Matching Items (33)

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Operations Research Contributions to Emergency Department Patient Flow Optimization: A Review

Description

In recent years, Operations Research (OR) has had a signicant impact on improving the performance of hospital Emergency Departments (EDs). This includes improving a wide range of processes involving patient

In recent years, Operations Research (OR) has had a signicant impact on improving the performance of hospital Emergency Departments (EDs). This includes improving a wide range of processes involving patient ow from the initial call to the ED through disposition, discharge home, or admission to the hospital. We mainly seek to illustrate the benet of OR in EDs, and provide an overview of research performed in this vein to assist both researchers and practitioners. We also elaborate on possibilities for future researchers by shedding light on some less studied aspects that can have valuable impacts on practice.

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Date Created
  • 2013-12

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Applying Industrial Engineering to Optimize Swim Stroke Economy

Description

The U.S. Navy and other amphibious military organizations utilize a derivation of the traditional side stroke called the Combat Side Stroke, or CSS, and tout it as the most efficient

The U.S. Navy and other amphibious military organizations utilize a derivation of the traditional side stroke called the Combat Side Stroke, or CSS, and tout it as the most efficient technique available. Citing its low aerobic requirements and slow yet powerful movements as superior to the traditionally-best front crawl (freestyle), the CSS is the go-to stroke for any operation in the water. The purpose of this thesis is to apply principles of Industrial Engineering to a real-world situation not typically approached from a perspective of optimization. I will analyze pre-existing data about various swim strokes in order to compare them in terms of efficiency for different variables. These variables include calories burned, speed, and strokes per unit distance, as well as their interactions. Calories will be measured by heart rate monitors, converting BPM to calories burned. Speed will be measured by stopwatch and observer. Strokes per unit distance will be measured by observer. The strokes to be analyzed include the breast stroke, crawl stroke, butterfly, and combat side stroke. The goal is to informally test the U.S. Navy's claim that the combat side stroke is the optimum stroke to conserve energy while covering distance. Because of limitations in the scope of the project, analysis will be done using data collected from literary sources rather than through experimentation. This thesis will include a design of experiment to test the findings here in practical study. The main method of analysis will be linear programming, followed by hypothesis testing, culminating in a design of experiment for future progress on this topic.

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Date Created
  • 2014-12

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Case Study: Performance Information Procurement System (PIPS) with the Arizona Department of Environmental Quality

Description

The Arizona Department of Environmental Quality (ADEQ) experienced a problem with the quality of their services. The agency was expending a large amount of resources, both time and money to

The Arizona Department of Environmental Quality (ADEQ) experienced a problem with the quality of their services. The agency was expending a large amount of resources, both time and money to control contractors' work with unexpected poor quality work. ADEQ partnered with Dr. Dean Kashiwagi and the Performance Based Studies Research Group (PBSRG) early in 2014 to find a solution to the procurement problems. PBSRG introduced the Performance Information Procurement System (PIPS) and began implementation on four test projects. Three of the projects have moved into the execution phase delivering almost $100K savings in the procurement process alone. The three main causes of the issues were: lack of a system identifying the quality of vendors, management, direction, and control (MDC), and lack of a system to track vendor performance. Best value PIPS is a paradigm shift from the traditional price-based model and has succeeded in mitigating these challenges for the industry, while also validating the PBSRG model.

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Date Created
  • 2014-12

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Early Career Performance Models: Regression-Based Forecasting Models for Predicting Future Major League Baseball Player Performance

Description

The widespread use of statistical analysis in sports-particularly Baseball- has made it increasingly necessary for small and mid-market teams to find ways to maintain their analytical advantages over large market

