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2016

Operations and Supply Chain Management

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Full-Text Articles in Business

Mid-Level Procurement Manager Leader Development: A Collective Case Study, Douglas Veatch Dec 2016

Mid-Level Procurement Manager Leader Development: A Collective Case Study, Douglas Veatch

Doctoral Dissertations and Projects

The development of high-performing employees with the potential to assume leadership roles remains a vital exercise for organizations. Public and private sector organizations of all sizes have implemented programs focused on developing the next generation of leaders. The researcher explored the issue of how a national service industry organization is experiencing varied levels of success of leader development in the case of geographically dispersed mid-level procurement managers in the trucking logistics group. Guided by elements of successful leader development programs, the purpose of this collective qualitative case study was to discover the common issues and factors that lead to success …


Predicting The Performance Of Queues: A Data Analytic Approach, Kum Khiong Yang, Cayirli Tugba, Mei Wan Low Dec 2016

Predicting The Performance Of Queues: A Data Analytic Approach, Kum Khiong Yang, Cayirli Tugba, Mei Wan Low

Research Collection Lee Kong Chian School Of Business

Existing models of multi-server queues with system transience and non-standard assumptions are either too complex or restricted in their assumptions to be used broadly in practice. This paper proposes using data analytics, combining computer simulation to generate the data and an advanced non-linear regression technique called the Alternating Conditional Expectation (ACE) to construct a set of easy-to-use equations to predict the performance of queues with a scheduled start and end time. Our results show that the equations can accurately predict the queue performance as a function of the number of servers, mean arrival load, session length and service time variability. …


Appointment Sequencing: Why The Smallest-Variance-First Rule May Not Be Optimal, Qingxia Kong, Chung-Yee Lee, Chung-Piaw Teo, Zhichao Zheng Dec 2016

Appointment Sequencing: Why The Smallest-Variance-First Rule May Not Be Optimal, Qingxia Kong, Chung-Yee Lee, Chung-Piaw Teo, Zhichao Zheng

Research Collection Lee Kong Chian School Of Business

We study the design of a healthcare appointment system with a single physician and a group of patients whose service durations are stochastic. The challenge is to find the optimal arrival sequence for a group of mixed patients such that the expected total cost of patient waiting time and physician overtime is minimized. While numerous simulation studies report that sequencing patients by increasing order of variance of service duration (Smallest-Variance-First or SVF rule) performs extremely well in many environments, analytical results on optimal sequencing are known only for two patients. In this paper, we shed light on why it is …


Least Squares Approximation To The Distribution Of Project Completion Times With Gaussian Uncertainty, Zhichao Zheng, Karthik Natarajan, Chung-Piaw Teo Nov 2016

Least Squares Approximation To The Distribution Of Project Completion Times With Gaussian Uncertainty, Zhichao Zheng, Karthik Natarajan, Chung-Piaw Teo

Research Collection Lee Kong Chian School Of Business

This paper is motivated by the following question: How to construct good approximation for the distribution of the solution value to linear optimization problem when the random objective coefficients follow a multivariate normal distribution? Using Stein’s Identity, we show that the least squares normal approximation of the random optimal value can be computed by estimating the persistency values of the corresponding optimization problem. We further extend our method to construct a least squares quadratic estimator to improve the accuracy of the approximation; in particular, to capture the skewness of the objective. Computational studies show that the new approach provides more …


Isscm, Master Of I.S. Cohort, Fall 2016, Raj Soin College Of Business, Wright State University Oct 2016

Isscm, Master Of I.S. Cohort, Fall 2016, Raj Soin College Of Business, Wright State University

ISSCM Master Cohort Posters

Poster of the 2016 Cohort from the Master of Information Systems Program.


Isscm, M.S. In Logistics & Scm Cohort, Fall 2016, Raj Soin College Of Business, Wright State University Oct 2016

Isscm, M.S. In Logistics & Scm Cohort, Fall 2016, Raj Soin College Of Business, Wright State University

ISSCM Master Cohort Posters

Poster of the Fall 2016 Cohort from the Master of Science in Logistics and Supply Chain Management Program.


