2.체인지온 정재승
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2.체인지온 정재승

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과학자가 말하는 소셜 네트워크

과학자가 말하는 소셜 네트워크
Social Network in Science

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2.체인지온 정재승 2.체인지온 정재승 Presentation Transcript

  • 자연과학자가 바라본 ‘ Social Network’ KAIST 바이오및뇌공학과 정재승
  • Paul Erdos: Erdos Numbers
  • 케빈 베이컨의 여섯 단계 게임 (Six degrees of Kevin Bacon) View slide
  •   View slide
  • Kevin Bacon Game
  • Small world network Bullmore and Sporns, 2009
  • Scale-free network
  •  
  • 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.
  • 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.
  • Preferential Attachment
  • 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
  • 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.
  • Complex dynamics of heart rate variability
  • 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.
  • African Fractal
  •  
  • Hub and connectors vs. Weak ties
  • Collective Intelligence
    • 여러 사람들이 함께 문제를 해결하고 , 서로 의견을 공유하며 , 각자 자신이 가진 것을 기여하고 참여하며 , 서로 보완하는 정신 ( 참여 , 공유 , 개방 ).
  • Suggestions
    • Social network 은 complex systems 의 전형적인 예 중 하나다 . Complex network 의 창발성을 활용하자 !
    • 공공캠페인을 위해 Worldwide Web, Blogosphere 등을 적극적으로 활용하자 !
    • Diffusion of Buzz: 매력적인 바이러스를 만들자 !
    • ‘ Information Cascade’ 를 이끌어내자 !
    • 허브와 커넥터를 공략하자 !
    • ‘ 약한 유대의 힘’을 활용하자 !
    • 자발적인 참여 , 공유 , 개방을 활용하자 !