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Operations and Supply Chain Management Commons™

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Singapore Management University

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Articles 331 - 360 of 409

Full-Text Articles in Operations and Supply Chain Management

Pricing And Inventory Control In Dual-Channel Network With One Manufacturer And Retailer, Zhicong Pan Jan 2010

Pricing And Inventory Control In Dual-Channel Network With One Manufacturer And Retailer, Zhicong Pan

Dissertations and Theses Collection (Open Access)

The study on multi-channel problems has been one of the most active research fields in recent years. In this paper, we consider a dual-channel network problem with one manufacture and one retailer. The manufacturer, acting as the Stackelberg leader, sells a single type of product through a traditional channel to the retailer and/or through a direct channel to customers. The retailer, acting as the follower, operates a Newsvendor model, ordering from the manufacturer and selling to the customers. We study the problem with the deterministic demand. We develop an efficient algorithm to find the joint optimal policy for three prices: …

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A Flexible Payment Scheme In Hotel Business, Ciwei Dong Jan 2010

A Flexible Payment Scheme In Hotel Business, Ciwei Dong

Dissertations and Theses Collection (Open Access)

This paper introduces a flexible payment scheme in the hotel business. When a customer makes a reservation for a hotel room, the hotel offers an optional payment scheme (Scheme O). If the customer chooses the Scheme O, he/she makes a non-refundable down payment immediately. Meanwhile, the hotel offers a discount if the customer actually checks in to the hotel. Thus, the payment at check-out time is much lower than the original rental rate. Alternatively, if the customer rejects the Scheme O, the reservation is made under a traditional Scheme (Scheme T), where no down payment is required. However, the customer …

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Risk Response Strategies In The Supply Chain: Examining Attributes Of Stakeholders And Risk Attitude, Shu Jian Lim Jan 2010

Risk Response Strategies In The Supply Chain: Examining Attributes Of Stakeholders And Risk Attitude, Shu Jian Lim

Dissertations and Theses Collection (Open Access)

Supply chain management is about managing flows of material, information and funds in a complex network of entities of suppliers, manufacturers, distributors and customers. Companies are now connected in this network as an extended enterprise and any company may be involved in more than one such extended enterprises. But, such a network of relationships is very much vulnerable to disruptions of all sorts ranging from internal to inter-firm and to external turbulences. Companies now need to be prepared for risks associated with their participation in the supply chain network. Not many works in the literature have used theories to study …

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Pricing And Lead Time Decisions In A Duopoly Common Retailer Channel, Xiuming Niu Jan 2010

Pricing And Lead Time Decisions In A Duopoly Common Retailer Channel, Xiuming Niu

Dissertations and Theses Collection (Open Access)

This thesis studies a dual-level decentralized supply chain consisting of two suppliers and two retailers facing a price- and lead-time-sensitive demand. We model the suppliers’ operations as M/M/1 queues and demand as a linear function of the retail prices and promised delivery lead-times offered to the customers. Three different kinds of games are constructed to analyze the pricing and lead-time decisions of the suppliers and retailers. We show the existence of a unique equilibrium in all games and provide the exact formulas to compute the optimal decisions for both the suppliers and retailers. We further present numerical examples to illustrate …

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Procure Financing For Shipping By Auctions, Kekun Wu Jan 2010

Procure Financing For Shipping By Auctions, Kekun Wu

Dissertations and Theses Collection (Open Access)

We study a risk management problem in the scenario of ship procurement. A shipping firm faces a certain financing pressure for the procurement of a new ship. On the other hand, the capacity of the ship excesses the demand requirement of the firm. The firm wants to reduce the payment and control the risk by selling a percentage of capacity to another shipping company. We introduce an auction mechanism for the firm to select the partner and determine the sharing percentage. Acting as the auctioneer, the firm announces a certain percentage of capacity to a set of buyers. The payment …

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Effective Project Planning: Making The Most Of Project Planning Tools, Bert De Reyck Jan 2010

