TY - JOUR ID - 4048 TI - An Integrated Model for a Two-supplier Supply Chain with Uncertainty in the Supply JO - Journal of Industrial and Systems Engineering JA - JISE LA - en SN - 1735-8272 AU - Sajadifar, Mehdi AU - Pourghannad, Behrooz AD - Department of Industrial Engineering, University of Science and Culture, Tehran, Iran Y1 - 2011 PY - 2011 VL - 5 IS - 3 SP - 154 EP - 174 KW - Supply chain management KW - Unreliable Supply KW - Continuous Review Policy KW - Poisson Demand KW - Non-Zero Lead-time DO - N2 - The objective of this paper is to study an integrated two-supplier supply chain whose suppliers are unreliable. An unreliable supplier is alternative between available (ON) and unavailable (OFF) states which are considered to be independent exponential variables. The suppliers apply a continuous review policy and the retailer uses an adapted continuous review base on an(R,Q) policy. Transportation times are constant and lead times are non-zero random variables. The retailer faces independent Poisson demands. Using the idea of the one-for-one ordering policy, we implicitly incorporate the distribution function of the random delay for obtaining the value of the expected costs of system. Finally, resorting to a dozen of sample problems, we show that the average cost reduction in our inventory system is at least 3.69% and at most 36.95% comparing to the one with only one supplier. UR - https://www.jise.ir/article_4048.html L1 - https://www.jise.ir/article_4048_34281b5ba5fba63949c2d21fdc8552c8.pdf ER -