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Abstract
The Autonomous Vehicle Storage and Retrieval System (AVS/RS) with tier-to-tier vehicles is modeled as a semi-open queueing network (SOQN). Different storage/retrieval requests in the AVS/RS are modeled as different classes of customers in the SOQN model. Analyzing multiple configurations of an SOQN via computer simulation is time-consuming. Therefore, this article uses some analytical methods to evaluate the performances of a multi-class, multi-stage SOQN with general service time and interarrival time distributions. Two synchronization policies are also compared and the results show that an AVS/RS with virtual synchronization has a better performance than that with physical synchronization.
Additional information
Notes on contributors
Xiao Cai
Xiao Cai received her doctoral degree from the Department of Industrial Engineering at the University of Louisville in 2010. She spent 4 years working on developing queueing networking models and algorithms for analyzing automated material handling systems under the guidance of Professor Sunderesh Heragu. After her graduation, she worked in the pricing department of FedEx from 2010 to 2013 on data mining modeling and customer segmentation study. Currently, she is working in the advertisement monetization team of Microsoft.
Sunderesh S. Heragu
Sunderesh S. Heragu is Professor and Head of the School of Industrial Engineering and Management at Oklahoma State University where he holds the Donald and Cathey Humphreys Chair. Previously, he was the Mary Lee and George F. Duthie Chair in Engineering Logistics in the Industrial Engineering department and Director of the Logistics and Distribution Institute (LoDI) at the University of Louisville. He has also served as Professor of Decision Sciences and Engineering Systems at Rensselaer Polytechnic Institute, Assistant Professor in State University of New York, Plattsburgh and held visiting appointments at State University of New York, Buffalo, Technical University of Eindhoven and University of Twente, in the Netherlands, and IBM’s Thomas J. Watson Research Center in Yorktown Heights, NY. He is author of a book titled Facilities Design (currently in its third edition) and has authored or co-authored over two hundred articles many of which have appeared in journals, magazines, books and conference proceedings. He has served as Principal investigator or co-investigator on research projects totaling over $20 million funded by federal agencies such as the Department of Homeland Security, National Science Foundation, Defense Logistics Agency and private companies such as General Electric. Dr. Heragu is a Fellow of the Institute of Industrial Engineers (IIE). He has received IIE’s David F. Baker Distinguished Research award, Award for Technical Innovation in Industrial Engineering the IIE Transactions on Design and Manufacturing Award and IIE Transactions Award for Best Paper Published in “Feature Applications” for a paper co-authored with his student, and the Gold Award of Excellence for Leadership in Facilities Planning and Design.
Yang Liu
Yang Liu currently works for the Chrysler Group. He was a Research Associate in the Department of Industrial Engineering at the University of Louisville from 2010 to 2012. He received his B.S. and M.S. in Automation from Tsinghua University in China and his Ph.D. in Electrical Engineering from the University of Kentucky. His research interests include modeling and analysis of manufacturing systems, inventory systems, and healthcare systems.