Tls Newsletter October/November 2016, Unf Transportation And Logistics Society Oct 2016

Tls Newsletter October/November 2016, Unf Transportation And Logistics Society

Transportation & Logistics Society Newsletter

Inside the Newsletter: UNF T & L Success Stories November 2nd. Upcoming Events. President's Corner. Get to Know Laurel Richardson, TLS Philanthropy Director. T & L Flagship Program Facility Tour to Dupuy Silo and Quality Lab. The Industry in Jacksonville, Florida. IANA Expo. Jaxport Breaking News. What Not to Miss This Fall: Lunch and Learn, Executive Spotlight, Hubbard House Drive.


The Impact Of Urban Sprawl On Journey To Work Times For Mass Transit And All Other Commuters In The United States: A Research Note, Thomas E. Lambert, Hokey Min, Kyle Dorriere Oct 2016

The Impact Of Urban Sprawl On Journey To Work Times For Mass Transit And All Other Commuters In The United States: A Research Note, Thomas E. Lambert, Hokey Min, Kyle Dorriere

Faculty Scholarship

As government budgets get tighter, there has been considerable public outcry about the continued investment in public mass transit systems and their financial viability. Amid this outcry, a number of studies have been conducted to determine which factors influence the use and efficiency of publicly-funded mass transit systems. These factors include population density and less sprawl (or greater urban compactness). However, their impact on mass transit usage is somewhat contradictory in that the heavy concentration of populations in the urban area and greater compactness is believed to increase mass transit usage due to a bigger number of potential passengers. In …


Optimality Of The Fastest Available Server Policy, William P. Millhiser, Charu Sinha, Matthew J. Sobel Oct 2016

Optimality Of The Fastest Available Server Policy, William P. Millhiser, Charu Sinha, Matthew J. Sobel

Business Faculty Articles and Research

We give sufficient conditions under which a policy that assigns customers to the Fastest Available Server, labelled FAS, is optimal in queueing models with multiple independent Poisson arrival processes and heterogeneous parallel exponential servers. The criterion is to minimize the long-run average cost per unit time. We obtain results for loss models and for queueing systems with a finite-capacity or infinite-capacity buffer under a head-of-the-line priority scheme. The results depend on cost assumptions, so we analyze the robustness of the cost structure and present counter-examples to illustrate when FAS is not optimal.


Tls Newsletter September 2016, Unf Transportation And Logistics Society Sep 2016

Tls Newsletter September 2016, Unf Transportation And Logistics Society

Transportation & Logistics Society Newsletter

Inside the Newsletter: Come on Out to the TLS Boathouse Bash. Upcoming Events. President's Corner. Get to Know Beatrize Gomez, TLS Treasurer. Coggin Welcome Back Cookout. T & L Career Day: New Format. The Industry in Jacksonville, Florida. What Not to Miss This Fall.


Managing Emergency Department Crowding Through Improved Triaging And Resource Allocation, Kum Khiong Yang, Sean Shao Wei Lam, Joyce M. W. Low, Marcus Eng Hock Ong Sep 2016

Managing Emergency Department Crowding Through Improved Triaging And Resource Allocation, Kum Khiong Yang, Sean Shao Wei Lam, Joyce M. W. Low, Marcus Eng Hock Ong

Research Collection Lee Kong Chian School Of Business

Long waiting times in emergency departments (EDs) not only reduce patients’ perceived quality of care, but also increase crowding which can adversely affect patients’ outcomes. Waiting time has been found to affect patients’ outcomes and is closely associated with delays in the provision of ancillary services to ED patients by the diagnostic/treatment laboratories. The focus of this study is to improve the flow of ED patients by testing alternative triage processes and capacity of physicians, triage nurses and laboratories. Three alternative triage processes are examined for managing the flow of ED patients through shared and dedicated laboratories across different utilization …


Production Planning Using Evolving Demand Forecasts In The Automotive Industry, Hakan Yildiz, Scott Duhadway, Ram Narasimhan, Sriram Narayanan Aug 2016

Production Planning Using Evolving Demand Forecasts In The Automotive Industry, Hakan Yildiz, Scott Duhadway, Ram Narasimhan, Sriram Narayanan

Business Faculty Publications and Presentations

This paper considers an auto parts supplier who receives order release updates from its customers and revises its production plan for future periods on a weekly basis. The inaccuracy of the order releases causes significant costs in the form of premium expedited transportation, production overtime, and excess inventory. This setting provides a rich context for studying order release variance, because the supply chain has adopted a just-in-time (JIT) approach where ideal inventory levels are kept at zero. This leads to a high reliance on order release accuracy in order to manage production quantities. This paper presents an optimization model that …


