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Articles 2191 - 2220 of 3959

Full-Text Articles in Operations and Supply Chain Management

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 …

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Improving The Maritime Transshipment Operations At The Noble Group, Fragkos I., Bert De Reyck Mar 2016

Improving The Maritime Transshipment Operations At The Noble Group, Fragkos I., Bert De Reyck

Research Collection Lee Kong Chian School Of Business

The Noble Group is a market-leading global supply chain manager of agricultural products, metals, and minerals, operating in more than 140 locations. This paper focuses on Noble’s maritime operations in Indonesia, where coal is transported from mines to ocean-bound vessels via roads and rivers. Currently, transportation delays are causing Noble to lose tens of millions of dollars per year in demurrage and detention penalties. Although the company can hire additional resources (such as barges and floating cranes) in advance to minimize the impact of delays, the economic benefit of doing so is often unclear. To reduce or eliminate these delays, …

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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.

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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 …

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Isscm Newsletter, Volume 10, February 15, 2016, Raj Soin College Of Business, Wright State University Feb 2016

Isscm Newsletter, Volume 10, February 15, 2016, Raj Soin College Of Business, Wright State University

ISSCM Newsletters

A ten page newsletter from the Department of Information Systems and Supply Chain Management in the Raj Soin College of Business at Wright State University.

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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

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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 …

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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 …

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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 …

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Isscm Scholarship And Awards 2016, Raj Soin College Of Business, Wright State University Jan 2016

Isscm Scholarship And Awards 2016, Raj Soin College Of Business, Wright State University

ISSCM Awards & Scholarships

Scholarships and Awards presented in the ISSCM Department. This document includes photos of recipients receiving awards.

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Organic Or Contract Support? Investigating Cost And Performance In Aircraft Sustainment, Jonathan D. Ritschel, Tamiko L. Ritschel Jan 2016

Organic Or Contract Support? Investigating Cost And Performance In Aircraft Sustainment, Jonathan D. Ritschel, Tamiko L. Ritschel

Journal of Transportation Management

Over the past 15 years, the United States Air Force (USAF) has shifted toward utilizing more Contracted Logistics Support (CLS) and away from organic maintenance in their aircraft fleets. Given operating and support costs comprise 53-65% of total life-cycle costs for USAF aircraft, understanding the implications of these sustainment decisions is imperative. Utilizing a maintenance cost per flying hour metric and performing regression analysis, we find the maintenance strategy decision (CLS, mixed, or organic) is the most significant driver. We then examine performance metrics in relation to two established aircraft availability targets. Analysis of variance reveals statistically significant differences between …

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Parcel Shipping: Understanding The Needs Of Business Shippers, Michael S. Garver, Zachary Williams, Sean P. Goffnett, Brian J. Gibson Jan 2016

Parcel Shipping: Understanding The Needs Of Business Shippers, Michael S. Garver, Zachary Williams, Sean P. Goffnett, Brian J. Gibson

Journal of Transportation Management

Research on carrier selection addresses how shippers choose carriers. To date, this extensive research stream has not adequately addressed a known and significant shipping segment: business parcel shippers. In this research, input from 374 business parcel shippers was captured and analyzed using Maximum Difference Scaling. The respondents were asked to evaluate the importance of 17 carrier selection variables in regard to choosing a parcel carrier. The overall results indicate that delivery promises, transit times, rates, pick-up promises, and tracking are the most important attributes when a parcel shipper makes a carrier selection. In addition, the results of attribute importance were …

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The Stewardship Of Trust In The Global Value Chain, Kishanthi Parella Jan 2016

The Stewardship Of Trust In The Global Value Chain, Kishanthi Parella

Scholarly Articles

Global governance has not yet caught up with the globalization of business. As a result, our headlines provide daily accounts of the extent and consequences of these "governance gaps." The ability of corporations to evade state control also contributes to an unusual, even frightening, phenomenon: corporations are governing like states. Some governance functions traditionally delivered by state actors are now increasingly undertaken by transnational corporations. One area that is experiencing this substitution is dispute resolution of human rights. Corporations and other business enterprises, individually or collectively, are creating a variety of grievance mechanisms to address human rights and other conflicts …

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Turning To Case Studies As A Mechanism For Learning In Action Learning, Denise O'Leary, Paul Coughlan, Clare Rigg, David Coghlan Jan 2016

