| With the development of the Internet and Intranet technology, on-line exam is replacing the traditional exam which depends on paper and pens in many aspects. So it is very meaningful to study the exam based on computer network.Many existing Radio & TV University on-line exam systems have some disadvantages. For example, they cannot create adaptive examination papers that are fit for every student respectively, they cannot evaluate the student's learning status roundly and the speed of data transmission is very slow when the flow of information in network is very high, etc.The radio and TV university classes examination is important teaching link ,is also to choose employment and the basis diagnosing , appraising , guiding the teaching importance , to have significance suitable at the same time. Nothing paper spends examination being able to economize resource , improves examination efficiency, have decreased by each aspect going over examination papers in society spending examination therefore teacher's intensity of labor , there being no paper at the same time also being extended and applying. With development of network technology and application, nothing paper spends examination developing further becoming upper examination of net , can organize examination synchrony or asynchronous in different region and receive and dispatch examination paper all together as well. On the net, systematic examination merit behavior is:1. Keep secret nature is strong: Examination system adopt item pool to provide the examination questions source coming way on the net , have a test in front there being no any examination paper in complete set, examinee examination paper comes into being time examination from server scene random , every examinee examination paper identical , avoids completely each other read for reference lead to indulge in corrupt practices phenomenon or unfair achievement etc.; Item pool may assign specially-assigned person to manage , strengthen privacy protection to be responsible.2. Objectivity is stronger: Computer examination system adopt a random to take curly problem group way out , examination questions extracting face is relatively broader , generate and much cover examination paper at the same time, the face the examination paper entirety is covered is big , may reflect examinee's actual level basically , guard against objective examination accuracy doing a crash job of review or phenomenon such as guessing a problem , indulging in corrupt practices getting high marks , ensuring that thereby.3. Prompt accurate fairness: System but the automation is grade , prompt to standardizing examination questions Er Yan , computer examination accurate , avoid many artificial factors, problem , guarantee examination fairness are impartial if human error and human feelings classify.4. Easy to organize large-scale strange land real time examination: Take network technology as the modern times computer applications propping up, self own popularizes as a result of having bigger scale and being well-balanced , that the large-scale strange land real time examination making use of a computer network to initiate and put into operation already becomes one kind of important way in modern examination , computer examination system is among them the key one is encircled by most.In order to solve these problems, a novel architecture of an adaptive on-line exam system is proposed in this paper. Firstly, the mobile agent technology is used in this system architecture to mitigate the burden of server and the flow of information in network. The tasks in different phrases of an exam procedure are assigned to several agents. These agents can collaborate with each other during the exam period, which arranges the testing procedure in an orderly way. Secondly, we propose a new kind of student model called SM and two novel algorithms based on SM to create adaptive examination papers and provide objective assessments for students. We have implemented these algorithms and have got good effects.Examination system many forms still not adopt CAT being put into use at present in the homeland, but, the whole nation four, six steps of English examination will have be able to accomplish this one change on the future the before long, but Microsoft MCSE examination has already adopt this one kind form. CAT will become main all important examination form before long, aspect comes out strong one by one in society.Be going to realize certainly fit in with examination of computer completely but, be in the process of examination than, come to ascertain out examination tactics , it is more suitable to have degree of difficulty fitting in with each other in time according to the examinee to some one degree of difficulty the examination questions reporting. Main behavior is around:1. Large amount of the contradiction secretly scheming against and responding to in timeSince that this one kind method is reason why owing to large amount of the basis counting and secretly scheming against in large amount, when considering timeliness system is able to meet the high-effect field carry out large amount of calculative problem. How ability calculates out student's ability level and the ability level adapting examination process to examinee after every once answers the question, not affecting to interactive timeliness of system , this is a problem demanding prompt solution and as well.2. The accuracy the parameter is estimated is difficult to ensure thatCAT is the method estimating that owing to the parameter, is basis coming to estimate the ability level being an examinee's turn, estimating that at the same time as time primary in behavior in previous project by the examinee. Like this, estimate that deviation appears once some are once parametric, possibility is only capable to do leading to the ultimate parameter estimate that very big deviation and even no suitable for use appears.3. Systematic reliability has no way to ascertain that temporarilyWhen first, holding large-scale examination as if it be radio and TV university classes, since being that will be very grave owing to network examination, once problem , consequence appears on the network. Even if the network can ensure that problem does not appear, so-called broad in scope examination needs to ensure that interactive timeliness of system, the request to the network capacity and rate of flow are also very harsh.Secondly, in terms of theory, CAT still being difficult to ensure that, needs unceasingly, to confirm and improve and perfect in practice in already relatively mature, but actual application.In short , CAT now study fairly being in small-scale application possibly is a part realize a stage , large-scale all throw into progressing being put into use waiting for every aspect to study in a deep going way... |
PDF Full Text Request