a kind of branching process were very d i f f i c u l t t o analyze due t o the nonl i n e a r i t y and t h e complexity t i l l recent developments of computer and anailyzi n g methods such a s f r a c t a l wavelet, c h a o t i c concepts e t c . a r e proposed, Uendrinos and Sonis [l], Xapitaniak [21 and Hoppensteadt 131. S . Fujimori. T . Endo, K . Mitsuboshi a r e i n The Department of E l e c t r i c a l Engineering, Tokai University, 1117 Kitakaname, Hiratsuka, Japan. K . Ishiwata, M . Akasaka and S . Hiruta a r e in The Knoor Food C o . , The Marzen Showa Unyu Co., and The Mitsubishi Pencil Co. i n Japan. 0-7803-2040-9/95/$4.00 0 I995 IEEE
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