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Articles 1351 - 1380 of 31309
Full-Text Articles in Entire DC Network
Data Discovery Analysis On Complex Time Series Data, Peter Lawrence Severynen
Data Discovery Analysis On Complex Time Series Data, Peter Lawrence Severynen
Computer Science and Engineering Theses - Archive
Complex time series are a ubiquitous form of data in the modern world. They have wide application across many different fields of scientific inquiry and business endeavor. Time series are used to understand and forecast weather patterns, voting patterns, computer network traffic, population health outcomes, demographic changes, the results of scientific experiments, and the performance of stocks and mutual funds. But time series can be difficult to analyze by conventional methods when the data is multivariate, incomplete, or in different formats. To address these issues, an investigation of several multivariate time series datasets was performed using the methods of automatic …
Robust Synthesis Methods For Cooperative Systems, Baris Taner
Robust Synthesis Methods For Cooperative Systems, Baris Taner
Mechanical and Aerospace Engineering Dissertations - Archive
Cooperative systems, like any other dynamic systems, suffer in performance because of uncertainty yet there is an added layer of uncertainty due to the communication among agents. Therefore, analytic solution to these problems are hard if not impossible. With the advancements in the linear and non-linear methods, i.e. linear matrix inequalities (LMI) and non-linear transformations, robust performance analysis and controller synthesis for cooperative systems can be reformulated as optimization problems with LMI constraints as has been done in the last two decades. Another aspect of the problem becomes visible as the cooperative system grows larger and that necessitates faster solution …
Effect Of Centrifugal Force On The Load Capacity Of Thrust Gas Bearing, Rakan Mohammed Haidar
Effect Of Centrifugal Force On The Load Capacity Of Thrust Gas Bearing, Rakan Mohammed Haidar
Mechanical and Aerospace Engineering Theses - Archive
It has been known for many decades that both rigid and foil thrust bearings are two options in the market for high-speed turbomachinery systems. Their advantages encompass the lower manufacturing cost, the lighter weight, and the flexibility in allowing “component misalignment and runout.” When the operating fluid is air, the classical lubrication theory works perfectly. Any additional terms of the inertia effect might be somehow less significant and sometimes negligible since the viscous forces will be dominant, but this may not be the case if the bearing operates in a harsh environment, such as a high-pressure environment. Nonetheless, this is …
Physical Modeling Of Filament Growth And Resistive Switching In Metal Oxide-Based Rram, Kena Zhang
Physical Modeling Of Filament Growth And Resistive Switching In Metal Oxide-Based Rram, Kena Zhang
Material Science and Engineering Dissertations - Archive
Metal oxide-based resistive random-access memories (RRAM) exhibit several excellent performances, such as nanosecond switching speed, large write-erase endurance, and long retention time, and can potentially replace the traditional circuit elements for use as the fundamental units in next-generation hardware deep-learning or neuromorphic systems. The functionality of a metal oxide-based RRAM is attributed to an oxygen vacancy (V_O^(..))-rich conductive filament (CF), which initially forms, and later dissolves or regrows inside the oxide layer during the resistive switching process. However, the complicated interplays among the coexisting chemical, electrical, mechanical, and thermal effects during the formation, growth, and rupture of the CFs make …
Development Of A Decesion Tree To Rehabilitate Or Replace The St. Francis Bridge Over Ih-30, Md Farhan Abir
Development Of A Decesion Tree To Rehabilitate Or Replace The St. Francis Bridge Over Ih-30, Md Farhan Abir
Civil Engineering Theses - Archive
ABSTRACT: The ASCE infrastructure report card indicated that about 42% of the nation’s bridges are over 50 years old, and 7.5% of the bridges are structurally deficient. The 61-year-old St. Francis bridge over IH-30 is one of the Texas Department of Transportation (TxDOT) bridges that exhibit significant deterioration in the superstructure, including potholes and delamination in the deck. The bridge was load posted to 28,000 lb. limit and has substandard vertical and horizontal clearances to the bottom chord of the beams and supporting piers, respectively, which creates a high risk for vehicle impact. In 2017, an over-height truck struck the …
Study Of The Impact Of Atmospheric Variability On Subsurface Methane Emissions: Application To Leak Detection And Quantification For Underground Natural Gas Pipeline Leaks, Shanru Tian
