Digital Commons Network^™

Automating Self Evaluations For Software Engineers, Jonathan Rodrigo A. Miranda

Master's Theses

Software engineers frequently compose self-evaluations as part of employee perfor- mance reviews. These evaluations can be a key artifact for assessing a software engineer’s contributions to a team and organization, and for generating useful feed- back. Self-evaluations can be challenging because a) they can be time consuming, b) individuals may forget about important contributions especially when the review period is long such as a full year, c) some individuals can consciously or unconsciously overstate their contributions, and d) some individuals can be reluctant to describe their contributions for fear of appearing too proud [24].

UNBIASED, Useful New Basic Interactive Automated …

Trust, Reciprocity, Fairness, And Mind Reading Under Stress, Charles Jia Yao Xie

Master's Theses

Some hypothesized that when stressed, females activate tend-and-befriend, a stress response that enhances social abilities. Yet, critics argued this stress response is not exclusive to females and others suggested that males and females have different stress responses associated with social skills. This study intended to address these criticisms by testing whether males exhibit prosocial responses to stress and if particular stress responses improved social skills. To do this, 70 healthy introductory psychology students from a large public university in northern California were recruited to participate. Using random assignment, half of these individuals were exposed to an acute stressor and another …

Analysis Of Electromagnetic Launcher Design And Modeling, Garrett Ross Germany

Master's Theses

This thesis derives working expressions from electromagnetic physical laws to gain a deeper understanding of the nature of railguns. The expressions are refined for ease of use and then compared to electromagnetic simulators that solve complex equations that arise from different rail geometry. Further simplifications lead to an expression for the final velocity of the projectile and showcase the importance of the system resistance to projectile flux gain ratio. A Simulink simulation then incorporates the resulting non-linear differential equations and approximates the projectile velocity over time based on physical dimensions and material properties. Some equations derived can be found in …

Zebra Crosswalk Detection Assisted By Neural Networks, Jason David Banich

Master's Theses

It can be difficult to guide yourself across a crosswalk when your visual capabilities are limited, which can be an everyday issue for someone with impaired vision. This paper aims to alleviate that issue for zebra stripe crosswalks by proposing an algorithm that incorporates multiple properties of zebra stripe crosswalks with a neural network to assist in quickly and accurately identifying a crosswalk in video and pictures taken from a smartphone camera.

This method improves the accuracy of zebra crosswalk detection in images. In a large dataset, it correctly identified 76.5% of zebra crosswalks, while reducing the false discovery rate …

After The Paris Agreement: How India Can Use Climate Financing To Implement A Sustainable Clean Cookstove Program, Hannah Kornfeld

Master's Theses

The burning of biomass for cooking purposes without proper ventilation and filters poses a massive health and climate risk. Health implications from exposure to household air pollution from this type of fuel impacts women and children in many developing countries, who spend many hours a day cooking and gathering fuel. Climate implications from burning solid biomass results in increased carbon dioxide and black carbon emissions, which contribute to global climate change. This thesis aims to explore the issues associated with biomass cookstoves in terms of both health and climate, and seeks to understand how a new national clean cookstove program …

Sysml Based Cubesat Model Design And Integration With The Horizon Simulation Framework, Shaun Luther

Master's Theses

This thesis examines the feasibility of substituting the system input script of Cal Poly’s Horizon Simulation Framework (HSF) with a Model Based Systems Engineering (MBSE) model designed with the Systems Modeling Language (SysML). A concurrent student project, SysML Output Interface Creation for the Horizon Simulation Framework, focused on design of the HSF Translator Plugin which converts SysML models to an HSF specific XML format. A SysML model of the HSF test case, Aeolus, was designed. The original Aeolus HSF input script and the translated SysML input script retained the format and dependency structure required by HSF. Both input scripts …

Exploring Data Driven Models Of Transit Travel Time And Delay, Bobjot Singh Sidhu

Master's Theses

Transit travel time and operating speed influence service attractiveness, operating cost, system efficiency and sustainability. The Tri-County Metropolitan Transportation District of Oregon (TriMet) provides public transportation service in the tri-county Portland metropolitan area. TriMet was one of the first transit agencies to implement a Bus Dispatch System (BDS) as a part of its overall service control and management system. TriMet has had the foresight to fully archive the BDS automatic vehicle location and automatic passenger count data for all bus trips at the stop level since 1997. More recently, the BDS system was upgraded to provide stop-level data plus 5-second …

A Comparison Of Risk Assessment Models For Pipe Replacement And Rehabilitation In A Water Distribution System, Lyle John Nemeth

