An overview of some fuzzy set-based approaches to scheduling is proposed, emphasizing two distinct uses of fuzzy sets: representing preference profiles and modelling uncertainty distributions. The first setting leads to a valued, noncompensatory generalization of constraint-directed scheduling. The other setting yields a possibility-theoretic counterpart of PERT, where probability distributions...

This paper deals with the problem of ,nding a minimum cost schedule for a set of dependent activities when a convex cost function is attached to the starting time of each activity. A ,rst optimality necessary and su/cient condition bearing on the head and tail blocks of a schedule is ,rst established. A second such condition that uses the spanning active equality trees of a schedule leads to de...

From a set of a partially ordered tasks, one goal of the project scheduling problem is to compute earliest starting dates, latest starting dates and floats of the different tasks, and to identify critical tasks. When durations of tasks are not precisely known, the problem is much trickier. Recently we provided polynomial algorithms to compute upper bound of activity floats in the interval-value...

Este estudo exploratório visa entender quem se beneficia com programas de parcelamento e perdão dívidas tributárias. Para tanto, tem-se como objetivo pesquisa identificar diferenças econômico-financeiras entre empresas que aderiram não ao Programa Especial Regularização Tributária (PERT). Os resultados demonstram as firmas PERT possuem maiores volumes ativos são mais endividadas. Com base na te...

Abstract Traditionally, stochastic project planning problems are modeled using the Program Evaluation and Review Technique (PERT). PERT is an attractive technique that commonly used in practice as it requires specification of only a few characteristics activities’ duration. Moreover, its computational burden extremely low. Over years, four main disadvantages have been voiced much research has d...