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- Genre: Masters Thesis
- Creators: Arizona State University
- Creators: Chakraborty, Bijeta
- Member of: ASU Electronic Theses and Dissertations
Description
The development of literacy abilities in young children has been a major concern for authorities and teachers in the USA for the last two decades. Significant effort has been devoted to ensure that preschool settings allow and motivate children to engage in literacy activities before entering kindergarten. Research has found that a rich classroom environment in preschool settings enables teachers to encourage literacy interest in children at a young age. While a large amount of research has concentrated in testing the effect of prescriptive modifications in the classroom environment, few have focused on studying the design process and tools that teachers follow to design their classrooms. Public policy and research studies in the United States, mention the design of the classroom environment among teacher's responsibilities, but they do not include practical or methodological guides for them to use. The purpose of this research was to study the design process and tools that teachers use to design literacy rich classrooms in preschool settings. A case study was conducted at the ASU Mary Lou Fulton Teachers College Preschool at Arizona State University. This setting provides a unique opportunity for an exploratory study of this nature because it is a private child development laboratory with a flexible curriculum. Participant observation sessions and in depth semi-structured interviews were conducted to explore the design process used and experienced by the teachers. Findings revealed an iterative and cyclic design process that is repeated over time adjusting to the influence of numerous factors. Results also suggest that teacher's knowledge and beliefs highly influence the organization of their classrooms. Considering these factors as a standpoint allows for further exploration to determine a design process suitable for teachers when designing their learning environments. The use of a structured yet flexible design process, can be a potential tool for educators to design their classrooms, collaborate, document and transmit their knowledge. Although the findings correspond to a specific site studied, the implications are wide reaching as problems and opportunities expressed by the staff are common to other educational settings with similar characteristics.
ContributorsCortes, Catalina (Author) / Patel, Mookesh (Thesis advisor) / Heywood, William (Committee member) / Christie, James (Committee member) / Arizona State University (Publisher)
Created2013
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
Guided by Belsky's Determinants of Parenting Process Model, the goal of the present study was to examine how mothers' personality (i.e., Conscientiousness) and behaviors (i.e., sensitivity, structure, and negative control) relate to children's developmental outcomes, such as internalization (i.e., committed compliance and effortful control) and academic adaptation. A multi-method, longitudinal model included five waves of data to examine the processes of the relations among variables. Mothers' Conscientiousness was measured via self-reported data when children were 18 months of age (N = 256), mothers' parenting behaviors were measured through observational laboratory tasks when children were 30 months (N = 230), children's internalization was measured using mothers' and caregivers' reports as well as observational data at 42 months (N = 210), and children's school adaptation was measured when children were 72 and 84 months (Ns = 169 and 144) using mothers' and teachers' reports. Through a series of regression analyses, the results supported the mediated effect of effortful control in the relation between mothers' behaviors and children's school adaptation. As hypothesized, mothers' Conscientiousness marginally predicted children's internalization. Contrary to hypotheses, mothers' Conscientiousness was unrelated to parenting behaviors and children's academic adaptation. Mothers' sensitivity interacted with maternal structure to predict children's effortful control. Socioeconomic status and child sex interacted with mothers' behaviors in predicting the child's committed compliance. The discussion focuses on the unique role of parenting practices and personality on children's internalization and academic adaptation and on the existing literature. Implications of the study for clinicians and intervention researchers are offered.
ContributorsKopystynska, Olena (Author) / Spinrad, Tracy L. (Thesis advisor) / Eisenberg, Nancy (Committee member) / Valiente, Carlos (Committee member) / Arizona State University (Publisher)
Created2014
Description
Early Childhood Education (ECE) classroom quality has been gaining increased attention from researchers and policy makers, as the link between high quality early learning experiences and future success has become clear. The impact of ECE may be particularly important for low-income, ethnic minority youth, who may need additional support to reach the academic level of their higher-income, Caucasian peers. However, the definition of ECE quality does not currently include indicators of classroom practices and center-wide policies that intentionally address issues of culture, race, and ethnicity, topics that may be particularly relevant for the most academically at-risk children. Anti-bias education (ABE) provides a strong theoretical and practical framework for understanding how to incorporate such themes into classroom practice and policy, as well as how to teach students to actively counteract bias and discrimination. However, there is currently no mechanism for researchers to utilize this framework, because there is no measure that can reliably evaluate the level of quality of ABE practices. Therefore, the present study sought to incorporate anti-bias education principles into the conceptualization of classroom quality through measurement development. The measure was developed based on the integration of the original ABE theory with interviews and observations in five ECE programs, which were nominated for their intentional practices regarding issues of culture, race, and ethnicity in the classroom. The five centers ranged in the ethnic composition and average income of their population. The resulting measure contains five domains, with a number of items within each domain. Two of the domains (Toys & Materials, Visual/Aesthetic Environment) contain observational rubrics for assessment, whereas the other three (Organizational Climate, Activities, Interactions) include self-report scales in addition to the rubrics. Future research is needed to pilot the measure and establish validity and reliability across contexts and observation times.
