Engineering Commons^™

Cooperative Navigation Of Autonomous Vehicles In Challenging Environments, Brendon Peter Forsgren

Theses and Dissertations

As the capabilities of autonomous systems have increased so has interest in utilizing teams of autonomous systems to accomplish tasks more efficiently. This dissertation takes steps toward enabling the cooperation of unmanned systems in scenarios that are challenging, such as GPS-denied or perceptually aliased environments. This work begins by developing a cooperative navigation framework that is scalable in the number of agents, robust against communication latency or dropout, and requires little a priori information. Additionally, this framework is designed to be easily adopted by existing single-agent systems with minimal changes to existing software and software architectures. All systems in the …

Correlative Imaging Of Three-Dimensional Cell Culture On Opaque Bioscaffolds For Tissue Engineering Applications, Mone’T Sawyer, Josh Eixenberger, Olivia Nielson, Jacob Manzi, Cadré Francis, Raquel Montenegro-Brown, Harish Subbaraman, David Estrada

Materials Science and Engineering Faculty Publications and Presentations

Three-dimensional (3D) tissue engineering (TE) is a prospective treatment that can be used to restore or replace damaged musculoskeletal tissues, such as articular cartilage. However, current challenges in TE include identifying materials that are biocompatible and have properties that closely match the mechanical properties and cellular microenvironment of the target tissue. Visualization and analysis of potential 3D porous scaffolds as well as the associated cell growth and proliferation characteristics present additional problems. This is particularly challenging for opaque scaffolds using standard optical imaging techniques. Here, we use graphene foam (GF) as a 3D porous biocompatible substrate, which is scalable, reproducible, …

Near Peer Pedagogies For Culturally Sustaining Computer Science And Mathematics, Cliff Freeman, Eli Tucker-Raymond, Juan Gutierrez

Journal of Computer Science Integration

In this study, College STEM Literacy Workers act as co-teachers in 9th and 10th grade classrooms alongside mathematics teachers as they both learn to integrate a 30-hour integrated computer science/mathematics curriculum. As part of the curriculum for educator learning, we adapted the Algebra Project’s “Model of Excellence” for culturally relevant-sustaining pedagogies. We used the framework to explore how teachers understand College STEM Literacy Workers’ contributions in the model as well as College STEM Literacy Workers’ own experiences in the classroom. We found that while teachers and College STEM Literacy Workers did not individually instantiate the model of excellence, they were …

Fatigue Behavior Of Cu-Zr Metallic Glasses Under Cyclic Loading, Nikolai Priezjev

Mechanical and Materials Engineering Faculty Publications

The effect of oscillatory shear deformation on the fatigue life, yielding transition, and flow localization in metallic glasses is investigated using molecular dynamics simulations. We study a well-annealed Cu-Zr amorphous alloy subjected to periodic shear at room temperature. We find that upon loading for hundreds of cycles at strain amplitudes just below a critical value, the potential energy at zero strain remains nearly constant and plastic events are highly localized. By contrast, at strain amplitudes above the critical point, the plastic deformation is gradually accumulated upon continued loading until the yielding transition and the formation of a shear band across …

Design And Development Of Clinical Decision Support System For Breast Cancer Diagnosis Using Artificial Intelligence, Karthiga R

Theses and Dissertations

The prevalence of breast cancer in women worldwide is far higher than that of cancers of the lungs, brain, or liver. Increasing ageing populations and poor lifestyle habits among the general public, primarily in industrialized nations, are significant factors contributing to the rise in cancer-related mortality rates worldwide. Approximately one woman in every three will develop breast cancer. This research proposes several advanced computer methods for analyzing breast cancer images. This work analyses breast cancer in four imaging modalities: mammography, thermography, ultrasonography and histopathology.

