Inaugural-Dissertation zur Erlangung des Doktorgrades der

While mobility in the sense of node movement has been an intensively studied aspect of mobile ad-hoc networks (MANETs), another aspect of mobility has not yet been subjected to systematic research: nodes may not only move around but also enter and leave the network. In fact, many proposed protocols for MANETs exhibit worst-case behavior when an intended communication partner is currently not present. This thesis addresses the problem of detecting the presence of nodes in MANETs and provides lightweight solutions to the problem. As our major contribution, we introduce soft-state presence detection. It uses a Bloom filter-based beaconing mechanism to aggregate and distribute information about the presence of network nodes. This soft-state approach decays information over time, enabling the removal of no-longer-present nodes from aggregates, which is not possible with standard Bloom filter operations. Privacy issues and design alternatives of this approach are also discussed. While being a lightweight presence detection, the soft-state approach provides an additiona

Tag der mündlichen Prüfung: 7. Juli 2009To my familyTable of contents TABLE OF CONTENTS

Cortical gene expression profiling in spinal cord repair: insight into the complexity of the neural regeneratio

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Secondary metabolites from marine sponges, with focus on the chemical ecology and biochemical characterisation of the stress-induced biotransformation of Aplysina alkaloids Sekundärmetabolite mariner Schwämme, mit Schwerpunkt auf der chemischen Ökologie und biochemischen Charakterisierung de

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In-line monitoring of granule moisture in fluidized bed granulators using microwave resonance technology as novel PAT tool Inaugural-Dissertation zur Erlangung des Doktorgrade