Matching Items (166)
Description
Legislative changes and discussions about the United States falling further and further behind other nations in science, technology, engineering, and math (STEM) achievement are growing. As they grow, STEM instruction in elementary school has earned its place as a national area of interest in education. In the case of Ivory School District, teachers are being asked to radically change their daily practices by consistently implementing inquiry-based STEM experiences in their classrooms. As such, teachers are being asked to scale a divide between the district expectations and their knowledge and experience. Many fourth grade educators are teachers who have been trained as generalists and typically do not have specific background or experience in the philosophy, instructional strategies, or content associated with STEM. Using a prototype approach, this study aims to understand how such teachers conceptualize STEM instruction and the relationship between their experience and conceptions.
ContributorsKenney, Meghan (Author) / Fischman, Gustavo (Thesis advisor) / Powers, Jeanne (Committee member) / Rasch, Katherine D (Committee member) / Arizona State University (Publisher)
Created2013
Description
Examining the elements of the hidden curriculum in theatre education allows theatre educators the opportunity to reflect on their own pedagogy and its effects on the learner. The hidden curriculum refers to the unspoken or implicit values, norms, and beliefs that are transmitted through tacit messages. When the hidden curriculum remains veiled, the impact on the learner's education and socialization process can perpetuate gender, race, and class inequalities. In order to understand how the hidden curriculum manifests itself in theatre classrooms, we have to look at schools as "agents of legitimation, organized to produce and reproduce the dominant categories, values, and social relationships necessary for the maintenance of the larger society" (Giroux, 1983, p. 72). This qualitative study examined the hidden curriculum in theatre at the secondary level and looked at theatre teachers' pedagogy in reproducing elements of the hidden curriculum. Interviews, naturalistic observation, and a researcher reflective journal were employed in the data collection process to better understand: a) the elements of hidden curriculum that appear in theatre education at the secondary level, b) how the pedagogical practices of theatre teachers support societal structures, and c) how the hidden curriculum in theatre reinforces gender, race, and social class distinctions. Data were then coded and analyzed to find emergent themes. Multiple theoretical perspectives serve as a conceptual framework for understanding the hidden curriculum, and provide a neglected perspective of the hidden curriculum in theatre education. The theatre classroom provides a unique space to view hidden curriculum and can be viewed as a unique agent of social change. Themes related to the first research question emerged as: a) privileges for older students, b) school rules, c) respect for authority, d) acceptance of repetitive tasks, and c) punctuality. Themes related to the second research question emerged as: a) practices, b) procedures, c) rules, d) relationships, and e) structures. Finally, themes related to the third question emerged as: a) reinforcement of social inequality, b) perpetuation of class structure, and c) acceptance of social destiny. The discussion looks at the functions of theatre pedagogy in the reproduction of class, inequality, and institutionalized cultural norms.
ContributorsHines, Angela R (Author) / Saldana, Johnny (Thesis advisor) / Malewski, Erik (Committee member) / Fischman, Gustavo (Committee member) / Arizona State University (Publisher)
Created2013
Description
The applications which use MEMS accelerometer have been on rise and many new fields which are using the MEMS devices have been on rise. The industry is trying to reduce the cost of production of these MEMS devices. These devices are manufactured using micromachining and the interface circuitry is manufactured using CMOS and the final product is integrated on to a single chip. Amount spent on testing of the MEMS devices make up a considerable share of the total final cost of the device. In order to save the cost and time spent on testing, researchers have been trying to develop different methodologies. At present, MEMS devices are tested using mechanical stimuli to measure the device parameters and for calibration the device. This testing is necessary since the MEMS process is not a very well controlled process unlike CMOS. This is done using an ATE and the cost of using ATE (automatic testing equipment) contribute to 30-40% of the devices final cost. This thesis proposes an architecture which can use an Electrical Signal to stimulate the MEMS device and use the data from the MEMS response in approximating the calibration coefficients efficiently. As a proof of concept, we have designed a BIST (Built-in self-test) circuit for MEMS accelerometer. The BIST has an electrical stimulus generator, Capacitance-to-voltage converter, ∑ ∆ ADC. This thesis explains in detail the design of the Electrical stimulus generator. We have also designed a technique to correlate the parameters obtained from electrical stimuli to those obtained by mechanical stimuli. This method is cost effective since the additional circuitry needed to implement BIST is less since the technique utilizes most of the existing standard readout circuitry already present.
ContributorsJangala Naga, Naveen Sai (Author) / Ozev, Sule (Thesis advisor) / Bakkaloglu, Bertan (Committee member) / Kiaei, Sayfe (Committee member) / Arizona State University (Publisher)
Created2014
Description
In thesis, a test time reduction (a low cost test) methodology for digitally-calibrated pipeline analog-to-digital converters (ADCs) is presented. A long calibration time is required in the final test to validate performance of these designs. To reduce total test time, optimized calibration technique and calibrated effective number of bits (ENOB) prediction from calibration coefficient will be presented. With the prediction technique, failed devices can be identified only without actual calibration. This technique reduces significant amount of time for the total test time.