Each modality has some limitations in diagnosing tumors in the breast region. Heavy dose in mammogram …

Dynamic Skin Strain Fields In The Lumbar Region During Functional Movement, Andrew Gibbons, Anton Bowden, Ulrike H. Mitchell, David T. Fullwood

Student Works

Increasing efforts to leverage skin mounted wearables has exposed a gap in our understanding of skin strain in the lumbar region. Lumbar skin is known to be both inhomogenous and anisotropic, and experiences dramatic material strain during activities of daily living (ADLs). Previous efforts to quantify strain fields during ADLs has been limited to a few activities (primarily flexion) and have neglected inhomogeneity or anisotropy. The purpose of the present work was to address this gap by measuring large-deformation skin strain tensors in healthy volunteers during a cadre of functional movements.

36 tightly packed retro-reflective markers were mounted to the …

Risks From Spacecraft Breakup Events In Near Rectilinear Halo Orbits, Nathan R. Boone, Robert A. Bettinger, Bryan D. Little

Faculty Publications

Spacecraft breakup events were simulated in the vicinity of the Lunar Gateway’s Near Rectilinear Halo Orbit to evaluate the risk of debris collision with the station. The Monte Carlo simulations model the breakup of an object shortly after deployment from the Gateway, and using the propagated trajectories of over a million particles across 5,000 random breakup events, the likelihood of collision with the Gateway is statistically evaluated. Approaches within 10 km were observed for only 2.4% of the breakup events, suggesting a low risk of collision, but approaches at larger distances that might still generate a debris avoidance maneuver were …

Bridging The Gap Between Academic Research And Reduction To Practice: Manufacturing Scale-Up Of Polymeric Membranes For Water Treatment, David Lu, Isabel C. Escobar

Kentucky Water Resources Annual Symposium

No abstract provided.

Modeling, Managing, And Mitigating Stormwater Flooding Using A Real-Time Monitoring Network And Environmental Equity Approach, Ben Hauschild, Jason S. Polk, Trayson Lawler, Adam Desloge

Kentucky Water Resources Annual Symposium

No abstract provided.

Stormwater Management Advances Using Smart Sensing Network Architecture For Precipitation Monitoring, Brittany Pekara, Jason S. Polk, James Adam Shelley

Kentucky Water Resources Annual Symposium

No abstract provided.

Development Of A Spatial And Statistical Diagnostic Tool To Prioritize Pfas Sample Locations In Kentucky Surface Waters, Ariel Robinson, Angela Gutierrez, Kelly G. Pennell

Kentucky Water Resources Annual Symposium

No abstract provided.

A Flood Of Consequences In Louisville, Kentucky: Using Hgis To Track Refugees Impacted By The 1937 Ohio River Flood, Trevor Harry, Margaret M. Gripshover

Kentucky Water Resources Annual Symposium

No abstract provided.

Sewer Gas, Siphons And Long-Term Stewardship For Community Interventions, Hong Cheng Tay, Kelly G. Pennell

Kentucky Water Resources Annual Symposium

No abstract provided.

Perceptions And Visual Awareness Of Urban Karst Flooding To Inform Preparedness Planning And Management Actions, Grace Herrmann, Jason Polk

Kentucky Water Resources Annual Symposium

No abstract provided.

Contaminant Transport Mechanisms And Source Tracking In Karst Groundwater Systems Under Agriculture Land Use, Shreya Pandley, Jason S. Polk

Kentucky Water Resources Annual Symposium

No abstract provided.

Identifying Controls On Sediment Hysteresis Patterns Using Interpretable Machine Learning, Arlex Marin-Ramirez, David Tyler Mahoney, Brendan Riddle, Leonie Bettel, James Fox

Kentucky Water Resources Annual Symposium

No abstract provided.

Modifying The Cop Karst Groundwater Vulnerability Model Using Spring Storm Response, Benjamin Tobin, Sara Arpin, Solomon Nketsia, Chelsea Parada, Maaz Fareedi, Will Hemenover, Charlies Taylor

Kentucky Water Resources Annual Symposium

No abstract provided.

