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Articles 1261 - 1290 of 18423
Full-Text Articles in Entire DC Network
A Study Of Random Partitions Vs. Patient-Based Partitions In Breast Cancer Tumor Detection Using Convolutional Neural Networks, Joshua N. Ramos
A Study Of Random Partitions Vs. Patient-Based Partitions In Breast Cancer Tumor Detection Using Convolutional Neural Networks, Joshua N. Ramos
Master's Theses
Breast cancer is one of the deadliest cancers for women. In the US, 1 in 8 women will be diagnosed with breast cancer within their lifetimes. Detection and diagnosis play an important role in saving lives. To this end, many classifiers with varying structures have been designed to classify breast cancer histopathological images. However, randomly partitioning data, like many previous works have done, can lead to artificially inflated accuracies and classifiers that do not generalize. Data leakage occurs when researchers assume that every image in a dataset is independent of each other, which is often not the case for medical …
Automated Tree Mortality Detection Using Ubiquitously Available Public Data, Michael T. Huggins
Automated Tree Mortality Detection Using Ubiquitously Available Public Data, Michael T. Huggins
Master's Theses
Understanding the dynamic interplay between fire severity, topography, and tree mortality, is crucial for predicting future forest dynamics and enhancing resilience against climate change-induced wildfire regimes. This thesis develops a multi-sensor approach for automated estimation of tree mortality, then applies it to examine trends in tree mortality over a six-year period across a fire affected study site in the Trinity River basin in Northern California. The Random Forest model uses publicly available USGS 3D Elevation Program Lidar (3DEP) and NAIP imagery as inputs and is likely to be easily adaptable to other landscapes. The model had a Receiver Operating Characteristic …
Mary Ann Starkey: Domesticity & Political Leadership In New Bern, North Carolina During The Civil War, Julie A. Zafiratos
Mary Ann Starkey: Domesticity & Political Leadership In New Bern, North Carolina During The Civil War, Julie A. Zafiratos
Master's Theses
Mary Ann Starkey was a pivotal change agent in New Bern, North Carolina during the Civil War. She was born into slavery, yet by 1863 was in a position to bring together abolitionists and recruiters from the North and refugees and freedom fighters from her community. She was president of the 400-member Colored Women’s Union Relief Association of Newbern, North Carolina which worked to heal, feed and support the first colored regiments in North Carolina in their fight for freedom. This thesis looks closely at the Civil War through the life of this one woman, by examining the archival evidence …
Effects Of Anthropogenic Noise On The Provisioning Behavior Of Western Bluebirds And Artificial Light At Night On Nestling Development, Kerstin H. Ozkan
Effects Of Anthropogenic Noise On The Provisioning Behavior Of Western Bluebirds And Artificial Light At Night On Nestling Development, Kerstin H. Ozkan
Master's Theses
Sensory environments are rapidly changing due to increased human activity in urban and non-urban areas alike. For instance, background sounds can interfere with parent-offspring communication and mask cues reflective of predation risk, resulting in elevated vigilance at the cost of provisioning. In chapter 1, we studied nestling provisioning behavior among Western Bluebirds (Sialia mexicana) in response to short-term (1 hr) and long-term (continuous exposure throughout nesting period) noise exposure. Provisioning rates were lower at nests exposed to short-term experimental traffic noise compared to exposure to ambient background sounds. Trial order strongly influenced provisioning behavior, with the decline in …
Stress Effects On The Growth Physiology Of Pacific Rockfishes (Sebastes Spp.): Negative Impacts Of Cortisol And Elevated Temperature Exposure, Hayley M. Mapes
Stress Effects On The Growth Physiology Of Pacific Rockfishes (Sebastes Spp.): Negative Impacts Of Cortisol And Elevated Temperature Exposure, Hayley M. Mapes
Master's Theses
Fish experiencing stressful conditions increase production of the glucocorticoid hormone cortisol, which alters energy intake and allocation to help recover physiological homeostasis. Fish experiencing prolonged elevations of cortisol, however, often exhibit reduced somatic growth. While it has been shown previously in fish that cortisol inhibits anabolic growth processes in part via changes in endocrine growth hormone (Gh)/insulin- like growth factor-1 (Igf1) signaling, it is not fully understood which components of Gh/Igf1 pathways are modulated by cortisol. Here, we explored how cortisol influences the Gh/Igf1 system in blue rockfish (Sebastes mystinus) by administering exogenous cortisol and examining effects on …
