Digital Commons Network^™

The Influence Of Clutter On Target Prevalence And Decision Making During Visual Search, Brandon Eich

LSU Master's Theses

Participants are sensitive to target prevalence effects in visual search. Low prevalence of targets leads to increased miss rates and shorter response times, and high prevalence of targets leads to increased false alarm rates and longer response times. These effects have been explained using the Multiple-Decision Model (MDM), in which two decisions impact performance during serial visual search. The first decision is whether an inspected item is a target. The second decision is whether the search should be ended with a target-absent response. Target prevalence influences these decisions, evidenced by changes in miss rate, false alarm rate, and response time. …

General Feature Extraction For Process Monitoring Using Transfer Learning Approaches, Wenbo Zhu, Jinhong Zhang, Jose Romagnoli

Faculty Publications

Data-driven methods have been widely used in process monitoring and fault detection areas. Despite that, most of these data-driven approaches are extremely specific, where the developed models can only be applied in the given process with the selected variables. The lack of generalization potentially limits its applications. This work mainly focuses on developing a model with better generalization ability and transferability for process data analytics. We proposed a transitional invariant feature extraction method using convolutional neural networks, which can learn features regardless of the size or sequence of the input. Such an approach allows the transfer learning so that the …

Computer Science At Community Colleges: Attitudes And Trends, Trenton W. Dawson

LSU Doctoral Dissertations

This study aimed to understand the identity and attitude of students enrolled in computer science (CS) or programming-related course at community colleges nationwide. This study quantitatively evaluation data for estimating the relationships between students’ identity and attitudes toward computer science with prior programming experience and other demographic factors. I distributed the survey to community college faculty of computer science programs nationwide. Questions for this study were adapted from the Computing Attitude Survey developed by Weibe, Williams, Yang, & Miller (2003). Using two robust quantitative statistical methodologies, I investigated the correlations and predictability of previous programming experience, gender, race, and age …

Age And Growth Of Blackfin Tuna (Thunnus Atlanticus) In The Gulf Of Mexico, Elsa M. Gutierrez

LSU Master's Theses

Tunas are highly migratory species that are ecologically and economically important components of oceanic ecosystems worldwide. Unfortunately, life history information for the smallest true tuna (genus: Thunnus), blackfin tuna Thunnus atlanticus, is scarce despite the fact that it is the most abundant tuna found throughout much of the western Atlantic. In this study an otolith-based aging approach was used to evaluate age and growth relationships, examine sexual dimorphism in growth, and derive mortality estimates for blackfin tuna in the Gulf of Mexico. Age and growth relationships were evaluated using two models commonly applied to age-at-length data for tunas: the …

Analysis Of Briquetage (Brine-Boiling Pots) At Paynes Creek Salt Works: Implications For Classic Maya Salt Production, Rianna Bowen

LSU Master's Theses

Abstract

The Classic Maya period (A.D. 300-900) is characterized by large urban centers, distinct material culture, and long-distance trade of both utilitarian and elite goods. The rise in population during this time created a necessity for essential, everyday goods, to move along these trade routes; one of which was salt. Additionally, much of the production of utilitarian goods was occurring outside of urban centers and political control at smaller, specialized production locales. The Paynes Creek Salt Works in southern Belize was one of these specialized production locales. The number of salt works located in the Punta Ycacos lagoon suggests salt …

Ysaye Sonata No.4 - A Sonata Of Past And Future, Naiyin Hou

LSU Doctoral Dissertations

A golden age of violin playing arose during the late 19th and early 20th centuries. Different violin schools were established, with their own beliefs concerning technique and interpretation. Some violinists displayed high virtuosity in their playing; whereas, others pursued establishing a noble and simple interpretation following the composer’s musical instruction. Different playing styles were developing, and people had their own preference on one or another. Eugène Ysaÿe was able to present qualities from different schools altogether in his playing, and developed a style of playing that was admired by the later generation. Many violinists in the late 19th century were …

Tuning Properties Of Topological Insulators: An Ab-Initio Approach, Karunya Shailesh Shirali

LSU Doctoral Dissertations

This thesis develops a first-principles based approach to explore the tuning of topological properties of the tetradymite topological insulators. We begin by setting up a framework to systematically obtain the bulk and surface properties of topological insulators, treating the structural and electronic properties on an equal footing. We determine a consistent method for including the van der Waals interactions, which are responsible for the weak coupling between sets of atomic layers in this family of layered materials, which is important in obtaining accurate structural properties. We obtain close agreement with experimental values for both the bulk and surface states.

