title: Predicting polycyclic aromatic hydrocarbon concentrations in soil and water samples

authors: Holmes, Geoffrey

subjects: computer science

abstract: Polycyclic Aromatic Hydrocarbons (PAHs) are compounds found in the environment that can be harmful to humans. They are typically formed due to incomplete combustion and as such remain after burning coal, oil, petrol, diesel, wood, household waste and so forth. Testing laboratories routinely screen soil and water samples taken from potentially contaminated sites for PAHs using Gas Chromatography Mass Spectrometry (GC-MS). A GC-MS device produces a chromatogram which is processed by an analyst to determine the concentrations of PAH compounds of interest. In this paper we investigate the application of data mining techniques to PAH chromatograms in order to provide reliable prediction of compound concentrations. A workflow engine with an easy-to-use graphical user interface is at the heart of processing the data. This engine allows a domain expert to set up workflows that can load the data, preprocess it in parallel in various ways and convert it into data suitable for data mining toolkits. The generated output can then be evaluated using different data mining techniques, to determine the impact of preprocessing steps on the performance of the generated models and for picking the best approach. Encouraging results for predicting PAH compound concentrations, in terms of correlation coefficients and root-mean-squared error are demonstrated.

text: Predicting polycyclic aromatic hydrocarbon concentrations in soil and water samples Polycyclic Aromatic Hydrocarbons (PAHs) are compounds found in the environment that can be harmful to humans. They are typically formed due to incomplete combustion and as such remain after burning coal, oil, petrol, diesel, wood, household waste and so forth. Testing laboratories routinely screen soil and water samples taken from potentially contaminated sites for PAHs using Gas Chromatography Mass Spectrometry (GC-MS). A GC-MS device produces a chromatogram which is processed by an analyst to determine the concentrations of PAH compounds of interest. In this paper we investigate the application of data mining techniques to PAH chromatograms in order to provide reliable prediction of compound concentrations. A workflow engine with an easy-to-use graphical user interface is at the heart of processing the data. This engine allows a domain expert to set up workflows that can load the data, preprocess it in parallel in various ways and convert it into data suitable for data mining toolkits. The generated output can then be evaluated using different data mining techniques, to determine the impact of preprocessing steps on the performance of the generated models and for picking the best approach. Encouraging results for predicting PAH compound concentrations, in terms of correlation coefficients and root-mean-squared error are demonstrated.

year: 2010

title: Sustainable livelihood development: A case study measuring social capital and its role in sustainable livelihood development in Zoucheng, China

authors: Liu, Shaoyong

subjects: sustainable livleihood development

abstract: This thesis is to discover whether the strength of social capital can alter household livelihoods and their sustainability. The intention of this thesis is to answer two questions: (1) Can different types of social ties (kin and non-kin ties) lead to differential access to social capital in a small community in China？(2) Does the strength of social capital alter local livelihood patterns by diversifying household livelihoods, or producing new livelihoods in an industry that has potential for development? 
This thesis, using a quantitative methodology, focuses on social capital measures. It begins with data collection on the social capital status and livelihoods of mining households. The household survey used a random recruitment for sample selection, which involved 228 participants in mines and related working departments (e.g. electricity, and the corporate headquarters of the local biggest mining company) in Zoucheng city, Shandong Province, China. OLS regression models used the household survey to generate associations of variables, such as human capital resources for respondents, length and location of residency, access to social networks, etc. with the composite measure of access to social capital. With these analyses and background information about Zoucheng, I use a simulation model to project the alternative livelihoods for local rural households based on local resources (e.g. farmland, tourism, and mineral resources). The aim of the simulation model was to better understand the role that social capital might play in possible transitions to alternative livelihoods (namely, tourism and farming).

The research results argue that both kin ties and weak ties (such as friendships) are important factors associated with social capital for mining sector residents in Zoucheng (Chapter Six). The advantages of strengthened social capital are presented in the simulation model (Chapter Eight). As social capital was enhanced, both incomes and number of rural tourism operators increased. These results have implications for governmental policy regarding livelihood strategy diversification and poverty alleviation. An understanding of these concepts may play a role in assisting emerging economies to be resilient at local levels and better equipped to withstand exogenous shocks in certain cultural contexts (e.g. Confucian society).

text: Sustainable livelihood development: A case study measuring social capital and its role in sustainable livelihood development in Zoucheng, China This thesis is to discover whether the strength of social capital can alter household livelihoods and their sustainability. The intention of this thesis is to answer two questions: (1) Can different types of social ties (kin and non-kin ties) lead to differential access to social capital in a small community in China？(2) Does the strength of social capital alter local livelihood patterns by diversifying household livelihoods, or producing new livelihoods in an industry that has potential for development? 
This thesis, using a quantitative methodology, focuses on social capital measures. It begins with data collection on the social capital status and livelihoods of mining households. The household survey used a random recruitment for sample selection, which involved 228 participants in mines and related working departments (e.g. electricity, and the corporate headquarters of the local biggest mining company) in Zoucheng city, Shandong Province, China. OLS regression models used the household survey to generate associations of variables, such as human capital resources for respondents, length and location of residency, access to social networks, etc. with the composite measure of access to social capital. With these analyses and background information about Zoucheng, I use a simulation model to project the alternative livelihoods for local rural households based on local resources (e.g. farmland, tourism, and mineral resources). The aim of the simulation model was to better understand the role that social capital might play in possible transitions to alternative livelihoods (namely, tourism and farming).

The research results argue that both kin ties and weak ties (such as friendships) are important factors associated with social capital for mining sector residents in Zoucheng (Chapter Six). The advantages of strengthened social capital are presented in the simulation model (Chapter Eight). As social capital was enhanced, both incomes and number of rural tourism operators increased. These results have implications for governmental policy regarding livelihood strategy diversification and poverty alleviation. An understanding of these concepts may play a role in assisting emerging economies to be resilient at local levels and better equipped to withstand exogenous shocks in certain cultural contexts (e.g. Confucian society).

year: 2017

title: Commentary on 'Family obligations in Micronesian cultures: implications for educators'

authors: Bishop, Russell

subjects: education

abstract: The paper makes some interesting observations about the need for educators to understand the cultural positionings of Micronesian students and by implication challenges readers to extend these understandings to other migrant and minoritised student groups. I would like to take up this challenge and illustrate how useful it is to theorise from a relational discourse when seeking solutions to what many educators are suggesting as the greatest problem we face in contemporary education, i.e. the seemingly immutable and growing educational disparities that accompany the increasing diversity of our student bodies in association with the continuing dominance of monocultural and deficit explanations by teachers about the causes of the disparities. This problem negatively affects indigenous students and students of colour along with migrant students and the paper rightly points to the need for solutions.

text: Commentary on 'Family obligations in Micronesian cultures: implications for educators' The paper makes some interesting observations about the need for educators to understand the cultural positionings of Micronesian students and by implication challenges readers to extend these understandings to other migrant and minoritised student groups. I would like to take up this challenge and illustrate how useful it is to theorise from a relational discourse when seeking solutions to what many educators are suggesting as the greatest problem we face in contemporary education, i.e. the seemingly immutable and growing educational disparities that accompany the increasing diversity of our student bodies in association with the continuing dominance of monocultural and deficit explanations by teachers about the causes of the disparities. This problem negatively affects indigenous students and students of colour along with migrant students and the paper rightly points to the need for solutions.

year: 2010