Insights Into Cellular Evolution: Temporal Deep Learning Models And Analysis For Cell Image Classification, Xinran Zhao
Insights Into Cellular Evolution: Temporal Deep Learning Models And Analysis For Cell Image Classification, Xinran Zhao
Master's Theses
Understanding the temporal evolution of cells poses a significant challenge in developmental biology. This study embarks on a comparative analysis of various machine-learning techniques to classify cell colony images across different timestamps, thereby aiming to capture dynamic transitions of cellular states. By performing Transfer Learning with state-of-the-art classification networks, we achieve high accuracy in categorizing single-timestamp images. Furthermore, this research introduces the integration of temporal models, notably LSTM (Long Short Term Memory Network), R-Transformer (Recurrent Neural Network enhanced Transformer) and ViViT (Video Vision Transformer), to undertake this classification task to verify the effectiveness of incorporating temporal features into the classification …
A Comparison Of Western And Eastern Soft Systems Approaches, John L. Anaya, John L. Anaya, John L. Anaya
A Comparison Of Western And Eastern Soft Systems Approaches, John L. Anaya, John L. Anaya, John L. Anaya
Master's Theses
Soft System Approaches have been developed worldwide to help problem-solvers and decision-makers develop solutions to complex problems, such as aerospace systems. Soft System Approaches were designed to help lower the disorder of developing a complex system by increasing understanding of a situation. Four Soft System Approaches were investigated, two from the West and two from the East. Within the context of the paper, the West refers to thought patterns associated with thinkers and scientists in Europe and North America, and the East refers to those from and around China. The two from the West are Peter Checkland’s Soft Systems Methodology …
Spatial Drivers Of Soil Health In A Post-Fire Watershed, Reed Jd Williams
Spatial Drivers Of Soil Health In A Post-Fire Watershed, Reed Jd Williams
Master's Theses
Wildland fires are increasing in both severity and intensity leading to severe and lasting biogeochemical effects on soil. The CZU lightning complex started on August 16th, 2020, and burned 86,509 acres causing severe social and ecological damage. To better understand the impact of fire on soil properties at the landscape scale, we created a digital soil mapping model with the inclusion of remotely sensed burn severity covariates. We combined a raster-stack of environmental covariates with rasters for fire severity and soil samples, to disentangle the relative contribution of fire to the spatial distribution of soil properties in the …
An Exploratory Framework For Benchmarking Vehicle Miles Traveled (Vmt) Estimates Associated With University Campuses, Troy Kawahara
An Exploratory Framework For Benchmarking Vehicle Miles Traveled (Vmt) Estimates Associated With University Campuses, Troy Kawahara
Master's Theses
Although vehicle miles traveled (VMT) has become the standard for assessing transportation related impacts in California, some have concerns that many VMT estimates are not properly grounded or informed by real world data, potentially resulting in flawed estimates and impact assessments. This is especially true of special generators, like college and university campuses, which have complex travel patterns distinct from that of the general public. This thesis attempts to resolve a significant disparity observed between two credible VMT estimates for Cal Poly’s campus wide VMT. As part of a campus master planning effort, a VMT estimate was produced in 2019 …
A Study On Ethical Hacking In Cybersecurity Education Within The United States, Jordan Chew
A Study On Ethical Hacking In Cybersecurity Education Within The United States, Jordan Chew
Master's Theses
As the field of computer security continues to grow, it becomes increasingly important to educate the next generation of security professionals. However, much of the current education landscape primarily focuses on teaching defensive skills. Teaching offensive security, otherwise known as ethical hacking, is an important component in the education of all students who hope to contribute to the field of cybersecurity. Doing so requires a careful consideration of what ethical, legal, and practical issues arise from teaching students skills that can be used to cause harm. In this thesis, we first examine the current state of cybersecurity education in the …
