Engineering Commons^™

Advances In Additively Manufactured Titanium Alloys By Powder Bed Fusion And Directed Energy Deposition: Microstructure, Defects, And Mechanical Behavior, Hongyi Y. Ma, J. C. Wang, Peng Qin, Y. J. Liu, L. Y. Chen, L. Q. Wang, Laichang Zhang

Research outputs 2022 to 2026

Ti and its alloys have been broadly adopted across various industries owing to their outstanding properties, such as high strength-to-weight ratio, excellent fatigue performance, exceptional corrosion resistance and so on. Additive manufacturing (AM) is a complement to, rather than a replacement for, traditional manufacturing processes. It enhances flexibility in fabricating complex components and resolves machining challenges, resulting in reduced lead times for custom designs. However, owing to distinctions among various AM technologies, Ti alloys fabricated by different AM methods usually present differences in microstructure and defects, which can significantly influence the mechanical performance of built parts. Therefore, having an in-depth …

Network-Based Representations And Dynamic Discrete Choice Models For Multiple Discrete Choice Analysis, Huy Hung Tran, Tien Mai

Research Collection School Of Computing and Information Systems

In many choice modeling applications, consumer demand is frequently characterized as multiple discrete, which means that consumer choose multiple items simultaneously. The analysis and prediction of consumer behavior in multiple discrete choice situations pose several challenges. In this paper, to address this, we propose a random utility maximization (RUM) based model that considers each subset of choice alternatives as a composite alternative, where individuals choose a subset according to the RUM framework. While this approach offers a natural and intuitive modeling approach for multiple-choice analysis, the large number of subsets of choices in the formulation makes its estimation and application …

Poster: Towards Efficient Spatio-Temporal Video Grounding In Pervasive Mobile Devices, Dulanga Kaveesha Weerakoon Mudiyanselage, Vigneshwaran Subbaraju, Joo Hwee Lim, Archan Misra

Research Collection School Of Computing and Information Systems

As the use of pervasive devices expands into complex collaborative tasks such as cognitive assistants and interactive AR/VR companions, they are equipped with a myriad of sensors facilitating natural interactions, such as voice commands. Spatio-Temporal Video Grounding (STVG), the task of identifying the target object in the field-of-view referred to in a language instruction, is a key capability needed for such systems. However, current STVG models tend to be resource-intensive, relying on multiple cross-attentional transformers applied to each video frame. This results in runtime complexity that increases linearly with video length. Furthermore, deploying these models on mobile devices while maintaining …

Analyzing Swimming Performance Using Drone Captured Aerial Videos, Ngoc Doan Thu Tran, Kenny Tsu Wei Choo, Shaohui Foong, Hitesh Bhardwaj, Shane Kyi Hla Win, Wei Jun Ang, Kenneth T. Goh, Rajesh Krishna Balan

Research Collection School Of Computing and Information Systems

Monitoring swimmer performance is crucial for improving training and enhancing athletic techniques. Traditional methods for tracking swimmers, such as above-water and underwater cameras, face limitations due to the need for multiple cameras and obstructions from water splashes. This paper presents a novel approach for tracking swimmers using a moving UAV. The proposed system employs a UAV equipped with a high-resolution camera to capture aerial footage of the swimmers. The footage is then processed using computer vision algorithms to extract the swimmers' positions and movements. This approach offers several advantages, including single camera use and comprehensive coverage. The system's accuracy is …

Imitating Cost-Constrained Behaviors In Reinforcement Learning, Qian Shao, Pradeep Varakantham, Shih-Fen Cheng

Research Collection School Of Computing and Information Systems

Complex planning and scheduling problems have long been solved using various optimization or heuristic approaches. In recent years, imitation learning that aims to learn from expert demonstrations has been proposed as a viable alternative to solving these problems. Generally speaking, imitation learning is designed to learn either the reward (or preference) model or directly the behavioral policy by observing the behavior of an expert. Existing work in imitation learning and inverse reinforcement learning has focused on imitation primarily in unconstrained settings (e.g., no limit on fuel consumed by the vehicle). However, in many real-world domains, the behavior of an expert …

Pkt-Sin: A Secure Communication Protocol For Space Information Networks With Periodic K-Time Anonymous Authentication, Yang Yang, Wenyi Xue, Jianfei Sun, Guomin Yang, Yingjiu Li, Hwee Hwa Pang, Robert H. Deng

