• Department of Computer Science, Attila Joszef University, Szeged, Hungary, December 3-6, 1995. ``Some results on on-line bin packing".
  • Department of Computer Science, Attila Joszef University, Szeged, Hungary, March 10-30, 1996. ``Semi on-line algorithms for scheduling problems".
  • Department of Computer Science , Evry University, France, November 10-20, 2001. Working on ``multiprocessor-tasks scheduling''.
  • ID-Institute IMAG , Grenoble, France, September 8-15, 2002. Working on ``On-line scheduling for malleable tasks".
  • DFG Graduate School CGC, Free University of Berlin, June 16-17, 2003. `` Scheduling parallel jobs on networks ". 
  • DFG Graduate School 357 , Kiel University, June 30, 2003. ``Scheduling parallel jobs on networks". 
  • School of Informatics , Kyoto University, Japan, July 6-8, 2003. ``Two-dimensional bin packing with applications in scheduling".
  • ID-Institute IMAG , Grenoble, France, October 19-24, 2003. Working on ``Cluster scheduling with sharing resources".
  • Department of Computer Science , University of Szeged, Hungary, June 23-27, 2004. Working on ``New problems in bin packing".
  • Department of Computer Science , University of Kiel, Germany, January 21-February 14, 2005. " Online removable square packing "
  • School of Informatics, Kyoto University, Japan, January 21- February 16, 2006. ``To be energetic or lazy? It is a problem!".
  • Department of Systems Engineering and Enginnering Management , The Chinese University of Hong Kong, March 5- 21, 2006. 
  • Department of Industrial Engineering and Logistics Management , The Hong Kong University of  Science and Technology, March 17, 2006. `` Online and Offline Algorithms for Two-Dimensional Knapsack".
  • ID-Institute IMAG , Grenoble, France, July 1-22, 2007. Working on ``On-line scheduling".
  • Research Institute of Discrete Mathematics, University of Bonn, Germany, July 23-26, 2007. ``Strip Packing vs. Bin Packing".
  • School of Informatics, Kyoto University, Japan, January 21- February 20, 2008.``Online scheduling of equal-length jobs on parallel
    machines".
  • Department of Computer Science and Engineering, The Hong Kong University of  Science and Technology, March 1-31, 2008.
  • Department of Computer Science and Engineering, The University of  Hong Kong, April 28-May 2, 2008.
  • ID-Institute IMAG , Grenoble, France, May 17-22, 2008.
  • School of Informatics, Kyoto University, Japan, January 20- February 19, 2009.``Stable bin packing".