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University of Arkansas, Fayetteville

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Articles 241 - 260 of 260

Full-Text Articles in Operations Research, Systems Engineering and Industrial Engineering

Empirical Analysis Of The Relay Network Design Problem, Sergio Maldonado Soria Galvarro Dec 2011

Empirical Analysis Of The Relay Network Design Problem, Sergio Maldonado Soria Galvarro

Industrial Engineering Undergraduate Honors Theses

Definition and optimization of alternative methods for truckloads routing.

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Office Hour Scheduling Tool, Tyler Dunlap Dec 2011

Office Hour Scheduling Tool, Tyler Dunlap

Industrial Engineering Undergraduate Honors Theses

When an instructor (with or without student input) specifies her office hours for the semester, the informal process used often results in students experiencing conflicts with other lectures, labs, drills, or office hours. The result of this conflict is the student either scheduling individual meetings with teachers outside of their office hours or students missing the opportunity to get assistance from the instructor all together. Either outcome is undesirable, as it either takes additional faculty time from their other responsibilities or jeopardizes the performance of a student in their classes. One valid approach to solving this problem is through the …

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Adaptive Intensity Modulated Radiation Therapy Planning Optimization With Changing Tumor Geometry And Biology Enforcing Both Cumulative And Fraction Size Dose Constraints, Behlul Saka Dec 2011

Adaptive Intensity Modulated Radiation Therapy Planning Optimization With Changing Tumor Geometry And Biology Enforcing Both Cumulative And Fraction Size Dose Constraints, Behlul Saka

Graduate Theses and Dissertations

Intensity Modulated Radiation Therapy (IMRT) is a modern technique of delivering radiation treatments to cancer patients. In IMRT technology, intensities must be chosen for the many small unit grids into which the beams are divided to produce a desired distribution of dose at points throughout the body with the goal of maximizing dose delivered to the tumor while sparing healthy tissues from excessive radiation and keeping dose homogeneous across the tumor. Although IMRT plans are optimized as a single overall treatment plan, they are delivered over 30-50 treatment sessions (fractions) and both cumulative and per-fraction dose constraints apply. The extended …

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Improvements On Just-About-Right (Jar) Scales As Product Optimization Tools Using Kano Modeling Concepts, Bangde Li Dec 2011

Improvements On Just-About-Right (Jar) Scales As Product Optimization Tools Using Kano Modeling Concepts, Bangde Li

Graduate Theses and Dissertations

Attribute Kano characteristics are useful in product design to prioritize development efforts. However, attribute Kano characteristics have not been discussed and applied to product optimization when using Just-About-Right (JAR) scales. Product optimizations without identifying attributes Kano characteristics can be misleading. The two objectives in this research were: 1. Determine attribute Kano categories using a modified classic Kano classification methodology. 2. Propose a method to measure attribute performance and identify attribute Kano characteristics to direct product optimization. Two methodologies of attribute Kano classification were investigated. In experiment one, a modified classic Kano methodology was employed to determine attribute Kano categories through …

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Inventory Models For Intermittent Highly Variable Demand And Policy Parameter Adjustments To Meet Desired Service Level Requirements, Yasin Unlu Dec 2011

Inventory Models For Intermittent Highly Variable Demand And Policy Parameter Adjustments To Meet Desired Service Level Requirements, Yasin Unlu

Graduate Theses and Dissertations

This dissertation consists of three assays. The first assay examines the robustness of lead time demand models for the continuous review (r;Q) inventory policy. A number of classic distributions as well as distribution selection rules are examined under a wide variety of demand conditions. First, the models are compared to each other by assuming a known demand process and evaluating the errors associated with using a different model. Then, the models are examined using a large sample of simulated demand conditions. Approximation results of inventory performance measures - ready, rate excepted number of backorders and on-hand inventory levels are reported. …

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Integrated Planning For Rural Rail Transportation, Jeffrey Cohan Gwaltney Dec 2011

Integrated Planning For Rural Rail Transportation, Jeffrey Cohan Gwaltney

Graduate Theses and Dissertations

Population growth in rural areas has led to new interest in rail transportation. Planning a passenger rail system involves numerous difficult decisions, most representing a trade-off between customer service and cost. In this work, we attempt to integrate many of these planning decisions. We consider strategic decisions such as station location and vehicle procurement, as well as tactical issues that include vehicle scheduling. Our integrated model exploits the linear network structure that best suits many rural American communities, including Northwest Arkansas. Due to the intractability of the integrated rail planning problem, we have developed a customized heuristic approach to solve …

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Applying Inventory Control Practices Within The Sisters Of Mercy Health Care Supply Chain, Server Apras Aug 2011

Applying Inventory Control Practices Within The Sisters Of Mercy Health Care Supply Chain, Server Apras

