دانلود رایگان مقاله انگلیسی همبستگی استراتژیک و استراتژی های ریسک کاهش خطر در شبکه های عرضه - الزویر 2018

Abstract

A supply network’s performance is affected by two types of risk: 1) risk of disruptions that distort the supply network’s topology by inactivating certain production facilities or transportation lanes; and 2) risk of variations in a facility’s performance that reduce the efficiency of the supply network’s flow planning for fulfilling demands. In this paper, we demonstrate that strategic and operational risk mitigation strategies, which neutralize the impacts of disruptions and variations, respectively, are correlated. We consider “Robustness” and “Resilience” at a strategic level to mitigate disruptions and “Reliability” at an operational level to mitigate variations. A mixed integer stochastic mathematical model is developed to simultaneously a) design a robust and resilient topology for supply networks; and b) plan a reliable flow throughout its topology. We solve the model using an example of a profit-based supply network that is constructed by relying on the assumptions that were primarily used in prior studies. A sensitivity analysis of the results from the model indicates that i) the correlation between robustness and resilience is negative; ii) the correlation between robustness and reliability is positive; and iii) the correlation between resilience and reliability is negative.

6. Conclusions

In this study, we classify SN risks into two groups: 1) variations that affect flow planning decisions and 2) disruptions that affect the topology design decisions of the SN. We develop a model in Section 4 to plan a reliable flow for SNs to manage downstream and upstream variations by assigning the optimal local reliabilities to facilities (ORM strategies). We extend the model constructed in Section 4 in Section 5 by considering the possibility of disruptions. This model redesigns a robust and resilient network structure by adding flexibility levels and flexibility speeds to facilities (SRM strategies). Finally, we analyze the correlations among reliability, robustness, and resilience. Our results demonstrate that in profit-based SNs 1) the correlation between robustness and resilience is negative; 2) the correlation between robustness and reliability is positive; and 3) the correlation between resilience and reliability is negative.