title: Clustering documents using a Wikipedia-based concept representation

authors: Huang, Anna

subjects: Machine learning

abstract: This paper shows how Wikipedia and the semantic knowledge it contains can be exploited for document clustering. We first create a concept-based document representation by mapping the terms and phrases within documents to their corresponding articles (or concepts) in Wikipedia. We also developed a similarity measure that evaluates the semantic relatedness between concept sets for two documents. We test the concept-based representation and the similarity measure on two standard text document datasets. Empirical results show that although further optimizations could be performed, our approach already improves upon related techniques.

text: Clustering documents using a Wikipedia-based concept representation This paper shows how Wikipedia and the semantic knowledge it contains can be exploited for document clustering. We first create a concept-based document representation by mapping the terms and phrases within documents to their corresponding articles (or concepts) in Wikipedia. We also developed a similarity measure that evaluates the semantic relatedness between concept sets for two documents. We test the concept-based representation and the similarity measure on two standard text document datasets. Empirical results show that although further optimizations could be performed, our approach already improves upon related techniques.

year: 2009

title: An Antarctic hot spot for Fungi at Shackleton's Historic Hut on Cape Royds

authors: Blanchette, Robert A.

subjects: Antarctic

abstract: The historic expedition huts located in the Ross Sea Region of the Antarctic and the thousands of artifacts left behind by the early explorers represent important cultural heritage from the “Heroic Era” of Polar exploration. The hut at Cape Royds built by Ernest Shackleton and members of the 1907–1908 British Antarctic Expedition has survived the extreme Antarctic environment for over 100 years, but recent studies have shown many forms of deterioration are causing serious problems, and microbial degradation is evident in the historic wood. Conservation work to reduce moisture at the hut required removal of fodder, wood, and many different types of organic materials from the stables area on the north side of the structure allowing large numbers of samples to be obtained for these investigations. In addition, wood from historic food storage boxes exposed in a ravine adjacent to the hut were also sampled. Fungi were cultured on several different media, and pure cultures were obtained and identified by sequencing of the internal transcribed spacer region of rDNA. From the 69 cultures of filamentous fungi obtained, the most predominant genera were Cadophora (44%) followed by Thielavia (17%) and Geomyces (15%). Other fungi found included Cladosporium, Chaetomium, and isolates identified as being in Pezizomycotina, Onygenales, Nectriaceae, and others. No filamentous basidiomycetes were found. Phylogenetic analyses of the Cadophora species showed great species diversity present revealing Cadophora malorum, Cadophora luteo-olivacea, Cadophora fastigiata, as well as Cadophora sp. 4E71-1, a C. malorum-like species, and Cadophora sp. 7R16-1, a C. fastigiata-like species. Scanning electron microscopy showed extensive decay was present in the wood samples with type 1 and type 2 forms of soft rot evident in pine and birch wood, respectively. Fungi causing decay in the historic wooden structures and artifacts are of great concern, and this investigation provides insight into the identity and species diversity of fungi found at the site. The historic woods and other organic materials at this site represent a large input of carbon into the Antarctic environment. This as well as nutrient additions from the nearby Adélie penguin (Pygoscelis adeliae) colony and favorable conditions for fungal growth at Cape Royds appear responsible for the significant fungal diversity, and where extensive decay is taking place in wood in contact with the ground.

text: An Antarctic hot spot for Fungi at Shackleton's Historic Hut on Cape Royds The historic expedition huts located in the Ross Sea Region of the Antarctic and the thousands of artifacts left behind by the early explorers represent important cultural heritage from the “Heroic Era” of Polar exploration. The hut at Cape Royds built by Ernest Shackleton and members of the 1907–1908 British Antarctic Expedition has survived the extreme Antarctic environment for over 100 years, but recent studies have shown many forms of deterioration are causing serious problems, and microbial degradation is evident in the historic wood. Conservation work to reduce moisture at the hut required removal of fodder, wood, and many different types of organic materials from the stables area on the north side of the structure allowing large numbers of samples to be obtained for these investigations. In addition, wood from historic food storage boxes exposed in a ravine adjacent to the hut were also sampled. Fungi were cultured on several different media, and pure cultures were obtained and identified by sequencing of the internal transcribed spacer region of rDNA. From the 69 cultures of filamentous fungi obtained, the most predominant genera were Cadophora (44%) followed by Thielavia (17%) and Geomyces (15%). Other fungi found included Cladosporium, Chaetomium, and isolates identified as being in Pezizomycotina, Onygenales, Nectriaceae, and others. No filamentous basidiomycetes were found. Phylogenetic analyses of the Cadophora species showed great species diversity present revealing Cadophora malorum, Cadophora luteo-olivacea, Cadophora fastigiata, as well as Cadophora sp. 4E71-1, a C. malorum-like species, and Cadophora sp. 7R16-1, a C. fastigiata-like species. Scanning electron microscopy showed extensive decay was present in the wood samples with type 1 and type 2 forms of soft rot evident in pine and birch wood, respectively. Fungi causing decay in the historic wooden structures and artifacts are of great concern, and this investigation provides insight into the identity and species diversity of fungi found at the site. The historic woods and other organic materials at this site represent a large input of carbon into the Antarctic environment. This as well as nutrient additions from the nearby Adélie penguin (Pygoscelis adeliae) colony and favorable conditions for fungal growth at Cape Royds appear responsible for the significant fungal diversity, and where extensive decay is taking place in wood in contact with the ground.

