We consider a multi-period order selection problem in ̄exible manufacturing systems, which is the problem of selecting orders to be produced in each period during the upcoming planning horizon with the objective of minimising earliness and tardiness costs and subcontracting costs. The earliness and tardiness costs are incurred if an order is not ®nished on time, while subcontracting cost is incu...

this paper presents a theoretical approach to implementation of the “multi-realization of nonlinear mimo systems”. this method aims to find state-variable realization for a set of systems, sharing as many parameters as possible. in this paper a special nonlinear multi-realization problem, namely the multi-realization of feedback linearizable nonlinear systems is considered and an algorithm for ...

in this article, a finite horizon, multi product and multi period economic order quantity like seasonal items is considered where demand rate is deterministic and known but variable in each period. the order quantities of items come in batch sizes and the end of the period order quantity and, consequently, demand of customers are zero. in addition, storage space is constrained and the problem ...

In order to gain possible hints for planet formation from the current data of known extra-solar planets, period-ratios and mass-ratios adjacent pairs in multi-planet systems are determined. A moderate period-ratio-mass-ratio correlation is found have a coefficient r=0.5779 with 99% confidence interval (0.464, 0.672). contrast, non-adjacent pairs, r=0.2820 (0.133, 0.419). Our results reveal impr...