%0 Journal Article
%T On the Dummy Activity<br>论虚元素
%A Ren Shixian
%A <br>任世贤
%J 系统工程理论与实践
%D 1999
%I 
%X In this paper, we firstly summerize the researches on the dummy activity of A on A, A on N and BANT, point out the problem in the drawing for the dummy activity of A on A and A on N. Then we point out that the dummy activity, as a fundamental theory in network planning techniques, was presented in network planning techniques.
%K activity
%K couple activity relation
%K restrained time series
%K horizontal dummy activity<br>元素
%K 元素耦合关联
%K 元素层序
%K 水平虚元素
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=962324E222C1AC1D&jid=1D057D9E7CAD6BEE9FA97306E08E48D3&aid=CAB4E8BCA341D3B0&yid=B914830F5B1D1078&vid=2A8D03AD8076A2E3&iid=CA4FD0336C81A37A&sid=CB423C9A71560A74&eid=46CB27789995047D&journal_id=1000-6788&journal_name=系统工程理论与实践&referenced_num=10&reference_num=0