year: 2010

title: A Communitarian Approach to Accountability for the Common Good: A Case Study of Community Participation in Planning and Policy Making for Lake Taupo

authors: Arunachalam, Murugesh

subjects: accountability

abstract: This thesis seeks to gain a theoretical and empirical understanding of the meaning of a communitarian approach to accountability for the common good (CAACG). The hermeneutic analysis adopted in this study starts by explaining the researcher's pre-understandings which includes contemporary ideas on accountability, communitarianism and sustainability. A theoretical communitarian model was designed by synthesising these ideas. Using the theoretical model the researcher attempted to advance the meaning of CAACG in multiple contexts which include: the global context on sustainability; the New Zealand context on local governance; and more specifically in the context of planning and policy making for the sustainable development of the Taupo District. The use of such multiple contexts is crucial for this study. This is because communitarian ideology in New Zealand has historical roots in Local Government which, in recent years has been influenced by the global discourse on sustainable development. The adoption of multiple contexts is aimed at providing a holistic and historical understanding of planning and policy making processes in the Taupo District and the manifestation of CAACG in the processes.

In this interpretive study the term  text  is defined as the empirical data which consists of public documents, website material, minutes of community meetings, field notes and transcriptions of interviews. The empirical data is about processes and outcomes of collaboration between the community groups, public authorities and private entities in formulating strategies and policies for sustainable development of the Taupo District. Interpretation of the empirical data involved understanding the  text  from the vantage point of the pre-understandings of the interpreter. The interpretation of the  text  is is aimed at explaining the manifestation of CAACG in the Taupo District. The methodological orientations of the thesis are predominantly consistent with the hermeneutic tradition of Gadamer (1975). However, although the interpreter started with the intention of strictly confining to the subjectivist approach of Gadamer (1975), at times the hermeneutic methodology adopted by the researcher encroached into the methodological orientations of objectivist hermeneutics. The use of objectivist hermeneutic was inevitable as it was necessary to understand the authorial intention in the text before the interpreter understands the text from the perspective of his pre-understandings. Hence, the researcher rejects the assumption of objective-subjective dichotomy and subscribes more to the philosophical arguments advanced by contemporary scholars (such as Boland Jr, 1989 and Ricoeur, 1981) who find both the subjective and objective philosophies as necessary for interpreting texts. 

The hermeneutic analysis undertaken in this study suggests that the meaning of CAACG appears in the context of communal processes (including planning and policy making processes) and the strategies and policies formulated by the Taupo community. The meaning of CAACG may not be obvious to any reader of the  text . It arises from the interpretation of the  text  from the perspective of the interpreter's pre-understandings on a communitarian approach to accountability. The interpretation suggests the existence of a community of interests, community values and concerns, and communal processes in the Taupo District.  Community values and concerns are associated with Lake Taupo. The primary concern of the community is the pollution of Lake Taupo caused by animal farming in the land surrounding the lake and the impact the pollution has on the environmental, economic and cultural values of the community. The communal processes involved collaboration between the community and public authorities in planning and policy making for the protection of Lake Taupo. The interpretation also indicates the manifestation of several dimensions of accountability in the communal processes; joint accountability or 360 degree accountability in the Taupo District; and the holistic meaning of environmental and social accounting.

In the Taupo District the operation of the CAACG can be affected by several factors. Symmetry of power can be affected in terms of the preferential treatment given to the indigenous community and its segregation from the rest of the community. The strong influence of local authorities in the planning and decision making processes makes the community appear helpless without the local authorities. Communitarian processes intended to empower the community may actually strengthen the position of local authorities. Power has actually shifted from Central Government to local authorities and may not necessarily have shifted to communities. However, the endeavours to engage the community in the Taupo District can be seen as attempts to build the capacity of the community to participate in the processes and time will tell how effective the CAACG will prove to be.

This thesis is the pioneer in advancing the theorization of the CAACG and has added a substantial contribution to accountability literature. It suggests a new way of looking at environmental and social accounting in which the emphasis is on community involvement through reporting and deliberation (dialectical dimension of accountability) on the impacts of human activities on the natural environment. The CAACG is premised on the centrality of community and the assumption of a 360 degree accountability in which everyone in the community has mutual responsibility to protect the common good and can be subject to critical enquiry for the adverse impacts of their activities on the common good. The CAACG does not accord private corporations the privilege status of  reporting entities  but considers environmental and social accounting as the agenda of the community. 

