Digital Commons Network^™

Mono And Multi-Objective Optimization And Modeling Of Machining Performance In Face Milling Of Ti6al4v Alloy, Al Mazedur Rahman

Theses and Dissertations

Titanium alloys are extensively used in numerous industries like aerospace, automotive, military, etc., due to their exclusive characteristics. But machining these alloys has always been challenging for manufacturers. This research investigates the effect of radial depth of cut on cutting forces, tool life, surface roughness (Ra), and material removal rate (MRR) during face milling of Ti6Al4V alloy. It also aims to perform mono and multi-objective optimization of response characteristics to determine the optimal input parameters, namely cutting speed, feed rate, and radial depth of cut. Taguchi method and analysis of variance (ANOVA) have been used for mono-objective optimization, whereas Taguchi-based …

A Comparative Analysis Of Rule-Based, Model-Agnostic Methods For Explainable Artificial Intelligence, Giulia Vilone, Lucas Rizzo, Luca Longo

Articles

The ultimate goal of Explainable Artificial Intelligence is to build models that possess both high accuracy and degree of explainability. Understanding the inferences of such models can be seen as a process that discloses the relationships between their input and output. These relationships can be represented as a set of inference rules which are usually not explicit within a model. Scholars have proposed several methods for extracting rules from data-driven machine-learned models. However, limited work exists on their comparison. This study proposes a novel comparative approach to evaluate and compare the rulesets produced by four post-hoc rule extractors by employing …

Program Evaluation Of Departmentalizing In Upper Elementary, Pamela Crabb

Dissertations

The purpose of this study was to determine the effectiveness of departmentalization as a strategy at the elementary upper grades to affect gains in the school’s accountability and gains in achievement performance. Based upon standardized testing measures, accountability for student achievement has dramatically increased in elementary schools; rigorous standards have increasingly affected teachers to become highly skilled in subject content areas. This increase in teacher content knowledge expertise requirements have caused many administrators to seek alternative instructional strategies to meet this need. Departmentalization is one of many potential methods that administrators and educators may implement in order to provide expert …

An Evaluation Of One School District Standards Assessment Program, Derrick King

Dissertations

This project focuses on how one school district uses quarterly assessments to identify standards students have not mastered. This project identifies how some schools utilize quarterly assessment data with varying results. One problem I have identified is a lack of a consistent expectation from district leadership, regarding the expectation for how schools should use the assessment program. In my research, I examine two schools that use the assessment program differently. The literature I present reveals how the program can help improve student achievement. The research reveals what is working well, and what is not. In closing, I recommend implementing a …

Leveraging Machine Learning To Identify Quality Issues In The Medicaid Claim Adjudication Process, Cyrus Hoseini

All-Inclusive List of Electronic Theses and Dissertations

Medicaid is the largest health insurance in the U.S. It provides health coverage to over 68 million individuals, costs the nation over $600 billion a year, and subject to improper payments (fraud, waste, and abuse) or inaccurate payments (claim processed erroneously). Medicaid programs partially use Fee-For-Services (FFS) to provide coverage to beneficiaries by adjudicating claims and leveraging traditional inferential statistics to verify the quality of adjudicated claims. These quality methods only provide an interval estimate of the quality errors and are incapable of detecting most claim adjudication errors, potentially millions of dollar opportunity costs. This dissertation studied a method of …

Establishing A Kpis And Initiatives Classifying Model Based On Performance Datasets For A Supply Chain Health System, Jamal Alshanableh

Theses

With the increasing demand for advanced analytics in health care, the digital health department at PwC needs to have an automated process for automating and quantifying the current state of the client on a performance management level in a more effective and quantitative manner in order to generate for the client a common type of deliverables which are usually (KPIs and initiatives). The following research was done and evolved for the purpose of providing a quantitative, smart and analytical solution for current state assessment phase of a project engagement, which is a commonly required phase in most of the management …

The Persistence Of Acid Mine Drainage At An East Texas Coal Mine, Sarah Zagurski

Electronic Theses and Dissertations

The objective of this study was to estimate the time it will take for acid forming materials (pyrite) to be weathered to a state of equilibrium and thus cease to produce acid in ground and surface waters within Oak Hill Mine. This was accomplished using an ex-situ kinetic leaching study incorporating a humidity cell in a controlled laboratory setting. Leaching was conducted on soil cores obtained from the vadose zone at Oak Hill Mine and the humidity cell was used to accelerate oxidation of the pyrite within the cores.