Supersonic Air Inlet Modeling Using The Method Of Characteristics, Shay S. Takei
Supersonic Air Inlet Modeling Using The Method Of Characteristics, Shay S. Takei
Master's Theses
The Air Inlet Method of Characteristics Analysis Tool (AIMCAT), a tool based in Python 3, is developed to model supersonic air inlet geometries during the early phases of design. The method of characteristics (MOC) is used to solve the governing equations for an inviscid, irrotational, isentropic, steady, supersonic flowfield. A comparison is made between modeling shock waves implicitly using Mach wave coalescence and modeling them explicitly using oblique shock relations. Multiple test cases are used to assess the accuracy of the tool by comparing to experimental wind tunnel data. Good general agreement was achieved over the majority of the supersonic …
Coralai: Emergent Ecosystems Of Neural Cellular Automata, Aidan A. Barbieux, Aidan A. Barbieux
Coralai: Emergent Ecosystems Of Neural Cellular Automata, Aidan A. Barbieux, Aidan A. Barbieux
Master's Theses
Artificial intelligence has traditionally been approached through centralized architectures and optimization of specific metrics on large datasets. However, the frontiers of fields spanning cognitive science, biology, physics, and computer science suggest that intelligence is better understood as a multi-scale, decentralized, emergent phenomenon. As such, scaling up approaches that mirror the natural world may be one of the next big advances in AI. This thesis presents Coralai, a framework for efficiently simulating the emergence of diverse artificial life ecosystems integrated with modular physics. The key innovations of Coralai include: 1) Hosting diverse Neural Cellular Automata organisms in the same simulation that …
3d Pano Inpainting: Scene Construction Using A Single Input Panorama, Shivam Asija
3d Pano Inpainting: Scene Construction Using A Single Input Panorama, Shivam Asija
Master's Theses
Creating 360-degree 3D content has gained traction in the past few years, being used for Virtual Reality environments. However, creating such content is challenging because it requires a multi-camera setup or a collection of images from different perspectives. This paper proposes 3D Pano Inpainting, a pipeline capable of transforming a single equirectangular panoramic RGBD image into a complete 360° 3D virtual reality scene represented as a textured mesh. Our methodology is as follows: we estimate a consistent depth map for the input panorama; we use a pre built framework to convert the image and its depth map into a textured …
Improving Automatic Transcription Using Natural Language Processing, Anna Kiefer
Improving Automatic Transcription Using Natural Language Processing, Anna Kiefer
Master's Theses
Digital Democracy is a CalMatters and California Polytechnic State University initia-
tive to promote transparency in state government by increasing access to the Califor-
nia legislature. While Digital Democracy is made up of many resources, one founda-
tional step of the project is obtaining accurate, timely transcripts of California Senate
and Assembly hearings. The information extracted from these transcripts provides
crucial data for subsequent steps in the pipeline. In the context of Digital Democracy,
upleveling is when humans verify, correct, and annotate the transcript results after
the legislative hearings have been automatically transcribed. The upleveling process
is done with the …
Finite Element Analysis Of The Bearing Component Of Total Ankle Replacement Implants During The Stance Phase Of Gait, Timothy S. Jain
Finite Element Analysis Of The Bearing Component Of Total Ankle Replacement Implants During The Stance Phase Of Gait, Timothy S. Jain
Master's Theses
Total ankle replacement (TAR) implants are an effective option to restore the range of motion of the ankle joint for arthritic patients. An effective tool for analyzing these implants’ mechanical performance and longevity in-silico is finite element analysis (FEA). ABAQUS FEA was used to statically analyze the von Mises stress and contact pressure on the articulating surface of the bearing component in two newly installed fixed-bearing total ankle replacement implants (the Wright Medical INBONE II and the Exactech Vantage). This bearing component rotates on the talar component to induce primary ankle joint motion of plantarflexion and dorsiflexion. The stress response …
Design And Analysis Of Zero Voltage Switching Hybrid Voltage Divider, Stephen Ulysses Alvarado Estrada
Design And Analysis Of Zero Voltage Switching Hybrid Voltage Divider, Stephen Ulysses Alvarado Estrada
Master's Theses
