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Articles 1 - 30 of 31
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A Real-Time Picking And Sorting System In E-Commerce Distribution Centers, Yeming Gong, Erik M. M. Winands, Rene B. M. De Koster
A Real-Time Picking And Sorting System In E-Commerce Distribution Centers, Yeming Gong, Erik M. M. Winands, Rene B. M. De Koster
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Order fulfillment is the most expensive and critical operation for companies engaged in e-commerce. E-commerce distribution centers must rapidly organize the picking and sorting processes during and after the transaction has taken place, with the ongoing need to create greater responsiveness to customers. Sorting brings a relatively large setup time, which cannot be well admitted by existing polling models. We build a new stochastic polling model to describe and analyze such systems, and provide approximate explicit expressions for the complete distribution of order line waiting time for polling-based order picking systems and test their accuracy. These expressions lend themselves for …
Dispatching Vehicles Considering Uncertain Handling Times At Port Container Terminals, Vu Duc Nguyen, Kap Hwan Kim
Dispatching Vehicles Considering Uncertain Handling Times At Port Container Terminals, Vu Duc Nguyen, Kap Hwan Kim
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
This paper considers the problem of vehicle dispatching at port container terminals in a dynamic environment. The problem deals with the assignment of delivery orders of containers to vehicles while taking into consideration the uncertainty in the travel times of the vehicles. Thus, a real-time vehicle dispatching algorithm is proposed for adaptation to the dynamic changes in the states of the container terminals. To evaluate the performance of the proposed algorithm, a simulation study was conducted by considering various values of decision parameters under the uncertainty in travel times. Further, the performance of the proposed algorithm was compared with those …
The Effect Of Interaction Between The Production System (Ps) And A Looped Conveyor-Based Material Handling System (Lcmhs) In A Manufacturing Facility, Vernet Lasrado, Dima Nazzal
The Effect Of Interaction Between The Production System (Ps) And A Looped Conveyor-Based Material Handling System (Lcmhs) In A Manufacturing Facility, Vernet Lasrado, Dima Nazzal
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
In this paper, we provide empirical evidence that shows the effect of the interaction between the production system (PS) and a looped conveyor-based material handling system (LCMHS) in a manufacturing facility. A rudimentary simulation model captures the interaction between the two systems. Varying several key factors, we test for a statistically significant difference in the work in process (WIP) of the production system with and without the LCMHS to find if the squared coefficient of variation (SCV) of the interarrival time distribution to the PS is affected. The results suggest the need to model the interaction between the two systems …
The Future Of Modeling In Material Handling Systems, Leon F. Mcginnis
The Future Of Modeling In Material Handling Systems, Leon F. Mcginnis
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Today, when we talk about “modeling” in the context of material handling systems, invariably we are referring to a mathematical or computational model for analyzing some aspect of the system, such as its throughput rate, response time, cost of ownership, required storage capacity, etc. Creating these kinds of models requires considerable knowledge in at least two domains the material handling system domain, and the analysis methodology domain—and considerable skill in the “art of modeling” in order to express the former in the terms of the latter. The results can be somewhat ad hoc—e.g., two different modelers are likely to create …
A Flowshop Scheduling Problem With Transportation Times And Capacity Constraints, Abraham Mendoza, Jose A. Ventura, Kwei Long Huang
A Flowshop Scheduling Problem With Transportation Times And Capacity Constraints, Abraham Mendoza, Jose A. Ventura, Kwei Long Huang
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Although there are numerous methodologies and research studies on machine scheduling, most of the literature assumes that there is an unlimited number of transporters to deliver jobs from one machine to another for further processing and that transportation times can be neglected. These two assumptions are not applicable if one intends to generate an accurate schedule for the shop floor. In this research, a flowshop scheduling problem with two machines, denoted as M1 and M2, and a single transporter with capacity c is considered. The main focus is on the development of a dynamic programming algorithm to generate a schedule …
Using Data Envelopment Analysis To Evaluate The Performance Of Third Party Distribution Centers, Ching-Jung Ting, Hsueh-Lin Fang
Using Data Envelopment Analysis To Evaluate The Performance Of Third Party Distribution Centers, Ching-Jung Ting, Hsueh-Lin Fang
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
There has been considerable interest worldwide in last few years in the growth of third party logistics (3PL) providers. 3PL distribution center (DC) enables firms to achieve reduced operating costs, increased revenues, and to focus on their core competence. This research aims to find the key performance indicators through a survey of a set of DCs and then evaluate their efficiency over the period 2005-2007 using data envelopment analysis (DEA) models based on selected performance indicators as inputs and outputs. Three inputs and two outputs for all DCs from the surveyed performance indicators were selected in this study. DEA is …
Class-Based Storage With A Finite Number Of Items, Yugang Yu, René B.M. De Koster
Class-Based Storage With A Finite Number Of Items, Yugang Yu, René B.M. De Koster
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
