Genetic algorithms and other evolutionary algorithms have been successfully applied to solve constrained minimum spanning tree problems in a variety of communication network design problems. In this paper we enlarge the application of these types of algorithms by presenting a multi-population hybrid genetic algorithm to another communication design problem. This new problem is modeled through a...

Photorefractive (PR) holograms can be fixed with various degrees of success.1-4 These usually involve the replacement of the original electronic charge by a relatively immobile ionic charge. When such holograms are reconstructed, by illuminating with the readout wave, a new dynamic electronic hologram is generated by the spatial interference of the readout and the diffracted waves. The superpos...

The present experiment examined the effects of input/output modality pairings on dual-task performance using the psychological refractory period (PRP) procedure. Four groups of participants performed two tasks composed of the same sets of inputs (visual and auditory) and the same sets of outputs (manual and vocal), but with different input/output modality pairings. Whereas modality pairings had...

in this study, a new stochastic model is proposed to deal with a multi-product, multi-period, multi-stage, multi-site production and transportation supply chain planning problem under demand uncertainty. a two-stage stochastic linear programming approach is used to maximize the expected profit. decisions such as the production amount, the inventory level of finished and semi-finished product, t...

This study proposes a new multi-item inventory model with hybrid cost parameters under a fuzzy-stochastic constraint and permissible delay in payment. The price and marketing expenditure dependent stochastic demand and the demand dependent the unit production cost are considered. Shortages are allowed and partially backordered. The main objective of this paper is to determine selling price, mar...

We consider the problem of outsourcing warranty repairs to outside vendors when items have priorities in service. The manufacturer has a contract with a fixed number of repair vendors. The manufacturer pays a fixed fee for each repair done by a vendor which is independent of the repair type and priority class but depends on the vendor. There are a fixed number of items under warranty, and each ...

In this paper we study the optimal dynamic decision-making problem for a retailer selling a single product and facing price-sensitive, stochastic (multiplicative) demand in each period. Any leftover inventory for a period is carried over and charged a holding cost at the end of the period. Leftovers at the end of the selling horizon earn a non-negative salvage value. On the other hand, any unsa...