VictorJuiz/thesis huggingface dataset:
Perspectives on Quality in Minority Education in China: The Case of Sunan Yughur Autonomous County, Gansu
Keywords: minority education China
stakeholders perspectives students parents teachers administrators
bilingual education
school-based curriculum
endangered language
language revitalization
Yughur language
Yughur nationality
quality education

This exploratory multiple embedded case study investigates perspectives on education reform under conditions of minority language endangerment in Sunan Yughur Autonomous County, a minority-district in northwest China. The study included three school sites: a Yughur minority urban school; a Yughur minority rural district school, and a Yughur majority rural district school and four embedded cases: school administrators, teachers, parents and students, of Yughur, other minority, or Han nationality. Adult stakeholders were interviewed on what is important to learn in “education for quality”, and what aspects of Yughur knowledge, culture and language should be included in school curriculum as part of education for quality, while students were asked what they enjoyed studying and whether they would enjoy learning stories, poems and songs in Yughur in school. Findings include strong support among parents and students regardless of ethnicity or school site for Yughur language and culture as “essential qualities” to foster in Sunan County school curriculum, with moderate to weak support among educators ranges with some variation among sites. Three parallel visions emerge from the study of what it means today for Chinese minority student to be an educated person in contemporary China: (a) regular Chinese-medium education; (b) multicultural Chinese-medium education; and (c) maintenance bilingual education in Yughur and Chinese. The third vision envisions developing additive bilinguals who know the heritage of their minority as well as the national curriculum in Mandarin. A vision of balanced bilingualism and multiculturalism that sees heritage languages and Mandarin as “resources” is shared by the large majority of parents and students, most teachers and some administrators. Holders of other visions for local minority education largely share a “Language as Problem” orientation towards minority languages. One aim of devolution of school-based curriculum authority is to develop schools’ individuality. This study reveals three divergent models of local schooling that have developed in one minority school district: one that centres on a monolingual model of national culture, one monolingual, multicultural model, and one bilingual, multicultural model, with the latter model corresponding more closely to minority stakeholder perspectives that schools should play a stronger role in the maintenance and revitalization of their cultural and linguistic heritage.
An Examination of Academic Department Chairs in Canadian Universities
Keywords: administration
department chair
university
department chair

This thesis is a baseline, population study, designed to create historical and contemporary contexts for and to inform current understanding of the department chair function in Canadian universities. Chairs are explored from five discrete yet dependent perspectives to discern distinctions and associations among institutions, disciplines/fields of study and individuals: What is the job? Who holds the job? Does formal position prescription match practice? Has the job changed over time? What makes department chairs job ready and effective? Canvassing 43 predominantly English-language public universities in 10 provinces, the inquiry encompasses four data sources: (1) 58 university policy documents and faculty association collective agreements; (2) a national electronic survey in two versions – for incumbent chairs, which generated replies from 511 email recipients, representing 38 per cent of the 1,333 individuals in the population approached; and for incumbent deans, sought for their views of the chair function, which drew the participation of 79 email recipients of 269 prospective contributors, signifying a 29 per cent response rate; (3) telephone interviews with 30 chairs and 15 deans (active, former and retired); and (4) curricula vitae of 134 chairs and deans (active, former and retired). The findings confirm the longstanding tradition of the job’s temporary nature, irrespective of institution and discipline. Candidates are usually drawn from tenured faculty ranks, primarily from the immediate unit. The notion of non-academic professionals from outside the university setting occupying the role is viewed by chairs and deans with disdain and is not evident in practice, either in hard pure and applied fields of study such as science, engineering and medicine, or in the soft pure and applied areas such as arts, business and education. The notion of a business-oriented approach to departmental administration appears to be largely a function of an institution’s size and its culture shaped by senior management rather than its location, age and type or a specific discipline with the exception of medicine and engineering. Chairs remain members of the collective bargaining unit in unionized faculty associations during their term of office and typically deem their ability to lead professorial peers with authority constrained as an equal.
Food, Eating and the Body: An Account of Women's Lived Experiences Across the Lifespan
Keywords: hunger, appetite
eating experiences

