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Estimation Of Parameters Of Gamma And Generalized Gamma Distributions Based On Censored Experimental Data, Xiangwen Shang

Statistical Science Theses and Dissertations

In time-to-event data analysis, censoring is one of the unique features that restricts our ability to observe the time-to-events and poses difficulties for statistical analysis. Censoring occurs when the exact time-to-event cannot be observed for some or all observations. In this thesis, we study the parameter estimation methods for a two-parameter gamma distribution and a three-parameter generalized gamma distribution based on different kinds of censored data arising from life-testing experiments.

We first study the parameter estimation of a three-parameter generalized gamma distribution based on left-truncated and right-censored data. It is well known that the maximum likelihood estimates of the parameters …

Quantifying Hydrologic Pathway And Source Connectivity Dynamics In Tile Drainage: Implications For Phosphorus Concentrations, Saeid Nazari, William I. Ford, Kevin W. King

Biosystems and Agricultural Engineering Faculty Publications

Flowpathways and source water connectivity dynamics are widely recognized to affect tile-drainage water quality. In this study, we developed and evaluated a framework that couples event-based hydrograph recession and specific conductance end-member mixing analysis (SC-EMMA) to provide a more robust framework for quantifying both flow pathway dynamics and source connectivity of drainage water in tile-drained landscapes. High-frequency (30-min) flow and conductivity data were collected from an edge-of-field tile main located in northwestern Ohio, and the newly developed framework was applied for data collected in water year 2019. Multiple linear regression (MLR) analysis was used to evaluate the impact of pathway-connectivity …

The Impact Of Innovation In The New Era Of Space Exploration, Seetha Raghavan

UCF Forum

Every once in a while, a confluence of discoveries, events and initiatives results in a breakthrough so significant that it propels the entire world to a higher level, redefining what is possible in so many different fields. This breakthrough is taking centerstage now, as the new era of space exploration — catalyzed by increasing launch access — dawns upon us. The surge of innovation that comes with this will create new opportunities and inspire the next generation of doers. When this happens, boundaries between scientific and social impact are blurred. Innovation leading to scientific discovery can benefit society in the …

Evaluating Mine Design Alternatives For Social Risks Using Discrete Choice Analysis, Kwame Awuah-Offei, Sisi Que, Atta Ur Rehman

Mining Engineering Faculty Research & Creative Works

As with other engineering design tasks, mine design involves setting design objectives and constraints (the feasible solution space) and finding the optimal design alternative. Mine engineers often struggle to incorporate the preferences of local community members into their evaluation of mine design alternatives because the mining literature lacks tools to quantify such risks during mine planning. This paper presents an approach to evaluate community acceptance (i.e., community preferences for the alternatives) using discrete choice models and decision-based design during mine planning. Using discrete choice models and a rigorous framework, engineers can estimate the cost of social risks as a function …

Classification Of Explainable Artificial Intelligence Methods Through Their Output Formats, Giulia Vilone, Luca Longo

Articles

Machine and deep learning have proven their utility to generate data-driven models with high accuracy and precision. However, their non-linear, complex structures are often difficult to interpret. Consequently, many scholars have developed a plethora of methods to explain their functioning and the logic of their inferences. This systematic review aimed to organise these methods into a hierarchical classification system that builds upon and extends existing taxonomies by adding a significant dimension—the output formats. The reviewed scientific papers were retrieved by conducting an initial search on Google Scholar with the keywords “explainable artificial intelligence”; “explainable machine learning”; and “interpretable machine learning”. …

Scale-Dependence Of Hematite Nanoparticle Sulfidation, Uma Lad

Earth Sciences Theses and Dissertations

Iron (oxyhydr)oxides are widespread in the environment and have a disproportionate effect on the fate of metal(loid)s in groundwater. Numerous studies demonstrate the effect of iron-sulfur dynamics on contaminant sequestration, and particle size further impacts the reactivity of iron (oxyhydr)oxides, including their capacity for sorption and precipitation. This study examines the role of particle size on the sulfidation of iron (oxyhydr)oxides. Synthetic hematite nanoparticles with approximate diameters of 7.1 nm and 104 nm were coated onto quartz sand and reacted with bisulfide by advective flow.

