Sökning: "term weighting"

Visar resultat 1 - 5 av 28 avhandlingar innehållade orden term weighting.

1. 1. With or without context : Automatic text categorization using semantic kernels

   Författare :Johan Eklund; Högskolan i Borås; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; automatic text categorization; subject classification; machine learning; computational linguistics; support vector machines; semantic kernels; term weighting; divergence from randomness; Library and Information Science; Biblioteks- och informationsvetenskap;

   Sammanfattning : In this thesis text categorization is investigated in four dimensions of analysis: theoretically as well as empirically, and as a manual as well as a machine-based process. In the first four chapters we look at the theoretical foundation of subject classification of text documents, with a certain focus on classification as a procedure for organizing documents in libraries. LÄS MER

3. 2. Framework For Structuring Information For Environmental Management Of Industrial Systems

   Författare :Raul Carlson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Life cycle assessment LCA ; data format; characterisation; weighting; information structuring; Design for Environment DfE ; indicator; sustainable development; industrial environmental information systems; database;

   Sammanfattning : This thesis addresses information structuring for reducing cost, facilitate understandability, increase relevance and improve quality of environmental information. The research is based in experience, practical results and syntheses from three different but related research and development projects conducted between 1994 and 2004. LÄS MER

4. 3. Long-term Environmental Problems, Economic Measures and Physical Indicators

   Författare :Christian Azar; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; stability analysis; discounting; environmental debt; sustainability; intergenerational; weight factors; population dynamics; the greenhouse effect; economics; indicators;

   Sammanfattning : This thesis consists of five papers and an introduction dealing with various aspects of the use of environmental resources. In both Paper I, The marginal cost of CO2 emissions, and Paper II, Discounting and distributional considerations in the context of global warming, we analyse the economics of the greenhouse effect. LÄS MER

5. 4. Konvertering av direkteluppvärmda flerbostadsområden-Beslutsunderlag och drivkrafter

   Författare :Magnus Stjerndahl; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; weighting methods; residential buildings; energy efficiency; environmental assessment; direct-acting electric heating; incentives; heat supply; heating systems; life cycle cost LCC ; life cycle assessment LCA ; decision making;

   Sammanfattning : The Swedish society is interested in reducing the use of electricity and especially electricity for heating purposes. For this purpose governmental subsidies have been introduced to support a change from electric heating to other types of heat supply systems. Owners of single and multifamily buildings can apply for the investment subsidy. LÄS MER

7. 5. Long-term follow-up after surgery for chronic thromboembolic pulmonary hypertension

   Författare :Janica Kallonen; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :;

   Sammanfattning : Background: Pulmonary endarterectomy (PEA) is the treatment recommended for all operable patients with chronic thromboembolic pulmonary hypertension (CTEPH). The aim of this thesis was to evaluate long-term survival, quality of life (QoL) and functional status in patients with CTEPH who have undergone PEA. LÄS MER