1. Background

Key words of "Complex system"
"Fractals"(Mandelbrot,1984)
"Self Organized Criticality" 
             (Bak et al., 1988) 
"Chaos" (Lorenz, 1993),

New strategies using computer 
"Cellular Automata" (CA) 
"Monte-Carlo Simulations"

In Biology
"Game of Life" (Conway,1970) 
                              <upper right> 
"Boid" (Raynords, 1987) 
                              <lower right> 
"Simple rules create complicated 
  but fascinating results!"

** We used two program languages on our PCs; 
1) N88BASIC,a BASIC language run on Japanese 
  domestic PC, NEC-PC9800 series. 
2) C language on Linux operation system on 
  IBM-PC compatibles.