Informs Annual Meeting Phoenix 2018

INFORMS Phoenix – 2018

WB27

3 - To Pool or Not to Pool: Queueing Design for Large-scale Service Systems Yunan Liu, North Carolina State University, Raleigh, NC, 27695- 7906, United States, Ping Cao, Shuangchi He, Junfei Huang Two queue structures are commonly adopted in service systems: pooled and dedicated. Although the pooled structure, known to minimize server idleness, is widely used in service systems, this study reveals that the dedicated structure, along with the join-the-shortest-queue policy, could help improve certain service levels such as the probability that waiting time is less than a delay target. Using a fluid model substantiated by asymptotic analysis, we provide performance comparison of the two structures in a queueing system with customer abandonment. We intend to answer the questions: To achieve a specified service level, which structure will be more cost-effective? How many servers can be saved? 4 - Asymptotically Optimal Priority Allocation for Transplant Queueing Systems Xin Liu, Clemson University, Department of Mathematical Sciences, Clemson, SC, 29634, United States, Amin Khademi We study the allocation problem for organ transplant systems. The system is formulated as a two-sided multi-class matching system, in which patients may change classes, or abandon the system. We develop a simple priority policy, and show that the proposed policy is asymptotically optimal under fluid scaling. n WB27 North Bldg 132B Practice- Information Systems I Contributed Session Chair: Jiaying Deng, University of Washington, 4109 Stevens Way, Seattle, WA, 98195, United States 1 - Understanding Post-adoption of Building Information Modeling in Organizations: A Behavior Perspective Pei Ma, Tianjin University, Building 25, Weijin Road, Tianjin, 300072, China Post-adoption is crucial for organizations to realize returns on BIM investment. However, employees rarely use BIM to its fullest potential. We identify exploitation (EI) and exploration (ER), that refer to using BIM in routine way or novel way separately, as two types of usage behaviors. Based on IS continuance model, we examine the impacts of satisfaction (SAT) and perceived usefulness (PU) on ER and EI, and the role of personal innovativeness with IT (PIIT) and organizational support (OS) as moderators. Empirical analysis indicates (1) SAT impacts ER and EI strongly, (2) PU has stronger impact on EI than ER, (3) PIIT positively moderates impacts on ER, (4) OS positively moderates impacts on EI and ER. 2 - Social Responsibility Platforms and Sustainability Reporting Xue Ning, Business School, University of Colorado, Denver, CO, 80202, United States, Dobin Yim, Jiban Khuntia This study suggests and investigates the effect of a governance-practice- performance path for social responsibility platforms. Using a dataset of annual sustainability reports of 683 firms over a three-year period, findings of analysis provide insights to implement and steer sustainability governance to better performance. 3 - How Different Incentives Influence Employee Behavior on Enterprise Social Media Xiaopeng Luo, Beijing University of Posts and Telecommunications, 10 Xitucheng Road, Beijing, 100876, China, Jiayin Qi, Xiangling Fu, Yu Jeffrey Hu Firms are currently eager to apply ESM (Enterprise Social Media) to facilitate internal information sharing. However, employee engagement on ESM decreases over time. Thus, incentives are widely used to motivate participation. In this paper, two different incentives adopted on ESM have been examined in the context of a large state-owned company. By conducting a quasi-experiment based on the data of 11,432 employees, this study indicates the effect of the two incentives are different: group incentives, which reflect a sense of collectivism, are welcomed to strengthen the social relationships. While individual incentives, which show a spirit of egoism, can be harmful to evoke participation. 4 - Can Employees Benefit from Social Capital? The Evidence from an Enterprise Social Media in China Jiaying Deng, University of Washington, Seattle, WA, 98195, United States, Yong Tan In this study, we focus on how employees use the ESM to communicate with each other, and how this communication will affect their collaborative project performance. There’s a trade-off.On the one hand, employees may acquire knowledge from others through communication, both from project team members or other experts outside the team. On the other hand, the convenience

of chat may result in too many communications, which may distract employees from projects they are working on. In this paper, we try to examine these two effects.Our preliminary result shows that with more and more communication, the project performance significantly decreases over time.

