Matching Items (340)
Description
The ability to identify unoccupied resources in the radio spectrum is a key capability for opportunistic users in a cognitive radio environment. This paper draws upon and extends geometrically based ideas in statistical signal processing to develop estimators for the rank and the occupied subspace in a multi-user environment from multiple temporal samples of the signal received at a single antenna. These estimators enable identification of resources, such as the orthogonal complement of the occupied subspace, that may be exploitable by an opportunistic user. This concept is supported by simulations showing the estimation of the number of users in a simple CDMA system using a maximum a posteriori (MAP) estimate for the rank. It was found that with suitable parameters, such as high SNR, sufficient number of time epochs and codes of appropriate length, the number of users could be correctly estimated using the MAP estimator even when the noise variance is unknown. Additionally, the process of identifying the maximum likelihood estimate of the orthogonal projector onto the unoccupied subspace is discussed.
ContributorsBeaudet, Kaitlyn (Author) / Cochran, Douglas (Thesis advisor) / Turaga, Pavan (Committee member) / Berisha, Visar (Committee member) / Arizona State University (Publisher)
Created2014
Description
Motion estimation is a core task in computer vision and many applications utilize optical flow methods as fundamental tools to analyze motion in images and videos. Optical flow is the apparent motion of objects in image sequences that results from relative motion between the objects and the imaging perspective. Today, optical flow fields are utilized to solve problems in various areas such as object detection and tracking, interpolation, visual odometry, etc. In this dissertation, three problems from different areas of computer vision and the solutions that make use of modified optical flow methods are explained.
The contributions of this dissertation are approaches and frameworks that introduce i) a new optical flow-based interpolation method to achieve minimally divergent velocimetry data, ii) a framework that improves the accuracy of change detection algorithms in synthetic aperture radar (SAR) images, and iii) a set of new methods to integrate Proton Magnetic Resonance Spectroscopy (1HMRSI) data into threedimensional (3D) neuronavigation systems for tumor biopsies.
In the first application an optical flow-based approach for the interpolation of minimally divergent velocimetry data is proposed. The velocimetry data of incompressible fluids contain signals that describe the flow velocity. The approach uses the additional flow velocity information to guide the interpolation process towards reduced divergence in the interpolated data.
In the second application a framework that mainly consists of optical flow methods and other image processing and computer vision techniques to improve object extraction from synthetic aperture radar images is proposed. The proposed framework is used for distinguishing between actual motion and detected motion due to misregistration in SAR image sets and it can lead to more accurate and meaningful change detection and improve object extraction from a SAR datasets.
In the third application a set of new methods that aim to improve upon the current state-of-the-art in neuronavigation through the use of detailed three-dimensional (3D) 1H-MRSI data are proposed. The result is a progressive form of online MRSI-guided neuronavigation that is demonstrated through phantom validation and clinical application.
The contributions of this dissertation are approaches and frameworks that introduce i) a new optical flow-based interpolation method to achieve minimally divergent velocimetry data, ii) a framework that improves the accuracy of change detection algorithms in synthetic aperture radar (SAR) images, and iii) a set of new methods to integrate Proton Magnetic Resonance Spectroscopy (1HMRSI) data into threedimensional (3D) neuronavigation systems for tumor biopsies.
In the first application an optical flow-based approach for the interpolation of minimally divergent velocimetry data is proposed. The velocimetry data of incompressible fluids contain signals that describe the flow velocity. The approach uses the additional flow velocity information to guide the interpolation process towards reduced divergence in the interpolated data.
In the second application a framework that mainly consists of optical flow methods and other image processing and computer vision techniques to improve object extraction from synthetic aperture radar images is proposed. The proposed framework is used for distinguishing between actual motion and detected motion due to misregistration in SAR image sets and it can lead to more accurate and meaningful change detection and improve object extraction from a SAR datasets.
In the third application a set of new methods that aim to improve upon the current state-of-the-art in neuronavigation through the use of detailed three-dimensional (3D) 1H-MRSI data are proposed. The result is a progressive form of online MRSI-guided neuronavigation that is demonstrated through phantom validation and clinical application.