This work explores the design, construction, and analysis of a novel DC-DC converter which incorporates combinations of switching capacitors and inductors to achieve an integer voltage divider function, without the need for a feedback loop controller to achieve the desired output voltage. The proposed Hybrid Voltage Divider additionally provides zero voltage switching (ZVS) at turn on transitions which yields improved overall efficiency of the converter. Besides a proof-of-concept via computer simulations, another primary goal of this thesis is to demonstrate the functionalities of the proposed Zero Voltage Switching Hybrid Voltage Divider (ZVS-HVD) through hardware prototyping. The proposed ZVS-HVD was designed …
Effects Of Temperature On Economic Preferences: A Cross-Cultural Laboratory Study Of Prosocial Behavior, Nikita Tkachenko
Effects Of Temperature On Economic Preferences: A Cross-Cultural Laboratory Study Of Prosocial Behavior, Nikita Tkachenko
Master's Theses
In light of the pressing issue of climate change, our study investigates the implications of rising temperatures on social and economic behaviors through a laboratory experiment conducted among students at university sites in Mexico, India, Kenya, Colombia, and the United States. This paper examines the influence of temperature differences and exposure length on economic decision-making among students at university sites in Mexico, Kenya, and the United States. Analyzing data from the dictator game, we explored how temperature, both ambient and wet bulb, and session length affect prosocial behavior. Our results suggest a link between temperature measures and prosocial behavior, with …
Habitat Characterization Of American Badgers (Taxidea Taxus) Of Northern California, Mitchell Victoria
Habitat Characterization Of American Badgers (Taxidea Taxus) Of Northern California, Mitchell Victoria
Master's Theses
American badgers (Taxidea taxus) are a semi fossorial mammal that lives in grassland and open prairie ecosystems as well as coastal prairies, agricultural fields, deserts, and deforested habitats. Many researchers have published work on badgers, but we still require more information on their ecology. The American badger is a semi fossorial, solitary, predatory mammal of grassland ecosystems. They are classified as mesopredators when compared to larger apex predators such as brown bears, wolves, and pumas. However, when larger carnivores are absent, Badgers become apex predators of their ecosystems. Los Vaqueros Watershed in Brentwood, California, was my study site because badgers …
Determining Best Diet And Temperature Regime Of Monkeyface Pricklebacks (Cebidichthys Violaceus) For Aquaculture, Luke C. Townsend
Determining Best Diet And Temperature Regime Of Monkeyface Pricklebacks (Cebidichthys Violaceus) For Aquaculture, Luke C. Townsend
Master's Theses
Wild freshwater eel populations are threatened due to overfishing and habitat degradation. Attempts to use aquaculture to close the eel life cycle have yet to be commercially adapted, owing largely to their complex lifecycle. Monkeyface pricklebacks (Cebidichthys violaceus) are intertidal fish that may serve as an alternative species for freshwater eels in aquaculture, as they possess several beneficial characteristics. This study aimed to optimize diet and culture temperatures to maximize monkeyface prickleback cultures by measuring growth, condition, metabolic rates, fillet composition, and critical thermal maximum (CTmax) of juvenile fish that were reared in two separate experiments: (1) on four different …
Data-Driven Control Of Acoustic Waves Using Movable And Flexible Scatterers, Noam Smilovich
Data-Driven Control Of Acoustic Waves Using Movable And Flexible Scatterers, Noam Smilovich
Master's Theses
Partial Differential Equations (PDEs) serve as fundamental tools in scientific and engineering disciplines, modeling phenomena ranging from material design to climate dynamics. Developing robotic systems capable of controlling PDE-governed systems, particularly when these phenomena are only partially observable, has the potential to drive significant technological advancements. This work presents a framework that leverages physics-informed machine learning (ML) for the control of PDEs. At the core of this approach is an agent equipped with sensors that generate a low-dimensional, physics-informed representation of the environment, enabling the derivation of optimal sparse control policies for the agent’s actuators. The focus is on manipulating …
Thermal Runaway Analysis And Cooling Strategies For Nmc 523 Li-Ion Battery Packs Using Pcm, Heat Pipes, And Air Cooling, Vijethvardhan Singh