Research Collection School Of Computing and Information Systems

Space Information Network (SIN) enables universal Internet connectivity for any object, even in remote and extreme environments where deploying a cellular network is difficult. Access authentication is crucial for ensuring user access control in SIN and preventing unauthorized entities from gaining access to network services. However, due to the complex communication environment in SIN, including exposed links and higher signal delay, designing a secure and efficient authentication scheme presents a significant challenge. In this paper, we propose a secure communication protocol for SIN with periodic k-time anonymous authentication (named PkT-SIN) that allows satellite users to anonymously authenticate to ground stations …

Hydrogen From Food Waste: Energy Potential, Economic Feasibility, And Environmental Impact For Sustainable Valorization, Md Sanowar Hossain, Fairuz Wasima, Md Sharul I. K. Shawon, Barun K. Das, Pronob Das, Sanjay Paul

Research outputs 2022 to 2026

Globally, inefficient management of municipal solid waste, composed primarily of food waste poses concern for human and environmental well-being. Food waste can be converted into hydrogen gas, which can be utilized to generate power without emitting any harmful pollutants. This solution would also help with the issue of disposing of food waste. The conversion of food waste into hydrogen is a practical energy source with potential financial benefits. This study explores the transformative potential of converting food waste into renewable energy through hydrogen production, focusing on Bangladesh from 2023 to 2042. Notably, the study forecasts a surge in food waste …

Heat Sink With Fins And Phase Change Material For Cooling Of High-Power Electronic Devices, Farooq Fakher Mahmoud

Theses

Electronics are integral to modern life, present in everything from household appliances to advanced computers. The performance and reliability of these devices are closely tied to their operating temperatures. High-power operations can lead to significant heating, necessitating effective thermal management to enhance functionality and prevent failure. This requirement drives the demand for efficient heat sinks, which dissipate the heat generated by these devices. Phase change material (PCM)-based heat sinks have become a popular passive cooling solution, increasingly replacing traditional heat sinks.

This research investigates finned PCM-based heat sinks using numerical simulations validated by existing literature and experimental data. Gallium is …

The Impact Of Outdoor Thermal Comfort On Users’ Walkability: Study Case In Al Ain Square, Al Ain City, Uae, Alyazia Saeed Alnehayan

Theses

Living in a hot dry arid climate limits the walkability of its inhabitants. The excessive heat and dryness of the weather undoubtedly make walking a less tempting, encouraging, and pleasant choice for getting around the city. For that reason, this master thesis analyzes the various strategies used to enhance outdoor thermal comfort. Outdoor thermal comfort is controlled by numerous factors, including street and building orientation, vegetation, shading devices, and water bodies. The purpose of this study is to examine the relationship between walkability and UTCI values (universal thermal comfort index) in the context of Al Ain Square, a neighborhood in …

Performance Analysis Of Underground-To-Aboveground Communication In Agricultural Iot Networks, Irfana Ilyas Manzil

Theses

This thesis investigates the potential of LoRa, a low-power, wide-area networking technology, for establishing reliable communication between underground sensors and aboveground infrastructure. We comprehensively analyze LoRa's performance in both single-hop and multi-hop configurations, considering the impact of diverse environmental factors such as soil composition, moisture content, underground transmission distance, and path loss on signal propagation. We delve into the crucial role of the spreading factor (SF) within the LoRa communication system, analyzing its influence on network performance. Furthermore, we develop a comprehensive mathematical model for bit error rate (BER) under various channel conditions, including additive white Gaussian noise (AWGN) and …

Controlled Drug Delivery And Cellular Activities From Electrospun Fibers, Diala Bani Mustafa

Mechanical Engineering Theses

Electrospun drug-eluting fibers have demonstrated potential applications in topical drug delivery, where modulations of drug releases were achieved through polymer fiber compositions. In this study, blend fibers of polycaprolactone (PCL) and polyethylene oxide (PEO) at various compositions were electrospun from 10 wt% of polymer solutions to encapsulate a model drug of ibuprofen (IBP). Results showed that average polymer solution viscosities determined the electrospinning parameters and the resulting average fiber diameters. In vitro release of IBP suggested a transition from a gradual release to a fast release when increasing PEO contents in the PCL/PEO blend fibers up to 120 minutes. In …

Generative Data Augmentation: Using Dcgan To Expand Training Datasets For Chest X-Ray Pneumonia Detection, Ryan D. Maier

