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Beschreibung
Individuals are seldom completely independent and should be considered as part of their social surroundings. Their actions both influence their social network and are influenced by the network. This phenomenon can be seen in online social networks formed on online platforms as well as in offline social networks formed, for example, by a group of scholars. In order to understand the fundamental… effects of influence in social systems, we model social networks by the means of a well understood mathematical model, a graph.
The first part of this dissertation focuses on the impact of gender on the formation of a network of PhD students and their supervisors. We find evidence for homophilic behavior as well as for the existence of a glass ceiling in a network from the data of co-authorship. From over 1.3 millions of authors of scientific articles in computer science, we extract the student-supervisor relationship graph and analyze its properties.
Furthermore, we introduce mathematical formulations for the occurrence of a glass ceiling and an influence inequality in a network. We establish a network forming process integrating three observed characteristics of this network, namely a smaller entry rate for women, preferential attachment, and homophilic behavior. We prove that these three conditions are sufficient to produce a glass ceiling in the network. We also show, that if one of these three characteristic is missing, the glass ceiling according to the mathematical definition does not occur.
In the second part of this dissertation we examine how opinions evolve in networks. Every node in the network has an initial opinion and the nodes can observe the opinions of their neighbors. We assume a simplistic setting where the nodes are influenced by the opinions of their neighbors and always change their opinion to the opinion of the majority of their neighbors. We study several different variations of this model and investigate how long the system takes to reach a stable state. For asynchronous networks we find unweighted graphs which take a quadratic number of steps until convergence. For unweighted synchronous networks we show graphs with a quadratic convergence, neglecting polylogarithmic factors. Additionally we show that allowing the influence to be weighted increases the convergence time dramatically to exponential time. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
10.06.2016
Sprache
Englisch
EAN
9783866285668
Herausgeber
Hartung-Gorre
Serien- oder Bandtitel
Series in Distributed Computing
Sonderedition
Nein
Autor
Barbara Keller
Seitenanzahl
118
Auflage
1
Einbandart
Taschenbuch
-.-
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