To …

A Deep Reinforcement Learning Approach With Prioritized Experience Replay And Importance Factor For Makespan Minimization In Manufacturing, Jose Napoleon Martinez

LSU Doctoral Dissertations

In this research, we investigated the application of deep reinforcement learning (DRL) to a common manufacturing scheduling optimization problem, max makespan minimization. In this application, tasks are scheduled to undergo processing in identical processing units (for instance, identical machines, machining centers, or cells). The optimization goal is to assign the jobs to be scheduled to units to minimize the maximum processing time (i.e., makespan) on any unit.

Machine learning methods have the potential to "learn" structures in the distribution of job times that could lead to improved optimization performance and time over traditional optimization methods, as well as to adapt …

Improving Memory Forensics Capabilities On Apple M1 Computers, Raphaela Santos Mettig Rocha

LSU Master's Theses

Malware threats are rapidly evolving to use more sophisticated attacks. By abusing rich application APIs such as Objective-C’s, they are able to gather information about user activity, launch background processes without the user’s knowledge as well as perform other malicious activities. In some cases, memory forensics is the only way to recover artifacts related to this malicious activity, as is the case with memory-only execution. The introduction of the Rosetta 2 on the Apple M1 introduces a completely new attack surface by allowing binaries of both Intel x86 64 and ARM64 architecture to run in userland. For this reason it …

Seismic Inversion And Modeling For Improving Earthquake Hazard Assessment, Rasheed Ajala

LSU Doctoral Dissertations

The substantial research and the uncertain timeline to achieve deterministic earthquake prediction make the ground-shaking estimation of realistic earthquake scenarios a helpful approach in seismic hazard assessment. The accuracy of these computations depends on having structural subsurface models with good representations of sedimentary basins, fault zones, and crustal heterogeneity. We develop higher resolution seismic models for the Coachella Valley in Southern California and Indo-Burma. These areas have rising populations, expanding infrastructure, and highly anticipated disruptive earthquakes. We utilize data from recent seismic deployments and newly developed seismic imaging algorithms and the techniques of travel time tomography, wave propagation simulation, and …

Marker-Trait Association Mapping Of Sorghum Mosaic Virus Resistance In Sugarcane, Chenie Zamora

LSU Master's Theses

Mosaic is a potentially devastating disease of sugarcane that had severe economic impact on Louisiana’s sugarcane industry in the 1920’s and has caused periodic problems ever since. The disease is vectored by migrating aphids that transmit Sugarcane mosaic virus (SCMV) and Sorghum mosaic virus (SrMV) in a non-persistent manner. Mosaic in Louisiana is currently caused by strains of SrMV. Mosaic has been controlled primarily by developing resistant cultivars. Recently, mosaic was detected in some near-commercial clones in the cultivar selection program. This prompted extensive screening of breeding program parent populations that detected infiltration of susceptibility and revealed the need for …

Re-Evaluation Of Late Season Action Thresholds And The Effect Of Seed Treatments On Early Season Colonization Of Threecornered Alfalfa Hopper, Spissistilus Festinus (Say), In Louisiana Soybean, Glycine Max (L) Merr, Tyler Ray Tagle Musgrove

LSU Master's Theses

Soybean, Glycine max (L.) Merr, is considered the most economically important oil and feed crop in the US and is grown on nearly 35,000,000 ha on an annual basis. Factors that limit yield include weed pressure, disease infection, and of particular interest to entomologists, insect herbivory. Soybean is targeted by a range of above and below ground pests which are primarily controlled by insecticides. Neonicotinoids are a recently popularized insecticide class that when applied as a seed treatment, can provide protection from early season pests. The most economically significant early season pest is threecornered alfalfa hopper, Spissistilus festinus (Say), whose …

