id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
work_yhebvymmmrhipnq36s66tjy2u4	Shengquan Yang	Research of Virtual Network Classroom Collaborative Mechanism Based on Petri Net	2017	9	.pdf	application/pdf	3772	230	64	Keywords: Virtual Classroom, Collaborative Mechanism, Petri Net, Process Control Figure.1 The states graph of teacher and student in virtual network classroom According to the changed states of teacher and student in figure 1, their collaborative relationships are The collaborative mechanism among the virtual network classroom can be described into a Petri net, as Figure.2 Petri net model of the collaborative mechanism among the virtual network classroom of the waiting speech students, Simultaneously the right to speak resources flows from the P6 place to the to listening state, simultaneously the right to speak resources flow from the P6 place to the P5 place, which Research of Virtual Network Classroom Collaborative Mechanism Based on Petri Net Research of Virtual Network Classroom Collaborative Mechanism Based on Petri Net Research of Virtual Network Classroom Collaborative Mechanism Based on Petri Net Research of Virtual Network Classroom Collaborative Mechanism Based on Petri Net	./cache/work_yhebvymmmrhipnq36s66tjy2u4.pdf	./txt/work_yhebvymmmrhipnq36s66tjy2u4.txt