工件有不同就绪时间的三台机器自由作业稠密时间表的性能比是7/4。在工件操作长度与机器无关、或者工件操作数不超过2的两种特殊情况下,证明了稠密时间表的性能比可以改进为5/3。
It's proved that the performance ratio of the dense schedule for three-machine open-shop problem with job release times is 7/4. This paper proves that the performance ratio could be improved to 5/3 when the processing times are independent of machines or the number of operations is no more than 2.