in this paper, we develop an inventory model for perishable items with random lifetime in a two-echelon production-distribution system. there is a manufacturer at the first stage that produces its product with a constant rate. deterioration in this stage is modeled via a two-parameter weibull distribution. at the second stage, the retailer places the order and receives the product instantly. th...

While there has been a growing body of work on word embeddings, and recent directions better reflect sense-level representations, evaluation remains a challenge. We propose a method of query inventory generation for embedding evaluation that recasts the principle of subsumption preservation, a desirable property of semantic graph-based similarity measures, as a comparative similarity measure as...

Full, accurate and evident information about stocks is a key factor of successful inventory management process. Effective inventory management should include a comprehensive solution, based on mathematical methods and control of current balances and software. Such solution for small businesses should be effective and should not be too expensive. The paper shows an approach to using database tec...

in a novel dual bed reactor fischer-tropsch synthesis was studied by using two diffrent cobalt catalysts. an alkali-promoted cobalt catalyst was used in the first bed of a fixed-bed reactor followed by a rutenuim promoted cobalt catalyst in the second bed. the activity, product selectivity and accelerated deactivation of the system were assessed and compared with a conventional single bed react...

 It is scientifically challenging to determine the inventory level all through the supply chain in such a way that the desired objectives such as effectiveness and responsiveness of the supply chain system can be obtained. Simulation is a means for solving various problems which cannot be solved by regular exact models such as mathematical ones due to their complexity. The present paper is aime...

Vendor managed inventory is a continuous replenishment program that is designed to provide major cost saving benefits for both vendors and retailers. Previous research on this area mainly included single objective optimization models where the objective is to minimize the total supply chain costs or to maximize the total supply chain benefits. This paper presents a bi-objective mathematical mod...