ABC class-based storage is widely studied in literature and applied practice. It divides all stored items into a limited number of classes according to their demand rates (turnover per unit time). Classes of items with higher turnovers are stored in a region closer to the warehouse depot. In literature, it is commonly shown that the use of more storage classes leads to shorter travel time for storing and retrieving items. A basic assumption in this literature commonly is that the required storage space of items equals their average inventory levels, which is right if an infinite number of items are …
Blocking Effects On Performance Of Warehouse Systems With Automonous Vehicles, Ananth Krishnamurthy, Sunderesh Heragu, Charles Malmborg
Blocking Effects On Performance Of Warehouse Systems With Automonous Vehicles, Ananth Krishnamurthy, Sunderesh Heragu, Charles Malmborg
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Distribution centers are under increasing pressure to adopt material handling systems that offer greater flexibility to improve cycle time and throughput capacity in the transfer of unit loads in their high density storage areas. Autonomous Vehicles-based Storage and Retrieval Systems (AVS/RS), have been shown to hold significant promise in this context. In these systems, loads are transferred by autonomous vehicles. Vehicles support horizontal load movement along aisles and cross-aisles within a tier, and lifts support vertical movement between tiers. Existing research in AVS/RS, do not explicitly account for the potential blocking of vehicles and lifts while they are processing transactions. …
Freight Sequencing To Improve Hub Operations In The Less-Than-Truckload Freight Transportation Industry, Xiangshang Tong, Kimberly Ellis, Amy Brown Greer
Freight Sequencing To Improve Hub Operations In The Less-Than-Truckload Freight Transportation Industry, Xiangshang Tong, Kimberly Ellis, Amy Brown Greer
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
In less-than-truckload freight transportation, hub operations affect the service levels that carriers are able to provide their customers. This paper focuses on improving the efficiency of hub operations by reducing freight handling time and cost. Specifically, the freight sequencing problem (FSP) is investigated to determine the freight unloading and loading sequence that minimizes the time for dock workers to transfer shipments from origin trailers to destination trailers. The FSP is modeled as a Rural Postman Problem (RPP) and three algorithms are compared: trailer-at-atime, nearest neighbor, and balance-and-connect. Using five industrial data sets, the results demonstrate the effectiveness, advantages, and disadvantages …
Spiral Facility Layout Generation And Improvement Algorithm, Hatice E. Sanli, Fahrettin Eldemir
Spiral Facility Layout Generation And Improvement Algorithm, Hatice E. Sanli, Fahrettin Eldemir
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
This study is concerned with construction and improvement of a facility layout heuristic called Spiral Facility Layout Generation and Improvement Algorithm (SFLA). The algorithm starts with positioning departments from center point and continues like a hologram from center to outside. The aim of any facility layout algorithm is to better allocate the departments within facility. SFLA is compared with the existing space filling curve methods, MCRAFT and MULTIPLE, that are available in the literature. To form an initial spiral curve, a block system is used, like the bands for MCRAFT. The width and length of the blocks are given by …
Designing Automated Warehouses By Minimising Investment Cost Using Genetic Algorithms, Tone Lerher, Iztok Potrc, Matjaz Sraml
Designing Automated Warehouses By Minimising Investment Cost Using Genetic Algorithms, Tone Lerher, Iztok Potrc, Matjaz Sraml
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
The successful performance of the automated storage and retrieval systems is dependent upon the appropriate design and optimization process. In the present work a comprehensive model of designing automated storage and retrieval system for the single- and multi-aisle systems is presented. Because of the required conditions that the automated storage and retrieval systems should be technically highly efficient and that it should be designed on reasonable expenses, the objective function represents minimum total cost. The objective function combines elements of layout, time-dependent part, the initial investment and the operational costs. Due to the nonlinear, multi-variable and discrete shape of the …
Distribution Planning Considering Warehousing Decisions, Pratik J. Parikh, Xinhui Zhang, Bhanuteja Sainathuni
Distribution Planning Considering Warehousing Decisions, Pratik J. Parikh, Xinhui Zhang, Bhanuteja Sainathuni
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Modern supply chains heavily depend on warehouses for rapidly fulfilling customer demands through retail, web-based, and catalogue channels. The traditional approach that considers warehouses as cost-centers has affected the profitability of numerous supply chains. A lack of synchronization between procurement and allocation decisions causes warehouses to scramble for resources during peak times and be faced with under-utilized resources during drought times. Warehouses, however, have emerged as service-centers and it is imperative that warehousing decisions be an integral part of supply chain decisions. In this paper we propose a mixed-integer programming model to integrate warehousing decisions with those of inventory and …
Optimizing Distribution Center Configuration: A Practical View Of A Multi-Objective Problem, Russell D. Meller, Lisa M. Thomas
Optimizing Distribution Center Configuration: A Practical View Of A Multi-Objective Problem, Russell D. Meller, Lisa M. Thomas
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
The shape of a distribution center, as well as whether dock locations are on one side or two sides of the facility, impacts measures like travel distances and the number of dock locations that may be utilized. Thus, for a required number of pallet locations, there are multiple combinations of distribution center shape and dock configurations that should be evaluated against multiple measures. We have developed a practical model for making such evaluations and illustrate the model with data reflective of a partner in the Center for Engineering Logistics and Distribution.
