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Articles 511 - 540 of 647
Full-Text Articles in Operational Research
Drive And Motion Design In Material Handling Equipment, Jorg Oser, Christian Landschutzer
Drive And Motion Design In Material Handling Equipment, Jorg Oser, Christian Landschutzer
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Drives account in many cases up to one third of the costs of material handling equipment. This fact justifies a closer look to important drive and motion issues. Typical design criteria for drives are energy and power consumption, wear, heat and noise generation. Engineering design activities start with the generation of the system configuration, that is to make appropriate topological decisions where to locate the drives in the equipment structure. These decisions define to a great extent the functional quality of the mechanical structure and the distribution of forces in the power train. For early design stages an elasto-kinetic model …
Determination Of Operational Parameters For An Efficient Container Service In The Port Of Guaymas, Cesar Meneses, J. René Villalobos
Determination Of Operational Parameters For An Efficient Container Service In The Port Of Guaymas, Cesar Meneses, J. René Villalobos
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
The port of Guaymas is located in Sea of Cortez in the Northern Pacific Coast of Mexico. Its hinterland is basically the Northwestern region of Mexico and the Southwestern United States. The Port currently focuses on bulk and liquid cargo and does not provide container services. In this paper, we explore some of the characteristics that a container service should have to be competitive in servicing the needs of the regional industry. Since the study deals with port selection decision from the industry’s point of view, we introduce a port selection model based on a Total Landed Cost (TLC) metric. …
Monitoring Inventory Accuracy With Statistical Process Control, Kyle Huschka, John R. English, Todd Easton, Andrew Huschka
Monitoring Inventory Accuracy With Statistical Process Control, Kyle Huschka, John R. English, Todd Easton, Andrew Huschka
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Inventory accuracy is critical in most industrial environments such as distribution, warehousing, and retail. Many companies use a technique called cycle counting and have realized outstanding results in monitoring and improving inventory accuracy. The time and resources to complete cycle counting are sometimes limited or not available. In this work, we promote statistical process control (SPC) to monitor inventory accuracy. Specifically, we model the complex underlying environments with mixture distributions to demonstrate sampling from a mixed but stationary process. For our particular application, we concern ourselves with data that result from inventory adjustments at the stock keeping unit (SKU) level …
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 …
Investigating Possible Synergies In Intermodal Operations With Truck And Rail, G. Don Taylor, Mia K. Burns, Gary L. Whicker
Investigating Possible Synergies In Intermodal Operations With Truck And Rail, G. Don Taylor, Mia K. Burns, Gary L. Whicker
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
As the trucking industry continues to examine ways to provide better service at lower cost, many companies are more heavily utilizing intermodal (IM) strategies between truck and rail, especially for those loads that are relatively non-critical in terms of delivery time requirements and that have longer lengths of haul. As IM business grows, supporting dray infrastructure naturally develops around IM rail yards. What is unknown is whether it is best to have a dedicated set of drivers performing dray operations or if efficiency and cost savings can result when utilizing a joint driving fleet to concurrently support IM and traditionally …
Modeling Initial Response: Firefighter High-Rise Access Time Simulation, Robert Till
Modeling Initial Response: Firefighter High-Rise Access Time Simulation, Robert Till
Publications and Research
Historically, a high-rise building has been described as one which (1) was taller than the reach of fire
service apparatus and, therefore, required interior firefighting, (2) posed the potential for significant
stack effect (vertical interior smoke movement), and (3) required unreasonable time for occupant
evacuation. High-rise buildings require firefighters to access the building and travel to an upper fire
floor by using either stairs or elevators. The fire continues to grow during the time needed to apply
water on the fire. This paper demonstrates ways for using Discrete Event Simulation (DES) to estimate
the time for firefighters to access a …
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 …
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 …
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.
Strategic Design Of A Robust Supply Chain, Marc Goetschalckx, Edward Huang
Strategic Design Of A Robust Supply Chain, Marc Goetschalckx, Edward Huang
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
The strategic design of a robust supply chain has as goal the configuration of the supply chain structure so that the performance of the supply chain remains of a consistently high quality for all possible future scenarios. We model this goal with an objective function that trades off the central tendency of the supply chain profit with the dispersion of the profit as measured by the standard deviation for any value of the weights assigned to the two components. However, the standard deviation, used as the dispersion penalty for profit maximization, has a square root expression which makes standard maximization …
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 …
Comparing Transport Policies In A Full-Scale 300mm Wafer Manufacturing Facility, J. E. Kiba, S. Dauz`Ere-P´Er`Es, C. Yugma, G. Lamiable
Comparing Transport Policies In A Full-Scale 300mm Wafer Manufacturing Facility, J. E. Kiba, S. Dauz`Ere-P´Er`Es, C. Yugma, G. Lamiable
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
Research in semiconductor manufacturing ideally wants to determine the “best” transport policy to ensure continuous production. Determining such a policy is difficult because it depends on many factors such as the layout, the product types, the equipment, etc. Most of the transport policies found in the literature combine dispatching policies (scheduling of transport requests) and routing policies (selection of the path to move from one point to another). This paper investigates a policy called "minimum service" which consists in keeping a minimum number of available vehicles in bays, so that they can quickly answer transport requests and empty travel times …
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.