Effective Project Planning: Making The Most Of Project Planning Tools, Bert De Reyck

Research Collection Lee Kong Chian School Of Business

Although project planning tools such as Microsoft Project and Primavera have become indispensable tools for supporting the project planning process in a wide variety of industries and organizations, many companies do not use these tools in the best possible way, resulting in disappointment and frustration as well as a lack of effective project management support. In this article, we propose several guidelines on what to do,

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Nested Coloured Timed Petri Nets For Production Configuration Of Product Families, Lianfeng Zhang, Brian Rodrigues Jan 2010

Nested Coloured Timed Petri Nets For Production Configuration Of Product Families, Lianfeng Zhang, Brian Rodrigues

Research Collection Lee Kong Chian School Of Business

Production configuration is as an effective technique to deal with product variety while maintaining production stability and efficiency. It involves a diverse set of process elements (e.g., machines, operations), a high variety of component parts and assemblies and many constraints arising from product and process variety. Production configuration entails the selection and subsequent arrangement of process elements into complete production processes and the final evaluation of configured multiple alternatives. To better understand production configuration and its implementation, we study the underlying logic for configuring production processes using a dynamic modelling and visualisation approach. This is accomplished by developing a new …

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Managing Supply Uncertainty With An Information Market, Zhiling Guo, Fang Fang, Andrew B. Whinston Dec 2009

Managing Supply Uncertainty With An Information Market, Zhiling Guo, Fang Fang, Andrew B. Whinston

Research Collection School Of Computing and Information Systems

We propose a market-based information aggregation mechanism to manage the supply side uncertainty in the supply chain. In our analytical model, a simple supply chain consists of a group of retailers who order a homogeneous product from two suppliers. The two suppliers differ in their ability to fulfill orders – one always delivers orders and the other fulfills orders probabilistically. We model the supply chain decisions as a Stackelberg game where the supplier who has uncertain reliability decides a wholesale price before the retailers who independently receive signals about the supplier’s reliability determine their sourcing strategies. We then propose an …

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How To Optimize Knowledge Sharing In A Factory Network, Arnoud De Meyer, Ann Vereecke Sep 2009

How To Optimize Knowledge Sharing In A Factory Network, Arnoud De Meyer, Ann Vereecke

Research Collection Lee Kong Chian School Of Business

Designing a manufacturing network entails devising and managing flows of innovation and know-how—not just determining what to produce and where—and organizing the resulting logistics flows.

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Deterministic Chaos In A Model Of Discrete Manufacturing, John J. Iii Bartholdi, Donald D. Eisenstein, Yun Fong Lim Jun 2009

Deterministic Chaos In A Model Of Discrete Manufacturing, John J. Iii Bartholdi, Donald D. Eisenstein, Yun Fong Lim

Research Collection Lee Kong Chian School Of Business

A natural extension of the bucket brigade model of manufacturing is capable of chaotic behavior in which the product intercompletion times are, in effect, random, even though the model is completely deterministic. This is, we believe, the first proven instance of chaos in discrete manufacturing. Chaotic behavior represents a new challenge to the traditional tools of engineering management to reduce variability in production lines. Fortunately, if configured correctly, a bucket brigade assembly line can avoid such pathologies.

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Modelling Reconfigurable Manufacturing Systems With Coloured Timed Petri Nets, Lianfeng Zhang, Brian Rodrigues Jun 2009

Modelling Reconfigurable Manufacturing Systems With Coloured Timed Petri Nets, Lianfeng Zhang, Brian Rodrigues

Research Collection Lee Kong Chian School Of Business

Reconfigurable manufacturing systems (RMSs) have been acknowledged as a promising means of providing manufacturing companies with the required production capacities and capabilities. This is accomplished through reconfiguring system elements over time for a diverse set of individualised products often required in small quantities and with short delivery lead times. Recognising the importance of dynamic modelling and visualisation in decision-making support in RMSs and the limitations of current research, we propose in this paper to model RMSs with Petri net (PN) techniques with focus on the process of reconfiguring system elements while considering constraints and system performance. In view of the …