An in-situ field study was also conducted that monitored groundwater conditions …

Stratigraphy, Petrology, Diagenesis, Paleontology, And Depositional Environments Of The Harrisburg Member Of The Kaibab Formation In Northern Arizona And Southern Utah, Zachery T. Case

Electronic Theses and Dissertations

The Kaibab Formation has two members, the Fossil Mountain Member below and the Harrisburg Member above. They were deposited in shallow-marine shelf to restricted coastal settings. Stratigraphically above are the Rock Canyon Conglomerate and the Moenkopi Formation; consisting of the Timpoweap and Lower Red members; which are the only members present in the study area. The Rock Canyon Conglomerate was deposited in depressions and as a regolith. The Timpoweap and Lower Red members were deposited in shallow marine to tidal environments.

Nine stratigraphic units were identified in the Harrisburg Member. Units one, two, three, five, six, seven, and nine are …

Backplane System Design Considerations For Micro Led Displays, Kush Benara

Theses

Display technologies have evolved from the bulky Cathode Ray Tube based displays to the latest lightweight and low power micro-Led (uLED) based flat panel displays. A display system consists of a device technology that either manipulates the incoming light or emits its own light and a controller circuit to control the behavior of these devices. This system makes up the backplane of a display technology. uLEDs due to their small size provide higher resolution and better contrast than all the previous display technologies like the LCDs and the OLEDs. Backplane system design considerations for a uLED flat panel display is …

Beyond Wickedness: Managing Complex Systems And Climate Change, Jonathan M. Gilligan, Michael P. Vandenbergh

Vanderbilt Law Review

This Article examines the argument that climate change is a “super wicked” problem. It concludes that the wicked problem concept is best viewed as a rhetorical device that served a valuable function in arguing against technocratic hubris in the early 1970s but is unhelpful and possibly counterproductive as a tool for modern climate policy analysis. Richard Lazarus improved on this analysis by emphasizing the urgency of a climate response in his characterization of the climate problem as “super wicked.” We suggest another approach based on Charles Lindblom’s “science of muddling through.” The muddling through approach supports the rhetorical points for …

Nonlinear Multigrid Based On Local Spectral Coarsening For Heterogeneous Diffusion Problems, Chak Shing Lee, Francois Hamon, Nicola Castelletto, Panayot S. Vassilevski, Joshua A. White

Mathematics and Statistics Faculty Publications and Presentations

This work develops a nonlinear multigrid method for diffusion problems discretized by cell-centered finite volume methods on general unstructured grids. The multigrid hierarchy is constructed algebraically using aggregation of degrees of freedom and spectral decomposition of reference linear operators associated with the aggregates. For rapid convergence, it is important that the resulting coarse spaces have good approximation properties. In our approach, the approximation quality can be directly improved by including more spectral degrees of freedom in the coarsening process. Further, by exploiting local coarsening and a piecewise-constant approximation when evaluating the nonlinear component, the coarse level problems are assembled and …

Electromagnetic Interference Estimation Via Conditional Neural Processing, Edgar E. Gomez

Theses and Dissertations

The goal of this thesis is to determine the efficacy of employing Machine Learning (ML) to solve Joint Urgent Operational Need (JUON) CC-0575, which aims to develop a Common Operating Picture (COP) of the Global Positioning System (GPS) Electromagnetic Interference (EMI) environment. With the growing popularity of Artificial Neural Networks (ANNs), ML solutions are quickly gaining traction in businesses, academia and government. This in turn allows for problem solutions that were previously inconceivable using the classical programming paradigm. This thesis proposes a method to develop a COP of the battlefield via ANN ingestion of multiple-source signals and sensors. We conduct …

Not A Blank Slate: Information Literacy Misconceptions In First-Year Experience Courses, Michelle Keba, Elizabeth Fairall

