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Buck converters are a class of switched-mode power converters often used to step down DC input voltages to a lower DC output voltage. These converters naturally produce a current and voltage ripple at their output due to their switching action. Traditional methods of reducing this ripple have involved adding large discrete inductors and capacitors to filter the ripple, but large discrete components cannot be integrated onto chips. As an alternative to using passive filtering components, this project investigates the use of active ripple cancellation to reduce the peak output ripple. Hysteretic controlled buck converters were chosen for their simplicity of design and fast transient response. The proposed cancellation circuits sense the output ripple of the buck converter and inject an equal ripple exactly out of phase with the sensed ripple. Both current-mode and voltage-mode feedback loops are simulated, and the effectiveness of each cancellation circuit is examined. Results show that integrated active ripple cancellation circuits offer a promising substitute for large discrete filters.
ContributorsWang, Ziyan (Author) / Bakkaloglu, Bertan (Thesis director) / Kitchen, Jennifer (Committee member) / Electrical Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2017-12
Description
Science fiction works can reflect the relationship between science and society by telling a story set in the future of ethical implications or social consequences of scientific advancement. This thesis investigated how the concept of reproduction is depicted in popular science fiction works. I reviewed and analyzed four popular science fiction works that all showed fear over the government controlling our choices in reproductive technology. The analysis of my thesis can be used as a way to understand how we view the ideas and the consequences of reproductive technology through concepts of reproduction. These perspectives and ideas as a reflection of society's concerns as we discuss the future of the ethics and politics of reproductive technology and reproductive issues.
ContributorsKim, Grace Dayoung (Author) / Maienschein, Jane (Thesis director) / Ellison, Karin (Committee member) / Hurlbut, Ben (Committee member) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
This project focuses on techniques contemporary American poets use in their work. Ten different poetry collections are analyzed for dominant writing styles and techniques, which I then apply to my own poems, concentrating on modeling that particular poet. I then reflect on those poems through an evaluation of my writing process, how those techniques were implemented, and how they affected the poem. In addition to these reviews and reflections, I also wrote three articles about the literary community and what I've learned from my interactions in that community. All these materials are organized into a website, which shows the connections between the different writings via links and menus. Creating this website brings all the materials together to demonstrate my growth as a poet, writer, and designer. This heavy focus on poetry and analysis has helped sharpen my critical thinking skills and has better prepared me for a career in design and journalism.
ContributorsHansen, Elizabeth Sarah (Author) / Murphy, Patricia (Thesis director) / Savard, Jeannine (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor) / Hugh Downs School of Human Communication (Contributor) / Walter Cronkite School of Journalism and Mass Communication (Contributor)
Created2015-05
Description
This project was centered around designing a processor model (using the C programming language) based on the Coldfire computer architecture that will run on third party software known as Open Virtual Platforms. The end goal is to have a fully functional processor that can run Coldfire instructions and utilize peripheral devices in the same way as the hardware used in the embedded systems lab at ASU. This project would cut down the substantial amount of time students spend commuting to the lab. Having the processor directly at their disposal would also encourage them to spend more time outside of class learning the hardware and familiarizing themselves with development on an embedded micro-controller. The model will be accurate, fast and reliable. These aspects will be achieved through rigorous unit testing and use of the OVP platform which provides instruction accurate simulations at hundreds of MIPS (million instructions per second) for the specified model. The end product was able to accurately simulate a subset of the Coldfire instructions at very high rates.
ContributorsDunning, David Connor (Author) / Burger, Kevin (Thesis director) / Meuth, Ryan (Committee member) / Barrett, The Honors College (Contributor) / Computer Science and Engineering Program (Contributor)
Created2014-12
Description
This thesis examines contemporary cinematic adaptations of the Ovidian Pygmalion story. The films Blade Runner (1981), Lars and the Real Girl (2007), Ruby Sparks (2012), and Her (2013) are analyzed. This thesis seeks to understand why this particular myth is so resonant in today's popular culture and what this relevance reveals about modern society. The roles of female subjugation, sexualization, and relationship with technology will be major areas of concern. Research includes film criticism, Ovidian scholarship, and new advances in computer technology.