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Towards A Single European Sky, Yael Gruksha-Cockayne, Bert De Reyck Jun 2009

Towards A Single European Sky, Yael Gruksha-Cockayne, Bert De Reyck

Research Collection Lee Kong Chian School Of Business

We describe an integrated decision-making framework and model that we developed to aid EUROCONTROL, the European air traffic management organization, in its vital role of constructing a single unified European sky. Combining multicriteria decision analysis with large-scale optimization methods, such as integer programming and column generation using branch and price, our model facilitates the process by which the numerous European aviation stakeholders evaluate and select technological enhancements to the European air traffic management system. We consider multiple objectives and potential disagreements by stakeholders regarding the impact of proposed system enhancements and allow for different priorities for each key performance area. …

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Information Sharing And Strategic Signaling In Supply Chains, Robert J. Kauffman, Hamid Mohtadi Jun 2009

Information Sharing And Strategic Signaling In Supply Chains, Robert J. Kauffman, Hamid Mohtadi

Research Collection School Of Computing and Information Systems

Information sharing in procurement occurs in rich and varied industry contexts in which managerial decisions are made and organizational strategy is formulated. We explore how information sharing ought to work in procurement contexts that involve investments in inter-organizational information systems (IOS) and collaborative planning, forecasting and replenishment (CPFR) practices. How and under what circumstances does a firm that plays the role of a supply chain buyer decide to share information on key variables, such as point-of-sale consumer demand data with its supplier, up the supply chain? This is a key issue that crosses the boundary between supply chain management and …

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A Metaheuristic For The Pickup And Delivery Problem With Split-Loads And Its Extension, Dai Yao Jan 2009

A Metaheuristic For The Pickup And Delivery Problem With Split-Loads And Its Extension, Dai Yao

Dissertations and Theses Collection (Open Access)

In this dissertation, we study improvements in the Pickup and Delivery Problem that can be achieved by allowing multiple vehicle trips to serve a common load. We explore how costs can be reduced through the elimination of the constraint that a load must be served by only one vehicle trip. Specifically, we investigate the problem of routing vehicles to serve loads that have distinct origins and destinations, with no constraint on the amount of a load that a vehicle may serve at a time. We develop a metaheuristic to solve large scale practical size problems in this form and apply …

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Maximizing Throughput Of Bucket Brigades On Discrete Work Stations, Yun Fong Lim, Kum Khiong Yang Jan 2009

Maximizing Throughput Of Bucket Brigades On Discrete Work Stations, Yun Fong Lim, Kum Khiong Yang

Research Collection Lee Kong Chian School Of Business

One way to coordinate workers along an assembly line that has fewer workers than work stations is to form a bucket brigade. The throughput of a bucket brigade on discrete work stations may be compromised due to blocking even if workers are sequenced from slowest to fastest. For a given work distribution on the stations we find policies that maximize the throughput of the line. When workers have very different production rates, fully cross-training the workers and sequencing them from slowest to fastest is almost always the best policy. This policy outperforms other policies for most work distributions except for …

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A Petri Net-Based Approach To Reconfigurable Manufacturing Systems Modeling, Linda L. Zhang, Brian Rodrigues Jan 2009

A Petri Net-Based Approach To Reconfigurable Manufacturing Systems Modeling, Linda L. Zhang, Brian Rodrigues

Research Collection Lee Kong Chian School Of Business

Reconfigurable manufacturing systems (RMSs) have been used to provide manufacturing companies with the required capacities and capabilities, when needed. Recognizing (1) the importance of dynamic modeling and visualization in decision making support in RMSs and (2) the limitations of the existing studies, we model RMSs based on Petri net (PN) techniques with focus on the process of reconfiguring system elements while considering constraints and system performance. In response to the modeling difficulties identified, a new formalism of colored timed PNs is introduced. In conjunction with colored tokens and timing in colored PNs and timed PNs, we further define a reconfiguration …

