5 papers
Designing Capacitated Subnetworks for Shortest Path Routing
Markus Chimani, Max Ilsen
In pursuit of higher energy efficiency in computer networks, one subfield of green traffic engineering aims at reducing the size of a network during times of low traffic, while sti…
No Traffic to Cry: Traffic-Oblivious Link Deactivation for Green Traffic Engineering
Max Ilsen, Daniel Otten, Nils Aschenbruck +1
As internet traffic grows, the underlying infrastructure consumes increasing amounts of energy. During off-peak hours, large parts of the networks remain underutilized, presenting…
The Price of Upwardness
Patrizio Angelini, Therese Biedl, Markus Chimani +8
Not every directed acyclic graph (DAG) whose underlying undirected graph is planar admits an upward planar drawing. We are interested in pushing the notion of upward drawings beyon…
Simple Approximations for General Spanner Problems
Fritz Bökler, Markus Chimani, Henning Jasper
Consider a graph with n nodes and m edges, independent edge weights and lengths, and arbitrary distance demands for node pairs. The spanner problem asks for a minimum-weight subgra…
Two-edge-connected (not necessarily spanning) subgraphs and polyhedra
Justus Bruckamp, Markus Chimani, Martina Juhnke
Given a graph , we study the -edge-connected subgraph polytope , which is given by the convex hull of the incidence vectors of all -edge-connected subgr…