the aim of this study is to find the effect of trader’s biorhythmic cycles on their perceptual decisions in tehran stock exchange. according to author’s point of view, decision making is one of the major factors of management skills, and in some cases, it is equivalent of management (simon’s point of view). also considering this fact that the knowledge of psychological factors and it’s effects ...

Because of the complexity of decision-making environment, the uncertainty of fuzziness and the uncertainty of grey maybe coexist in the problems of multi-attribute group decision making. In this paper, we study the problems of multi-attribute group decision making with hybrid grey attribute data (the precise values, interval numbers and linguistic fuzzy variables coexist, and each attribute val...

conditions and quality of ethical decision making by entrepreneurs is an important concern in academic and public area in iran. different factors such as personal, environmental and nature of business are causing the ethical decision making by entrepreneurs, but the concern have to great attention in iranian academic institutions. thus, research goal is try to identify environmental factors inf...

in this paper, it is assumed that the “decision making units“( ) are consist of positive and negative input and output. firstly, the optimistic and pessimistic models have been suggested by using negative data and then units with most productive scale size are measured in optimistic and pessimistic models. these productive values are compared with double frontiers and hurwicz’s criterion to obt...

Researches using existing statistics and data collected from the area of study help officials at decision-making, to improve the region's problems, like the problem of the high rate of accidents in the region, despite the low volume of daily service. The uses of roundabouts in many parts of the world have many advantages over intersections, amongst them are increased safety and capacity and red...