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- Genre: Masters Thesis
- Creators: Arizona State University
- Creators: Chakraborty, Bijeta
- Member of: ASU Electronic Theses and Dissertations
Description
Believe It! is an animated interactive computer program that delivers cognitive restructuring to adolescent females' irrational career beliefs. It challenges the irrational belief and offers more reasonable alternatives. The current study investigated the potentially differential effects of Asian versus Caucasian animated agents in delivering the treatment to young Chinese American women. The results suggested that the Asian animated agent was not significantly superior to the Caucasian animated agent. Nor was there a significant interaction between level of acculturation and the effects of the animated agents. Ways to modify the Believe It! program for Chinese American users were recommended.
ContributorsZhang, Xue (Author) / Horan, John J (Thesis advisor) / Homer, Judith (Committee member) / Atkinson, Robert (Committee member) / Arizona State University (Publisher)
Created2013
Description
Efficiency of components is an ever increasing area of importance to portable applications, where a finite battery means finite operating time. Higher efficiency devices need to be designed that don't compromise on the performance that the consumer has come to expect. Class D amplifiers deliver on the goal of increased efficiency, but at the cost of distortion. Class AB amplifiers have low efficiency, but high linearity. By modulating the supply voltage of a Class AB amplifier to make a Class H amplifier, the efficiency can increase while still maintaining the Class AB level of linearity. A 92dB Power Supply Rejection Ratio (PSRR) Class AB amplifier and a Class H amplifier were designed in a 0.24um process for portable audio applications. Using a multiphase buck converter increased the efficiency of the Class H amplifier while still maintaining a fast response time to respond to audio frequencies. The Class H amplifier had an efficiency above the Class AB amplifier by 5-7% from 5-30mW of output power without affecting the total harmonic distortion (THD) at the design specifications. The Class H amplifier design met all design specifications and showed performance comparable to the designed Class AB amplifier across 1kHz-20kHz and 0.01mW-30mW. The Class H design was able to output 30mW into 16Ohms without any increase in THD. This design shows that Class H amplifiers merit more research into their potential for increasing efficiency of audio amplifiers and that even simple designs can give significant increases in efficiency without compromising linearity.
ContributorsPeterson, Cory (Author) / Bakkaloglu, Bertan (Thesis advisor) / Barnaby, Hugh (Committee member) / Kiaei, Sayfe (Committee member) / Arizona State University (Publisher)
Created2013
Description
This project examines the intersections between sexual/cultural cross-dressing and un/documented immigration from the point of view of folklore and immigration studies using Sui Sin Far's short story collection Mrs. Spring Fragrance and Karen Tei Yamashita's novel Tropic of Orange. Using the lenses of folklore theory and cross-dressing highlights aspects of immigration (and its intersection with gender and race) that are otherwise missed; it is necessary to examine the evolving ways in which fictionalized cross-dressers re-craft and occupy the spaces from which they are barred in order to address and redress questions of immigration today. Incorporating anthropology, history, folkloristics, and gender studies, this project shows that historical forms of cross-dressing and immigration lead to the development of unstable identities and pressures to "re-dress" and return to one's original space. More recent studies about gender, however, reveal a historical change in how cross-dressers negotiate their identities and the space(s) they inhabit. Therefore, it is crucial to inspect cross-dressing and immigration as both historical and contemporary phenomena. While Mrs. Spring Fragrance (published in 1912) represents more conventional ideas of cross-dressing and immigration, Tropic of Orange (published in 1997) offers alternative ways to navigate borders, immigration, and identity by using these concepts more playfully and self-consciously. Although sexual/cultural cross-dressing and un/documented immigration are not the same in every case, there are enough similarities between the two to warrant investigating whether some of the solutions reached by modern cross-dressers and gender-ambiguous people might not also help un/documented immigrants to re-negotiate their status, identities, and spaces in the midst of an unstable and at times hostile environment. In fact, an examination of such intersections can address and redress immigration by changing the perceptions of how, and the contexts in which, people view immigration and borders. Thus, this project contends that it is the combination of folkloristics, gender and immigration studies, Mrs. Spring Fragrance, and Tropic of Orange together that precipitates such a reading.