The purpose of this study was to explore women’s subjective food and eating experiences from childhood through to adulthood and the ways in which these experiences either connected or disconnected them from their appetites for food and eating. The present study used a qualitative life history methodology, the goal of which is to assess individuals’ lived experiences to construct broader contextual meaning. In-depth interviews were used to investigate food and eating experiences among twelve women between ages 25 and 44, representing diverse social and cultural backgrounds as well as current and past eating problems. Participants took part in an open-ended interview, using a series of guided questions about their food and eating experiences from childhood through to adulthood. The interviews were transcribed and analyzed for themes using the constant comparison method. Two models emerged from the data in this study that described the social factors that connected and disconnected women from their appetites and eating. The Regulating Discourses Model which outlines current ways women negotiate appetite and desire through food and eating experiences, and the Socialization through Food and Eating Model which delineates socialization processes related to food and eating during women’s development. This research may be useful for counselors, health care professionals, as well as the larger community to increase awareness on ways to maintain girls’ and women’s connection to their bodily appetites and desires throughout the lifespan.
Functional Analysis of the Thiol Oxidoreductase ERp57 and its Role in the Biogenesis of MHC Class I Molecules
Keywords: protein folding
thiol oxidoreductase
ERp57
major histocompatibility complex
antigen presentation

Class I major histocompatibility complex molecules present antigenic peptides to cytotoxic T lymphocytes, which leads to the elimination of virus infected cells. Class I molecules are heterotrimers consisting of a heavy chain, a light chain termed beta2-microglobulin, and a peptide ligand. Assembly of class I molecules begins in the endoplasmic reticulum where the heavy chain associates with beta2-microglobulin, and the heavy chain-beta2-microglobulin heterodimers enter a peptide loading complex where class I molecules acquire peptides. During the biogenesis of class I molecules, ERp57, a thiol oxidoreductase, associates with free class I heavy chains and, at a later stage, with the peptide loading complex. In this thesis, I show for the first time that ERp57 participates in oxidative folding of the heavy chain. Depletion of ERp57 by RNAi delayed heavy chain disulfide bond formation and slowed folding of the heavy chain alpha3 domain. Interestingly, depletion of another thiol oxidoreductase, ERp72, had no such effect. Since ERp57 associates with the lectin-chaperones calnexin and calreticulin, it is thought that ERp57 requires these chaperones to gain access to its substrates. To test this idea, I examined class I biogenesis in cells lacking calnexin or calreticulin or that express an ERp57 mutant that fails to bind to these chaperones. Remarkably, heavy chain disulfides formed at the same rate in these cells as in wild type cells, suggesting that ERp57 has the capacity to recognize its substrates directly in addition to being recruited through lectin-chaperones. ERp57 also forms a mixed disulfide with tapasin within the peptide loading complex and I found that the formation of this mixed disulfide is independent of its interaction with calnexin and calreticulin. I also found that calreticulin could be recruited into the peptide loading complex in the absence of interactions with both ERp57 and substrate oligosaccharides, demonstrating the importance of its polypeptide-binding site in substrate recognition. Finally, by inactivating the redox active sites of ERp57, I demonstrate that its enzymatic activity is dispensable in stabilizing the loading complex and in supporting efficient peptide loading. Thus, ERp57 plays a structural rather than catalytic role within the peptide loading complex.
Numerical Modeling of Active Hydraulic Devices and Their Significance for System Performance and Transient Protection
Keywords: Active Hydraulic Device
Hydro Turbine
Non-Reflective Boundary
Transient

The thesis numerically explores the use and behavior of Active Hydraulic Devices (AHDs), creating a new capability to simulate and control a pipe system’s transient performance. Automatic control valves are the first type of AHDs studied in this research. Due to the challenges inherent in the design of a pressure relief valve (PRV), the general principles of PRV use and selection are studied along with the system’s response to the PRV parameters. A new application of PID (proportional, integral and derivative) control valve is envisioned that combines a remote sensor at the upstream end of a pipeline to create a non- or semi- reflective boundary at the downstream end. Case studies show that, with such a boundary, the reflection and resonance of pressure waves within the pipeline are sometimes eliminated and invariably limited. The second type of AHDs studied in this research is the governed hydro turbine, the most complicated hydraulic component in terms of transient analysis and waterhammer control. A complete numerical model is developed for the turbine installations in either urban water networks or conventional hydropower generation systems. Using the model, transient simulations for several realistic hydro projects are presented along with various transient control measures.
Unemployment Insurance Eligibility and the Dynamics of the Labor Market
Keywords: Unemployment Insurance Eligibility, Dynamics, Labor Market, Equilibrium Unemployment, Moral Hazard