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Milestone Payments Or Royalties? Contract Design For R&D Licensing, Pascale Crama, Bert De Reyck, Zeger Degraeve Nov 2008

Milestone Payments Or Royalties? Contract Design For R&D Licensing, Pascale Crama, Bert De Reyck, Zeger Degraeve

Research Collection Lee Kong Chian School Of Business

We study how innovators can optimally design licensing contracts when there is incomplete information on the licensee's valuation of the innovation, and limited control over the licensee's development efforts. A licensing contract typically contains an up-front payment, milestone payments at successful completion of a project phase, and royalties on sales. We use principal-agent models to formulate the licensor's contracting problem, and we find that under adverse selection, the optimal contract structure changes with the licensee's valuation of the innovation. As the licensee's valuation increases, the licensor's optimal level of involvement in the development-directly or through royalties-should decrease. Only a risk-averse …

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Dynamic Allocation Of Airline Check-In Counters: A Queueing Optimisation Approach, Mahmut Parlar, Sharafali Moosa Aug 2008

Dynamic Allocation Of Airline Check-In Counters: A Queueing Optimisation Approach, Mahmut Parlar, Sharafali Moosa

Research Collection Lee Kong Chian School Of Business

This paper was motivated by an observation in an international airport with regard to allocation of resources for check-in counters. In an exclusive check-in counter system, each flight has a dedicated number of counters that will be open until at least a half-hour before the scheduled departure of that flight. Currently, in many of the airports around the world, the decision to open or close check-in counters is done on an ad hoc basis by human schedulers. In doing so, the schedulers are almost always forced to perform a balancing act in meeting the quality of service stipulated by the …

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An Integrated Decision– Making Approach For Improving European Air Traffic Management, Yael Gruksha-Cockayne, Bert De Reyck, Zeger Degraeve Aug 2008

An Integrated Decision– Making Approach For Improving European Air Traffic Management, Yael Gruksha-Cockayne, Bert De Reyck, Zeger Degraeve

Research Collection Lee Kong Chian School Of Business

We develop a multistakeholder, multicriteria decision-making framework for Eurocontrol, the European air traffic management organization, for evaluating and selecting operational improvements to the air traffic management system. The selected set of improvements will form the master plan of the Single European Sky initiative for harmonizing air traffic, in an effort to cope with the forecasted increase in air traffic, while maintaining safety, protecting the environment, and improving predictability and efficiency. The challenge is to select the set of enhancements such that the required performance targets are met and all key stakeholders are committed to the decisions. In this paper, we …

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Multi-Echelon Repairable Item Inventory System With Limited Repair Capacity Under Nonstationary Demands, Hoong Chuin Lau, Huawei Song Jan 2008

Multi-Echelon Repairable Item Inventory System With Limited Repair Capacity Under Nonstationary Demands, Hoong Chuin Lau, Huawei Song

Research Collection School Of Computing and Information Systems

Classical multi-echelon repairable item inventory models are based either on steady-state analysis or infinite repair capacity, which may not work well in situations when the demand is nonstationary, or repair capacity is limited. In this paper, we propose an analytical model for evaluating system performance that works well under limited repair capacity and nonstationary demands. Following the METRIC methodology, we then develop an optimisation algorithm to solve the corrective maintenance problem in military logistics. Experimental results show that our approach yields good solutions efficiently. This work has also resulted in a software that has been field-tested by a military organisation.

