This paper studies the parallel machine scheduling problem subject to machine and job deterioration in a batched delivery system. By the machine deterioration effect, we mean that each machine deteriorates over time, at a different rate. Moreover, job processing times are increasing functions of their starting times and follow a simple linear deterioration. The objective functions are minimizin...

In this paper we consider the single-machine setup times scheduling with general effects of deterioration and learning. By the general effects of deterioration and learning, we mean that the actual job processing time is a general function of the processing times of the jobs already processed and its scheduled position. The setup times are proportional to the length of the already processed job...

We study single machine scheduling problems with linear time-dependent deterioration effects and maintenance activities. Maintenance periods (MPs) are included into the schedule, so that the machine, that gets worse during the processing, can be restored to a better state. We deal with a job-independent version of the deterioration effects, i.e., all jobs share a common deterioration rate. Howe...

BACKGROUND A mismatch between individual physical capacities and physical work demands enhance the risk for musculoskeletal disorders, poor work ability and sickness absence, termed physical deterioration. However, effective intervention strategies for preventing physical deterioration in job groups with high physical demands remains to be established. This paper describes the background, desig...

In this study, we consider a permutation flow shop scheduling problem on a three-machine with deteriorating jobs (a deteriorating job means that the job’s processing time is an increasing function of its starting time) so as to minimize the makespan. We model job deterioration as a function that is proportional to a linear function of time. For some special cases, we prove that the problem can ...

Abstract: In this article a single machine time-dependent scheduling problem with total completion time criterion is considered. There are n given jobs, j1, . . . , jn, and the processing time pi of the i-th job is given by pi = 1 + bisi, where si is the starting time of the i-th job, i = 1, . . . n. If all jobs have different and non-zero deterioration rates and bi > bj ⇒ bi ≥ bmin+1 bmin bj+ ...

In this article a single machine time-dependent scheduling problem with total completion time criterion is considered. There are n given jobs j1, . . . , jn and the processing time pi of the i-th job is given by pi = 1 + bisi, where si is the starting time of the i-th job, i = 1, . . . n. If all jobs have different and non-zero deterioration rates and bi > bj ⇒ bi ≥ bmin+1 bmin bj + 1 bmin , wh...

This paper examines the hypothesis that greater job status makes a person healthier. It begins by successfully replicating the well-known cross-section association between health and job seniority. Then, however, it turns to longitudinal patterns. Worryingly for the hypothesis, the data -on a large sample of randomly selected British workers through time -suggest that people who start with good...

The paper deals with a problem of scheduling deteriorating jobs on a single machine to minimize the total completion time. Deterioration of a job means that its processing time is a function of its execution start time. We present some optimal properties for three problems, which correspond to three different decreasing linear functions, whose increasing counterparts have been studied in the li...