ContributorsStory, Sara Katherine (Author) / Corse, Taylor (Thesis director) / Ellis, Lawrence (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor)
Created2015-05
Description
Medical Humanities is a growing field and much scholarship focuses on the promotion of empathy in professionals. I argue incorporation of literature is crucial as it develops critical thinking skills that guard against the dangers of collective thought. A Foucauldian analysis of three literary works, my own creative non-fiction short story, William Carlos Williams' "The Use of Force," and Alexander Solzhenitsyn's Cancer Ward offer the student perspective, the doctor perspective and the institutional perspective, respectively, and subversive undertones offer an example of the analytical thought developed in humanities education by challenging assumptions and elucidating implicit power relations in the medical institution.
ContributorsBlock, Courtney Samantha (Author) / Lussier, Mark (Thesis director) / Fox, Cora (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor)
Created2015-05
Description
This project examines the literary figures of Tristan and Isolde, looking to see how each character is portrayed, how their portrayals change through time, and takes a socio-cultural perspective in attempts to explain why these portrayals were used, and why they changed. Three different versions of the Tristan and Isolde story from three different time periods were used: Le Morte Darthur by Sir Thomas Malory from the 1400's, Idylls of The King by Lord Alfred Tennyson from the 1800's, and the film Tristan + Isolde distributed by 20th Century Fox in the mid 2000's. For each version of the story, the primary text or film, along with secondary sources, were used to determine how each character was portrayed. This was done by examining Tristan and Isolde's physical appearances, stations in life, actions, and personality/tone. These portrayals from each version were then compared with portrayals from the other versions to determine what changes had occurred. Finally, secondary textual information was used to examine the culture in which each version was originally published, specifically examining such socio-cultural changes that could explain why the previously determined portrayals of Tristan and Isolde were used and why they differ from versions of these characters from different time periods. The results of this study found that some characteristics of Tristan and Isolde's portrayals do not change through time. Specifically, their physical appearances and stations in life are, for the most part, fixed. Tristan is always a handsome, strong, and noble knight/warrior while Isolde is always a beautiful and delicate princess. Other characteristics, such as personality/tone and actions do change drastically from one version to the next in accordance with the changing culture in which the authors and audience members lived.
ContributorsKupsch, Mary Francis (Author) / Newhauser, Richard (Thesis director) / Haggins, Bambi (Committee member) / Barrett, The Honors College (Contributor) / School of Human Evolution and Social Change (Contributor) / Department of English (Contributor)
Created2015-05
Description
The world of a hearing impaired person is much different than that of somebody capable of discerning different frequencies and magnitudes of sound waves via their ears. This is especially true when hearing impaired people play video games. In most video games, surround sound is fed through some sort of digital output to headphones or speakers. Based on this information, the gamer can discern where a particular stimulus is coming from and whether or not that is a threat to their wellbeing within the virtual world. People with reliable hearing have a distinct advantage over hearing impaired people in the fact that they can gather information not just from what is in front of them, but from every angle relative to the way they're facing. The purpose of this project was to find a way to even the playing field, so that a person hard of hearing could also receive the sensory feedback that any other person would get while playing video games To do this, visual surround sound was created. This is a system that takes a surround sound input, and illuminates LEDs around the periphery of glasses based on the direction, frequency and amplitude of the audio wave. This provides the user with crucial information on the whereabouts of different elements within the game. In this paper, the research and development of Visual Surround Sound is discussed along with its viability in regards to a deaf person's ability to learn the technology, and decipher the visual cues.