Teachers' And Students' Perceptions Of Goal Orientation Theory In Secondary Instrumental Music Classrooms: A Case Study, Carlye Mcgregor

LSU Master's Theses

Goal orientation theory (Ames, 1992; Blumenfeld, 1992) is a cognitive theory that identifies how goals affect motivation in students. The benefits of mastery goal orientation — aspects of instruction which support the connection between effort and achievement — on student motivation and participation have been well-documented. Researchers (Ames & Archer, 1988; Patrick, et al., 2001) found students can pick up on goal cues and identify traits of each theory apparent in their classroom. Teachers communicate their values through goal structures, and student motivation can be improved by consistent goal structures, or negatively affected by misaligned goal structures (Ames & Archer, …

Implicit Bias In Speech-Language Pathology Students, Skyller Castello

LSU Master's Theses

Implicit racial biases have been documented across a variety of allied health professions. A systematic review conducted by FitzGerald and Hurst (2017) of implicit bias in healthcare professionals found that 20 out of 25 studies examined displayed bias against BIPOC in diagnosis, treatment recommendations, and other aspects of the medical care they received. A literature review completed by Hall et al. (2015) found similar results, stating that 9 of the 15 studies examined identified bias against Black clients. One allied healthcare profession, speech-language pathology, interacts with a diverse clientele in a clinical environment and yet have been excluded from much …

The Early Lieder Of Josephine Lang: A Comparative Study, Rachel E. Cisneros

LSU Master's Theses

Josephine Lang's contribution to nineteenth-century song has been increasingly recognized in recent scholarship. This is largely because of Harald Krebs’s and Sharon Krebs's groundbreaking book, Josephine Lang: Her Life and Songs (2007). In their book, Krebs and Krebs draw information about Lang’s life from two early biographies, the first written during Lang’s lifetime by Ferdinand Hiller and the second written after her death by her son Heinrich Adolf Köstlin. Primary sources fill in the gaps that these two nineteenth-century biographies left open. For example, the letters between Lang and her correspondents also reveal much about her social reputation, financial hardships, …

The Rise Of Rome, The Fall Of Spain: Classical Reception In Leopoldo Alas, Galdós, And José Díaz Fernández, Meghan E. Hodges

LSU Master's Theses

The turn of the century was a period of rapid change and modernization. Spain, unlike neighboring European nations, was collapsing as an imperial force. The ensuing crisis of national identity fueled existing political tensions from the early nineteenth century which would lead to the Spanish Civil War (1936-1939). This thesis examines various national crises from 1890 and the decade preceding the loss of Spain’s final colonies to 1929 and the decade preceding the Civil War. Both of these periods saw substantial acceleration of modernization and incredible resistance to it. Despite the hyper-presence of modernity within contemporary literary movements, there is …

Rethinking The Design Of Online Professor Reputation Systems, Haley Tatum

LSU Master's Theses

Online Professor Reputation (OPR) systems, such as RateMyProfessors.com (RMP), are frequently used by college students to post and access peer evaluations of their pro- fessors. However, recent evidence has shown that these platforms suffer from major bias problems. Failing to address bias in online professor ratings not only leads to negative expectations and experiences in class, but also poor performance on exams. To address these concerns, in this thesis, we study bias in OPR systems from a software design point of view. At the first phase of our analysis, we conduct a systematic literature review of 23 interdisciplinary studies on …

Gps Observations Of Subsidence In South Louisiana Over Seasonal And Sub-Seasonal Timescales Associated With Hydrologic Loading, Nicholas Schuler

LSU Master's Theses

Louisiana’s primary environmental concern is arguably coastal wetland loss due to high subsidence rates, previously estimated to range from 1-14 mm/yr across much of the coast. Spatially and temporally varying strong short-term and seasonal components of deformation associated with changes in hydrologic loading throughout the year can give information about the elastic properties of the shallow crust, having implications for better understanding long-term subsidence trends across the region. Therefore, we quantify and characterize vertical deformation that occurs on annual to sub-annual timescales across southeast Louisiana. Vertical deformation is evaluated using publicly available daily GPS positions from 2016–2020 at 16 stations …

