Presentation of model for Determination of Optimal Locationof the Parts in Series System in order to Increase System Reliability in Security Nodes of E-Commerce

One of the greatest challenges of the new competitional engineering is to ensure that the costs of system life cycles become minimized; simultaneously the requirements of the system accurate performance in a specific period should be considered. Nowadays, the issue of reliability is particularly important in every security system; because interruptions and stoppage is really dangerous and hazardous for a E-Commerce system from both economical and humanistic aspects. In this paper, the determination of optimal location for series system parts in security nodes is investigated considering cost and reliability factors. The objective functions are reliability increase and costs reduction which are consisted of locating cost and parts replacement. In this paper we present a model purpose to establish a balance between the reliability in security system and costs. All objective functions of the presented model are in the same direction with reliability increment up to a specific amount with the least expenses. The proposed model is a multi-objective one due to the need of optimization. The model has ultimately been changed to a single objective model through the use of goal programming method; and it is evaluated by numerical example using lingo software.