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On a general standby system and its optimization

100%

Cha J. H. , Yun W. Y.

tom Vol. 1

95--100

Redundancy or standby is a technique that has been widely applied to improving system reliability and availability in the stage of system design. In this paper, we consider a standby system with two units in which the first unit (unit 1) starts its operation under active state and the other unit (unit 2) is under cold standby state at the starting point. After a specified time s (switching time), the state of unit 2 is changed to warm standby state and, as soon as the operating unit 1 fails, the state of unit 2 is changed to active state. If unit 1 fails before times, the system fails. Units can fail at both active and warm standby states. A general method for modeling the standby system is adopted and, based on it, system performance measures (system reliability and mean life) are derived. We consider the problem of determining optimal switching time which maximizes the expected system life. Some numerical examples are studied.

Efficient cost savings in the procurement procedures of industrial enterprises

72%

Pleschenko V.

tom Vol. 2, No. 1

17-30

Cost saving is one of the most important factors for sustainability of the industrial enterprise. The company must optimize its procurement process, monitor and forecast of market prices, search and introduce alternative, select future partners carefully and apply optimal procedures. Also the buyer has to distribute the orders among suppliers, motivate them in cooperation and promote competition between suppliers. It is important to evaluate the transaction costs for buyer and participants before announcement of the tender, compare them with the parameters of the transaction and the market situation. The article shows growing costs in case of superposition of procurement cycles, and notes that the switch is characterized not only by cost but also time figures. It is concluded that the minimization of switching time leads to cost saving.