The river ecosystem has the characteristics of coexistence clarity and ambiguity. starting point eco-friendly reservoir operation is to fully consider ecological water requirements lower reaches reservoir, so it also vagueness. fuzzy theory an excellent tool realize quantification concepts. In this paper, variable set (VS) introduced into decision-making field scheduling scheme optimization. Ta...

BACKGROUNDS/OBJECTIVES A discussion and analysis of factors that contribute to nurses' happiness index can be useful in developing effective interventions to improve nurses' enthusiasm, sense of honor and pride and to improve the efficiency and quality of medical services. METHODS In this study, 206 registered nurses at the 2011 annual encounter for 12 Hanchuan hospitals completed a questionn...

let $g=(v,e)$ be a‎ ‎simple graph of order $n$ and size $m$‎. ‎an $r$-matching of $g$ is ‎a set of $r$ edges of $g$ which no two of them have common vertex‎. ‎the hosoya index $z(g)$ of a graph $g$ is defined as the total‎ ‎number of its matchings‎. ‎an independent set of $g$ is a set of‎ ‎vertices where no two vertices are adjacent‎. ‎the ‎merrifield-simmons index of $g$ is defined as the tota...

Vertical Integration and Dis-integration of Computer Firms: A History Friendly Model of the Co-evolution of the Computer and Semiconductor Industries Other How to cite: Malerba, Franco; Nelson, Richard; Orsenigo, Luigi and Winter, Sidney (2006). Vertical Integration and Dis-integration of Computer Firms: A History Friendly Model of the Co-evolution of the Computer and Semiconductor Industries. ...