Master's Theses

Recent advancements in computer vision have demonstrated remarkable success in image classification tasks, particularly when provided with an ample supply of accurately labeled images for training. These techniques have also exhibited significant potential in revolutionizing computer-aided medical diagnosis by enabling the segmentation and classification of medical images, leveraging Convolutional Neural Networks (CNNs) and similar models. However, the integration of such technologies into clinical practice faces notable challenges. Chief among these is the obstacle of acquiring high-quality medical imaging data for training purposes. Patient privacy concerns often hinder researchers from accessing large datasets, while less common medical conditions pose additional hurdles …

Predicting Rheology Of Uv-Curable Nanoparticle Ink Components And Compositions For Inkjet Additive Manufacturing, Cameron D. Lutz

Master's Theses

Inkjet additive manufacturing is the next step toward ubiquitous manufacturing by enabling multi-material printing that can exhibit various mechanical, electronic, and thermal properties. These characteristics are realized in the careful formulation of the inks and their functional materials, but there are many constraints that need to be satisfied to allow optimal jetting performance and build quality when used in an inkjet 3-D printer. Previous research has addressed the desirable rheology characteristics to enable stable drop formation and how the metallic nanoparticles affect the viscosity of inks. The contending goals of increasing nanoparticle-loading to improve material deposition rates while trying to …

Impact Force Helmet Device For Concussion Monitoring, Patrice Mulligan, Karina Mealey, Zack Borthwick, Benjamin Fick

General Engineering

To track head trauma in football, our device is placed inside a football helmet to measure both linear and gyroscopic (rotational) accelerations. These measurements are taken using an ADXL375 linear accelerometer and an LSM6DSOX accelerometer and gyroscope. The data from these sensors is processed and transmitted wirelessly by a SparkFun Thing Plus microcontroller to another SparkFun Thing Plus microcontroller connected to a laptop on the sidelines. Our program on the laptop stores the acceleration impact data into a .csv file for each player. If a likely concussive impact is detected, the program displays a popup warning. Testing results were promising …

Smart Manufacturing For Cal Poly's Ime Curriculum, Grace L. Guarraia, Eric F. Ledesma

Industrial and Manufacturing Engineering

California Polytechnic State University, San Luis Obispo (Cal Poly) takes pride of supporting one of the nation’s strongest undergraduate Industrial and Manufacturing Engineering programs. However, as industry evolves to accommodate advancing computing power, improved manufacturing algorithms, and improved robotics, it is imperative that Cal Poly’s curriculum evolves in parallel. Smart manufacturing is the future of the manufacturing industry, and Cal Poly is searching for the ideal method to teach and integrate Smart Manufacturing into its classes. With its upcoming switch to the semester system, coupled with its “Learn by Doing” motto, the department is at an ideal period for the …

Two-Story Dod Office Building, Jacob Ost

Fire Protection Engineering: Culminating Experience Project Reports

This report is a comprehensive analysis of the fire protection and life safety components for an administrative office building designed for the Department of Defense. The owner of the facility has requested that all identifying information, including name and location, not be included in this report and has since been removed from the documents.

The building was designed in 2019 and is currently under construction. The building is two stories with a total area of approximately 125,000 square feet. The building is primarily used as office space for administrative personnel and consists of open and single-user office space, conference rooms, …

Student Center Building, Mark Slonina

Fire Protection Engineering: Culminating Experience Project Reports

The new Student Center (SC) is planned as a 140,000 GSF four (4) story building with a basement. The program for the building includes classrooms, an auditorium, fabrication & assembly, glass blowing, student organizations that build & test vehicles, meeting rooms, demonstration kitchen, café, retail, and a lounge. An exterior courtyard is planned on Level 2 which allows for outdoor assembly spaces.

This report identifies major code requirements for means of egress, structural fire protection, fire suppression, and fire alarm systems. The report also identifies the major fuel loads in the building. A performance-based assessment is provided for roof construction …

Rover On A Chip (Roach) Debris Utility & Solar Shell Technology (Dusst), Joshua Aaron Tuttobene, Jacquelyn Rose Banh, Nathan Christopher Chapman, Tanner Casey Wells

Mechanical Engineering

The Rover on A Chip project’s Debris Utility and Solar Shell Technology team’s final design is outlined in this document. Starting with the design of our system, this document highlights important progress made since the Critical Design Review and fully describes our final design and verification of our final prototype. We then justify these design choices by testing multiple functionalities and conditions to ensure they will meet all of our specifications. Next, we describe in detail our procurement manufacturing method for the project. Lastly, we wrap up by discussing recommendations and the next steps for the project moving forward.