Effect Of Steam Conditioning On Pecan Safety And Quality And Utilization Of Pecan Shell Extract As An Antimicrobial Coating To Maintain The Quality And Safety Of Fresh Produce, Karuna Kharel

LSU Doctoral Dissertations

Pre- and post-harvest practices can pose microbial risk on fresh produce thus, appropriate intervention strategies to inactivate foodborne pathogens without compromising quality is important. The first part of this study investigated the effect of steam conditioning on inactivating Enterococcus faecium, a surrogate for Salmonella enterica, on in-shell pecans; and second part determined the in vitro and in vivo antimicrobial efficacy of pullulan coating incorporated with pecan shell extract on produce. The treatments’ effect on quality of pecans and produce during storage were also evaluated. In-shell pecans inoculated with Enterococcus faecium (7.28±0.17logCFU/g) were treated with steam at 70°C, 80°C …

Practical Considerations And Applications For Autonomous Robot Swarms, Rory Alan Hector

LSU Doctoral Dissertations

In recent years, the study of autonomous entities such as unmanned vehicles has begun to revolutionize both military and civilian devices. One important research focus of autonomous entities has been coordination problems for autonomous robot swarms. Traditionally, robot models are used for algorithms that account for the minimum specifications needed to operate the swarm. However, these theoretical models also gloss over important practical details. Some of these details, such as time, have been considered before (as epochs of execution). In this dissertation, we examine these details in the context of several problems and introduce new performance measures to capture practical …

A New Perspective On A Polynomial Time Knot Polynomial, Robert John Quarles

LSU Doctoral Dissertations

In this work we consider the Z1(K) polynomial time knot polynomial defined and
described by Dror Bar-Natan and Roland van der Veen in their 2018 paper ”A polynomial time knot polynomial”. We first look at some of the basic properties of Z1(K), and develop an invariant of diagrams Ψm(D) related to this polynomial. We use this invariant as a model to prove how Z1(K) acts under the connected sum operation. We then discuss the effect of mirroring the knot on Z1(K), and described a geometric interpretation of some of the building blocks of the invariant. We then use these to …

Effects Of Engagements And Presentation Order In Informal Science Presentations, William Henry Katzman

LSU Doctoral Dissertations

Science museums conduct presentations for their audiences to attract and educate visitors, yet research on presentations has primarily concentrated on whether individual presentations were effective. This mixed-methods, quasi-experimental study looks at how the presenter’s mental and physical engagements within a presentation affects audience members by altering sociocultural context of the presentation.

Physical engagements involve asking audience members to physically participate, while mental engagements involved asking audience members to make predictions prior to observing a demonstration. Audiences were given presentations containing: 1) Both mental and physical engagements, 2) Physical engagements only, 3) Mental engagements only or 4) No engagements (control).

This …

The State Of Agricultural Mechanics In The Preparation Of School-Based Agricultural Education Teachers, Tyler Granberry

LSU Doctoral Dissertations

Agricultural mechanics has become a primary subject area for school-based agricultural education (SBAE). However, despite a long history and high prevalence in SBAE, preservice and in-service SBAE teachers have frequently expressed concerns regarding teaching agricultural mechanics. Research from the early 21st century documented the characteristics of preservice SBAE teacher training in agricultural mechanics on a national level. However, more recent studies have suggested that the agricultural mechanics training requirements for preservice SBAE teachers have changed. The purpose of this study was to compare the level of agricultural mechanics preparation of preservice SBAE teachers between 2000 and 2021. To accomplish this, …

Advanced Communication And Sensing Protocols Using Twisted Light And Engineered Quantum Statistics, Michelle L. Lollie

LSU Doctoral Dissertations

Advanced performance of modern technology at a fundamental physical level is driving new innovations in communication, sensing capability, and information processing. Key to this improvement is the ability to harness the power of physical phenomena at the quantum mechanical level, where light and light-matter interactions produce technological advancement not realizable by classical means. Theoretical investigation into quantum computing, sensing capability beyond classical limits, and quantum information has prompted experimental work to bring state-of-the-art quantum systems to the forefront for commercial use. This dissertation contributes to the latter portion of the work. A set of preliminaries is included highlighting pertinent physical …

