title: Best-first Decision Tree Learning

authors: Shi, Haijian

subjects: attribute

abstract: In best-first top-down induction of decision trees, the best split is added in each step (e.g. the split that maximally reduces the Gini index). This is in contrast to the standard depth-first traversal of a tree. The resulting tree will be the same, just how it is built is different. The objective of this project is to investigate whether it is possible to determine an appropriate tree size on practical datasets by combining best-first decision tree growth with cross-validation-based selection of the number of expansions that are performed. Pre-pruning, post-pruning, CART-pruning can be performed this way to compare.

text: Best-first Decision Tree Learning In best-first top-down induction of decision trees, the best split is added in each step (e.g. the split that maximally reduces the Gini index). This is in contrast to the standard depth-first traversal of a tree. The resulting tree will be the same, just how it is built is different. The objective of this project is to investigate whether it is possible to determine an appropriate tree size on practical datasets by combining best-first decision tree growth with cross-validation-based selection of the number of expansions that are performed. Pre-pruning, post-pruning, CART-pruning can be performed this way to compare.

year: 2007

title: Polarisation and wavelength selective transmission through nanohole structures with multiple grating geometry

authors: Nemanya, Sedoglavich

subjects: apertures

abstract: Excitation and localization of surface plasmon polariton modes in metal-dielectric structures can be utilized to construct nanophotonic materials and devices with tuneable optical dispersion. We present a selective polariton generator (SPG) device that demonstrates switching of light transmission based on surface plasmon antennae principles. This polarization-sensitive structure selectively generates and transports polaritons of a desired wavelength through subwavelength apertures. Two of these SPGs have been combined around a nanohole into a new, single device that allows polarization and wavelength selective switching of transmission. The multi-state operation is confirmed by experiment results.

text: Polarisation and wavelength selective transmission through nanohole structures with multiple grating geometry Excitation and localization of surface plasmon polariton modes in metal-dielectric structures can be utilized to construct nanophotonic materials and devices with tuneable optical dispersion. We present a selective polariton generator (SPG) device that demonstrates switching of light transmission based on surface plasmon antennae principles. This polarization-sensitive structure selectively generates and transports polaritons of a desired wavelength through subwavelength apertures. Two of these SPGs have been combined around a nanohole into a new, single device that allows polarization and wavelength selective switching of transmission. The multi-state operation is confirmed by experiment results.

year: 2008

title: Mental health inpatient services: Improving our understanding of the needs of Maori when acutely unwell

authors: Wharewera-Mika, Julie

subjects: Maori

abstract: There are many possible explanations for the pattern of Maori overrepresentation in mental health acute services. This research project focuses on how services can optimally meet the needs of Maori to improve outcomes. This doctoral research in progress is about claiming space for Maori to have a voice in identifying factors that contribute to recovery and Whanau Ora, and offering recommendations to improve the effectiveness of existing services to better meet the needs of Maori Tangata Whaiora and Whanau.

text: Mental health inpatient services: Improving our understanding of the needs of Maori when acutely unwell There are many possible explanations for the pattern of Maori overrepresentation in mental health acute services. This research project focuses on how services can optimally meet the needs of Maori to improve outcomes. This doctoral research in progress is about claiming space for Maori to have a voice in identifying factors that contribute to recovery and Whanau Ora, and offering recommendations to improve the effectiveness of existing services to better meet the needs of Maori Tangata Whaiora and Whanau.

year: 2008