ContributorsKanberoglu, Berkay (Author) / Frakes, David (Thesis advisor) / Turaga, Pavan (Thesis advisor) / Spanias, Andreas (Committee member) / Berisha, Visar (Committee member) / Arizona State University (Publisher)
Created2018
Description
When dancers are granted agency over music, as in interactive dance systems, the actors are most often concerned with the problem of creating a staged performance for an audience. However, as is reflected by the above quote, the practice of Argentine tango social dance is most concerned with participants internal experience and their relationship to the broader tango community. In this dissertation I explore creative approaches to enrich the sense of connection, that is, the experience of oneness with a partner and complete immersion in music and dance for Argentine tango dancers by providing agency over musical activities through the use of interactive technology. Specifically, I create an interactive dance system that allows tango dancers to affect and create music via their movements in the context of social dance. The motivations for this work are multifold: 1) to intensify embodied experience of the interplay between dance and music, individual and partner, couple and community, 2) to create shared experience of the conventions of tango dance, and 3) to innovate Argentine tango social dance practice for the purposes of education and increasing musicality in dancers.
ContributorsBrown, Courtney Douglass (Author) / Paine, Garth (Thesis advisor) / Feisst, Sabine (Committee member) / Turaga, Pavan (Committee member) / Arizona State University (Publisher)
Created2017
Description
Calls for changes in science education over the last several decades have contributed to a changing landscape of undergraduate life science education. As opposed to simply lecturing at students and expecting them to recite science facts, there has been a strong push to make systemic changes so that students not only know pertinent science content, but also walk away with critical science process skills. There have been suggestions to create environments that focus on goals such as evaluating scientific evidence and explanations, understanding the development of scientific knowledge, and participating in scientific practice and discourse. As a part of the call for increases in student participation in science practice, we’ve seen suggestions to increase student exposure to the tools, techniques, and published research within various science fields. The use of primary scientific literature in the classroom is documented as being a tool to introduce students to the nature of scientific reasoning, experimental design, and knowledge creation and transformation. Many of the current studies on primary scientific literature in undergraduate courses report on intensive course designs in which students interact with the material with very specific goals, as outlined by the authors and researchers. We know less about the practices that take place in typical undergraduate settings. This exploratory study looks at information provided by a national sample of faculty that alludes to what sort of practices are taking place and the reasoning for doing so. Through analysis of both closed-ended and open-ended survey questions we have found that faculty are engaging students with primary scientific literature for many reasons and in a variety of ways. We have also attempted to characterize the way in which faculty view the body of scientific literature, as members of the research community. We discuss the implications of faculty views on the utility and value of the body of scientific literature. We also argue that those perceptions inform how the material is used in the undergraduate classroom.
ContributorsWagoner, Nevada (Author) / Brownell, Sara (Thesis advisor) / Maienschein, Jane (Thesis advisor) / Ellison, Karin (Committee member) / Arizona State University (Publisher)
Created2016
Description
The human motion is defined as an amalgamation of several physical traits such as bipedal locomotion, posture and manual dexterity, and mental expectation. In addition to the “positive” body form defined by these traits, casting light on the body produces a “negative” of the body: its shadow. We often interchangeably use with silhouettes in the place of shadow to emphasize indifference to interior features. In a manner of speaking, the shadow is an alter ego that imitates the individual.
The principal value of shadow is its non-invasive behaviour of reflecting precisely the actions of the individual it is attached to. Nonetheless we can still think of the body’s shadow not as the body but its alter ego.
Based on this premise, my thesis creates an experiential system that extracts the data related to the contour of your human shape and gives it a texture and life of its own, so as to emulate your movements and postures, and to be your extension. In technical terms, my thesis extracts abstraction from a pre-indexed database that could be generated from an offline data set or in real time to complement these actions of a user in front of a low-cost optical motion capture device like the Microsoft Kinect. This notion could be the system’s interpretation of the action which creates modularized art through the abstraction’s ‘similarity’ to the live action.
Through my research, I have developed a stable system that tackles various connotations associated with shadows and the need to determine the ideal features that contribute to the relevance of the actions performed. The implication of Factor Oracle [3] pattern interpretation is tested with a feature bin of videos. The system also is flexible towards several methods of Nearest Neighbours searches and a machine learning module to derive the same output. The overall purpose is to establish this in real time and provide a constant feedback to the user. This can be expanded to handle larger dynamic data.