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 …
Plug-And-Work Material Handling Systems, Kai Furmans, Frank Schonung, Kevin R. Gue
Plug-And-Work Material Handling Systems, Kai Furmans, Frank Schonung, Kevin R. Gue
11th IMHRC Proceedings (Milwaukee, Wisconsin. USA – 2010)
One disadvantage of automated material handling systems is their relative Inflexibility: once racks are installed and conveyors are laid, making even mi-nor changes to a system can be cumbersome and expensive. However, recent progress in the capabilities and cost of basic system components, such as controllers, drives, and sensors, has made possible a new class of material handling systems having a much higher degree of flexibility. We propose underlying de- sign principles for such systems and describe several prototype plug-and-work" systems, which feature decentralized control and ease of reconfiguration.
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 …
Learning Without Default: A Study Of One-Class Classification And The Low-Default Portfolio Problem, Kenneth Kennedy, Brian Mac Namee, Sarah Jane Delany
Learning Without Default: A Study Of One-Class Classification And The Low-Default Portfolio Problem, Kenneth Kennedy, Brian Mac Namee, Sarah Jane Delany
Conference papers
This paper asks at what level of class imbalance one-class classifiers outperform two-class classifiers in credit scoring problems in which class imbalance, referred to as the low-default portfolio problem, is a serious issue. The question is answered by comparing the performance of a variety of one-class and two-class classifiers on a selection of credit scoring datasets as the class imbalance is manipulated. We also include random oversampling as this is one of the most common approaches to addressing class imbalance. This study analyses the suitability and performance of recognised two-class classifiers and one-class classifiers. Based on our study we conclude …
Operational Knowledge Transfer In Municipal Utility Organizations, G. Christian Guvemator Iv
Operational Knowledge Transfer In Municipal Utility Organizations, G. Christian Guvemator Iv
Engineering Management & Systems Engineering Theses & Dissertations
Municipal water and wastewater utility systems experience several challenges related to maintaining an experienced operations workforce. One of these issues is the loss of operational knowledge as the current experienced workforce reaches the age of retirement. The future success of system operability depends upon a process that transfers the knowledge of the experienced employee into the organization before he or she retires. Recent investigations highlight the importance of, and the methods for, knowledge transfer; however, current literature does not include significant information on the municipal utility industry. The objective of this investigation is to identify how operational knowledge is being …
Qualitative Mapping For Understanding The Collective Judgment Building Process : A Study Of The Federal Open Market Committee, Hyunjung Kim
Qualitative Mapping For Understanding The Collective Judgment Building Process : A Study Of The Federal Open Market Committee, Hyunjung Kim
Legacy Theses & Dissertations (2009 - 2024)
This study develops a mapping method for studying a collective judgment building process in a decision-making group. Environmental uncertainties and a lack of information require a decision maker to make judgments about various issues relevant to the decision task. In a group setting, the members together weave their structural model of the system with available information to build a collective judgment for the decision task.
Egypt's Information Society Strategy: A Critical Lexicography, Neil Mcbride, Bernd Carsten Stahl
Egypt's Information Society Strategy: A Critical Lexicography, Neil Mcbride, Bernd Carsten Stahl
Journal of International Technology and Information Management
The development of ICT policies within developing countries in the past ten years has opened up a new area for study. These documents chart the ambitions of the countries for the use of ICT to promote rapid development. As such they are intercultural documents, developing at the interface between the culture of the country and western economic culture. This paper develops a critical approach to understanding these documents and studying their message. The approach involves the preparation of a critical dictionary which identifies relevant terms within the ICT policy document and reflects on their multiple meanings. The approach was applied …
Usability Investigation Of E-Business Web-Based Forms, Gerald V. Post, Albert Kagan, Betsy Page Sigman
Usability Investigation Of E-Business Web-Based Forms, Gerald V. Post, Albert Kagan, Betsy Page Sigman
Journal of International Technology and Information Management
Usability on Web sites is critical because almost no training is provided for users on commercial sites. Instead, Web design relies on standards and consistency across sites. Traditional usability results indicated that computer forms should follow paper-based forms. Yet, Web paradigms have evolved that are quite different from paper-based forms. Specifically, this study reveals that users commit fewer errors and prefer simple forms limited to a single concept per screen. This conclusion significantly alters the recommendations for designing business forms.
Formal Verification Of Urban Traffic System Using The Concept Of Fuzzy Workflow Simulation, Manuj Darbari, Abhay Kumar Srivastava, Sanjay Medhavi
Formal Verification Of Urban Traffic System Using The Concept Of Fuzzy Workflow Simulation, Manuj Darbari, Abhay Kumar Srivastava, Sanjay Medhavi
Journal of International Technology and Information Management
Modeling complex urban traffic system requires extensive use of workflow methodologies which can simulate almost real time traffic situations. Number of studies were done in the field of Urban Traffic Simulation like PLOTS, NETSIM and PALAMICS but none of them could provide a real formal solution. Our paper proposes a methodology using Fuzzy Petri nets for modeling real time traffic system. Fuzzy Petrinets are also visualised and tested by using Flow- Charter and HPSIM software packages. These packages help in providing successive iterations of process model for further refinement.
