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Bergbau und Umsiedlungen im Mitteldeutschen Braunkohlenrevier - mit diesem Titel erscheint erstmals ein Kompendium, das einem durchaus schwierigen Kapitel unserer Regionalgeschichte gewidmet ist. Seit 1925 gingen im Raum zwischen Gräfenhainichen, Bitterfeld, Delitzsch, Leipzig, Borna, Altenburg, Zeitz, dem Geiseltal, Halle und Nachterstedt insgesamt 140 Ortslagen ganz oder teilweise verloren, wovon rund 53.000 Menschen betroffen waren. Mit dem nunmehr anstehenden Strukturwandel und dem Ausstieg aus der Braunkohlenverstromung hierzulande bis 2035 ist es Zeit für eine "abschließende Bilanz". Das Buch geht von einer Einführung aus, die den Bogen von der Raumordnung über die Siedlungsentwicklung im Wandel der Zeiten bis zur Sozialverträglichkeit spannt und dabei auch Exkurse ins Rheinland, in die Lausitz, nach Helmstedt und in die Oberpfalz beinhaltet. Daran schließen sich die auf umfangreiches Karten- und Bildmaterial gestützten Detaildarstellungen zu den Tagebauentwicklungen und zu den "Verlorenen Orten" an. Ergänzt werden diese durch "Themenspecials", deren Bandbreite von Zeitzeugeninterviews über Analysen historischer Dokumente bis zu "Denkwürdigkeiten" vor Ort reicht. Herausgeber ist die Kulturstiftung Hohenmölsen, die selbst auf die 1998 abgeschlossene Umsiedlung der Gemeinde Großgrimma zurückgeht. Prof. Dr. Andreas Berkner als langjähriger Kenner der Bergbau- und Landschaftsentwicklung im Revier übernahm die Schriftleitung und damit die Koordination in einem umfassenden Netzwerk engagierter Heimatforscher, Betroffener, Bergleute und Wissenschaftler.

Recent control plane solutions in a software-defined network (SDN) setting assume physically distributed but logically centralized control instances: a distributed control plane (DCP). As networks become more heterogeneous with increasing amount and diversity of network resources, DCP deployment strategies must be both fast and flexible to cope with varying network conditions whilst fulfilling constraints. However, many approaches are too slow for practical applications and often address only bandwidth or delay constraints, while control-plane reliability is overlooked and control-traffic routability is not guaranteed. We demonstrate the capabilities of our optimization framework [1]-[3] for fast deployment of DCPs, guaranteeing routability in line with control service reliability, bandwidth and latency requirements. We show that our approach produces robust deployment plans under changing network conditions. Compared to state of the art solvers, our approach is magnitudes faster, enabling deployment of DCPs within minutes and seconds, rather than days and hours., QC 20210906

5G promises to usher in the industrial 4.0 era. In that era, intricately managed autonomous industrial sites with for example remotely controller equipment and autonomous units promise previously unseen levels of efficiency. Although such scenarios are elusive, they come with strict long-since established safety requirements. To uphold such requirements, intelligent industrial 5G networks, that actively take into account prevailing conditions and dynamics of the workers on the site, the equipment, and the network, are needed. Little is known about the dynamics of actual industrial 5G networks and the interplay between network performance and QoE. In this paper, as a step towards intelligent industrial 5G networks, we measure network performance for an industrial 5G network, and conduct QoE experiments with remote controlled industrial equipment on an operational site. The results revealed unexpected relationships between QoE and network performance that shows how important domain-specific knowledge is when researching intelligent industrial 5G networks.

In this paper we present Metron, a Network Functions Virtualization (NFV) platform that achieves high resource utilization by jointly exploiting the underlying network and commodity servers’ resources. This synergy allows Metron to: (i) offload part of the packet processing logic to the network, (ii) use smart tagging to setup and exploit the affinity of traffic classes, and (iii) use tag-based hardware dispatching to carry out the remaining packet processing at the speed of the servers’ fastest cache(s), with zero intercore communication. Metron also introduces a novel resource allocation scheme that minimizes the resource allocation overhead for large-scale NFV deployments. With commodity hardware assistance, Metron deeply inspects traffic at 40 Gbps and realizes stateful network functions at the speed of a 100 GbE network card on a single server. Metron has 2.75-6.5x better efficiency than OpenBox, a state of the art NFV system, while ensuring key requirements such as elasticity, fine-grained load balancing, and flexible traffic steering, QC 20200324

We propose a novel distributed leader election algorithm to deal with the controller and control service availability issues in programmable networks, such as Software Defined Networks (SDN) or programmable Radio Access Network (RAN). Our approach can deal with a wide range of network failures, especially intermittent network partitions, where splitting and merging of a network repeatedly occur. In contrast to traditional leader election algorithms that mainly focus on the (eventual) consensus on one leader, the proposed algorithm aims at optimizing control service availability, stability and reducing the controller state synchronization effort during intermittent network partitioning situations. To this end, we design a new framework that enables dynamic leader election based on real-time estimates acquired from statistical monitoring. With this framework, the proposed leader election algorithm has the capability of being flexibly configured to achieve different optimization objectives, while adapting to various failure patterns. Compared with two existing algorithms, our approach can significantly reduce the synchronization overhead (up to 12x) due to controller state updates, and maintain up to twice more nodes under a controller., QC 20211025