Master's Theses

A water distribution system is composed of thousands of pipes of varying materials, sizes, and ages. These pipes experience physical, environmental, and operational factors that cause deterioration and ultimately lead to their failure. Pipe deterioration results in increased break rates, decreased hydraulic capacity, and adverse effects on water quality. Pipe failures result in economic losses to the governing municipality due to loss of service, cost of pipe repair/replacement, damage incurred due to flooding, and disruptions to normal business operations. Inspecting the entire water distribution system for deterioration is difficult and economically unfeasible; therefore, it benefits municipalities to utilize a risk …

A Solution To The Circular Restricted N Body Problem In Planetary Systems, Jay R. Iuliano

Master's Theses

This thesis is a brief look at a new solution to a problem that has been approached in many different ways in the past - the N body problem. By focusing on planetary systems, satellite dynamics can be modeled in a fashion similar to the Circular Restricted Three Body Problem (CR3BP) with the Circular Restricted N Body Problem (CRNBP). It was found that this new formulation of the dynamics can then utilize the tools created from all the research into the CR3BP to reassess the possibility of different complex trajectories in systems where there are more than just two large …

Skewer: Sentiment Knowledge Extraction With Entity Recognition, Christopher James Wu

Master's Theses

The California state legislature introduces approximately 5,000 new bills each legislative session. While the legislative hearings are recorded on video, the recordings are not easily accessible to the public. The lack of official transcripts or summaries also increases the effort required to gain meaningful insight from those recordings. Therefore, the news media and the general population are largely oblivious to what transpires during legislative sessions.

Digital Democracy, a project started by the Cal Poly Institute for Advanced Technology and Public Policy, is an online platform created to bring transparency to the California legislature. It features a searchable database of state …

C-Salt: Conversational Style Attribution Given Legislative Transcriptions, Garrett D. Summers

Master's Theses

Common authorship attribution is well described by various authors summed up in Jacques Savoy’s work. Namely, authorship attribution is the process “whereby the author of a given text must be determined based on text samples written by known authors [48].” The field of authorship attribution has been explored in various contexts. Most of these works have been done on the authors written text. This work seeks to approach a similar field to authorship attribution. We seek to attribute not a given author to a work based on style, but a style itself that is used by a group of people. …

Wildfire Detection System Based On Principal Component Analysis And Image Processing Of Remote-Sensed Video, Ryan F. Radjabi

Master's Theses

Early detection and mitigation of wildfires can reduce devastating property damage, firefighting costs, pollution, and loss of life. This thesis proposes the method of Principal Component Analysis (PCA) of images in the temporal domain to identify a smoke plume in wildfires. Temporal PCA is an effective motion detector, and spatial filtering of the output Principal Component images can segment the smoke plume region. The effective use of other image processing techniques to identify smoke plumes and heat plumes are compared. The best attributes of smoke plume detectors and heat plume detectors are evaluated for combination in an improved wildfire detection …

Low-Frequency Series Loaded Resonant Inverter Characterization, Alfredo Medina

Master's Theses

Modern power systems require multiple conversions between DC and AC to deliver power from renewable energy sources. Recent growth in DC loads result in increased system costs and reduced efficiency, due to redundant conversions. Advances in DC microgrid systems demonstrate superior performance by reducing conversion stages. The literature reveals practical DC microgrid systems composed of wind and solar power to replace existing fossil fuel technologies for residential consumers. Although higher efficiencies are achieved, some household appliances require AC power; thus, the need for highly efficient DC to AC converters is imperative in establishing DC microgrid systems. Resonant inverter topologies exhibit …

Hall Effect Modeling In Fem Simulators And Comparison To Experimental Results In Silicon And Printed Sensors, Leonardo A. Frem

Master's Theses

Finite element method simulation models for thin-film semiconductor-based Hall sensors were developed using secondary data in order to understand their behavior under strong magnetic fields. Given a device geometry and charge carrier density and mobility, the models accurately calculated sensor resistance, Hall voltage under a normally-incident constant magnetic field, and expected offset from a population of Hall devices. The model was successfully matched against data from integrated chip Hall sensors from St. Jude Medical. Additionally, the feasibility of creating Hall effect devices with common carbon ink was explored experimentally. The material properties obtained from testing these ink-based devices through the …

Categorizing Blog Spam, Brandon Bevans

Master's Theses

The internet has matured into the focal point of our era. Its ecosystem is vast, complex, and in many regards unaccounted for. One of the most prevalent aspects of the internet is spam. Similar to the rest of the internet, spam has evolved from simply meaning ‘unwanted emails’ to a blanket term that encompasses any unsolicited or illegitimate content that appears in the wide range of media that exists on the internet.

