Digital Commons Network^™

When Simulations Conflict: Problems With The External Validation Of Computer Simulations, Archie Fields Iii

Philosophy Theses

I show that Eric Winsberg’s principles of model-building given in Science in the Age of Computer Simulation are insufficient to argue for the external validation of simulation data in cases in which simulation results conflict, and that laboratory experiments have an advantage over simulations because conflicting experimental results can be decided between on the basis of reproducibility. I also argue that robustness of predictions serves the same function for simulations as repeatability does for laboratory experiments in either adjudicating between conflicting results or allowing us to say that we do not have sufficient justification to validate the results. Finally, I …

Enhancing Clinical Reasoning Through Debriefing: Student’S Perceptions, Melanie Smerillo

Master of Arts/Science in Nursing Scholarly Projects

As patients become more complex the role of a nurse requires a higher level of clinical reasoning (IOM, 2010). Simulation in nursing education provides opportunities for nursing students to practice clinical reasoning skills (Jeffries, 2007). Both Kolb’s theory of “Experiential Learning” and Benner’s “Novice to Expert” support the use of simulation in nursing curricula. Kolb’s experiential learning theory is “the process whereby knowledge is created through the transformation of experience and knowledge results from the combination of grasping and transforming experience” (Kolb, 1984, p.41). As novice nurses become experts, they learn better with experiences such as complex patient care scenarios, …

Electronic Medical Record In The Simulation Hospital: Does It Improve Accuracy In Charting Vital Signs, Intake, And Output?, Carel M. Mountain

Doctoral Projects

The introduction of electronic health records has created a shift in the way nursing care is delivered (McBride, Delaney, & Tietze, 2012; Furukawa, Raghu, & Shao, 2010). A factor which heavily influences a nurse’s ability to navigate and utilize EMR is adequate education in the use of computerized documentation (McBride, et al., 2012). There is an increased risk for error at the bedside without the correct knowledge and skills regarding EMR documentation (Kelly, Brandon, & Docherty, 2011). This skill should be introduced during the pre-licensure education of the nurse.

Two groups of associate degree nursing students attending a small community …

Reducing "Failure To Rescue" Occurrences: A Pilot Project Incorporating High-Fidelity Simulation During Mock Codes, To Enhance Pediatric Nurses' Clinical Knowledge And Skills, Denise Dawkins

Doctoral Projects

Thanks to advances in technology, the survival rate of infants and children with critical illnesses has improved. One consequence has been an increase in the acuity levels of hospitalized pediatric patients, which may heighten the risk of in-hospital cardiopulmonary arrest. Patient safety can be compromised by nurses who do not detect subtle clinical changes in a patient's condition, do not perform accurate interventions, or do not apply critical thinking (failure to rescue). The Institute of Medicine (10M) in 1999 estimated that approximately 100,000 people died each year as the result of poor care.

Patients and families place great trust in …

The Expected Value Of An Advantage Blackjack Player, Kamron Jensen

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The following paper takes an in-depth look at the gambling game Blackjack, also known as Twenty-One, and asks the question: If the game is beatable, how much can one expect to win playing Blackjack? This paper starts by explaining how the game is played and continues by telling of how Thorpe (1962) discovered that the game can be beaten. It then goes into detail of how the game has changed over the past 50 years and what it takes to beat the game today. To find the expected value of a winning strategy, I create a computer program to run …

Calculation And Experimental Verification Of Longitudinal Spatial Hole Burning In High-Power Semiconductor Lasers, Ting Hao

Graduate Theses - Physics and Optical Engineering

Longitudinal spatial hole burning (LSHB) is believed to be one of the limiting factors in scaling the output power of high-power semiconductor lasers. In this work, a self-consistent simulation of LSHB was performed to investigate the non-uniform longitudinal photon density distribution, carrier density distribution, and gain distribution in a high-power semiconductor laser. The calculation is based on a modification to the semiconductor laser rate equations and solved using a finite difference approach, with Newton’s method employed to numerically solve the differential equations. The impact of LSHB on output power was analyzed with different parameters, including injection current, cavity length, and …

