Digital Commons Network^™

Expeditionary Ocean Power Generator, Otto Jacob Van Willigen, David Scott Nyberg, Logan Christopher Schilling, Kyle James Hohman, Travis Michael Eccher

Mechanical Engineering

The Expeditionary Ocean Power Generator (ExOPG) project is a point absorber wave energy converter developed by a team of five mechanical engineering seniors at California Polytechnic State University in partnership with NAVFAC EXWC. Designed to support U.S. Marine Corps operations, the device aims to reduce the reliance on diesel generators by generating and storing up to 100 watts of power from ocean waves in a sturdy and self-sufficient device.

The ExOPG device uses a rack and pinion mechanism driven by vertical wave motion to convert mechanical energy into electrical energy via a generator, which is then processed and stored by …

Evaluation Of Damages And Economic Losses In Light-Frame Timber Houses, Mason P. Leonard

Master's Theses

This thesis aims to evaluate the damages and economic losses in light-frame timber houses by designing and constructing a two-story, full-scale, fully equipped, code conforming timber assembly. Specifically, the structure will be analyzed based on how the non-structural components (NSC) like gypsum wallboard, interior doors, windows, and sliding patio doors as well as structural components like light-frame timber shear walls impact the economic losses.

Damage limit states were obtained from the Federal Emergency Management Agency (FEMA) P-58, Performance Assessment of Buildings to extract at what inter-story drift (ISD) ratio each damage limit state was expected to occur at. Fragility and …

Single-Sideband Pulse Width Modulation For Parametric Acoustic Arrays, Douglas Liu

Master's Theses

Parametric acoustic arrays are directional loudspeakers that operate using ultrasonic carriers to project sound within a narrow beam. Input audio is first modulated onto an ultrasonic carrier and transmitted through air, where it self-demodulates into audible frequencies in the far field.

This thesis introduces a method for preprocessing audio into scaled quadrature signals using a passive analog polyphase filter. These signals are modulated using microcontroller-generated waveforms to create quadrature ultrasonic pulse-width modulation (PWM) signals. The modulated outputs are combined through a wired-OR summer, producing single-sideband ultrasonic content at the desired frequency of 40 kHz. This signal is amplified through high-efficiency …

Machine-Checked Proofs For Correctness Guarantees In Containment Architectures, Sophie Russ

Master's Theses

Modern computing systems are increasingly susceptible to attacks at the hardware and software levels. Formal methods offer promising guarantees as to the correctness and security of systems. However, these methods tend to scale poorly and are thus insufficient to protect complex systems. Leveraging minimal amounts of trusted hardware and software to ensure the security of whole systems is a promising approach to gain the benefits of formal methods without having to overcome the scaling problem. TrustGuard realizes this approach: a containment architecture model that requires all outgoing communication from the host computer to be validated by a small, external hardware …

Topodino: Self-Supervised Topological Representation Learning For Neuronal Morphologies, Yasser Binbisher

Master's Theses

Neuronal cell types are categorized by transcriptomic identity, yet their morphological heterogeneity defies this classification. In response, researchers have adopted unsupervised graph representation learning as a tool to reveal morphological variation within single-class transcriptomic types. However, the complex geometry of neuronal morphology—especially long axons and dense dendrites—challenges graph neural networks, which struggle with message propagation across extended structures. To mitigate this, current approaches enforce sub-sampling on neuronal graphs and omit axons entirely, sacrificing critical biological features for computational efficiency. To overcome this trade-off, this thesis introduces TopoDINO, a self-supervised, topology-aware representation learning model designed to preserve the full hierarchical organization …

Characterization Of Indoor Air Quality And Thermal Comfort Of University Classrooms, Andrew Sugamele

