Dissertations / Theses on the topic 'Active learner'

Goal optimization has long been a topic of great interest in computer science. The literature contains many thousands of papers that discuss methods for the search of optimal solutions to complex problems. In the case of multi-objective optimization, such a search yields iteratively improved approximations to the Pareto frontier, i.e. the set of best solutions contained along a trade-off curve of competing objectives.

To approximate the Pareto frontier, one method that is ubiquitous throughout the field of optimization is stochastic search. Stochastic search engines explore solution spaces by randomly mutating candidate guesses to generate new solutions. This mutation policy is employed by the most commonly used tools (e.g. NSGA-II, SPEA2, etc.), with the goal of a) avoiding local optima, and b) expand upon diversity in the set of generated approximations. Such "blind" mutation policies explore many sub-optimal solutions that are discarded when better solutions are found. Hence, this approach has two problems. Firstly, stochastic search can be unnecessarily computationally expensive due to evaluating an overwhelming number of candidates. Secondly, the generated approximations to the Pareto frontier are usually very large, and can be difficult to understand.

To solve these two problems, a more-directed, less-stochastic approach than standard search tools is necessary. This thesis presents GALE (Geometric Active Learning). GALE is an active learner that finds approximations to the Pareto frontier by spectrally clustering candidates using a near-linear time recursive descent algorithm that iteratively divides candidates into halves (called leaves at the bottom level). Active learning in GALE selects a minimally most-informative subset of candidates by only evaluating the two-most different candidates during each descending split; hence, GALE only requires at most, 2Log₂(N) evaluations per generation. The candidates of each leaf are thereafter non-stochastically mutated in the most promising directions along each piece. Those leafs are piece-wise approximations to the Pareto frontier.

The experiments of this thesis lead to the following conclusion: a near-linear time recursive binary division of the decision space of candidates in a multi-objective optimization algorithm can find useful directions to mutate instances and find quality solutions much faster than traditional randomization approaches. Specifically, in comparative studies with standard methods (NSGA-II and SPEA2) applied to a variety of models, GALE required orders of magnitude fewer evaluations to find solutions. As a result, GALE can perform dramatically faster than the other methods, especially for realistic models.

A qualitative research design in the form of a case study was employed. A quantitative method was also utilized in the form of a short questionnaire for demographic purposes in order to provide a general description of the sample. A purposive sample of 10 parenting learners, and two teachers was selected. The study was conducted in a Senior Secondary School that is located in Khayelitsha, a historically disadvantaged community in the Western Cape. Semi structured interviews of approximately ninety minutes each were conducted and audio taped. A thematic analysis was used to analyse the audio taped data from the transcribed interviews. The key findings from this research illustrate that there is a misunderstanding and miscommunication between teachers and learners about learner pregnancy. Pregnant learners hide pregnancy from the teachers to avoid comments and from being expelled from the school and consequently do not get any support from the school. On the other hand, the findings indicate that if the teachers were aware of their pregnancy and trained to deal with learner pregnancy, these learners would be supported by the school. Some of the recommendations were to develop the capacity of the teachers so that the school is able to provide an adolescent-professional-friendly service. A safe non-judgmental environment is required so that the learner is able to disclose her pregnancy status as early as possible to ensure that they receive the necessary support.

One of the key ideas in the research on mathematics education is that the mathematical knowledge that learners acquire is strongly tied to the particular situation in which it is learnt. This study investigated the contexts that learners in grades eight, nine and ten prefer to deal with in the learning of mathematics based on their personal, social, societal, cultural and contextual concerns or affinities. The study is situated in the large-scale project called the Relevance of School Mathematics Education II (ROSMEII), which is concerned with the application and the use of mathematical knowledge and processes in real life situations. It is based on a survey of learners from ten (10) secondary schools in the Oshana and Khomas regions of Namibia. The ten schools that were sampled represent the spectrum of schools in Namibia in both urban and semi-urban areas. The Rasch model of data analysis is employed to provide some insight into the contextual situations learners would like to deal with in their mathematical learning. The data obtained for this study was analysed using the WINSTEPS Version 3.65.0 suite of computer programs. The current study arises from a concern about the absence of the voices of learners in the contextual situations in mathematics selected by adults such as mathematics teachers, inspectorates and curriculum and materials developers. The assumption is that the inclusion of learners&rsquo
insights into mathematics curricular might enhance mathematical learning. The study reveals that school children have an intrinsic desire to learn about mathematical issues embedded in real-life contexts. Several items which Namibian learners have shown interest in are issues they experience in life out of school which are not directly dealt with in school, such as managing personal and financial affairs, health matters, technology, construction, engineering and government financial matters. However, learners indicated to have a low preference in contexts like lotteries and gambling, national and international politics, cultural products, all kinds of pop music and dancing. This thesis contends that the inclusion of contexts in the mathematics curriculum which are of interest to learners will go a long way in facilitating good performance of learners in mathematics.

The aim of this study was to determine the types of sport that are available for the learner with a physical disability in ordinary schools in the Western Cape and what prevents and facilitates participation in sport.

