Tierra-based space system for robustness of bit inversion and program evolution

This paper proposes the system that evolves to a better program by regarding a bit inversion caused by radiation as a chance of the mutation in program, and verifies the effectiveness of the proposed system by improving Tierra, digital life simulation for investing biological evolution. Concretely, the program improves to (1)achieve the goal received the outside from Tierra whose the goal is fixed as self-reproduction of the living thing, and (2)to introduce the mechanism that controls the reproduction and the lifespan of the program is added according to the goal achievement degree. As a result, a normal program was normal, and the program including a bug became normal.