Informs Annual Meeting Phoenix 2018

INFORMS Phoenix – 2018

TB49

3 - How Blockchain can Disrupt the Supply Chain Sara Saberi, Worcester Polytechnic Institute (WPI), Washburn Rm 217, Foisie School of Business, Worcester, MA, 01609, United States Blockchain technology is increasingly being used in supply chain networks and logistics. With the absence of a central authority, blockchain technology provides a transparent, immutable, and authenticated platform that has a potential to provide traceability to manage sustainability practices and address economic, environmental, and social facets. However, as a disruptive technology, blockchain implementation would change supply chain cross-functional, cross-firm processes and require preparation. We explore various barriers, which stem from system limitations, different level of organizational activities through supply chain, and external authorities. 4 - The Cloud Supply Chain: Cyber-security Implications of the Hidden Chain Steve New, University of Oxford, Oxford, United Kingdom, Olusola Akinrolabu, Andrew Martin Cloud computing has revolutionised IT - but the revolution has complex implications for organizations wishing to understand their place in the electronic ecosystem. For many managers, cloud computing is a release from having to worry about the mundane details, allowing a focus on core competencies.But the cloud offerings are often opaque and sometimes deceptive: how exactly is the IT service being delivered? What services and systems are involved? Which companies are involved? This discussion will explore the fundamental questions of transparency, and describe initial efforts towards methods of mapping and risk assessment of the Cloud Supply Chain. 5 - Exemplars of Supply Chain Disclosure Innovations Donna Marshall, University College Dublin, Carysfort Road, Dublin, Jakob Rehme, Lucy McCarthy, Paul McGrath This study examines exemplar companies and the different methods they use to gather, analyse and publish supply chain sustainability disclosure in the public domain. Some of the world’s most recognisable companies in the food, fashion, electronics, personal care, healthcare and homeware industries are presented in order to understand innovations in supply chain sustainability information disclosure and how these can be adapted for companies who are beginning their disclosure journey. n TB49 North Bldg 230 Joint Session ENRE/Practice Curated: Open Pit and Underground Mining Applications Joint Session Chair: Alexandra M. Newman, Colorado School of Mines, Golden, CO, 80401, United States 1 - Managing Production Incidents in Mining using Multistage Stochastic Programming Bernardo Kulnig Pagnoncelli, Universidad Adolfo Ibanez, Diagonal Las Torres 2640 Penalolen Of. 533-C, Santiago, 7910000, Chile, Lorenzo Reus, Margaret Armstrong In this work, we consider a long-term mine planning model in the presence of price uncertainty and production incidents. The decision maker must satisfy minimum production levels established by contracts and can hedge against uncertainty by stocking material at a cost. We solve a large scale multistage stochastic programming model using decomposition methods and derive an optimal policy for any realization of the uncertain parameters. 2 - Dispatching Policies in Open Pit Mining Amanda G. Smith, University of Wisconsin-Madison, 1513 University Avenue, Mechanical Engineering Bldg, Madison, WI, 53706, United States, Jeff T. Linderoth, James Luedtke The open pit mine truck dispatching problem seeks to determine how trucks should be routed through a mine. Among the challenges of the dispatching problem is the need to balance the distinct objectives of meeting production and quality targets in a dynamic mining environment. We propose an optimization- driven approach to solving the dispatching problem via a MIP model. We also propose two competing policies that match dispatching decisions to rate targets obtained from a nonlinear flow rate model. To evaluate the policies, we use a discrete-event simulation of an open-pit mine. We conclude with computational results demonstrating how each policy performs on mines with different characteristics.

3 - Optimal Selection of Support Pillars in an Underground Mine Levente Sipeki, Colorado School of Mines,, Golden, CO, 80128, United States, Alexandra M. Newman, Candace Arai Yano We address the design optimization problem for a mine utilizing the top-down open-stope retreat mining method. Earth below the surface is divided into three- dimensional rectangular blocks. The mine design specifies which blocks are left behind as pillars to provide geotechnical structural stability; the remainder are extracted and processed. We maximize profit subject to geotechnical stability constraints and develop an iterative heuristic in which violated constraints are incorporated into the formulation until all required geotechnical constraints are satisfied. Our approach provides solutions whose estimated profit is 5% better that what industry-standard methods provide. 4 - Adaptive Scheduling under Uncertainty: Application to Open Pit Mining Patricio Andres Lamas, Universidad Adolfo Ibanez, Santiago, Chile, Marcos Goycoolea, Bernardo Kulnig Pagnoncelli In the mining industry, schedules are executed under high levels of uncertainty. Traditional scheduling approaches dealing with uncertainty consist of initially fixing an (execution-) policy class and then finding an optimal policy within such a class. These approaches have been successful in making the problem computationally tractable. However, initially fixing a policy class has a negative impact on the optimality of the schedules. We propose a less restrictive approach, which creates schedules that adapt to the uncertainty that is partially realized during execution. The adaptive capability of our approach leads to schedules that dominate those derived from the existing approaches. n TB50 North Bldg 231A Joint Session Practice/Practice Curated: O.R. Applications in Medicine Sponsored: INFORMS Section on Practice (formerly CPMS) Sponsored Session Chair: Umit Deniz Tursun, University of Illinois, Champaign, IL, 61822, United States 1 - Evaluation of Dexketoprofen Trometamol Ef?cacy in Postoperative Pain Management for Open Heart Surgery Umit Deniz Tursun, University of Illinois, 3308 Sharp Drive, Champaign, IL, 61822, United States To evaluate comparative statistical analgesic ef?cacy, opioid-sparing, and opioid- related adverse effects of intravenous dexketoprofen trometamol in combination with iv morphine postoperative open-heart surgery. Past data set and outcome predictions of different patient groups based on age and set of patient markers are presented. The opioid requirement is found to be lowered by %55 2.7 with %95 reliability. Routine addition of dexketoprofen trometamol to patient controlled analgesia morphine postoperative open-heart surgery is recommended as an alternative and ef?cacious method. The alternate postoperative pain therapy protocols are presented. Panelists Dr. Filiz Dokan, MD, Kosuyolu High Specialized Training and Research Hospital, Istanbul, 34865, Turkey Umit Tursun Ozer, PhD, University of Illinois Urbana-Champaign, Champaign, IL, 61822, United States Umit Deniz Tursun, University of Illinois, 3308 Sharp Drive, Champaign, IL, 61822, United States n TB51 North Bldg 231B Practice- Production & Scheduling I Contributed Session Chair: Carlos Monardes, Pontificia Universidad Catolica de Chile, Avenida Vi, Santiago, Chile, 1 - Flexible Decisions and Flexible Resources: A Balance for Efficient Operations Alejandro MacCawley, Catholic University of Chile, Santiago, Chile, Elbio Avanzini, Jorge R. Vera, Sergio Maturana

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