7,180 research outputs found
Spatial embedding as an enabling constraint: Introduction to a special issue of complexity on the topic of “Spatial Organisation”
No full textWe introduce and discuss the role of spatial embedding as an enabling constraint on complex system structure and function
Competition and the dynamics of group affiliation
No full textHow can we understand the interaction between the social network topology of a population and the patterns of group affiliation in that population? Each aspect influences the other: social networks provide the conduits via which groups recruit new members, and groups provide the context in which new social ties are formed. From an organisational ecology perspective, groups can be considered to compete with one another for the time and energy of their members. Such competition is likely to have an impact on the way in which social structure and group affiliation co-evolve. While many social simulation models exhibit group formation as a part of their behaviour (e.g., opinion clusters or converged cultures), models that explicitly focus on group affiliation are rare. We describe and explore the behaviour of a model in which, distinct from most current models, individual nodes can belong to multiple groups simultaneously. By varying the capacity of individuals to belong to groups, and the costs associated with group membership, we explore the effect of different levels of competition on population structure and group dynamics
Bullock team, Lake Tyers, Victoria, ca. 1900 [picture] /
No full textTitle devised by cataloguer based on information from inscription.; In: Victorian views presented to S. Williamson Wallace by the officers of the Department of Agriculture, Melbourne, Victoria, 11 February, 1905.; Inscriptions: "Gippsland bullock team"--Printed lower right; "Bullock team, Lake Tyers"--In pen below image.; Condition: Spotting.; Also available in an electronic version via the internet at: http://nla.gov.au/nla.pic-an3105280-s76
Periphery of modernity in Paris
No full textNicholas Bullock continues his lecture about periphery of modernity in Paris.H.264/H,26
Nicholas Bullock, James Read, The Movement for Housing Reform in Germany and France, 1840-1914
No full textBrunet Jean-Paul. Nicholas Bullock, James Read, The Movement for Housing Reform in Germany and France, 1840-1914. In: Annales. Economies, sociétés, civilisations. 43ᵉ année, N. 2, 1988. pp. 541-542
Stability in flux: Community structure in dynamic networks
No full textThe structure of many biological, social and technological systems can usefully be described in terms of complex networks. Although often portrayed as fixed in time, such networks are inherently dynamic, as the edges that join nodes are cut and rewired, and nodes themselves update their states. Understanding the structure of these networks requires us to understand the dynamic processes that create, maintain and modify them. Here, we build upon existing models of coevolving networks to characterize how dynamic behaviour at the level of individual nodes generates stable aggregate behaviours. We focus particularly on the dynamics of groups of nodes formed endogenously by nodes that share similar properties (represented as node state) and demonstrate that, under certain conditions, network modularity based on state compares well with network modularity based on topology. We show that if nodes rewire their edges based on fixed node states, the network modularity reaches a stable equilibrium which we quantify analytically. Furthermore, if node state is not fixed, but can be adopted from neighbouring nodes, the distribution of group sizes reaches a dynamic equilibrium, which remains stable even as the composition and identity of the groups change. These results show that dynamic networks can maintain the stable community structure that has been observed in many social and biological systems
Interview with Nicholas Christopher, author of Somewhere in the Night: Film Noir and the American City
No full textInterview with Nicholas Christopher, author of Somewhere in the Night: Film Noir and the American Cit
Homophily and competition: a model of group affiliation
No full textHow can we understand the interaction between the social network topology of a population and the patterns of group affiliation in that population? Each aspect influences the other: social networks provide the conduits via which groups recruit new members, and groups provide the context in which new social ties are formed. While many social simulation models exhibit group formation as a part of their behaviour (e.g., opinion clusters or converged cultures), models that explicitly focus on group affiliation are rare. We introduce one such model, based upon the ecological theory of group affiliation, and use it to explore the effect of two system properties—bias toward the creation of homophilous ties and competition between groups—on the dynamics of social evolution and group formation
Group formation and social evolution: a computational model
No full textThe tendency to organise into groups is a fundamental property of human nature. Despite this, many models of social network evolution consider the emergence of community structure as a side effect of other processes, rather than as a mechanism driving social evolution. We present a model of social network evolution in which the group formation process forms the basis of the rewiring mechanism. Exploring the behaviour of our model, we find that rewiring on the basis of group membership reorganises the network structure in a way that, while initially facilitating the growth of groups, ultimately inhibits it
Resurrecting the Author
No full textPresentation of Nicholas Wolterstorff\u27s Paper Resurrecting the Author with time after for questions beginning at 18:00
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