title: Full model selection in the space of data mining operators

authors: Sun, Quan

subjects: genetic algorithm

abstract: We propose a framework and a novel algorithm for the full model selection (FMS) problem. The proposed algorithm, combining both genetic algorithms (GA) and particle swarm optimization (PSO), is named GPS (which stands for GAPSO-FMS), in which a GA is used for searching the optimal structure of a data mining solution, and PSO is used for searching the optimal parameter set for a particular structure instance. Given a classification or regression problem, GPS outputs a FMS solution as a directed acyclic graph consisting of diverse data mining operators that are applicable to the problem, including data cleansing, data sampling, feature transformation/selection and algorithm operators. The solution can also be represented graphically in a human readable form. Experimental results demonstrate the benefit of the algorithm.

text: Full model selection in the space of data mining operators We propose a framework and a novel algorithm for the full model selection (FMS) problem. The proposed algorithm, combining both genetic algorithms (GA) and particle swarm optimization (PSO), is named GPS (which stands for GAPSO-FMS), in which a GA is used for searching the optimal structure of a data mining solution, and PSO is used for searching the optimal parameter set for a particular structure instance. Given a classification or regression problem, GPS outputs a FMS solution as a directed acyclic graph consisting of diverse data mining operators that are applicable to the problem, including data cleansing, data sampling, feature transformation/selection and algorithm operators. The solution can also be represented graphically in a human readable form. Experimental results demonstrate the benefit of the algorithm.

year: 2012

title: Supercapacitor-assisted LED (SCALED) technique for renewable energy systems: a very low frequency design approach with short-term DC-UPS capability eliminating battery banks

authors: Jayananda, Dilini

subjects: Science & Technology

abstract: The fluctuating nature of solar energy necessitates suitable energy storage systems. Compared to typical battery banks, supercapacitors offer longer cycle life eliminating the need to replace them regularly. However, compared to a typical maximum power point tracking controller, where the battery bank and resistive load fed by a switch-mode DC–DC converter allows impedance matching for maximum power transfer, a supercapacitor bank's significantly large capacitive load does not permit the typical impedance matching for maximum power transfer. This study compares the theoretical difference between battery versus supercapacitor energy storage, and highlights of the supercapacitor-assisted LED converter technique in achieving high-efficiency renewable energy-based DC-microgrid systems.

text: Supercapacitor-assisted LED (SCALED) technique for renewable energy systems: a very low frequency design approach with short-term DC-UPS capability eliminating battery banks The fluctuating nature of solar energy necessitates suitable energy storage systems. Compared to typical battery banks, supercapacitors offer longer cycle life eliminating the need to replace them regularly. However, compared to a typical maximum power point tracking controller, where the battery bank and resistive load fed by a switch-mode DC–DC converter allows impedance matching for maximum power transfer, a supercapacitor bank's significantly large capacitive load does not permit the typical impedance matching for maximum power transfer. This study compares the theoretical difference between battery versus supercapacitor energy storage, and highlights of the supercapacitor-assisted LED converter technique in achieving high-efficiency renewable energy-based DC-microgrid systems.

year: 2020

title: The Māori female - her body, spirituality, sacredness and mana : a space within spaces

authors: August, Wikitoria

subjects: Body image in women

abstract: This thesis is an exploration of bodily rituals, practices and cultural spaces of the female Māori body. Critical social theories and Kaupapa Māori research paradigms are combined to disrupt and challenge hegemonic Western knowledges. Qualitative methods - interviews, focus groups and autobiographical experience - are used to understand bodily practices that pertain to being Māori and female. There are three points to my discussion. I argue first, that the embodied relationship between Māori women and urupā and food gathering spaces rests on notions of Papatūānuku and female reproduction. During menstruation or pregnancy most women are restricted from urupā. Many participants, however, view this tikanga positively and describe it as making them feel special. Second, I examine the ways in which Māori female bodies are colonised and positioned between Western patriarchal and traditional ways of being. Due to various reasons surrounding colonisation, there are gaps in younger generations' Māori knowledge and this has led to tensions about which space to occupy. Finally, I discuss mana and conclude by asserting that the Māori female body has not lost individual mana, despite the efforts of colonisation to take mana away from Māori women. Throughout this research I offer cultural perspectives in order to prompt new ways of thinking about the Māori female body. 

The views expressed in this thesis are not the views of all Māori. Practices, tikanga and knowledges vary between different iwi, hapū and rohe.

text: The Māori female - her body, spirituality, sacredness and mana : a space within spaces This thesis is an exploration of bodily rituals, practices and cultural spaces of the female Māori body. Critical social theories and Kaupapa Māori research paradigms are combined to disrupt and challenge hegemonic Western knowledges. Qualitative methods - interviews, focus groups and autobiographical experience - are used to understand bodily practices that pertain to being Māori and female. There are three points to my discussion. I argue first, that the embodied relationship between Māori women and urupā and food gathering spaces rests on notions of Papatūānuku and female reproduction. During menstruation or pregnancy most women are restricted from urupā. Many participants, however, view this tikanga positively and describe it as making them feel special. Second, I examine the ways in which Māori female bodies are colonised and positioned between Western patriarchal and traditional ways of being. Due to various reasons surrounding colonisation, there are gaps in younger generations' Māori knowledge and this has led to tensions about which space to occupy. Finally, I discuss mana and conclude by asserting that the Māori female body has not lost individual mana, despite the efforts of colonisation to take mana away from Māori women. Throughout this research I offer cultural perspectives in order to prompt new ways of thinking about the Māori female body. 

The views expressed in this thesis are not the views of all Māori. Practices, tikanga and knowledges vary between different iwi, hapū and rohe.

year: 2004