Communications in Information Literacy

Information literacy is the primary instructional focus of many librarians. With the development of a core set of information literacy threshold concepts, librarians often strive to impart these concepts to undergraduate students during their years of study. However, when students come to school, they are not blank slates. They arrive with preconceived ideas or misconceptions which can impede this process. In this article, the authors report on the results of focus groups held with first-year students at a private, liberal arts university. During the focus groups, participants were asked to share their perceptions of the misconceptions identified by Hinchliffe et …

Evaluating The Reproducibility Of Physiological Stress Detection Models, Varun Mishra, Sougata Sen, Grace Chen, Tian Hao, Jeffrey Rogers, Ching-Hua Chen, David Kotz

Dartmouth Scholarship

Recent advances in wearable sensor technologies have led to a variety of approaches for detecting physiological stress. Even with over a decade of research in the domain, there still exist many significant challenges, including a near-total lack of reproducibility across studies. Researchers often use some physiological sensors (custom-made or off-the-shelf), conduct a study to collect data, and build machine-learning models to detect stress. There is little effort to test the applicability of the model with similar physiological data collected from different devices, or the efficacy of the model on data collected from different studies, populations, or demographics.

This paper takes …

The Media Industry In Oregon: Incentive And Impact Analysis 2020 Update, Emma Brophy, Peter Hulseman, Northwest Economic Research Center

Northwest Economic Research Center Publications and Reports

Oregon’s media industries have become increasingly well-known over the last several years, thanks in large part to successful feature length films and television series produced in the state. It is widely known that such productions offer visibility, tourism interest, and a boost to local merchants during their visits. More economically important, but less immediately obvious, are the impacts of a home grown industry of professionals and businesses that thrive in regions able to maintain a reliable stream of production activity. Numerous states now offer incentives to visiting media productions, some focused on big-ticket features and visiting series. In Oregon, the …

Neighborhood Air Quality Impact From Construction Site Emissions In Portland, Or, Lyndsey Boyle

Environmental Science and Management Professional Master's Project Reports

Research has shown that diesel particulate matter, including black carbon, is harmful to human health and has climate warming properties. Emissions from off-road engines, specifically construction, are a major source of diesel particulate matter in Portland, OR. There has been little done to manage the impact that construction has on local air quality. This project included a review of recent literature on the health and climate warming effects of particulate matter and black carbon, a modeling study to better understand what the major sources of diesel particulate matter are in Oregon, and a review of current research on construction site …

Wicked Problems, Foolish Decisions: Promoting Sustainability Through Urban Governance In A Complex World Symposium: Governing Wicked Problems, Scott D. Campbell, Moira Zellner

Vanderbilt Law Review

Why do wicked problems often give birth to bad policy choices? Put another way, why do people—in the face of complex social challenges—make misdiagnoses, ineffective decisions, or no decisions at all? Typical answers point to a plethora of suspects: impatience, myopia, political stalemate, narrow-mindedness, fear and risk aversion, hubris, greed, rational self-interest, ignorance, reliance on emotionally appealing but misleading anecdotal stories, misuse of evidence, and misunderstanding of uncertainty.

Amid these divergent explanations, two classes emerge: one lies in the shortcomings and mistakes of the problem solvers, and the other lies in the nature of the problem itself. One stance is …

Governing Wicked Problems, Jb Ruhl, James Salzman

Vanderbilt Law Review

"Wicked problems." It just says it all. Persistent social problems-poverty, food insecurity, climate change, drug addiction, pollution, and the list goes on-seem aptly condemned as wicked. But what makes them wicked, and what are we to do about them?

