Over the last decades, the economic, social and environmental sustainability of the conventional agri-food system has and continues to be contested within both academic and public institutions. For small farms, the unsustainability of the food system is even more serious; farms’ declining share of profit and the cost-price squeeze of commodity production has increased barriers to market access ...

We model knowledge diffusion in a population of agents situated on a network, interacting only over direct ties. Some agents are by nature traders, others are by nature “givers”: traders demand a quid pro quo for information transfer; givers do not. We are interested in efficiency of diffusion and explore the interplay between the structure of the population (proportion of traders), the network...

Recent studies have demonstrated the existence of community structure and rich club nodes, (i.e., highly interconnected, high degree hub nodes), in human brain functional networks. The cognitive relevance of the detected modules and hubs has also been demonstrated, for both task based and default mode networks, suggesting that the brain selforganizes into patterns of co-activated sets of region...

Psychological theories suggest that emotion represents the state of mind and instinctive responses of one’s cognitive system (Cannon 1927). Emotions are a complex state of feeling that results in physical and psychological changes that influence our behavior. In this paper, we study an interesting problem of emotion contagion in social networks. In particular, by employing an image social netwo...

This work is a longitudinal network analysis of the interaction networks of Wikipedia, a free, user-led collaborativelygenerated online encyclopedia. Making a case for representing Wikipedia as a knowledge network, and using the lens of contemporary graph theory, we attempt to unravel its knowledge creation process and growth dynamics over time. Typical small-world characteristics of short path...

Being intrigued by a disproportionately small number of empirical studies on Burt’s (1992) structural-hole thesis, as well as the contention that the predictive accuracy of the thesis differs across cultural contexts, this note develops a formal model that helps understand the relationship between culture, social norms, and structural holes. We first present a network model that features cooper...

1. INTRODUCTION The university is a fundamental social institution. It is a haven for research and is where the next generation gets educated. Gaining knowledge of its properties and understanding how it functions are thus of inherent value to society. In our project, we analyzed Stanford's academic network , where faculty members are vertices and edges between faculty members represent academi...

We consider a variant of a question of Erdős on the number of empty k-gons (k-holes) in a set of n points in the plane, where we allow the k-gons to be non-convex. We show bounds and structural results on maximizing and minimizing the number of general 4-holes, and maximizing the number of non-convex 4-holes. In particular, we show that for n ≥ 9, the maximum number of general 4-holes is ( n 4 ...

Recent work on the dynamical evolution of galactic nuclei containing supermassive black holes is reviewed. Topics include galaxy structural properties; collisionless and collisional equilibria; loss-cone dynamics; and dynamics of binary and multiple supermassive black holes. Dynamics of galaxy cores 2

This study looks at the social network that exists during information systems development (ISD). By introducing a social network perspective of information systems project management, social network analysis and its concepts of embeddedness, structural holes, and centrality can be used to reveal organizational phenomena that might otherwise be overlooked. In this study we analyze the social net...