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Research And Development Project Valuation And Licensing Negotiations At Phytopharm Plc, Pascale Crama, Bert De Reyck, Zeger Degraeve, Wang Chong Oct 2007

Research And Development Project Valuation And Licensing Negotiations At Phytopharm Plc, Pascale Crama, Bert De Reyck, Zeger Degraeve, Wang Chong

Research Collection Lee Kong Chian School Of Business

We describe a research and development project-valuation model developed for Phytopharm plc, a pharmaceutical development and functional food company based in Cambridgeshire, United Kingdom. Phytopharm uses the model to value the projects in its research and development portfolio, and in licensing negotiations with potential product development and marketing partners. We include different valuation methods, including net present value, decision analysis, and Monte Carlo simulation. We also consider the technological risks of product development, as well as the uncertainty of commercial success. In addition to determining a value for a product in development, the model proposes appropriate licensing contract structures. A …

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Chaos And Convergence On Bucket Brigade Assembly Lines, John J. Bartholdi, Iii, Donald D. Eisenstein, Yun Fong Lim Jun 2007

Chaos And Convergence On Bucket Brigade Assembly Lines, John J. Bartholdi, Iii, Donald D. Eisenstein, Yun Fong Lim

Research Collection Lee Kong Chian School Of Business

One way to coordinate the efforts of workers along an assembly line that has fewer workers than work stations is to form a bucket brigade. Each worker in a bucket brigade simultaneously assembles a single item (an instance of the product) along the line. The worker carries the item from work station to work station until either he hands of his item to a downstream co-worker or he completes the work for his item. The worker then walks back to get another item, either from his co-worker upstream or from a buffer at the beginning of the line. The most …

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Machine Scheduling Performance With Maintenance And Failure, Yunsong Guo, Andrew Lim, Brian Rodrigues, Shuang Yu May 2007

Machine Scheduling Performance With Maintenance And Failure, Yunsong Guo, Andrew Lim, Brian Rodrigues, Shuang Yu

Research Collection Lee Kong Chian School Of Business

In manufacturing control, machine scheduling research has mostly dealt with problems either without maintenance or with deterministic maintenance when no failure can occur. This can be unrealistic in practical settings. In this work, an experimental model is developed to evaluate the effect of corrective and preventive maintenance schemes on scheduling performance in the presence of machine failure where the scheduling objective is to minimize schedule duration. We show that neither scheme is clearly superior, but that the applicability of each depends on several system parameters as well as the scheduling environment itself. Further, we show that parameter values can be …

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A Comparison Of Cross Training Policies In Different Job Shops, Kum Khiong Yang Mar 2007

A Comparison Of Cross Training Policies In Different Job Shops, Kum Khiong Yang

Research Collection Lee Kong Chian School Of Business

This research compares a set of cross-training policies represented by different numbers of cross-trained workers, additional skills per cross-trained worker, and additional machines. The policies are evaluated in job shops, represented by different efficiency losses, labour utilization, variability in processing times, and worker absenteeism. Our results show that adding one machine in each department and cross-training one or two workers from each department with one additional skill is generally sufficient to realize most of the benefits of cross-training. Cross-training is thus beneficial in most job shops, unless the cost of the minimal training and spare machines is high. Our results …

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Logistics Network Design With Supplier Consolidation Hubs And Multiple Shipment Options, Michelle L. F. Cheong, Rohit Bhatnagar, Stephen C. Graves Feb 2007

Logistics Network Design With Supplier Consolidation Hubs And Multiple Shipment Options, Michelle L. F. Cheong, Rohit Bhatnagar, Stephen C. Graves

Research Collection School Of Computing and Information Systems

An important service provided by third-party logistics (3PL) firms is to manage the inbound logistics of raw materials and components from multiple suppliers to several manufacturing plants. A key challenge for these 3PL firms is to determine how to coordinate and consolidate the transportation flow, so as to get the best overall logistics performance. One tactic is to establish consolidation hubs that collect shipments from several suppliers, consolidate these shipments, and direct the consolidated shipments to the appropriate manufacturing plant. We consider the network design problem to implement this tactic, namely deciding the number, location and operation of consolidation hubs …

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Real-Time Supply Chain Control Via Multi-Agent Adjustable Autonomy, Hoong Chuin Lau, Lucas Agussurja, Ramesh Thangarajoo Jan 2007

