We present an active learning algorithm for identifying viable process conditions in magnetron sputtering experiments. The algorithm trains a classifier to predict which gas pressure and magnetron power combinations yield stable discharge with deposition rates exceeding a minimum threshold. A computation-based oracle that labels experiments using QCM readings facilitates a fully automated learning procedure, laying the groundwork for a self-driving lab where novel materials will be explored for next-generation solar cells. Upon evaluation, the active learning algorithm results in significantly higher sample efficiency than traditional supervised learning across a range of magnetron sputtering experiments. Moreover, a sampling sequence analysis shows that active learning enables an informed search of the process parameter space, generating patterns that approximate Paschen’s law. The work presented in this thesis serves as a first step toward a fully automated materials synthesis process, where the input region of viable synthesis parameters can be identified with minimal experimentation. The solution allows researchers to efficiently narrow the search space of optimal process conditions for targeted materials design.

This dissertation comprises several studies addressing supervised learning problems where the supervision is imperfect. Firstly, we investigate the margin conditions in active learning. Active learning is characterized by its special mechanism where the learner can sample freely over the feature space and exploit mostly the limited labeling budget by querying the most informative labels. Our primary focus is to discern critical conditions under which certain active learning algorithms can outperform the optimal passive learning minimax rate. Within a non-parametric multi-class classification framework,our results reveal that the uniqueness of Bayes labels across the feature space serves as the pivotal determinant for the superiority of active learning over passive learning. Secondly, we study the estimation of central mean subspace (CMS), and its application in transfer learning. We show that a fast parametric convergence rate is achievable via estimating the expected smoothed gradient outer product, for a general class of covariate distribution that admits Gaussian or heavier distributions. When the link function is a polynomial with a degree of at most r and the covariates follow the standard Gaussian, we show that the prefactor depends on the ambient dimension d as d^r. Furthermore, we show that under a transfer learning setting, an oracle rate of prediction error as if the CMS is known is achievable, when the source training data is abundant. Finally, we present an innovative application involving the utilization of weak (noisy) labels for addressing an Individual Tree Crown (ITC) segmentation challenge. Here, the objective is to delineate individual tree crowns within a 3D LiDAR scan of tropical forests, with only 2D noisy manual delineations of crowns on RGB images available as a source of weak supervision. We propose a refinement algorithm designed to enhance the performance of existing unsupervised learning methodologies for the ITC segmentation problem.

Large underfunded classrooms are indicative of the situation found in many developing countries. These limitations often lead to the ineffective teacher-centred approach dominating classroom instruction in these countries. The aim of the study was to examine active learning strategies used by teachers in large unfunded Physics classrooms, in Kerala, India. This study used a qualitative approach utilising a case study method. The data collection process involved mainly unstructured interviews, lesson observations and the analysis of documents. The results of the study indicate that despite the difficulties faced in India, similar to those faced by other developing countries, the Indian state of Kerala implements and supports active learning rather than the more common teacher-centred approach. The research defines the common forms of active learning in the Physics lessons and critically examines the core elements of the learner-centred teaching approaches. Successes have been found in the implementation of active, collaborative, cooperative and problem-based learning in the large underfunded Physics classes. The results of the research suggest that teachers need to be highly trained, resourceful, creative, hardworking and sometimes go above and beyond the required duties to make active learning in large underfunded Physics classroom a success. / Science and Technology Education / M. Ed. (Natural Science Education)