Strategies To Improve The Efficiency Of Emergency Medical Service (Ems) Systems Under More Realistic Conditions, Kanchala Sudtachat

All Dissertations

Emergency medical service (EMS) systems provide medical care to pre-hospital patients who need rapid response and transportation. This dissertation proposes a new realistic approach for EMS systems in two major focuses: multiple unit dispatching and relocation strategies. This work makes recommendations for multiple-unit dispatch to multiple call priorities based on simulation optimization and heuristics. The objective is to maximize the expected survival rate. Simulation models are proposed to determine the optimization. A heuristic algorithm is developed for large-scale problems. Numerical results show that dispatching while considering call priorities, rather than always dispatching the closest medical units, could improve the effectiveness …

Comparison Of Different Methods For Estimating Log-Normal Means, Qi Tang

Electronic Theses and Dissertations

The log-normal distribution is a popular model in many areas, especially in biostatistics and survival analysis where the data tend to be right skewed. In our research, a total of ten different estimators of log-normal means are compared theoretically. Simulations are done using different values of parameters and sample size. As a result of comparison, ``A degree of freedom adjusted" maximum likelihood estimator and Bayesian estimator under quadratic loss are the best when using the mean square error (MSE) as a criterion. The ten estimators are applied to a real dataset, an environmental study from Naval Construction Battalion Center (NCBC), …

Lateral Dynamics Of Multiple Trailer Trucks In Windy Environments, David Wafer

All Theses

The lateral response of three-trailer commercial vehicles has been assessed using the simulation package TruckSim^TM. Aerodynamic and mechanical characterizations for the vehicle were developed for this investigation. Simulations were carried out with various aerodynamic and load configurations with several different arbitrarily defined crosswinds. The aerodynamic configurations were tested in constant and random crosswinds. The load configurations were tested only in random crosswinds. Each aerodynamic configuration differed by the aerodynamic side-force coefficient for the trailers. Each load configuration consisted of reducing the payload in a single trailer. The tractor was identically defined for each load and aerodynamic configuration. Increasing …

Validation Of A Novel Methodology For Evaluating Surgical Tissue Plane Identification, Syed T. Ali

Electronic Thesis and Dissertation Repository

Introduction: The ability to identify tissues planes is a fundamental surgical skill. This study attempts to validate a previously developed test for assessing this ability.

Methods: 48 video captured images from laparoscopic right hemicolectomies were presented on an iPad to 18 surgeons who were grouped based on experience (Consultants (C), Senior trainees (S), and the Junior trainees (J)). Subjects were asked to draw a line indicating the tissue plane of dissection. Lines were compared by a modified Hausdorff measure. Within group variability represented group precision and trainee accuracy was determined from comparison to Consultants.

Results: Within group comparisons demonstrated Consultants …

Computer Modeling And Simulation Of Implantable Medical Device Heating Due To Mri Gradient Coil Fields, Bryan David Stem

Open Access Theses

For patients with implantable medical devices, the ability to safely undergo MRI scanning is critical to ensuring the highest standard of care. The gradient coils of an MRI generate kilohertz frequency, time varying magnetic fields. These magnetic fields induce a voltage on the external case of metallic, implantable medical devices through electromagnetic induction. Since the magnetic field generated by a gradient coil is time varying, the induced voltage results in the flow of eddy currents which can cause heating effects. These heating effects have been successfully modeled using ANSYS Maxwell and ANSYS Mechanical software packages.

The multi-physics simulation and solution …

M.A.E.G.U.S: Measuring Alternate Energy Generation Via Unity Simulation, Kavin Muhilan Nataraja

Open Access Theses

This paper presents the MAEGUS serious game and a study to determine its efficacy as a pedagogical tool. The MAEGUS serious game teaches sustainable energy concepts through gameplay simulating wind turbines and solar arrays. Players take the role of an energy manager for a city and use realistic data and information visualizations to learn the physical factors of wind and solar energy generation. The MAEGUS serious game study compares game assisted learning to a more traditional teaching method such as reading material in a crossover study, the results of which can inform future serious game development for educational purposes.

