1.K.Hashimoto and T.Ikegami, Heteroclinic Chaos, Chaotic Itinerancy and Neutral Attractors in Symmetrical Replicator Equations with Mutations (ps.gzip file)(submitted to j. Phys. Soc. Japan. 2000). 2.I.Igari and T.Ikegami, Coevolution of Mind and Language. (submitted to the int'l conf. on Evolution of Language. (ps.gzip file)(Paris, April, 2000). 3.K.Harada and T.Ikegami, Evolution of Specificity in an Immune Network j. theor.biol. 203 (2000) 439--449. 4.Ikegami, T. Evolvability of Machines and Tapes, (ps.gzip file)J. Artificial Life and Robotics vol. 3 No. 4 (1999) pp.242--245. 5.Ikegami, T. Taiji, M. Imitation and Cooperation in Coupled Dynamical Recognizers (ps.gzip file) 545--554. Advances in Artificial Life ( eds. Floreano,D. et al., Springer-Verlag, 1999). 6.Taiji, M. and Ikegami, T. Dynamics of internal models in game players Physica D, 134, 253--266. 1999. 7.Harada,K., Ikegami,T. Evolution of Multispecificity in an Immune Network (eds. Floreano,D. et al.) 427--431. Advances in Artificial Life (Springer-Verlag) 1999. 8.Ono, N. and Ikegami, T. Model of Self-Replicating Cell Capable of Self-Maintenance (eds. Floreano,D. et al.) 399--406. Advances in Artificial Life (Springer-Verlag) 1999. 9.Sato, Y., M.Taiji and T.Ikegami NP-completeness of kSAT and multifractals Computer Physics Comm. 121-122(1999) 51-53. 10.Sato, Y. and Ikegami, T. Undecidability of the Imitation Game (eds. Dautenhahn et al.) 157--159. Imitation in Animals and Artifacts in the Proceedings of the AISB '99 Symposium (publ. The society for the study of Artificial Intelligence and Simulation Behavior) 1999.
1.K.Hashimoto and T.Ikegami, Heteroclinic Chaos, Chaotic Itinerancy and Neutral Attractors in Symmetrical Replicator Equations with Mutations (ps.gzip file)(submitted to j. Phys. Soc. Japan. 2000). 2.I.Igari and T.Ikegami, Coevolution of Mind and Language. (submitted to the int'l conf. on Evolution of Language. (ps.gzip file)(Paris, April, 2000). 3.K.Harada and T.Ikegami, Evolution of Specificity in an Immune Network j. theor.biol. 203 (2000) 439--449. 4.Ikegami, T. Evolvability of Machines and Tapes, (ps.gzip file)J. Artificial Life and Robotics vol. 3 No. 4 (1999) pp.242--245. 5.Ikegami, T. Taiji, M. Imitation and Cooperation in Coupled Dynamical Recognizers (ps.gzip file) 545--554. Advances in Artificial Life ( eds. Floreano,D. et al., Springer-Verlag, 1999). 6.Taiji, M. and Ikegami, T. Dynamics of internal models in game players Physica D, 134, 253--266. 1999. 7.Harada,K., Ikegami,T. Evolution of Multispecificity in an Immune Network (eds. Floreano,D. et al.) 427--431. Advances in Artificial Life (Springer-Verlag) 1999. 8.Ono, N. and Ikegami, T. Model of Self-Replicating Cell Capable of Self-Maintenance (eds. Floreano,D. et al.) 399--406. Advances in Artificial Life (Springer-Verlag) 1999. 9.Sato, Y., M.Taiji and T.Ikegami NP-completeness of kSAT and multifractals Computer Physics Comm. 121-122(1999) 51-53. 10.Sato, Y. and Ikegami, T. Undecidability of the Imitation Game (eds. Dautenhahn et al.) 157--159. Imitation in Animals and Artifacts in the Proceedings of the AISB '99 Symposium (publ. The society for the study of Artificial Intelligence and Simulation Behavior) 1999.