Master's Theses

Indoor air quality (IAQ) significantly affects cognitive performance, yet many older buildings at Cal Poly, such as Building 20, struggle to maintain healthy indoor environments due to outdated ventilation systems. This thesis aims to identify issues and provide suggestions on how we can improve the learning environment to improve student success within Building 20. Temperature, relative humidity, and carbon dioxide (CO₂) concentration inside Building 20 were measured from January to April 2025. To determine the effects of different ventilation strategies, a model of Building 20, room 128, was developed and validated using DesignBuilder. Additionally, ventilation rates were measured …

Exploiting Compiler-Introduced Vulnerabilities In C: A Cross-Compiler And Cross-Architecture Analysis Of Undefined Behavior, Erik Mccutchen

Master's Theses

Compilers are a critical component in generating secure software across engineering disciplines. However, languages like C that permit undefined behavior introduce a fundamental tension between the compiler’s interpretation of undefined behavior and the security of the generated code. This tension can result in security vulnerabilities that, from the programmer's perspective, are ``created'' by the compiler. The widespread use of these languages, combined with the complexity of modern optimizations and limited developer visibility into compiler behavior, makes these vulnerabilities both pervasive and difficult to detect.

Building on prior work, this thesis refines a dataset of C code snippets that exhibit Compiler-Introduced …

Design, Analysis, And Implementation Of An Improved Zero Voltage Switching Hybrid Voltage Divider, Luke V. Cerda

Master's Theses

This thesis entails the study, design, and construction of a novel DC-DC converter topology, the Zero Voltage Switching Hybrid Voltage Divider (ZVS-HVD), with improved modularization, optimization, and compactness. The ZVS-HVD facilitates higher load currents and accomplishes DC-DC voltage division through switching inductors and capacitors. Low switching loss is achieved through zero voltage switching (ZVS) and the use of GANFET switches. An analysis of duty cycle and high-frequency operation is conducted, enabling 1 MHz switching and improvements in output voltage ripple, voltage drooping, board size, and efficiency at higher load currents. Two versions of ZVS-HVD prototypes were constructed with on-board signal …

Frequent Itemset Mining With Tidyclust In R, Andrew D. Kerr

Master's Theses

Unsupervised learning is closely associated with clustering, however other methods fall under this umbrella such as data mining. In R, the tidyclust package provides a unified interface for clustering models, yet lacks support for data mining. This thesis addresses this gap by introducing the Apriori and ECLAT algorithms into tidyclust, with a focus on frequent itemset mining. Unlike traditional clustering models, frequent itemsets produce groupings of column variables, rather than cluster labels or partitions of observations. To address this, a novel clustering approach is proposed: items (columns) are grouped based on their ”dominant” frequent itemset. A key contribution is a …

Floating Wind Turbine Foundation, Clayton Lahodny, Dillon Nelson, Trevor Ortega, Andrew Cervantes

Mechanical Engineering

The 2024 Collegiate Wind Competition (CWC) has introduced a new element to their Turbine Design Competition: a floating foundation. In previous years, foundations have been fixed-bottom in a box of sand and water. The Cal Poly Wind Power Club, who competes in the CWC every year, requires a floating foundation to be designed, manufactured, and tested to assist in winning the competition. The foundation is a large, hollow, cylindrical barge with a hanging spar (heavy mass). The barge will provide a restoring moment using buoyancy, and the heavy spar provides additional restoring moment. Four cables will be attached at the …

Hydropower Collegiate Competition, Aiden D. Foster, Devon Bountry, Joanna Vo, Timothy Rinker, Amanda Rodriguez, Minh Nguyen, Eli Haushalter, Sophie Watkinson, Maiya Holton, Breanne Evans

Mechanical Engineering

The Cal Poly SLO HCC team presents a feasibility study and engineering design review package for retrofitting the non-powered Ritschard Dam in Colorado into a hydroelectric facility as part of the 2025 Hydropower Collegiate Competition. Through a rigorous and multi-staged assessment of plausible dam sites in the western US, the team has chosen the Ritschard Dam in Colorado to implement an electromechanical component designed to accommodate a large range of flowrates stemming from a large variance in upper reservoir capacity due to geographical and climate effects. The team evaluated non-powered dams based on technical feasibility, electric grid proximity, power generation …