Civil Engineering Dissertations - Archive
Natural gas (NG), taken as a bridging fuel for achieving a low-carbon future, has rapidly grown to be a significant component of the global energy system and requires extensive pipeline infrastructures, most of them buried underground. Fugitive methane (CH4) emissions from NG pipeline leaks pose environmental, safety, and economic threats to the public. An effective leak detection and quantification (LDAQ) survey method is critical to identifying a leak and assessing the size when it has occurred, thus initiating appropriate response actions to repair it and accounting for the environmental risks accurately. However, gaps exist between LDAQ survey methods, and the …
An Ai-Based Framework For Studying Visual Diversity Of Urban Neighborhoods And Its Relationship With Socio-Demographic Variables, Md Amiruzzaman, Ye Zhao, Stefanie Amiruzzaman, Aryn C. Karpinski, Tsung Heng Wu
An Ai-Based Framework For Studying Visual Diversity Of Urban Neighborhoods And Its Relationship With Socio-Demographic Variables, Md Amiruzzaman, Ye Zhao, Stefanie Amiruzzaman, Aryn C. Karpinski, Tsung Heng Wu
Computer Science Faculty Publications
This study presents a framework to study quantitatively geographical visual diversities of urban neighborhood from a large collection of street-view images using an Artificial Intelligence (AI)-based image segmentation technique. A variety of diversity indices are computed from the extracted visual semantics. They are utilized to discover the relationships between urban visual appearance and socio-demographic variables. This study also validates the reliability of the method with human evaluators. The methodology and results obtained from this study can potentially be used to study urban features, locate houses, establish services, and better operate municipalities.
A Global Building Occupant Behavior Database, B Dong, Y Liu, W Mu
A Global Building Occupant Behavior Database, B Dong, Y Liu, W Mu
School of Art, Design and Architecture
This paper introduces a database of 34 field-measured building occupant behavior datasets collected from 15 countries and 39 institutions across 10 climatic zones covering various building types in both commercial and residential sectors. This is a comprehensive global database about building occupant behavior. The database includes occupancy patterns (i.e., presence and people count) and occupant behaviors (i.e., interactions with devices, equipment, and technical systems in buildings). Brick schema models were developed to represent sensor and room metadata information. The database is publicly available, and a website was created for the public to access, query, and download specific datasets or the …
Forest Structure And Composition Alleviate Human Thermal Stress, Loïc Gillerot, Dries Landuyt, Rachel Oh, Winston T. L. Chow, Et Al
Forest Structure And Composition Alleviate Human Thermal Stress, Loïc Gillerot, Dries Landuyt, Rachel Oh, Winston T. L. Chow, Et Al
Research Collection College of Integrative Studies
Current climate change aggravates human health hazards posed by heat stress. Forests can locally mitigate this by acting as strong thermal buffers, yet potential mediation by forest ecological characteristics remains underexplored. We report over 14 months of hourly microclimate data from 131 forest plots across four European countries and compare these to open-field controls using physiologically equivalent temperature (PET) to reflect human thermal perception. Forests slightly tempered cold extremes, but the strongest buffering occurred under very hot conditions (PET >35°C), where forests reduced strong to extreme heat stress day occurrence by 84.1%. Mature forests cooled the microclimate by 12.1 to …
Heat And Colonial Weather Science In The Straits Settlements C. 1820-1900, Fiona Williamson
Heat And Colonial Weather Science In The Straits Settlements C. 1820-1900, Fiona Williamson
Research Collection College of Integrative Studies
Historical explorations of tropical heat in a colonial context have largely focussed on two interconnected spheres: colonial perceptions of place and body or, the implications of heat on different bodies in medical thought and practice. This paper seeks to move the discussion towards a history of colonial scientific thought about heat as component of weather and of escalating nature-induced hazards, studied in the observatory or meteorological department. A central theme is to think about heat in its relationship to nascent meso-scale atmospheric knowledge, meteorological theory and, as a by-product of urbanisation and land-use change. In so doing, it conceptualises the …
The Evolution Of X-Ray Binaries And Their Accretion States, Lacey A. West
The Evolution Of X-Ray Binaries And Their Accretion States, Lacey A. West
Graduate Theses and Dissertations