The general aim of this study was to investigate the implementation of active learning approaches in the teaching of English Language support courses to first-year university students. The study was planned to identify factors that affected the implementation of active learning in classrooms where English as a Foreign Language (EFL) is taught, the perceptions of EFL instructors and their students regarding active learning, the linkage between assessment practices and productive skills, and the commonly used types of active learning techniques. The study was conducted in three Ethiopian universities and employed a qualitative approach to data generation and analysis. As such, data generation strategies focused on relevant documents, classroom observation, individual interviews, and focus group discussions. The participants of the study included 27 EFL instructors and their students (17 groups of focus group discussion), enrolled for English Language support courses at freshman level. Based on my analysis of the data, the primary barriers to the implementation of active learning techniques in EFL classrooms were as follows: Students’ poor background exposure to the English language; Students’ negative associations with language learning; EFL instructors’ ineffective classroom management; The adverse influence of students’ external social environments; Dependency in group work; low relevance of English Language support courses; Lack of administrative support from Universities. The participants of the study were aware of the importance of active learning and student-centred approaches and in favour of the implementation thereof. Despite this, they did not feel that they practised them effectively in the teaching and learning process. In fact, the instructors explained that, in the face of very unfavourable circumstances for active learning and student-centred approaches, they felt utterly disappointed, with no sense of achievement, when attempting to use these approaches in their classrooms; they did not believe that the existing situation was conducive to the implementation of active learning and student-centred approach. Furthermore, these EFL instructors did not use a variety of active learning techniques in the teaching and learning process of English supportive courses. The dominant techniques they used were group work and pair work. They did not utilise alternative techniques to teach essential productive skills (i.e. speaking and writing).The participants also indicated that the assessment techniques they used were not closely related to lesson objectives or language learning goals in the development of productive skills. The relationship between assessment types and active learning techniques was characterised by traditional pencil-and-paper tests designed solely for grading purposes; and not to improve the actual learning process. In grading, the weight given to productive skills was very small in contrast to that assigned to receptive skills (i.e. listening and reading), grammar and vocabulary. Their relationship involved teaching simply to prepare students for tests, irrelevant and untimely feedback, substandard assessment, absence of dynamism in the two-dimensional assessment techniques, and incongruence between assessment techniques and actual language skills and competence. In relation to feedback, both the students and their instructors pointed out that EFL students were more concerned with their grades than with the potential to learn when receiving feedback on their writing or oral presentations. In line with these findings, this thesis concluded by offering relevant recommendations for alleviating the problems observed in the teaching of English language support courses - both in general and with particular regard to productive skills development. / Curriculum and Instructional Studies / D. Ed. (Didactics)

Large underfunded classrooms are indicative of the situation found in many developing countries. These limitations often lead to the ineffective teacher-centred approach dominating classroom instruction in these countries. The aim of the study was to examine active learning strategies used by teachers in large unfunded Physics classrooms, in Kerala, India. This study used a qualitative approach utilising a case study method. The data collection process involved mainly unstructured interviews, lesson observations and the analysis of documents. The results of the study indicate that despite the difficulties faced in India, similar to those faced by other developing countries, the Indian state of Kerala implements and supports active learning rather than the more common teacher-centred approach. The research defines the common forms of active learning in the Physics lessons and critically examines the core elements of the learner-centred teaching approaches. Successes have been found in the implementation of active, collaborative, cooperative and problem-based learning in the large underfunded Physics classes. The results of the research suggest that teachers need to be highly trained, resourceful, creative, hardworking and sometimes go above and beyond the required duties to make active learning in large underfunded Physics classroom a success. / Science and Technology Education / M. Ed. (Natural Science Education)

The project offers Taiwanese teachers who work with adults a new concept of teaching crosscultural negotiation skills as part of their EFL instruction. It also presents Taiwanese teachers with a method of analyzing their educational practice to encourage more active and engaged teaching with a useful curriculum and its corresponding assessment.

The aim of this study was to investigate the effect of an active learning approach (ALA) on the achievement of 11 th grade learners in Newton’s laws of motion, The case study was done in one school by comparing the achievement of learners in Newton’s laws of motion through an Active Learning Approach (ALA) with that of learners taught through Traditional Direct I nstruction (TDI) and to determine whether learners taught with ALA retained the material better than those taught with TDI. Two grade 11 classes in one school in the Queenstown District of the Eastern Cape were selected on their performance in two differen t tests and used as case study . The Force Concept Inventory was used to determine the achievements and retention of knowledge of the two groups. The effect of the active lear ning approach on the treatment group was also measured by ask ing each learner in t he group to complete a learner assessment of instruction form. The treatment group was also subjected to a classroom group interview. T he following information emerged from the study: i) Learners taught using the ALA achieved significantly better in FCI pos t - test than those taught with traditional direct instruction. ii) In the retention of knowledge test, the mean score of the learners taught using the ALA was 4.8% higher than those taught with TDI although insignificant. iii) Learners subjected to the ALA liked the instructional approach and as such put in extra time to learn. The findings suggest that the active learning approach had positive effect on the achievement of the Grade 11 learners and thus, can be adapted to enhance learning in the classroom. / Physics

