| Tartalmi leírás: |
Activities of fixed-, flexible-, intermittent-, distributable-, and unknown duration in general network time models are discussed in the paper on basis of preset lower and upper bounds on their time extent. After a short historical review, we discuss the theoretical background and we introduce a modified Floyd-Warshall algorithm to calculate a generalized network time model (GTM) highlighting differences of well-known techniques of PERT, CPM, MPM and PDM. Finally, we publish a small construction problem to demonstrate practical application and modelling activities of these kinds.
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