This thesis investigates grade seven learners perceived experiences in learning algebra.Things that learners do and say during algebra lessons and about algebra were investigated. The study was done at one of the previously disadvantaged schools in Cape Town, South Africa.The data were collected through observations, a questionnaire and interviews. Observations were made from the day the topic was started in two grade seven classes. Two different teachers taught the two classes. Focus group interviews were conducted, two group of learners, ten learners from each of the two classes were interviewed. Learners devised a number of strategies for solving problems related to sums and differences. The principal learning difficulties experienced by learners in algebra related to the transition from arithmetic conventions to those of algebra, the meaning of literal symbols and the recoginition of structures. It became obvious then that developing algebraic thinking is not necessarily dependent upon algebraic notation and that the presence of algebraic notation says little about the level of problem solving.

Local and international pundits concur that education systems play a pivotal role in fostering and developing values in learners. In some countries, like South Africa, the values and rights 
enshrined in the Constitution and the Bill of Rights resonate in the Schools Act. As one of the concerns of education is nationbuilding, my study investigates if the integration of the values does 
achieve tolerance and co-operation in the classroom by examining how learners make sense of values in the Mathematical Literacy curriculum. While I firmly believe that educational 
institutions have a responsibility to integrate positive values into all aspects of the school curriculum, it is my contention that learners cannot fully benefit from values specifically related to the 
Mathematical Literacy curriculum itself on their own. All stakeholders in education need to come together to establish an informed understanding of policy documents and reconcile the complexities and challenges that surround the transmission of values, so that educators will be able to assist learners in a meaningful way. The classroom life of a learner is intricately woven 
with that of the teacher. In order to unearth the views and practices of learners and teachers, I adopted a participatory approach. The qualitative study that ensued was conducted in three Mathematics Literacy classrooms at secondary schools in Cape Town, South Africa. The observation sessions afforded me the opportunity to experience and appreciate how the teachers 
integrate values into the Mathematical Literacy lessons while observing learners‟ behaviour in the classroom. The interactions and interviews with both learners and teachers aided in further unravelling their understanding and implementation of values in the Mathematical Literacy lessons. For learners to develop into responsible, caring and morally just citizens who arecapable of critical thought, they 
equire an education that provides them with the necessary opportunities and tools to develop. Mathematical Literacy is able to provide learners with the relevant opportunities and thinking 
tools to construct meaning around moral concepts. I strongly believe that for learners to accomplish this goal, educators need to be appropriately capacitated to facilitate opportunities for their 
learners.I did not find any evidence in the literature that suggests a fail-safe theoretical approach to success in values education. I am of the opinion that for any measure of success in values education, a combination of these theories of learning and moral development has to be employed.

This study examined the experiences of first-generation, economically disadvantaged, and disabled students’ utilization of TRIO Student Support Services and their perceptions related to factors associated with the services. The populace studied were Mexican-Americans, a subgroup of the Latin@ population as it is the fastest growing racial/ethnic minority group in the United States totaling approximately 12.5% of the nation and expected to almost double to 24% by 2050 (U.S. Census Bureau, 2000). Due to the abundance of Latin@s enrolling at community colleges (Fry, 2002; Tierney, 2005), it is important to do individualized studies on student experiences on their perspective of college interventions as a means to find ways to retain higher numbers of students, leading to higher graduation and transfer rates.

Using a qualitative, multiple case study approach, the researcher explored a border, rural community college. Social capital was used as the theoretical framework. Six, Mexican-American students served as the participants. The data collection methods were through semi-structured interviews over the course of the summer semester of 2013 at a Hispanic-Serving institution. The expected results were that students’ perceptions would validate the necessity for programs such as TRIO Student Support Services to serve as a tool for retention and completion at the two-year college or transferring to a university and completing.

Regular physical activity is linked to enhanced health and to reduced risk for mortality and the development of many chronic diseases in adults. However, many adults are either sedentary of less physically active. Children and adolescents are more physically active than adults, but participation in physical activity declines with age during adolescence. Girls are less active than boys, older children and adolescents are less active than younger children, and among girls, blacks are less active than whites. This study aimed to examine physical activity in female learners attending Kagiso Township high schools in Gauteng Province.

English is the most widely spoken language in the world and for this reason it would be of advantage for everyone to learn it. This thesis reports on the language ideologies and attitudes of Francophone learners towards English in the Central Province of Cameroon, a central African country. It offers a critical examination of the different attitudes and motivations of Francophone learners towards English as a third language at secondary schools in the city of Yaoundé
. It also presents the most important factors that appear to play a role in shaping their attitudes towards English, a language that many of the respondents appear to find hard to learn. Central to these factors are the prevailing language ideologies in Cameroon.

The number of children with disabilities under the age of 18 years around the world varies from 120 to 150 million. In many countries, throughout the world, the majority of children with disabilities either do not receive any form of education or, if they receive any, it is often inappropriate. UNESCO estimates that more than 90% of children with disabilities in developing countries do not attend schools. Rwanda has recently started inclusive education in a number of schools around the country for ensuring that children with disabilities have access to education. Despite this, in Rwanda, many children with disabilities do not attend school and this number is not known. This study aimed to identify the barriers to school attendance by children with disabilities in Rwanda.

