Research And Design On Quality Class Video-on-Demand System Of College Of Humanities And Sciences Of Northeast Normal University

With the rapid development of computer technology,wide use of computer in the management,multi-teaching method is imperative.It is required that in 21^st century;talents educated by higher education must accommodate market economy and social development, renew themselves of knowledge and have a certain degree of creativity.Network Video Education is an effective way of great stride of China education,e-learning has become an important part of the in higher education,and teaching platform software is the technology foundation of realization. Design and development of network-based video-on-demand system of instruction so that they give full play to the network of multi-media features and advantages of the technology and more effective support for creative students personalized learning programs to increase the level of the building and promoting quality teaching resources,sharing of technical education Research in the field of important issues.Many college students are not satisfied with studying of a single course or even a specialty. They would like to see more good quality curriculum which are given by excellent teachers. Education Department of Jilin Province launched an activity of "Universities class quality" selections in each individual independent college in 2007.There was one province-level course and four college-level courses obtained in our college.Colleges make video in the two newly-built micro classrooms.I combine my college class quality of the actual situation,after the actual demand,the development of Research and Design on Quality Class Video-on-Demand System of College of Humanities and Sciences of Northeast Normal University.Web system architecture to realize the system interface development using ASP.NET and MS SQL Server,the use of video compression MPEG-4 encoding,video collection,coding,transmission and use of DirectShow decoding technology.Related to quality teaching and on-demand system designed to study the contents of this paper can be summarized as follows:(1) Studied the quality of the class system-on-demand developments for the information society and the popularization of higher education trends,the introduction of the self-www-based learning system for teaching mode.Analysis of the on-demand streaming media systems research.(2) Research network streaming media technology,MPEG compression standard,H.264 video format and related technologies such as ASP.NET.In response to a relatively narrow bandwidth of the network,users need to wait until the whole file to download after all see the contents of which,in order to ensure good teaching results,a teacher courses online video-on-demand,video information using MPEG-4 compression standard Using streaming media technology in the transmission network.(3) I designed and implemented using a network of information technology for higher education teaching and non-real-time management of a comprehensive education system.The system provides students with software-on-demand,online video-on-demand,Q & A forum for teachers and a series of necessary links in the campus.From the system as a whole in line with the simple,user-friendly,flexible,practical,safety, quality teaching to complete the whole process of on-demand,the main function of the user, including landing,video-on-demand,software downloads,site search,forums,management background.In this paper,the design quality of the class system-on-demand to meet the college students in the free time after school courses for pre-selected video review,as well as download the software at the same time teachers and students can communicate through the forum, convenient and efficient solution to the problem.The main thesis describes the development background of this issue,to be completed by the function and development.Note the key focus of system design,design ideas,technical difficulties and solutions.The system difficult to achieve with the focus on:(1)Datalist control:the system in the development process,a lot of places to use the DataList control.DataList Web server control to a data format,which can use the template format and style defined.DataList control can be used for any repeat of the structure.DataList for example,paging technology is the use of one of the key points.Compared to bring in GridView paging capability is,DataList paging technology developers need to write code manually through the ways to achieve,allowing developers to choose the page to be more free.(2) Validated code:At present,the website to prevent the use of the robot automatically registered user,to register,water,it also adopted the validate code technology,the so-called validate code,is group of 4 strings of character which produces stochasically.Here I used the picture-code technology.First,through the Random kind of production random number,the random number production is from the seed value start.If uses the identical seed repeatedly,will produce the same digital series.Has the different sequence one method is causes the seed value and the time correlation, thus regarding a Random kind of each recent example,can have the different series.This system uses Random kind of Next() the method to return to the random numberNext,when the production random number later needs to put these informations to the picture, therefore needs to assign a Bitmap kind of recent example,simultaneously assigns the example the size.Finally method increases the random number through Graphics the kind of DrawString() the information to a Bitmap kind of example.(3) The password is stored in the system,a forum for the development process so as to guarantee the safety of the user password,the password for the encryption methods used to store the same time,the system provides a password to recover the function of such a system to store passwords can not be Md5 using one-way hash algorithm to encrypt the data in the system we were to adopt the single DES key cipher.DES is the most influential single key code algorithm,which applies to large amounts of data encryption occasions.By the National Bureau of Standards enacted in 1977.It is characterized by both encryption or decryption using the same key,the password security system is the key security. If the leakage of key,this PIN system will be broken.Its advantages are:safe.Speed encryption and decryption.The disadvantage is that:1) With the network expansion,a key management difficult;2) can not solve the problem confirm the news;3) the lack of disclosure of key auto-detection capabilities.I am the subject of the Academy of quality class video-on-demand system and method to achieve a framework for better research,there has been some experience,subject to subsequent research has provided first-hand information.However,due to the author on the level and time constraints,only to build a framework designed to complete some of the functions,improving from a number of gaps,the author believes that there are a lot to do some research and many work to be done by actual application,there are some aspects to make further research and improvement:(1) Lack of information resources.Class products at the provincial level can be extended to college class products and to increase the stress on celebrities,experts,such as video lectures rich teaching resources and video-on-demand.(2) Cluster Server and corresponding load balancing strategy can be used in order to solve problems of network block and quality of service(QOS) decline generated by large request for teaching resources.(3) A number of colleges and universities now have excellent Web site class,each college or university can,according to its actual situation,share some of the lessons of software products and video information.(4) Remote access should be made further improvement and network security should be,at the same time,strengthened,to ensure the smooth operation of the system.