Many forms of spam permeate the internet, and spam architects continue to develop tools and methods to avoid detection. On the other side, cyber security engineers continue to …

Characterizing Neurotransmitter Receptor Activation With A Perturbation Based Decomposition Method, Stephen Gregory Jue

Master's Theses

The characterization of postsynaptic potentials, in terms of neurotransmitter receptor activation, is of clinical significance because information associated with receptor activation can be used in the diagnosis and study of neurological disorders. Single-unit recordings provide a method of measuring postsynaptic potentials in neurons using a microelectrode system, but yield no detailed information regarding the neurotransmitter receptors that contribute to the potential. To determine the types of neurotransmitter receptors that result in a compound postsynaptic potential from a microelectrode reading, decomposition of the potential is necessary. In this work, a perturbation-based decomposition method developed by R. Szlavik is evaluated for this …

Development And Characterization Of Reagent Pencils For Microfluidic Paper Based Analytical Devices, Cheyenne H. Liu

Master's Theses

Microfluidic paper based analytical devices (microPADs) are a novel platform for point of care (POC) diagnostics. Limitations of reagent shelf life have been overcome with the introduction of reagent pencils as a method for solid-based reagent deposition. While useful, little work has been reported on the characterization and optimization of reagent pencils. Herein, an investigation on reagent pencil composition and efficiency is conducted via colorimetric release profile tests utilizing an erioglaucine disodium salt that yields a quantifiable blue colored product in the presence of water. Within this work, an investigation on the molecular weight dependence, polymer chain end functionality, and …

Processing Of Simulated And Experimental Images Of Closely Spaced Binary Stars Using Speckle Interferometry, Niels Smidth

Master's Theses

Theory and methods of processing speckle interferometry data from close visual binary stars are presented and implemented. The effects of the optical systems used for observing close visual binary stars are explained and simulated from both the geometrical and physical optical viewpoints. The atmospheric phase distortion and shot noise responsible for the observed speckle patterns are simulated. The deconvolution technique originally presented by Labeyrie is implemented to extract astrometric data from close visual binary stars. This method is applied to both simulated and experimental data from Kitt Peak National Observatory as validation. Parts of the deconvolution process are optimized to …

Lower Scotts Creek Floodplain And Habitat Enhancement Project, Benjmain O. Cook

Master's Theses

Scotts Creek, located in northern Santa Cruz County, maintains the southernmost persistent population of Central California Coast (CCC) Coho Salmon (endangered) in addition to CCC steelhead (threatened). Fisheries biologists believe overwinter mortality due to lack of refuge habitat is the primary factor limiting salmonid production. Instream rearing habitat may also be limiting, especially during drought years. The legacy effects of historic land use practices, including dredging, wood removal, and the construction of levees, continued to limit refuge and rearing opportunities. A restoration project was implemented to improve refuge and rearing opportunities for salmonids along lower Scotts Creek by removing portions …

Nanosatellite Probes In Interplanetary Space: An Augmented Cassini Mission, Trent T. Voris

Master's Theses

The exploration of interplanetary space is one of the most challenging and costly ventures in human history. The relatively low amount of information on other sites beyond Earth is largely due to the rarity of effective trajectories as well as the high levels of risk and complexity inherent in innovative space exploration. One solution to this lack of information is the use of deployable satellite probes to help augment the main mission and its instrumentation. This “Mother- Daughter” architecture allows for the low-cost exploration of hazardous sites and numerous points of interest without compromising the primary mission.

While the end …

The Effects Of Online Course Pedagogies On Learning And Cognitive Workload, Kallan Kay Christensen

Master's Theses

The use of recorded lecture video is a common online practice, although the implementation of this pedagogy varies and may have differential impacts on learning depending on the extent to which it increases cognitive workload. This study compared two different online statistics lecture formats: interactive and non-interactive. The interactive lecture video stopped approximately every minute and the participant had to answer a question regarding the material before moving on to the next section of the video. The non-interactive lecture video was the exact same video edited to remove all interactive breaks in the video. Cognitive workload was measured using the …

Dendrimer Modified Silica Nanoparticles As Fluorescent Chemosensors For The Detection Of Copper And Cyanide Ions, Alicia Luhrs

Master's Theses

A series of silica nanoparticle-based fluorescent chemosensors were synthesized for the sensitive and selective detection of Cu²⁺ ions in aqueous solution and subsequent CN^- ion detection. Silica nanoparticles (SNP) were modified with branching polyamidoamine (PAMAM) dendrimers, which function as selective turn-off Cu²⁺ ion chelators and platforms for the attachment of rhodamine isothiocyanate (RITC) or fluorescein isothiocyanate (FITC) fluorescent dyes. In the presence of Cu²⁺ ions, the emission of the fluorescent dye is quenched by Forster resonance energy transfer (FRET) and is dependent upon dendrimer generation, pH, fluorescent dye, and surface charge. The quenching effectiveness was analyzed …

