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- Creator:
- Silvas, Rebecca
- Description:
- There is limited literature on how factors like race and disguise jointly impact eyewitness identification. Both of these factors are very likely to occur simultaneously in a crime in which an eyewitness may need to identify the perpetrator. Researchers agree on the well-established existence of the other-race effect (ORE) Malpass & Kravitz, 1969; Meissner, Susa, & Ross, 2009, and the negative effects of disguises on facial recognition (Righi, Peissig, & Tarr, 2012; Fletcher, Butavicius, & Lee, 2008). the present study sought to explore the relationship between these factors. This study examined facial recognition amongst Asian, White, and Latinx participants using faces from all three races either wearing a disguise (hoodie and sunglasses) or no disguise. to investigate how quality and quantity of interactions with other races impacted facial recognition and the ORE, participants also completed an Interracial Contact Questionnaire. There was a significant main effect for disguise across all participants. Overall, all three races performed poorer on disguise trials than non-disguise regardless of the race of face. the relationship between accuracy and experience with other races was found to be nonsignificant. in the present study, we did not find evidence of the ORE, which may be the result of these disguises decreasing accuracy to below chance levels. It is also possible that an ORE might be found using more sensitive measures of performance. Future studies should consider the limitations of this study to further explore the effect of hoodies on face recognition.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
- Creator:
- Grewal, Harkishan Singh
- Description:
- Autonomous navigation has risen to prominence in public discourse in recent years. Pursuits of a self-driving car by notable tech companies, Tesla and Waymo (formerly Google self-driving car project), have brought autonomous navigation to the forefront and inspired much excitement. However, the applications of autonomous navigation are not limited to self-driving cars. A potential and promising application is to modify electric wheelchairs to improve the lives of individuals with disabilities. Individuals with motor neurodegenerative diseases and spinal cord injuries cannot use conventional wheelchairs, leaving them immobile and stripped of autonomy. An autonomous wheelchair capable of navigation in both mapped and unmapped indoor environments is proposed to restore mobility and autonomy to such individuals. The wheelchair uses various sensor to detect stationary and moving obstacles in real-time, enabling it to safely chart a course to its destination. Several sets of trials are conducted to test the functionally of the proposed system in different mapped and unmapped environments. The proposed system successfully and autonomously navigated to its destination in most trails with no collisions. These results are promising and validate the design, usability, and safety of the proposed system. They show potential of enriching the lives of individuals with disabilities with autonomy and mobility.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Computer Science
- Creator:
- Pelayo, Pablo, Jr.
- Description:
- Assistive technologies performing bio-medical applications may be extremely beneficial for individuals who suffer from neurodegenerative diseases such as Amyotrophic Lateral Sclerosis or Locked-In Syndrome. These diseases usually progress and continue to limit patients. Therefore, a universal system which still works as their disease progresses would be extremely beneficial to the patients because of the familiarity and cost-effectiveness. the system presented supports six types of input, and neck movements is seen as the starting point of the system because of its high accuracy and fast response time. Two other common input sources are Electromyography, which uses signals corresponding to muscle movements, and Electrooculography, where patients can move their eyes in order to serve as the system control. Unfortunately, if the disease keeps on progressing then a patient may lose voluntarily neck, muscle, and eye movements. Luckily, the presented system still supports input signals even if voluntary movements are gone. Brain-Computer Interface processes Electroencephalography signals, using three paradigms: Steady-State Visual Evoked Potential, P300-based Event Related Potential, and Auditory Steady-State Response. Multiple trials were conducted to test the accuracy and efficiency of the system. the average accuracy for the presented system is 80.55%. the application presented in this study is intended for iOS communication, but the end product can be integrated with any other system, including an electric wheelchair and robotic arm.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Computer Science
- Creator:
- Machia, Tiffany
- Description:
