체인지온 정재승

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체인지온 정재승

  1. 1. 자연과학자가 바라본 ‘Social Network’ KAIST 바이오및뇌공학과 정재승
  2. 2. Paul Erdos: Erdos Numbers
  3. 3. 케빈 베이컨의 여섯 단계 게임 (Six degrees of Kevin Bacon)
  4. 4. Kevin Bacon Game
  5. 5. Small world network Bullmore and Sporns, 2009
  6. 6. Scale-free network
  7. 7. Zipf’s Law George Zipf's 1949 observation that the frequency of words used in the English language followed a powerlaw distribution is a profound thing. It not only defined ‘Zipf's Law’, which gives a simple rule to explain why some words (e.g. the, of, and) are far more commonly used than others.
  8. 8. The scale-free nature of the web of sexual contacts. • They analyze data gathered in a 1996 Swedish survey of sexual behavior. The survey--involving a random sample of 4781 Swedish individuals (ages 18-74 yr)-- used structured personal interviews and questionnaires to collect information. • The response rate was 59 percent, corresponding to 2810 respondents. Connections in the network of sexual contacts appear and disappear as sexual relations are initiated and terminated. • To analyze the connectivity of this dynamic network, whose links may be quite short lived, we first analyze the number k of sex partners over a relatively short time window--the twelve months prior to the survey.
  9. 9. Preferential Attachment
  10. 10. 1. Introduction : Self-Organization - A process of attraction and repulsion in which the internal organization of a system, normally an open system, increases in complexity without being guided or managed by an outside source (From Wikipedia) - Typically displays Emergent Properties Self-Organized Criticality: The origin of 1/f in the Brain
  11. 11. Complex Systems • Nonlinear basic unit/individual • Nonlinear interactions among units • Complex and ordered structures • Intrinsic stochastic noises • Dynamical transition of the states • Rich phenomena: chaos, fractal, small-world effect, scale-free behavior, intermittency, bursting, and synchronization. • Dynamical adaptation! • Wake from your reverie “homeostasis and stability.” • Focus on the complexity of the system! • Only a short-term prediction is possible. • Interdisciplinary research will be more preferable and useful.
  12. 12. Complex dynamics of heart rate variability
  13. 13. Breakdown of a fractal physiological control mechanism can lead ultimately either to a highly periodic output dominated by a single scale or to uncorrelated randomness.
  14. 14. African Fractal
  15. 15. Hub and connectors vs. Weak ties
  16. 16. Collective Intelligence • 여러 사람들이 함께 문제를 해결하고, 서로 의견을 공유하며, 각자 자신 이 가진 것을 기여하고 참여하며, 서로 보완하는 정신 (참여, 공유, 개방).
  17. 17. Suggestions • Social network 은 complex systems 의 전형적인 예 중 하나 다. Complex network 의 창발성을 활용하자! • 공공캠페인을 위해 Worldwide Web, Blogosphere 등을 적극 적으로 활용하자! • Diffusion of Buzz: 매력적인 바이러스를 만들자! • ‘Information Cascade’를 이끌어내자! • 허브와 커넥터를 공략하자! • ‘약한 유대의 힘’을 활용하자! • 자발적인 참여, 공유, 개방을 활용하자!

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