X-ray binary systems (XRBs) consist of a compact object component (e.g., black hole or neutron star) that accretes matter from a companion star. Although the extent to which XRBs contributed to the early heating of the intergalactic medium is still under investigation, it is estimated that XRBs dominated the X-ray radiation field before the reionization epoch. The study of XRB emission is therefore crucial to our understanding of the very early universe. Furthermore, studying the abundance and radial distribution of each XRB type within a galaxy can be revealing of the host galaxy’s local properties, structure, and evolution. XRB spectra …
Movie Reviews Sentiment Analysis Using Bert, Gibson Nkhata
Movie Reviews Sentiment Analysis Using Bert, Gibson Nkhata
Graduate Theses and Dissertations
Sentiment analysis (SA) or opinion mining is analysis of emotions and opinions from texts. It is one of the active research areas in Natural Language Processing (NLP). Various approaches have been deployed in the literature to address the problem. These techniques devise complex and sophisticated frameworks in order to attain optimal accuracy with their focus on polarity classification or binary classification. In this paper, we aim to fine-tune BERT in a simple but robust approach for movie reviews sentiment analysis to provide better accuracy than state-of-the-art (SOTA) methods. We start by conducting sentiment classification for every review, followed by computing …
A Multi-Criteria Ranking System For Prioritizing Maintenance Of Levee Systems In Arkansas, Nguyen Danh Phan
A Multi-Criteria Ranking System For Prioritizing Maintenance Of Levee Systems In Arkansas, Nguyen Danh Phan
Graduate Theses and Dissertations
There are 208,009 properties in Arkansas that have more than a 26% chance of being severely affected by flooding over the next 30 years, which represents 13% of all properties in the state. A levee system is designed to reduce the flooding risk for urban and rural communities; however, most of the state's levees have been significantly outdated or built with engineering standards less rigorous than current best practices. The Levee Safety Action Classification (LSAC), as recorded in the National Levee Database (NLD), communicates the risk associated with living behind a particular levee and assists local, state, and federal stakeholders …
A Framework For Assessing The 4th Rank Dispersivity Tensor Under Anisotropic Axial Symmetries, Xiang Fan
A Framework For Assessing The 4th Rank Dispersivity Tensor Under Anisotropic Axial Symmetries, Xiang Fan
Dissertations
Multi-dimensional expansion of the advection-dispersion equation necessitated the representation of dispersivity as a 4th rank tensor. This tensorial form of dispersivity has 81 terms in three-dimensions with a maximum of 36 independent terms that may be used to describe Fickian spreading of a dissolved contaminant plume according to intrinsic properties of a porous medium. The complexity of the 4th rank tensor has led to the common practice of simplifying the tensor to only 2 or 3 independent terms by assuming isotropic conditions, although isotropic porous media are uncommon in nature as many natural geologic systems exhibit pronounced anisotropy. A broad …
A Qualitative Approach To Understanding The Career Perceptions And Choices Of Stem Undergraduate And Graduate Students, Jennifer M. Ribble
A Qualitative Approach To Understanding The Career Perceptions And Choices Of Stem Undergraduate And Graduate Students, Jennifer M. Ribble
Dissertations
In order to remain competitive in the global economy, there has been a call to increase recruitment and retention in science, technology, engineering, and mathematics (STEM) careers in the United States (National Science Board, 2014, 2016; President's Council of Advisors on Science and Technology, 2012). In addition to increasing the number of individuals in these fields, it is also imperative to increase the diversity of the individuals filling STEM positions. Not only is it a moral responsibility to create STEM environments that are more inclusive of those who have been historically marginalized in STEM settings, but it is critical in …
Factors That Influence High School Students' Postsecondary Career Decisions In A Guaranteed-Tuition Based School District, Tracy Y. Miller
Factors That Influence High School Students' Postsecondary Career Decisions In A Guaranteed-Tuition Based School District, Tracy Y. Miller
Dissertations
This study explored factors that influence the postsecondary career decisions of 427 11th and 12th grade students in a guaranteed tuition-based school district in a Midwestern state. Since 2005, this district has had a “Promise” program where eligible students can get up to 100% of their postsecondary tuition paid to attend a college, university, technical, or skilled trade program, or participate in an apprenticeship. Students have up to 10 years after graduating high school to utilize the funding. In addition, students who decide to enter the military after high school have up to 10 years to utilize the funding after …