In addition to estimating human actions, my thesis best tries to test various Nearest Neighbour search methods in real time depending upon the data stream. This provides a basis to understand varying parameters that complement human activity recognition and feature matching in real time.
The principal value of shadow is its non-invasive behaviour of reflecting precisely the actions of the individual it is attached to. Nonetheless we can still think of the body’s shadow not as the body but its alter ego.
Based on this premise, my thesis creates an experiential system that extracts the data related to the contour of your human shape and gives it a texture and life of its own, so as to emulate your movements and postures, and to be your extension. In technical terms, my thesis extracts abstraction from a pre-indexed database that could be generated from an offline data set or in real time to complement these actions of a user in front of a low-cost optical motion capture device like the Microsoft Kinect. This notion could be the system’s interpretation of the action which creates modularized art through the abstraction’s ‘similarity’ to the live action.
Through my research, I have developed a stable system that tackles various connotations associated with shadows and the need to determine the ideal features that contribute to the relevance of the actions performed. The implication of Factor Oracle [3] pattern interpretation is tested with a feature bin of videos. The system also is flexible towards several methods of Nearest Neighbours searches and a machine learning module to derive the same output. The overall purpose is to establish this in real time and provide a constant feedback to the user. This can be expanded to handle larger dynamic data.
In addition to estimating human actions, my thesis best tries to test various Nearest Neighbour search methods in real time depending upon the data stream. This provides a basis to understand varying parameters that complement human activity recognition and feature matching in real time.
ContributorsSeshasayee, Sudarshan Prashanth (Author) / Sha, Xin Wei (Thesis advisor) / Turaga, Pavan (Thesis advisor) / Tinapple, David A (Committee member) / Arizona State University (Publisher)
Created2016
Description
Nearly seven decades ago, the US government established grants to the states for family planning and acknowledged the importance of enabling all women to plan and space their pregnancies, regardless of personal income. Since then, publicly-funded family planning services have empowered millions of women, men, and adolescents to achieve their childbearing goals. Despite the recognized importance of subsidized family planning, services remain funded in a piecemeal fashion. Since the 1940s there have been numerous federal funding sources for family planning, including the Title V Maternal and Child Health Services Program, Office of Economic Opportunity grants, Title XX Social Services Program, Title X Family Planning Program, Medicaid, and the State Children’s Health Insurance Program, alongside state and local support. Spending guidelines allow states varying degrees of flexibility regarding allocation, to best serve the local population. With nearly two billion dollars spent annually on subsidized family planning, criticism often arises surrounding effective local program spending and state politics influencing grant allocation. Political tension regarding the amount of control states should have in managing federal funding is exacerbated in the context of family planning, which has become increasingly controversial among social conservatives in the twenty-first century. This thesis examines how Arizona’s political, geographic, cultural, and ethnic landscape shaped the state management of federal family planning funding since the early twentieth century. Using an extensive literature review, archival research, and oral history interviews, this thesis demonstrates the unique way Arizona state agencies and nonprofits collaborated to maximize the use of federal family planning grants, effectively reaching the most residents possible. That partnership allowed Arizona providers to reduce geographic barriers to family planning in a rural, frontier state. The social and political history surrounding the use of federal family planning funds in Arizona demonstrates the important role states have in efficient, effective, and equitable state implementation of national resources in successfully reaching local populations. The contextualization of government funding of family planning provides insight into recent attempts to defund abortion providers like Planned Parenthood, cut the Title X Family Planning Program, and restructure Medicaid in the twenty-first century.
