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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 (10100 nodes) to statistical
properties of large scale networks (millionbillion nodes).
Motivated by...
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 Fall '09
 Acemoglu

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