The main objective of this study was to investigate the attitudes, perceptions and factors affecting the implementation of the Consumer Studies teaching portfolio in the
Educational Management Developmental Centres (EMDCs) of the Western Cape Education Department (WCED). The sub-objectives were firstly to assess the teachers' attitudes toward the Consumer Studies teaching portfolio as an assessment tool. A second aim was to describe teachers&rsquo
perceptions of assessment methods in the Consumer Studies teaching portfolio, while a third was to identify the factors that affect the development of the said portfolio.

This research used diary studies and interviews with five Japanese learners of English to investigate the different affective, cognitive and social factors that affected their learning of English in Cape Town between 2004 and 2005. The findings of this study corroborate arguments put forward by Gardner that factors such as learning goals, learning strategy, attitude, motivation, anxiety, self-confidence and cultural beliefs about communication affect the acquisition of a second language and correlate with one another.

This is a study of the discourses of empowerment and disempowerment that emerge from the critical discourse analysis (CDA) of life-histories written by two classes of Grade 11 high school learners in a township school in Cape Town, South Africa. The line of argument presented by this thesis is that there are political, socio-economic, familial and institutional factors and the discourses that construct them which affect learners&rsquo
resilience.

The study explored the comparison of grade 8 to 10 urban and peri-urban learners&rsquo
contexts preferences in mathematical literacy. There is currently a strong emphasis on the use of contexts for school mathematics. This has been also the case for South Africa when grade 10 learners have to make a choice between mathematics and mathematical literacy as one of their compulsory subjects for grade 10. This study focused more on the use of mathematics in real life situations. Data was collected by using questionnaires developed as part of the Relevance of School Mathematics Education (ROSME) project. The questionnaire dealt with contexts preferred by grade 10 learners from urban and peri-urban areas. The data were analysed using non-parametric statistical techniques. The findings radicate that there were contexts highly preferred by learners from both urban and peri-urban areas
least preferred by learners from both areas, highly preferred by learners from periurban areas but not by learners from urban areas and least preferred by learners from urban areas but not by those from peri-urban areas and vice versa. It is recommended that contexts highly preferred by learners should be incorporated in the learning experiences of learners.

The study catered for empirical and metaphysical dimensions of science and IKS. The study employed a quasi-experimental design as well as a qualitative research design. Two cohorts of students from a fictitiously named &ldquo
Culture Secondary School&rdquo
have been used in this study. The list of instruments for data collection were as follows: Conceptions of Fermentation (COF) questionnaire which was used to elicit learners&rsquo
pre- and post-test conceptions of fermentation with special reference to traditional beer or &ldquo
Umqombothi&rdquo
, an Attitudes to Science (ATS) questionnaire which was used to find out the learners&rsquo
worldviews, a Science Achievement Test (SAT) which was used to assess the learners&rsquo
generalised knowledge of fermentation, a classroom observation schedule as well as a focus group interview schedule to gather additional qualitative data. All the instruments were in English with all technical and difficult terms in both English and isiXhosa (the learners&rsquo
home language). Both groups were exposed to Science/IKS-based lessons. The only difference between the two groups was that, the experimental group (E group) was exposed to a Dialogical Argumentation Teaching Model (DAIM) and the comparison group (C group) to a traditional teaching approach. The data gatherred were both analyzed in terms of qualitative and quantitative descriptions.

Internationally, the rights of persons with disabilities to participate as full members of society through inclusive education has become a high priority with the adoption of the first legally binding treaty, the Convention on the Rights of Persons with Disabilities (2006). In keeping with our culture of acknowledging the rights of all, South Africa has already made great strides towards fulfilling these rights and is in the implementation phase of Education White Paper 6: Building an Inclusive Education and Training System (Department of Education, 2001). In spite of this, the practicability of implementing inclusive education is questioned by many. The inclusion of learners who are blind in neighbourhood schools, as opposed to &lsquo
special schools&rsquo
, is a particularly daunting task. However, the more local cases we have from which to draw insights, the better our chances of making inclusive education both practicable and widely accessible across a range of local contexts. A public, mainstream neighbourhood school that included two learners who are blind was therefore investigated to learn more about how the learners who are blind were physically, socially and academically included in the local school community. Qualitative data collection methods including semi-structured interviews and observations were used to uncover useful strategies, challenges and enabling factors that contributed to their successful inclusion. The findings revealed that the participants in this study had very little knowledge or experience in building an inclusive educational setting at the outset, but engaged in the process with open minds, creativity and trust. By adopting a collaborative approach and an attitude of &lsquo
failing forward&rsquo
, the objective of social and academic inclusion was to a great extent achieved in the school.

In developing economies and specifically Sub-Saharan Africa physical inactivity has been identified as a risk factor along with tobacco use, poor nutrition and poor diet as this has increasingly formed part of today&rsquo
s lifestyle. Physical activity declines with age this decline is more marked during the adolescent period. The aim of this study was to determine the prevalence of physical inactivity and factors associated with it among adolescents in Nairobi, Kenya. The overall aim of the study is to determine the factors influencing their levels of physical activity in relation to their socio-economic characteristics.