Effect Of Non-Monetary Incentives On Women's Competitive Inclination: Experimental Evidence From Ancona, Italy, Kalkidan Shebi

Master's Theses

This study investigates how monetary incentives versus non-monetary incentives affect women’s decision to enter a competitive environment. This study was conducted in Ancona Italy, in a controlled laboratory experiment with a total of 60 participants; of which 29 were male and 31 were female. Participants were given mathematical addition problems to solve under alternative incentives. How they received these incentives differed based on their preference to enter or withdraw from the competition. The study also included components that assessed risk preferences and willingness to pay for the non-monetary incentive in the experiment. Results show no significant difference in performance scores …

Reducing The Stem Gender Achievement Gap: Investigating Factors Influencing Female Students’ Major Choices, Shiyu Song

Master's Theses

Taking the first step to unveil female’s underrepresentation in STEM, this study adopts a mixed method design to explores possible factors that influence female college students’ choices to stay in or leave STEM. Undergraduates at University of Connecticut (N=386) completed an online questionnaire and female students who had either left (N=5) or were staying in STEM fields (N=7) were further selected to participate in the interview.

Results from the quantitative analysis showed that female students’ level of stigma consciousness is a significant predictor of their choice to stay in or leave STEM. Specifically, females who are more vulnerable to gender …

Prediction Of Internal Body Temperature Using Machine Learning Models, Luke N. Belval

Master's Theses

Context: The only validated methods for assessment of deep body temperature during exercise in the heat are invasive or logistically difficult to implement. Non-invasive prediction of deep body temperature has the potential to provide critical information to individuals who exercise in environmental extremes. Objective: To examine the use of machine learning methods for the prediction of deep body temperature using non-invasive measures. Setting: Research laboratory. Participants: Twenty-five recreationally active participants (mean±SD; male, n=19; female, n=6, age, 24±4 y; height, 177±10 cm; body mass, 75.94±12.45 kg; body fat, 15.31±6.55%). Interventions: We pooled data from two studies wherein participants walked and ran …

Emergency Shelter Resource Allocation And Location Analysis, Brett T. Decker

Master's Theses

This study formulates a mixed-integer facility location model to optimize emergency shelter location and resource allocation based on a set of existing candidate shelters. This model minimizes network access time between an affected census block and a potential emergency shelter, the operating costs of a shelter as a function of shelter capacity, and the cost of not accommodating all evacuees with emergency shelter capacity at the planning stage. This study consists of two parts, one conducting a sensitivity analysis for model parameters and executing the model for a worst case scenario and the second part expanding the model to include …

Modeling And Computationally Efficient Algorithms For Analysis Of Battery Equalization Systems, Chen Zhou

Master's Theses

No abstract provided.

Behavioral Modeling Of Motor Drive Systems Efficiency, Artur Ulatowski

Master's Theses

While power losses and efficiency of single components of electric motor drive systems were researched extensively, the overall system efficiency has been rarely approached. The wide-spread applications of electric machines make them the largest electrical energy consumers, thus the efficiency of motor drive systems is of fundamental effect on global energy consumption. Analytical efficiency modeling of motor drive systems is a very difficult task due to complex interactions in a motor drive system (electrical, mechanical, magnetic, thermal, etc.). In this thesis, a novel method of applying black-box approaches for motor drive efficiency modeling is presented. The proposed methodology is flexible …

Strain And Dislocations In Nitride-Based Heterostructures, Johanna Raphael

Master's Theses

This work provides a computational tool for predicting strain and dislocation density in nitride-based heterostructures at equilibrium. The framework and computational tool reviewed in this thesis has yielded critical layer thickness (CLT) results for nitride-based heterostructures such as InxGa1-xN/GaN (0001), InxGa1-xN/GaN (11-22) and AlxGa1-xN/GaN (0001). The presented CLT results are compared with calculations via established CLT models and empirical data. Dislocation density and strain profiles calculated for InxGa1-xN/GaN (0001) and InxGa1-xN/GaN (11-22) in linearly graded configurations are provided. These results demonstrate that with modification J. Tersoff’s zinc-blende based analysis of dislocation confinement to compositionally graded layers in multi-layer heterostructures is …

Applications Of Advanced Signal Processing Techniques In Pure And Applied Geophysics, Robert W. Mehl

Master's Theses

No abstract provided.