A/Prof Charl RAS

Associate Professor

School of Mathematics and Statistics

  • Room: 141
  • Building: Peter Hall Building
  • Campus: Parkville

Research Interests

  • Combinatorial optimisation
  • Discrete and computational geometry
  • Shortest network design
  • Survivable networks

Research Groups

Publications, Grants and Awards

You can find all publications, grants and awards on their Find an Expert page.

Find an Expert

Extra Information

My research primarily involves the use of techniques from graph theory, optimisation, and computational geometry for designing networks that are minimal under various edge-length objectives. I am interested in the design and asymptotic analysis of geometric network optimisation algorithms, including aspects such as computational complexity, fixed-parameter tractability, and NP-completeness. Some of the applications of my work are the optimisation of energy consumption in wireless ad-hoc networks, VLSI design, and phylogenetic tree construction. One of my current projects seeks to find mathematical tools and algorithms for the deployment and augmentation of optimal survivable networks. In this problem one is required to introduce a set of nodes and links into a geometric space so that the resultant network is multi-connected and is optimal with respect to some objective (for instance the sum of all edge-lengths). Finding good solutions to this problem will contribute to the economical construction of robust infrastructure and telecommunications networks, including transportation networks, utility networks, and fibre-optic networks such as the NBN.

Current Postgraduate Supervision

Name Thesis title
Jae Myeong LEE
Adalberto SATO MICHELS "Assembly line balancing problem with heterogeneous resources"

Past Postgraduate Supervision

Name Thesis title
Patrick ANDERSEN "Degree bounded geometric spanning trees with a bottleneck objective function"
Sanath KAHAGALAGE "A study of optimised network flows for prediction of force transmission and crack propagation in bonded granular media"

Past Honours & MSc Students

Name Project title
Jae Myeong LEE "Heuristics for designing resilient networks in earthquake prone environments"
Alexandra SIMPSON "A Graph Theoretic Approach to Maximising Wireless Network Lifetime"
Billy TANG "Preprocessing heuristics for integer programming formulations of an ad hoc wireless network"
Ashild TELLE "Algorithms for mapping vertices and edges to a polyhedral decomposition"
Aashima THUKRAL "Optimal design of survivable wireless networks under regional failure"
Mark TURNER "The Variable-cost Node-weighted Steiner Tree Problem in the Euclidean Plane"
Daniel UTEDA "Min-power clustering in ad-hoc wireless sensor networks"
Yunhe YANG "Regional disaster and regional min-cut max-flow problem in networks"
Cameron YOUNG "On augmenting the survivability of geometric graphs with respect to regional connectivity"


  • Exchange Student Advisor/Evaluator