Supporting The Virtual Community: Social Bookmarking As A User- Based Classification Scheme In A Knowledge Library, Nicole Lytle, Tony Coulsom
Supporting The Virtual Community: Social Bookmarking As A User- Based Classification Scheme In A Knowledge Library, Nicole Lytle, Tony Coulsom
Journal of International Technology and Information Management
Knowledge libraries hold the promise of widespread access to information available anywhere, anytime, freeing patrons from the geographical and temporal boundaries that currently exist. The classification of materials and subsequent searching of knowledge library content is an overall problem with many complex parts. Relevant classification is important for optimal information retrieval. This is especially important for the virtual communities that exist with extended organizations. Rooted in the virtual community and digital library literature, this paper develops a theory for improving the information classification and retrieval process of knowledge libraries that support virtual communities by applying social bookmarking techniques.
Rapid Development Of Multimedia Instructional Modules For Information Technology Education, Nanda Ganesan
Rapid Development Of Multimedia Instructional Modules For Information Technology Education, Nanda Ganesan
Journal of International Technology and Information Management
A multifaceted learning model was developed for implementing e-learning in a largely commuter campus. The primary objective of the model was to build a flexible learning environment that combined the learning effectiveness of in-class learning with the flexibility and accessibility of online learning. One of the components of the model was the multimedia instructional modules produced to teach various Information Technology courses. Several different types of modules were produced representing chalk-and-talk type of lectures, PowerPoint presentations and software tutorials. The chalk-and-talk type of lecture modules and the software tutorials that emulated the in-class learning experience contributed positively towards enhancing the …
Can Information Systems Foster Emotional Intelligence? A Design Theory-Based Approach, Richard J. Burkhard, Thomas A. Horan, Brian N. Hilton, Michael Leih
Can Information Systems Foster Emotional Intelligence? A Design Theory-Based Approach, Richard J. Burkhard, Thomas A. Horan, Brian N. Hilton, Michael Leih
Journal of International Technology and Information Management
Researchers in Information Systems (IS) have conducted extensive research into various kinds of collaboration systems over the last twenty-five years. A parallel stream of inquiry in psychology and management has developed research in organizational Emotional Intelligence, which contributes to the effectiveness of group interactions by increasing cooperation and reducing conflict. Collaboration systems present a special opportunity to introduce soft management functions such as Emotional Intelligence because they are designed as an intelligent channel of interaction between group members. This research used an Information Systems Design Theory approach to guide the integration of Emotional Intelligence functions into collaboration systems. Two artifact …
Business Risks: When Is Fails To Detect Circumvention Activities, Stanley X. Lewis Jr., J. Scott Magruder, Eddy J. Burks, Carl Smolinski
Business Risks: When Is Fails To Detect Circumvention Activities, Stanley X. Lewis Jr., J. Scott Magruder, Eddy J. Burks, Carl Smolinski
Journal of International Technology and Information Management
A business must recognize and address various risk factors when establishing and maintaining its information system. The overall risk to management is that the control environment does not protect proprietary business data and the financial reporting system that produces financial statements and other information used by investors, creditors and regulatory agencies. These risks require that management implement efforts to ensure the integrity and effectiveness of control procedures over business activities while being aware of additional system issues such as failing to adequately consider other risks which are more business-oriented including the risk of failing to prevent or detect fraudulent or …
Research On Logistic Management In Deltai Medical Company, Yan Hu
Research On Logistic Management In Deltai Medical Company, Yan Hu
World Maritime University Dissertations
No abstract provided.
Research On Information Integration Of Zhoushan Port And Its External Environment, Peiyao Lu
Research On Information Integration Of Zhoushan Port And Its External Environment, Peiyao Lu
World Maritime University Dissertations
No abstract provided.
The Research On Container Operations At Container Freight Station And Rfid Implementation, Kasarla Naga Chandra Mohan
The Research On Container Operations At Container Freight Station And Rfid Implementation, Kasarla Naga Chandra Mohan
World Maritime University Dissertations
No abstract provided.
Radical Impact Of Change In Actions And Confidence Index On Reverse Decision Making An Application Based Study, Swatee Trimbak Paithankar
Radical Impact Of Change In Actions And Confidence Index On Reverse Decision Making An Application Based Study, Swatee Trimbak Paithankar
Engineering Management & Systems Engineering Theses & Dissertations
While making decisions under uncertainty, people are often unaware of the logical approach to form the decision process. It is assumed that collecting details, analyzing and evaluating data is enough to make 'proper' decisions. However, past research in the decision making arena has significantly validated that there exists a class of decision problems which is complex, ill-structured and not defined to the level where decision makers can draw logical conclusions based on existing traditional decision approaches. RDM (reverse decision making), one of the novel approaches of decision making under conditions of uncertainty, has shown potential towards addressing some of these …