The general dimension is a combinatorial measure that characterizes the number of queries needed to learn a concept class. We use this notion to show that any p-evaluatable concept class with polynomial query complexity can be learned in polynomial time with the help of an oracle in the polynomial hierarchy, where the complexity of the required oracle depends on the query-types used by the lear...

Let M(R) denote the measure algebra on the additive group of the reals. R. G. Douglas recently pointed out to us the importance of the following question in the study of Wiener-Hopf integral equations: if fxÇ:M(R) is invertible, then under what conditions does jit = exp(j>) for some vGM(R)? The relevance of the above question in integral equations stems from the fact that if JJLÇÏM(R) is invert...

For Today's Logistics Manager, It's a Jungle out There! Customer-mandated programs with a wide variety of names (JIT, Quick Response, Vendor Managed Inventory, etc.) all share common requirements such as compliance labeling and shrinking order-cycle times. Internal demands to reduce inventory levels coupled with an ever-increasing number of stock keeping units (SKUs) makes the job even more dif...

In a previous International Journal of Production Economics article, a comparative model was presented for inventory costs of purchasing under economic order quantity (EOQ) with quantity discounts and a just-in-time (JIT) order purchasing system. This paper expands the comparative model to include a relevant cost component not considered in the previous article. The results of the revised model...

We consider a firm that manages its internal manufacturing operations according to a just-in-time (JIT) system but maintains an inventory of finished goods as a buffer against random demands from external customers. We formulate a model in which finished goods are replenished by a small fixed quantity each time period. In the interest of schedule stability, the size of the replenishment quantit...

Lean manufacturing has been widely adopted by many production companies. Apart from the operational difficulty associated with conversion from a traditional, functional based operation, adoption of Lean manufacturing involves significant organizational transformations. It requires formation of work teams, comprised of multi-skilled workers. The work teams are preferably self directed and need t...

Lebanese industries are growing so fast and expanding their businesses while managing their time, inventory, labor, quality and other production factors in order to increase productivity and output while reducing waste. For that, lean manufacturing aims to reduce the inventory and gain more profits while getting a better quality of the goods delivered to the customers. The aim of this Article i...

Lean production (or lean management respectively) gained popularity in several waves. The last three decades have been filled with numerous attempts to apply these concepts in companies. However, this has only been partially successful. The roots of lean production can be traced back to Toyota’s just-in-time production. This concept, which according to Womack’s, Jones’ and Roos’ research at MIT...

When purchased components for an assembly manufacturing operation are replenished Just-In-Time the investment in inventory holding of these components is eliminated, but usually with increased fixed reorder cost. It is therefore important in the pursuit of high returns on inventory investment to know for which components JIT replenishment is an optimal policy. In this paper we describe two deci...