Characterization of these nanoparticles revealed hydroxyls present at the hematite surface, with large particles having …

Reducing Power During Manufacturing Test Using Different Architectures, Yi Sun

Computer Science and Engineering Theses and Dissertations

Power during manufacturing test can be several times higher than power consumption in functional mode. Excessive power during test can cause IR drop, over-heating, and early aging of the chips. In this dissertation, three different architectures have been introduced to reduce test power in general cases as well as in certain scenarios, including field test.

In the first architecture, scan chains are divided into several segments. Every segment needs a control bit to enable capture in a segment when new faults are detectable on that segment for that pattern. Otherwise, the segment should be disabled to reduce capture power. We …

From Small Molecules To Infinite Crystals: Probing Noncovalent Interactions Through Vibrational Spectroscopy, Sadisha Nanayakkara

Chemistry Theses and Dissertations

During my four years in the CATCO group supervised by Dr. Kraka, I have been exposed to various topics targeted to address a multitude of chemical problems, broadening our knowledge of modern chemistry research as we know it. In undertaking the age-old problem of understanding the nature of chemical bonding, I could modestly contribute with my work, using in-house tools based on vibrational spectroscopy.

First part of my dissertation is focused on inventing new methods and tools to efficiently investigate chemical bonding, followed by the study of some non-covalent interactions, imperative in catalysis and solid-state chemistry. This includes analysis of …

Promoting Inclusion And Equity, Unh Communications And Public Affairs

UNH Today Archive

No abstract provided.

2021-August-04-Competition Begins.Pdf, University Marketing And Communication, East Tennessee State University

ETSU News

JOHNSON CITY –  (August 4, 2021) The annual MATE ROV Competition World Championship is Aug. 5-7 at East Tennessee State University. Some of the brightest minds from around the globe will compete with remotely operated vehicles (ROVs) they designed and built both in-person and through telepresence.

After the 2020 competition was cancelled due to COVID-19, this year’s championship has been reimagined to include an in-person event on the ETSU campus, a telepresence competition requiring video submissions of ROVs performing tasks and virtual presentations, and a MATE Virtual Reality World. In-person underwater challenges will take place at the ETSU Basler Center …

A Fast Method For Computing Volume Potentials In The Galerkin Boundary Element Method In 3d Geometries, Sasan Mohyaddin

Mathematics Theses and Dissertations

We discuss how the Fast Multipole Method (FMM) applied to a boundary concentrated mesh can be used to evaluate volume potentials that arise in the boundary element method. If $h$ is the meshwidth near the boundary, then the algorithm can compute the potential in nearly $\Ord(h^{-2})$ operations while maintaining an $\Ord(h^p)$ convergence of the error. The effectiveness of the algorithms are demonstrated by solving boundary integral equations of the Poisson equation.

Statistical Mechanics Of Nonlinear Waves: Growth And Decay Of Coherent Structures Interacting With Random Waves, Yuanting Chen

Mathematics Theses and Dissertations

High-amplitude coherent structures have been observed in many nonlinear wave systems, ranging from fluids, plasmas to optical waves. In this dissertation, we explore the interaction of Rayleigh-Jeans distributed low-amplitude random waves with coherent solitary structures in a nonintegrable and non-collapsing version of the nonlinear Schr\"odinger equation. We try to understand if such an interaction enhances or erodes the coherent structures with the method of statistical mechanics. We find the threshold of the growth and decay of the coherent structure by equating the phase frequency of the coherent structure to the chemical potential of low-amplitude weakly nonlinear random waves. If the …

Finite Element Approximation Of Solutions Of The Equations Of Electroporoelasticity, Yu Hu

Mathematics Theses and Dissertations

In this thesis we consider the solution of the equations of electroporoelasticity, which are a combination of Maxwell's equations and the poroelasticity equations. Included is a description of suitable initial and boundary conditions, weak formulation of the equations, and the error estimate for a general numerical method.