This thesis examines a number of issues regarding the Mortensen-Pissarides search and matching model’s empirical performance. Chapter 1 documents the volatility puzzle with the Canadian data. The combined data from both Canada and the United States present an additional difficulty. Even if the unobserved value of leisure is allowed to be as high as required to fit the business cycle in the United States or in Canada, the model cannot reconcile the similar labor cycles with the large policy differences in the UI benefits and income taxes in the two countries when the value of leisure is assumed to be the same in both countries. Chapter 2 takes into account the realistic institutional features of the UI system and investigates the impacts of the UI benefits on the labor market outcomes. If entitlement to UI benefits must be earned with employment, generous UI is an additional benefit to an employment relationship, so it promotes job creation. If individuals are risk neutral, UI is fairly priced, and the UI system prevents moral-hazard unemployed workers, the generosity of UI has no effect on unemployment. Chapter 3 shows that the Mortensen-Pissarides search and matching model can be successfully parameterized to generate observed large cyclical fluctuations in unemployment and modest responses of unemployment to changes in the UI benefits. The key features behind this success are the endogenous eligibility for UI benefits and the heterogeneity of workers. With the linear utilities commonly assumed in the Mortensen-Pissarides model, a fully rated UI system designed to prevent moral hazard has no effect on unemployment. However, the UI system in the United States is neither fully rated nor able to prevent workers with low productivity from quitting their jobs or rejecting employment offers to collect benefits. As a result, an increase in UI generosity has a positive, but realistically small, effect on unemployment. This chapter answers the Costain and Reiter (2008) criticism with the Mortensen-Pissarides model.
Bioelectric Source Localization in Peripheral Nerves
Keywords: Neural interfaces
Source localization
Peripheral nerves
Nerve cuff electrodes
Neuroprostheses

Currently there does not exist a type of peripheral nerve interface that adequately combines spatial selectivity, spatial coverage and low invasiveness. In order to address this lack, we investigated the application of bioelectric source localization algorithms, adapted from electroencephalography/magnetoencephalography, to recordings from a 56-contact “matrix” nerve cuff electrode. If successful, this strategy would enable us to improve current neuroprostheses and conduct more detailed investigations of neural control systems. Using forward field similarities, we first developed a method to reduce the number of unnecessary variables in the inverse problem, and in doing so obtained an upper bound on the spatial resolution. Next, a simulation study of the peripheral nerve source localization problem revealed that the method is unlikely to work unless noise is very low and a very accurate model of the nerve is available. Under more realistic conditions, the method had localization errors in the 140 μm-180 μm range, high numbers of spurious pathways, and low resolution. On the other hand, the simulations also showed that imposing physiologically meaningful constraints on the solution can reduce the number of spurious pathways. Both the influence of the constraints and the importance of the model accuracy were validated experimentally using recordings from rat sciatic nerves. Unfortunately, neither idealized models nor models based on nerve sample cross-sections were sufficiently accurate to allow reliable identification of the branches stimulated during the experiments. To overcome this problem, an experimental leadfield was constructed using training data, thereby eliminating the dependence on anatomical models. This new strategy was successful in identifying single-branch cases, but not multi-branches ones. Lastly, an examination of the information contained in the matrix cuff recordings was performed in comparison to a single-ring configuration of contacts. The matrix cuff was able to achieve better fascicle discrimination due to its ability to select among the most informative locations around the nerve. These findings suggest that nerve cuff-based neuroprosthetic applications would benefit from implanting devices with a large number of contacts, then performing a contact selection procedure. Conditions that must be met before source localization approaches can be applied in practice to peripheral nerves were also discussed.
FPGA-based Soft Vector Processors
Keywords: soft processor
soft Vector processor
FPGA
custom
embedded
SIMD
data parallel

FPGAs are increasingly used to implement embedded digital systems because of their low time-to-market and low costs compared to integrated circuit design, as well as their superior performance and area over a general purpose microprocessor. However, the hardware design necessary to achieve this superior performance and area is very difficult to perform causing long design times and preventing wide-spread adoption of FPGA technology. The amount of hardware design can be reduced by employing a microprocessor for less-critical computation in the system. Often this microprocessor is implemented using the FPGA reprogrammable fabric as a soft processor which can preserve the benefits of a single-chip FPGA solution without specializing the device with dedicated hard processors. Current soft processors have simple architectures that provide performance adequate for only the least-critical computations. Our goal is to improve soft processors by scaling their performance and expanding their suitability to more critical computation. To this end we focus on the data parallelism found in many embedded applications and propose that soft processors be augmented with vector extensions to exploit this parallelism. We support this proposal through experimentation with a parameterized soft vector processor called VESPA (Vector Extended Soft Processor Architecture) which is designed, implemented, and evaluated on real FPGA hardware. The scalability of VESPA combined with several other architectural parameters can be used to finely span a large design space and derive a custom architecture for exactly matching the needs of an application. Such customization is a key advantage for soft processors since their architectures can be easily reconfigured by the end-user. Specifically, customizations can be made to the pipeline, functional units, and memory system within VESPA. In addition, general purpose overheads can be automatically eliminated from VESPA. Comparing VESPA to manual hardware design, we observe a 13x speed advantage for hardware over our fastest VESPA, though this is significantly less than the 500x speed advantage over scalar soft processors. The performance-per-area of VESPA is also observed to be significantly higher than a scalar soft processor suggesting that the addition of vector extensions makes more efficient use of silicon area for data parallel workloads.
Characterization of the tmRNA Tagging System in Streptomyces coelicolor
Keywords: tmRNA
Streptomyces
translation
antibiotics