The concept of wicked problems as something more than a generic description has its origins in the late 1960s. Professor Horst Rittel of the University of California, Berkeley, Architecture Department posed the term in a seminar to describe "that class of social system problems which are ill-formulated, where the information is confusing, where there are many clients and decision makers with …

Resilience Theory And Wicked Problems, Robin Kundis Craig

Vanderbilt Law Review

This Article posits, first, that resilience theory offers important insights into our understanding of wicked problems and, second, that to understand the value of resilience theory to wicked problems, we should start by going back to the context of Rittel’s and Webber’s 1973 delineation of the ten characteristics of a “wicked problem.” Rittel and Webber were in fact among the vanguard of researchers beginning to articulate the realization that social and ecological systems—now social-ecological systems (“SESs”)—do not follow the predictable and mechanistic rules of Newtonian physics. As a result, SESs do not yield, at least not over the long term, …

Nebraska School Gardens And The Potential For Science, Technology, Engineering, And Math Learning, Erin Ingram, Jenny Keshwani

Journal of Extension

School-based growing spaces support student engagement in science, technology, engineering, and mathematics (STEM) learning through authentic agricultural pursuits. We conducted a survey of Nebraska schools to characterize existing school-based growing spaces and to identify challenges limiting garden-based STEM learning. Our findings confirm the use of school-based growing spaces for kindergarten through 12th-grade STEM instruction, especially in the sciences. Opportunities for technology and engineering experiences are currently limited, and additional professional development support is needed to broaden garden-based STEM learning efforts. Our findings are relevant to current and future Extension efforts supporting school gardens, especially in rural agricultural communities.

Exploring The Potential Of Defeasible Argumentation For Quantitative Inferences In Real-World Contexts: An Assessment Of Computational Trust, Lucas Rizzo, Pierpaolo Dondio, Luca Longo

Articles

Argumentation has recently shown appealing properties for inference under uncertainty and conflicting knowledge. However, there is a lack of studies focused on the examination of its capacity of exploiting real-world knowledge bases for performing quantitative, case-by-case inferences. This study performs an analysis of the inferential capacity of a set of argument-based models, designed by a human reasoner, for the problem of trust assessment. Precisely, these models are exploited using data from Wikipedia, and are aimed at inferring the trustworthiness of its editors. A comparison against non-deductive approaches revealed that these models were superior according to values inferred to recognised trustworthy …

Adventuring In The Winds: An Exploration Of Water Accessibility, Keystone Species, Environmental Justice, And Forest Fires In The Wind River Range, Rhianna Giron

Honors Program: Senior Projects (Public)

This thesis is a braided narrative that incorporates personal experience, ecological research, and poetry to explain some of the impacts of human interaction in wild spaces and of climate change. The specific areas of study in this essay are the Wind River Range, Wyoming and Nebraska. The purpose of this paper is to discuss topics related to water availability and quality, forest fires, keystone species, and social injustices related to people and environments in the Wind River Range. It is important to learn about other places than the ones we are already familiar with as it helps to instill a …

Quantification Of Nitric Oxide Via Single-Walled Carbon Nanotubes, Jakob Meier

Department of Agricultural and Biological Systems Engineering: Dissertations, Theses, and Student Research

Nitric oxide (NO), a free radical present in biological systems, can have many beneficial and detrimental effects on the body. Due to NO’s short half-life, its detection and quantification is difficult. This inability to quantify NO has hindered researchers that are trying to understand NO’s impact in healthy and diseased conditions. Single-walled carbon nanotubes (SWNT), can become selective to various analytes when wrapped in specific single-stranded DNA strands. The presence of the analyte of interest can change the wavelength and/or intensity of the SWNT’s fluorescence, allowing the SWNT to be used as a sensor. One type of SWNT sensor, 6,5 …

Structure, Neutrostructure, And Antistructure In Science, Florentin Smarandache

Branch Mathematics and Statistics Faculty and Staff Publications

In any science, a classical Theorem, defined on a given space, is a statement that is 100% true (i.e. true for all elements of the space). To prove that a classical theorem is false, it is sufficient to get a single counter-example where the statement is false. Therefore, the classical sciences do not leave room for partial truth of a theorem (or a statement). But, in our world and in our everyday life, we have many more examples of statements that are only partially true, than statements that are totally true. The NeutroTheorem and AntiTheorem are generalizations and alternatives of …

