title: Difference in details: transfer learning case study of "cryptic" plants and moths

authors: Vetrova, Varvara

subjects: Machine learning

abstract: Can we classify species of very similar looking organisms quickly and accurately using only out of the box feature transfer? What if we only have small number of images? This experimental paper is part of on-going project on species recognition research and evaluates transfer learning and fine-tuning approaches on two highly specialized fine-grained datasets. The two fine-grained datasets were specifically assembled for the purpose of this research. These datasets consist of images of New Zealand native species of moths and ”cryptic” plants of Genus Corposma found also in New Zealand. We compare results from finetuning experiments with performance of transfer learning without fine-tuning. The latter results are based on features extracted from various levels of depth in the InceptionV3 network, including fully connected layers. The extracted features serve as inputs to a number of classification algorithms. We observe contrasting results for the two datasets. For the dataset of moths, the method based on features extracted from deep levels of the InceptionV3 network outperforms fine-tuning in accuracy (90.09% versus 87.18%). This is not the case for the dataset of cryptic plants (60.46% versus 74.37%). Despite both datasets being fine-grained in nature, these experimental differences could be attributed to intrinsically different morphology of organisms and warrant further investigation.

text: Difference in details: transfer learning case study of "cryptic" plants and moths Can we classify species of very similar looking organisms quickly and accurately using only out of the box feature transfer? What if we only have small number of images? This experimental paper is part of on-going project on species recognition research and evaluates transfer learning and fine-tuning approaches on two highly specialized fine-grained datasets. The two fine-grained datasets were specifically assembled for the purpose of this research. These datasets consist of images of New Zealand native species of moths and ”cryptic” plants of Genus Corposma found also in New Zealand. We compare results from finetuning experiments with performance of transfer learning without fine-tuning. The latter results are based on features extracted from various levels of depth in the InceptionV3 network, including fully connected layers. The extracted features serve as inputs to a number of classification algorithms. We observe contrasting results for the two datasets. For the dataset of moths, the method based on features extracted from deep levels of the InceptionV3 network outperforms fine-tuning in accuracy (90.09% versus 87.18%). This is not the case for the dataset of cryptic plants (60.46% versus 74.37%). Despite both datasets being fine-grained in nature, these experimental differences could be attributed to intrinsically different morphology of organisms and warrant further investigation.

year: 2018

title: An Investigation of the Health Benefits of Honey as a Replacement For Sugar In the Diet