Since …

3d-Printed Remote Controlled Aircraft, Sebastian Bessoudo, Jose Ramirez, Manny Ruiz, Andrew Edwards

Mechanical Engineering

The Senior Project for the 3D Printed Aircraft presents a compelling challenge to the team: design and fabricate an aircraft for the Cal State LA 3D-Printed Fixed-Wing Aircraft Competition, comprising three distinct events: Flight, Design, and Simulation. The objective of the flight competition is to achieve the longest flight duration, while the design event emphasizes innovation and originality. In the Simulation contest, our aircraft's CAD model undergoes Computational Fluid Dynamics analysis to assess its aerodynamic performance. These competitions are slated for May 2024.

While building the aircraft has its limitations due to the source of our construction being only 3D …

Snap It & Send It, Samantha Gonzales, Brienne Berger, Kelsea Clays, Jessica Schmok

Mechanical Engineering

This report details the final design, manufacturing and assembly, testing procedures and results, as well as future design recommendations of a device aimed at enhancing the mountain biking experience for individuals with limited thumb strength. This project particularly focused on the experience of our sponsor, Cal Poly Mechanical Engineering Professor Andrew Kean. Our team's objective was to create a secure, ergonomic handlebar grip system that does not require thumb strength and is adaptable to various mountain bike models. The final design utilizes a rigid hook that snaps onto mountain bike handlebars with a long, flat piece that slides into a …

Automated Expanding Fireplace, Fermin Moreno, Eduardo Hernandez, Wilbert Quiterio, Ben Hoefer

Mechanical Engineering

The Final Design Review (FDR) encompasses information regarding the final design verification prototype (FVP), manufacturing, testing, and future recommendations for the Expanding Fireplace Senior Project sponsored by the SLO Civic Ballet. The project aims to create the frame of an expanding fireplace set piece for The Nutcracker production at the Cal Poly Performing Arts Center in December 2024. The current set piece being used has unfavorable features that will be addressed with the new design. The current set piece being used has unfavorable features that have been addressed with the new design we have developed. Our sponsors have proposed several …

Miniature Train Engine, Jason Patrick Lacson Del Castillo, Renato Andrew Dilauro, Sophia Theresa Tiu, Robert John Pallares Iii

Mechanical Engineering

This report details the redesign of the Mini Train Prop for the SLO Civic Ballet’s The Nutcracker, aiming to create a lighter, more user-friendly, and easily maneuverable train. The Final Design Review (FDR) includes the design process, manufacturing plan, and justifications for decisions made. Key improvements are reducing the train's weight, automating the fake wheels, and enhancing maneuverability with a neutral pin and lever system. In this report we detail the significant changes since the Critical Design Review (CDR). The implementation covers procurement, manufacturing, and assembly, while design verification ensures compliance with cost, weight, turn radius, and structural integrity specifications. …

Bird Trail Stairway Access Replacement, Mackenzie Wright, William Spellman, Nicholas Buccino, Jack Long

Mechanical Engineering

Dana Adobe & Cultural Center, a non-profit organization in Nipomo, California, seeks to restore access to the Bird Trail located on their site. This project aims to design and manufacture a replacement stairway for safe creek bed crossing on the trail. Within this document, we have detailed our system design, function, and justification for our design. The procurement, manufacturing, and assembly plan have been outlined along with tests we completed.

One of the most important functions of our design is for the structure to be retractable so that it can be removed from the creek bed when needed. To address …

Facility Thermal Balance And Transport, Giovanni V. Minnite, Silas O R Goldfarb, Cole J. Houston, Dominique Aguilera, Cole M. Silva

Mechanical Engineering

This Final Design Review (FDR) report outlines the senior design project completed by a team of five mechanical engineering students at California Polytechnic State University, San Luis Obispo for Senior Industrial Engineer, Mr. Tom Bass, of Entegris, Inc. The team developed an innovative system to address the issue of ice accumulation on cryogenic vaporizers at the Entegris facility. Ice buildup, caused by the extremely low temperatures of the cryogenic fluid, reduces the efficiency of vaporizers and places additional stress on the system. To combat this, the team designed and constructed a prototype that utilizes a thermal transport loop to transfer …

F21 - Variable Damper, Harrison Pomerantz, Anthony Mendoza, Owen Wilks

Mechanical Engineering

This document outlines the final design phase for the Solar Turbines Variable Damper project, aiming to enhance the safety and serviceability of gas turbines enclosure ventilation system. The primary focus of this project is to address the challenge of maintaining optimal internal pressure within the gas generator enclosures while enabling remote control of the damper position.