Numerical Simulation Of Hydrogen Absorption/Desorption Processes In Cylindrical Metal-Hydrogen Reactors For Hydrogen Storage, Fei Han

Doctoral Dissertations

Hydrogen is one of the best fuels because of its high calorific value and environmental friendliness. However, because of its low density, it has storage problems such as high pressure, large volume requirements, heavy weight and safely risks; this quality prevents its wide usage and commercialization.

Researchers have found that some metal/inter-metallic compounds/alloys, such as Mg, La, LaNi5, ZrV2, Mg2Ni and Ti 2Ni, can react with hydrogen and attain relatively large amounts of hydrogen at a relatively low pressure and near normal temperature. Under certain conditions, hydride can desorb hydrogen quickly. Thus, the metal- hydrogen reaction could be a practical …

Simulation Of An Intake Manifold Pre-Heater For Cold Diesel Engine Startup, Patrick K. Kreun

Masters Theses

Ensuring consistent, reliable diesel engine startups in cold temperatures is of utmost importance in a number of applications. Under extreme temperatures, the use of glow plugs is complemented by intake manifold heaters. In these, the energy released from combustion increases the intake air temperature before the air enters the main combustion chamber. Since the process also alters the stoichiometry of the fuel-air mixture at the intake ports, the preheater operation must be optimized in order to guarantee successful and reliable in-cylinder combustion during engine startups. This paper describes the development of an intake manifold model incorporating an air pre-heater for …

Characterization Of An Impulse Radiating Antenna In The Near Field, Chandra Barjracharya

Electrical & Computer Engineering Theses & Dissertations

The biological effects of intense sub-nanosecond pulses on tissues or cells are in the dielectric domain and not based on thermal loading as in the conventional microwave radiation, which may lead to an entirely new approach of modifying cell functions. Moreover, the resulting cell functional change may be detected with higher resolution by broadband, sub-nanosecond pulses than conventional narrowband systems. The delivery of intense sub-nanosecond pulses to near-field biological tissues, however, has not been studied, not mentioning the focal depth and volume. In this dissertation, for the first time, an impulse radiating antenna with a balanced feed structure is studied …

Comparative Analysis Of Reconstructed Image Quality In A Simulated Chromotomographic Imager, Ryan L. Tervo

Theses and Dissertations

A hyperspectral chromotomographic instrument has been developed to determine the spatial and spectral distribution of a target. It does this by recording the dispersed images produced by a rotating direct vision prism with a high speed camera. The recorded images are processed through a tomographic reconstruction algorithm to produce a reconstructed hypercube. A physics-based system model was developed to investigate three areas. The first was how the prism angle selection and range of angles used impacted the reconstructed image quality. The second was an assessment of a new iterative reconstruction algorithm developed to remove artifacts produced in the Back Projection …

Simulations Of Space Radiation Interactions With Materials, With Application To Dose Estimates For Lunar Shelter And Aboard The International Space Station, Tai Pham

Nuclear Engineering ETDs

This research performed simulations using the state-of-art three dimensional computer codes to investigate the interactions of space radiation with materials and quantify the biological dose onboard the International Space Station (ISS) and in a lunar shelter for future manned missions. High-energy space radiation of Trapped Protons, Solar Particle Events, and GCRs particles interactions are simulated using MCNPX and PHITS probabilistic codes. The energy loss and energy deposition within the shielding materials and in a phantom are calculated. The contributions of secondary particles produced by spallation reactions are identified. Recent experimental measurements of absorbed dose in a phantom aboard the International …

Analyses Of Groundwater Contribution To A Riverine Wetland, Farzad Mahmoodinobar

Dissertations

Rainfall, runoff, overbank flow and groundwater, all contribute water to wetlands. Each transport element is associated with unique modeling approaches and uncertainties. Transpiration is perhaps the hardest to quantify as it is subject to all the variability of plant growth. Transpiration causes land area to lose moisture and the loss amount depends on precipitation incidence, the temperature and type and extent of vegetation. Plants can intercept virtually all recharge during the growing season and almost none from late fall to early spring in northeastern United States. Thus, an improvement in the transpiration element can contribute considerably to an improved groundwater …

Discrete Element Method Based Scale-Up Model For Material Synthesis Using Ball Milling, Priya Radhi Santhanam

Dissertations

Mechanical milling is a widely used technique for powder processing in various areas. In this work, a scale-up model for describing this ball milling process is developed. The thesis is a combination of experimental and modeling efforts.

