Informs Annual Meeting Phoenix 2018

INFORMS Phoenix – 2018

TC49

those products to benefit from economies of scale. Products made by different producers or sold in different markets might still be considered for joint recycling. Our main question is when and whether firm-based recycling strategies or market-based recycling strategies emerge as stable outcomes. We show that with intense market competition and differentiated market sizes, producers may recycle their products on their own without cooperating with others. 3 - Integration of Industry 4.0 Into Supply Chain Management to Increase Value Creation Towards Sustainability Ozden Tozanli, PhD Candidate, University of Bridgeport, Engineering & Technology Building, 126 Park Ave, Bridgeport, CT, 06604, United States, Elif Kongar Today’s dynamic market environment dramatically triggers the growing demand for customized products conjointly with the expanding operational layers in value chains. To address this, companies need to realign their long-term business strategies to adopt to the vision of future-oriented technologies. With this aim, this case study discusses the utilization of Industry 4.0 in supply chain management towards sustainability in order to increase the value-adding capability of a recycling company. The proposed results aim at delivering a new perspective to the traditional value chain in terms of economically, environmentally, socially, and technologically adaptable infrastructures. 4 - A Balanced Scorecard-based Approach to Integrate Sustainability Into the Operational Performance: A Food Industry Case Study Gazi Duman, University of Bridgeport, CT, United States, Elif Kongar Increasing environmental and social awareness and accompanying governmental legislations are now requiring companies to integrate these two aspects into their performance evaluations. With this motivation, this study proposes a Balanced Scorecard (BSC)-based approach combining Decision-Making Trial and Evaluation Laboratory (DEMATEL) and Analytic Network Process (ANP) methodologies for performance evaluation. To demonstrate the functionality of the approach, a case study is conducted on a U.S.-based food franchise. 5 - Resource Conservation vs. Waste Reduction: An Investigation Avinash Geda, University of Florida, 361B Stuzin Hall, Gainesville, FL, 32611, United States, Vashkar Ghosh, Gulver Karamemis, Asoo J. Vakharia This research examines whether the use of recycling to promote resource conservation, also reduces landfill waste. By analyzing a two-stage (OEM-waste management firm) supply chain, conditions under which these environmental objectives are in conflict are characterized. n TC49 North Bldg 230 Joint Session ENRE/Practice Curated: Underground Applications Joint Session Chair: Alexandra M. Newman, Colorado School of Mines, Golden, CO, 80401, United States 1 - Production Scheduling in Underground Mine Operations Incorporating Heat Loads Oluwaseun Babatunde Ogunmodede, Colorado School of Mines, 7216 Winter Ridge Drive, Castle Pines, CO, 80108, United States Mine production scheduling determines when, if ever, notional three- dimensional blocks of ore should be extracted. The accumulation of heat in the tunnels where operators are extracting ore is a major consideration when designing a ventilation system and, often, the production scheduling and ventilation decisions are not made in concert. Rather, heat limitations are largely ignored.Out model maximizes net present value subject to additional constraints onprecedence, and mill and extraction capacities. The model produces morerealistic schedules that could increase revenue by lowering ventilation costs forthe mine— specifically, refrigeration costsinfluenced by fans in the mine. 2 - Hybrid Design and Scheduling for Underground Mining Peter Nesbitt, MS, Colorado School of Mines, Golden, CO, 80401, United States, Levente Sipeki, Alexandra M. Newman Underground mine design is inextricably intertwined with the corresponding production schedules. For deposits that extend deep underground, the mining direction that dictates a most profitable extraction sequence at the highest vertical level may not correspond to that at the deepest level. We formulate a mixed- integer program that determines a design and corresponding production schedule by exploiting the underlying mathematical structure. Solutions yield a more realistic production profile than a traditional one, resulting in an increased quantity of gold ounces pulled forward in the schedule and, hence, higher net present value. 3 - Risk Adverse Optimization for the Ultimate Pit Problem Gianpiero Canessa, Universidad Adolfo Ibanez, 2540 Diagonal Las Torres, Santiago, Chile, Bernardo Kulnig Pagnoncelli, Eduardo Moreno