Graduate Theses and Dissertations

This research lays a foundation for the better understanding of the application and acceptance of more advanced inventory control practices within the health care supply chain. The demand characteristics and optimal control policies for pharmaceutical items within a multi-echelon provider network are examined within the framework of a case study. Demand forecasting algorithms were applied to forecast demand for inventory control procedures. A spreadsheet-based inventory planning tool was used to minimize the inventory holding and ordering costs subject to fill rate constraints. The costs of inventory control models are compared to the current ordering and inventory control strategies to document …

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Evaluating The Capacity Of A Proton Therapy Facility, Ridvan Gedik Aug 2011

Evaluating The Capacity Of A Proton Therapy Facility, Ridvan Gedik

Graduate Theses and Dissertations

A relatively new consideration in proton therapy planning is the requirement that the mix of patients treated satisfy desired percentages. Since it is very dicult to satisfy an integer number of patients in light of these requirements, deviations from patient mix preferences and their impacts on operational capabilities are of particular interest to healthcare planners. Therefore, we propose a bicriteria mathematical programming model that determines an outpatient schedule maximizing the number of fractions and minimizing the deviations from the patient mix ratios over the planning horizon. The tradeos between the two objectives are identied through analysis of ecient frontiers. Our …

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An Empirical Investigation Of Supply Chain Excellence In Healthcare, Brian Keith Smith Aug 2011

An Empirical Investigation Of Supply Chain Excellence In Healthcare, Brian Keith Smith

Graduate Theses and Dissertations

This research is motivated by opportunities to improve the cost and quality of healthcare delivery through improved supply chain processes. This research assesses the quality of the healthcare supply chain and identifies factors that are driving supply chain excellence among organizations in the healthcare industry. The first objective of this research is to assess the state of quality measurement in the healthcare supply chain. The achievement of this first objective is presented in Chapter 3 of this dissertation in the form of a manuscript accepted for publication in The Quality Management Journal. The second research objective is to develop …

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Development Of A Ram Shared Service Tool For The Service Availability Of On-Board And Trackside Systems, Bailey Frazier May 2011

Development Of A Ram Shared Service Tool For The Service Availability Of On-Board And Trackside Systems, Bailey Frazier

Industrial Engineering Undergraduate Honors Theses

A decision-support tool designed specifically to be used by technical specialists is an aid that would be helpful to many different companies, departments and projects – regardless of industry. With the intent of making manual processes quicker, less error-prone, and more userfriendly, decision-support tools are becoming more desired as they grow increasingly more common in the business world today.
The decision-support tool created for the purpose of this project is not an exception to any of these reasons. The ALSTOM Transport Information Solutions Reliability, Availability, and Maintainability (RAM) Shared Service Team bears the burden and tedious process of working with …

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Re-Estimating And Remodeling General Aviation Operations, Ryan Black May 2011

Re-Estimating And Remodeling General Aviation Operations, Ryan Black

Industrial Engineering Undergraduate Honors Theses

The objective of this project is to understand the usual or “acceptable” characteristics of general aviation flights and airports so that unusual activity can be detected, analyzed, and resolved. To do this, a quality control model may be built to determine whether an airport is at high risk for a terrorist attack. For an appropriate model to be built there must be an adequate amount of data that describes the general aviation airport and its operations. In order to facilitate this data the general aviation industry must “continue to improve intelligence and information sharing (Homeland Security Advisory Council 2008).” This …

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Incorporating Vertical Travel Into Non-Traditional Cross Aisles For Unit-Load Warehouse Designs, Kirby A. Clark May 2011

Incorporating Vertical Travel Into Non-Traditional Cross Aisles For Unit-Load Warehouse Designs, Kirby A. Clark

Industrial Engineering Undergraduate Honors Theses

We propose modifications to the travel-time models for non-traditional warehouse layouts, Flying-V Fishbone, by incorporating a vertical travel dimension. The Flying-V model determines a cross aisle intersection for every picking aisle, while the Fishbone model determines a single point where the inserted cross aisle intersects the side of the warehouse. The shape and angle of the cross aisle is unrestricted for the Flying-V layout, while the angle is unrestricted for the Fishbone layout. The resulting non-linear optimization models incorporate Chebychev travel within the picking aisles. We compare both the shape of the aisle and the percent improvement over a traditional …

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Simulation Of Multicultural Factors In Terrorism Networks, Jared Townsley May 2008

Simulation Of Multicultural Factors In Terrorism Networks, Jared Townsley

Industrial Engineering Undergraduate Honors Theses

As globalization extends its influence to the far corners of the world, rapid developments and changes are taking place economically, socially, and environmentally. Cultural differences between and within organizations have become significant during the past few years as politics and marketplaces expand globally to include multiple nationalities, beliefs, and value systems. Unfortunately, terrorism has also felt the effects of globalization as organizations such as Al-Qaeda seek to expand their influence worldwide. Although a considerable amount of research has been conducted to identify key cultural factors that play major roles within organizations, simulation models that attempt to quantify cultural effects are …

