Chen Guolong1 Hu Zhiwen2 1 Dept. of Computer Sci. and Tech.; Huaibei Coal Industry Teachers College; Anhui; 235000 2 Key Laboratory of Ion Beam Bioengineering; CAS; 230031;

• 淮北煤炭师范学院计算机科学与技术系;中科院离子束生物工程学重点实验室安徽;