Tough Mining

Tough Mining

Caenorhabditis elegans, a 1-mm soil-dwelling roundworm with 959 cells, may be the best-understood multicellular organism on the planet. As the most " pared-down'' animal that shares essential features of human biology—from embryogenesis to aging—C. elegans is a favorite subject for studying how genes control these processes. The way these genes work in worms helps scientists understand how dise...

Efficient strategies for tough aggregate constraint-based sequential pattern mining

Frequent sequential pattern mining with constraints is the task of discovering patterns by incorporating the user defined constraints into the mining process, thus not only improving mining efficiency but also making the discovered patterns to better meet user requirements. Though many studies have been done, few have been carried out on the ‘‘tough aggregate constraints’’ due to the diffIculty...

Tough times call for tough decisions.

Tough spiders

Spider graphs are the intersection graphs of subtrees of subdivisions of stars. Thus, spider graphs are chordal graphs that form a common superclass of interval and split graphs. Motivated by previous results on the existence of Hamilton cycles in interval, split and chordal graphs, we show that every 3/2-tough spider graph is hamiltonian. The obtained bound is best possible since there are (3/...

It's Tough...

?for This is a small booklet prepared by the Brother and Sister group of the Association ?-the Help of Retarded Children in New York. It is written to help children who have retarded brother or sister, and summarises such problems as how to accept the situate11' It also gives practical suggestions, such as activities the family can do together. The ide of such a booklet and the points discussed...