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Evaluating Arkansas Roadway Intersection Accidents Using Traffic Safety Analysis Methods: Generalized Estimating Equations And Roadway Observation, Jacob Mercer May 2008

Evaluating Arkansas Roadway Intersection Accidents Using Traffic Safety Analysis Methods: Generalized Estimating Equations And Roadway Observation, Jacob Mercer

Industrial Engineering Undergraduate Honors Theses

Considerable research has been made in recent years to evaluate road traffic safety. This is especially true with the United States, whose international rank in public safety is rapidly declining. In 2004, Arkansas ranked as the third highest in traffic fatalities among all the states. These are striking numbers that reflect the lack of attention that the state has received in terms of evaluating road traffic safety. Historically, this safety is measure by one of two methods: Statistical analyses of historical data or hands-on, observational analyses of present safety conditions. Rarely in research are both methods used within the same …

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Comparison Of Simulation-Based Schedule Generation Methodologies For Semiconductor Manufacturing, Wenfeng Li May 2007

Comparison Of Simulation-Based Schedule Generation Methodologies For Semiconductor Manufacturing, Wenfeng Li

Industrial Engineering Undergraduate Honors Theses

Although a number of approaches have been developed to schedule tasks or jobs in many different manufacturing environments, increasing manufacturing complexity continues to motivate the need for additional scheduling heuristic research and development. This is particularly true for semiconductor manufacturing operations, arguably the most complex manufacturing environment in existence. Simulation-based scheduling has shown recent promise as a means for developing schedules for dynamic, stochastic manufacturing environments. I investigate the potential advantages and drawbacks of using simulation-based scheduling in a complex job shop as motivated by a semiconductor wafer fab.

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A Study Of The Impact Of Prognostic Errors On System Performance, Mauricio Carrasco Jan 2006

A Study Of The Impact Of Prognostic Errors On System Performance, Mauricio Carrasco

Inquiry: The University of Arkansas Undergraduate Research Journal

Condition-based maintenance is growing in popularity as a means of improving equipment maintenance efficiency. Whether it be the maintenance of an airplane, a computer system, or any type of physical system, the prognostic tools associated with condition-based maintenance are subject to statistical error. These errors can lead to unnecessary preventive maintenance due to underestimation of system remaining life and unnecessary system failures due to overestimation of system remaining life. What is not clear is if these statistical errors outweigh the benefits of a condition-based maintenance policy. This study attempts to address this concern through the evaluation and comparison of three …

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The Need For Pfc Abatement In Semiconductor Manufacturing, Mohsen Manesh, Brian Kendrick Jan 2002

The Need For Pfc Abatement In Semiconductor Manufacturing, Mohsen Manesh, Brian Kendrick

Inquiry: The University of Arkansas Undergraduate Research Journal

Perfluorocompounds (PFCs) are highly stable chemical compounds used in two integral steps of semiconductor manufacturing: chemical vapor deposition (CVD) chambers and etch chambers. Unfortunately, PFCs are also greenhouse gases linked to global warming. This, combined with their long atmospheric lifetimes gives them global warming potentials much higher than C02 the principal greenhouse gas. In a series of voluntary agreements with the United States and other national governments, the worldwide semiconductor industry has set a goal of reducing PFC emissions to 90% of their 1995 levels. To reach this goal, researchers have explored four main methods of reduction: substitution of PFCs, …

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Retrieval Of Atmospheric Turbidity Coefficiant And Water Column Density Fro Solar Irradiance Data, Felix Tendeku Jan 1995

Retrieval Of Atmospheric Turbidity Coefficiant And Water Column Density Fro Solar Irradiance Data, Felix Tendeku

Journal of the Arkansas Academy of Science

Ground-based measurement of solar irradiance has been made using a spectroradiometer at wavelengths inapx-water absorption band. An algorithm is formulated to retrieve simultaneously the atmospheic water column density and Angstrom's turbidity coefficient. The transmission models used to account for the contribution from diverse atmospheic absorbing and scattering elements are presented.

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Method For Determining Atmospheric Aerosol Optical Depth Using Solar Transmission Measurements, Felix Tendeku Jan 1994

Method For Determining Atmospheric Aerosol Optical Depth Using Solar Transmission Measurements, Felix Tendeku

Journal of the Arkansas Academy of Science

A multiple wavelength radiometer instrumentation has been developed and used to measure solar irradiance in a water vapor absorption band in the near-infrared region. From these measurements the total atmospheric optical depth at each wavelength of observation is deduced using a linear least-squares fitting method. An iteration technique, based on a power law wavelength dependence of aerosol optical depth, is employed to retrieve aerosol optical depth from the total optical depth data. The technique permits simultaneous determination of precipitable water vapor amount.

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Synthetic Fiber Industry- A Story In Industrial Location, Leonard D. Goranson Jan 1958

Synthetic Fiber Industry- A Story In Industrial Location, Leonard D. Goranson

Journal of the Arkansas Academy of Science

No abstract provided.

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