ContributorsZheng, Ding Ding (Author) / Sadowski-Smith, Claudia (Thesis advisor) / Adamson, Joni (Thesis advisor) / Horan, Elizabeth (Committee member) / Arizona State University (Publisher)
Created2013
Description
Class D Amplifiers are widely used in portable systems such as mobile phones to achieve high efficiency. The demands of portable electronics for low power consumption to extend battery life and reduce heat dissipation mandate efficient, high-performance audio amplifiers. The high efficiency of Class D amplifiers (CDAs) makes them particularly attractive for portable applications. The Digital class D amplifier is an interesting solution to increase the efficiency of embedded systems. However, this solution is not good enough in terms of PWM stage linearity and power supply rejection. An efficient control is needed to correct the error sources in order to get a high fidelity sound quality in the whole audio range of frequencies. A fundamental analysis on various error sources due to non idealities in the power stage have been discussed here with key focus on Power supply perturbations driving the Power stage of a Class D Audio Amplifier. Two types of closed loop Digital Class D architecture for PSRR improvement have been proposed and modeled. Double sided uniform sampling modulation has been used. One of the architecture uses feedback around the power stage and the second architecture uses feedback into digital domain. Simulation & experimental results confirm that the closed loop PSRR & PS-IMD improve by around 30-40 dB and 25 dB respectively.
ContributorsChakraborty, Bijeta (Author) / Bakkaloglu, Bertan (Thesis advisor) / Garrity, Douglas (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2012
Description
In this thesis, a digital input class D audio amplifier system which has the ability
to reject the power supply noise and nonlinearly of the output stage is presented. The main digital class D feed-forward path is using the fully-digital sigma-delta PWM open loop topology. Feedback loop is used to suppress the power supply noise and harmonic distortions. The design is using global foundry 0.18um technology.
Based on simulation, the power supply rejection at 200Hz is about -49dB with
81dB dynamic range and -70dB THD+N. The full scale output power can reach as high as 27mW and still keep minimum -68dB THD+N. The system efficiency at full scale is about 82%.
to reject the power supply noise and nonlinearly of the output stage is presented. The main digital class D feed-forward path is using the fully-digital sigma-delta PWM open loop topology. Feedback loop is used to suppress the power supply noise and harmonic distortions. The design is using global foundry 0.18um technology.
Based on simulation, the power supply rejection at 200Hz is about -49dB with
81dB dynamic range and -70dB THD+N. The full scale output power can reach as high as 27mW and still keep minimum -68dB THD+N. The system efficiency at full scale is about 82%.
ContributorsBai, Jing (Author) / Bakkaloglu, Bertan (Thesis advisor) / Arizona State University (Publisher)
Created2015
Description
With the push towards interdisciplinary approaches, there has been tremendous growth of scholarship in the comparative ethnic studies field. From studies on multiracial people, to residential segregation, to the study of multiracial spaces, there is a lot to say about cross-cultural experiences. “Te de Boba” explores the relationship between identity, race, and ethnicity of millennials through a food studies lens. In particular, I analyze the role of food spaces and food pathways in developing identity and conceptions of race and ethnicity. My research site consists of a small business, a boba tea shop in Baldwin Park, California: What happens when a boba shop opens up in downtown Baldwin Park, a predominantly Latinx community? How do interethnic relationships shape the structure and city landscape of Baldwin Park, and how do these experiences in turn shape self-identity among millennials? I draw from qualitative interviews, cognitive mapping, and surveys conducted within the boba shop to understand millennial identity formation in Baldwin Park. Millennials growing up in Baldwin Park experience unique relationships between cultures, foods, and lifestyles that cross ethnic and racial barriers, creating new forms of community, which I call hub cities. I develop “hub cities” as new terminology for discussing suburban spaces that foster a sense of community within suburban areas that challenges and break down popular discourse of race and ethnicity, giving way for youth creation of alternative discourses on race and ethnicity, consequently shaping the way they form self-identity.
ContributorsSantizo, Natalie (Author) / Cheng, Wendy (Thesis advisor) / Guevarra, Jr., Rudy (Committee member) / Fonow, Mary M (Committee member) / Arizona State University (Publisher)
Created2016
Description
The Hong Kong-born Canadian photographer and performance artist Tseng Kwong Chi mostly worked in the United States until the year he died in 1990. Upon arriving in New York in 1979, he started his career with a new name. By dropping his anglicized name Joseph and replacing it with his Chinese given name Kwong Chi, Tseng made a clear statement: this is my staged persona who refuses to assimilate to Western culture. This thesis deconstructs Tseng’s key works, including his party-crashing Met series, the decade-long East Meets West series, and the extended Expeditionary series. With his persona disguised by wearing a Mao suit and a pair of sunglasses, I argue that Tseng was a pioneer in the genre of Asian American performance photography and that his work foreshadowed the cultural jamming movement in his innovative use of détournement while it also critically comments on orientalism, cultural fetish, and Asian identity politics. Additionally, Tseng’s work served as a bridge, connecting art history with issues of Asian American identity. As a gay artist who worked mostly in the United States, his work was an early example of what Jachinson Chan has suggested as an alternative model of masculinity for Asian American men: that Asian American men can be free, independent, expressive, and willing to embrace femininity with their masculinity. As David Eng has argued, Tseng also bridged the fields of Asian American queer studies and diaspora studies. Moreover, Tseng carried the legacy of the first-generation Chinese American artists in the medium of photography and inspired the next generation of diasporic artists to explore Asian identity, and to contest the image of Mao and the power dynamics between East and West.
