Abstract : In this paper a meta-heuristic approach has been presented to solve lot-size determination problems in a complex multi-stage production planning problems with production capacity constraint. This type of problems has multiple products with sequential production processes which are manufactured in different periods to meet customer’s demand. By determining the decision variables, mac...

Abstract In contrast to other kinds of biological interactions, symbiosis is a scarcely investigated aspect the fossil record. This largely due taphonomic biases that often frustrate any attempt make strong case two organisms shared an intimate association in life. Among extant marine vertebrates, sea turtles (Cheloniidae and Dermochelyidae) bear broad diverse spectrum epibiotic symbionts, incl...

SUMMARY Although sciences and techniques have been significantly developed, many patients are still suffering from diagnostic and therapeutic problems of vestibular system, specially vertigo. Perhaps, these problems are not solved yet mostly because the neurophysiology of vestibular system and the stimulation mechanisms of the receptors are not known. This difficulty, intum, causes some a mbig...

in this paper, the distribution network for multi-level supply chain has been studied. products produced in factories are sent to customers through warehouses and distribution centers based on specific demands. warehouses as holding inventory facilities are located close to factories and the distribution centers are placed in the most accessible locations for services near customers. each item ...

Urbanism in third world and developing countries compared to that of developed countries has been increased with much more speed. From consequences of the population increase and accelerated growth of population in cities, reference can be lead to many problems such as increase of unemployment rate, housing problems, social anomalies, increase in crime and delinquency. Vandalism in public space...