Matching Items (236)
Description
Epilepsy affects numerous people around the world and is characterized by recurring seizures, prompting the ability to predict them so precautionary measures may be employed. One promising algorithm extracts spatiotemporal correlation based features from intracranial electroencephalography signals for use with support vector machines. The robustness of this methodology is tested through a sensitivity analysis. Doing so also provides insight about how to construct more effective feature vectors.
ContributorsMa, Owen (Author) / Bliss, Daniel (Thesis director) / Berisha, Visar (Committee member) / Barrett, The Honors College (Contributor) / Electrical Engineering Program (Contributor)
Created2015-05
Description
Passive radar can be used to reduce the demand for radio frequency spectrum bandwidth. This paper will explain how a MATLAB simulation tool was developed to analyze the feasibility of using passive radar with digitally modulated communication signals. The first stage of the simulation creates a binary phase-shift keying (BPSK) signal, quadrature phase-shift keying (QPSK) signal, or digital terrestrial television (DTTV) signal. A scenario is then created using user defined parameters that simulates reception of the original signal on two different channels, a reference channel and a surveillance channel. The signal on the surveillance channel is delayed and Doppler shifted according to a point target scattering profile. An ambiguity function detector is implemented to identify the time delays and Doppler shifts associated with reflections off of the targets created. The results of an example are included in this report to demonstrate the simulation capabilities.
ContributorsScarborough, Gillian Donnelly (Author) / Cochran, Douglas (Thesis director) / Berisha, Visar (Committee member) / Wang, Chao (Committee member) / Barrett, The Honors College (Contributor) / Electrical Engineering Program (Contributor) / School of Mathematical and Statistical Sciences (Contributor)
Created2014-05
Description
For the ancient Greeks, music not only was esteemed for its social and entertaining value, but also because it reflected the beauty of the gods and their creations. Music furthermore “embodied larger universal principles and served as a vehicle for higher understanding.” According to Lippmann, the ancients believed that the universe “contains a harmony that controls both spatial and temporal phenomena” and “we can come to know the divine order of harmony more readily in ourselves than in the external world.” Gaining self-knowledge and awareness of one’s place in the world are significant and music is a means of gaining this consciousness. Ancient Greeks believed that music was inspired by the Greek goddesses known as the Muses. In this paper, I argue that, by gifting humans with divinely inspired music, the Muses help humans achieve this mindfulness of one‟s place in the world and attain immortality.
ContributorsSanders, Lauren (Author) / Norton, Kay (Thesis director) / Arena, Paul (Committee member) / Bruhn, Karen (Committee member) / Barrett, The Honors College (Contributor) / Herberger Institute for Design and the Arts (Contributor)
Created2012-12
Description
As green buildings become more popular, the challenge of structural engineer is to move beyond simply green to develop sustainable, and high-performing buildings that are more than just environmentally friendly. For decades, Portland cement-based products have been known as the most commonly used construction materials in the world, and as a result, cement production is a significant source of global carbon dioxide (CO2) emissions, and environmental impacts at all stages of the process. In recent years, the increasing cost of energy and resource supplies, and concerns related to greenhouse gas emissions and environmental impacts have ignited more interests in utilizing waste and by-product materials as the primary ingredient to replace ordinary Portland cement in concrete systems. The environmental benefits of cement replacement are enormous, including the diversion of non-recycled waste from landfills for useful applications, the reduction in non-renewable energy consumption for cement production, and the corresponding emission of greenhouse gases. In the vast available body of literature, concretes consisting activated fly ash or slag as the binder have been shown to have high compressive strengths, and resistance to fire and chemical attack. This research focuses to utilize fly ash, by-product of coal fired power plant along with different alkaline solutions to form a final product with comparable properties to or superior than those of ordinary Portland cement concrete. Fly ash mortars using different concentration of sodium hydroxide and waterglass were dry and moist cured at different temperatures prior subjecting to uniaxial compressive loading condition. Since moist curing continuously supplies water for the hydration process of activated fly ash mortars while preventing thermal shrinkage and cracking, the samples were more durable and demonstrated a noticeably higher compressive strength. The influence of the concentration of the activating agent (4, or 8 M sodium hydroxide solution), and activator-to-binder ratio of 0.40 on the compressive strengths of concretes containing Class F fly ash as the sole binder is analyzed. Furthermore, liquid sodium silicate (waterglass) with silica modulus of 1.0 and 2.0 along with activator-to-binder ratio of 0.04 and 0.07 was also studied to understand its performance in contributing to the strength development of the activated fly ash concrete. Statistical analysis of the compressive strength results show that the available alkali concentration has a larger influence on the compressive strengths of activated concretes made using fly ash than the influence of curing parameters (elevated temperatures, condition, and duration).