Women In Beekeeping: Impacts Of A Beekeeper Educational Program, Bridget Gross

Department of Entomology: Dissertations, Theses, and Student Research

The decline in honey bee populations over the past two decades in the United States is alarming. The management provided by beekeepers to their honey bee colonies influences the survival of the colony. However, there is a lack of information on the experiences of beekeepers, specifically women beekeepers. The Center for Rural Affairs (CFRA) in Nebraska hosted the “Honey Bees on the Farm: Connecting Women Beekeepers and Women Farmers for Environmental and Economic Benefit” program that provided informal, educational events to women beekeepers and landowners. Using a convergent mixed methods design, the first research question examines the impacts of the …

A Management Strategy Evaluation Of The Impacts Of Interspecific Competition And Recreational Fishery Dynamics On Vermilion Snapper (Rhomboplites Aurorubens) In The Gulf Of Mexico, Megumi C. Oshima

Dissertations

In the Gulf of Mexico (GOM), Vermilion Snapper (Rhomboplites auroruben), are believed to compete with Red Snapper directly for prey and habitat. The two species share similar diets and have significant spatial overlap in the Gulf. Red Snapper are thought to be the dominate competitor, forcing Vermilion Snapper to feed on less nutritious prey when local resources are depleted. In addition to ecological pressures, GOM Vermilion Snapper support substantial commercial and recreational fisheries. Over the past decade, recreational landings have steadily increased, reaching a historical high in 2018. One cause may be stricter regulations for similar target species such as …

Permanent Pressure Drop Measurements In Converging-Diverging Plain Annuli., A. Bastawissi

Mansoura Engineering Journal

This paper presents the results of a series of experiments on the measurements of pressure losses for turbulent water flow (Re>10,000) in convergent divergent plain annuli. Depending upon the convergence angle and the divergence angle four different annuli were studied. From, these experiments, generalized empirical correlations were deduced to describe pressure losses for turbulent water flow in the convergent portion, in the divergent portion and in the whole annuli. These correlate the experimental data within ± 4%. In general pressure losses for convergent-divergent plain annuli were found to be functions of both the convergence angle and the divergence angle. …

A Narrative Review Of Early Surgery Versus Conventional Treatment For Infective Endocarditis: Do We Have An Answer?, Umberto Benedetto, Cristiano Spadaccio, Federico Gentile, Marc R. Moon, Francesco Nappi

Open Access Publications

The most appropriate strategy and timing for surgery in infective endocarditis (IE) remains an argument of debate. Despite some authors promote the adoption of an early surgical approach (within 48 hours) to limit mortality and complications, no robust randomized trials are available on this argument and the evidence on this subject remain at the "expert opinion" level. Additionally, the different messages promulgated by the American and European guidelines contributed to fuel confusion regarding the relative priority of the surgical over medical therapy in IE. The European Society of Cardiology (ESC) guidelines individuates three level of urgency: emergency surgery, to be …

The Acoustics Of The “Clapping Circle” At Purdue University, Elspeth A. Wing, Steven J. Herr, Alexander D. Petty, Alexander K. Dufour, Frederick H. Hoham, Morgan E. Merrill, Donovan W. Samphier, Weimin Thor, Kushagra Singh, Yutong Xue, Davin H. Huston, J Stuart Bolton

Publications of the Ray W. Herrick Laboratories

The unusual acoustical properties of a particular landscape architecture feature of Academy Park on the Purdue University campus have been the subject of speculation for years. The feature, known informally as the “clapping circle,” consists of sixty-six concentric rings of stone tiles. When someone claps while standing at the middle of the circle, they hear a high-pitched squeak immediately afterwards. Experiments were conducted by the Purdue student chapters of the Acoustical Society of America and the Audio Engineering Society to characterize this effect. The response to a clap played from an omnidirectional speaker placed at the center of the circle …

The Uniform Soybean Tests: Northern Region 2020, Guohong Cai, Adam Brock

Uniform Soybean Tests Northern Region

The purpose of The Uniform Soybean Tests is to critically evaluate the best of the experimental soybean lines developed by federal and state research personnel in the U.S. and Canada, for their potential release as new varieties. A test is established for each of ten maturity groups. Uniform Test 00 includes maturity Group 00 strains adapted to production in the northern fringe of the present area of soybean production. Uniform Tests 0 through IV include later maturing strains adapted to locations progressively further south in the North Central States and areas of similar latitude. Each year new selections are added …