Structural Color Pigments For Waterborne Coatings, Kyle William Liston

Master's Theses

Structural colors offer unique alternatives to conventional pigments, utilizing their microstructures to produce vibrant colors. These pigments offer an alternative source for colorants without the need for less environmentally friendly conventional pigments. In keeping with the sustainability approach, the use of waterborne coatings was chosen over solvent-based coatings. Here we report the synthesis of brushite platelet, silica supraball, and inverse opal pigments. Brushite platelets were produced through a condensation reaction, while silica supraballs were synthesized via the Stöber process and assembly was attempted using an oil-in-water emulsion. Inverse opal was produced through the templating of silica on poly(methyl methacrylate) (PMMA) …

Functionalization Of A Calcium-Based Squaric Acid Metal Organic Frameworks With Amine-Based Polymers For Enhancing Post Combustion Carbon Capture, Corinne D. Watson

Master's Theses

The primary driver of climate change is the release of carbon dioxide (CO₂) from fossil fuel combustion. Global climate change has resulted in sea level rise, adverse weather patterns, and countless other negative global effects. Several carbon-reduction frameworks emphasize the transition to clean energy sources; however, other strategies must be concurrently pursued to immediately and effectively reduce atmospheric carbon dioxide point source emissions. Metal organic frameworks (MOFs) are a promising new technology for post-combustion carbon dioxide capture. The materials are synthesized using organic linker molecules and metal ion joints. Notably, there are several challenges with various types of …

Tanzania Mbesese Initiative 2025, Genevieve Marie Tedder, Frances Street, Audrey Wojcik, Alex Trujillo, Tristen Mullin, Jessica Jane, Anna Marie Langer, Carissa Castro, Molly Linong Rojec, Haley Pilcher

Architectural Engineering

The Tanzania Mbesese Initiative is an ongoing project based in Same, Tanzania. The Mbesese Initiative for Sustainable Design (MISD) is working in collaboration with ARUP and Cal Poly to develop a polytechnic college for the community in Same. Our team of ten students aims to support the design and construction process of the project.

Outdoor Exercise Area Renovation, Hagan T. Jackson, Chet S. Crummett, Jesse E. Muth

Architectural Engineering

The Outdoor Exercise Area Renovation project revitalizes a well-used outdoor exercise area located near the baseball fields at Cal Poly. The existing exercise equipment, originally donated by Maino Construction, was weathered, but the area remained well-utilized and presented potential for revitalization. This project transforms the site into a functional and resilient space by replacing the pull-up and dip bar equipment, constructing a 300 square foot pavilion, and adding a concrete slab and integrated concrete benches. The new design enhances usability, providing a multifunctional area for the Cal Poly community to exercise, socialize, relax, and enjoy scenic views.

The renovated area …

Tettoia Iperbolica, Lydia Chou, Jack L. Walsh, William Jasper Mors, Simarjot S. Gandhoke, Ian F. Da Silva, Jamie L. Zimmerman

Architectural Engineering

Tettoia Iperbolica (Hyperbolic Canopy) is a multidisciplinary senior project created to revitalize an underutilized outdoor space next to the Architectural Engineering Building 21 at Cal Poly. The project responds to needs identified by faculty and staff, including limited gathering space, inadequate shading for the adjacent conference room, poor drainage, and a lack of ADA accessibility. Building on two previous senior project efforts, the 2025 team advanced the concept into a fully designed, structurally stamped, permitted redwood canopy supported by existing concrete columns and one new steel column.

The work included extensive site investigation to verify subsurface conditions, concrete strength testing, …

Untold Stories Bench Project, Elijah Labb

Architectural Engineering

No abstract provided.

