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The world is increasingly populated with interactive agents distributed in space, real or abstract. These agents can be artificial, as in computing systems that manage and monitor traffic or health; or they can be natural, e.g. communicating humans, or biological cells. It is important to be able to model networks of agents in order to understand and optimise their behaviour. Robin Milner describes in this book just such a model, by presenting a unified and rigorous structural theory, based on bigraphs, for systems of interacting agents. This theory is a bridge between the existing theories of concurrent processes and the aspirations for ubiquitous systems, whose enormous size challenges our understanding. The book is reasonably self-contained mathematically, and is designed to be learned from: examples and exercises abound, solutions for the latter are provided. Like Milner's other work, this is destined to have far-reaching and profound significance.

Communication --- Telecommunication systems --- Machine theory. --- Nets (Mathematics) --- Network analysis --- Mathematical models. --- Electrical engineering.

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"For the last two decades, IS researchers have conducted empirical studies leading to better understanding of the impact of Systems Analysis and Design methods in business, managerial, and cultural contexts. SA & D research has established a balanced focus not only on technical issues, but also on organizational and social issues in the information society.This volume presents the very latest, state-of-the-art research by well-known figures in the field. The chapters are grouped into three categories: techniques, methodologies, and approaches."--Provided by publisher.

System analysis. --- System design. --- Design, System --- Systems design --- Electronic data processing --- System analysis --- Network analysis --- Network science --- Network theory --- Systems analysis --- System theory --- Mathematical optimization

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Programming --- Communication --- Telecommunication systems --- Machine theory. --- Nets (Mathematics) --- Systèmes de télécommunications --- Automates mathématiques, Théorie des --- Réseaux (Mathématiques) --- Network analysis --- Mathematical models. --- Analyse de réseau --- Modèles mathématiques --- Systèmes de télécommunications --- Automates mathématiques, Théorie des --- Réseaux (Mathématiques) --- Analyse de réseau --- Modèles mathématiques

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Online social networks --- Data mining --- Social sciences --- Electronic social networks --- Social networking Web sites --- Virtual communities --- Social media --- Social networks --- Sociotechnical systems --- Web sites --- Behavioral sciences --- Human sciences --- Sciences, Social --- Social science --- Social studies --- Civilization --- Network analysis --- Communities, Online (Online social networks) --- Communities, Virtual (Online social networks) --- Online communities (Online social networks)

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This monograph presents, for the first time, a unified and comprehensive introduction to some of the basic transport properties of porous media, such as electrical and hydraulic conductivity, air permeability and diffusion. The treatment is based on critical path analysis and the scaling of transport properties which are individually described as functions of saturation. At the same time, the book supplies a tutorial on percolation theory for hydrologists, providing them with the tools for solving actual problems. In turn, a separate chapter serves to introduce physicists to some of the language and complications of groundwater hydrology necessary for successful modelling. End of chapter problems often indicate open questions, on which young researchers entering the field can readily start work on. This significantly revised and much expanded edition was made necessary by both the selling out of the first edition and the rapid progress in the field. At the same time the tutorial aspects of the first few chapters have been considerably improved and the number of models, experiments and range of medium properties considered have been increased. Topics discussed for the first time in detail in this edition are advanced topological aspects of percolation theory that serve as a basis for examining dispersion aspects in porous media. "The book is suitable for advanced graduate courses, with selected problems and questions appearing at the end of each chapter. [...] I think the book is an important work that will guide soil scientists, hydrologists, and physicists to gain a better qualitative and quantitative understanding of multitransport properties of soils." (Marcel G. Schaap, Soil Science Society of America Journal, May-June, 2006).

Porous materials --- Percolation (Statistical physics) --- Critical path analysis --- Atomic Physics --- Physics --- Physical Sciences & Mathematics --- Transport properties --- Critical path analysis. --- Transport properties. --- CPM (Network analysis) --- Critical path method --- Path analysis, Critical --- Porous media --- Physics. --- Hydrology. --- Earth sciences. --- Hydrogeology. --- Continuum physics. --- Statistical physics. --- Dynamical systems. --- Physics, general. --- Hydrology/Water Resources. --- Statistical Physics, Dynamical Systems and Complexity. --- Classical Continuum Physics. --- Earth Sciences, general. --- Network analysis (Planning) --- Lattice theory --- Statistical physics --- Materials --- Porosity --- Hydraulic engineering. --- Geography. --- Complex Systems. --- Classical and Continuum Physics. --- Cosmography --- Earth sciences --- World history --- Engineering, Hydraulic --- Engineering --- Fluid mechanics --- Hydraulics --- Shore protection --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics --- Geosciences --- Environmental sciences --- Classical field theory --- Continuum physics --- Continuum mechanics --- Dynamical systems --- Kinetics --- Mathematics --- Mechanics, Analytic --- Force and energy --- Mechanics --- Statics --- Mathematical statistics --- Aquatic sciences --- Hydrography --- Water --- Geohydrology --- Geology --- Hydrology --- Groundwater --- Statistical methods