n WB28 North Bldg 221A Practice – Logistics II Contributed Session

Chair: Srimathy Mohan, Arizona State University, Department of Supply Chain Management, W.P. Carey School of Management, Phoenix, AZ, 85069-7100, United States 1 - Locating a Biorefinery under Uncertainty Using a Multistage Scenario Tree Javier Faulin, Public University of Navarra, Campus Arrosadia, Department of Statistics and OR, Pamplona, Navarra, 31006, Spain, Adrian Serrano-Hernandez, Luis Cadarso, Alejandro Garcia del Valle This work introduces a case study in which a biorefinery has to be located in Navarre, Spain, considering uncertainty in prices and biomass availabilities. To address this problem, stochastic optimization is employed. A multistage scenario tree featuring strategic and operational scenarios is presented, where operational nodes are rooted in strategic nodes. Then, biorefinery location optimization is reached by solving a mixed integer linear programming model. Promising results are obtained at strategic (location of the facility), tactical (location of collection points), and operational (biomass purchase management) levels. 2 - Sharing Loading Costs for Multi Compartment Vehicles Bruce C. Hartman, Professor, California State University Maritime, Santa Rosa, CA, 95409, United States Cold chains are important in world trade. Loading cold items into multiple compartment vehicles (MCVs) with different temperature compartments can keep goods at proper temperatures, allowing better load consolidation. Constructing the optimal load requires heuristics, and the cost must be allocated in a stable manner to the items being shipped. We outline the MCV loading problem, and suggest the optimization and cost allocation problems be solved together using an inductive approach. Constraints generated inductively from minimal balanced collections of subsets reduce the feasible set, helping heuristics find a stable result faster than optimizing first and allocating later. 3 - Long Term Sorting Plan Model for Ecommerce Logistic Distribution Network Jie Lu, Operations Research Scientist, JD.com, Beijing, China, Hengle Qin A sorting plan organizes the package flows in the distribution network. It determines package flow combinations and the sequence of distribution centers for each origin-destination pair. In this study, we propose an optimal long-term sorting plan model for a distribution network. In particular, a mixed integer programming model with conditional constraints is developed. We derive a reformulation of the problem to handle the conditional constraints using logical equivalence. The results show that the model can handle hundreds of distribution centers and more than six thousands of routes. 4 - A Beam Search Based Method for Single Container Mix Loading Problem Tian Tian, Associate Professor, Dongbei University of Finance and Economics, Shahekou District, 217 Jianshan Street, Dalian, China, Jiafu Tang An audio equipment manufacturer would like to depalletize PSUs and load the individual products, together with other PSUs, into a container, such that the volume utilization of the container is maximized. Once a PSU is depalletized, all of its products must be loaded into the Container. No PSU should be depalletized if the total volume of complete PSUs loaded in the container is not maximized. This problem is named as Single Container Mix-Loading Problem (SCMLP).We prove that SCMLP is a generalized container loading problem. We develop a beam search based two-phase constructive algorithm. We generated 60 test instances and conducted experiments to demonstrate the effectiveness of our approach. 5 - Realizing Business Potentials from Digital Operations in a Smart Port. A Quantitative View on Container Terminal Operations Leif Meier, University of Applied Sciences Bremerhaven, An der Karlstadt 8, Bremerhaven, 27568, Germany Business Managers need to evaluate the impact and potentials from new technologies to change the current situation at any time, i.e. to decrease costs, to increase sales and/or increasing the process flexibility. Therefore, new smart procedures do not require a new thinking in management; they are just another technology that may influence the current business situation. Quant Methods allow unfolding potentials that arise from data-driven-technologies - if we understand and solve the right problems. This study shows potentials - and also limits - from smart Container Terminal operations.

450