Previous studies on adoption and diffusion of a new product in a social network commonly assumed a single tie between a pair of actors. That means they only looked at one type of relation, while analyzing a diffusion process. However, we may have multiple ties between a pair of actors as multiple relations can arise from different modes of interaction or because of different roles people play w...

Our study contributes to the debate on the evolution of cooperation in the singleshot Prisoner’s Dilemma (PD) played on networks. We construct a model in which individuals are connected with positive and negative ties. Some agents play signdependent strategies that use the sign of the relation as a shorthand for determining appropriate action toward the opponent. In the context of our model in ...

Using a new dynamical network model of society in which pairwise interactions are weighted according to mutual satisfaction, we show that cooperation is the norm in the hawks-doves game when individuals are allowed to break ties with undesirable neighbors and to make new acquaintances in their extended neighborhood. Moreover, cooperation is robust with respect to rather strong strategy perturba...

This article reports the results of a social network analysis (SNA) performed on the mother’s primary network of interaction in 15 Mexican American families in the city of El Paso, Texas, the neighborhood of La Villita, in Chicago, and the city of Lincoln, Nebraska. The goal of this study was to examine potential opportunities for Spanish use by her children as well as sources of information an...

the neighborhood has had a long history in iranian urbanization. since urban plans wereintroduced by the authorities to shape urban development in iran half a century ago, the concept of iranian traditional neighborhood has been neglected gradually. the concept of neighborhood has not found the appropriate status in urban design and planning yet. one of the main reasons is that academics, profe...

Environmental factors may have an important influence on children's physical activity, yet children's perspectives of their home and neighborhood environments have not been widely assessed. The aim of this study was to investigate children's perceptions of their environments, and to examine associations between these perceptions and objectively measured physical activity. The sample consisted o...

BACKGROUND Public housing residents have a high risk of chronic disease, which may be related to neighborhood environmental factors. Our objective was to understand how public housing residents perceive that the social and built environments might influence their health and wellbeing. METHODS We conducted focus groups of residents from a low-income public housing community in Baltimore, MD to...

OBJECTIVE Lifestyle interventions for type 2 diabetes mellitus (T2DM) are best positioned for success if participants live in supportive neighborhood environments. Deprived neighborhoods increase T2DM risk. Parks and other "green spaces" promote active lifestyles and therefore may reduce T2DM risk. We investigated association between neighborhood green space and the risk of T2DM in a large grou...

in this paper, new definitions of $l$-fuzzy closure operator, $l$-fuzzy interior operator, $l$-fuzzy remote neighborhood system, $l$-fuzzy neighborhood system and $l$-fuzzy quasi-coincident neighborhood system are proposed. it is proved that the category of $l$-fuzzy closure spaces, the category of $l$-fuzzy interior spaces, the category of $l$-fuzzy remote neighborhood spaces, the category of ...