W e extend the path status graph (PSG) method of delay faul t simulation to sequential circuits. By devising a layered PSG and restricting the number of timeframes over which a fault mus t be detected, we preserve the non-enumerative nature of the simulation algorithm. T h e program is capable of simulating a wide variety of circuits (synchronous, asynchronous, multiple-clock and tri-state logi...

in this paper, a novel topological index, named m-index, is introduced based on expanded form of the wiener matrix. for constructing this index the atomic characteristics and the interaction of the vertices in a molecule are taken into account. the usefulness of the m-index is demonstrated by several qspr/qsar models for different physico-chemical properties and biological activities of a large...

The combinatorial theory for the set of parity alternating permutations is expounded. In view of the numbers of ascents and inversions, several enumerative aspects of the set are investigated. In particular, it is shown that signed Eulerian numbers have intimate relationships to the set.