ContributorsGaias, Larissa Michelle (Author) / Dumka, Larry (Thesis advisor) / Shivers, Eva M (Committee member) / Simpkins, Sandra (Committee member) / Arizona State University (Publisher)
Created2015
Description
Preschool teachers have the opportunity to facilitate children's play with a variety of classroom activities. Preschool activities can be categorized as masculine, feminine, and gender-neutral based on children's preferences. Understanding how and why teachers facilitate children's play with feminine, masculine, and gender-neutral activities is important because children's engagement in gender typed activities has been linked to cognitive development. The current study extends previous and outdated research on teachers' engagement in gender-typed classroom activities by using a teacher-focal observational coding system and survey data to assess the frequency at which, with whom, and why teachers facilitate feminine, masculine, and gender-neutral activities. Results reveal teachers facilitate gender-neutral and masculine activities more frequently than feminine activities. However, facilitation of these activities is qualified by with whom the teacher interacts and the classroom context. During free play, teachers facilitate gender-typed activities in stereotypic ways, facilitating masculine activities with boys more than with girls and feminine activities with girls more than with boys. Although, during structured settings, teachers do not facilitate masculine and feminine activities at different frequencies. Finally, in both free play and structured settings, teachers' gender attitudes do not seem to be strong predictors of their facilitation of gender-typed and gender-neutral activities with the exception of teachers' facilitation of feminine activities during structured settings. The present findings address important issues in educational and developmental research by investigating teachers' gendered classroom practices.
ContributorsGranger, Kristen L (Author) / Hanish, Laura (Thesis advisor) / Bradley, Robert (Committee member) / Kornienko, Olga (Committee member) / Arizona State University (Publisher)
Created2014
Description
Researchers who have previously explored the relation of broad-based temperamental approach constructs, such as surgency/extraversion, exuberance, or behavioral approach sensitivity, to academic competence (AC) in early elementary school have often found conflicting results. Moreover, few researchers have examined the interaction between these approach reactivity constructs and effortful control (EC) in the prediction of AC. The goal of the current study was to examine the fine-tuned relations of different aspects of temperamental approach reactivity in early childhood (42 and 54 months; N=223), such as impulsivity, frustration, and positive affect, as well as EC, to AC during early elementary school (72 and 84 months). Examining the complex relations may clarify the literature using broad-based approach reactivity constructs. Temperament was observed in the laboratory when children were 54 months of age. Mothers and caregivers also reported on children's impulsivity at 42 and 54 months. School-related behavioral adjustment was reported by children, mothers, and teachers, and GPA was reported by teachers at 72 and 84 months. The results of the study indicated that positive affect, EC, and receptive language ability were the only unique direct predictors of school adjustment and/or GPA. Without EC in the model, only positive affect and vocabulary predicted AC. Frustration, positive affect, and impulsivity each interacted with EC to predict AC outcomes, such EC was only related to higher AC for children with high impulsivity or anger, or low positive affect. Additionally, positive affect and impulsivity interacted to predict GPA, such that impulsivity was positively related to GPA for children with high positive affect, but it was negatively, albeit nonsignificantly, associated with GPA for children with low positive affect. These results were found to be similar for boys and girls. Finding are discussed in terms of the developmental importance of early EC for academic competence for children who have high approach reactivity, as well as the interactive effects of dimensions of approach reactivity on academic achievement.
