مدل سازي مبتني بر نظريه در علوم اجتماعي با تاكيد بر استنتاج فازي

چكيده انگليسي :

Theory Based Modeling in Social Sciences with the Emphasis on Fuzzy Inference Seyed Ata Bitaraf sa bitaraf@ec iut ac ir bitaraf ata@gmail com March 5th 2011 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Dr Sheikholeslam F Email address sheikh@cc iut ac ir And Dr Ghasemi V Email address v ghasemi@ltr ui ac ir Abstract Theory based modeling is a way of modeling in which qualitative data namely linguistic expressions are participating for making a model representing a real system Modeling in Social Sciences usually uses quantitative data out of the questionnaires in addition to the qualitative data Structural Equation Modeling SEM is one of the new complicated and widely used methods toward making models for different social aspects of research in which the desirable model is the one which satisfies both statistical and theoretical indices SEM has an algorithm that includes five recursive steps in which the quantitative and qualitative aspects are being checked one after another regarding their corresponding conditions including statistical indices and theoretical basis respectively The recursive process of finding a desirable model is only terminated when the both mentioned conditions are satisfied although it is possible not to find a good model that complies our demands in such cases more theoretical researches are necessary towards either adding or removing other parameters into our default model In addition to the SEM the familiar Fuzzy ways of modeling Set Analysis SA and Cognitive Maps CM are considered as some effective qualitative ways of modeling in Social Sciences In SEM and CM the inner causal relationships among the variables inside our model are analyzed therefore the inner structure of a system is presentable for a researcher to find a better insight from the inside of the model The usual Fuzzy Models like Fuzzy Inference Systems FIS and Anfis have input output point of view so they are mainly used for prediction or simulation applications SA is confronting two different variables in its crosstabs in which corresponding levels of both variables are met and out of a process corresponding linguistic expressions are made If Fuzzy Logic were used that would be possible to make a set of relatively true linguistic expressions too Generally all different ways of modeling that use qualitative data alone or in addition to the quantitative ones are useful in applications in which quantitative data are not reliable enough to make a certain decision Socialists in their social researches do not usually rely on quantitative results because these digits are seemed vague from the roots of finding in their points of view but the use of qualitative way of modeling in industrial applications is not ignorable either Desirable regulation of the output in a semi automation process on the basis of its user s demand would be a tough selection if we considered the relative meaning of desirability and different users demands The semi automation is necessary if the user s demand is supposed to be a part of the close loop control structure achieving a desirable output on the basis of its user s demand Furthermore for making it convenient for a user to deal with the machinery some intermediate devices are necessary to make a bridge between the human language and the machine language Pure FIS making toolbox is a new featured toolbox introduced by this thesis depicting such facilities towards making that bridge available in MATLAB software Arrangement of graphical features providing a better opportunity for its users to plot their own selective membership functions plotting membership function like painting them and inserting fuzzy sets as inputs into the fuzzy models are among the facilities and characteristics of this toolbox making it a user friendly software An approach to make all imaginable fuzzy sets out of a few numbers of key fuzzy

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مدل سازي مبتني بر نظريه در علوم اجتماعي با تاكيد بر استنتاج فازي

مدل سازي معادله ساختاري , تحليل مجموعه اي , پنجره گرافيكي ساخت سيستم هاي فازي خالص , نقشه ادراكي