title: A hierarchical face recognition algorithm

authors: Bouckaert, Remco R.

subjects: computer science

abstract: In this paper, we propose a hierarchical method for face recognition where base classifiers are defined to make predictions based on various different principles and classifications are combined into a single prediction. Some features are more relevant to particular face recognition tasks than others. The hierarchical algorithm is flexible in selecting features relevant for the face recognition task at hand. In this paper, we explore various features based on outline recognition, PCA classifiers applied to part of the face and exploitation of symmetry in faces. By combining the predictions of these features we obtain superior performance on benchmark datasets (99.25% accuracy on the ATT dataset) at reduced computation cost compared to full PCA.

text: A hierarchical face recognition algorithm In this paper, we propose a hierarchical method for face recognition where base classifiers are defined to make predictions based on various different principles and classifications are combined into a single prediction. Some features are more relevant to particular face recognition tasks than others. The hierarchical algorithm is flexible in selecting features relevant for the face recognition task at hand. In this paper, we explore various features based on outline recognition, PCA classifiers applied to part of the face and exploitation of symmetry in faces. By combining the predictions of these features we obtain superior performance on benchmark datasets (99.25% accuracy on the ATT dataset) at reduced computation cost compared to full PCA.

year: 2009

title: Vegetation studies in the Taranaki land district, New Zealand

authors: Clarkson, Bruce D.

abstract: Sampling of the indigenous vegetation of the Taranaki Land District was carried out to describe and explain significant features of vegetational change along environmental gradients. Five major locations were sampled; the three volcanic mountains of Egmont National Park (Egmont, Pouakai and Kaitake), the associated volcanic ring plain and the Taranaki Upland. The sampling which was mainly along altitudinal and moisture gradients involved the collection of both quantitative and semi-quantitative plot data.

Direct and indirect gradient analyses were then carried out on the data; the techniques employed included graphing, ordination and classification. Analysis enabled the definition of the main vegetation types at each of the sampling locations and of the important environmental factors associated with the vegetation pattern. 

Comparison of the results obtained at each of the sampling locations revealed differences in the structure and composition of the vegetation and in the pattern of vegetational change along the gradients. The three volcanic mountains within Egmont National Park show differences in the vegetation consistent with the sequence of volcanic activity (the Taranaki Volcanic Succession). Sectors of Mt Egmont exhibit differences which relate closely to the pattern of recent eruptions particularly the Burrell eruption of 1655 A.D. The vegetation at equivalent altitudes on Pouakai, an older more eroded volcanic remnant, is at a more advanced stage of development. A complex pattern of species (woody species and tree ferns) distribution on the three mountains (Egmont, Pouakai and Kaitake) is outlined and attributed in some instances to the changing availability of habitats on each mountain. This is associated with the sequence of mountain building, erosion and dissection. The vegetation pattern of the Taranaki Upland by contrast more closely reflects the pattern of topography and substrate and the forests are richer in vascular species. Analysis of the distribution of species (woody species and tree ferns) shows that inland Taranaki was the probable source for almost all of the species found in the forests of Egmont National Park. 

Comparisons of the pattern of vegetational change along altitudinal gradients of the mountains of Egmont National Park and some other southern hemisphere mountains reveal certain similarities. With respect to other North Island (New Zealand) volcanic mountains examined the similarities are marked. Like Mt Egmont, Pouakai and Kaitake these mountains all support podocarp-broadleaved forests from which the beech species (Nothofagus spp.) are absent. The forests of Egmont National Park are interpreted as illustrating stages of a landscape and vegetation succession apparent on volcanic mountains throughout the North Island. Features which characterise the present stage of development of the forests of Mt Egmont include the overwhelming dominance of kamahi (Weinmannia racemosa var. racemose), the absence of forest tree species such as quintinia (Quintinia serrata) and the relatively low altitude tree-line.

text: Vegetation studies in the Taranaki land district, New Zealand Sampling of the indigenous vegetation of the Taranaki Land District was carried out to describe and explain significant features of vegetational change along environmental gradients. Five major locations were sampled; the three volcanic mountains of Egmont National Park (Egmont, Pouakai and Kaitake), the associated volcanic ring plain and the Taranaki Upland. The sampling which was mainly along altitudinal and moisture gradients involved the collection of both quantitative and semi-quantitative plot data.

Direct and indirect gradient analyses were then carried out on the data; the techniques employed included graphing, ordination and classification. Analysis enabled the definition of the main vegetation types at each of the sampling locations and of the important environmental factors associated with the vegetation pattern. 