11.T.Ikegami and M.Taiji Structures of Possible Worlds in a Game of Players with Internal Models (ps.gzip file) Acta Polytechnica Scandinavica Ma. 91(1998)pp.283-292. 12.M.Matsushima and T.Ikegami, Evolution of Strategies in the Iterated Prisoner's Dilemma Game journal of theoretical biology 195 (1998) 53--67. 13.S.I.Nishimura and T.Ikegami, Emergence and Maintenance of Relationships among Agents in Artificial Life VI (eds. C. Adami, R. Belew, H. Kitano and C. Taylor, MIT Press, 1998) pp. 438--442. 14.S.I.Nishimura, and T.Ikegami, Emergence of Collective strategies in a prey-predator game model Artificial Life Journal Vol. 3(4) 243--260, 1998. 15.Ono, N. and Ikegami, T., Model of self-replication cell capable of self-maintenance. , will appear in Proc. of ECAL99, 1999. 16.Nishimura, S. I. and Ikegami, T., Emergence and maintenance of relationships among agents in Proc. of "Artificial Life VI", Los Angeles, C. Adami, R. Belew, H. Kitano, and C. Taylor, eds., 438--442, MIT Press, 1998. 17.Nishimura, S. I. and Ikegami, T., Emergence of Collective strategies in a prey-predator game model, Artificial Life Journal Vol. 3(4) 243--260, 1998. 18.Sato,Y., Taiji,M., Ikegami,T, Self-similar sets as satisfiable Boolean expressions to appear in the Proceedings of the 1st International conference on Unconventional Models of Computation 1998. 19.Ikegami,T., Hashimoto,T., Replication and Diversity in Machine-Tape Coevolutionary Systems (ps.gz.file) Artificial Life V (eds. C.Langton and K.Shimohara, MIT press) pp.426--433. 1997 20.Takashi Ikegami, Origins of Diversity and Evolution in Game Systems Computer Software(in Japanese), vol.16, No. 14 pp.13--18. 1997
21.Takashi Ikegami Self-reproduction adn Mutation as Computational Processes Computer Today(in Japanese), No.82. pp.14--23. 1997 22.Takashi Ikegami Self-reproduction and Mutation in Machines and Tapes Genetic Algorithm 3(in Japanese) (ed. Hiroaki Kitano, Sangyou-Publ.)pp.337--362. 1997 23.Takashi Ikegami Coevolution of Hosts and Parasites Mathematical Biology(in Japanese) (ed. Yoh Iwasa, Kyouritu-publ.) pp. 106--120. 1997 24.T. Ikegami and T. Hashimoto, Coevolution of Machines and Tapes Artificial Life 2 pp. 305--318. 1996 25.T. Hashimoto and T. Ikegami, Emergence of Net-grammar in Communicationg Agents BioSystems 38 pp.1--14. 1996 26.T.Ikegami, Games and Chaos in Sciences of Self-Organization (in Japanese) (ed. S.Kitamura et al. Ohm Publ.,) Chapter 6. 1996. 27.T.Ikegami and T.Hashimoto, Coevolution of Machines and Tapes Advances in Artificial Life ( eds. F.Moran et al., LNAI 929). pp.234--254. 1995, 28.T.Ikegami and E.S.Yoshikawa, Chaos and Evolution of Cooperative Behavior in a Host-parasite Game in Towards the Harnessing of Chaos (ed. M.Yamaguchi, Springer)pp.63--72. 1995. 29.Takashi Ikegami, Evolution and Creative Bugs, Kagaku(in Japanese) 64 pp.153--161. 1994. 30.T.Ikegami, From Genetic Evolution to Emergence of Game Strategies Physica D 75, pp.310--327. 1994
31.Takashi Ikegami Chaos, Evolution and Game, in Artificial Life (in Japanese) (ed. ALIREN, Kyouritu-Publ.)Chapter 3. 1994. 32.T.Ikegami, Ecology of Evolutionary Game Strategies the proceedings of international symposium on European Conference for Artificial Life(May, Brussels). 1993. 33.T.Ikegami and K.Kaneko, Evolution of Host-parasitoid network through Homeochaotic Dynamics, CHAOS 2 pp.397--408. 1992. 34.K.Kaneko and T.Ikegami, Homeochaos: Dynamical stability of Symbiotic Network with Population Dynamics and Evolving Mutation Rates, Physica D 56 pp.406--429. 1992. 35.T.Ikegami and I.Tsuda, Measuring Complexity : A relative aspect of pattern recognition Int'l. J. Mod. Phys. C 3 pp.447-458. 1992. 36.T.Ikegami and K.Kaneko, Genetic Fusion Phys. Rev. Lett. 65 pp.3352-3355. 1990 37.T.Ikegami and K. Kaneko, Computer Symbiosis--- Emergence of Symbiotic Behavior Through Evolution, Physica D 42 pp.235--243. 1990 38.T.Ikegami, Dynamical Behaviors of the Immune Network, Prog.Theor.Phys. 81 pp.309--320. 1989 39.T.Ikegami and M.Suzuki, Spatio-Temporal Patterns of a Plastic Network System, Prog.Theor.Phys. 78 pp.38--50. 1987.
Takashi Ikegami The Graduate School of Science and Technology, Kobe University, Rokkodai, Nada-ku, Kobe 657, Japan
Kunihiko Kaneko Institute of Physics, College of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan
Received 25 June 1990
Genetic fusion is introduced as a model for evolution. In the fusion two genomes are combined to generate a longer genome. Representing each species by a binary genetic sequence, we introduce a fitness function on the bit sequence. As the evolutionary dynamics, we incoroporate mutation, genetic fusion, and reproduction in proportion to fitness. It is found that genetic fusion leads to the appearance of module-type sequences and duplicated genes. The time necessary to find a sequence with large fitness is largely reduced by the inclusion of genetic fusion, which suggests the application of our algorithm to optimization problems.