- Since the advent of the Internet, researchers have sought to determine whether the Internet may advance users’ well-being or if Internet use is associated with a variety of negative outcomes, including emotional distress. Additionally, although social support literature tends to indicate that social support is associated with increased emotional well-being, the research on the impact of social support on the relationship between Internet use and depression has yielded inconclusive results. Existing literature also neglects the role that offline social support and the different types of social support (emotional, companionship, informational, and tangible) have on this relationship. the current study sought to explore the relationships between Internet use, types of offline social support, and depression. a sample of 164 undergraduate students at California State University, Fullerton completed a series of measures of their Internet use patterns, perceived offline social support, and depression. Results of a linear regression indicated that Internet use did not significantly predict levels of depression. Hierarchical multiple regression analyses indicated that all types of social support (emotional, companionship, informational, and tangible) did not moderate an Internet use-depression relationship. However, all types of offline social support were found to be significant predictors of depression. Specifically, increases in the various types of social support were positively associated with depression. Findings of this study are in direct opposition with prior research. Possible explanations for this discrepancy are discussed.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Psychology
- Creator:
- Ly, Phillip
- Description:
- The goal of this thesis is to create mobile applications that can leverage the power of deep learning to detect malignant melanoma in the early phase and save lives. Thus, it is imperative to extend the reach of such essential diagnostic care worldwide. in this thesis, we will first present three deep learning methodologies that entail constructions of convolutional neural networks in conjunction with the uses of modern transfer learning and regularization techniques. the proposed deep learning methodologies leverage a dynamic dataset to optimize performance of a skin cancer classification mobile application called ChekSkin. Dynamic datasets refer to the expansion of datasets from influx of new data. Furthermore, the proposed deep learning methodologies generate mobile compatible models by rendering and training 80,192 high quality images. We performed rigorous experiments to attain the following top-1 accuracies: 81% (overall accuracy on the test dataset) using advanced transfer learning and data augmentation techniques via TensorFlow, 85.7% by training a batch-normalized CNN from scratch, and 88.35% with the uses of potent feature extraction and data augmentation methods via Keras. Additionally, the ChekSkin app is tested in real-world situations in which there are drastic variations in lighting conditions and image quality. We have considered tests in both experimental and real-world settings as important metrics for life-saving mobile applications.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Computer Science
- Creator:
- Al-behadili, Mohammed
- Description:
- Undrained shear strength is important in the evaluation of the stability of both natural and man-made slopes. Some researchers have proposed methods such as SHANSEP to evaluate the undrained shear strength of fine grained soils. However, the impact of plasticity characteristics and mineralogical composition on the undrained shear strength has not been widely studied. to do so, the SHANSEP technique was extended to include the interpretation of the normalized undrained strength ratio in this study. to determine the normalized undrained strength ratio, the undrained strength ratio for a sample at any over-consolidation ratio (OCR) is normalized by the value of undrained strength ratio for a normally consolidated sample of the same soil. This study will also focus on calculating the true friction angle and the true cohesion of various mixtures. in this study, five mixtures of montmorillonite with quartz and three mixtures of kaolinite with quartz were used. Unique relationships dependent on the mineralogical composition were developed between the normalized undrained strength ratio with the OCR. the results also showed that the true friction angle decreases with an increase in plasticity index for soils with plasticity indices less than 60% and liquid limit in soils with liquid limits less than 125%, beyond which there are negligible changes in the true friction angle. the base friction angle increases with an increase in plasticity index and liquid limit in soils with kaolinite as the clay mineral, but does not change significantly in soils with montmorillonite as the clay mineral.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Civil and Environmental Engineering
- Creator:
- Menon, Vivek Anand
- Description:
- This research involves the use of Molecular Dynamics (MD) simulation technique to investigate the complex and dynamic mechanisms involved in Liquid-Assisted Laser Beam Micromachining (LA-LBMM) process both in static and dynamic mode. the results of the MD simulation are compared with those of Laser Beam Micromachining (LBMM) performed in air. the study revealed that machining during LA-LBMM process showed higher removal compared with LBMM process. the LA-LBMM process in dynamic mode showed lesser material removal compared with static mode as the flowing water carrying the heat away from the machining zone. Investigation of material removal mechanism revealed the presence of a thermal blanket and bubble formation in LA-LBMM process aiding in higher material removal. the findings of this study provide further insights to strengthen the knowledge base of laser beam micromachining technology.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Mechanical Engineering
