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Kim, C. and D.H. Lee, Separating k-separated eNCE graph languages, An eNCE graph grammar is k-separated (k > 1) if the distance between any two nonterminal nodes in any of its sentential forms is at least k. Let SEP, denote the class of graph languages generated by SEPl (SEP2) is the class of eNCE (boundar E) graph languages, Recently, Engelfriet et al.(More)
We have investigated adsorption of an O(2) molecule on a double-walled carbon nanotube (DWCNT) edge using density functional theory calculations. An O(2) molecule adsorbs exothermally without an adsorption barrier at open nanotube edges that are energetically favorable with a large adsorption energy of about -9 eV in most cases. Dissociative adsorption of(More)
Recently, Lee et al. [S. authenticated key agreement scheme, Appl. Math. Comput., in press] showed that Lee–Lee password-based authenticated key agreement scheme [N. Further improvement on the modified authenticated key agreement scheme, Appl. Math. Comput. 157 (2004) 729–733] is vulnerable to an off-line dictionary attack and proposed an improved scheme.(More)
We report the density-functional calculations of NO2 adsorption on single-walled carbon nanotube walls. A single molecular adsorption was endothermic with an activation barrier, but a collective adsorption with several molecules became exothermic without an activation barrier. We find that NO2 adsorption is strongly electronic structure- and(More)