Coresets For Vertical Federated Learning: Regularized Linear Regression And K-Means Clustering, Lingxiao Huang, Zhize Li, Jialin Sun, Haoyu Zhao
Coresets For Vertical Federated Learning: Regularized Linear Regression And K-Means Clustering, Lingxiao Huang, Zhize Li, Jialin Sun, Haoyu Zhao
Research Collection School Of Computing and Information Systems
Vertical federated learning (VFL), where data features are stored in multiple parties distributively, is an important area in machine learning. However, the communication complexity for VFL is typically very high. In this paper, we propose a unified framework by constructing coresets in a distributed fashion for communication-efficient VFL. We study two important learning tasks in the VFL setting: regularized linear regression and $k$-means clustering, and apply our coreset framework to both problems. We theoretically show that using coresets can drastically alleviate the communication complexity, while nearly maintain the solution quality. Numerical experiments are conducted to corroborate our theoretical findings.
Don’T Judge A Book By Its Covr: Learning And Training In Virtual Reality; The Effects Of Two Levels Of Immersion, Kendall Carmody, Meredith Carroll
Don’T Judge A Book By Its Covr: Learning And Training In Virtual Reality; The Effects Of Two Levels Of Immersion, Kendall Carmody, Meredith Carroll
Aeronautics Faculty Publications
Immersive devices, such as virtual reality (VR) devices are swiftly being integrated into military and civil operations as advanced tools for training, with studies observing the beneficial aspects of employing these devices for training cognitive skills (Xie et al., 2021). However, further research is needed to understand specific characteristics of the learning effectiveness of the technology and identify which levels of immersion benefit specific learning constructs in training. This study examined the effect of immersion on four constructs related to learning, including memory retention, learner engagement, learning performance in the form of knowledge acquisition, and perceived learning in a virtual …
A Study Of The Structural, Optical, And Ferroelectric Characteristics Of Pb-Ge-Te Nanocrystalline Alloys As Potential Candidates For Memory Devices And Near-Infrared (Nir) Applications, Asmaa Elkhodary, Salah M. Elsheikh, Hosny A. Omar, Manal A. Mahdy, Iman A. Mahdy
A Study Of The Structural, Optical, And Ferroelectric Characteristics Of Pb-Ge-Te Nanocrystalline Alloys As Potential Candidates For Memory Devices And Near-Infrared (Nir) Applications, Asmaa Elkhodary, Salah M. Elsheikh, Hosny A. Omar, Manal A. Mahdy, Iman A. Mahdy
Basic Science Engineering
Pb50-xGexTe50 (x = 15, 20, 25, 30 at. %) nanocrystalline bulk alloys were prepared using solid-state direct reaction. X-ray diffraction and high-resolution transmission electron microscopy (HR-TEM) analysis of the reference structure (Ge = 15 at.%) revealed a slightly distorted cubic structure, with a lattice parameter of 6.43 Å and an inter-axis unit cell angle of 88.69◦. Atomic force images’ analysis and histograms displayed a homogenous particle size distribution in the nanoscale for all samples. Density measurements showed a gradual decrease from 7.89 to 6.98 g/cm3 with increasing Ge content in agreement with the calculated values. …
Student And Teacher Perspectives On Asynchronous Learning During The Covid Pandemic, Michele Ehrhart
Student And Teacher Perspectives On Asynchronous Learning During The Covid Pandemic, Michele Ehrhart
Education Doctorate Dissertations
The COVID Pandemic shut down schools across the country, leaving K-12 schools unprepared for virtual learning. In this mixed methods study, I examined data gathered from my 8th-grade science classes to assess the effectiveness of asynchronous instruction. My original research question was: How much if at all, did learning outcomes differ as a function of how the lessons were taught (uninterrupted instructional video versus interrupted/interactive Edpuzzle video)? Based on a preliminary examination of data, my study expanded into how self-regulated learning affected students’ comprehension, interest, and motivation. Study results showed no statistical differences in students’ comprehension based on how lessons …
Relevance Of The Obstacles To The Achievement Of Food Sovereignty In Ecuador, Analysis Through The Neutrosophic Soft Set, Tannia Cristina Poveda Morales, Silvia Elizabeth Bonilla Veloz, Diego Armando Freire Muñoz
Relevance Of The Obstacles To The Achievement Of Food Sovereignty In Ecuador, Analysis Through The Neutrosophic Soft Set, Tannia Cristina Poveda Morales, Silvia Elizabeth Bonilla Veloz, Diego Armando Freire Muñoz
Neutrosophic Sets and Systems
No abstract provided.
