We consider a cooperative game defined by an economic lot sizing problem with concave ordering costs over a finite time horizon, in which each player faces demand for a single product in each period and coalitions can pool orders. We show how to compute a dynamic cost allocation in the strong sequential core of this game, i.e. an allocation over time that exactly distributes costs and is stable...

There exist many inventory control studies that consider either continuous review & continuous ordering, or periodic review & periodic ordering. Mixtures of the two are hardly ever studied. However, the model with periodic review and continuous ordering is highly relevant in practice, as information on the actual inventory level is not always up to date while making ordering decisions. This pap...

this paper submitting the computation of optimize point of ordering in inventory control systems and particularly for continuous review of ordering system (r,q) by fuzzy logic method which similarly can be used for other ordering systems. since in the ordering models we cannot forecast the parameters like cost exactly, we have ambiguity. in this case using precise parameters may cause wrong dec...

period, the number of tests ordered has increased dramatically. As a result, the cost of clinical laboratory testing has increased considerably [1]. This has prompted the introduction of research and initiatives aimed at controlling clinical laboratory utilization without affecting the continued improvement of the quality of patient care. The solutions that have been attempted with limited succ...

BACKGROUND The concept of evidence-based medicine (EBM) was introduced in 1992. Incorporation of EBM into physicians' practices, however, has been slow. Testordering tendencies are still based on variables that are not necessarily evidence-based. METHODS The literature was reviewed to identify the non-EBM variables that affect physicians' practices of test ordering. Studies of interest were l...

We consider the problem of determining the optimal ordering and reordering policy for an inventory where the entire stockwill simultaneously become obsolete at some (typically random) time, T . Manymanufacturing, publishing, distribution, and high tech businesses face the challenge of maintaining inventories that do not age in the conventional sense; instead, they suddenly become obsolete and l...

in this paper, a multi-product continues review inventory control problem within batch arrival queuing approach (mqr/m/1) is modeled to find the optimal quantities of maximum inventory. the objective function is to minimize summation of ordering, holding and shortage costs under warehouse space, service level, and expected lost-sales shortage cost constraints from retailer and warehouse viewpoi...

revenue management is the process of accepting or ordering which increases gained revenue by using different techniques of pricing and selling capacity. this technique has improved greatly in service sector specially passenger section. in this article, the process of selling ticket in tehran-mashhad route for ghazal passenger train is modeled by two methods: static multi class and heuristic ems...

In this paper, we establish a new preservation property of quasi-K-concavity under certain optimization operations. One important application of the result is to analyze joint inventory-pricing models for single-product periodic-review inventory systems with concave ordering costs. At each period, an ordering quantity and a selling price of the product are determined simultaneously. Demand is r...

This paper is concerned with a generalization of classical inventory models (with xed ordering costs) that exhibit (s; S) policies. In our model, the distribution of demands in successive periods is dependent on a Markov chain. The model includes the case of cyclic or seasonal demand. The model is further extended to incorporate some other realistic features such as no ordering periods and stor...