of PhD dissertation Hans Friedrich Witschel When compared to traditional centralised solutions for document storage and retrieval, peerto-peer (P2P) systems offer a number of potential advantages. For instance, they offer greater ease of publishing and significantly reduce maintenance costs and risk of failure. However, in order to become really attractive, peer-to-peer text retrieval systems m...

This paper evaluates four forwarding strategies for fragmented datagrams in the Internet of Things (IoT). We focus on classic end-to-end fragmentation, hop-wise reassembly, a minimal approach to direct fragments, and utilizing selective fragment recovery. To fully analyze potentials recovery, we include common congestion control mechanisms. compare all fragmentation comprehensively extensive ex...

Two-layer hierarchy unstructured peer-to-peer (P2P) systems, comprising an upper layer of super-peers and an underlying layer of ordinary peers, are commonly used to improve the performance of large-scale P2P systems. However, the optimal super-peer network design involves several requirements including super-peer degree, network diameter, scalability, load balancing, and flooding performance. ...