The advanced information technologies have made it possible for individuals to carry out cooperative learning efficiently and effectively from anywhere and at any time. To capitalize on the individual need and address the issues associated with the late entry into the e-learning area, it has great significance to study the service mechanism of CSCL on e-learning service and e-learning service computing modeling. This paper proposes an e-learning service model supporting for the life-cycle process management. The proposed model is developed by considering the learner's behaviours during e-learning services, the scheduling policies, and the monitoring mechanism of learning activities. Business process modeling for e-learning services can be taken according to the study ordering of the knowledge points by using workflow modeling technology and process enactment mechanism. The overall life-cycle process management of knowledge is addressed by combining knowledge product modeling, knowledge resource modeling, and credit polices for member selection in research team by considering trust value of learners, advisers and providers in e-learning services. The proposed method can be used for supporting the sustainable development of e-learning services from planning and design, organizing e-learning process, maintenance of the e-learning process, to process improvement, as well as to support learners and advisers to effectively complete innovative team study and complex computation study. Lastly, an extended topic map tool has been developed by adding a knowledge requirement level and an information extraction tool to validate the proposed methodology. These tools can used to guide learners to concentrate on the required knowledge topics and drive knowledge providers to redevelop outdated knowledge hierarchy.
Based on free Hopkinson bar, preformance test of ignition tube was conducted from input end, output end and radial about shock overload. The results show that radial is more irritable than output end, and output end is more irritable than input end at the same shock overload and pulse width.The radial is worse. When the ignition tube is stressed,the deformation of overall dimension occurs.When the deformation reaches certain degree,the resistance value begins to change. X-ray CT chromatography analysis is performed on ignition tube afer radial shock overload,the result further shows that supporting effect of electrode plug and its close cooperation with shell is helpful to improve anti-overload of ignition tube. Study results shows that structure design of ignition tube is special,the ability of anti-overload is good.It provided Theoretial Support for design and reinforcement of ignition tube in anti-high-overload.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.