The concept of CAACG is not utopian as it may sound to some readers of this thesis. There are ample evidence of communities throughout the world demanding a voice in statutory planning and decision making for sustainable development. The increasing focus on environmental sustainability and community participation in the planning and decision making processes arises from greater awareness of the detrimental impacts of environmental pollution and the realisation that the decision on the common good cannot be left to free market forces and private corporations. The natural environment belongs to a community of interests which wants to participate in joint responsibility and collective planning and decision making. No individual or group has the right to make decisions about the natural environment without consulting the community.

text: A Communitarian Approach to Accountability for the Common Good: A Case Study of Community Participation in Planning and Policy Making for Lake Taupo This thesis seeks to gain a theoretical and empirical understanding of the meaning of a communitarian approach to accountability for the common good (CAACG). The hermeneutic analysis adopted in this study starts by explaining the researcher's pre-understandings which includes contemporary ideas on accountability, communitarianism and sustainability. A theoretical communitarian model was designed by synthesising these ideas. Using the theoretical model the researcher attempted to advance the meaning of CAACG in multiple contexts which include: the global context on sustainability; the New Zealand context on local governance; and more specifically in the context of planning and policy making for the sustainable development of the Taupo District. The use of such multiple contexts is crucial for this study. This is because communitarian ideology in New Zealand has historical roots in Local Government which, in recent years has been influenced by the global discourse on sustainable development. The adoption of multiple contexts is aimed at providing a holistic and historical understanding of planning and policy making processes in the Taupo District and the manifestation of CAACG in the processes.

In this interpretive study the term  text  is defined as the empirical data which consists of public documents, website material, minutes of community meetings, field notes and transcriptions of interviews. The empirical data is about processes and outcomes of collaboration between the community groups, public authorities and private entities in formulating strategies and policies for sustainable development of the Taupo District. Interpretation of the empirical data involved understanding the  text  from the vantage point of the pre-understandings of the interpreter. The interpretation of the  text  is is aimed at explaining the manifestation of CAACG in the Taupo District. The methodological orientations of the thesis are predominantly consistent with the hermeneutic tradition of Gadamer (1975). However, although the interpreter started with the intention of strictly confining to the subjectivist approach of Gadamer (1975), at times the hermeneutic methodology adopted by the researcher encroached into the methodological orientations of objectivist hermeneutics. The use of objectivist hermeneutic was inevitable as it was necessary to understand the authorial intention in the text before the interpreter understands the text from the perspective of his pre-understandings. Hence, the researcher rejects the assumption of objective-subjective dichotomy and subscribes more to the philosophical arguments advanced by contemporary scholars (such as Boland Jr, 1989 and Ricoeur, 1981) who find both the subjective and objective philosophies as necessary for interpreting texts. 

The hermeneutic analysis undertaken in this study suggests that the meaning of CAACG appears in the context of communal processes (including planning and policy making processes) and the strategies and policies formulated by the Taupo community. The meaning of CAACG may not be obvious to any reader of the  text . It arises from the interpretation of the  text  from the perspective of the interpreter's pre-understandings on a communitarian approach to accountability. The interpretation suggests the existence of a community of interests, community values and concerns, and communal processes in the Taupo District.  Community values and concerns are associated with Lake Taupo. The primary concern of the community is the pollution of Lake Taupo caused by animal farming in the land surrounding the lake and the impact the pollution has on the environmental, economic and cultural values of the community. The communal processes involved collaboration between the community and public authorities in planning and policy making for the protection of Lake Taupo. The interpretation also indicates the manifestation of several dimensions of accountability in the communal processes; joint accountability or 360 degree accountability in the Taupo District; and the holistic meaning of environmental and social accounting.

In the Taupo District the operation of the CAACG can be affected by several factors. Symmetry of power can be affected in terms of the preferential treatment given to the indigenous community and its segregation from the rest of the community. The strong influence of local authorities in the planning and decision making processes makes the community appear helpless without the local authorities. Communitarian processes intended to empower the community may actually strengthen the position of local authorities. Power has actually shifted from Central Government to local authorities and may not necessarily have shifted to communities. However, the endeavours to engage the community in the Taupo District can be seen as attempts to build the capacity of the community to participate in the processes and time will tell how effective the CAACG will prove to be.

This thesis is the pioneer in advancing the theorization of the CAACG and has added a substantial contribution to accountability literature. It suggests a new way of looking at environmental and social accounting in which the emphasis is on community involvement through reporting and deliberation (dialectical dimension of accountability) on the impacts of human activities on the natural environment. The CAACG is premised on the centrality of community and the assumption of a 360 degree accountability in which everyone in the community has mutual responsibility to protect the common good and can be subject to critical enquiry for the adverse impacts of their activities on the common good. The CAACG does not accord private corporations the privilege status of  reporting entities  but considers environmental and social accounting as the agenda of the community. 

The concept of CAACG is not utopian as it may sound to some readers of this thesis. There are ample evidence of communities throughout the world demanding a voice in statutory planning and decision making for sustainable development. The increasing focus on environmental sustainability and community participation in the planning and decision making processes arises from greater awareness of the detrimental impacts of environmental pollution and the realisation that the decision on the common good cannot be left to free market forces and private corporations. The natural environment belongs to a community of interests which wants to participate in joint responsibility and collective planning and decision making. No individual or group has the right to make decisions about the natural environment without consulting the community.

year: 2010