Turning To Case Studies As A Mechanism For Learning In Action Learning, Denise O'Leary, Paul Coughlan, Clare Rigg, David Coghlan

Articles

Case studies are a useful means of capturing and sharing experiential knowledge by allowing researchers to explore the social, organisational and political contexts of a specific case. Although accounts of action learning are often reported using a case study approach, it is not common to see individual case studies being used as a learning practice within action learning sets. Drawing on a network action learning (NAL) project, this paper explores how the process of coaching, articulating, authoring, sharing and editing case studies provided a vehicle for learning and research within a NAL set. The intended contribution of this paper to …

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The Leadership Process During An Organizational Crisis, Rodrigo Antônio Silveira Dos Santos, Rodrigo Bandeira De Mello, Cristiano José Castro De Almeida Cunha Jan 2016

The Leadership Process During An Organizational Crisis, Rodrigo Antônio Silveira Dos Santos, Rodrigo Bandeira De Mello, Cristiano José Castro De Almeida Cunha

Strategy and Operations Faculty Publications

This article reports results of a qualitative study that examined the leadership process during an organizational crisis in the Brazilian electrical sector. The studied organization is a company involved with the generation and distribution of electric energy, which faced a crisis because of the rupture of electricity-distribution cables that affected the energy supply chain for a whole city, during approximately 52 hours. In this context, the authors analyzed the crisis’ stages and the organizational crisis management phases, in order to identify the leadership tasks adopted by organizational leaders during the crisis response. The major challenges brought with the crisis were …

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Planning Strategies For Home Health Care Delivery, Mike Hewitt, Maciek Nowak, Nisha Nataraj Jan 2016

Planning Strategies For Home Health Care Delivery, Mike Hewitt, Maciek Nowak, Nisha Nataraj

Information Systems and Operations Management: Faculty Publications & Other Works

In home health care, continuity of care, wherein a patient is always visited by the same nurse, can be just as important as cost, as it is closely correlated to quality of care. While a patient typically receives care for two to three months, such that assigning a nurse to a patient impacts operations for lengthy periods of time, previous research focusing on continuity of care uses planning horizons that are often a week or shorter. This paper computationally demonstrates that considering a long planning horizon in this setting has significant potential for savings. Initially, a deterministic setting is considered, …

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Department Of Information Systems & Supply Chain Management Annual Report, 2015-2016, Raj Soin College Of Business, Wright State University Jan 2016

Department Of Information Systems & Supply Chain Management Annual Report, 2015-2016, Raj Soin College Of Business, Wright State University

ISSCM Annual Reports

A fifty-nine page 2015-2016 annual report from the Department of Information Systems and Supply Chain Management in the Raj Soin College of Business at Wright State University.

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A Scalable Algorithm For Locating Distribution Centers On Real Road Networks, Saeed Ghanbartehrani, Jose D. Porter Jan 2016

A Scalable Algorithm For Locating Distribution Centers On Real Road Networks, Saeed Ghanbartehrani, Jose D. Porter

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

The median problem is a type of network location problem that aims at finding a node with the total minimum demand weighted distance to a set of demand nodes in a weighted graph. In this research, an algorithm for solving the median problem on real road networks is proposed. The proposed algorithm, referred to as the multi-threaded Dijkstra’s (MTD) algorithm, is then used to optimally locate Wal-Mart distribution centers on the 28-million node road network of the United States with the objective of minimizing the total demand weighted transportation cost. The resulting optimal location configuration of Wal-Mart distribution centers improves …

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Evaluating Transaction Pairing Strategies For Vehicle-Based High-Density Storage Systems, Debjit Roy, Harit Joshie Jan 2016

Evaluating Transaction Pairing Strategies For Vehicle-Based High-Density Storage Systems, Debjit Roy, Harit Joshie

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Vehicle-based storage and retrieval systems present an attractive choice for distribution center automation because it provides the flexibility in managing demand fluctuations without affecting transaction throughput times. In this research, we contend that while dual-command cycles can reduce the vehicle travel times for processing transactions, it may not be the best policy for reducing transaction throughput times when transactions arrive at random time instants. We develop stochastic models to test the transaction throughput time performance with multiple pairing strategies and present operational insights.

