This paper is concerned with the minimisation of the update response time in distributed database systems (DDBS) where resequencing algorithms are used to preserve the consistency of the databases. The authors proposed a novel resequencing technique, in reference [7], namely hop-by-hop resequencing with batch processing for connecting the first stage to the second stage of a two-stage DDBS. In ...

We present two results to aid the numerical solution of the notoriously di¢ cult discrete-time inventory model with stochastic demands, a constant leadtime, and lost sales. First, we show that the e¤ective state space is a relatively manageable compact set. Second, we show that the optimal cost is increasing in the leadtime, and we use this fact to construct a good lower bound on the optimal-co...

This research presents a model for optimal allocation of Iranian oil and gas resources in sanction condition based on stochastic linear multi-objective programming. The general policies of the resistive economy include expanding exports of gas, electricity, petrochemical and petroleum products, expanding the strategic oil and gas reserves, increasing added value through completing the petroleum...

in this research, we address the application of uncertaintyprogramming to design a multi-site, multi-product, multi-period,closed-loop supply chain (clsc) network. in order to make theresults of this article more realistic, a clsc for a case study inthe iron and steel industry has been explored. the presentedsupply chain covers three objective functions: maximization ofprofit, minimization of n...

In recent decades, fractional order calculus has become an important mathematical tool for effectively solving complex problems through better modeling with the introduction of differential/integral operators; swarming heuristics are also introduced and applied performance in different optimization tasks. This study investigates nonlinear system identification problem input control autoregressi...

assembly lines are special kinds of production systems which are of great importance in the industrial production of high quantity commodities. in many practical manufacturing systems, configuration of assembly lines is fixed and designing a new line may be incurred huge amount of costs and thereby it is not desirable for practitioners. when some changes related to market demand occur, it is wo...

When metro systems need to be temporarily closed due an unexpected disruption, the operators have arrange shuttle buses as alternative transport for trains, while passengers find new routes complete their journeys. However, additional bus lines might redundant if well-known phenomenon of “Braesss Paradox” exists. To address this issue, paper proposes a bi-level programming model in which object...