Inhalt

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   Dedication
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   Abstract
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   Zusammenfassung
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   Acknowledgments
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   Contents
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   List of Figures
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   List of Tables
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   Listings
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  1 Introduction
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  1.1 Motivation and Problem
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   1.1.1 Research Motivation
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   1.1.2 Problem
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   1.2 Research Questions and Hypothesis
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   1.3 Research Approach
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   1.4 Contribution and Relevance
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   1.5 Thesis Outline
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  2 Trust: Background and Characterization
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  2.1 Trust: A Multidisciplinary Overview
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   2.1.1 Trustworthiness and Credibility
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   2.1.2 Trust, a sociological, psychological and philosophical perspective
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   2.1.3 Trust, an economics perspective
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   2.1.4 Trust in computer science
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   2.1.5 Ontologies of trust
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   2.2 Provenance
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   2.3 The Sensor Web and Volunteered Geographic Information
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   2.4 Discussion & Conclusions
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  3 Trust as a Proxy Measure for Observation Quality Assessment
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  3.1 Conclusions on Trust
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   3.1.1 Trust is Contextualized
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   3.1.2 Spatial Aspects of Trust
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   3.1.3 Temporal Aspects of Trust
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   3.2 Reputation and Trustworthiness
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   3.3 Informational Trust
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   3.4 Spatial-Temporal Trust Models for Assessment of Observation Quality
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   3.5 Conclusions
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  4 Ontology of Trust & Reputation for Observation Quality Assessment
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   4.1 Motivating Scenario: A Human Sensor Web for Water Availability Monitoring
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   4.2 The Foundational Ontology DOLCE
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   4.3 Functional Ontology of Observation and Measurement
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  4.4 Trust and Reputation Models for VGI: An Ontological Perspective
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   4.4.1 Formalizing Trust and Reputation in the FOOM Ontology
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   4.4.2 Implementation of the WSMS in the FOOM Ontology
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   4.5 Conclusions
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  5 A Temporal Trust & Reputation Model for Human Sensors
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   5.1 Model Description
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   5.1.1 Computational Model Description
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   5.1.2 WSMS Dynamics: Initialization & Model Operation
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  5.2 Overview: WSMS Simulation Model
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   5.2.1 Agent Based Modelling
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   5.2.2 Agent Based Modelling
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   5.3 Experimental Design and Base Runs
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  5.4 Model Performance Measures
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   5.4.1 Model precision
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   5.4.2 Model latency
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   5.5 Model Evaluation Analysis
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   5.5.1 Experimental Setup
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   5.5.2 Model Parameter Interactions
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   5.5.3 Optimization of Model Adaptation Measure
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   5.5.4 Optimization of Model Latency Measure
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   5.5.5 Effects of the Time Decay of Trust on Model Performance
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   5.5.6 The Model Precision-Latency Relation
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   5.5.7 The Effect of Volunteer Populations on Model Precision
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   5.6 Conclusions
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  6 A Spatial-Temporal Trust & Reputation Model For Human Sensors
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   6.1 Motivating Scenario: Extensions of the WSMS
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  6.2 Model Description
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   6.2.1 Conceptual Model Description
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   6.2.2 Computational Model Description
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   6.2.3 Extended WSMS Dynamics: Initialization & Model Operation
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   6.3 Overview: Extended WSMS Simulation Model
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   6.4 Effects of Space on the Model Performance
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   6.5 Conclusions
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  7 Conclusions & Future Work
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   7.1 Summary & Discussion
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   7.2 Benefits & Future Work
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   Bibliography
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   Declaration