Empirically-Based Warehouse Design: Can Academics Accept Such An Approach?, James M. Apple Jr., Russell D. Meller, John A. White Jr.
Empirically-Based Warehouse Design: Can Academics Accept Such An Approach?, James M. Apple Jr., Russell D. Meller, John A. White Jr.
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
It is our opinion that existing research is not sufficient to support the design of a warehouse. As a result, facility designers that work in practice are left to face the design process with their own methods. These methods are in stark contrast to the analytical models developed in academia in that they are highly based on empirical observations. Supported by a collection of empirical observations, facility designers who work in practice employ an ad hoc design process. We present a design process based on empirical observations and then formalize it so that it can be taught and used. We …
Growth In Russia's Federal Districts, 1994-2003, Gregory J. Brock
Growth In Russia's Federal Districts, 1994-2003, Gregory J. Brock
Finance and Economics Faculty Publications
Russian macroeconomic growth in the transition era is analysed across federal districts using a neoclassical production function often found in studies of Soviet-era economic growth. An adjusted capital stock series for Russian regions is created and used in the aggregate production function for 1995–2003 to analyse growth across the 11 federal districts in Russia. Federal district output growth is found to be explained well by neoclassical growth theory, indicating that poorer regions may converge to richer regions, thereby strengthening the Russian Federation. Federal districts also have high capital/labour ratios, suggesting that expanded regional domestic and foreign investment across Russia in …
Optimizing The Rearrangement Process In A Dedicated Warehouse, Hector J. Carlo, German E. Giraldo
Optimizing The Rearrangement Process In A Dedicated Warehouse, Hector J. Carlo, German E. Giraldo
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Determining the optimal storage assignment for products in a dedicated warehouse has been addressed extensively in the Facility Logistics literature. However, the process of implementing a particular storage assignment given the current location of products has not received much attention in the existing literature. Typically, warehouses use downtime or overtime to remove products from their current location and move them to the suggested location. This work presents the Rearrange-While-Working (RWW) policy to optimize the process of rearranging a dedicated warehouse. The RWW policy seeks to relocate products in a warehouse from the initial arrangement to the optimal arrangement while serving …
The Human-Centric Warehouse, Kevin R. Gue
The Human-Centric Warehouse, Kevin R. Gue
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
In theory and in practice, the objective of warehouse design has long been to meet operational requirements of throughput and service performance at minimum cost. A natural product of this “bottom line” approach has been warehouse buildings and operations ill-suited to the humans who spend their working lives interacting with them. We offer an explanation for the current approach, and argue that a new approach— a new paradigm —is needed. We then describe a comprehensive approach to warehouse design that includes human well-being as a primary goal.
