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Unformatted text preview: ure networks: e.g., Internet (connections of routers or
administrative domains), power grid, transportation networks (road,
rail, airline, mail)
Temporary networks: e.g., ad hoc communication networks, sensor
networks, autonomous vehicles
Questions: Does network structure support performance? Fragility?
Cascading failures? Biological networks: A number of biological systems can also be
represented as networks.
Food web, protein interaction network, network of metabolic pathways 4 Networks: Lecture 2 Introduction Network Study
Historical study of networks:
Mathematical graph theory: One of the pillars of discrete mathematics
Started with Euler’s celebrated 1735 solution of the Ko nigsberg bridge
problem. Networks also studied extensively in sociology.
Typical studies involve circulation of questionnaires, leading to small
networks of interactions. Recent years witnessed a substantial change in network research.
From analysis of single small graphs (10-100 nodes) to statistical
properties of large scale networks (million-billion nodes).
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- Fall '09