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- Gary Chartrand, Futaba Fujie-Okamoto, Craig W. Rasmussen, Ping Zhang
- Discussiones Mathematicae Graph Theory
- 2009

For a nontrivial connected graph G, let c : V (G) → N be a vertex coloring of G where adjacent vertices may be colored the same. For a vertex v of G, the neighborhood color set NC(v) is the set of colors of the neighbors of v. The coloring c is called a set coloring if NC(u) = NC(v) for every pair u, v of adjacent vertices of G. The minimum number of colors… (More)

- J. Richard Lundgren, Craig W. Rasmussen, John S. Maybee
- Discrete Mathematics
- 1993

The competition graph of a loopless symmetric digraph If is the rwo-.\rc'p grclph. S,(H). Necessary and sufficient conditions on If are given for S,(ff) to be interval or unit interval. These are useful properties when application requires that the competition graph be efficiently colorable. Computational aspects are discussed. as are related open problems.… (More)

- J. Richard Lundgren, Craig W. Rasmussen
- Discrete Mathematics
- 1993

Competition graphs were rst introduced by Joel Cohen in the study of food webs and have since been extensively studied. Graphs which are the competition graph of a strongly connected or Hamiltonian digraph are of particular interest in applications to communication networks. It has been previously established that every graph without isolated vertices… (More)

Dedicated by the other authors to Professor John Maybee on the occasion of his 65th birthday. Abstract. One of the intriguing open problems on competition graphs is determining what digraphs have interval competition graphs. This problem originated in the work of Cohen 5, 6] on food webs. In this paper we consider this problem for the class of loopless… (More)

- Craig W. Rasmussen, Cynthia E. Irvine, George W. Dinolt, Timothy E. Levin, Karen L. Burke
- World Conference on Information Security…
- 2003

Large complex systems need to be analysed prior to operation so that those depending upon them for the protection of their information have a well defined understanding of the measures that have been taken to achieve security and the residual risk the system owner assumes during its operation. The U.S. military calls this analysis and vetting process… (More)

The p-competition graph G of a digraph D is a graph on the same vertex set as D, with x; y] 2 E(G) if and only if jOut(x) \Out(y)j p in D. In this paper we focus on the case in which D is a symmetric digraph ((a; b) is an arc in D if and only if (b; a) is an arc in D). We relate the problem to 2-step graphs, squares, and a generalization of the neighborhood… (More)

The (p)-neighborhood graph of a graph G, denoted N p (G), is de-ned on the same vertex set as G, with x; y] 2 E (N 2 (G)) if and only if jN(x)\N(y)j p in G, where N (v) is the open neighborhood of vertex v. The p]-neighborhood graph of G, N p G], is deened similarly, using closed neighborhoods rather than open ones. If G is the underlying graph of a… (More)

- H Huchzermeyer, F Paul, E Seifert, H Fröhlich, C W Rasmussen
- Endoscopy
- 1977

In our experience with five cases of Crohn's disease of the esophagus, the endoscopic appearance has been demonstrated. Corresponding to the basic pathological changes, the findings are very different, but two stages may be differentiated: Stage I in which inflammatory changes predominate as a mild or more often erosive-ulcerative esophagitis. Stage II is a… (More)

- Persson, T Yde, +10 authors Bjørling-Poulsen
- 2007

(2007) Carboxyl and arboxamide pyrazoles as protein kinase inhibitors in corrupt eukaryotic signal transduction: Induction of growth arrest in MCF-7 cancer cells. of cell death in antiestrogen-resistant human breast cancer cells by the protein kinase CK2 inhibitor DMAT. (2007) Breast cancer cells with acquired anti-estrogen resistance are sensitized to… (More)