Using a heterogeneous agent, life-cycle model of Social Security claiming, labor supply and saving, we consider the implications lifespan inequality for reform. Quantitative experiments show that welfare is maximized when baseline benefits are independent lifetime earnings, payroll tax cap 50% larger than its current level, claiming adjustments reduced. The system would maximize in “2050 demogr...

The use of social and contact networks to answer basic and applied questions about infectious disease transmission in wildlife and livestock is receiving increased attention. Through social network analysis, we understand that wild animal and livestock populations, including farmed fish and poultry, often have a heterogeneous contact structure owing to social structure or trade networks. Networ...

divorce as a social issue in iran has experienced lots of changes during the previous decades. in the present article, these changes are investigated considering the mode of their social development. to state the diverse dimensions of changes in the social structure of divorce in iran, the theoretical “analytic- realistic” model as one of the most efficient theoretical models has been utilized ...

In this dissertation, we study the problem of social media recommendations with a heavy emphasis on exploiting social, content and contextual information. The problem of recommendation analysis and collaborative filtering has been widely studied in the literature because of its numerous applications to a wide variety of scenarios. Many social media sites such as Flickr or YouTube contain multim...

Link prediction is an important task in social networks and data mining for understanding the mechanisms by which the social networks form and evolve. In most link prediction researches, it is assumed either a snapshot of the social network or a social network with some missing links is available. Most existing researches therefore approach this problem by exploring the topological structure of...