ContributorsBanh, Kingsten Chi (Author) / Neithalath, Narayanan (Thesis director) / Rajan, Subramaniam (Committee member) / Mobasher, Barzin (Committee member) / Civil, Environmental and Sustainable Engineering Programs (Contributor) / Barrett, The Honors College (Contributor)
Created2013-05
Description
From Marathon to Athens was inspired by the legend of Pheidippides, a Greek messenger who ran approximately twenty-six miles between the cities of Marathon and Athens in ancient Greece to deliver an important wartime message. According to the legend, he died shortly after completing the journey. The marathon races of today were inspired by his story, though it may be more myth than reality. There is a great deal of inherent drama in the undertaking of such a feat, whether it be a marathon or any other test of strength and endurance. There is the rush of adrenaline when it begins, followed by the excitement and exhilaration of the first few miles. Then, there is a period of settling in and finding a groove - when the runner realizes that there is a long way to go, but is determined to pace him or herself and stay strong. All too often, there is the "wall" that appears about three-quarters of the way through, when it seems that there is no strength left to finish the race. Finally, there is the final push to the finish line - where the runner decides that they are going to make it, in spite of fatigue, pain, or any other obstacle. In this piece, I used a simple melody that was very loosely modeled after a melody from ancient Greece (the tune inscribed on the Epitaph of Seikilos). I used both Phrygian and Dorian modes, which, according to Plato, were most appropriate for soldiers. Throughout the piece, I used different instruments, mostly percussion, to represent the heartbeat of the runner. In the legend, the runner dies - in the piece, the heartbeat becomes very fast and then rather erratic. It then slows and, finally, stops. Though I find the story of Pheidippides inspiring, I wish all marathon runners and athletes of every kind (myself included) a safer and happier outcome!
ContributorsOsteen-Petreshock, Kimberly (Composer) / Hackbarth, Glenn (Thesis advisor) / Rockmaker, Jody (Committee member) / Levy, Benjamin (Committee member) / Norton, Kay (Committee member) / Arizona State University (Publisher)
Created2010
Description
W.A. Mozart was a masterful creator of music and drama as well as a keen observer of human relationships. Librettists were enamored of his ability to bring their words to life with his music. His truthful portrayal of human relationships, particularly involving women, was highly influenced by his own life experiences. Through these relationships he learned to create characters and music that clearly depict female sibling relationships in the eighteenth century. A review of educational opportunities for women during the eighteenth century, Mozart's personal relationships, as well as selected roles in his operas will help to explain Mozart's portrayal of the eighteenth-century female sibling stereotypes. While Mozart's self-centeredness is well documented in biographies by Cliff Eisen and Ruth Halliwell, and the argument can be made that he surrounded himself with females who fulfilled his needs, he was often drawn to operas in which he could advocate musically for a female character's liberation from the overbearing influence of powerful men. Although Mozart's "musically empowered" women appear in nearly every opera, for the purpose of this paper, I will focus on the characters of Così fan tutte's Fiordiligi and Dorabella, and Le Nozze di Figaro's Countess. First, however, a closer analysis of Mozart's early life and his relationships with his sister and mother is necessary. The ways Mozart set characters created by DaPonte and Beaumarchais cannot be separated from the ways he was taught to appreciate females in his family of origin. Social structure during the eighteenth century dictated a woman's education, responsibility to her family, and therefore, played a fundamental role in defining her life. This situation often created expectations within the birth order that had an impact on sibling relationships as well as individual personalities. Many social and familial influences are represented through the operas of Mozart. Così fan tutte (January 26, 1790) and Le Nozze di Figaro (May 1, 1786) both contain a central female sibling relationship that reflects aspects of Mozart's relationships with women throughout his life.
ContributorsWalker, Anne (Author) / Doan, Jerry (Thesis advisor) / Dreyfoos, Dale (Committee member) / May, Judy (Committee member) / Norton, Kay (Committee member) / Reber, William (Committee member) / Arizona State University (Publisher)
Created2010
Description
Peer-reviewed literature on the effects of sound and music on babies ranging from the prenatal period to the postnatal period, called the perinatal period moving forward, is vast. Substantial research has been directed towards the neural connections they make with sound, musical therapy, audio learning, and much more. The primary focus of this thesis was to review the current literature on how the father's voice affects the fetus during the perinatal period. During the preliminary research of the topic, the process faced an immediate problem as this concept had very little substantial sources. The number of relevant articles or documents with the term “father” in the title can be counted on one hand. In some cases, research that explored the father’s voice did so only as a supporting statistic or comparison to the main goal of exploring the mother’s voice. The mother’s voice has been prioritized as a research topic because of the immediate physical connection between the mother and the child throughout the entire pregnancy. The third semester of pregnancy is often a period of study since what the mother senses, says or does will somehow translate into an experience for the child’s developing brain. On the other hand, the father’s voice has been considered an environmental sound, a position justified by some researchers due to phenomena such as differing levels of fetal attention and observed “preference” of a newborn. The scarcity of research regarding the father’s voice, or the voice of a non-parental male, can be explained in several ways. These include the father’s potential absence due to work, inherited ideologies and biases against active parenting for the father, parental roles, and their unwillingness to utilize infant-directed speech and singing for psychological reasons, during the perinatal period, compared to that of the mother. Researching ways to deepen the relationship between the father and baby during the perinatal period, along with developing new biotechnologies for different kinds of evaluative tests, will help advance the subject matter of how the father’s voice impacts a baby to a larger scale.