The widespread use of statistical analysis in sports-particularly Baseball- has made it increasingly necessary for small and mid-market teams to find ways to maintain their analytical advantages over large market clubs. In baseball, an opportunity for exists for teams with limited financial resources to sign players under team control to long-term contracts before other teams can bid for their services in free agency. If small and mid-market clubs can successfully identify talented players early, clubs can save money, achieve cost certainty and remain competitive for longer periods of time. These deals are also advantageous to players since they receive job security and greater financial dividends earlier in their career. The objective of this paper is to develop a regression-based predictive model that teams can use to forecast the performance of young baseball players with limited Major League experience. There were several tasks conducted to achieve this goal: (1) Data was obtained from Major League Baseball and Lahman's Baseball Database and sorted using Excel macros for easier analysis. (2) Players were separated into three positional groups depending on similar fielding requirements and offensive profiles: Group I was comprised of first and third basemen, Group II contains second basemen, shortstops, and center fielders and Group III contains left and right fielders. (3) Based on the context of baseball and the nature of offensive performance metrics, only players who achieve greater than 200 plate appearances within the first two years of their major league debut are included in this analysis. (4) The statistical software package JMP was used to create regression models of each group and analyze the residuals for any irregularities or normality violations. Once the models were developed, slight adjustments were made to improve the accuracy of the forecasts and identify opportunities for future work. It was discovered that Group I and Group III were the easiest player groupings to forecast while Group II required several attempts to improve the model.

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Date Created
  • 2013-05

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Can Beauty Coexist with Brains? Perceptions of NFL Cheerleaders

Description

The definition of "beauty" can be interpreted in many ways but when defining it literally, it is considered as such: "a combination of qualities that pleases the intellect or moral

The definition of "beauty" can be interpreted in many ways but when defining it literally, it is considered as such: "a combination of qualities that pleases the intellect or moral sense" (Oxford Dictionaries). Beauty simply "pleases" the intellect; it does not say that intellect is a factor of beauty itself. Beauty is nice to look at, a mere pleasure to experience in the "moral sense." It does not have anything to do with one's actions, principles or intelligence, but instead the way one presents himself or herself. If someone is deemed as intellectual, does that mean they are not viewed as beautiful? Is that why beauty is rarely associated with brains and vice versa? Has a history of stereotypes and media interference convinced us that these two concepts cannot coexist? And what if we found out that they did? Could we take that person seriously? I decided to challenge the idea of beauty and brains, and see if beauty is in fact measured by its literal definition and controlled by its assumed stereotype, or if other factors apply when deciphering someone's "beauty." First, I will analyze the perceptions and stereotypes of engineers. By looking at the public opinion of both engineers and women engineers, I can show the common struggles engineers face. Next I will look at perceptions of cheerleaders, in particular, professional cheerleaders. Through analyzing current stereotypes and gender roles associated with these women in the spotlight, I can establish how opinions of these women are formed. I will also look at a survey of a sample of Arizona State University students in which we can confirm or deny the results found through research of previous studies. We will also be able to gather personal opinions about why these stereotypes exist and how to break them down. Finally, we will look at personal accounts of current or retired National Football League (NFL) cheerleaders. These will give first-hand examples of what it is like to be both a cheerleader and a woman in STEM (science, technology, engineering, and mathematics).

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Date Created
  • 2013-05

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Intervention Strategies for the DoD Acquisition Process Using Simulation

Description

The current Enterprise Requirements and Acquisition Model (ERAM), a discrete event simulation of the major tasks and decisions within the DoD acquisition system, identifies several what-if intervention strategies to improve

The current Enterprise Requirements and Acquisition Model (ERAM), a discrete event simulation of the major tasks and decisions within the DoD acquisition system, identifies several what-if intervention strategies to improve program completion time. However, processes that contribute to the program acquisition completion time were not explicitly identified in the simulation study. This research seeks to determine the acquisition processes that contribute significantly to total simulated program time in the acquisition system for all programs reaching Milestone C. Specifically, this research examines the effect of increased scope management, technology maturity, and decreased variation and mean process times in post-Design Readiness Review contractor activities by performing additional simulation analyses. Potential policies are formulated from the results to further improve program acquisition completion time.

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Date Created
  • 2013-05

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Intercultural Negotiation and Risk Mitigation

Description

In an increasingly global economy, companies face challenges with implementing successful business and marketing strategies in cultures different from their own. This paper calls upon previous research to compile a

In an increasingly global economy, companies face challenges with implementing successful business and marketing strategies in cultures different from their own. This paper calls upon previous research to compile a per-country outline of general behaviors and expectations when doing business overseas. Using categorical definitions from Hofstede's 1984 study and those found in the Handbook of Global and Multicultural Negotiation, a table has been prepared to group similar countries based on their cultural biases.

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Date Created
  • 2013-05

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The Elimination of Career Path Decision Making

Description

Abstract The purpose of this project is to utilize the models and concepts from Information Measurement Theory (IMT) to help minimize future decision making with respect to my career path.

