic and make he funcion modules are shared by users so as o speed up he The auhors - Published by Alanis Press 1891

2 developmen efficiency. Firs execue he sored procedure will creae query ree in buffer, do no need o redo he precompiled when execued laer, which acceleraed he speed. By gran users access o he sored procedure o avoid users direc access sorage used in he process of daa able can guaranee he securiy of he daa in he able. (3) Daabase funcion: SQL Server relaional daabase engine can suppor he funcionaliy required by he daa processing environmen. The daabase engine proecs he inegriy of he daa. Disribued query can refer o differen sources of daa, and proec he inegriy of he disribued daa updaing. ADO daabase access echnology ADO.NET is subsequen echnology of Microsof AciveX (ADO), which is he sandard of service for he ASP. NET and Windows Forms applicaions access o a variey of daa (such as an RDBMS and XML documen). I is based on developer feedback, afer many modificaion and developmen of daa access library. ADO.NET provides he consisency for Microsof SQL Server daa source and XML hrough OLEDB and public daa sources. [3]Daa user applicaions can use ADO.NET o connec o he daa source, rerieve, and updae he operaion number. ADO.NET suppors a variey of developmen requiremens, such as fron-end cusomer daabase, and he middle of he Inerne browser for business objec, ec. Compuer-aided Language Learning sysem provides a good Learning environmen for he suden's oral pracice, i can effecively guide he correc pronunciaion of sudens and rain and improve sudens' oral English abiliy. Suden's speech rae is mainly from he accuracy of speech, of he fas speed, sress esing, ec. Curren raing mehod using hidden Markov model (HMM) auomaic speech recogniion echnology. Selec phonemes as recogniion uni in he phonemes associaed Vierbi decoding, sound source is used as a measure, and he more similar he higher raings are. There was a posiive correlaion beween similariy and he size of phoneme pronunciaion, inonaion, clear, ec. Assuming ha he ih phoneme of phonemes q, Ti for beginning corresponding o he period of ime. T momen of he observed characerisic vecor for O, corresponding HMM saus o S,he HMM likelihood score is based on: M i = i+ 1 1 = i lg[ P( S S 1) P( O S )] The core of ADO.NET componens include: Connecions: a ADO.NET boom, open Connecions beween he program and daabase. Commands: send some insrucions o he daabase. Such as query, add, modify, delee, and call persising program exiss in he daabase, ec. Daa Readers: read flow daa sep by sep down direcly, he Daa is read-only, and does no allow for oher operaions. Dae Se and Dae Se Commands: processing image daa. Dae Se is a memory-residen daa forms, which represens a se of daa and operae daa hrough Dae Se Commands. Compuer-aided es sysem secion seings The exam answer sysem is a very imporan par in compuer aided es sysem, on which sudens realize answer he quesions on he communicaion sysem. Wheher he design is reasonable and human or no will definiely affec he final scores. A humanizaion, simple reasonable exam answer sysem can le sudens feel free for es operaion, hus reduce he ension of he examinee exam, promoes sudens o develop heir own poenial, and ge a good resul. Only by cooperaing wih oher sysems, can exam answer sysem play is role. The supervise sysem of examinaion sysem will exhibi es quesions according o he order on he screen. [4]When he invigilaion sysem send ou a cerain command, exam answer sysem would reac accordingly o process ex, images, audio, video, ec. So exam answer sysem can be divided ino hree pars, as shown in figure 1 and figure

3 Figure 1 Funcional modules of he exam answer sysem Adapive esing and roll sysem Compuer adapive es 1) Overview In radiional es, all he examiners of all levels are o accep he same subjec es, which means for he sudens of low level will be frusraed by he difficul opic while for he sudens of high level, i couldn es he examiners real level ou wih his paper, wasing energy in vain. Theoreical analysis and pracical experience has proved ha he subjec difficuly levels corresponding wih sudens level, informaion provided is of he larges amoun and he es validiy is he bes. Compuer adapive es (CAT) akes iem response heory as he heoreical basis. I is a kind of new es mehods and means developed according o he characerisics of he compuer in he 80s. Adapabiliy es implemen differen es iem according o he differen levels of each of he subjecs, and he difficuly of he projec adap hemselves o he level of he subjecs. According o he es heory, adap he es quesions according o he levels of he projec paricipans. If he projec difficuly makes he rae around 0.5, hen he projec for he es precision of subjecs is he larges. Because using iem response heory requires considerable compuaional power for value deerminaion of subjecs abiliies, he adapive es adop fixed branch of early es. Wih he wide populariy of he compuer and he rapid increase of compuing power, modern adapabiliy es used more flexible branches o he presen projec paricipans. [5]Adop flexible branch esing can maximize he use of compuer compuing power o achieve he purpose of providing es precision. Since he projec of compuer o sudens is compaible wih he level of he sudens,, only abou 30% 50% of he es iems are needed o achieve he same es precision as he radiional es. In conclusion, compuer adapive es has many inheren advanages. 2) Overall process of compuer adapive es A he beginning of he es, he sysem know nohing of subjecs of laen rai generally, so he usual approach is o choose medium difficuly of es quesions, which assumes ha all examinee's abiliy as he medium in he course of random difficuly for medium opic as he saring poin of he es. Then, every ime afer answer he quesion, he sysem will esimae and correc he original abiliy according o he suden's abiliy, and hen pick up he quesion from he iem bank, which process can reach he specified level. 1893