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Continuous Approximation Of Multi Cycle Time For Multi Aisles Automated Storage And Retrieval Systems., Yassine Boudghene Stambouli, Latefa Ghomri Jan 2016

Continuous Approximation Of Multi Cycle Time For Multi Aisles Automated Storage And Retrieval Systems., Yassine Boudghene Stambouli, Latefa Ghomri

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Knowing that, in an automated storage and retrieval system, the travel time of the storage/retrieval machine is an important parameter which affects the whole system performances, several works were dedicated to its evaluation and its modeling, in single, dual and multi command. These models were proposed for different configurations of AS/RS; such as unit load, multi-aisles and Mobile Racks. These models are based mainly on a discrete approach and the analytical expressions represent the system functioning exactly. In this paper we present a general approach for analytical modeling of multi command cycle time by giving particularly the modeling of the …

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Outsourced Storage And Fulfillment Facility To Enhance The Service Capabilities Of Shopping Mall Tenants, Zachary Montreuil, Mike Ogle Jan 2016

Outsourced Storage And Fulfillment Facility To Enhance The Service Capabilities Of Shopping Mall Tenants, Zachary Montreuil, Mike Ogle

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

This paper proposes development of an Inventory and Fulfillment Center (IFC) that will provide a new range of outsourced, centralized storage and services for shopping mall tenants. The paper describes the competitive issues faced by shopping mall tenants, the requirements and features of a centralized, outsourced storage and fulfillment facility, and development of an agent-based model in AnyLogic® to demonstrate the concept. The range of research and business challenges introduced by this new concept are also presented.

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New Design Guidelines For In-Plant Milk-Run Systems, Thorsten Schmidt, Ingolf Meinhardt, Frank Schulze Jan 2016

New Design Guidelines For In-Plant Milk-Run Systems, Thorsten Schmidt, Ingolf Meinhardt, Frank Schulze

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Tugger trains became a popular means of supply in material handling intensive production systems. In contrast to forklift trucks they interlink a supermarket with multiple delivery locations along a transport route in a milk-run. But the efficiency gain (higher transport capacity, reduced labor costs) has its price: Compared to forklift trucks, planning and dimensioning of in-plant milk-run systems is more complicated. The paper discusses features and drawbacks of a recent standardization approach of the Association of German Engineers (VDI) and highlights the variety of technical restrictions which have to be considered when a milkrun system is designed. It shows, that …

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The Storage Replenishment Problem In Rectangular Warehouses, Haldun Sural, Claudia Archetti, Melih Celik Jan 2016

The Storage Replenishment Problem In Rectangular Warehouses, Haldun Sural, Claudia Archetti, Melih Celik

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

In warehouses, storage replenishment operations involve the transportation of items to capacitated item slots in forward storage area from reserve storage. These items are later picked from these slots as their demand arises. While order picking constitutes the majority of warehouse operating costs, replenishment operations might be as costly in warehouses where pick lists generally consist of only a few lines (e.g., order fulfillment warehouses). In this study, we consider the storage replenishment problem in a parallel-aisle warehouse, where replenishment and order picking operations are carried out in successive waves with time limits. The aim is to determine the item …

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Performance Comparison Of Automated Warehouses Using Simulation, Nand Kishore Agrawal, Sunderesh S. Heragu, Chinnatat Methapatra Jan 2016

Performance Comparison Of Automated Warehouses Using Simulation, Nand Kishore Agrawal, Sunderesh S. Heragu, Chinnatat Methapatra

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

The purpose of this study is to compare the performance of two types of warehouses, both of which use autonomous vehicles (AVs). One warehouse uses movable racks (MR) for storing mini-loads, whereas the other uses fixed racks (FR). In general, warehouse automation not only increases the speed of the fulfillment process but also makes the picking process more accurate. We simulate three scenarios for the MR and FR systems using Simio. Four performance measures are considered for the comparison – the average order processing time (WR), the average utilization of AVs (U), the average order processing queue length (Nq) and …

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Job Sequencing In A Miniload System, Lennart Baardman, Kees Jan Roodbergen Jan 2016

Job Sequencing In A Miniload System, Lennart Baardman, Kees Jan Roodbergen

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

More and more warehouses shift towards the use of automated systems. One such system is a miniload system. In this system, a crane retrieves bins from their storage locations and brings the bins to the picking station, where a worker takes the requested products from the retrieved bins. After a product has been picked, the bin is put back by the crane in its original location. A buffer is present at the picking station to absorb fluctuations in speed between the picker and the crane. The problem of scheduling jobs in this system has received little attention in the literature. …