ContributorsWei, Xin (Author) / Mesch, Claudia (Thesis advisor) / Hoy, Meredith (Committee member) / Kuo, Karen (Committee member) / Arizona State University (Publisher)
Created2022
Description
Despite his critical role in the development of American Surrealism, Abstract Expressionism, and Postwar Assemblage, gay Filipino-American artist Alfonso Ossorio remains at the margins of the historiography of these movements. Born in Manila, Philippines, the artist immigrated to the United States in 1930 where he lived and worked until his death in 1990 at his home city of East Hampton, New York. He is among the few Philippine-descended artists living in 20th-century America producing museum-collected works. Since America’s colonial occupation of the Philippines in the 19th-century, immigration has been increasing as a result of migrant labor, military recruitment, and economic exchange. However, the Philippine diaspora’s artistic contributions and visual identity before 1980 are largely under-researched in the United States. Queer artists of color, especially Filipinx-Americans, rarely feature in the dominant narratives of American modernity. Ossorio deeply inflected the trajectory of the American avant-garde yet his marginal place in the history demonstrates how art communities excluded queer and Philippine-American identities in the 20th-century during the development of two major American modernist movements. The scholarship has increased since Ossorio’s death in 1990 as a result of museum and gallery exhibitions. Previous writers focus on biographical description or contextualize Ossorio’s work within a broad movement category without considering Ossorio’s Filipino-American and gay identities in advanced detail from queer and critical race frameworks. These studies lack specific theoretical analysis around race, sexuality, and colonialism on Ossorio’s identity and his artistic communities. Through the analysis of his paintings and archival documents, this thesis argues that Ossorio’s negotiation of these intersecting minority categories is central to understanding his artistic production and his relationship to the American avant-garde. This research applies the current literature on queer theory, critical race theory, and postcolonial theory on Filipinx-American identity to Ossorio’s life and artwork. I center the work of Philippine psychologist Virgilio G. Enriquez with additions from Filipinx-American scholars Martin F. Manalansan IV, Vicente Rafael, Denise Cruz and American scholars art historian Richard Meyer and queer theorist Judith Butler when examining the artworks Untitled 1944 (1944) and Astonished Mother (1950) in the context of Surrealism and Abstract Expressionism respectively.
ContributorsMiranda, Matthew Villar (Author) / Afanador-Pujol, Angélica J. (Thesis advisor) / Mesch, Claudia (Committee member) / Bailey, Marlon M. (Committee member) / Guevarra Jr., Rudy P. (Committee member) / Arizona State University (Publisher)
Created2021
Description
With the recent boom in artificial intelligence, various learning methods and information are pouring out. However, there are many abbreviations and jargons to read without knowing the history and development trend of artificial intelligence, which is a barrier to entry. This study predicts the future development direction by synthesizing the concept of Neuro symbolic AI, which is a new direction of artificial intelligence, the history of artificial intelligence from which such concept came out, and applied studies, and by synthesizing and summarizing the limitations of the current research projects. It is a guide for those who want to study neural symbols. In this paper, it describes the history of artificial intelligence and the historical background of the emergence of neural symbols. In the development trend, the challenges faced by the neural symbolic, measures to overcome, and the Neuro Symbolic A.I. applied in various fields are described. (Knowledge based Question Answering, VQA(Visual Question Answering), image retrieve, etc.). It predicts the future development direction of neuro symbolic artificial intelligence based on the contents obtained through previous studies.
ContributorsChoy, Kumhee (Author) / Yang, Yezhou (Thesis advisor) / Yang, Yingzhen (Committee member) / Bansal, Ajay (Committee member) / Arizona State University (Publisher)
Created2021