ContributorsKadi, Danyal (Co-author) / Burrell, Nathaneal (Co-author) / Butler, Kristi (Co-author) / Wright, Gavin (Co-author) / Kosut, Oliver (Thesis director) / Bliss, Daniel (Committee member) / Barrett, The Honors College (Contributor) / Electrical Engineering Program (Contributor)
Created2015-05
Description
In my thesis paper, I examine the gothic elements found in classical gothic fairy tales from European and Japanese tradition, particularly those works by the Brothers Grimm and Yei Theodora Ozaki. By examining the principle gothic elements that are unique to both stories, and further analyzing the commonalities of story, plot, and other major tropes, a better understanding of the message meant to be imparted and other cultural nuances can be ascertained. Gothic literature creates an atmosphere of gloom and suspense, toying with concepts of dread and darkness by employing Gothic elements such as shadows, the supernatural, sinister buildings, and strong-willed villains, all of which affect the rational mind in an irrational way. Fairytales freely use such tropes to their advantage, playing with the many fears of children, while simultaneously painting an idealistic fantasy world. The degree of usage and the application of gothic elements is closely examined in the Grimm works, "Hansel and Gretel," and "The Robber Bridegroom," as well as the Japanese tales, "The Goblin of Adachigahra,""Kintaro the Golden Boy" and "The Monkey and the Crab." These stories have been chosen due for their usage of animal tricksters, themes of control, and aspects of isolation, supernatural entities, and substantial gothic imagery. The gothic elements of death, sinister older women, the supernatural, fears of abandonment, and cunning animals are akin to both Western and Eastern tales, while the concept of gothic setting and the type of monsters prepared to feast on men is significantly different for both cultures, similar lessons are intended to be gleaned by children from these tales, with the intention of generally producing positive results \u2014 while the means differ, the message is strikingly similar, yet there remain cultural differences in terms of central themes and character traits.The effect of re-introducing the darker, gothic elements of traditional fairy tales into modern literature and retellings of the original narratives has been profound.Today, whether it has been at the bequest of the public or simply a new-age movement by modern cinema audience for the "gritty and realistic," fairy tales are returning to their former gothic forms. "Snow White and The Huntsman" is one example of a film which has gone this route, opting for a more gothic, classic telling rather than the chip, cheery, rosy cheeked Disney versions. There is a tendency for most media nowadays to be far less censored and fantastical, aiming for a more realistic, grittier approach \u2014 this bleeds into film and literature likewise, and thus children are impacted by this shift as well. Children seem to be able to handle more, perhaps desensitized at younger and younger ages by the products of our widely consumerist society, or perhaps due to parents raising their children in such a way so that the darkness that tinges these tales doesn't disturb and derail but rather, emphasizes their meaning of teaching certain lessons. Tales such as these are still valuable, and will continue to be so long as we seek a reality greater than our own, where the evil of the world is wiped away, and we all live happily ever after.
ContributorsMoschonas, Jerasimos Theodore (Author) / Ellis, Lawrence (Thesis director) / Hoyt, Heather (Committee member) / Barrett, The Honors College (Contributor) / Department of English (Contributor)
Created2015-05
Description
"Chronos" is a composition by the great jazz pianist, Aaron Parks. Originally arranged for a quartet consisting of piano, upright bass, drums and tenor saxophone, I sought to arrange the piece for a sextet consisting of trombone, alto saxophone, tenor saxophone, guitar, upright, bass, and drums. This thesis outlines my process as I transcribed "Chronos" from the original recording and then arranged it for a new ensemble. It also discusses the difficulties faced in all the phases of the project from transcribing to rehearsing and performing the work. My arrangement is included with the thesis for those who wish to analyze the music as well as a recording of a live performance of my arrangement at The Nash in downtown Phoenix on April 7th, 2015.
ContributorsMcdaniel, Sean Wesley (Author) / Kocour, Michael (Thesis director) / Haines, Ryan (Committee member) / Barrett, The Honors College (Contributor) / School of Music (Contributor)
Created2015-05