Henry L. Pierce Laboratory Seminar Series -Prof. Özlem Ergun

Wednesday, October 10, 2018 at 4:00pm to 5:00pm

Deterministic and Stochastic Road Network Recovery Problems


Due to the ubiquitous nature of disruptive extreme events, functionality of the critical infrastructure systems (CIS) is constantly at risk. In case of a disruption, in order to minimize the negative impact to the society, service networks operating on the CIS should be restored as quickly as possible. In the context of debris removal after a disruptive event, the problem is defined as finding a schedule to clear the roads with the limited resources, the road network recovery problem (RNRP).  First, we consider RNRP with deterministic demand on the disaster sites. We introduce a novel network science inspired measure to quantify the criticality of disrupted network components and develop a restoration heuristic (Cent-Restore) that schedules the clearance of the roads based on this measure. We use Cent-Restore to recommend real-time restoration plans for disrupted road networks of Boston and Manhattan and analyze the performance of the plans over time through resilience curves. We compare Cent-Restore to the current restoration guidelines proposed by FEMA and other strategies that prioritize the restoration efforts based on different measures. As a result we confirm the importance of including specific post-disruption attributes of the networks to create effective restoration strategies.  Moreover, we explore the relationship between a service network’s resilience and its topological and operational characteristics under different disruption scenarios. Second, we will discuss preliminary work on RNRP with stochastic demand.


Dr. Özlem Ergun is a professor at Mechanical and Industrial Engineering at Northeastern University. Dr. Ergun’s research focuses on design and management of large-scale and decentralized networks. She has applied her work on network design, management, and resilience to problems arising in many critical systems including transportation, pharmaceuticals, and healthcare.  She has worked with organizations that respond to emergencies and humanitarian crises around the world, including USAID, UNWFP, UNHCR, IFRC, OXFAM America, CARE USA, FEMA, USACE, CDC, AFCEMA, and MedShare International. Dr. Ergun is currently serving as a member of the National Academies Committee on Building Adaptable and Resilient Supply Chains after Hurricanes Harvey, Irma, and Maria. Within INFORMS, Dr. Ergun has been a leader in establishing a strong community of OR/MS professionals with an interest in public programs.  She was the Past-President, President, and President-elect of INFORMS Section on Public Programs, Service and Needs, 2012-2014. She currently serves as the Area Editor at the Operations Research journal for Policy Modeling and the Public Sector Area. Dr. Ergun is also a founding co-chair of the Health and Humanitarian Logistics Conference, held annually since 2009. In addition, Dr. Ergun was the Vice President of Membership and Professional Recognition on the INFORMS Board of Directors, 2011 - 2015.  Prior to joining Northeastern she was the Coca-Cola Associate Professor in the School of Industrial and Systems Engineering at Georgia Institute of Technology, where she also co-founded and co-directed the Health and Humanitarian Systems Research Center at the Supply Chain and Logistics Institute.  She received a B.S. in Operations Research and Industrial Engineering from Cornell University in 1996 and a Ph.D. in Operations Research from the Massachusetts Institute of Technology in 2001.



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Civil and Environmental Engineering
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