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Dual-Tray Vertical Lift Modules For Fast Order Picking, Daria Battini, Martina Calzavara, Alessandro Persona, Fabio Sgarbossa Jan 2016

Dual-Tray Vertical Lift Modules For Fast Order Picking, Daria Battini, Martina Calzavara, Alessandro Persona, Fabio Sgarbossa

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

In the last years, new solutions for order picking systems have been developed both from industry and academics, especially for small items. They include innovative flexible automatic parts-to-picker systems and optimized picker-to-parts ones. One of these solutions consists in the use of Vertical Lift Modules (VLMs), a storage column in which small items are stored in extractable trays. In this paper, we study a new system composed by dual-tray VLMs where the operators perform picking and sorting activities. We propose several actions in order to improve the productivity of the entire system: 1) class based storage assignment of items inside …

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Throughput Rate Of A Two-Worker Stochastic Bucket Brigade, Yossi Bukchin, Eran Hanany, Eugene Khmelnitsky Jan 2016

Throughput Rate Of A Two-Worker Stochastic Bucket Brigade, Yossi Bukchin, Eran Hanany, Eugene Khmelnitsky

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Work-sharing in production systems is a modern approach that improves throughput rate. Work is shifted between cross-trained workers in order to better balance the material now in the system. When a serial system is concerned, a common work-sharing approach is the Bucket-Brigade (BB), by which downstream workers sequentially take over items from adjacent upstream work- ers. When the workers are located from slowest-to-fastest and their speeds are deterministic, it is known that the line does not suffer from blockage or starvation, and achieves the maximal theoretical throughput rate (TR). Very little is known in the literature on stochastic self-balancing systems …

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A Performance Measurement Framework And Solution Approach For The Integrated Facility Layout Problem With Uncertain Demand, Melih Celik, Begun Efeoglu, Haldun Sural Jan 2016

A Performance Measurement Framework And Solution Approach For The Integrated Facility Layout Problem With Uncertain Demand, Melih Celik, Begun Efeoglu, Haldun Sural

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

The integrated facility layout problem (IFLP) focuses on the simultaneous determination of the relative locations of multiple copies of capacitated equip- ment or machinery in a facility, as well as the material ow between these units. In this paper, we consider the IFLP in the existence of uncertain demand for the products of the facility. Motivated by the framework for next generation facility layouts by Benjaafar et al. (2002), we extend the approaches in the lit- erature for distributed facility layouts to the case of dynamic demand and the possibility of relayouts, and propose a heuristic solution approach to minimize …

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Transport Items And Physical Internet Handling Boxes: A Comparison Framework Across Supply Chains, Eric Ballot, Benoit Montreuil Jan 2016

Transport Items And Physical Internet Handling Boxes: A Comparison Framework Across Supply Chains, Eric Ballot, Benoit Montreuil

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

Pallets, cardboard boxes, and plastic crates are widely used tools to operate supply chains. As such they have many impacts on handling effort, shipment protection, transport mean utilization as well as repositioning and recycling efforts and they represent billions of assets spread all over the world. The historical and local origins of the designs and the sharing among many stakeholders do not ensure at all any kind of global optimization. The purpose of this paper is to define and explain a research effort to better measure and evaluate the efficiencies and inefficiencies for supply chain stakeholders for themselves and globally. …

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Energy And Cycle Time Efficient Warehouse Design For Autonomous Vehicle-Based Storage And Retrieval System, Banu Yetkin Ekren, Tone Lerher Jan 2016

Energy And Cycle Time Efficient Warehouse Design For Autonomous Vehicle-Based Storage And Retrieval System, Banu Yetkin Ekren, Tone Lerher

14th IMHRC Proceedings (Karlsruhe, Germany – 2016)

This study explores the best warehouse design for an autonomous vehicle based storage and retrieval system (AVS/RS) minimizing average energy consumption per transaction and average cycle time per transaction, simultaneously. In the design concept, we consider, rack design in terms of number of bays, number of tiers, number of aisles; number of resources, namely number of autonomous vehicles and lifts and; velocity profiles of lifts and autonomous vehicles in the AVS/RS. We completed 1,296 number of experiments in simulation to obtain Pareto solutions representing the “average energy consumption per transaction” and “average cycle time per transaction” trade-offs based on designs …

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