Cementing Co2 Into C-S-H: A Step Toward Carbon Neutrality, Or A Step In The Wrong Direction?, John Reilly Benn, Tahne Larson

Architectural Engineering

As greenhouse gas emissions continue to rise, many in the construction industry are looking for sustainable solutions to reduce its carbon footprint. One of the biggest contributors to atmospheric CO2 comes from cement production. In 2023, researchers at MIT explored ways to enhance concrete’s natural ability to act as a carbon sink. Concrete does this unassisted through a chemical reaction called carbonation, by which atmospheric carbon bonds to key components in cement. The researchers at MIT proposed a process of early-stage forced carbonation, which can be induced by the addition of NaHCO3 into a standard concrete mix. Sodium bicarbonate, or …

Physical Construction Of 1/2 Scale Concrete Wall, Alicia Danielle Lee, Cali Jeanne Carson

Architectural Engineering

This senior project was the physical construction and material testing of the half-scale reinforced concrete wall specimens. This included all stages of the building process, from formwork and reinforcement to concrete placement and laboratory testing.

The Xenaform, Cassadie J. Golding

Architectural Engineering

The XenaForm explores how complex, expressive structures can emerge from simple, low-tech construction methods using principles of parametric design and structural geometry. By combining folded plate techniques with modular tetrahedral components, the project bridges high-tech digital modeling and hands-on physical fabrication. The result is a lightweight, buildable system that reclaims the engineer’s role as a form-finder.

Practical Integration Of Reality Capture In Architecture, Engineering, Construction, And Operations (Aeco) Workflows: Cost And Application Considerations, Dylan T. Ramsey

Architectural Engineering

This paper explores the practical integration of Reality Capture (RC) technologies, specifically LiDAR and photogrammetry, within Architecture, Engineering, Construction, and Operations (AECO) workflows. As interest in RC grows, costs decrease, and industry applications expand, this paper aims to clarify the current landscape of research, industry practices, hardware, and software. It provides managers, RC technology enthusiasts, and AECO professionals considering its implementation with essential insights into cost considerations, expectations, and limitations. The paper details common research and industry applications, including as-built documentation, surface analysis, and deflection monitoring, and cross-references cost data and project requirements to provide informed recommendations and considerations for …

C.H.I.I.P., Continuous Health Information For Infrastructure Protection, Lariel Sasha Henley

Architectural Engineering

This paper presents the development and validation of CHIIP (Continuous Health Information for Infrastructure Protection), a wireless structural health monitoring (SHM) device designed to provide accessible, real-time data on structural performance of building structures following a seismic event. The system integrates inclinometers, accelerometers, linear potentiometers, and strain gauges with ESP32 microcontrollers to create a compact and robust data collection device that can transmit synchronized sensor data via Wi-Fi to a remote server. A web-based interface enables users to access and download live data for rapid structural evaluation. The device was tested in three phases: a small-scale wired baseline test, a …

Concrete Mix Designs With Shrinkage Reducing Admixture, Beau Usry, Julio Munoz Tanaka

Architectural Engineering

The goal of this project was to explore how shrinkage-reducing admixtures (SRAs) affect the strength and overall performance of concrete. While SRAs are typically used to help reduce shrinkage and cracking, it is less common to see how they might affect compressive strength directly. To test this, three different concrete mixes were made: a control mix with no admixture, one mix with 1% SRA, and another with 3% SRA. The idea was to compare how each mix performed under the same testing conditions.

Architectural Engineering Institute: International Student Design Competition 2025, Alexandra Marie Kersting, Alec Thomas Gibbs, Haley Francesca Sousa, Kline Genevieve Nickel

Architectural Engineering

The AEI International Student Design Competition is an annual competition held by the Architectural Engineering Institute that aims to replicate an integrated building design process. The 2025 Cal Poly team consisted of 4 Architectural Engineering students, each competing in the Structural and Integration disciplines. The team was provided a set of architectural drawings and a 3D architectural Revit model of Carson Headquarters in Omaha, Nebraska. The team was tasked with the creation of a complete structural design as well as a discussion of integration of other building design disciplines.

