Browsing Journal Articles by Author "Roy, Debjit"
Now showing items 1-20 of 55
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AGV or Lift-AGV? Performance trade-offs and design insights for container terminals with robotized transport vehicle technology
Kumawat, Govind Lal; Roy, Debjit (IISE Transactions, 2020-08-13)New container terminals are embracing robotized transport vehicles such as lift-automated guided vehicles (LAGVs) and automated guided vehicles (AGVs) to enhance the terminal throughput capacity. Although LAGVs have a high ... -
An analytical modeling framework for determining the optimal table mix in restaurants
Raman, Arun; Roy, Debjit (IFAC-PapersOnLine, 2015)We present a queuing theory based optimization model for determining the optimal table mix in a restaurant. The optimal table mix problem is formulated for an allotment policy in which the largest available group is allotted ... -
Analyzing rental vehicle threshold policies that consider expected waiting times for two customer classes
Jennifer A., Pazour; Roy, Debjit (Elsevier, 2015)Vehicle rental providers, which operate in an uncertain environment, offer differentiated services to priority and non-priority customers. In this research, we study one such service differentiation strategy, a vehicle ... -
Blocking effects in warehouse systems with autonomous vehicles
Roy, Debjit; Krishnamurthy, Ananth; Heragu, Sunderesh S.; Malmborg, Charles (IEEE Transactions on Automation Science & Engineering, 2014)Autonomous vehicle-based storage and retrieval system (AVS/RS) offers considerable flexibility with respect to throughput capacity in the transfer of unit loads in high density storage areas. AVS/RS relies on autonomous ... -
Carbon footprint analysis of pallet remanufacturing
Roy, Debjit; Thorn, Brian K.; Carrano, Andres L.; Tornese, Fabiana; Pazour, Jennifer A (Journal of Cleaner Production, 2016-07-10)This research is the first attempt to characterize the carbon equivalent emissions associated with pallet remanufacturing operations for two repositioning scenarios (cross-docking and take-back), and under multiple levels ... -
A constrained nash bargaining approach to the stock rationing problem in multi-echelon supply chains
Roy, Debjit (International Journal of Advanced Manufacturing Technology, 2014)In order to survive in the global volatile market place, supply chain analysts are brainstorming to arrive at robust inventory control policies that prevents inventory worth of millions of dollars to get tied up in the ... -
A cooperative quay crane-based stochastic model to estimate vessel handling time
Dhingra, Vibhuti; Roy, Debjit; de Koster, Rene B. M. (Springer, 2017)Having a good estimate of a vessel’s handling time is essential for planning and scheduling container terminal resources, such as berth positions, quay cranes (QCs) and transport vehicles. However, estimating the expected ... -
Cost-effective pallet management strategies
Roy, Debjit; Carrano, Andres L.; Pazour, Jennifer A.; Gupta, Akash (Elsevier Ltd, 2016)The existing industry strategies for managing pallets, (single-use expendable pallets, buy/sell programs, and leased pallet pooling programs), are analyzed and compared using push and pull inventory control policies. A ... -
Design, modeling, and analysis of vertical robotic storage and retrieval systems
Azadeh, K.; Roy, Debjit; De, Koster R. (Transportation Science, 2018)Autonomous vehicle-based storage and retrieval systems are commonly used in many fulfillment centers (e.g., e-commerce warehouses), because they allow a high- and flexible-throughput capacity. In these systems, roaming ... -
Determinants of safe and productive truck driving: empirical evidence from long-haul cargo transport
Roy, Debjit; Vries, Jelle de; Koster, Rene de; Rijsdijk, Serge (Elsevier Ltd, 2017)Using GPS data of 370 long-haul trips in India, survey data of 49 truck drivers, and ERP data, this study examines the role of driver personality characteristics in predicting risky and productive driving. The results show ... -
Dynamic vehicle allocation policies for shared autonomous electric fleets
Roy, Debjit; Dong, Yuxuan; Koster, René De; Yu, Yugang (INFORMS, 2022-03-31)In the future, vehicle sharing platforms for passenger transport will be unmanned, autonomous, and electric. These platforms must decide which vehicle should pick up which type of customer based on the vehicle’s battery ... -
Estimating performance in a robotic mobile fulfillment system
Roy, Debjit; Lamballais, T.; De Koster, M. B. M. (Elsevier B.V., 2017)This paper models Robotic Mobile Fulfillment Systems and analyzes their performance. A Robotic Mobile Fulfillment System is an automated, parts-to-picker storage system where robots bring pods with products to a workstation. ... -
An extensive evaluation of CONWIP-card controlled and scheduled start time based production system designs
Roy, Debjit; Ravikumaran, Vasudha (Elsevier, 2019-01)Order release policies such as a card-controlled CONWIP policy aim to improve system responsiveness and minimize system-wide inventory levels. It is not clear if order release policies (without card control) can be equally ... -
Fleet sizing for transporters with seasonal demands
Roy, Debjit (International Journal of Automation and Logistics, 2013, 2013)We develop a quick and approximate way to address the fleet sizing problem for transporters with non-stationary demands and uncertain trip times. Non-stationary demands are modelled using Markov-modulated Poisson process ... -
How Data-Driven Decisions Help Restaurants Stay Competitive
Roy, Debjit; Spiliotopoulou, Eirini; Vries, Jelle de (Harvard Business School Publishing Division, 2023-10-03) -
Improving service system performance using estimates of waiting time probabilities
Roy, Debjit; Gupta, Akash; Pazour, Jennifer A. (International. Journal. of Automation and Logistics, 2014)Queue length distributions provide insight into the impact of service system design changes that go beyond simple performance measure averages; however, such distributions are difficult to estimate when service times are ... -
Integrated fleet mix and routing decision for hazmat transportation: a developing country perspective
Roy, Debjit; Kumar, Anand; Verter, Vedat; Sharma, Dheeraj (Elsevier, 2018-01-01)In developing countries, truck purchase cost is the dominant criteria for fleet acquisition-related decisions. However, we contend that other cost factors such as loss due to the number of en route truck stoppages based ... -
Integrated inventory replenishment and online demand allocation decisions for an omnichannel retailer with ship-from-store strategy
Bansal, Vishal; Bisi, Arnab; Roy, Debjit; Venkateshan, Prahalad (Elsevier, 2024-02-28)Retailing has changed dramatically from single-channel brick-and-mortar stores to multi-channel and omnichannel retailers over the last few decades. Omnichannel retailers employ different strategies to integrate online ... -
Integrated storage-order picking systems: technology, performance models, and design insights
Roy, Debjit; Tappia, Elena; Melacini, Marco; Koster, ReneDe (Elsevier, 2018-11)In many warehouses shuttle-based technologies have replaced the traditional AS/R system based storage technologies. The impact these systems have on downstream order picking performance is largely unknown. To study the ... -
Inventory allocation in robotic mobile fulfillment systems
Roy, Debjit; Tessensohn, Tim Lamballais; Koster, René B.M. De (Taylor and Francis, 2020)A Robotic Mobile Fulfillment System is a recently developed automated, parts-to-picker material handling system. Robots can move storage shelves, also known as inventory pods, between the storage area and the workstations ...