The ssrA gene encoded tmRNA acts as both a tRNA carrying an Ala to enter the A site of stalled ribosomes and as an mRNA allowing trans-translation to continue until ribosomes reach the stop codon of the tmRNA tag to help release the stalled ribosome, label the truncated peptide for degradation, and also facilitate degradation of the ribosome-stalling mRNAs. Functions of tmRNA rely on its binding to an essential protein factor SmpB that is encoded by the smpB gene. The mycelial bacteria streptomycetes have a well-defined growth and developmental cycle culminating at sporulation and provide a good model to study tmRNA function in bacteria growth and development. During different developmental stages, expression of some critical molecules are increased or decreased to control the developing procedures including a bldA-encoded tRNA that decodes the rare codon UUA. Translation elongation of genes containing UUA rare codons may be stalled and elicits tmRNA tagging, suggesting that tmRNA the tagging system may be important for Streptomyces growth and development. We use the most well studied strain, S. coelicolor whose genome sequence was the first sequenced, as our model organism. Here I report my ssrA knockout study with two different strategies. Using a temperature sensitive replicon, I found that the ssrA gene could be disrupted only in cells with an extra ssrA gene but not in wild type cells or cells with an extra-copy of tmRNA variant--tmRNADD that encodes a degradation-resistant tag. These results imply that ssrA is an essential gene and that degradation of truncated proteins is also an essential function for S. coelicolor. On the contrary, with the second method that does not need high temperature screening steps I was able to disrupt both the ssrA and smpB genes separately and at the same time, suggesting that the tmRNA tagging system may be required for cell survival under high temperature. Further characterization of mutant cells revealed that the tmRNA tagging system is important for cell growth and development at both high temperature and optimal growth conditions as well as under stress conditions that affect the translation elongation process. The second part of my thesis documents analyses of the expression, regulation and stability of S. coelicolor tmRNA. My results suggested that the well known metabolic stability of bacterial tmRNA might be due to its tight binding to the ribosome. Finally, I report my investigation of the tagging activity and the importance of some structural elements of S. coelicolor tmRNA. Particularly, I demonstrated that pseudoknot 4 is important for tmRNA tagging activity and mutations to some structural elements lead to a decrease of not only the mutant tmRNA but also the wild type tmRNA when expressed together in vivo.
Starting and Staying on Course: Influences of Pre-service and Initial Placement on Beginning Teachers
Keywords: Teacher Training

In this thesis I consider experiences of two beginning teachers during their pre-service year at the Faculty of Education at the University of Toronto and the early years of their teaching careers as they move from student teacher to professional teacher. In particular, I use narratives I created about each woman along with my own to identify the factors which influenced the success of this transition such as the nature of the first teaching positions held, the types of supports and assistance experienced during this transitional phase, and the personal experiences brought to the enterprise of becoming a teacher. Additionally, I look for any changes in their beliefs about teaching from those held as teacher-candidates to those that evolved during the initial years in the classroom and what influence, if any, these professional environments had on such shifts in thinking. In this study I use a narrative inquiry approach in which my own story is placed along side those of my two participants. By doing so, I acknowledge the close relationship between the primary investigator and the study subjects that is inherent in this qualitative method. My data sources for the narratives I created include written material in the form of journals, interview transcripts, practice teaching reports, and personal narratives produced by and about my participants during the time under study. In my concluding chapter, I make suggestions for changes both to the ways in which teacher-candidates are instructed as they begin to learn the intricacies of the art of teaching and to the conditions under which many of these new members of the profession begin their careers. There are many avenues for future research that I did not pursue in this study and some of these are outlined in my conclusions.