In this report, the full system design is described in detail. Then, the part procurement, manufacturing, and assembly of the variable damper and test stand is provided to outline the steps and processes taken to complete the final prototype. After discussing the final prototype, …

Design And Characterization Of A Broadband Rf Switch Utilizing Surface Mount Devices, Daniel Bracamontes

Master's Theses

High frequency solid-state switches are critical elements in communication systems, radio frequency (RF) systems and instrumentation. Key parameters to an RF switch include insertion loss while on and off-state isolation. Power handling and linearity are important to consider for a cost-effective construction. This becomes a design challenge into K-band frequencies as components required need to be small, dielectric losses and transmission lines need to be physically matched for proper isolative and through states. This thesis presents a novel single pole eight throw (SP8T) hybrid design composed of commercially available surface mount technology solutions to achieve high isolation and low insertion …

Exploring Cybertechnology Standards Through Bibliometrics: Case Of National Institute Of Standards And Technology, Tugrul Daim, Haydar Yalcin, Alain Mermoud, Valentin Mulder

Engineering and Technology Management Faculty Publications and Presentations

Cyber security is one of the topics that gain importance today. It is necessary to determine the basic components, basic dynamics, and main actors of the Cyber security issue, which is obvious that it will have an impact in many areas from social, social, economic, environmental, and political aspects, as a hot research topic. When the subject literature is examined, it has become a trend-forming research subject followed by institutions and organizations that produce R&D policy, starting from the level of governments. In this study, cybersecurity research is examined in the context of 5 basic cyber security functions specified in …

Underwater Acoustic Telemetry For Marine Permaculture, Jonathan Lin, Harrison Shaw, Ben Shiverdaker, Mark Ellersick

Electrical and Computer Engineering Senior Theses

As a result of global warming and rising ocean temperatures and sea levels, seaweed forests are degrading. Seaweed biomass loss presents significant risks to coastal communities that rely on seaweed forests for food, livestock feed, fertilizer, and more. Marine Permaculture is the Climate Foundation’s regenerative farming initiative to grow seaweed outside of its intended habitat. The “Deep Cycling” technique involves positioning a submersible bed near the water surface during the day and lowering it at night, allowing for seaweed to receive sunlight and cold water. Prior work on this project included establishing a temperature control loop, though did not include …

Storage Solutions Within Memory Capacitor Technologies, Sam Anderson

Electrical and Computer Engineering Senior Theses

The need for efficient memory solutions is ever-increasing in the contemporary computing technology landscape, particularly in neuromorphic computing. This thesis introduces a novel approach to memory storage using memcapacitors, which store information via capacitance rather than voltage, offering a promising alternative to traditional memory systems. Through the development and simulation of memcapacitor technologies, this work explores their potential to enhance machine learning capabilities and reduce power consumption. Our research demonstrates that memcapacitors can be effectively implemented at the nano-scale, albeit with substantial manufacturing investment. We employed various optimization strategies, including circuit adjustments and behavioral modeling simulations, to maximize the efficiency …

In Situ And 2d And 3d In Silico Redox Cycling Studies For Design Optimization Of Coplanar Arrays Of Microband Electrodes In A 70 Μm × 100 Μm Electroactive Footprint, Miguel Angel Abrego Tello, Mahsa Lotfi Marchoubeh, Ingrid Fritsch

Chemistry & Biochemistry Faculty Publications and Presentations

Optimization of redox-cycling currents was performed by adjusting the height (sidewalls, h), width (w), and length (l) of band electrodes and their spacing (w_gap) in coplanar arrays restricted to a small-electroactive window of 70 × 100 μm. These arrays can function in μL-volumes for chemical analysis (e.g., in-vivo dopamine detection using probes). Experiments were conducted with an array of five electrodes (NE = 5), w = 4.3 μm, w_gap = 3.7 μm, h = 0.150 μm, and l = 99.2 μm. Reasons for …