ContributorsKim, Kibeom (Author) / Ozev, Sule (Thesis advisor) / Kitchen, Jennifer (Committee member) / Barnaby, Hugh (Committee member) / Arizona State University (Publisher)
Created2013
Description
Mobile electronic devices such as smart phones, netbooks and tablets have seen increasing demand in recent years, and so has the need for efficient, responsive and small power management solutions that are integrated into these devices. Every thing from the battery life to the screen brightness to how warm the device gets depends on the power management solution integrated within the device. Much of the future success of these mobile devices will depend on innovative, reliable and efficient power solutions. Perhaps this is one of the drivers behind the intense research activity seen in the power management field in recent years. The demand for higher accuracy regulation and fast response in switching converters has led to the exploration of digital control techniques as a way to implement more advanced control architectures. In this thesis, a novel digitally controlled step-down (buck) switching converter architecture that makes use of switched capacitors to improve the transient response is presented. Using the proposed architecture, the transient response is improved by a factor of two or more in comparison to the theoretical limits that can be achieved with a basic step down converter control architecture. The architecture presented in this thesis is not limited to digitally controlled topologies but rather can also be used in analog topologies as well. Design and simulation results of a 1.8V, 15W, 1MHz digitally controlled step down converter with a 12mV Analog to Digital Converter (ADC) resolution and a 2ns DPWM (Digital Pulse Width Modulator) resolution are presented.
ContributorsHashim, Ahmed (Author) / Bakkaloglu, Bertan (Thesis advisor) / Kiaei, Sayfe (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2013
Description
This study focuses on implementing probabilistic nature of material properties (Kevlar® 49) to the existing deterministic finite element analysis (FEA) of fabric based engine containment system through Monte Carlo simulations (MCS) and implementation of probabilistic analysis in engineering designs through Reliability Based Design Optimization (RBDO). First, the emphasis is on experimental data analysis focusing on probabilistic distribution models which characterize the randomness associated with the experimental data. The material properties of Kevlar® 49 are modeled using experimental data analysis and implemented along with an existing spiral modeling scheme (SMS) and user defined constitutive model (UMAT) for fabric based engine containment simulations in LS-DYNA. MCS of the model are performed to observe the failure pattern and exit velocities of the models. Then the solutions are compared with NASA experimental tests and deterministic results. MCS with probabilistic material data give a good prospective on results rather than a single deterministic simulation results. The next part of research is to implement the probabilistic material properties in engineering designs. The main aim of structural design is to obtain optimal solutions. In any case, in a deterministic optimization problem even though the structures are cost effective, it becomes highly unreliable if the uncertainty that may be associated with the system (material properties, loading etc.) is not represented or considered in the solution process. Reliable and optimal solution can be obtained by performing reliability optimization along with the deterministic optimization, which is RBDO. In RBDO problem formulation, in addition to structural performance constraints, reliability constraints are also considered. This part of research starts with introduction to reliability analysis such as first order reliability analysis, second order reliability analysis followed by simulation technique that are performed to obtain probability of failure and reliability of structures. Next, decoupled RBDO procedure is proposed with a new reliability analysis formulation with sensitivity analysis, which is performed to remove the highly reliable constraints in the RBDO, thereby reducing the computational time and function evaluations. Followed by implementation of the reliability analysis concepts and RBDO in finite element 2D truss problems and a planar beam problem are presented and discussed.
ContributorsDeivanayagam, Arumugam (Author) / Rajan, Subramaniam D. (Thesis advisor) / Mobasher, Barzin (Committee member) / Neithalath, Narayanan (Committee member) / Arizona State University (Publisher)
Created2012
Description
Power management plays a very important role in the current electronics industry. Battery powered and handheld applications require novel power management techniques to extend the battery life. Most systems have multiple voltage regulators to provide power sources to the different circuit blocks and/or sub-systems. Some of these voltage regulators are low dropout regulators (LDOs) which typically require output capacitors in the range of 1's to 10's of µF. The necessity of output capacitors occupies valuable board space and can add additional integrated circuit (IC) pin count. A high IC pin count can restrict LDOs for system-on-chip (SoC) solutions. The presented research gives the user an option with regard to the external capacitor; the output capacitor can range from 0 - 1µF for a stable response. In general, the larger the output capacitor, the better the transient response. Because the output capacitor requirement is such a wide range, the LDO presented here is ideal for any application, whether it be for a SoC solution or stand-alone LDO that desires a filtering capacitor for optimal transient performance. The LDO architecture and compensation scheme provide a stable output response from 1mA to 200mA with output capacitors in the range of 0 - 1µF. A 2.5V, 200mA any-cap LDO was fabricated in a proprietary 1.5µm BiCMOS process, consuming 200µA of ground pin current (at 1mA load) with a dropout voltage of 250mV. Experimental results show that the proposed any-cap LDO exceeds transient performance and output capacitor requirements compared to previously published work. The architecture also has excellent line and load regulation and less sensitive to process variation. Therefore, the presented any-cap LDO is ideal for any application with a maximum supply rail of 5V.