Hec-Hms Model For Urban Flood Analysis In Belik River, Yogyakarta, Indonesia, Suprayogi Slamet, Rifai, Latifah Reviana

ASEAN Journal on Science and Technology for Development

The rapid development of Yogyakarta has made city development increase. This construction continues to expand the reach of impervious surfaces. As a result, surface runoff and maximum discharge have increased, overflowing up to urban drainage. This study aimed to analyze the maximum discharge of the watershed based on design storms with 2, 5, 10, and 25-year return periods, used for flood control considerations. The urban flood was modelled using HEC-HMS. The results showed that the contribution of discharge flow in each segment is influenced by the dominance of land use, in which the segment dominated by dense settlements has a …

Compassion Satisfaction, Burnout, And Intent To Stay Among Nurse Leaders, Lisa D. Surby

Dissertations

Nurses in leadership roles have a substantial influence on the quality of the work environment and on safety, quality, and patient outcomes. However, compassion satisfaction (CS) and burnout (BO) have historically been understudied, and evidence is lacking regarding the existence of a relationship between CS, BO, and intent to stay among nurse leaders. The purpose of this cross-sectional descriptive study, guided by Stamm's theory of CS and compassion fatigue (CF), was to determine if there was a relationship between CS and BO and intent to stay among nurse leaders. An anonymous online survey was conducted using the Professional Quality of …

Semantic Matching Evaluation: Optimizing Models For Agreement Between Humans And Autotutor, Colin Mackenzie Carmon

Electronic Theses and Dissertations Archive

The goal of this thesis is to evaluate the answers that students give to questions asked by an intelligent tutoring system (ITS) on electronics, called ElectronixTutor. One learning resource of ElectronixTutor is AutoTutor, an instructional module that helps students learn by holding a conversation in natural language. The semantic relatedness between a student’s verbal input and an ideal answer is a salient feature for assessing performance of the student in AutoTutor. Inaccurate assessment of the verbal contributions will create problems in AutoTutor’s adaptation to the student. Therefore, this thesis evaluated the quality of semantic matches between student input and the …

First Occurrence Of Eurasian Wigeon (Mareca Penelope L.) In Central México, Jorge E. Ramírez-Albores, Rogelio Bautista-Trejo, Héctor Cayetano Rosas

Western North American Naturalist

This study reports an occurrence of Eurasian Wigeon (Mareca penelope) at Lago de Guadalupe in Cuautitlán Izcalli, State of Mexico. In January, February, and March 2021, we documented one individual foraging and swimming. Our observation is the first record of this species in central Mexico, 650 km southwest of the closest prior record in Mexico. We concluded that the Eurasion Wigeon individual probably migrated with American Wigeon (Mareca americana) individuals.


El presente estudio reporta la ocurrencia de la Pato silbón (Mareca penelope) en el Lago de Guadalupe en Cuautitlán Izcalli, Estado de México. En …

Methane Emissions From Stormwater Ponds, Brianna Pollard

Theses

Methane (CH4) is a powerful greenhouse gas that has a global warming potential 28 times larger than carbon dioxide (CO2) on a 100-year horizon. Methane emissions from inland freshwater sources are not as well understood as those from other sources; however, current estimates suggest that they account for a significant portion of global CH4 emissions. Emissions from inland waters are difficult to measure due to their high spatiotemporal variability, leading to high levels of uncertainty and a need for more CH4 flux data from these freshwater systems. Increased runoff associated with urbanization has led to construction of man-made inland waters …

Use And Access Of E-Resources Among Students In The National Institute Of Engineering College Library In Mysuru: A Study, Dr. Chandrashakara J

Library Philosophy and Practice (e-journal)

