We study geometrical properties of the complete set of solutions of the random 3-satisfiability problem. We show that even for moderate system sizes the number of clusters corresponds surprisingly well with the theoretic asymptotic prediction. We locate the freezing transition in the space of solutions which has been conjectured to be relevant in explaining the onset of computational hardness i...

We determine the exact freezing threshold, r , for a family of models of random boolean constraint satisfaction problems, including NAE-SAT and hypergraph 2-colouring, when the constraint size is sufficiently large. If the constraint-density of a random CSP, F , in our family is greater than r then for almost every solution of F , a linear number of variables are frozen, meaning that their colo...

During the past two decades, an impressive array of diverse methods from several different mathematical fields, including algebra, logic, analysis, probability theory, graph theory, and combinatorics, have been used to analyze both the computational complexity and approximabilty of algorithmic tasks related to the constraint satisfaction problem (CSP), as well as the applicability/limitations o...

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Due to the increasingly multicultural nature of e-learning environments, it is critical that instructors and instructional designers be aware of the importance of cultural factors in education and that they deliver culturally adaptive instruction. The main challenge of this paper is identifying the critical success factors for multicultural online learning from learners’ perceptions and their r...

this study examined the relationship between tourists' motivations and satisfaction in tehran ski resorts. the study was a descriptive study and of correlation kind and conducted as a field study. the statistical population consisted of all tourists of tehran ski resorts (dizin, shemshak, tochal and abali). according to the estimates of the managers of these ski resorts, the statistical po...

Asking citizens “the way democracy works” is the basis of a wide literature on support have for their political institutions and one most common survey items in science. Moreover, it key indicator purported global decline legitimacy. Yet, its trends, levels, dynamics are still debated, conclusions may be erroneous. In this paper, we compile unique dataset between 1973 2018 encompassing all majo...

neighborhood attachment is closely related to concrete and abstract conceptions that set the scene for a variety of interactions among the residents. it is on the basis of social-physical location which happens over time. neighborhood attachment also enhances the possibility of residents’ social participation in urban neighborhoods and has a bilateral relationship with residents’ satisfaction. ...

background: measurement of patients’ satisfaction as a reliable indicator of quality of hospital service shows the ability of care providers to meet patients' expectations. this study was conducted to assess patients’ satisfaction in hospital services. methods:  this cross-sectional study was carried out at the zanjan university of medical sciences in 2013 -2014. a total of 486 were select...

the level of in job satisfaction of the experts engaged in college of agriculture, and natural resources of tehran university was the purpose followed in this study. statistical population of the research included all the experts, a number of 123 members in the university college. questionnaires were sent to all the participants picked up by means of census method. ninety eight participants had...