Real-Time Supply Chain Control Via Multi-Agent Adjustable Autonomy, Hoong Chuin Lau, Lucas Agussurja, Ramesh Thangarajoo

Research Collection School Of Computing and Information Systems

Real-time supply chain management in a rapidly changing environment requires reactive and dynamic collaboration among participating entities. In this work, we model supply chain as a multi-agent system where agents are subject to an adjustable autonomy. The autonomy of an agent refers to its capability to make and influence decisions within a multi-agent system. Adjustable autonomy means changing the autonomy of the agents during runtime as a response to changes in the environment. In the context of a supply chain, different entities will have different autonomy levels and objective functions as the environment changes, and the goal is to design …

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A Framework For Supplier Relationship Management (Srm), Sabine Moeller, Martin Fassnacht, Sonja Klose Dec 2006

A Framework For Supplier Relationship Management (Srm), Sabine Moeller, Martin Fassnacht, Sonja Klose

Research Collection Lee Kong Chian School Of Business

We perceive growing expectations concerning the impact of the purchasing function and the suppliers on overall value creation of a firm. Purchasing is the gateway between the external suppliers and the internal functions creating and delivering value for customers. This shift has incredibly enhanced the importance of the supplier base. While the old arm length collaboration is perfectly suitable for some suppliers others should be treated as close partners. However, an overall framework of Supplier Relationship Management (SRM) integrating such different types of suppliers along the course of the relationship remains desirable. Our research aims to contribute by developing a …

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A Typology Of Plants In Global Manufacturing Networks, Ann Vereecke, Roland Van Dierdonck, Arnoud De Meyer Nov 2006

A Typology Of Plants In Global Manufacturing Networks, Ann Vereecke, Roland Van Dierdonck, Arnoud De Meyer

Research Collection Lee Kong Chian School Of Business

The purpose of this paper is to propose a new, empirically derived typology of plants in the international manufacturing network of multinational companies. This typology is based on the knowledge flows between the plants. In our research, network analysis has been used as a methodology for understanding the position of plants in international manufacturing networks. The focus has been primarily on the intangible knowledge network, and secondarily on the physical, logistic network. Our analysis leads to four types of plants with different network roles: the isolated plants, the receivers, the hosting network players, and the active network players. Our analysis …

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Optimal Order Quantities With Remanufacturing Across New Product Generations, Shantanu Bhattacharya, V Daniel R. Guide, Luk N. Van Wassenhove Sep 2006

Optimal Order Quantities With Remanufacturing Across New Product Generations, Shantanu Bhattacharya, V Daniel R. Guide, Luk N. Van Wassenhove

Research Collection Lee Kong Chian School Of Business

We address the problem of determining the optimal retailer order quantities from a manufacturer who makes new products in conjunction with ordering remanufactured products from a remanufacturer using used and unsold products from the previous product generation. Specifically, we determine the optimal order quantity by the retailer for four systems of decision-making: (a) the three firms make their decisions in a coordinated fashion, (b) the retailer acts independently while the manufacturer and remanufacturer coordinate their decisions, (c) the remanufacturer acts independently while the retailer and manufacturer coordinate their decisions, and (d) all three firms act independently. We model the four …

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The Role Of European Governments In The Digital Economy, Arnoud Cyriel Leo De Meyer Jan 2006

The Role Of European Governments In The Digital Economy, Arnoud Cyriel Leo De Meyer

Research Collection Lee Kong Chian School Of Business

What is the role of government in the digital economy? It is not our intention to go into an in-depth ideological debate on whether governments should intervene in the business sector. We will try to adopt a pragmatic approach and explore what already happens in practice. It is up to the reader to make a judgment to what extent the governments should be involved in the ICT sector. There is enough indication that, due to network externality effects, governments need to take on an active role in stimulating an e-environment to jump-start the move toward a higher level of e-readiness.In …

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