Alternatyvų vertinimas neapibrėžtumo sąlygomis

Abstract

Task of decisions-making in constructing industry becomes more difficult. Expression 'trying to reach maximum effect with minimum expense", means making decision by two aims. But brought up aims often contradict each other. This means that disagreement situation arises, which is understandable as indefinite. To solve the problem the fuzzy sets theory can be used and a new model can be made. Trying to estimate the aims of conflicts, the circumstances that influence the decision are divided into two groups. The first circumstances of inherent influence - defines what a decision-maker must attain. The second group circumstances of outward influence - defines what a decision-maker must estimate as a limitation. Dependence between inherent and outward circumstances in this step is formed. The valuation takes place in three levels. In the first a meaning of dependence for inherent circumstances is calculated, matrix is determined and dependence degree of each alternative is calculated. In the second meanings of dependence for outward circumstances arc calculated. In the third level the results of first two levels are summed. Using operator of minimum general matrix of decisions-making is determined. Minimax principle makes the decision, and max value is selected from the minimal values. The received result is optimum, because it is to satisfy aim appraising the conflict. In the paper a practical example is presented. Competently distributing circumstances of influence the means of conflict character can be explained and interpretation using described method can be made.