In this work we discuss different risk averse approaches for the ultimate pit problem. We consider two sources of uncertainty, ore grade and price, and analyze the solutions using different risk measures. We compare the results of our experiments using the risk neutral case as a benchmark, and discuss the advantages of incorporating risk aversion in the construction of an ultimate pit. 4 - Does Supply Chain Visibility Affect Operating Performance? Evidence from Conflict Minerals Disclosures Caroline Swift, The Pennsylvania State University, University Park, PA, United States, V. Daniel R. Guide, Suresh Muthulingam Firms are increasingly held accountable for their suppliers’ transgressions. Consequently, firms need to develop supply chain visibility (SCV) to exercise control and mitigate risks in their supply chains. We use data from the U.S. conflict minerals disclosure legislation to assess firms’ SCV. Then, we compare the operating performance and market value of firms with high SCV against those with low SCV. We find that firms with high SCV achieve higher profitability, productivity, and market valuation than comparable firms with low SCV. We find no discernible difference in sales between firms with high SCV and firms with low SCV. n TC50 North Bldg 231A Pricing and Revenue Management in the Real World Sponsored: INFORMS Section on Practice (formerly CPMS) Sponsored Session Chair: Shuguang Ji, Revenue Analytics, Atlanta, GU, 30339, United States 1 - Moderator - Pricing and Revenue Management in the Real World Shuguang Justin Ji, PhD, Revenue Analytics, Inc., Atlanta, GA, 30339, United States Panelists - Pricing and Revenue Management in the Real World Andres Iroume, Georgia Institute of Technology, 251 10th Sreet NW, # B704, Atlanta, GA, 30318, United States Shuguang Ji, Revenue Analytics, Atlanta, GU, 30339, United States n TC51 North Bldg 231B Practice- Production & Scheduling Contributed Session Chair: Emre Eryigit, UMass, 336 East Hadley Road, Amherst, MA, 01002, United States 1 - Optimal Structure of Joint Inventory and Pricing Management with Dual Suppliers Xiaoyi Feng, AMSS, Beijing, China, Yangyang Xie, Houmin Yan We consider a joint inventory-pricing control problem for a single-product, periodic-review, dual-supplier problem. We assume stochastic supply and demand. By extending the definition of stochastically linear in mid-point to a multidimensional setting, we prove the joint concavity of the profit functions and characterize the optimal expedited order as a state-dependent almost-threshold policy. We further clarify the forms of the stochastic supply and demand functions that guarantee the antimultimodularity of profit functions. With the antimultimodular structure, we characterize the optimal regular order and list price policies as monotone with ordered changing rates. 2 - Operations Research Approaches to Mitigate Ergonomic Risks in Manufacturing Systems Olga Batta a, ISAE-Supaero, 10 av Belin, Toulouse, 31400, France, Alena Otto To reduce ergonomic risks at workplaces, most companies take the workers’ task assignment as given and look for introducing specialized equipment and support tools. However, such policies have limited impact in many cases. The use of operations research approaches allows incorporating ergonomics aspects in the work assignment and scheduling and shows a high potential for improving working conditions in manufacturing systems. In this talk, we review the available modelling approaches that consider ergonomics in operational planning of manufacturing systems and outline future research directions. 3 - A Data-driven Approach to Test Center Scheduling Nickolas K. Freeman, University of Alabama, 14485 Griffin St, Tuscaloosa, AL, 35405, United States, John Mittenthal In this paper, we present a data-driven approach for scheduling students at an academic testing center. In addition to describing the approach, we present results from a benchmarking experiment based on real data. The results show that the proposed scheduling method can improve the utilization of the testing center

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