Exploring Water Quality On The Reclaimed Surface Mines Lands In Eastern Kentucky, Whitney Tara Maynard, Buddhi Gyawali, George Antonious

Kentucky Water Resources Annual Symposium

No abstract provided.

Modeling Moisture Content Variations In The Shallow Subsurface Soil Under Rainfall Infiltration And Different Atmospheric Conditions, Omid Ghasemi-Fare, Mohammadreza Mir Tamizdoust, Fereydoun Najafian Jazi, Amin Mohammadzadeh, Tom Rockaway

Kentucky Water Resources Annual Symposium

No abstract provided.

Karst Watershed Planning For The Jennings Creek/Lost River Watershed In South-Central Kentucky To Improve Water Quality And Community Awareness, Jason S. Polk, Adam Desloge, Brittany Pekara, Trayson Lawler, Shreya Pandey, Kara Brunot, Mara Neace, Meghan Forbes, Matt Powell

Kentucky Water Resources Annual Symposium

No abstract provided.

River And Conduit Stage Tomography For Characterizing Karst Aquifers, Junfeng Zhu, Steven Webb, James Fox

Kentucky Water Resources Annual Symposium

No abstract provided.

Antibiotic-Resistant E.Coli In Kentucky Watersheds Impacted By Various Land Uses, Jayden Hamlet, Jason Marion, Travis Altheide

Kentucky Water Resources Annual Symposium

No abstract provided.

Investigating The Impact Of Stream Restoration On Sediment Transport At A Karst Spring Using Hydrograph Unmixing, Sediment Transport Modeling And Multi-Source Hysteresis, Leonie Bettel, Jimmy Fox, Admin Husic, Tyler Mahoney, Arlex Marin, Zunfeng Zhu, Benjamin Tobin, Nabil Al Aamer, Chloe Osborne

Kentucky Water Resources Annual Symposium

No abstract provided.

Methane Dynamics Of Kentucky Bottomland Hardwood Forested Systems, Marissa Miles, Jessica B. Moon, Skylar Ross, Jarred Asselta, Niklas Klauss, Rosie Carey, Kabi Raj Khatiwada, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle

Kentucky Water Resources Annual Symposium

No abstract provided.

A Critical Review Of Vegetation Issues In So-Called “Stream Restoration” On Daniel Boone National Forest, Julian J. N. Campbell

Kentucky Water Resources Annual Symposium

No abstract provided.

Floating Vegetation As A Driver Of Ch4 Emissions In Small Ponds Across Louisville, Ky, Mark Tierney, C. Jalink, J. H. Loughrin, S. W. Antle, Andrew S. Mehring

Kentucky Water Resources Annual Symposium

No abstract provided.

Measuring The Contribution Of Bald Cypress “Knees” To Greenhouse Gas Emissions During Climate Extremes, Skylar Ross, Jessica B. Moon, Niklas Klauss, Marissa Miles, Kabi Raj Khatiwada4, Bassil El Masri, Gary Stinchcomb, Benjamin R. K. Runkle

Kentucky Water Resources Annual Symposium

No abstract provided.

Impacts Of Land Use And Groundwater Inputs On Biological Stream Health And Habitat Of Jennings Creek, Bowling Green, Kentucky, Allison Francis, Jason S. Polk

Kentucky Water Resources Annual Symposium

No abstract provided.

The Role Of Beavers In Mediating Short-Term Organic Matter Accretion In Kentucky Acep Wre Easements, Jessica B. Moon, Marissa Miles, Logan Firkins, Karen A. Baumann, Michael B. Flynn

Kentucky Water Resources Annual Symposium

No abstract provided.

Characterizing Louisville Wetlands From Above And Below To Better Predict Wetland Carbon Sink-Source Status, Andrea E. Gaughan, Andrew S. Mehring, Mark Tierney, David Brown, Kassidy Haynes, Madison Cicha

Kentucky Water Resources Annual Symposium

No abstract provided.