- Creator:
- Duccini, Kalie
- Description:
- Rare olivine-pyroxene cumulates and hornblende gabbros of the ca. 150 Ma Summit gabbro are scrutinized with the goal of revealing initial differentiation trajectories and source characteristics of mafic magmas within the Late Jurassic Sierra Nevada arc. Geochemical analyses suggest that the magmas that produced the Summit gabbros were not primary, mantle-derived magmas, but rather experienced differentiation in the mid- to lower crust prior to their emplacement in the upper crust. Xenocrystic zircon grains in one cumulate sample document some amount of mid-crustal assimilation. in other samples, multi-shell coronas separate adjacent olivine and plagioclase crystals. Coronas likely formed by solid-state recrystallization during slow subsolidus cooling at relatively high (> 6 kbar) pressures, consistent with initial crystallization in the deep crust. Evidence for dissolution and reequilibration in early-formed minerals suggests disequilibrium with host magmas. Aphanitic-porphyritic textures in hornblende gabbros suggest that disquilibrium was induced by decompression during entrainment in upwardly migrating differentiated magmas, which transported cumulate autocrysts and autoliths of coronitic gabbros into the shallow arc crust. Field relations coupled with a range in crystal accumulation textures and rock types supports a model for emplacement of the Summit gabbro in a dike-sill complex similar to the Torres del Paine of the Miocene Andean arc. Existing geochronology suggests that the Summit gabbro may represent a deeper expression of the Independence dike swarm.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Geological Sciences
- Creator:
- Palermo, Jennifer
- Description:
- Crystal Lake is a small (0.02 km2), alpine lake in the San Gabriel Mountains. This hydrologically closed lake is one of the very few permanent, freshwater lakes in the range. as a result, it is ideal for recording coastal southwestern US hydrologic variability. This study presents a 1300 year sub-decadally resolved reconstruction of extreme hydrologic events (i.e., floods). Regional records of late Holocene floods are scarce and largely limited to marine sediment archives, making this research integral to better prepare the highly-urbanized area for, and to mitigate the effects of, excess water. Sediment cores were obtained in May 2014 from the lake’s depocenter. Magnetic susceptibility, LOI 550°C and 950°C, and grain size were measured at 1 cm contiguous intervals; Corg:Ntotal ratios and bulk δ13Corg were measured every 2 cm. an age model was generated by linear regression of 8 AMS 14C dates of discrete organic matter. Age control for the past 200 years is based on correlation to Rothenberg et al. (2010) core ages. Fourteen storm-induced, rapidly deposited layers are distinguished and characterized from ambient sediments. Regionally, these rapidly deposited event layers occur during both wet and dry climate states. Forcings related to Pacific Ocean-atmosphere interactions are explored as potential drivers of these hydrologic events. Ultimately, the Crystal Lake record shows that large flood-producing storm events, likely caused by atmospheric rivers, have occurred in the late Holocene and will occur in the future, regardless of the background climate state.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of Geological Sciences
- Creator:
- Low, Joey
- Description:
- In 1406, the armies of the Ming dynasty (1368–1644) invaded Dai Viet, or present-day Vietnam. Zhu Di, or the Yongle emperor (r. 1403–1424), ousted Ho Quy Ly (1336–1407?) of the Ho dynasty (1400–1407), leading to an occupation of twenty years. Nearly ninety years later in 1494, the French army invaded Naples in southern Italy. Charles VIII (r. 1483–1498) then ousted the Aragonese dynasty, all the while proposing to use Naples as a base from which to start a crusade against the Ottomans. Both conquests did not last long. the Vietnamese defeated their oppressors in 1427. a coalition of European powers forced the French regime back to France in 1495. the French continued to invade Italy until 1559. Based on its comparison within a framework of narrative theory of the public narratives as presented by the Ming dynasty and French monarchy to justify their wars, this thesis shows that despite their geographical, contextual, political, and cultural differences, the Ming and French invasions possessed three major things in common and one disparity: (1) both the Ming emperor and the French kings utilized just war concepts rooted in ideological traditions in their public narratives; (2) these rulers relied on dubious historical claims to justify their wars; (3) internal and foreign ministers exerted tremendous influence on the creation of these wars; and (4) both narratives differed on the prevalence of prophecy, a recurring element in Italy, but not in China nor Vietnam.
- Resource Type:
- Masters Thesis
- Campus Tesim:
- Fullerton
- Department:
- Department of History