This paper develops a more general production-inventory model for a one-buyermulti-vendor integrated system. We consider the problems where a manufacturer faces problem from the supply side when sourcing a product from heterogeneous suppliers. The model is extended to the situation with shortage permitted, based on shortage being allowed to occur only for the buyer. A numerical example and sens...

In this paper, we consider an adaptive base-stock policy for a single-item inventory system, where the demand process is nonstationary. In particular, the demand process is an integrated moving average process of order (0, 1, 1), for which an exponential-weighted moving average provides the optimal forecast. For the assumed control policy we characterize the inventory random variable and use th...

We consider a single-product inventory system that serves multiple demand classes, which differ in their shortage costs or service level requirements. We assume a critical-level control policy, and show the equivalence between this inventory system and a serial inventory system. Based on this equivalence, we develop a model for cost evaluation and optimization, under the assumptions of Poisson ...

Inventory decisional environment of short life-cycle products is full of uncertainties arising from randomness and fuzziness of input parameters like customer demand requiring modeling under hybrid uncertainty. Prior inventory models incorporating fuzzy demand have unfortunately ignored stochastic variation of demand. This paper determines an unambiguous optimal order quantity from a set of n f...

• A Multi-Vehicle Cyclic Inventory Routing Problem (MV-CIRP) is studied. MV-CIRP the extension of Single-Vehicle CIRP (SV-CIRP). mixed integer nonlinear programming model formulated. Simulated Annealing algorithm proposed to solve both SV-CIRP and MV-CIRP. This paper presents a new variant which aims determine subset customers be visited, appropriate number vehicles used, corresponding cycle ti...

In development of Homogeneous Charge Compression Ignition (HCCI) engines, simultaneous control of combustion phasing and power output has been a major challenge. In this study, a new strategy is developed to control the engine power output and combustion phasing at any desired operating condition. A single zone thermodynamic model coupled to a full kinetic mechanism of Primary Reference Fuels (...

The objective of this model is to discuss the inventory model for time varying demand and time dependent holding cost. Mathematical model has been developed for determining the optimal order quantity, the optimal cycle time and optimal total inventory cost in fuzzy environment. For defuzzification, graded unit preference integration method is used. Numerical examples are given to validate the p...

In this paper we adopt the common cycle approach to economic lot scheduling problem and minimize the maximum aggregate inventory. We allow the occurrence of the idle times between any two consecutive products and consider limited capital for investment in inventory. We assume the setup times are negligible. To achieve the optimal investment in inventory we first find the idle times which minimi...