This research examines the factors influencing the Use and Access of e-resources among Students in the National Institute of Engineering College Library in Mysore: A Study. Provide e-resources facilities and services in the library. A well-structured questionnaire was administered to the National Institute of Engineering College Library in Mysuru and collected the data regarding use and access of e-resources in the college library. The survey reveals that use and access of e-resource among students. Library users also take advantage of the existing e-resources. These resources were found to be more than 45% satisfied with the time saving, to Access top …

A Call For A Better Understanding Of Aquatic Chytrid Biology, Davis Laundon, Michael Cunliffe

School of Biological and Marine Sciences

The phylum Chytridiomycota (the “chytrids”) is an early-diverging, mostly unicellular, lineage of fungi that consists of significant aquatic saprotrophs, parasites, and pathogens, and is of evolutionary interest because its members retain biological traits considered ancestral in the fungal kingdom. While the existence of aquatic chytrids has long been known, their fundamental biology has received relatively little attention. We are beginning to establish a detailed understanding of aquatic chytrid diversity and insights into their ecological functions and prominence. However, the underpinning biology governing their aquatic ecological activities and associated core processes remain largely understudied and therefore unresolved. Many biological questions are …

A Multiplicity Of Journeys: Stem Education Ecosystems As Sources Of Cultural Sustenance, Christopher Louis Beauprey Cardiel

Dissertations and Theses

In this document, I outline the context and significance of a research problem faced by both formal and informal science, technology, engineering, and math (STEM) educators in the Portland metro area--specifically, the need for greater understanding of the individual and cultural motivations, needs, and agentic behavior of learners, as well as the ways in which these factors intersect with learners' experiences of cultural sustenance within their holistic STEM education ecosystems. I base the significance of this problem on the racial and gender inequities evident in the STEM fields and the social and cultural dynamics that discourage members of these groups …

Proximal Policy Optimization For Radiation Source Search, Philippe Erol Proctor

Dissertations and Theses

Rapid localization and search for lost nuclear sources in a given area of interest is an important task for the safety of society and the reduction of human harm. Detection, localization and identification are based upon the measured gamma radiation spectrum from a radiation detector. The nonlinear relationship of electromagnetic wave propagation paired with the probabilistic nature of gamma ray emission and background radiation from the environment leads to ambiguity in the estimation of a source's location. In the case of a single mobile detector, there are numerous challenges to overcome such as weak source activity, multiple sources, or the …

Volume 28, Numbers 1, 2, 3, 4, Fall 1990/Winter 1991/Spring 1991/Summer 1991 Speaker & Gavel

Speaker & Gavel

Complete digitized issue (volume 28, issue 1-4, Fall 1990/Winter 1991/Spring 1991/Summer 1991) of Speaker & Gavel.

Effects Of Microwave-Assisted Extraction On The Free Radical Scavenging And Ferrous Chelating Abilities Of Monostroma Nitidum Extract, Yeu-Pyng Lin, Shao-Chi Wu, Shih-Li Huang

Journal of Marine Science and Technology–Taiwan

The optimum treatments of Monostroma (M.) nitidum extract were studied using response surface methodology, and pulsed microwave-assisted extraction (MAE) method was applied in this study. The study was performed using a threelevel, three-factor design and aimed at determining the optimum combinations of particle size of M. nitidum particle (X1), concentration of M. nitidum (X2), and ethanol percentage (X3). The response variables of the α-diphenyl-α-picrylhydrazyl (DPPH) radical scavenging effect and ferrous ion chelating capacity were significantly affected by particle size (X1) and the ethanol percentage (X3) at a significance level of 5%. The coefficients of determination (R2) of the response surface …

A Fault-Tolerant Optimal Message Routing Methodology For Cube-Nnected- Les Parallel Computers, Gene Eu Jan, Cheng-Hung Li, Yung-Yuan Chen, Shao-Wei Leu

Journal of Marine Science and Technology–Taiwan

A cube-connected-cycles (CCC) is a regular graph, suitable for constructing the interconnection network of parallel or multi-node computer systems. The CCC network possesses the features of symmetry, regularity, fault tolerance, and fixed degree of the network. Message delivery through an interconnection network sometimes fails due to processing node and/or link faults or simply because some processors are too busy to handle message transfer. To make a CCC-based parallel computer more resilient to node/link faults, this paper proposes an optimal routing method that guarantees to find a shortest path between the source and the destination nodes within a faulty CCC-based network …