Thermal Runaway Analysis And Cooling Strategies For Nmc 523 Li-Ion Battery Packs Using Pcm, Heat Pipes, And Air Cooling, Vijethvardhan Singh
Master's Theses
The growing demand for electric vehicles (EVs) necessitates efficient thermal management of lithium-ion batteries (LIBs), especially NMC 523 cells. This thesis investigates thermal runaway (TR) mechanisms and evaluates cooling strategies to mitigate overheating risks. Using ANSYS Fluent, the TR of four cells in series was simulated and validated with Jun Wu et al.'s experimental data, achieving an error margin below 10%. Peak temperatures reached 1,126°C in the first cell, with delayed propagation in adjacent cells. Sensitivity analysis of voltage, current, and state of charge (SOC) under varying C-rates was performed using a multi-scale multi-domain (MSMD) battery model. A logarithmic voltage …
Assessing The Effectiveness Of Non-Traditional Climate Change Communication Tools In The City Of Santa Cruz, Saara Ranabhat
Assessing The Effectiveness Of Non-Traditional Climate Change Communication Tools In The City Of Santa Cruz, Saara Ranabhat
Master's Theses
Coastal cities face significant challenges from climate-induced coastal hazards. The City of Santa Cruz is a medium-sized municipality in Monterey Bay on California's Central Coast with over $1 billion worth of property and infrastructure at risk to climate-induced coastal hazards by 2100. However, city officials have noticed a lack of representation of climate-vulnerable communities in the development of various climate adaptation plans and policies. In order to remedy this problem, the City is experimenting with various climate change communication tools, such as virtual reality (VR), card games, murals, and comic books, in collaboration with different agencies. But limited understanding exists …
The Impact Of Video Game Play On Attention And Perception, Krish Pradhan
The Impact Of Video Game Play On Attention And Perception, Krish Pradhan
Master's Theses
Past research shows that individuals who play action video games have stronger attentional resources. However, the role of expertise and player experience is yet to be operationalized in cognitive video game research. This thesis aimed to discover if there is a systematic relationship between video game expertise, specifically percentile-based ranks and actual hours played, on perception and attentional skills. Percentile-based rankings were used as a new, objective measure of expertise that accounts for an individual's skill level relative to all other players of the same game. The number of weekly hours played was gathered from the participants and divided into …
Use Of A California Wetland: Harbor Seal (Phoca Vitulina) Haul-Out Patterns In Elkhorn Slough, Emma Nicholson
Use Of A California Wetland: Harbor Seal (Phoca Vitulina) Haul-Out Patterns In Elkhorn Slough, Emma Nicholson
Master's Theses
This project investigated small-scale habitat use patterns of harbor seals (Phoca vitulina). The goals were to provide an updated overview of the harbor seal population in Elkhorn Slough, California, USA, identify haul-out areas that are seasonally relevant for pupping and molting, and analyze environmental factors that may influence the harbor seals’ abundance and distribution in the slough. Seal counts were conducted by Elkhorn Slough volunteers throughout the entire slough June 2020-May 2023. Additional survey data at the 5 most populated haul-out sites were collected by volunteers from MLML April 2022-May 2023. A comparison to harbor seal abundance data from 1991-1992 …
The Relationship Between Communication With Coworkers And Job Satisfaction Among Teleworkers: The Moderating Role Of Communication Modality, Madison L. Mariano
The Relationship Between Communication With Coworkers And Job Satisfaction Among Teleworkers: The Moderating Role Of Communication Modality, Madison L. Mariano
Master's Theses
Teleworking has become increasingly prevalent due to public health concerns and advancements in communication technologies. While organizations should take steps to promote job satisfaction among teleworkers, there is little research on the predictors of job satisfaction among full-time teleworkers. Specifically, few studies have focused on how coworker communication might impact job satisfaction among full-time teleworkers. This study focused on this gap in the literature by examining the relationship between the frequency of communication with coworkers and job satisfaction and the moderating role of communication modality. Communication modality refers to a form of communication technology available to teleworkers, ranging from rich …
Justice And Equity In Urban Water Allocations And Conservation Solutions: A Case Study Of Non-Traditional Housing Dwellers, Matthew J. Mangoni
