Abstract
In this paper we consider the single-machine parallel-batching scheduling problem with family jobs under on-line setting in the sense that we construct our schedule irrevocably as time proceeds and do not know of the existence of any job until its arrival. Our objective is to minimize the maximum completion time of the jobs (makespan). We deal with two variants of the problem: the unbounded model in which the machine can handle infinite number of jobs simultaneously and the bounded model. For the unbounded case, we provide an on-line algorithm with a worst-case ratio of 2 and prove that there exists no on-line algorithm with a worst-case ratio less than 2. For the bounded case, we also present an on-line algorithm with a worst-case ratio of 2.
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