The Impact Of The Potential Entry Of Copycats: Entry Conditions, Consumer Welfare, And Social Welfare, Sarah Y. Gao, Wei Shi Lim, Christopher Tang Aug 2016

The Impact Of The Potential Entry Of Copycats: Entry Conditions, Consumer Welfare, And Social Welfare, Sarah Y. Gao, Wei Shi Lim, Christopher Tang

Research Collection Lee Kong Chian School Of Business

This article examines the implications of the potential entry of a copycat who produces and sells a copycat (i.e., imitation) product that competes with the incumbent product. By analyzing a two-period dynamic noncooperative game between these two firms, we identify conditions under which the copycat can gain successful market entry. More importantly, we find that the potential entry of a copycat creates (implicit) pressure for the incumbent to lower its selling price; hence, it improves consumer welfare. Finally, we identify conditions under which the potential entry of a copycat can increase social welfare (i.e., consumer welfare and the profit of …


An Integrated Strategy For A Production Planning And Warehouse Layout Problem: Modeling And Solution Approaches, Guoqing Zhang, Tatsushi Nishi, Sarina D. O. Turner, Keisuke Oga, Xindan Li Jun 2016

An Integrated Strategy For A Production Planning And Warehouse Layout Problem: Modeling And Solution Approaches, Guoqing Zhang, Tatsushi Nishi, Sarina D. O. Turner, Keisuke Oga, Xindan Li

Mechanical, Automotive & Materials Engineering Publications

We study a real-world production warehousing case, where the company always faces the challenge to find available space for their products and to manage the items in the warehouse. To resolve the problem, an integrated strategy that combines warehouse layout with the capacitated lot-sizing problem is presented, which have been traditionally treated separately in the existing literature. We develop a mixed integer linear programming model to formulate the integrated optimization problem with the objective of minimizing the total cost of production and warehouse operations. The problem with real data is a large-scale instance that is beyond the capability of optimization …


Physical And Digital Integration Strategies Of Electronic Device Supply Chains And Their Applicability To Eto Supply Chains, Claudia-Maria Wagner, Colm Ryan Apr 2016

Physical And Digital Integration Strategies Of Electronic Device Supply Chains And Their Applicability To Eto Supply Chains, Claudia-Maria Wagner, Colm Ryan

Books/Book chapters

The growth in the manufacture and distribution of electronic devices presents a source of continuing innovation. Electronic devices are products that integrate physical forms (i.e. hardware) and virtual forms (e.g. software) to deliver value to customers. These forms are very different from a product design and supply chain perspective, but nevertheless they need to work closely together in order to create value for the customers. For electronic device manufacturers, it is important that processes are in place to facilitate the seamless integration of both forms throughout the engineering, production, distribution and support stages of the product lifecycle. This chapter examines …


Cooking And The Books: A Guide To Restaurant Accounting, Lena Lambrou Apr 2016

Cooking And The Books: A Guide To Restaurant Accounting, Lena Lambrou

Honors Projects in Accounting

The restaurant industry is known for particularly low profit margins; this project aims to understand where restaurants spend money and how expenses can be allocated for in this fast-paced environment. Through research of various cost accounting methods and the adaptability of those methods to restaurant culture, activity based costing (ABC) provided the most useful data for the restaurant. This project focuses on small business restaurants, specifically those that serve pizza. The backbone of experimentation for applying these accounting processes is a local pizza restaurant, in which the managers are unaware of how food cost and operating expenses could be combined …


Tls Newsletter. April, 2016, Unf Transportation And Logistics Society Apr 2016

Tls Newsletter. April, 2016, Unf Transportation And Logistics Society

Transportation & Logistics Society Newsletter

Inside the Newsletter: Mark your calendars for an End of Year celebration for April 14, 2016. TLS President's Corner. Get to Know Ryan Moore, Social Director. Cancastle Winners. The Inside Swoop. What's happening in the industry. 8th Annual Spring Banquet April 28, 2016. Life After Graduation with Grant Walker.


Can S'Pore Be An Icon For Service Productivity?, Arnoud De Meyer Apr 2016

Can S'Pore Be An Icon For Service Productivity?, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

The traditional analysis tools or flexible work design deployed in manufacturing may be insufficient in giving a boost to services. For all practical purposes, there are only two ways to create more value per worker and stimulate growth, we need innovation or become more productive.