Initially, Discrete Element Model (DEM) is used to describe energy transfer from milling tools to the milled powder for shaker, planetary, and attritor mills. The rolling and static friction coefficients are determined experimentally. Computations predict a quasi- steady rate of energy dissipation, Ed, for each experimental configuration. It is proposed that the milling dose defined as a product of Ed and milling …

A Program Manager's Dilemma: Measuring The Effect On Performance Of Different Visual Modalities In Mixed Reality Aerial Door Gunnery, Jonathan Stevens

Electronic Theses and Dissertations

The United States Army continues to develop new and effective ways to use simulation for training. One example is the Non-Rated Crew Member Manned Module (NCM3), a simulator designed to train helicopter crewmembers in critical, high risk tasks such as crew coordination, flight, aerial gunnery, hoist and sling load related tasks. The goal of this study was to evaluate visual modalities' effect on performance in mixed reality aerial door gunnery. There is a strong belief in the United States Army that the greater the degree of immersion in a virtual simulation, the more effective that simulation is. However, little scientific …

Secondary World: The Limits Of Ludonarrative, David Dannelly

Electronic Theses and Dissertations

Secondary World: The Limits of Ludonarrative is a series of short narrative animations that are a theoretical treatise on the limitations of western storytelling in video games. The series covers specific topics relating to film theory, game design and art theory: specifically those associated with Gilles Deleuze, Jean Baudrillard, Jay Bolter, Richard Grusin and Andy Clark. The use of imagery, editing and presentation is intended to physically represent an extension of myself and my thinking process and which are united through the common thread of my personal feelings, thoughts and experiences in the digital age.

Effect Of An Experiential Learning Model For Simulation Design On Clinical Nursing Judgment Development In Pre-Licensure Baccalaureate Nursing Students, Joyce Victor Chmil

Electronic Theses and Dissertations

Simulation is an experiential learning process used in nursing education to develop and evaluate competencies, including clinical judgment (Berragan, 2011; Jeffries, 2012), yet the effectiveness of simulation in nursing education is not sufficiently evaluated (Foronda, Liu, & Bauman, 2013) and simulation design is not adequately theory-based (Kaakinen & Arwood, 2009; Rourke, Schmidt, & Garga, 2010; Jeffries, 2012; Rodgers, 2013). In this study, Kolb's Model of Experiential Learning (Kolb, 1984; 1999) was employed to create an experiential learning simulation design. A quasi-experimental study was used to test the effects of this new design on clinical nursing judgment development and its relationship …

Nursing Students' Perceptions Of Mental Health Patients And Mental Health Nursing, Susan Furr

Nursing Theses and Capstone Projects

This Capstone project evaluated the impact of a simulation-based learning experience on nursing students' anxiety levels, preparedness for psychiatric practicum, and stereotypical views towards individuals with mental illness. A sample of 15 bachelor level nursing students was utilized. The experimental group (n=8) was exposed to a four-hour simulation-based learning experience prior to the beginning of their clinical experience. The control group (n=7) began their clinical rotation without any simulation exposure. A pretest, posttest design utilizing the Mental Health Nursing Survey Part 1 (MHN-1) and the Mental Health Nursing Survey Part 2 (MHN-2) was used to measure the students' stereotypical views, …

The Impact Of Structured Debriefing, Following Simulation, On Bsn Student Development Of Clinical Reasoning And Clinical Judgment Skills, Robin Weaver

Electronic Theses and Dissertations

The necessity of appropriate clinical reasoning and clinical judgment skills is recognized as essential for the development of a competent practitioner. In response to the Institute of Medicine (IOM) report which called for a re-evaluation of the educational processes used to prepare practitioners, nursing educators have embraced the use of simulation technology as an innovative approach to enhance student learning. Simulation has been recognized as a vehicle to support student development of knowledge, skills, and attitudes necessary to become a competent practitioner. Recognized in the literature as the most essential element of simulation, debriefing practices vary throughout nursing education. Recently …

