本文研究排序问题的线性规划松弛方法,对单台机器排序问题1|prec|∑wjCj介绍基于三个确定性线性规划松弛的2一近似算法,对平行机排序问题R|rij|(wjCj)介绍基于随机线性规划松弛的2-近似算法。这后一个算法对排序问题R|(wjCj|是3/2-近似算法.
In this article we study linear programming relaxation for scheduling problems, and propose a 2-approximation algorithm based on relaxation of 3 linear prograrns for the single machine scheduling problem 1 | prec| ∑wjCj and a 2-approximation algorithm based on random relaxation of a linear program for the parallel machine scheduling problem R | rij | ∑wjCj. The later is a 3/2-approximation algorithm for the problem R || ∑wjCj.