Seyed M. R. Iravani

Learn More
Most performance evaluation models in operations management literature have assumed that tasks possess standardized completion criteria. However, in many operation systems, particularly in service and professional work, judgment is frequently required to determine when a task is completed. In thin paper, we show that introducing discretion in task(More)
A companies outsource more product design and manufacturing activities to other members of the supply chain, improving end-product quality has become an endeavor extending beyond the boundaries of the firms’ in-house process capabilities. In this paper, we discuss two contractual agreements by which product recall costs can be shared between a manufacturer(More)
P architecture and organizational communication play significant roles in complex product development efforts. By using networks to characterize both product structure and communication patterns, we examine the impact of mismatches between these on new product development (NPD) performance. Specifically, we study the vehicle development process of a major(More)
Although white-collar work is of vast importance to the economy, the operations management (OM) literature has focused largely on traditional blue-collar work. In an effort to stimulate more OM research into the design, control, and management of white-collar work systems, this paper provides a systematic review of disparate streams of research relevant to(More)
We consider a two-stage tandem queue attended by a moving server, with homogeneous Poisson arrivals and general service times. Two different holding costs for stages 1 and 2 and different switching costs from one stage to the other are considered. We show that the optimal policy in the second stage is greedy; and if the holding cost rate in the second stage(More)
This paper models and analyzes serial production lines with specialists at each station and a single, cross-trained ßoating worker who can work at any station. We formulate Markov decision process models of two and three station production lines in which (1) workers do not collaborate on the same job, (2) two workers can work at the same task/workstation on(More)
We study the impact of yield uncertainty (supply side) and self-interested consumers (demand side) on the inefficiency in the influenza vaccine supply chain. Previous economic studies, focusing on demand side, find that the equilibrium demand is always less than the socially optimal demand since self-interested individuals do not internalize the social(More)
We consider processing and shipment scheduling of a batch of size M jobs on a flexible (multifunctional) machine. All jobs in the batch require the same sequence of N operations on the machine. Costs are incurred in the forms of holding costs of jobs waiting for the next operation, setup costs whenever the machine is set up for a new operation, and shipment(More)