ContributorsVanSchyndel, Sarah (Author) / Eisenberg, Nancy (Thesis advisor) / Spinrad, Tracy L. (Committee member) / Valiente, Carlos (Committee member) / Arizona State University (Publisher)
Created2014
Description
Early childhood is a special and amazing period in a child's development. It is a period during which all facets of a human being-cognitive, linguistic, physical, emotional, social, and spiritual--are rapidly developing and influenced by a child's interactions with her socializers and environment. Fundamentally, what happens during this critical period will influence and impact a child's future learning. Much of what is known about children's development comes from research focusing primarily on mainstream English speaking children. However, not much that is known about Indigenous children and their early period of child development. Therefore, this thesis research focused on Diné children and their early childhood experiences that occur during the fundamental time period before Diné children enter preschool. It also examines the contemporary challenges that Diné parents and other cultural caretakers face in ensuring that Diné infants and young children are taught those important core elements that make them uniquely Diné. The research questions that guide this thesis are: 1.What do Diné people believe about children and their abilities? 2.What do Diné children need to learn in order to become Diné? 3. What are the Diné childhood rearing beliefs and practices? 4. Why aren't Diné parents and grandparents teaching their children how to be Diné? Findings reveal an early childhood experience in which children are viewed as true explorers and highly intelligent, inquisitive learners and included as integral participants and contributors to the family and community. This thesis concludes with a discussion of the multidimensional transitions, such as the shift from the Diné language to English in Diné homes and communities that have occurred in the Diné way of life and how they have impacted how Diné children are socialized. Creative alternatives for increasing Diné childhood speakers on and off the Navajo reservation are also considered.
ContributorsBia, Sunshine Sallie (Author) / Romero-Little, Mary E (Thesis advisor) / Tippeconnic, John (Thesis advisor) / Martinez, David (Committee member) / Arizona State University (Publisher)
Created2011
Description
Via my personal, academic and professional journey, I closely examine my career growth and how my perspectives on early childhood environments developed in reference to free play. Using a narrative format, I share personal experiences that have shaped my views on free play. Free play is a type of play that features choices, freedom of selection, cognitive and social development, and child interest. I review relevant literature and weave in my personal and professional experiences in order to reflect on free play from two different perspectives: participant (child), and the Early Childhood Professional (teacher and/or administrator). I also demonstrate how my professional and academic milestones have contributed to my developing beliefs and ideas put into practice about free play in early childhood environments.
ContributorsAlleyne, Teja Diamond (Author) / Swadener, Beth Elizabeth (Thesis advisor) / Nagasawa, Mark (Committee member) / Bartlett, Margaret (Committee member) / Arizona State University (Publisher)
Created2011
Description
This study investigated the efficacy of Early Head Start home-based, center-based and mixed-approach programs on cognitive, language and behavioral outcomes at different levels of cumulative environmental risk. Early Head Start is a federal program that provides low-income families and their children from birth to age three with childcare, parenting education, healthcare and other family supports. As part of Early Head Start's initiation, a program evaluation was begun involving 3,001 children from 17 programs around the country. Half of the children were randomly assigned to the control group, who received no Early Head Start services. Data were collected through program application and enrollment forms, interviews of parents and child and family assessments. Almost all of the children's primary caretakers were mothers, ranging in age from 18 to 26. One-third were African American, one-third white, and one-fourth Hispanic. Almost half of the parents did not have a high school diploma at the time of enrollment, and most of the families received public support of some kind. For each child, a multiple environmental risk score was calculated, which was the sum of 10 possible environmental risks. Each of four outcomes was regressed onto the ten risks individually and also as a cumulative risk index along with program type and covariates. There were significant negative relations of accumulated risk to reductions in reasoning, spatial ability and vocabulary and increased behavior problems. Children with at least eight risks scored 1.48 standard deviations lower on reasoning ability and vocabulary, .48 standard deviations lower on spatial ability and .48 standard deviations higher on behavior problems. The home-based program showed significant benefit for reasoning and vocabulary. Versus the control group, home-based programs increased average reasoning scores by .24 of a standard deviation and increased vocabulary by .14 of a standard deviation. There was no significant difference in program benefits at different levels of risk. This suggests that for reasoning and vocabulary, the home-based program is promotive because the degree of benefit Early Head Start appears to provide is consistent across all levels of risk for the set of risks and outcomes examined in this study.
ContributorsBudinger, Susan (Author) / Bradley, Robert H (Thesis advisor) / Doane Sampey, Leah D (Committee member) / Valiente, Carlos (Committee member) / Arizona State University (Publisher)
Created2012
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