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This paper presents a new workforce allocation optimization model for project scheduling problems with multi-skilled workforce constraints (PSPMSWC), under uncertainty about the projects. The model is a mixed-integer program(MIP) model that aims at maximizing the total profit. As a subproblem, scheduling and staff assignment for projects must also be optimized. In the experiment, projects are selected...
Nowadays, manufacturing enterprises consumes a significant amount of energy; consequently, it has a significant potential to reduce resource consumption. However, key performance indicators of the traditional production do not completely take into account environmental impacts like energy consumption in production planning and scheduling. Against this background, an energy-aware scheduling model for...
We are dealing with the problem of maximizing the weighted number of pseudo just-in-time jobs on single machine model. The concept of pseudo just-in-time is a relaxation of just-in-time. In our formulation, each job is associated with a time-window instead of due date, and the lengths of all such time-windows are bounded above by a certain value given in advanced. A job is called pseudo just-in-time...
In recent years, Virtual Production Systems (VPSs), which construct new manufacturing systems in response to changing market dynamics, have attracted considerable attention. Especially the control mechanism of VPSs has been of significant important. A control architecture based on multi-agent technology is built to support the control mechanism to schedule tasks and resources in VPSs, which is based...
Due to the closeness between theory and industrial practice, the scheduling problem has been investigated by many experts and practitioners. The mode of continuous casting and hot charge rolling in the steel making is one of the important research areas. Limited buffers and due dates of jobs which characterize the problem here investigated. Based on the analysis from a new angle, a hybrid algorithm,...
Job shop scheduling has been an active area of research for several decades. However, there seems to have been a significant gap between the theoretical research in academia and practical application in industry. The scheduling system, which are developed aiming at the vast library of benchmark problems, usually faces some challenges when applying in the real manufacturing environment to support the...
Vehicle scheduling problem of urban bus line is complex and involves multiple objectives. Currently, existing approaches incorporate those objectives in a linear fashion to form a single objective and then use a single objective optimization approach to solve it. However, these approaches can only produce one solution and it is not easy to assign a proper weight for each objective to get a superior...
Motivated by observations of actual clinic operations, we design a hybrid appointment system (HAS) for a single-physician clinic, in which the system serves a mix of acute and chronic-care patient by allowing both advance and same-day bookings to increase patient satisfaction. Because of the existence of no-shows of regular patients who book in advance, to maintain their revenue, clinics must carefully...
Considering capacity of transportation measured by space and delivery route constraints, a coordinative scheduling problem of single machine manufacturing and multiple customer delivery with due date windows was studied in this paper. A bi-level mathematic programming model was presented, and a PSO algorithm is proposed to solve the problem. Some computing tests were performed to compare the different...
It's common practice for patients to make an appointment in advance before seeing the doctor. This paper compares two alternative policies to reduce no-show for single server appointment system with exponentially distributed service time, the overbooking policy and open access policy. A specified number of patients call for an appointment before the scheduled day, but may cancel the booking or don't...
The applications and developments of approach on planning and scheduling for steel plants based on simulation based optimization is reviewed and summarized. Aiming at the complexity of planning and scheduling for steel plants, problems which need further research in this field and possible development direction are indicated.
This paper proposes a cyclic scheduling method for cluster tools in semiconductor manufacturing with equipment front-end module and multifunctional load locks. In this special configured cluster tools, the equipment front-end module consists of an aligner, a signal-arm robot, and two load locks integrated with coolers. Hence, the two load locks both have multifunction of filling, pumping, and cooling...
Most of the metaheuristic algorithms for the no-wait flowshop scheduling problem with makespan criterion have adopted the O(n2) size insertion neighborhoods, and higher order (polynomial size) neighborhoods are seldom tried. However, higher order neighborhoods can improve the solution quality of metaheuristic algorithms. The paper presents a high order neighborhood with O(n4) size called nonadjacent...
This paper discusses the scheduling problem for reentrant medical devices testing process. Firstly, while a formal Petri Net (PN) model is built by analyzing scheduling constraints and its optimization objectives, system stability and other system properties are additionally discussed. Secondly, a feasible scheduling solution is calculated based on the PN model and its scheduling constraints; its...
This paper studies the multi-trip vehicle scheduling problem with time window in the pickup and delivery service to airport. The collaboration and multi-trip approaches are used to improve the vehicle scheduling scheme' performance and effectiveness. Firstly, the multi-trip optimal cost model with collaborations is presented to describe the vehicle scheduling problem in such a service. Then a heuristic...
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