C in firm governance is often associated with inbound and outbound movements of key decision makers. This research extends that observation by treating mobility as a trigger of demographic change in management teams that, in turn, influences organizational survival. Mobility occasions transformations in demographic profiles both within a firm and among firms sharing a competitive arena. In the ...

A new two-layered optimisation-based control approach is developed for multi-product, multi-echelon supply chain networks. The first layer employs simple feedback controllers to maintain inventory levels at all network nodes within pre-specified targets. The feedback controllers are embedded as equality constraints within an optimisation framework that incorporates model predictive control prin...

In this paper, we study a multi-echelon uncapacitated lot-sizing problem in series (mULS), where the output of the intermediate echelons has its own external demand, and is also an input to the next echelon. We propose a polynomial-time dynamic programming algorithm, which gives a tight, compact extended formulation for the two echelon case (2-ULS). Next, we present a family of valid inequaliti...

Organizational Nimbleness and Operational Policies: The Case of Optimal Control of Maintenance Under Uncertainty ALI DOGRAMACI and SURESH SETHI Abstract The speed with which an organization takes action against unplanned failure and scrapping of its capital equipment is used as a measure of organizational nimbleness. Operational decisions at the plant level are studied in the setting of the opt...

We have considered a distribution inventory system with one warehouse and several retailers. Customer demand arrives at the retailers and the material flow between echelons is driven by reorder point/order quantity inventory control policies. Our objective is to calculate the long-run inventory statistics. The challenge in this system is to characterize the demand arrival process at the warehou...

Drug abuse or more appropriately substance abuse has become a household term recently, all thanks to the colossal publicity given to a fresh Bollywood release “Udta Punjab.” The directors of the movie seem to have exaggerated the subject on whole unlike our society notions, whereby we underrate the prevalence, perils, and sequelae of this menace. The need of the hour states that we as dental he...

Nasopharyngeal carcinoma (NPC) is a head and neck neoplasm that occurs in endemic numbers among people of southern Chinese descent. External beam radiation to the nasopharyngeal bed and primary draining lymph node echelons is the mainstay of treatment with concurrent cisplatin-based chemotherapy for more advanced disease. Detection of residual and/or recurrent NPC has important clinical implica...

This paper addresses a multiperiod integrated model that plans deliveries to customers based upon inventories (at warehouse and customer locations) and vehicle routes. The model determines replenishment quantities and intervals at the warehouse, and distribution lots and delivery routes at customer locations. We investigate coordination of customer and warehouse replenishment decisions and illu...

Retrobulbar hemorrhage is an uncommon, but potentially devastating complication associated with facial trauma. It can rapidly fill the orbit and cause an "orbital compartment syndrome" that subsequently cuts off perfusion to vital ocular structures, leading to permanent visual loss. Treatment must be initiated within a limited time in order to prevent these effects; however, specialty consultat...