Abstract The purpose of this project is to utilize the models and concepts from Information Measurement Theory (IMT) to help minimize future decision making with respect to my career path. When I began this project, my future was clouded, my initial conditions were unknown, my stress over future career-path decisions was high, and I had eight possible career paths in mind. I have narrowed my career-path options from eight to four. In addition, I have determined a one-year plan that enables me to be prepared to pursue any of the four career paths that I have found align with me. In this project, I explored my dominant initial conditions with respect to my career path. I tracked the job history of my grandparents and parents. These efforts allowed me to identify the strengths and weaknesses that I was exhibiting by the age of three. Natural law dictates that the strengths and weaknesses of my younger self will be the same strengths and weakness that I excel at and struggle with today. I then used my understanding of natural law and the event model process to map the strengths and weaknesses of my parents and grandparents and to compare and contrast these to my strengths and weaknesses, including those that were apparent by the time that I was three years old. Focusing in on what I really want from a job, four main goals were established to grade the various future career-path options. Finally, I documented my transition from uncertainty to clarity. It began with my sobriety and ended with a milestone one-year plan that will give me information that I need to commit to my career path. This transition has had significant impact. The elusive "who am I" has been addressed, not completely but addressed sufficiently so that the question no longer plagues me. I know from where I have come. I have gained significant insight from those around me who know me. All of this has been documented for my own personal use, and for my children someday. This process permitted me to eliminate outliers from my eight original career paths, reducing them to four. In addition, application of IMT models and concepts has allowed me to see one year into the future. With my new-found knowledge, I will listen and watch the doors close on three of the remaining four career paths, as there is only one path I am meant to take.

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Date Created
  • 2014-05

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Optimal Scheduling of the Refurbishment of Rotable Parts in an Aircraft Maintenance System

Description

The efficient refurbishment of rotable parts on an aircraft proves to be a main concern for airline carriers today. Airlines must be able to seamlessly rotate parts into and out

The efficient refurbishment of rotable parts on an aircraft proves to be a main concern for airline carriers today. Airlines must be able to seamlessly rotate parts into and out of the system for maintenance in accordance with FAA requirements while leaving daily operations uninterrupted. In this paper, we develop an airline maintenance scheduling model that constructs an optimal schedule for part maintenance over a given time horizon using deterministic forecasting techniques. The model generates a schedule that minimizes the total cost of a maintenance schedule solution while maximizing the utility of all parts in the system. The model is then tested against actual network data of three part types crucial to airline operations and used to investigate the current data collection processes of US Airways maintenance lead time metrics. Manual sensitivity analysis is performed to generate the marginal value of each parameter and potential model extensions are highlighted as a result of these conclusions.

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Date Created
  • 2013-12

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Statistical Analysis of Power Differences between Experimental Design Software Packages

Description

Based on findings of previous studies, there was speculation that two well-known experimental design software packages, JMP and Design Expert, produced varying power outputs given the same design and user

Based on findings of previous studies, there was speculation that two well-known experimental design software packages, JMP and Design Expert, produced varying power outputs given the same design and user inputs. For context and scope, another popular experimental design software package, Minitab® Statistical Software version 17, was added to the comparison. The study compared multiple test cases run on the three software packages with a focus on 2k and 3K factorial design and adjusting the standard deviation effect size, number of categorical factors, levels, number of factors, and replicates. All six cases were run on all three programs and were attempted to be run at one, two, and three replicates each. There was an issue at the one replicate stage, however—Minitab does not allow for only one replicate full factorial designs and Design Expert will not provide power outputs for only one replicate unless there are three or more factors. From the analysis of these results, it was concluded that the differences between JMP 13 and Design Expert 10 were well within the margin of error and likely caused by rounding. The differences between JMP 13, Design Expert 10, and Minitab 17 on the other hand indicated a fundamental difference in the way Minitab addressed power calculation compared to the latest versions of JMP and Design Expert. This was found to be likely a cause of Minitab’s dummy variable coding as its default instead of the orthogonal coding default of the other two. Although dummy variable and orthogonal coding for factorial designs do not show a difference in results, the methods affect the overall power calculations. All three programs can be adjusted to use either method of coding, but the exact instructions for how are difficult to find and thus a follow-up guide on changing the coding for factorial variables would improve this issue.

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Date Created
  • 2017-05