although the subject of amending was reffered to in the draft constitution ,but due to revolution time circumstances,this principle was not approved.ten years of islamic state (1358 – 68 ) revealed some problems of the constitution like multiple decision making centers and existence of parallel organisations at administrative, legislative and judicial levels. after the war and considering appro...

The paper introduces a new approach to preference structure, where from a weak preference relation derive the following relations:strict preference, indifference and incomparability, which by aggregations and negations are created and examined. We decomposing a preference relation into a strict preference, anindifference, and an incomparability relation.This approach allows one to quantify diff...

the conflict between investors' interests and managers is an important issue which has been attracted researchers attentions in last decade. according to the related literature, corporate governance body of research has offered alternatives for solving this problem such as ownership structure. this research investigates the effect of ownership structure on firm performance. the factors whi...

Background and Objectives: Recently, photonic crystals have been considered as the basic structures for the realization of various optical devices for high speed optical communication. Methods: In this research, two dimensional photonic crystals are used for designing all optical logic gates. A photonic crystal structure with a triangular lattice is proposed for making NAND, XNOR, and OR optica...

in this article, we will estimate efficiency amountof decision-making unit by offering the continuous piecewise polynomialextrapolation and interpolation by ccr model input-oriented on the assumptionthat it is constant returns to scale in different times. and finally, we willestimate efficiency amount of decision-making unit indifferent times byoffering an example.

background : clinical decision making as a major part of the performance of professional nursing is the distinctive factor of professional nurses and non-professional health care personnel. this study aimed to assess the relationship between the exercise and physical activity and the nurses’ collaboration in clinical decision making in al-zahra hospital, isfahan, iran. methods: th descriptive-c...

This study attempts to reveal the effect of family structure on social participation of  Payame Noor university students, it consists of 339 students. The theoretical framework of this investigation is based on two hypotheses. Hegen personality structure theory and Parsons action theory.  One hypotheses is on satisfactoriness in the family structure were based on personality structure theory an...