Papers by Allen Greenwood
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Integer programming (IP) models are powerful tools for operations planning, but may encounter pro... more Integer programming (IP) models are powerful tools for operations planning, but may encounter problems when applied in a stochastic environment. We propose a methodology to evaluate the robustness of an IP model using discrete-event simulation. In our case, the IP model determines truck and pallet schedules for a cross-docking facility. A portion of the output from the IP model is used as input to a simulation model that represents the facility. The decisions regarding pallet transfers and truck departures are left to the simulation model to ensure flexibility. Random events are induced through the simulation in order to see how robust the IP-based schedules are against the uncertainties in: (i) the transfer time of pallets through the cross-dock, (ii) the unloading time of pallets from trucks, and (iii) the earliness or delay of the trucks arriving at the platform. The difference between the deterministic and the stochastic scenarios are evaluated regarding the number of pallets pu...
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FlexSim is chosen by the authors because of its comprehensive functionality and its ease of use. ... more FlexSim is chosen by the authors because of its comprehensive functionality and its ease of use. It is 3D simulation software that facilitates modeling, analysis, and visualization of systems in manufacturing, material handling, healthcare, warehousing, mining, transportation, logistics, etc. It effectively provides the means to: (1) address the physical and logical aspects inherent in simulation modeling and (2) experiment with, and analyze, simulation models. FlexSim closely aligns with the purpose of this text—namely to understand simulation technology and to use it to solve problems.
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Winter Simulation Conference, Dec 3, 2017
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winter simulation conference, Dec 6, 2015
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2020 Winter Simulation Conference (WSC), 2020
This paper proposes a specification for effectively defining and managing simulation projects. Th... more This paper proposes a specification for effectively defining and managing simulation projects. The specification provides a structured and ordered series of tasks that need to be completed in order for a simulation endeavor to be successful; i.e., it sets forth a set of requirements to guide a simulation project through the Project Management Institute’s five phases: initiation, planning, execution, monitoring and controlling, and closing. The specification is applicable to any type of simulation, in any domain, for any purpose, and for any scale. Similarly, it can be used with any simulation software.
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Integer programming (IP) models are powerful tools for operations planning, but may encounter pro... more Integer programming (IP) models are powerful tools for operations planning, but may encounter problems when applied in a stochastic environment. We propose a methodology to evaluate the robustness of an IP model using discrete-event simulation. In our case, the IP model determines truck and pallet schedules for a cross-docking facility. A portion of the output from the IP model is used as input to a simulation model that represents the facility. The decisions regarding pallet transfers and truck departures are left to the simulation model to ensure flexibility. Random events are induced through the simulation in order to see how robust the IP-based schedules are against the uncertainties in: (i) the transfer time of pallets through the cross-dock, (ii) the unloading time of pallets from trucks, and (iii) the earliness or delay of the trucks arriving at the platform. The difference between the deterministic and the stochastic scenarios are evaluated regarding the number of pallets pu...
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A previously developed IP-based model for scheduling truck arrivals, truck departures, and pallet... more A previously developed IP-based model for scheduling truck arrivals, truck departures, and pallet handling in a cross-docking platform is assessed using discrete-event simulation. Experimentation with a simulation model of basic cross-docking operations subjects the schedules to a more realistic environment (e.g., stochastic truck arrival times, pallets transfer times, truck content) than can be formulated in the IP model. Analysis of the simulation experiments, in terms of the schedules' performance and robustness under pragmatic conditions, provides insights to help refine the IP model.
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The supply of material to a manufacturing facility obviously has a major impact on enterprise per... more The supply of material to a manufacturing facility obviously has a major impact on enterprise performance, whether measured in terms of cost, timeliness, quality, etc. Most material that is input to a manufacturing process is transported to the manufacturing facility via multiple modes of transportation, i.e., it involves intermodal transportation. Since the material must be acquired from outside of the manufacturing site, sourcing decisions have significant impact on overall enterprise performance. Critical elements of those sourcing decisions include specifying from where to acquire the material, in what quantity, etc. It may also involve deciding the modes that should be used to transport the material from the source to the manufacturer. Even if specifying the mode is not part of the decision process, it is a significant driver in terms of cost, reliability, timeliness, etc. These issues pertain to domestic supply, but more importantly to international supply. The sourcing decisi...
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EcoProduction, 2014
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Engineering Management Journal, 2002
Abstract A significant body of research has been aimed at identifying factors present within orga... more Abstract A significant body of research has been aimed at identifying factors present within organizations that have enabled them to successfully implement and maintain quality improvement initiatives. None of these studies, however, focus on the differences in importance of these success factors in the initiation phase versus the maintenance phase of a quality improvement effort We, therefore, present a framework for understanding said differences between success factors in the initiation phase and the maintenance phase. This framework was developed by studying highly successful organizations and the chronological development of their improvement processes.
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Discrete-event simulation is a key technology for analyzing and improving organizational performa... more Discrete-event simulation is a key technology for analyzing and improving organizational performance. Over time, various software packages have evolved that greatly facilitate the development and analysis of discrete-event simulation models. However, each of these applications ...
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This paper presents an overview of the collaboration between two courses in the Industrial Engine... more This paper presents an overview of the collaboration between two courses in the Industrial Engineering curriculum at Mississippi State University. The courses are Design of Industrial Systems, the required capstone design course, and Engineering Administration, also a senior -level required course. The collaboration process, delive rables, and experiences gained are discussed. Background Design of Industrial Systems is the capstone design course in the Industrial Engineering curriculum. It is comprised of project teams, consisting of 4 -5 students per team. Each team performs a comprehensive venture analysis of a manufactured product, including market analysis, site selection, facilities layout, process analysis, methods analysis, material handling and financial analysis. The design teams choose their own products; however, they must contain significant fabrication and assembly content. The Design of Industrial Systems course instructor acts as both the client and mentor to the proj...
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– In today’s integrated global economy, engineering collaborations span the globe. Thus, a key pa... more – In today’s integrated global economy, engineering collaborations span the globe. Thus, a key part to engineering education is to prepare students to be effective engineers in the international arena. Opportunities need to be provided for students to travel, study, and work abroad for the purpose of deepening their understanding of other cultures and other ways of doing business. This paper presents a survey of study abroad programs sampled from universities in the ASEE SE region that provide global engineering education opportunities for engineering students. The documentation and characterization of existing programs provides a foundation for forums to discuss topics of mutual interest, better understanding the problems/risks and rewards associated with the programs, comparing alternative study/work abroad models, and developing collaboration among programs. The paper also outlines the study abroad programs at Mississippi State University and the strategic plan for increasing par...
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International Journal of Production Economics, 2010
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Environmental Progress & Sustainable Energy, 2011
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The Journal of the Operational Research Society, 1983
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Papers by Allen Greenwood