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- Genre: Masters Thesis
- Creators: Arizona State University
- Creators: Chakraborty, Bijeta
- Creators: Peterson, Cory
- Member of: ASU Electronic Theses and Dissertations
Description
This thesis focuses on justice, human rights, and migration in Iraq. It explores the ideas of justice and human rights, and how they influence the migration of the Iraqi Assyrians and Chaldeans. Through the use of qualitative methodology, including a review of scholarly literature, personal experience, and semi-formal interviews with ten individuals, this research mainly focuses on the influence that justice and human rights had on migration during the U.S.-Iraq War, from 2003 until 2011. Justice, human rights, and migration before and after the War are examined. The study concludes that justice and human rights are factors that influence the migration of Iraq's Assyrian and Chaldean community throughout the U.S.-Iraq War; however justice and human rights are not the only factors.
ContributorsBiya, Diana (Author) / Romero, Mary (Thesis advisor) / Ali, Souad T. (Thesis advisor) / El Hamel, Chouki (Committee member) / Arizona State University (Publisher)
Created2014
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
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
The education and criminal justice systems have developed in relation to one another, intersected through specific events, policies, practices, and discourses that have ultimately shaped the experiences and lives of children of color. Racism, white supremacy, and oppression are foundational to the United States and evident in all systems, structures, and institutions. Exploring the various contexts in which the education and criminal justice systems have developed illuminates their coalescence in contemporary United States society and more specifically, in public schools. Public schools now operate under discipline regimes that criminalize the behavior of Black and Brown children through exclusionary practices and zero-tolerance policies, surveillance and security measures, and school police. Children of color must navigate complex and interlocking systems of power in schools and the broader society that serve to criminalize, control, and incapacitate youth, effectively cementing a relationship between schools and prisons. Describing these complex and interlocking systems of power that exclude children from schools and force them into the criminal justice system as the “school-to-prison pipeline” is increasingly insufficient. The “school-prison nexus” more accurately and completely embodies the relationship between education, incarceration, and the political economy. In the United States, where capitalism reigns, the school-prison nexus serves as an economic imperative to further fuel the political economy, neoliberal globalization, and the prison-industrial complex. In both the education and criminal justice systems, Black and Brown children are commodified and exploited through the school-prison nexus as a mechanism to expand free-market capitalism.
ContributorsNunez-Eddy, Emily Nicole (Author) / Broberg, Gregory (Thesis advisor) / Swadener, Beth Blue (Committee member) / Theisen-Homer, Victoria (Committee member) / Arizona State University (Publisher)
Created2020
Description
The paper reviews some of the models of consequentialist justice, the nature of social contracts, and the social coordination of behaviors through social norms.
The challenge with actualizing justice in many contemporary societies is the broad and often conflicting individual beliefs on rights and responsibilities that each member of a society maintains to describe the opportunities and compensations they attribute to themselves and others. This obscurity is compounded through a lack of academic or political alignment on the definition and tenets of justice.
The result of the deficiency of commonality of the definition and tenants of justice often result in myopic decisions by individuals and discontinuity within a society that reduce the available rights, obligations, opportunities, and/or compensations that could be available through alternative modalities.
The paper begins by assessing the challenge of establishing mutual trust in order to achieve cooperation. I then examine utility enhancement strategies available through cooperation. Next, I turn to models that describe natural and artificial sources of social contacts, game theory, and evolutionary fitness to produce beneficial results. I then examine social norms, including the dual inheritance theory, as models which can selectively reinforce certain cooperative behaviors and reduce others. In conclusion, a possible connection among these models to improve the overall fitness of society as defined by the net average increase in available utility, rights, opportunities, and compensations is offered.
Through an examination of concepts that inform individual choice and coordination with others, concepts within social coordination, the nature of social contracts, and consequentialist justice to coordinate behaviors through social norms may illustrate an integrated perspective and, through additional examination, produce a comprehensive model to describe how societies could identify and foster just human coordination.
The challenge with actualizing justice in many contemporary societies is the broad and often conflicting individual beliefs on rights and responsibilities that each member of a society maintains to describe the opportunities and compensations they attribute to themselves and others. This obscurity is compounded through a lack of academic or political alignment on the definition and tenets of justice.
The result of the deficiency of commonality of the definition and tenants of justice often result in myopic decisions by individuals and discontinuity within a society that reduce the available rights, obligations, opportunities, and/or compensations that could be available through alternative modalities.
The paper begins by assessing the challenge of establishing mutual trust in order to achieve cooperation. I then examine utility enhancement strategies available through cooperation. Next, I turn to models that describe natural and artificial sources of social contacts, game theory, and evolutionary fitness to produce beneficial results. I then examine social norms, including the dual inheritance theory, as models which can selectively reinforce certain cooperative behaviors and reduce others. In conclusion, a possible connection among these models to improve the overall fitness of society as defined by the net average increase in available utility, rights, opportunities, and compensations is offered.
Through an examination of concepts that inform individual choice and coordination with others, concepts within social coordination, the nature of social contracts, and consequentialist justice to coordinate behaviors through social norms may illustrate an integrated perspective and, through additional examination, produce a comprehensive model to describe how societies could identify and foster just human coordination.
ContributorsHerro, C. R (Author) / Armendt, Brad (Thesis advisor) / McGregor, Joan (Committee member) / DesRoches, Tyler (Committee member) / Arizona State University (Publisher)
Created2019