Bridgewater Review, Vol. 40, No. 2, December 2022
Bridgewater Review, Vol. 40, No. 2, December 2022
Bridgewater Review
No abstract provided.
Perceived Quality Of Senior Care In An Assisted Living Facility Following The Outbreak Of Covid-19, Kaylie Hill
Perceived Quality Of Senior Care In An Assisted Living Facility Following The Outbreak Of Covid-19, Kaylie Hill
Theses/Capstones/Creative Projects
The COVID-19 pandemic has posed a monumental obstacle to the healthcare field in terms of severely reducing the number of healthcare workers. Among the many industries affected by staffing shortages are assisted living facilities (ALFs), in which residents are dependent on care staff for daily assistance. This study sought to investigate whether long-term residents of ALFs perceive a difference in the quality of their care under the circumstances of the pandemic as opposed to those of pre-pandemic times. Semi-structured interviews were facilitated with 10 long-term residents who have been residing in an Omaha ALF since prior to the outbreak of …
Philosophers Of Catastrophe: Early 20th Century Jewish Proponents And Opponents Of Objectivity In Science, Steven Gimbel, Stephen J. Stern
Philosophers Of Catastrophe: Early 20th Century Jewish Proponents And Opponents Of Objectivity In Science, Steven Gimbel, Stephen J. Stern
Philosophy Faculty Publications
The Second World War ended with the exposure of the Nazi death camps and the threat of global nuclear annihilation. The former disclosed the depths of human depravity and the latter warned us about the severity of the consequences that could await us as a result. The grimness of each, much less both, had the effect of shielding from our collective consciousness the equally dire warnings from the First World War that had occurred only a couple of decades earlier. [excerpt]
Workshops Report For Mesophotic And Deep Benthic Community Fish, Mobile Invertebrates, Sessile Invertebrates And Infauna, Rachel Bassett, Stacey L. Harter, Randy Clark, Ian Zink, Katherine Hornick, Jennifer Hart, Hanna Bliska, Melissa Carle, Tracey Sutton, Amanda Demopoulos, Andy David, Kristopher Benson, Jill Bourque, Martha Nizinski, Nancy Prouty, Stephanie Sharuga, Alicia Caporaso, Jennifer Le, Jennifer Herting, Cheryl Morrison, Matthew Poti
Workshops Report For Mesophotic And Deep Benthic Community Fish, Mobile Invertebrates, Sessile Invertebrates And Infauna, Rachel Bassett, Stacey L. Harter, Randy Clark, Ian Zink, Katherine Hornick, Jennifer Hart, Hanna Bliska, Melissa Carle, Tracey Sutton, Amanda Demopoulos, Andy David, Kristopher Benson, Jill Bourque, Martha Nizinski, Nancy Prouty, Stephanie Sharuga, Alicia Caporaso, Jennifer Le, Jennifer Herting, Cheryl Morrison, Matthew Poti
Marine & Environmental Sciences Faculty Reports
Two workshops with subject matter experts in the appropriate fields, were held in November and December 2021 to elicit guidance and feedback from the broader mesophotic and deep benthic scientific community. These workshops focused on best practices/approaches and identifying data gaps relative to habitat assessment and evaluation goals of the Mesophotic and Deep Benthic Community (MDBC) restoration portfolio. The first workshop was a combined effort of the Habitat Assessment and Evaluation (HAE) Project Team and the Deepwater Horizon (DWH) Program. Industrial Economics, Inc. (IEc) provided extensive workshop planning, organizing, execution, and facilitation support during all stages of the workshop. Based …
Criminal Protection Of Copyright. Analysis From The Work And Professional Experience Of Its Actors, Rosa Evelyn Chuga Quemac, Luis Fernando Piñas Piñas, Cynthia Paulina Cisneros Zúñiga, Edison Joselito Naranjo Luzuriaga
Criminal Protection Of Copyright. Analysis From The Work And Professional Experience Of Its Actors, Rosa Evelyn Chuga Quemac, Luis Fernando Piñas Piñas, Cynthia Paulina Cisneros Zúñiga, Edison Joselito Naranjo Luzuriaga
Neutrosophic Sets and Systems
No abstract provided.