authors: Chepulis, Lynne Merran

subjects: honey

abstract: Sugar (primarily sucrose) has been a part of the daily diet for literally hundreds of years, but research is now suggesting that sugar intake can be detrimental to our health. In particular, excessive consumption of simple sugars with high glycemic index (GI) values have been shown to cause overeating and weight gain. As well, elevated postprandial hyperglycemia can result after consuming sugars and this has been linked to disease formation and progression, the development of advanced glycation endproducts, inflammation and increased mortality rates. Honey has been recognised as having a number of beneficial health properties, including slower uptake into the bloodstream, a pharmacological action of reducing blood glucose levels and a high level of bioavailable antioxidants, all of which may mean that honey could be less harmful to health than sucrose in the diet. This study was therefore designed to investigate the health benefits of honey in the diet as a replacement for sucrose, using small animal studies. As well, because of the interest in using honey as a replacement for sucrose in sweetened dairy foods, a small number of in vitro investigations were carried out to determine whether honey could retain its bioactive properties when combined with milk/dairy products. 
Using the in vitro studies, it was shown that the combination of milk with honey had no effect on either the antibacterial or antioxidant capabilities of honey.	During the animal feeding studies a number of significant findings were observed. In the earlier work it was shown that honey had a significant effect on protein metabolism when fed for 14 days at a level of 600 g/kg diet (comprising 480 g sugars and 120 g water) compared with animals fed an equivalent amount of sucrose. In this study, honey-fed rats exhibited significantly lower weight gains (p less than 0.001), food intake (p less than 0.05) and nitrogen intakes (p less than 0.05) and significantly higher faecal nitrogen outputs (p less than 0.05) compared with sucrose-fed rats. Animals fed a diet consisting of 480 g/kg of mixed sugars as in honey generally exhibited protein metabolism parameters that were comparable to those of the sucrose-fed rats, suggesting that the effects of honey on protein metabolism were not due solely to its distinctive sugar composition.
	Furthermore, in another study that specifically investigated the effects of honey on weight regulation, honey (100 g/kg diet) resulted in significantly reduced weight gain after 6 weeks (p less than 0.01) compared with animals fed the same amount of sugars as sucrose, although food intake was not reduced in this study. Percentage weight gains were shown to be comparable between honey-fed rats and those fed a sugar-free diet, suggesting that differences in glycemic control may be partly responsible for the results seen. Fasting lipid profiles and blood glucose levels were also measured in this study, but no significant differences were observed between diet groups.
	During long-term (12 months) feeding weight gain was again significantly reduced in rats fed honey (p less than 0.05) and a sugar-free diet (p less than 0.01) compared with those fed sucrose, the weights of honey-fed rats and those fed the sugar-free diet being comparable at the end of the study. In addition, blood glucose levels were significantly lower (p less than 0.001), and HDL-cholesterol levels significantly higher (p less than 0.05) in animals fed honey compared with those fed sucrose after 52 weeks, but no differences in these parameters were observed between rats fed sucrose and a sugar-free diet. No other significant differences in lipid profiles were observed. Immunity measures were improved after feeding honey or sucrose for 52 weeks, animals in both of these diet groups having significantly higher levels of neutrophil phagocytosis compared with those fed the sugar-free diet (both p less than 0.0001). In addition, the percentage of leukocytes that were lymphocytes was significantly higher in honey-fed rats at the end of the study. Furthermore, levels of oxidative damage in aortic collagen were significantly reduced in rats fed honey or the sugar-free diet (both p less than 0.05) compared with those fed sucrose after 52 weeks.
	Full body DEXA scans were also undertaken in this 12-month study to assess body fat levels and bone mineral composition and density, although they revealed few statistically significant differences. Percentage body fat levels were shown to be nearly 10% lower in honey-fed rats compared with sucrose-fed animals at the end of the study (p less than 0.05), but no other significant differences between diet groups were observed. With one exception, no differences in bone mineral composition or bone mineral density were observed between the three diet groups after 52 weeks. This data agreed with the results generated from two earlier studies that showed that feeding honey short-term (for 6-8 weeks) to rats that were either calcium-deficient or fed a low calcium diet had no effect on bone calcium levels, bone mineral content, bone mineral density or bone breaking parameters.
	Lastly, long-term feeding of honey to rats had a number of statistically significant effects on anxiety and cognitive performance when assessed using animal maze tasks. Anxiety-like behaviour was significantly reduced in honey-fed rats overall compared with those fed sucrose (p = 0.056) or a sugar free diet (p less than 0.05). Spatial memory was also better in honey fed-rats throughout the 12 month study, these animals not displaying the same degree of age-related spatial memory loss seen in the other two diet groups. No significant differences in recognition memory or learning capability were observed between diet groups after 52 weeks.
	In conclusion, both short-term and long-term feeding of honey result in a number of health benefits compared with eating similar amounts of sucrose. These include less weight gain, improved immunity, reduced levels of oxidative damage and improved cognitive performance.. These effects of honey are likely to occur through a number of different processes, although the presence of high concentrations of antioxidants and other minor components in honey are likely to be important contributors. Honey may therefore help to improve human heath if it is used as an alternative to sucrose in foods and beverages, although feeding studies in humans are required to assess its efficacy. In addition, more animal studies are needed to assess which features of honey (e.g. fructose content, antioxidant content and bioactivities) are required to achieve optimal effects, and to determine what impact heating and food processing may have on the beneficial health effects of honey.

