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- Luís Gouveia, Mario Ruthmair
- Computers & OR
- 2015

We address the one-to-one multi-commodity pickup and delivery traveling salesman problem (m-PDTSP) which is a generalization of the TSP and arises in several transportation and logistics applications. The objective is to find a minimum-cost directed Hamiltonian path which starts and ends at given depot nodes and such that the demand of each given commodity… (More)

- Mario Ruthmair, Günther R. Raidl
- EUROCAST
- 2009

The rooted delay-constrained minimum spanning tree problem is an NP-hard combinatorial optimization problem arising for example in the design of centralized broadcasting networks where quality of service constraints are of concern. We present a construction heuristic based on Kruskal's algorithm for finding a minimum cost spanning tree which eliminates some… (More)

- Mario Ruthmair, Günther R. Raidl
- IPCO
- 2011

We present a layered graph model for delay-constrained minimum tree problems with a polynomial number of constraints which can be solved well for instances with low-to medium-sized sets of achievable delay values and not too high bounds. Layered graph models have been recently shown to frequently yield tight bounds in the context of hop-or delay-constrained… (More)

- Mario Ruthmair, Günther R. Raidl
- PPSN
- 2010

The rooted delay-constrained minimum spanning tree problem is an NP-hard combinatorial optimization problem arising for example in the design of centralized broadcasting networks where quality of service constraints are of concern. We present two new approaches to solve this problem heuristically following the concepts of ant colony optimization (ACO) and… (More)

- Markus Leitner, Mario Ruthmair, Günther R. Raidl
- INOC
- 2011

We consider the rooted delay-constrained Steiner tree problem which arises for example in the design of centralized multicasting networks where quality of service constraints are of concern. We present a mixed integer linear programming formulation based on the concept of feasible paths which has already been considered in the literature for the spanning… (More)

- Thorsten Krenek, Mario Ruthmair, Günther R. Raidl, Michael Planer
- EvoApplications
- 2012

This work deals with the application of metaheuristics to the fuel consumption minimization problem of hybrid electric vehicles (HEV) considering exactly specified driving cycles. A genetic algorithm, a downhill-simplex method and an algorithm based on swarm intelligence are used to find appropriate parameter values aiming at fuel consumption minimization.… (More)

We consider the rooted delay-constrained Steiner tree problem which arises for example in the design of centralized multicasting networks where quality of service constraints are of concern. We present a path based integer linear programming formulation which has already been considered in the literature for the spanning tree variant. Solving its linear… (More)

- Markus Leitner, Mario Ruthmair, Günther R. Raidl
- Networks
- 2013

- Mario Ruthmair
- 2012

- Günther Raidl, Doris Dicklberger, Andreas Müller, Christopher Bacher, Benjamin Biesinger, Frederico Dusberger +5 others
- 2013