In the Operations Research queue-joining literature, beginning with Naor (1969), the queue joining probability is monotonic decreasing in the queue length; the longer the queue, the fewer consumers join. Recent academic and empirical evidence indicates that queue-joining probabilities may not always be decreasing in the queue length. We provide a simple explanation for these non-monotonic queue...

This article studies optimal investment in flexible manufacturing capacity as a function of product prices (margins), investment costs and multivariate demand uncertainty. We consider a two-product firm that has the option to invest in product-dedicated resources and/or in a flexible resource that can produce either product, but has to make its investment decision before demands are observed. T...

Portfolio Selection with Robust Estimation Victor DeMiguel Department of Management Science and Operations, London Business School, Regent’s Park, London NW1 4SA, UK, [email protected], http://faculty.london.edu/avmiguel/ Francisco J. Nogales Department of Statistics, Universidad Carlos III de Madrid, Avda. de la Universidad 30, 28911-Leganés (Madrid), Spain, [email protected], http:/...

The Operations Research Department at the Naval Postgraduate School educates experienced junior military officers in state-of-the-art operations research methods. As part of the educational program all officers go through a standard graduate course on network modeling. Within that course, students complete a class-long network modeling project of a real-world infrastructure system that solidifi...

In this paper we show that organic recommendations are preferred over commercial recommendations even when they point to the same freely downloadable research papers. Simply the fact that users perceive recommendations as commercial decreased their willingness to accept them. It is further shown that the exact labeling of recommendations matters. For instance, recommendations labeled as ‘advert...

Modelling and simulating the traffic of heavily used but secure environments such as seaports and airports is of increasing importance. Errors made when simulating these environments can have long standing economic, social and environmental implications. This paper discusses issues and problems that may arise when designing a simulation strategy. Data for the Port is presented, methods for ligh...

NaL, al Postgraduate School, Monterey, CA, USA of formal and informal logic to practial problems, especially problems in management science, broadly construed. This third special issue of Steven O. Kimbrough Decision Support Systems devoted to logic modeling ~ appears at a happy time for the field. Logic Uniuersity of Michigan, School of Business Administration, Ann modeling is established, rec...

Case Study Winning Customer Loyalty in an Automotive Company through Six Sigma: a Case Study Maneesh Kumar1, Jiju Antony1,∗,†, Frenie Jiju Antony1 and Christian N. Madu2 1Centre for Research in Six Sigma and Process Improvement (CRISSPI), Division of Management, Caledonian Business School, Glasgow Caledonian University, Glasgow G4 0BA, U.K. 2Department of Management and Management Science, Lubi...

Terrorism with weapons of mass destruction (WMDs) is an urgent threat to homeland security. The process of counter-WMD terrorism often involves multiple government and terrorist group players, which is under-studied in the literature. In this paper, first we consider two subgames: a proliferation game between two terrorist groups or cells (where one handling the black market for profits prolife...