A Novel Signal Processing Approach For Valve Health Condition Classification Of A Reciprocating Compressor With Seeded Faults Considering Time-Frequency Partitions, Yih-Hwang Lin, Wen-Sheng G Lee, Chung-Yung Wu

Journal of Marine Science and Technology–Taiwan

This study deals with a novel signal processing approach for automated valve condition classification of a reciprocating compressor with seeded faults. The classification system consists of a front end time-frequency analysis platform for the vibration signal measured, fault feature vectors for making the formidable amount of time-frequency data manageable, and a probabilistic neural network for automatic classification without the intervention of human experts. Rather than representing each time-frequency data set with one single feature vector comprising three indices, namely time, frequency, and amplitude, the time-frequency plane is further partitioned into an appropriate number of sub-regions to enhance the characteristics representation …

A Vendor-Buyers Integrated Inventory Model Involving Quality Improvement Investment In A Supply Chain, Ming-Feng Yang, Ming-Cheng Lo, Ta-Ping Lu

Journal of Marine Science and Technology–Taiwan

Today’s supply chain environment requires a new spirit of cooperation between the buyer and the vendor. So the characteristics of current manufacturing systems are consistent high quality, small lot sizes, frequent delivery, and close supplier ties. Just-in-time (JIT) production is an integrated set of activities to achieve those objects by adopting continuous quality improvement and developing a long-term partnership. This paper presents the optimum joint economic lot size in a case where multiple buyers are demanding one type of item from a single vendor by summing the ordering/setup cost, holding cost and quality improvement investment. This model is useful particularly …

A Rigorous Review And Thorough Planning For The Ship Inspection System In Taiwan, Shuen-Tai Ung, Chi-Cheng Tsai, Chih-Li Chen

Journal of Marine Science and Technology–Taiwan

The ship inspection system can be regarded as a frontline fighting against substandard ships. However, the ship inspection rate in Taiwan is low and the vessels under the flag are categorized in the Grey List by Paris and Tokyo MOUs according to statistics. Thus, the current status of the ship inspection system of the country should be examined and improved. In this paper, the ship inspection system is evaluated in terms of the system structure, legislation, mechanisms and training patterns. The shortcomings are appreciated under the Hierarchical Task Analysis structure. A list of the alternatives for improvement and the priority …

Semi-Active Vibration Control For Offshore Platforms Based On Lqg Method, Shu-Qing Wang, Ning Li

Journal of Marine Science and Technology–Taiwan

The objective of this paper is to mitigate the wave-induced vibration of offshore platform with magneto-rheological (MR) damper. The model of the platform coupled with MR damper is established where the external wave force is approximated with a white noise via a designed filter. Based on Linear Quadratic Gaussian (LQG) method, the optimal control force is determined when taking the measurement noise into account. Semi-active control algorithm is applied to generate the MR damping force by comparing with the optimal control force. Numerical example demonstrates that the semi-active control strategy based on LQG method can reduce the responses of the …

Numerical Stability Analysis For Independent Modal Vibration Suppression Of A Fluid-Conveying Pipe Using A Piezoelectric Inertia Actuator, Yih-Hwang Lin, Jui-Lung Chen, Chih-Liang Chu, Yau-Kun Tsai

Journal of Marine Science and Technology–Taiwan

This study deals with numerical stability analysis for independent modal vibration suppression of a fluid-conveying pipe using a piezoelectric inertia actuator (PIA). The stability issue of the approach as proposed by the pioneer developers is addressed. The approach utilizes an infinite control weight for one component of the modal control input and results in a severe control spillover problem for the complex mode controlled, easily leading to closed loop instability even for open loop stable systems. The stability of the system depends on how the left eigenvector is normalized for transforming the original coupled equations to the decoupled ones in …