ContributorsNunez-Eddy, Claudia (Author) / Maienschein, Jane (Thesis advisor) / Hurlbut, James (Committee member) / O'Neil, Erica (Committee member) / Arizona State University (Publisher)
Created2018
Description
Relationship marketing is a framework in which marketers aim to build two-way bonds with their customers, with the result of long-term benefits to both parties. The rise of social media and the prominence of digital marketing in general, including targeted ads, commercial websites, and email campaigns, has increased the potential for brands and organizations to build such relationships with current and potential customers over time. In the realm of politics, digital marketing has been brought to the mainstream throughout the last decade and its prominence in presidential campaigns has increased ever since, closing the gap in communication between voters, organizations, and candidates. This thesis is an exploration of the effect digital marketing had on Arizona State University students’ perceptions of the presidential candidates and political organizations targeting them during the 2020 election season. The ASU Young Democrats, ASU College Republicans, ASU Undergraduate Student Government, and the 2020 Trump and Biden campaigns were studied through three methods: an analysis of each organization’s marketing tactics through the lens of relationship marketing, interviews with each ASU subject, and a survey of 328 students. The conclusion offers recommendations to each subject based on hypotheses formulated from the analyses and discusses the interrelationship that subjects’ relationship marketing strengths and weaknesses had with students’ views of each organization relative to their desired perceptions.
ContributorsPyle, Karuna B. (Author) / Eaton, John (Thesis director) / Ingram-Waters, Mary (Committee member) / Department of Marketing (Contributor) / Department of Information Systems (Contributor) / Watts College of Public Service & Community Solut (Contributor) / Barrett, The Honors College (Contributor)
Created2021-05
Description
Scholarly work, industry profile analyses, and sports entertainment, similarly posit the normative fantasy football fan as an uber fan, defined largely by the vast amount of time spent per week consuming sports media content. The average fantasy football participant is also defined as a white, middle-class, married man in his late 20s (FTSA.org). However, by drawing on qualitative interview data of 48 fantasy football participants, we argue that this typical profile of a fantasy football participant as an uber fan is limiting in a masculinist way precisely because it reifies a gendered category of fan as normal, making anything outside of that category deviant. Close analysis of the experiences of thirteen of the 48 fantasy football players, all of whom identify as women, indicate an alternative, cohesive fantasy football participant profile that is centered on being competitive while also being efficient with one's time and resources. Additionally, we find that these women fantasy fans actively reject the notion of the uber fan as the only way to be a normal fantasy football fan because they want to play and win on their own terms.
ContributorsItmam, Arif (Author) / Ingram-Waters, Mary (Thesis director) / Southergill, Keith (Committee member) / Lashley, Mark (Committee member) / School of Molecular Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
Emergency departments (EDs) across the country have been forced to accommodate an ever-expanding population of mental health patients. This study surveyed physicians and social workers in order to determine the most commonly treated mental illnesses in the ED, common frustrations in the care of mental health patients, limitations in the provision of treatment, and possible changes and improvements to the treatment system for the future. Attitudes toward the deinstitutionalization movement of the 1960s also were assessed, as this movement is hypothesized to have contributed to the current strain on EDs with respect to treating mental health issues. In this thesis, the deinstirutionalization movement and possible implications for mental health treatment in EDs are reviewed' In addition, questionnaires were administered to a sample of 6 ED doctors and 2 ED social workers-. Survey responses suggest that more resources, including availability of ED staff psychiatrists and dedicated facilities for mental health patients' would offer improvements to the current system. With careful evaluation of the ability of the ED to meet the needs of mental health patients, alternative resources for more effective and successful treatment strategies may be developed that offer a compromise between institutionalization and the revolving door of the ED.
ContributorsWinikates, Kristina (Author) / Roberts, Nicole (Thesis director) / Maienschein, Jane (Committee member) / Tinsley, Barbara (Committee member) / Barrett, The Honors College (Contributor)
Created2012-05
Description
The objective of the study is to examine the factors of a successful diversity program within four companies that attempt to break down the barriers contributing to the lack of diversity within the design and technical field of theatre. Companies in different regions of the United States (West, Midwest, South, and Northeast) were selected and analyzed for their fellowship, apprenticeship, internship, and educational program in order to see why it is successful and how it contributes to diversifying the design and technical field of theatre. The findings of the study provide a guide to the best practices used in establishing a design and production program that can contribute to diversifying the theatre industry.
ContributorsFox, Neaco (Author) / Winnemann, Christopher (Thesis director) / Ingram-Waters, Mary (Committee member) / School of Film, Dance and Theatre (Contributor) / Dean, W.P. Carey School of Business (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05