tailieunhanh - Lecture Notes in Computer Science- P20

Lecture Notes in Computer Science- P20:This year, we received about 170 submissions to ICWL 2008. There were a total of 52 full papers, representing an acceptance rate of about 30%, plus one invited paper accepted for inclusion in this LNCS proceedings. The authors of these accepted papers | Course Material Research Based on Perti Net 85 O means Void MS I means Void KP tstop means the Stop KP set and Xstop means the Stop MS. a a MS is the Ancestor MS of other two MS for example X12 b a MS reflects KP set with two or more KP for exaple X6 c a material can be taught until two or more KP are mastered. Different from b it describes a material reflecting a new KP which has two or more In-arc in KP net for exampe X4 d the end of the courseware means that all KP without Out-arc in the KP net migrate to the Stop MS For example KP D and E. Experiment Based on the material accessibility of MPN the dynamic behavour of MS can be analyzed. In the graph of a MPN n means that this MS have n number material. Example 2 About example 1 assumed X12 has three material X5 has three material etc. See figure 4. Fig. 4. MPN of the Example 2 Based on the figure 4 some conclusions can be given A transition sequence Xstart X12 A X5 B X3 C BC X7 E X4 D tstop Xstop can be found. Therefore it has a path from Xstart to Xstop without the MS X6. Of course if X6 is learned the impressions of KP B and KP C can be enforced. If the KP B does not longer present in the syllabus for teaching innovation the transition E BC and D would not be accessed and the MS X4 X6 and X7 can not be learned in the courseware. It is assumed that a KP sequence A C D tstop exists. But we can not find any path conforming with it. Thus the assumption is inconsistent with teaching requirement. The tstop is the Stop KP. If one KP does not be learned it would not exist a transition from tstop to Xstop. Thus if some KP are not reflected in the selected MS this courseware will not be able to cover with the syllabus. 86 K. Xiao S. Chen and X. Chen If a new KP F is increased there would not have a transition sequence from Xstart to Xstop. Thus the MS reflecting KP F must be increased in the courseware. 5 Conclusion Nowdays many researcher concern the auto-generation courseware in e-learning and ignore what MS is .