Colonial Myths: The Conquest Of Cabeza De Vaca, Willie Hurst

LSU Master's Theses

This thesis examines the relaciónes (report) Naufragios (1542) and Comentarios (1555) with the intention of expanding upon the ample publications already existent on Cabeza de Vaca. With this thesis I offer a contrasting reading and reexamination of both of Cabeza de Vaca’s works. I argue that a number of the scholarly publications on Cabeza de Vaca fail to understand, define, and explore the identity and goals of Cabeza de Vaca as his own unique version of a conqueror which ultimately leads to a misunderstanding and misinterpretation of the texts. After an initial chapter discussing how Cabeza de Vaca never underwent …

Sediment Buffering And Recycling On An Annual To Centennial Scale Along The Mississippi River, Nikki E. Neubeck

LSU Master's Theses

Although the Mississippi River and its tributaries have been investigated for many years, the alteration of the river through dams, levees, and diversions has affected how sediment is transported from source to sink (>10³ y). Previous provenance research using detrital zircon U-Pb dating indicates a slow transport time from source-to-sink, but recent anthropogenic alterations of the river may potentially diminish the transportation time of heavy minerals due to an increase in flow efficiency. The objective of this study is to analyze the degree of buffering and recycling of Mississippi River sediment over a range of short time scales, …

A Novel Endo Gia™ Staple Cartridge For Canine Lung Lobectomies, Alissa St. Blanc

LSU Master's Theses

The canine lungs are well suited for ventilation, gas exchange, and gas transport. In diseased states, changes within bronchi and pulmonary parenchyma alter the blood-gas interface. Diagnostic workups to characterize pulmonary disease may include blood gas analysis, bronchoalveolar lavage, tracheobronchoscopy, radiography and/or computed tomography. Surgical pulmonary diseases include cysts, bullae, and blebs; congenital anomalies; consolidation or abscessation; bronchiectasis; lacerations; lung lobe torsions; and neoplasia. Surgical options may include laceration repair, partial or total lung lobectomy, and pneumonectomy. These options are most commonly utilized in cases that fail medical management. Lung lobectomies were originally performed using suture ligation. Stapling devices have …

Shocking: Using Machine Learning Techniques To Nowcast Lightning Strikes From Station Level Data, Michael D. Broussard

LSU Master's Theses

Lightning strikes are incredibly common and potentially hazardous. Lightning can lead to loss of life, property damage, or can trigger other hazardous events like wildfires. They are also the result of incredibly complex physical processes in the atmosphere, making it challenging to predict strikes. However, given the extensive data and robust analytical techniques available, machine learning methods could be used to establish data relationships between lightning strikes and ground-level atmospheric measurements. Such a model could be used to provide any surface-based weather station with a method for predicting incoming strikes, making it easier to avoid the potentially hazardous effects of …

Characterizations Of Certain Classes Of Graphs And Matroids, Jagdeep Singh

LSU Doctoral Dissertations

``If a theorem about graphs can be expressed in terms of edges and cycles only, it probably exemplifies a more general theorem about matroids." Most of my work draws inspiration from this assertion, made by Tutte in 1979.

In 2004, Ehrenfeucht, Harju and Rozenberg proved that all graphs can be constructed from complete graphs via a sequence of the operations of complementation, switching edges and non-edges at a vertex, and local complementation. In Chapter 2, we consider the binary matroid analogue of each of these graph operations. We prove that the analogue of the result of Ehrenfeucht et. al. does …

Folk Elements In Bright Sheng’S Three Fantasies For Violin And Piano: A Performer’S Guide To Interpretation, Kaiyue Zhu

LSU Doctoral Dissertations

In the present age, a wide variety of popular music is composed. Contemporary classical music of the twenty-first century also promotes the development and innovation of world music. All these various genres of music give people a sense of peace and comfort, briefly escaping from the bustle and hurry of busy working lives. Bright Sheng is a Chinese American composer who is one of the representatives of contemporary classical music and has gained attention and popularity in the musical field. The project aims to show how he fuses folk elements and western musical techniques to form his unique musical style …