Demand Versus Supply: Assessing The Capacity Of Mpa Programs To Satisfy The Growing Need For Professional Management In Local Government, Gerald T. Gabris, Trenton J. Davis, Kimberly L. Nelson
Demand Versus Supply: Assessing The Capacity Of Mpa Programs To Satisfy The Growing Need For Professional Management In Local Government, Gerald T. Gabris, Trenton J. Davis, Kimberly L. Nelson
Department of Public & Nonprofit Studies Faculty Publications
This article addresses concerns expressed by members of the International City/ County Management Association (ICMA) regarding whether the supply of qualified local government managers will keep pace with the future demand for this occupation. The authors developed several important observations, which are based on decades of experience with a Master of Public Administration (MPA) program focused on local government management, plus strategic planning experience in over 100 local governments. First, it is likely that the impending retirement of the Baby Boom generation of city managers will cause some supply shortages of professional managers in specific geographical regions of the country. …
Forklift Routing In Warehouses Using Dual-Commands And Stackable Pallets, Ahmed Hassan, Bill Ferrell
Forklift Routing In Warehouses Using Dual-Commands And Stackable Pallets, Ahmed Hassan, Bill Ferrell
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
This research determines time optimal routes for loading and picking pallets that can be stacked on top of each other during transport in a manual warehouse that only contains full pallets and utilizes single deep storage. This research was motivated by the fact that we are seeing this situation on an ever increasing basis, particularly in warehouses that supply parts to automotive assembly. In practice, forklift drivers have developed strategies to take advantage of this opportunity but to our knowledge there is no literature that addresses this problem rigorously. The important features of this work are that a time based …
A New Milp Approach For The Facility Layout Design Problem With Rectangular And L/T Shaped Departments, Yossi Bukchin, Michal Tzur
A New Milp Approach For The Facility Layout Design Problem With Rectangular And L/T Shaped Departments, Yossi Bukchin, Michal Tzur
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
In this paper we propose a new approach for the facility layout problem (FLP) and suggest new mixed-integer linear programming (MILP) formulations. The proposed approach considers simultaneously the location of the departments within the facility and the internal arrangement of the machines. Two models are suggested, where the first addresses the rectangular department case and the second allows nonrectangular departments defined by an L/T shape. New regularity constraints are developed to avoid irregular department shapes.
Evaluating The Effect Of Operational Conditions And Practices On Warehouse Performance, Andrew L. Johnson
Evaluating The Effect Of Operational Conditions And Practices On Warehouse Performance, Andrew L. Johnson
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Analyzing warehouse performance across different environments is critical to improving overall productivity and reducing costs. Although two-stage DEA estimators have been shown to be statistically consistent, the finite sample bias of DEA in the first stage carries over to the secondstage regression, which causes bias in the estimated coefficients of the contextual variables. The bias is particularly severe when the contextual variables are correlated with inputs. To address this shortcoming, we apply insights from Johnson and Kuosmanen (2010), who demonstrate that DEA can be formulated as a constrained special case of the Convex Nonparametric Least Squares (CNLS) regression to develop …
Accidents Will Happen. Do Safety Systems Improve Warehouse Safety Performance?, Rene B. M. De Koster, B. M. Balk, I Davelaar, M. Martens
Accidents Will Happen. Do Safety Systems Improve Warehouse Safety Performance?, Rene B. M. De Koster, B. M. Balk, I Davelaar, M. Martens
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Safety is becoming more and more an issue in warehouses. In the literature, effective measures leading to increased occupational health and safety have hardly been researched. Most research focuses on the impact of perceived safety-related leadership of managers and worker safety consciousness on ‘safety climate’ and workers’ safe behavior. We have carried out exploratory research into which measures really improve the safety performance of a warehouse. We particularly focus on the effects of (1) safety-related work procedures, (2) safety leadership, and (3) workers’ safety consciousness. Based on a survey we show that safety leadership and safety-related work procedures significantly drive …
Control Policies For A Dynamic Storage System With Multiple Lifts And Shuttles, Iris F.A. Vis, Hector J. Carlo, Paloma Diaz, Maria E. Laboy, Bruno Vanwijgaarden
Control Policies For A Dynamic Storage System With Multiple Lifts And Shuttles, Iris F.A. Vis, Hector J. Carlo, Paloma Diaz, Maria E. Laboy, Bruno Vanwijgaarden
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
New types of Automated Storage and Retrieval Systems, able to achieve high throughput levels, are continuously being developed and require new control polices to take full advantage of the developed system. In this paper we study a dynamic storage system as developed by Vanderlande Industries consisting of a conveyor, two lifts, multiple transfer shuttles, and a storage rack. One of the decision problems for this system is the scheduling problem of the two lifts. In other words, which lift is going to handle which request and in which order. In this paper, we derive an integrated look-ahead heuristic based on …
Retiring Workers Could Present A Problem For Marketers, Even In A Recession, Eileen D. Weisenbach Keller, Doris M. Shaw
Retiring Workers Could Present A Problem For Marketers, Even In A Recession, Eileen D. Weisenbach Keller, Doris M. Shaw
Association of Marketing Theory and Practice Proceedings 2010
Today's workforce is aging fast. The tacit knowledge held by those approaching retirement is necessary for firms to compete in the increasingly competitive marketplace. While some research has been devoted to how older workers view their retirement will impact the workplace, minimal attention has been given to how younger workers view this issue. As companies strive to remain market-driven, this paper examines how younger personnel view the impact of retirement on their employers and the impending brain drain. A discussion of implications for the marketing function within firms also is provided.
