the problem of finding the minimum cost multi-commodity flow in an undirected and completenetwork is studied when the link costs are piecewise linear and convex. the arc-path model and overflowmodel are presented to formulate the problem. the results suggest that the new overflow model outperformsthe classical arc-path model for this problem. the classical revised simplex, frank and wolf and a ...

This chapter of a collective book aims at presenting the basics of decision making under risk. We ...rst de...ne notions of risk and increasing risk and recall de...nitions and classi...cations (that are valid independently of any representation) of behavior under risk. We then review the classical model of expected utility due to von Neumann and Morgenstern and its main properties. Issues rais...

abstract   background: due to the high incidence of breast cancer and the effect of its early diagnosis on decreasing morbidity and mortality, we used the gail model to study breast cancer risk in iranian women.   methods: this study was done in a simple randomized way. participants were 2000 iranian women older than 35 years old. the questionnaire consisted of demographic data such as age, rac...

background: the use of chemicals is essential in education resulting in exposure to these pollutant in a variety of chemical and research laboratories. chemical contaminants in chemical laboratories are in different forms and chemical exposure risk assessment is important for choosing appropriate controls in protecting the health of operators, experts and students. for risk assessment in chemic...