Robust Regression Methods For Massively Decayed Intelligence Data, Akiva Joachim Lorenz

Wayne State University Dissertations

Homeland Security, sponsored by governmental initiatives, has become a vibrant academic research field. However, most efforts were placed with the recognition of threats (e.g. theory) and response options. Less effort was placed in the analysis of the collected data through statistical modeling. In a field that collects more than 20 terabyte of information per minute though diverse overt and covert means and indexes it for future research, understanding how different statistical models behave when it comes to massively decayed data is of vital importance.

Using Monte Carlo methods, three regression techniques (ordinary least squares, least-trimmed, and maximum likelihood) were tested …

Thermal And Cooling Systems Modeling Of Powertrain For A Plug -In Parallel-Through-The-Road Hybrid Electric Vehicle, Mengjia Cao

Wayne State University Theses

Thermal modeling and control play an ever increasing role with hybrid electric vehicle (HEV) design and development for improving overall vehicle energy efficiency, and to account for additional thermal loading from electric powertrain components such as electric motor, motor controller and battery pack.

This thesis presents a complete development process for an efficient modeling approach with integrated control strategy for the thermal management of plug-in HEV in a parallel-through-the road (PTTR) architecture, adopted by Wayne State University Hybrid Warriors for their Department of Energy's EcoCAR2 Plugging in to the Future Competition.

The frameworks of this project include simulating the thermal …

Facilitating Student Discussion: The Case Of A Political Scince [Sic] Class, Emma Fitzhugh

Senior Honors Theses and Projects

This case study analyzed four political science simulations in an introductory course with the intent to identify students learning from the simulation and in group collaboration. Though the discussion and collaboration between students surrounds political science topics, the skills students bring into the classroom and acquired during the course can be used in numerous professional fields. The presentation will focus on the scaffolding of assignments and learning that lead up to the classroom simulations. It will also highlight the skills students developed surrounding group collaboration and student's individual conclusions on decision making.

Residual Stress Analysis Of Pipeline Girth Weld Joints, Djarot B. Darmadi

University of Wollongong Thesis Collection 1954-2016

Residual stress is one of the important factors that should be considered when assessing the integrity of welded structures because it is well known that residual stress may lead to failure in the weld joint. Residual stress may lead to stress corrosion cracking in a corrosive environment and has resulted in failures in energy pipelines.

Residual stress and stress corrosion cracking in the region of the girth welded joint in pipelines was investigated in the current work. The emphasis was placed on residual stress modeling in pipeline girth welds since it was judged to be an essential prerequisite for stress …

Identifying Sources Of The Tragedy Of The Commons In Root Competition: A Spatially Explicit Simulation Model And Plants Grown In Transparent Growth Medium, R Deric Leith Miller

Theses and Dissertations--Biology

Existing research shows that plants produce less root when growing alone than when growing in competition with other plants. When plants under root competition over-allocate resources to roots at the cost of reproduction, it represents a Tragedy of the Commons. I constructed simulation models to determine the circumstances likely to give rise to a Tragedy of the Commons, and explore mechanisms by which plants may solve it. I grew plants in nutrient-rich transparent gel, allowing me to quantify root growth and development without destructive sampling. My plants responded positively to additional space and the presence of a competitor at full …

The Innovation Of Simulation Laboratories And The Novice Nurses In The Clinical Setting, Brenda Washington Moore

Walden Dissertations and Doctoral Studies

The push to generate professional nurses has raised questions about the competency level of the novice nurses that are entering the workforce. Utilization of simulation laboratories is being viewed as an option for bridging the gap for the shortage of nurses, nurse educators, and clinical sites. The theory of goal attainment was used to guide this project, which aimed to develop and validate an ER simulation scenario that mimics a clinical setting as a tool for measuring nursing skills. An additional purpose, to be accomplished after graduation, will be to implement a pilot project to determine the impact of the …