text: An Investigation of the Health Benefits of Honey as a Replacement For Sugar In the Diet Sugar (primarily sucrose) has been a part of the daily diet for literally hundreds of years, but research is now suggesting that sugar intake can be detrimental to our health. In particular, excessive consumption of simple sugars with high glycemic index (GI) values have been shown to cause overeating and weight gain. As well, elevated postprandial hyperglycemia can result after consuming sugars and this has been linked to disease formation and progression, the development of advanced glycation endproducts, inflammation and increased mortality rates. Honey has been recognised as having a number of beneficial health properties, including slower uptake into the bloodstream, a pharmacological action of reducing blood glucose levels and a high level of bioavailable antioxidants, all of which may mean that honey could be less harmful to health than sucrose in the diet. This study was therefore designed to investigate the health benefits of honey in the diet as a replacement for sucrose, using small animal studies. As well, because of the interest in using honey as a replacement for sucrose in sweetened dairy foods, a small number of in vitro investigations were carried out to determine whether honey could retain its bioactive properties when combined with milk/dairy products. 
Using the in vitro studies, it was shown that the combination of milk with honey had no effect on either the antibacterial or antioxidant capabilities of honey.	During the animal feeding studies a number of significant findings were observed. In the earlier work it was shown that honey had a significant effect on protein metabolism when fed for 14 days at a level of 600 g/kg diet (comprising 480 g sugars and 120 g water) compared with animals fed an equivalent amount of sucrose. In this study, honey-fed rats exhibited significantly lower weight gains (p less than 0.001), food intake (p less than 0.05) and nitrogen intakes (p less than 0.05) and significantly higher faecal nitrogen outputs (p less than 0.05) compared with sucrose-fed rats. Animals fed a diet consisting of 480 g/kg of mixed sugars as in honey generally exhibited protein metabolism parameters that were comparable to those of the sucrose-fed rats, suggesting that the effects of honey on protein metabolism were not due solely to its distinctive sugar composition.
	Furthermore, in another study that specifically investigated the effects of honey on weight regulation, honey (100 g/kg diet) resulted in significantly reduced weight gain after 6 weeks (p less than 0.01) compared with animals fed the same amount of sugars as sucrose, although food intake was not reduced in this study. Percentage weight gains were shown to be comparable between honey-fed rats and those fed a sugar-free diet, suggesting that differences in glycemic control may be partly responsible for the results seen. Fasting lipid profiles and blood glucose levels were also measured in this study, but no significant differences were observed between diet groups.
	During long-term (12 months) feeding weight gain was again significantly reduced in rats fed honey (p less than 0.05) and a sugar-free diet (p less than 0.01) compared with those fed sucrose, the weights of honey-fed rats and those fed the sugar-free diet being comparable at the end of the study. In addition, blood glucose levels were significantly lower (p less than 0.001), and HDL-cholesterol levels significantly higher (p less than 0.05) in animals fed honey compared with those fed sucrose after 52 weeks, but no differences in these parameters were observed between rats fed sucrose and a sugar-free diet. No other significant differences in lipid profiles were observed. Immunity measures were improved after feeding honey or sucrose for 52 weeks, animals in both of these diet groups having significantly higher levels of neutrophil phagocytosis compared with those fed the sugar-free diet (both p less than 0.0001). In addition, the percentage of leukocytes that were lymphocytes was significantly higher in honey-fed rats at the end of the study. Furthermore, levels of oxidative damage in aortic collagen were significantly reduced in rats fed honey or the sugar-free diet (both p less than 0.05) compared with those fed sucrose after 52 weeks.
	Full body DEXA scans were also undertaken in this 12-month study to assess body fat levels and bone mineral composition and density, although they revealed few statistically significant differences. Percentage body fat levels were shown to be nearly 10% lower in honey-fed rats compared with sucrose-fed animals at the end of the study (p less than 0.05), but no other significant differences between diet groups were observed. With one exception, no differences in bone mineral composition or bone mineral density were observed between the three diet groups after 52 weeks. This data agreed with the results generated from two earlier studies that showed that feeding honey short-term (for 6-8 weeks) to rats that were either calcium-deficient or fed a low calcium diet had no effect on bone calcium levels, bone mineral content, bone mineral density or bone breaking parameters.
	Lastly, long-term feeding of honey to rats had a number of statistically significant effects on anxiety and cognitive performance when assessed using animal maze tasks. Anxiety-like behaviour was significantly reduced in honey-fed rats overall compared with those fed sucrose (p = 0.056) or a sugar free diet (p less than 0.05). Spatial memory was also better in honey fed-rats throughout the 12 month study, these animals not displaying the same degree of age-related spatial memory loss seen in the other two diet groups. No significant differences in recognition memory or learning capability were observed between diet groups after 52 weeks.
	In conclusion, both short-term and long-term feeding of honey result in a number of health benefits compared with eating similar amounts of sucrose. These include less weight gain, improved immunity, reduced levels of oxidative damage and improved cognitive performance.. These effects of honey are likely to occur through a number of different processes, although the presence of high concentrations of antioxidants and other minor components in honey are likely to be important contributors. Honey may therefore help to improve human heath if it is used as an alternative to sucrose in foods and beverages, although feeding studies in humans are required to assess its efficacy. In addition, more animal studies are needed to assess which features of honey (e.g. fructose content, antioxidant content and bioactivities) are required to achieve optimal effects, and to determine what impact heating and food processing may have on the beneficial health effects of honey.

year: 2008

title: Demystifying a relationship between voluntary work and Māori

authors: Te Momo, Oliver Helena Fiona

abstract: The purpose of this thesis is to provide evidence that critically reviews the relationship between Māori and voluntary work in social service organisations. Since colonisation very little research has been initiated that investigated the involvement of Māori in voluntary activity yet recent statistics show that Māori are the highest participants in this type of work. This thesis provides an analysis of the relationship of Māori to voluntary work and its evolution in a Colonial State, Liberal State, Welfare State, and Neo-Liberal State in New Zealand. Three perspectives of Māori voluntary work provide the foundation for the analysis of this relationship. The first perspective describes voluntary work from a personal experience as an insider. The second perspective explores literature that records Māori involvement in voluntary activity. The third perspective documents life experiences from Māori voluntary workers in New Zealand communities. The three perspectives provide an empirical foundation for the type of relationship that has developed between Māori and voluntary work; Māori and the State; Māori and their place in New Zealand society. My interest in Te Ao Māori (the Māori world) as a valid and thriving ontological position and my academic interest in critical theory provide the theoretical lens for my analysis. 