Modal Analysis Of Cal Poly’S Kennedy Library Using Computational Modeling, Joseph Mangan

Architectural Engineering

This project determines the modal parameters of the Robert E. Kennedy Library at Cal Poly, San Luis Obispo using ETABS. Similar analyses on the building have been performed in the past by other Architectural Engineering students. The recent renovation of the library which included a seismic retrofit provides the opportunity to understand how the modal response of concrete structures can be influenced by retrofit practices. This project provides insight into how computational modeling can be used to accurately represent real conditions, and how isolated changes from the retrofit affect the structure’s modal response.

Thousand Hills Pet Resort Cat Condos Installation And Qa/Qc, Erik Anders Ruud

Construction Management

This paper discusses the installation and quality assurance/quality control of four cat condos built for the Son Care Foundation at the Thousand Hills Pet Resort in San Luis Obispo. The Son Care Foundation is a nonprofit that provides professional daycare and overnight boarding services for dogs and cats while their owners are away. The cat condos serve cats during the day while their owners are at work or otherwise busy. Because three people were assigned to this project, the project was split into preconstruction, prefabrication, and installation/QA/QC. To meet the two-day installation window, due to active facility use, three cat …

Exploring Who, Where, And When: A Mixed-Methods Analysis Of A New Study Abroad Program, Garrett Schoep, Elijah Duane Blake

Construction Management

Study abroad programs can have a significant impact on the lives of college students. These programs create opportunities for students to experience the world, while earning college credit. As Cal Poly is transitioning from the quarter system to the semester system, there is an increase demand for a new study abroad program that is tailored to students’ preferences. Understanding what students want from a study abroad program is extremely important. To better understand student preferences, a survey was created and distributed to Cal Poly students. The goal of the survey was to identify trends amongst students to get a better …

Preconstruction Management Of The Cat Condos Project At Thousand Hills Pet Resort, Aeon Combs

Construction Management

This paper presents the preconstruction phases of the Cat Condos Project at the Thousand Hills Pet Resort, and the many challenges which were necessary to realize its completion. The Son Care Foundation is a nonprofit organization based in San Luis Obispo with many focuses such as outreach for veterans, prison rehabilitation, youth development, and other charitable pursuits. The Thousand Hills Pet Resort is a subsidiary of the Son Care Foundation which provides holistic boarding services to felines and canines alike, all the profits generated by the Thousand Hills Pet Resort are donated to sustain the Son Care Foundations’ charitable endeavors. …

Analyzing Copyrightability Of Ai-Generated And Assisted Works Under A New Theory Of Authorship, Katherine Lu

Journalism

While pending cases like the New York Times’ case against OpenAI will be the first test for artificial intelligence (AI) in the copyright space, current copyright legislation inadequately answers questions regarding grey-area uses of generative AI in the creation of journalistic, creative, or academic works. The Copyright Office has established that copyright requires human authorship, but current legal definitions of authorship may include simple prompt writing as a form of authorship. This paper addresses the inadequacies of the current definitions of authorship, and proposes a new one that encompasses traditional definitions, the Copyright Office’s new motions addressing AI, and Christopher …

Degradation Characterization Of Nopal-Based Biopolymer Made From Opuntia Sp. Juice, Beeswax, Animal Protein, And Polyvinyl Alcohol, Logan Williams, Mary Elizabeth Holland, Spencer Williams

Materials Engineering

Since the introduction of polymers in the 1960s, there has been an exponential increase in use. Driven by rapidly growing demand, the volume of polymers in the production, application, and end-of-life stages has surged. The widespread use of these materials has led to escalating environmental pollution, which disrupts ecosystems, and contributes to global ecological degradation. While advancements in recycling technologies and infrastructure have shown promise, they have not maintained pace with polymer production and disposal. This imbalance warrants research into sustainable alternatives. Environmentally benign polymers derived from renewable sources and exhibiting minimal ecological impact at the end of their life …