4 Online auomaic scoring 1) Relaed research of auomaic scoring Use of echnical means o evaluae sudens learning has been one of he imporan conen of educaion echnology research. The Compuer Assised Assessmen (CAA) refers o he Compuer applicaion in he process of he eaching evaluaion; i makes profound changes on he form of evaluaion conen and mehod. Firsly, exam conen is no longer resriced o dimensions of knowledge, skill examinaion. Secondly, auomaic marking becomes he focus of research. Using he daabase, which is formed by he CAA can auomaically generae various kinds of saisical analysis repor, or evacuae rules, paerns and rends a a higher level, i cerainly helps o educaion evaluaion of quaniaive research. Bu he CAA researches a home and abroad are mainly concenraed in wo aspecs of objeciviy and adapive esing, relevan heory, mehods and echniques has been relaively maure, enered he sage of pracical applicaion sysem. Bu es auomaion research field is in is infancy boh a home and abroad, a presen can only solve he problem of auomaic marking of objecive quesions. Therefore, now some so-called paperless examinaion sysem is of simple opic. Alhough some auomaic sysem can also be carried ou on he par of he acual operaion assessmen, bu only limied o he par of he course conen, he lack of skill evaluaion auomaion general heory research, o realize he auomaion of skills assessmen key echnology is also no breakhrough. There is no doub ha he skills assessmen auomaion has become a new field of CAA. On he oher hand, i is a prominen problem ha compuer elemenary educaion reform is resriced by he skill examinaion quesions. As well known ha pracice is he firs aribue of basic compuer educaion, compuer informaion echnology (IT) skills raining is he main eaching goal, eaching evaluaion is focused on skills of maser and he soluion acual problem abiliy. Bu he curren compuer applicaion course exam only rely on he wrien es o complee, pen and paper o ake an examinaion of phenomenon sill exis a lo of experimens and operaion skills, his is obviously no conducive o he culivaion of innovaion spiri and pracice abiliy, is inconsisen wih he requiremens of qualiy educaion. To fundamenally solve he above problems, we mus o es auomaion heory, mehods and echniques for sysem in-deph research and bold innovaion. 2) Basic idea of he auomaic scoring Compuer based examinaion quesions include single opic selecion, choice, and gap filling. The former hree kinds of opic of compuer auomaic marking is easy o implemen, so he key o online examinaion of auomaic marking is o solve he gap filling quesions. The basic idea of gap-filling quesions is o examine answer each characer wih he corresponding sandard answers each characer by comparison, score according o he righ and wrong. Marking sofware firs ake ou fills up he opic all characers in he sandard answer, hen he sandard answer key characers and he secondary sring, and hen pu ino he key characer posiion of he sandard answer o he array, a he same ime, he locaion of all minor sring ino an array, and key characers fu poins o 50%, and he second sring in accordance wih he accouning for he proporion of he whole sring gives corresponding poins, he oher is he removal of he examinee should each par of he sring. One ou of he individual pars of he examinee answer sring, seeks he mach o he sandard answer, find he sring ha is correc, and give he corresponding scale scores, all characers afer a mach you can ge he key characer mach no secondary sring maching rae, was no found, he corresponding sring did no mach he srings and he sandard answer number, ec., wih hese daa can according o he given formula o calculae he opic every, and unified score is given. Summary In his paper, research and analysis abou he exising compuer assised English examinaion sysem and is field es subsysem has been carried ou. I was found ha here exis some problems in he exising examinaion sysem ha can be improved. Suppor for he exam in number needs o be improved. Mos sysems can' very well solve nework inerrupion problems appeared in he process of examinaion and sysem cross-plaform performance is bad, which need o be improved. 1894

5 Through research and analysis of hese problems, his paper pus forward soluions. Based on he design and implemenaion of on-sie examinaion sysem, compuer aided English es sysem was pu forward. References [1] Dale A, Harris. Online disance educaion in he Unied Saes. IEEE Communicaion. [2] David Lip Pia, Tradiional, Disance and Virual: an exploraion of conceps. Inernaional Workshop on Disance Learning and Virual Campus, [3] Amold, Marilyn R, Dejong, William. Skin self-examinaion pracice in a convenience sample of US universiy sudens Prevenive Medicine Mar Vol.40. [4] Chi-chien Pan, Kai-Hsiang Yang. Secure online examinaion archiecure based on disribued firewall IEEE Inernaional Conference, 2004,3. [5] G.F.Levy, Numeric AciveX componens, Sofware: Praciced Experience, 2001,