Ad Revenue Optimization In Live Broadcasting, Dana G. Popescu, Pascale Crama Apr 2016

Ad Revenue Optimization In Live Broadcasting, Dana G. Popescu, Pascale Crama

Research Collection Lee Kong Chian School Of Business

In live broadcasting, the break lengths available for commercials are not always fixed and known in advance (e.g., strategic and injury time-outs are of variable duration in live sports transmissions). Broadcasters actively manage their advertising revenue by jointly optimizing sales and scheduling policies. We characterize the optimal dynamic schedule in a simplified setting that incorporates stochastic break durations and advertisement lengths of 15 and 30 seconds. The optimal policy is a "greedy" look-ahead rule that accounts for the remaining number of breaks; in this setting, there is no value to perfect information at the scheduling stage, and hence knowing the …


Patrol Scheduling In An Urban Rail Network, Hoong Chuin Lau, Zhi Yuan, Aldy Gunawan Apr 2016

Patrol Scheduling In An Urban Rail Network, Hoong Chuin Lau, Zhi Yuan, Aldy Gunawan

Research Collection School Of Computing and Information Systems

This paper presents the problem of scheduling security teams to patrol a mass rapid transit rail network of a large urban city. The main objective of patrol scheduling is to deploy security teams to stations of the network at varying time periods subject to rostering as well as security-related constraints. We present several mathematical programming models for different variants of this problem. To generate randomized schedules on a regular basis, we propose injecting randomness by varying the start time and break time for each team as well as varying the visit frequency and visit time for each station according to …


A Framework For Evaluating Energy Sustainability Efforts In Maritime Terminal Operations, Kar Way Tan, Members Of Green Transformation Lab Apr 2016

A Framework For Evaluating Energy Sustainability Efforts In Maritime Terminal Operations, Kar Way Tan, Members Of Green Transformation Lab

Research Collection School Of Computing and Information Systems

Environmental sustainability at ports has been getting more attention from port operators and port regulators. GHG emissions associated with operations and search for clean energy sources are some issues that are continuously monitored and urgently addressed at leading ports across the world. Singapore port, one of the busiest in the world, is no exception. In the planning for the Singapore’s next generation port, this study helps to provide a framework to learn, evaluate and monitor sustainability initiatives in maritime terminal operations for Singapore and selected international ports.


Strategies To Succeed In An Increasingly Technology-Based Environment: A Study Of The Automotive Industry, Jose Geleilate Mar 2016

Strategies To Succeed In An Increasingly Technology-Based Environment: A Study Of The Automotive Industry, Jose Geleilate

FIU Electronic Theses and Dissertations

This dissertation investigates how firms embedded in an increasingly technology-based industry change their vertical integration and product development strategies in order to remain competitive and increase value capture. The first essay is a theoretical development integrating concepts of industry structure, organizational governance form and innovation in order to disentangle past research’s disagreements and guide future studies. Firms are seen as proactive actors that also have their decisions strongly shaped by structural (architectural) factors. The second essay focus on analyzing how module suppliers achieve a sustained competitive advantage by increasing their focus on modular products and innovations as well as managing …


Electricity Trading And Negative Prices: Storage Vs. Disposal, Yangfang (Helen) Zhou, Alan Scheller-Wolf, Nicola Secomandi, Stephen Smith Mar 2016

Electricity Trading And Negative Prices: Storage Vs. Disposal, Yangfang (Helen) Zhou, Alan Scheller-Wolf, Nicola Secomandi, Stephen Smith

Research Collection Lee Kong Chian School Of Business

Electricity cannot yet be stored on a large scale, but technological advances leading to cheaper and more efficient industrial batteries make grid-level storage of electricity surpluses a natural choice. Because electricity prices can be negative, it is unclear how the presence of negative prices might affect the storage policy structure known to be optimal when prices are only non-negative, or even how important it is to consider negative prices when managing an industrial battery. For fast storage (a storage facility that can both be fully emptied and filled up in one decision period), we show analytically that negative prices can …


Made In Singapore, Plugged Into The World, Arnoud Cyriel Leo De Meyer Mar 2016

Made In Singapore, Plugged Into The World, Arnoud Cyriel Leo De Meyer

Research Collection Lee Kong Chian School Of Business

Manufacturing in Singapore is not an outmoded sector. Instead, it is a job multiplier and can be a source of innovation as well as a vital way to plug the Republic into the global manufacturing network.


