Article history: Received 30 September 2007 Accepted 11 December 2008 Available online30December2008

In this course, one main objective is to demonstrate the wide applicability of operations research tools to real systems. Hence, we will focus on modeling and analysis of various economic and social problems as illustrated by examples from the literature. Although we will not cover any solution technique in depth, we will introduce some new analysis tools that are typically outside the scope of...

An exponential dominating set of graph $G = (V,E )$ is a subset $Ssubseteq V(G)$ such that $sum_{uin S}(1/2)^{overline{d}{(u,v)-1}}geq 1$ for every vertex $v$ in $V(G)-S$, where $overline{d}(u,v)$ is the distance between vertices $u in S$ and $v  in V(G)-S$ in the graph $G -(S-{u})$. The exponential domination number, $gamma_{e}(G)$, is the smallest cardinality of an exponential dominating set....

background: primary hyperhidrosis (ph) refers to excessive sweating, beyond normal physiological levels, in specific sites of the body for unknown reasons. it is usually bilateral and is most prominent in the palms, axillae, feet, and face. ph prevalence is estimated to be 0%-6.1% in different populations. it usually begins in childhood and is more frequent in women. in 57% of cases, there is a...

t he purpose of this study was to examine farm operations cooperation groups in central agricultural zone of delta state, nigeria. all the members of the six  selected groups were used for the study. the data which were collected with the use of questionnaire and interview schedule were analyzed with the use of frequency counts, percentages and tobit regression model. most of the members were ...

in this paper, some applications of our earlier results in working with chemical graphs arepresented.