نتایج جستجو برای: Precedence constraints

تعداد نتایج: 189129  

Journal: :Discrete Applied Mathematics 1981

This paper considers the single machine scheduling problem with precedence constraints and deteriorating jobs. A mathematical model based on binary integer programming (BIP) is developed. By these precedence constraints, jobs can not start before completion of its all predecessors. The represented model is in two steps, in step one the earliest starting time of each job is computed, then the re...

Dehua Xu, Hongxing Li Jinquan Li,

In this paper, a due date assignment scheduling problem with precedence constraints and controllable processing times in uncertain environment is investigated, in which the basic processing time of each job is assumed to be the symmetric trapezoidal fuzzy number, and the linear resource consumption function is used.The objective is to minimize the crisp possibilistic mean (or expected) value of...

Journal: :Discrete Applied Mathematics 2002

2006
Toby Walsh

We present a comprehensive study of the use of value precedence constraints to break value symmetry. We first give a simple encoding of value precedence into ternary constraints that is both efficient and effective at breaking symmetry. We then extend value precedence to deal with a number of generalizations like wreath value and partial interchangeability. We also show that value precedence is...

Journal: :Journal of Computer and System Sciences 2012

Journal: :SIAM Journal on Computing 2004

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