Scenario-Based Simulation Game For Hospital Beds Capacity Planning In Singapore, Cheong, Michelle L. F., Li Siong Lim Mar 2016

Scenario-Based Simulation Game For Hospital Beds Capacity Planning In Singapore, Cheong, Michelle L. F., Li Siong Lim

Research Collection School Of Computing and Information Systems

A complete learning object with scenario-based simulation game and accompanying materials, which allows self-directed learners to learn and apply the theory, concepts and calculations for capacity planning, in the hospital beds capacity planning scenario in Singapore, was designed, developed and immplemented. It guides the learners through the key considerations for capacity planning, the computation of actual capacity needed, deciding the time for capacity increments, as well as the economies and diseconomies of scale when adding capacity. All the learnings are applied in a scenario where the learners make decision on how much and when to add hospital beds to existing …


Tls Newsletter. February 2016, Unf Transportation And Logistics Society Feb 2016

Tls Newsletter. February 2016, Unf Transportation And Logistics Society

Transportation & Logistics Society Newsletter

Inside the Newsletter: Mark Your Calendars for T & L Career Day on March 25. President's Corner. Get to Know Emily Millspaw, Newsletter Editor. T & L Flagship Tour to Total Quality Logistics. What's Happening in the Industry. Life after Graduation with Valerie Seaman


Cost-Reducing Innovation And The Role Of Patent Intermediaries In Increasing Market Efficiency, Anupam Agrawal, Shantanu Bhattacharya, Sameer Hasija Feb 2016

Cost-Reducing Innovation And The Role Of Patent Intermediaries In Increasing Market Efficiency, Anupam Agrawal, Shantanu Bhattacharya, Sameer Hasija

Research Collection Lee Kong Chian School Of Business

Patent intermediaries have gained importance as non-practicing entities in the innovation domain, buying innovations from an external provider and then licensing them to practicing firms. In this study, we analyze the competition between two identical incumbent firms and a patent intermediary for the acquisition and licensing of a cost-reducing innovation developed by an external innovator. We show that the outcome of the IP acquisition and licensing game critically depends on the degree of the cost-reducing innovation. Patent intermediaries win IP rights in patent markets if the innovation is incremental. They also win the IP rights when the innovation is moderate …


A Proactive Sampling Approach To Project Scheduling Under Uncertainty, Pradeep Varakantham, Na Fu, Hoong Chuin Lau Feb 2016

A Proactive Sampling Approach To Project Scheduling Under Uncertainty, Pradeep Varakantham, Na Fu, Hoong Chuin Lau

Research Collection School Of Computing and Information Systems

Uncertainty in activity durations is a key characteristic of many real world scheduling problems in manufacturing, logistics and project management. RCPSP/max with durational uncertainty is a general model that can be used to represent durational uncertainty in a wide variety of scheduling problems where there exist resource constraints. However, computing schedules or execution strategies for RCPSP/max with durational uncertainty is NP-hard and hence we focus on providing approximation methods in this paper. We pro- vide a principled approximation approach based on Sample Average Approximation (SAA) to compute proactive schedules for RCPSP/max with durational uncertainty. We further contribute an extension to …


Achieving Stable And Fair Profit Allocation With Minimum Subsidy In Collaborative Logistics, Lucas Agussurja, Hoong Chuin Lau, Shih-Fen Cheng Feb 2016

Achieving Stable And Fair Profit Allocation With Minimum Subsidy In Collaborative Logistics, Lucas Agussurja, Hoong Chuin Lau, Shih-Fen Cheng

Research Collection School Of Computing and Information Systems

With the advent of e-commerce, logistics providers are faced with the challenge of handling fluctuating and sparsely distributed demand, which raises their operational costs significantly. As a result, horizontal cooperation are gaining momentum around the world. One of the major impediments, however, is the lack of stable and fair profit sharing mechanism. In this paper, we address this problem using the framework of computational cooperative games. We first present cooperative vehicle routing game as a model for collaborative logistics operations. Using the axioms of Shapley value as the conditions for fairness, we show that a stable, fair and budget balanced …


Customer Service Through Incoterms, Josh Nichol-Caddy Jan 2016

Customer Service Through Incoterms, Josh Nichol-Caddy

White Papers

Settling for the "one size, fits all" shipping solutions typically offered by large logistics companies, small businesses miss out on customer service options that could help differentiate their products. This paper defines the terms and conditions of all the options Incoterms present.