Justice And Equity In Urban Water Allocations And Conservation Solutions: A Case Study Of Non-Traditional Housing Dwellers, Matthew J. Mangoni
Master's Theses
Access to water is a human right. With droughts becoming more frequent and severe, equitable and just access to fresh water is a critical concern for policymakers and regulators. Allocation-based (AB) water rates are used widely to incentivize conservation. Previous authors document benefits of this approach for single family homes (SFH) in urban areas. People living in homeowners’ associations (HOAs) or multi-family homes and renters – commonly grouped as non-traditional housing (NTH) tend to face barriers to understanding or controlling water use and costs. This thesis investigates the equity and effectiveness of 1) AB water rate structuring and 2) a …
Unrealvision: A Synthetic Dataset Generator For Human-Pose Estimation And Behavior Analysis, Thinh Lu
Unrealvision: A Synthetic Dataset Generator For Human-Pose Estimation And Behavior Analysis, Thinh Lu
Master's Theses
For over a decade, computer vision (CV) has become an indispensable component of numerous camera surveillance applications as well as intelligent autonomous systems. Thanks to new advances in AI, Edge Computing, and IoT technologies, there is now a rapidly growing number of smart camera devices, industrial and consumer robots that are using computer vision for various applications - from human tracking and analysis, object classification, to visual inspection and anomaly detection. For most common use cases, building vision-based applications can be a straightforward and affordable task thanks to the increasing number of publicly accessible datasets and research publications. However, it …
Unveiling The Cognitive Impact: An Exploratory Study On Food Insecurity And Value-Driven Attentional Capture, Nichole S. Hogoboom
Unveiling The Cognitive Impact: An Exploratory Study On Food Insecurity And Value-Driven Attentional Capture, Nichole S. Hogoboom
Master's Theses
Food insecurities have been shown to lead to serious negative health outcomes such as increased risk for diabetes and obesity in adulthood, food-related mental health and behavioral issues, all of which can have a crossover effect in many areas of a person’s life. This experiment explores whether previous history of food insecurity is associated with how people allocate attention to pictures of food; whether they are prioritizing or ignoring food stimuli in their environment. We hypothesized that the severity of food insecurity experienced in childhood would correlate with attentional bias towards food images, and that how hungry or thirsty participants …
Uncovering Weaknesses In Autonomous Driving: A Formal Approach To Adversarial Scenario Generation And Falsification, Carlos O. Hernandez
Uncovering Weaknesses In Autonomous Driving: A Formal Approach To Adversarial Scenario Generation And Falsification, Carlos O. Hernandez
Master's Theses
Autonomous vehicles utilize advanced safety features like proactive driving assistance and pre-collision alerts to minimize the risk of accidents. However, evaluating the correct functionality of these systems is complex. First, safety systems are highly sophisticated, integrating software, networking, and hardware components, many of which rely on advanced artificial intelligence and machine learning algorithms. Second, an array of dynamic factors, including numerous actors and physical variables, can influence the performance of safety mechanisms during critical scenarios. Each actor’s unique behavior introduces unpredictability, making it difficult to anticipate future states and outcomes. This thesis presents a comprehensive framework for testing autonomous vehicle …
Synthesizing Physiology With Aquaculture For Olympia Oyster Restoration In Elkhorn Slough, Ca, Jacob Harris
Synthesizing Physiology With Aquaculture For Olympia Oyster Restoration In Elkhorn Slough, Ca, Jacob Harris
Master's Theses
Conservation aquaculture is an emerging restoration strategy for depleted and low-density foundation species. It was recently applied for Olympia oysters in California. The only native oyster species is at risk of local extinction in much of its range. Conservation aquaculture can support oyster abundance, but long-term restoration success will be constrained by habitat conditions that suppress early growth and reproductive fitness. Following years of reproduction failure in Elkhorn Slough, CA, we examined these two critical life stages: juvenile and brooding. Our aim was to improve restoration by evaluating aquaculture methods and studying their physiology. We tested site parameters, oyster size, …