Title: Integrated studies on job shop processing and shipment planning
Authors: Zhang, Zheng (張政)
Abstract: In supply chain management, several material and product flows exist with different features and different directions. Assembly parts can be manufactured at different factories, and shipped to the assembly factory for processing. Finished products are then shipped to the retailers or customers by logistics companies. In the current research, a job is defined as a sequence of manufacturing and logistics activities. A manufacturing activity performs some specific engineering tasks in the production process. Logistics activities generally refer to the physical movement of materials and products and warehousing in the shipping process. In practice, decision makers often manage a portfolio of jobs or product lines in the company. The arrangement of manufacturing activities is considered in “job shop processing”. The objective is to determine the machine assignment to complete job activities. In the shipping process, the management of logistics activities is studied in “shipment planning”. Nowadays, a manufacturing job may be processed in several locations. The research on job shop processing and shipment planning should be integrated. Extensive works have been conducted on job shop scheduling and shipment planning respectively. However, the existing studies mostly ignore the linkages between job shop processing and shipment planning. The current thesis develops several models to study the integration of job shop processing and shipment planning. Managerial issues that affect job processing cost are addressed.
The first study considers a shipment planning problem that includes both forward and reverse logistics jobs and the identification of reverse logistics centers. The inclusion of reverse logistics jobs introduces manufacturing process activities and transport activities in different directions. In the current study, the cost-saving factors by combining forward and reverse logistics activities are considered in the management of the job portfolio. The site selection of reverse logistics centers focuses on cost saving in the grouping of job processing activities in the same location. The reduction in total job processing cost can be achieved from the compatibility of and integration among forward and reverse logistics jobs.
The second study investigates a job shop processing problem in which the processing activity locations are to be determined. We consider a job shop processing problem in which the machines can be set up in several factories in different locations. Thus, the shipping of materials and parts in job processing is a consideration in cost saving. The problem aims to determine the machine set up locations and the machine assignment of job activities to minimize the total job processing cost. A nonlinear integer-programming model is proposed to solve this job shop problem; managerial issues are also discussed.
The current thesis contributes to the integration study of job shop processing and shipment planning. The research provides useful tools for practitioners in the supply chain management who manage several product lines that include both job processing and shipment activities.
Notes: CityU Call Number: HD38.5 .Z435 2012; ix, 168 leaves 30 cm.; Thesis (Ph.D.)--City University of Hong Kong, 2012.; Includes bibliographical references (leaves 152-168)
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