ContributorsTopp, Matthew (Author) / Bakkaloglu, Bertan (Thesis advisor) / Thornton, Trevor (Committee member) / Ozev, Sule (Committee member) / Arizona State University (Publisher)
Created2012
Description
Universities have been increasingly engaged in international collaborations with peer institutions overseas. In recent years, Confucius Institutes have emerged as a new model of collaboration between American universities and Chinese universities. In an attempt to identify factors contributing to successful international university collaborations, this study used the case study method and focused on one Confucius Institute between MMU, an American University, and ZZU, a Chinese university, and intended to identify factors leading to the success of the MMU-ZZU Confucius Institute collaboration. The study investigated the MMU-ZZU Confucius Institute collaboration within the framework of the MMU-ZZU institutional partnership. Based on data collected from the institutional documents, interviews, site visits and news reports, this study examined the experiences and perceptions of the university's stakeholders involved in creating and sustaining this particular Confucius Institute, including stakeholders at the program level, at the college level, and at the institutional level both at MMU and ZZU. Using the glonacal agency heuristics framework, the MMU-ZZU Confucius Institute collaboration was a result of joint forces of stakeholders at the program level, at the college level, and at the institutional level from ZZU and MMU. Stakeholders, no matter what level they are and which institution they are affiliated with, had to navigate through the significant differences between them to develop synergy to be successful. Synergy, including vertical synergy developed among stakeholders within each institution and horizontal synergy developed among stakeholders between institutions, turned out to be critical to the success of the MMU-ZZU CI. The study concluded that synergy in leadership, organizational contexts, stakeholders' resources, and the synergy in the MMU-ZZU Confucius Institute collaboration and the MMU-ZZU institutional partnership, led to the success of the MMU-ZZU Confucius Institute collaboration.
ContributorsLi, Mengying (Author) / De Los Santos Jr., Alfredo G (Thesis advisor) / Wiley, Terrence (Thesis advisor) / Fischman, Gustavo (Committee member) / Arizona State University (Publisher)
Created2012
Description
The presence of language minority students in American schools is a growing phenomenon in present-day times. In the year 2008, almost 11 million school-age children spoke a language other than English at home. Educational language policy is largely influenced by the attitudes that society holds regarding the presence of language minority speakers in the community. One of the sources of these attitudes is the written press. This research aimed at identifying and analyzing the ideologies that newspapers display in connection with language minority speakers. The underlying assumption of the study was that the English language occupies a dominant position in society, thus creating a power struggle in which speakers of other languages are disenfranchised. Using critical theory as the theoretical framework enabled the study to identify and oppose the ideologies that may reproduce and perpetuate social inequalities. The methodological approach used was critical discourse analysis (CDA) which aligns with the main tenets of critical theory, among them the need to uncover hidden ideologies. The analysis of articles from English-language (The Arizona Republic and the East Valley Tribune) and Spanish-language (La Prensa Hispana) newspapers allowed for the identification of the ideologies of the written press in connection to two main hypothetical constructs: education and immigration. The analysis of the results revealed that the three newspapers of the study held specific ideologies on issues related to the education of language minority students and immigration. Whereas the East Valley Tribune showed an overarching ideology connected to the opposition of immigrant students in schools, the hegemonic position of theEnglish language, and a belligerent stance toward the immigrant community, The Arizona Republic showed a favorable attitude to both English Language Learners and immigrants, based on reasons mainly related to the economic interest of the state of Arizona. La Prensa Hispana, on the other hand, showed ideologies favorable to the immigrant community based on humanitarianism. In summary, the results confirm that newspapers hold specific ideologies and that these ideologies are reflected in the content and the manner of their information to the public.
ContributorsGonzález-Carriedo, Ricardo (Author) / Ovando, Carlos (Thesis advisor) / Wiley, Terrence (Thesis advisor) / Fischman, Gustavo (Committee member) / Mccarty, Teresa (Committee member) / Arizona State University (Publisher)
Created2012
Description
ABSTRACT High numbers of dropouts can be found throughout the country, but research has shown the problem to be most prevalent in minority communities. Although the majority of dropouts were Anglo, the highest event dropout rates were found among American Indians, Hispanics and African Americans. This descriptive study investigated how students negotiate school structure, social supports, and cultural identity to gain an insider or "emic" perspective on youth decision-making regarding whether to drop out or remain in school. Research was conducted in a suburban school district with a high school population of over 10,000 students in grades 9 through 12. Student selection was based on criteria developed through an analysis of district data of students that had dropped out of school over a three-year period from the 2006-2007 to 2008-2009 school years. In-depth semi-structured interviews were conducted with seven participants of high school age. These participants were placed in one of three sample groups that fit the dropout profile. These groups were (1) students currently attending high school, (2) students who dropped out prior to completing graduation requirements, and (3) students who had graduated. The findings in this study will benefit the educational community as it relates to K-12 education and students leaving school (dropping out). Educators and administrators will be able to evaluate the findings of the study to review current practices and policies within their organization. The data will also give administrators the opportunity to develop and implement programs that can assist students in staying in school.
ContributorsGilbert, Craig (Author) / Kozleski, Elizabeth B. (Thesis advisor) / Fischman, Gustavo (Committee member) / Deprez, Suzie (Committee member) / Arizona State University (Publisher)
Created2012