Personal experience as a Māori volunteer opened doors to the communities I entered and added strength to the research, the first perspective. Western research in Māori communities often by non-Māori researchers, was conducted to gather knowledge for Western policy makers. Māori knowledge was not recognised as valid and the people were treated as objects. Knowing this, I searched for an approach that valued Māori participants, valued Māori people, and contained cultural aspects that separated the procedure from Western research. A review of literature, the second perspective, introduced a cultural approach to research termed kaupapa Māori research, generated out of and for Te Ao Māori detailed further in Chapter Three.

Participants’ life experiences coupled with literature provide a wealth of knowledge and a testimony to the type of relationship that exists between Māori and voluntary work. Criticism from Māori communities as to the exploitation of Māori volunteers has swelled in recent years so that the environment volunteers work in is no longer attractive to Māori people. Therefore, documenting the life experiences of Māori who participate in voluntary work as the primary source of information was imperative and produced evidence to describe the relationship between Māori and voluntary work in the thesis. A triangular study: case study, community study, and cross-section study (Chapters Six, Seven, and Eight), provide the ‘grass roots voices’ and represent the third perspective. 

My observation of Māori organisations’ involvement in voluntary work generated in me a deep concern in what appeared to be an involvement in activity that improved neither the lives of the volunteers nor the wider problems to which they attributed their aroha. This involvement activity is a product of historical developments whereby the Western ideology of voluntary work became confused with a Māori ideology of collective participation. This confusion has created an environment where Māori voluntary organisations are working unpaid with insufficient resources in oppressive conditions in the attempt to provide social solutions. I argue that the Māori ideology of collective participation has been co-opted in the emerging conflict of neo-liberalism to provide social services in communities which government agencies exploit. In conclusion, the thesis is a journey through the world of voluntary work for Māori in communal organisations.

text: Demystifying a relationship between voluntary work and Māori The purpose of this thesis is to provide evidence that critically reviews the relationship between Māori and voluntary work in social service organisations. Since colonisation very little research has been initiated that investigated the involvement of Māori in voluntary activity yet recent statistics show that Māori are the highest participants in this type of work. This thesis provides an analysis of the relationship of Māori to voluntary work and its evolution in a Colonial State, Liberal State, Welfare State, and Neo-Liberal State in New Zealand. Three perspectives of Māori voluntary work provide the foundation for the analysis of this relationship. The first perspective describes voluntary work from a personal experience as an insider. The second perspective explores literature that records Māori involvement in voluntary activity. The third perspective documents life experiences from Māori voluntary workers in New Zealand communities. The three perspectives provide an empirical foundation for the type of relationship that has developed between Māori and voluntary work; Māori and the State; Māori and their place in New Zealand society. My interest in Te Ao Māori (the Māori world) as a valid and thriving ontological position and my academic interest in critical theory provide the theoretical lens for my analysis. 

Personal experience as a Māori volunteer opened doors to the communities I entered and added strength to the research, the first perspective. Western research in Māori communities often by non-Māori researchers, was conducted to gather knowledge for Western policy makers. Māori knowledge was not recognised as valid and the people were treated as objects. Knowing this, I searched for an approach that valued Māori participants, valued Māori people, and contained cultural aspects that separated the procedure from Western research. A review of literature, the second perspective, introduced a cultural approach to research termed kaupapa Māori research, generated out of and for Te Ao Māori detailed further in Chapter Three.

Participants’ life experiences coupled with literature provide a wealth of knowledge and a testimony to the type of relationship that exists between Māori and voluntary work. Criticism from Māori communities as to the exploitation of Māori volunteers has swelled in recent years so that the environment volunteers work in is no longer attractive to Māori people. Therefore, documenting the life experiences of Māori who participate in voluntary work as the primary source of information was imperative and produced evidence to describe the relationship between Māori and voluntary work in the thesis. A triangular study: case study, community study, and cross-section study (Chapters Six, Seven, and Eight), provide the ‘grass roots voices’ and represent the third perspective. 

My observation of Māori organisations’ involvement in voluntary work generated in me a deep concern in what appeared to be an involvement in activity that improved neither the lives of the volunteers nor the wider problems to which they attributed their aroha. This involvement activity is a product of historical developments whereby the Western ideology of voluntary work became confused with a Māori ideology of collective participation. This confusion has created an environment where Māori voluntary organisations are working unpaid with insufficient resources in oppressive conditions in the attempt to provide social solutions. I argue that the Māori ideology of collective participation has been co-opted in the emerging conflict of neo-liberalism to provide social services in communities which government agencies exploit. In conclusion, the thesis is a journey through the world of voluntary work for Māori in communal organisations.

year: 2003