in this paper, we try to use modeling based on singular perturbation theory, in order to control satellite attitude during the wide rolling angle maneuvering through nonlinear h∞ control strategy. differential equations describing dynamics of the satellite are presented first, and by choosing the appropriate dynamic model for actuators and based on the standard singular perturbation model, the ...

the focus of this study is to analyze the text world of omar khayyam's poetry by a novel approach called cognitive poetics. to examine the author’s/reader's text world, the study has employed freeman’s model (1998). she believes that conceptual mapping in literary texts can operate at three different levels including “attribute mapping,” “relational mapping,” and “system mapping.” through readi...

This paper presents a simulation of world-systems theory’s iteration model of early human societies. The polities modeled are composed of sedentary foragers and/or simple horticulturalists that rely upon basic subsistence technologies and display low levels of internal differentiation. World-systems theory’s iteration model integrates several processes of demographic regulation: environmental c...

World-systems analysis is a knowledge movement elaborated since the 1970’s and is a critique of dominant modes of analysis in the nineteenth-century social sciences. It insists on three things primarily: (1) World-systems (and not nation-states) are the basic unit of social analysis; (2) Neither nomothetic nor idiographic epistemologies permit useful analyses of social reality; (3) The existing...

When Immanuel Wallerstein (1974) subverted the mid-1970s social science scene with his concept of the ‘world-system,’ development, the ‘master’ concept of social theory, suffered a fatal blow. Wallerstein’s critique of development emphasized its misapplication as a national strategy in a hierarchical world where only some states can ‘succeed.’ Wallerstein’s path-breaking epistemological challen...