Comparison of the results obtained at each of the sampling locations revealed differences in the structure and composition of the vegetation and in the pattern of vegetational change along the gradients. The three volcanic mountains within Egmont National Park show differences in the vegetation consistent with the sequence of volcanic activity (the Taranaki Volcanic Succession). Sectors of Mt Egmont exhibit differences which relate closely to the pattern of recent eruptions particularly the Burrell eruption of 1655 A.D. The vegetation at equivalent altitudes on Pouakai, an older more eroded volcanic remnant, is at a more advanced stage of development. A complex pattern of species (woody species and tree ferns) distribution on the three mountains (Egmont, Pouakai and Kaitake) is outlined and attributed in some instances to the changing availability of habitats on each mountain. This is associated with the sequence of mountain building, erosion and dissection. The vegetation pattern of the Taranaki Upland by contrast more closely reflects the pattern of topography and substrate and the forests are richer in vascular species. Analysis of the distribution of species (woody species and tree ferns) shows that inland Taranaki was the probable source for almost all of the species found in the forests of Egmont National Park. 

Comparisons of the pattern of vegetational change along altitudinal gradients of the mountains of Egmont National Park and some other southern hemisphere mountains reveal certain similarities. With respect to other North Island (New Zealand) volcanic mountains examined the similarities are marked. Like Mt Egmont, Pouakai and Kaitake these mountains all support podocarp-broadleaved forests from which the beech species (Nothofagus spp.) are absent. The forests of Egmont National Park are interpreted as illustrating stages of a landscape and vegetation succession apparent on volcanic mountains throughout the North Island. Features which characterise the present stage of development of the forests of Mt Egmont include the overwhelming dominance of kamahi (Weinmannia racemosa var. racemose), the absence of forest tree species such as quintinia (Quintinia serrata) and the relatively low altitude tree-line.

year: 1981

title: Exploring inequity in access to medications for Type 2 Diabetes in primary care in the Waikato region: Final report

authors: Lawrenson, Ross

abstract: Type 2 diabetes (T2D) is a growing health issue in New Zealand (NZ) that disproportionately affects twice as many Māori as non-Māori and an increasing number of younger people. T2D is associated with a range of microvascular and macrovascular complications, chronic kidney disease and cardiovascular disease (CVD), the latter being the greatest cause of morbidity and mortality in this patient group. However, complications are reduced in patients that have improved glycaemic control. To achieve optimal outcomes and reduce the chance of diabetes-related complications, patients should aim to have their glycated haemoglobin (HbA1c) measurement less than 53 mmol/mol if possible.

Diabetes is primarily managed in primary care, and a number of recent publications suggest that there is considerable inequity in the management of diabetes in New Zealand, particularly for Māori. In an earlier piece of work we have shown that Maori are significantly less likely than non-Maori to be prescribed metformin, but that once prescribed it they are equally likely to have the medication dispensed. This suggests that there may be issues that can be addressed within primary care that are influencing the use of diabetes medications.
Thus, the aim of this small piece of work was to characterise diabetes medication use in a Waikato primary care population, and to report on medication adherence and association with HbA1c levels.

text: Exploring inequity in access to medications for Type 2 Diabetes in primary care in the Waikato region: Final report Type 2 diabetes (T2D) is a growing health issue in New Zealand (NZ) that disproportionately affects twice as many Māori as non-Māori and an increasing number of younger people. T2D is associated with a range of microvascular and macrovascular complications, chronic kidney disease and cardiovascular disease (CVD), the latter being the greatest cause of morbidity and mortality in this patient group. However, complications are reduced in patients that have improved glycaemic control. To achieve optimal outcomes and reduce the chance of diabetes-related complications, patients should aim to have their glycated haemoglobin (HbA1c) measurement less than 53 mmol/mol if possible.

Diabetes is primarily managed in primary care, and a number of recent publications suggest that there is considerable inequity in the management of diabetes in New Zealand, particularly for Māori. In an earlier piece of work we have shown that Maori are significantly less likely than non-Maori to be prescribed metformin, but that once prescribed it they are equally likely to have the medication dispensed. This suggests that there may be issues that can be addressed within primary care that are influencing the use of diabetes medications.
Thus, the aim of this small piece of work was to characterise diabetes medication use in a Waikato primary care population, and to report on medication adherence and association with HbA1c levels.

year: 2021-08-17