Why We Live in Hierarchies?
A Quantitative Treatise
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Open AccessDecentralized traffic management of autonomous drones
Coordination of local and global aerial traffic has become a legal and technological bottleneck as the number of unmanned vehicles in the common airspace continues to grow. To meet this challenge, automation a...
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Open Access3D cell segregation geometry and dynamics are governed by tissue surface tension regulation
Tissue morphogenesis and patterning during development involve the segregation of cell types. Segregation is driven by differential tissue surface tensions generated by cell types through controlling cell-cell...
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Book
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Erratum to: Why We Live in Hierarchies?
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Chapter
Experiments on the Emergence and Function
By the nature of the subject, it is very difficult to obtain data about the emergence of hierarchy in actual living systems.
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Conclusions
In this chapter, we summarize the main lessons one can learn about hierarchy by considering the results presented in the previous chapters. The first point we would like to make is that we concentrated on work...
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Introduction
This book is concerned with the various aspects of hierarchical collective behaviour, which is manifested by most complex systems in nature. From the many possible topics, we plan to present a selection of tho...
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Definitions and Basic Concepts
In this chapter we define the notion of hierarchy, more precisely, the dominant-subordinate relationship. Based on this concept, the hierarchical nature of the entire system can be measured and analyzed, for w...
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Observations and Measurements
This chapter gives an overview of the (quantitative) observations and measurements related to hierarchy, concerning both animals and humans. Although, according to our approach, humans are deeply embedded into...
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Modelling Emergence and Control
In this chapter, we will consider some of the dynamical aspects of hierarchical systems as obtained from simulations of the related models. Although the emergence of hierarchy and the optimal ways of controlli...
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Friction forces position the neural anlage
During embryonic development, mechanical forces are essential for cellular rearrangements driving tissue morphogenesis. Here, we show that in the early zebrafish embryo, friction forces are generated at the in...
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Open AccessHierarchical networks of scientific journals
Academic journals are the repositories of mankind’s gradually accumulating knowledge of the surrounding world. Just as knowledge is organized into classes ranging from major disciplines, subjects and fields, t...
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Modeling the Emergence of Modular Leadership Hierarchy During the Collective Motion of Herds Made of Harems
Gregarious animals need to make collective decisions in order to keep their cohesiveness. Several species of them live in multilevel societies, and form herds composed of smaller communities. We present a mode...
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Open AccessRoute-dependent switch between hierarchical and egalitarian strategies in pigeon flocks
The mechanisms that underlie fascinating inter-individual interactions among animal groups have attracted increasing attention from biologists, physicists and system scientists. There are two well-known types ...
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Open AccessShock waves on complex networks
Power grids, road maps and river streams are examples of infrastructural networks which are highly vulnerable to external perturbations. An abrupt local change of load (voltage, traffic density, or water level...
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Group performance is maximized by hierarchical competence distribution
Groups of people or even robots often face problems they need to solve together. Examples include collectively searching for resources, choosing when and where to invest time and effort, and many more. Althoug...
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Overlap** Modularity at the Critical Point of k-Clique Percolation
One of the most remarkable social phenomena is the formation of communities in social networks corresponding to families, friendship circles, work teams, etc. Since people usually belong to several different c...
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Open AccessSegregation mechanisms of tissue cells: from experimental data to models
Considerable advance has been made in recent years in the research field of pattern formation by segregation of tissue cells. Research has become more quantitative partly due to more in-depth analysis of exper...
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Controlling edge dynamics in complex networks
The interaction of distinct units in physical, social, biological and technological systems naturally gives rise to complex network structures. Networks have constantly been in the focus of research for the pa...
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Swarming microtubules
An artificial system of microtubules propelled by dynein motor proteins self-organizes into a pattern of whirling rings. This observation may provide insight into collective motion in biological systems. See Lett...
