The Research And Design Of A Kind Of Safe, High-efficient Network Examination System

On the basis of the examination systematic research and design of the environment of the network, is one of the important contents of studying of computer-assisted instruction (CAI) at present. Set up in network and automation , multimedia of environment having an examination the system , have the signification for promoting the change of the traditional education way. Have network system system structure of a computer now correctly, make use of computer to realize basic course of the computer to examine and grade on the foundation that the technology and method of automation have been further investigated, author design " paperless computer network have an examination the system ". This text is on the basis of introducing all-sidely to relevant theory and technology, have carried on further investigation on this design.Develop paperless computer network have an examination the system , the ones that should consider first are what kind of network system structure is adopted. Present popular ASP + network of network data base have an examination the system, at the examination type, relatively suitable for only carrying on the theory examination and testing it instead of the situation of testing the operating type. In onbeing safe, the examination systematic security managerial ability relatively bad, might is it leak question and illegal situation of examination to appear. On the implementation method, because the remote access of some universities and colleges is limited in flow , it is unsuitable to have situation that a large number of students participate in the examination on the fixed time range. Two layers of structure are the structure of client servers (C/S ) which we usually talk about, the network speed is very fast , manageable, comparatively suited to carrying on paperless examination . But the online security question and difficult from receiving the question of the examination paper of the examination newly long-rangly still exists. Direct against the actual conditions , while developing and designing the system of having an examination of paperless computer network, on the system structure of the network, we have adopted one kind to download the way in which the examination question adds LAN of three layers here long-rangly , have solved this contradiction well.As to the thing that the theory type has an examination, examination system has been already riper technically. And the one that developed this main technological difficult point of system and lay in realizing the computer operation and examined graded automaticallyVBA, namely Visual Basic for Applications, one kind of all right automatic languages in common use that Microsoft is developed. VBA has defined a group of Microsoft office target's models. VBA regards every application program in Microsoft office as a target. Each application program is represented by one's own Application targets . Such as in word, Application target express word application program, sub target of it contain menu fence , tool fence , corresponding target that word order etc. of word, and the file target ,etc.While developing the paperless computer examination system, I have carried on further investigation on VBA, have done a large number of pointed experiments . Especially the edition compatibility of VBA is relatively bad, operation is relatively slow in speed, all these need to be considered synthetically while designing thesystem.This text has been also analysed carefully to the online security question which organized environmental examination of network, have put forward practical security control measures. To the main typical application program, provide the source code, to the counterpart who studies this problem, have certain reference value.