In Proceedings of the 2nd International Workshop on Active and Programmable Grids Architectures and Components, APGAC05 http://www.ee.ucl.ac.uk/~nsg/conferences/apgac05/ as part of ICCS05 http://dcl.mathcs.emory.edu/iccs/index.php , Atlanta, GA, May 2005., Vol. 3516 (May 2005), pp. 275-278.