Seminar Series at the University of Florida

UF

I presented in the University of Florida’s Industrial and System’s Engineering Seminar Series on Halloween.  I enjoyed my  time among the Gators, especially the time I spent meeting the ISE faculty and learning about the neat research they are working on.  The comments and questions I received from my presentation on “Analytical Modeling of Logistics System Design” sparked some new thoughts and directions for my research.

Here’s my research presentation description:

Logistics is concerned with the efficient flow and storage of goods from point of origin to point of consumption, and plays an important role in our day-to-day lives and our economy.  To illustrate, consider the “journey” of the things we use in our lives.  Think about the succulent strawberries in your lunch that provide nourishment, think about the medical supplies necessary to keeping us healthy, or think about the smart phone that you constantly check.  Logistics has enabled us to enjoy all of these things.  My research focuses on greater understanding of logistic system design through the development of analytical decision-making models.  This presentation will focus on an important problem in distribution center design and in military logistics.

Reshuffling is a warehouse strategy where the storage locations of items are changed during idle time to create a new layout configuration that will improve picking and put-away performance. This study investigates how to optimize reshuffling and quantifies the effect of common assumptions in the reshuffling literature. The contributions of this study include the first mathematical programming formulation for the general reshuffling problem, a lower bound that demonstrates the intrinsic complexity of the problem, several heuristics based on the problem structure, and managerial insights on the performance of reshuffling policies in various environments. Experimental results suggest that the proposed insight-based heuristics statistically improve upon a benchmark heuristic by relaxing how items in cycles are handled and incorporating double-handling.

Seabasing is a strategy implemented by the US Navy that allows Joint Forces to be supported from the sea.  From a logistics perspective, seabasing will transform a set of vessels into floating distribution centers that eliminate the need for a stockpile of materials on shore.  Vital components of seabasing include selective offloading capabilities, ship-to-objective logistics via aerial delivery, and vessel-to-vessel cargo replenishment. Sea-based logistics operate in a challenging and uncertain environment and have unique mission characteristics; consequently, sea-based logistics require the development of specific logistics models.  We are currently building analytical models to help design and evaluate responsive sea-based logistics delivery systems with imperfect visibility.

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