Intelligent automotive thermal comfort control
- Authors: Kranz, Jürgen
- Date: 2011
- Subjects: Automobiles -- Heating and ventilation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:9645 , http://hdl.handle.net/10948/1435 , Automobiles -- Heating and ventilation
- Description: Mobility has become a substantial part in our society. Since we spend a lot of our available time on the road, we expect the automotive environment to provide similar comfort levels than residential buildings. Within this context, this research thesis especially focuses on automotive thermal comfort control. The automotive cabin is a very special environment, which is characterized by extreme inhomogeneity and overall transient behavior. Thermal comfort is a very vague and a very subjective term, which depends on physiological and psychological variables. Theories for thermal comfort in transient environments have not been fully established yet and researchers are still busy with its investigation. At present, automotive industry relies on extensive thermal comfort models, manikins and powerful simulation tools to assess and control thermal comfort. This thesis studies the application of artificial intelligence and proposes a blackbox approach which aims for extracting thermal comfort knowledge directly from human's interaction with the HVAC controls. This methodology avoids the use of human physiological and psychological thermal comfort models and does not require any a-priori knowledge. A novel comfort acquisition tool has been developed and has been integrated into a research vehicle in order to gather the required data for system learning. Data has been collected during spring, autumn and summer conditions in Southern Africa. Methods of data mining have been applied and an intelligent implementation using artificial neural networks has been proposed. The achieved results are promising and allow for about 87 perecent correct classification. It is concluded that methods of artificial intelligence perform well and are far superior compared to conventional approaches. These methods can be used as a powerful tool for the development process of vehicle air-conditioning controls and have great potential for time and cost reduction.
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- Date Issued: 2011
An investigation into the impact of the use of an integrated learning system on mathematics standard grade paper 2 marks of grade 12 learners of one high school in the Nelson Mandela Metropolitan area
- Authors: Barnard, Stefanus van Rooyen
- Date: 2004
- Subjects: Mathematics -- Research -- South Africa -- Port Elizabeth , Mathematics -- Examinations -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Doctoral , DEd
- Identifier: vital:10780 , http://hdl.handle.net/10948/248 , Mathematics -- Research -- South Africa -- Port Elizabeth , Mathematics -- Examinations -- South Africa -- Port Elizabeth
- Description: The aim of this study was an exploration of the relationship between the use of an Integrated Learning System (ILS), entitled Master Maths, as a supplement to traditional mathematics instruction, and mathematics achievement as measured by the Paper 2 marks of the National Mathematics Examinations for standard grade learners in grade 12. The use of technology in education has increased over the past decade. One way of integrating technology into instructional programmes has been through the use of Integrated Learning Systems (ILSs). The review of the literature traces the history of computer-assisted instruction as conducted on ILSs. The review of recent research studies focuses on the impact of ILSs on learner achievement in mathematics internationally and in the South African context. This study used quantitative and qualitative methods to research the impact of the Master Maths programme on mathematics achievement. Twenty-six learners of the 133 standard grade learners from one high school in New Brighton, Port Elizabeth were selected for each of the experimental and control groups. The experimental group worked on the Master Maths programme for twelve sessions of three hours each. The results of the quantitative analysis show that the intervention did not make a significant difference to the experimental group. The Master Maths programme led to only a 0.56% increase in the marks of the experimental group. The qualitative analysis drew a comparison between the modules of the Master Maths programme and the relevant examination questions in terms of content covered and cognitive levels. The researcher used Bloom’s Cognitive Taxonomy to evaluate the cognitive levels. The data show that it was easier for the learners to obtain higher marks in the module tests than in the examination questions. The data indicate that the module tests were easier than the examination questions in that the cognitive levels of the module tests were lower. The data confirm that there is a gap between the acquisition and evaluation of core skills tested by the modules used in the intervention and the wider knowledge and skills tested in the examination.
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- Date Issued: 2004