ContributorsNguyen, Justin Dinh Huy (Author) / Norton, Kay (Thesis director) / Lefler, Scott (Committee member) / School of Music, Dance and Theatre (Contributor) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
The ability of cochlear implants (CI) to restore auditory function has advanced significantly in the past decade. Approximately 96,000 people in the United States benefit from these devices, which by the generation and transmission of electrical impulses, enable the brain to perceive sound. But due to the predominantly Western cochlear implant market, current CI characterization primarily focuses on improving the quality of American English. Only recently has research begun to evaluate CI performance using other languages such as Mandarin Chinese, which rely on distinct spectral characteristics not present in English. Mandarin, a tonal language utilizes four, distinct pitch patterns, which when voiced a syllable, conveys different meanings for the same word. This presents a challenge to hearing research as spectral, or frequency based information like pitch is readily acknowledged to be significantly reduced by CI processing algorithms. Thus the present study sought to identify the intelligibility differences for English and Mandarin when processed using current CI strategies. The objective of the study was to pinpoint any notable discrepancies in speech recognition, using voice-coded (vocoded) audio that simulates a CI generated stimuli. This approach allowed 12 normal hearing English speakers, and 9 normal hearing Mandarin listeners to participate in the experiment. The number of frequency channels available and the carrier type of excitation were varied in order to compare their effects on two cases of Mandarin intelligibility: Case 1) word recognition and Case 2) combined word and tone recognition. The results indicated a statistically significant difference between English and Mandarin intelligibility for Condition 1 (8Ch-Sinewave Carrier, p=0.022) given Case 1 and Condition 1 (8Ch-Sinewave Carrier, p=0.001) and Condition 3 (16Ch-Sinewave Carrier, p=0.001) given Case 2. The data suggests that the nature of the carrier type does have an effect on tonal language intelligibility and warrants further research as a design consideration for future cochlear implants.
ContributorsSchiltz, Jessica Hammitt (Author) / Berisha, Visar (Thesis director) / Frakes, David (Committee member) / Barrett, The Honors College (Contributor) / Harrington Bioengineering Program (Contributor)
Created2015-05
Description
The marmoset monkey (Callithrix jacchus) is a new-world primate species native to South America rainforests. Because they rely on vocal communication to navigate and survive, marmosets have evolved as a promising primate model to study vocal production, perception, cognition, and social interactions. The purpose of this project is to provide an initial assessment on the vocal repertoire of a marmoset colony raised at Arizona State University and call types they use in different social conditions. The vocal production of a colony of 16 marmoset monkeys was recorded in 3 different conditions with three repeats of each condition. The positive condition involves a caretaker distributing food, the negative condition involves an experimenter taking a marmoset out of his cage to a different room, and the control condition is the normal state of the colony with no human interference. A total of 5396 samples of calls were collected during a total of 256 minutes of audio recordings. Call types were analyzed in semi-automated computer programs developed in the Laboratory of Auditory Computation and Neurophysiology. A total of 5 major call types were identified and their variants in different social conditions were analyzed. The results showed that the total number of calls and the type of calls made differed in the three social conditions, suggesting that monkey vocalization signals and depends on the social context.
ContributorsFernandez, Jessmin Natalie (Author) / Zhou, Yi (Thesis director) / Berisha, Visar (Committee member) / School of International Letters and Cultures (Contributor) / Department of Psychology (Contributor) / School of Life Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
Detecting early signs of neurodegeneration is vital for measuring the efficacy of pharmaceuticals and planning treatments for neurological diseases. This is especially true for Amyotrophic Lateral Sclerosis (ALS) where differences in symptom onset can be indicative of the prognosis. Because it can be measured noninvasively, changes in speech production have been proposed as a promising indicator of neurological decline. However, speech changes are typically measured subjectively by a clinician. These perceptual ratings can vary widely between clinicians and within the same clinician on different patient visits, making clinical ratings less sensitive to subtle early indicators. In this paper, we propose an algorithm for the objective measurement of flutter, a quasi-sinusoidal modulation of fundamental frequency that manifests in the speech of some ALS patients. The algorithm detailed in this paper employs long-term average spectral analysis on the residual F0 track of a sustained phonation to detect the presence of flutter and is robust to longitudinal drifts in F0. The algorithm is evaluated on a longitudinal speech dataset of ALS patients at varying stages in their prognosis. Benchmarking with two stages of perceptual ratings provided by an expert speech pathologist indicate that the algorithm follows perceptual ratings with moderate accuracy and can objectively detect flutter in instances where the variability of the perceptual rating causes uncertainty.
ContributorsPeplinski, Jacob Scott (Author) / Berisha, Visar (Thesis director) / Liss, Julie (Committee member) / Electrical Engineering Program (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05