Mysteerio: Multi-Regional Environmentally Extended Input-Output Model For United States, Yash Srivastava
Mysteerio: Multi-Regional Environmentally Extended Input-Output Model For United States, Yash Srivastava
All Theses
This research work titled My State Environmentally Extended Regional Input-Output (MYSTEERIO) is based on the concept of multi-regional environmentally extended input-output (MREEIO), which is a combination of lifecycle thinking and economics principles. Numerous studies have highlighted the advantages of using this methodology to determine the environmental impacts associated with economic activities for a region. However, no prior attempt has been made to conduct a state-level analysis for the US. This research work thus tries to estimate the impacts embodied due to the consumption of goods and services at the state level by using the MREEIO principles. Extensive coverage of the …
Algebraic Reasoning And Conceptual Understanding: A Mixed Methods Comparison Of In-Person And Virtual Classroom Strategies, Erneice J. Jackson
Algebraic Reasoning And Conceptual Understanding: A Mixed Methods Comparison Of In-Person And Virtual Classroom Strategies, Erneice J. Jackson
Dissertations
Algebraic reasoning is the beginning school of thought to critical thinking. Employers are looking for this 21st century skill. The purpose of this research was to investigate equity in mathematics education using the NCTM Teaching and Learnings Beliefs Survey. Four area were studied: the number of years in education, the degree earned, the grade level taught in education, and the number of years in an educator’s teaching position. A mixed methods inventory was used. Most results were not rejected in this study. Two statements in the survey warranted a discussion. Recommendations were made for further research.
Study Of The Ai-Feynman Package, Parvat Sapkota
Study Of The Ai-Feynman Package, Parvat Sapkota
2022 Fall Honors Capstone Projects - Archive
At a particular point during the scientific process, we need to understand the relationships between different variables. In science, generally, the relationships are derived using the first principle. Developing another way to determine the relationship among variables of a physical system will help to boost not only overall scientific research but may also aid greatly in the scientific discovery process. Symbolic regression, which is a process of discovering a symbolic expression to describe the given data, can be used to determine relationships between variables. However, the problem with symbolic regression is that we have to go through many combinations before …
Senstive Enantiomeric Analysis Of N-Acyl Homoserine Lactones In Bacterial Matrices, Abiud E. Portillo
Senstive Enantiomeric Analysis Of N-Acyl Homoserine Lactones In Bacterial Matrices, Abiud E. Portillo
Chemistry & Biochemistry Dissertations - Archive
Communication between unicellular organism has long been studied with many facets yet to be discovered. A specific type of communication in gram-negative bacteria is quorum sensing (QS). N-acyl homoserine lactones (N-HLs) are the molecular signals in this process. At a critical concentration of N-HLs, all bacteria of the same population stop behaving like individuals and in a concerted manner induce a specific gene expression which ultimately benefits the entire population in major. This phenomenon has been coined with the term quorum sensing with the main signaling molecules dubbed L-N-acyl homoserine lactones (L-N-HL). Quorum sensing signaling pathways have their influence in …