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How to Make an ABM

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Serial Talks on AgentAgent-Based Modeling
How to Make an ABM
Spoon Lee from NCCU
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Contents
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Review of Key Concepts пѓµ
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Dynamic Social Impact Theory пѓµ
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An ABM for DSIT пѓµ
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Next Steps пѓµ
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Ready to DIY ? пѓµ
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Review
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Key concepts
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Agent
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CAS
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Emergence
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Attractor…
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Complex global patterns emerge from simple local
interactions
Life Game пѓµ
Dynamic Social Impact Theory
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What is “Social Impact Theory”
Latane(1981) defines social impact as any
influence on individual feelings, thoughts, or
behaviors that is exerted by the real, implied,
or imagined presence or actions of others.
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Parameters
Impact = f ( S I N )
S -> strength of source (supportive vs. persuasive) F пЂЅ G m1m2
r2
I -> immediacy (as in Gravity equation)
N -> number of source -> i = k N t t=0~1 (about 0.5)
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ABM for DSIT
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Attitude -> binary
Strength
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Persuasiveness, p -> varies randomly
Supportiveness, s >varies randomly
Immediacy -> physical distance
Impact from others
п‚Ў Persuasiveness, ip
п‚Ў Supportiveness, is
Change criteria -> ip > is
Demonstration пѓµ
   Pi2  
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ip пЂЅ Np пѓЄ пѓЁ i пѓё пѓє
пѓЄ Np пѓє
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   S i2  
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is пЂЅ N s пѓЄ пѓЁ i пѓё пѓє
пѓЄ Ns пѓє
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ABM for DSIT
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Results
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Minority are never extinguished
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Minority survives in the peripheral area
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No complete bipolarization at all
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And then??
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Next Steps
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Finding the critical Control Parameters
-> Making a meeting for the two ends
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How to create more creative agents?
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Mobility of agents
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Flexibility of communication channels
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Emerging properties inside the agents’ “brains”
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How about some “education” or “learning”
Theoretical and practical values of ABM
Ready to DIY?
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A smart, clear, but storming brain!
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Programming tools
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OOP, object-oriented programming
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Flash MX 2004 professional
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Visual Basic, C++, Delphi…
Relevant sources
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Journal of Communication, 1996, 46(4)
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Psychological Inquiry, 1997, 8(2)
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Social Networks, 2000, 22,
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Personality and Social Psychology Review, 2002, 6(4)
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