Implications Of Contemporary Leadership Models On Sales Management, Ellen M. Raineri
Implications Of Contemporary Leadership Models On Sales Management, Ellen M. Raineri
Association of Marketing Theory and Practice Proceedings 2010
As organizations have discovered that they cannot solely compete on price, product, quality, or technology, organizations have sought the use of optimum leadership models to assist with competition and survival. After examining the evolution of three contemporary leadership models: Spiritual Leadership, Primal Leadership, and Innovative Leadership, it is shown that these models offer sustenance in various ways for organizations and employees. Furthermore, because of the introduction and practice of Spiritual Leadership, Primal Leadership, and Innovative Leadership, specific implications exist for sales management as related to their sales reps and to their customers.
At The Intersection Of Politics & Consumption: A Review Of Ethical Shopping In America, Julie M. Pharr
At The Intersection Of Politics & Consumption: A Review Of Ethical Shopping In America, Julie M. Pharr
Association of Marketing Theory and Practice Proceedings 2010
This paper condenses the existing literature on ethical shopping in the United States with the goal of providing an up-to-date review of the topic. It profiles the ethical shopper and distinguishes the various institutions and instruments of political consumerism evident in the Fair Trade movement. It also provides recommendations for more rigorous study of moral consumer behavior and implications for implementing fair trade marketing strategies.
A Tale Of Two Worlds: A Second Life For Higher Education?, Daniel Demaiolo, Donna Walsh
A Tale Of Two Worlds: A Second Life For Higher Education?, Daniel Demaiolo, Donna Walsh
Association of Marketing Theory and Practice Proceedings 2010
This exploratory research investigates the virtual world industry, explanations for its growth and emerging trends for entrepreneurial ventures and marketing communications. It then explores the effectiveness of operating and promoting higher education in Second Life. Results illustrate consumers 17-24 years old still rely on traditional media for information related to higher education. Developing a business model and marketing mix in Second Life, that often features uncensored content, may not be an appropriate method of connecting with the target demographic. Benefits of utilizing virtual worlds are considered; further research is recommended; suggestions are offered to increase Second Life’s viability in higher …
Utilizing The Innovative Leadership Behavior Inventory And Relationship Marketing As Critical Elements For Teaching/Learning Entrepreneurial Leadership (El), Howard F. Rudd Jr., John E. Clarkin, Thomas Kent, Robert J. Brinson Sr
Utilizing The Innovative Leadership Behavior Inventory And Relationship Marketing As Critical Elements For Teaching/Learning Entrepreneurial Leadership (El), Howard F. Rudd Jr., John E. Clarkin, Thomas Kent, Robert J. Brinson Sr
Association of Marketing Theory and Practice Proceedings 2010
The focus of this paper will be on utilizing the five-factor Leader Behavior Inventory (LBI) as the structure, and various teaching or learning pedagogy and related processes and relationships as the intervening variables in order to help entrepreneurs assess then enhance their potential leadership behavior. In turn, this should foster the decision process necessary to accomplish enterprise building or organizational development thus enhancing the cycle time for critical change. Should the LBI and associated assessment tools and processes indicate such, the best practice strategies may involve bringing in professional management, slowing the growth of the enterprise to allow for leadership …
Why Hispanic Women Wear What They Wear, Maria-Gracia Inglessis
Why Hispanic Women Wear What They Wear, Maria-Gracia Inglessis
Association of Marketing Theory and Practice Proceedings 2010
This paper is an exploration of how Hispanic women communicate their identity through clothing and how cultural values affect how they shop for clothes. Based on in-depth interviews with Hispanic women in Florida, this study demonstrates that Latinas retain overtime a set of values characteristic of the traditional Hispanic culture. This study also reveals that Hispanic women are high self-monitors and enjoy the experience of discovery when they shop. Specific implications for marketers are offered.
A Logo Selection Method, Tulay Girard, Michelle Pope
A Logo Selection Method, Tulay Girard, Michelle Pope
Association of Marketing Theory and Practice Proceedings 2010
Many companies and sports teams have revised their logos over time in efforts to reposition their brand image. Still, the need for establishing a reliable method to guide this important decision still persists. This study offers an empirical method for selecting logos for companies and/or brands by testing the perceptions of consumers using 16 bi-polar personality traits adapted from the literature. The data were collected from undergraduate marketing students for demonstration purposes. The paper proposes that the perceptions for a logo of multiple samples from the same target population will be the same. The findings support the proposition. Implications and …