Museums and schools evolved as the definition of the concept of education to describe a lifelong process of developing knowledge, skills, values and attitudes that take place not only in the classroom, but also in a variety of formal and informal contexts and settings. In order to fulfil and extend the potential of the partnership, museum educators and school teachers should be assisted to develop a comprehensive understanding of the nature of the museum-school collaboration. They should learn the difference between museums and classrooms. When the Botswana National Museum was established in 1968, the Botswana government aspired to avail information relating to Botswana customs, indigenous knowledge system and values to Botswana‘s future citizens, with the hope that the information and artefacts collected at the time would retell the story of Botswana to learners and the public alike. The Botswana National Museum, through its educational programmes, has the capability to help educate learners; make teaching and learning an exciting undertaking; and provide the opportunities for hands-on activities and interaction with real objects. In order to address the research question posed for this study, the researcher conducted open-ended interviews with a sample comprising 40 participants: 10 teachers, 10 learners, 10 museum employees and 10 curriculum developers. The data collected from the interviews were decoded and presented in narrative form. The responses were presented using three identified categories: the curriculum development process in Botswana; the typical learner activities in the classroom and in the Botswana National Museum; and collaboration between the Botswana National Museum and schools. The data analysis revealed that the curriculum development process in Botswana was exclusively done by curriculum developers. Learners, teachers and museum employees were not involved. The Botswana National Museum‘s education programmes are not familiar to all role-players. All role-players were positive regarding a possible collaboration with the Botswana National Museum. Generic and specific recommendations were put forward to this end. / Educational Studies / D. Ed. (Didactics)

Meaningful learning requires active teaching and learning approaches. Thus, with a specific focus on Mathematics teaching at university in Oramia, the study aimed to: • examine the extent to which active learning/student-centered approaches were implemented; • assess the attitudes of university lecturers towards active-learning; • investigate whether appropriate training and support have been provided for the implementation of an active learning approaches • assess the major challenges that hinder the implementation of active learning approaches and • recommend ways that could advance the use of active learning approaches in Mathematics teaching at university. A mixed-methods design was used. Among the six universities in the Oromia Regional State of Ethiopia, two of the newly established universities (younger than 5 years) and two of the old universities (15 years and older) were involved in the study. A total of 84 lecturers participated in the study and completed questionnaires. This was complemented by a qualitative approach that used observation checklists and interviews for data gathering: 16 lessons were observed while the lecturers taught their mathematics classes (two lecturers from each of the four sample universities were twice observed). In addition, semi-structured interviews were conducted with four mathematics department heads and eight of the observed lecturers. The study adhered to ethical principles and to applied several techniques to enhance the validity/trustworthiness of the findings. / Psychology of Education / D. Ed. (Psychology of Education)

The researcher thinks that there is a need to assess learning programmes for the Senior Phase learners at Environmental Education Centres (EEC' s) in Mpumalanga in order to ensure that resources provided by the Department of Agriculture Conservation and Environment in Mpumalanga(DACEM) are utilized for what they are intended. Thus the dissertation investigation is about whether learning programmes for the Senior Phase learners in Mpumalanga are assessed for their quality, namely, effectiveness and relevancy within the Outcomes-Based Education (OBE) system. Each directorate or section of the Mpumalangas' Department of Agriculture Conservation and Environment is obliged to ensure that appropriate policy guidelines are put in place to assist Environmental Officers (EO' s) to implement the Core Functions of the Environmental Education (EE) Directorate. Sometimes EO's need assistance in implementing policy guidelines. In this investigation EO' s were provided with an opportunity to translate policy into action by participating in the workshops conducted by the researcher. The participation of the EO' s meant that they had to learn how to develop learning programmes that are strongly guided by the EE Directorate's policy guidelines and Core Functions. / Educational Studies / M. Ed. (Environmental Education)