摘要：This paper describes a new interleaver construction technique for turbo code. The technique searches as much as possible pseudo-random interleaving patterns under a certain condition using genetic algorithms(GAs). The new interleavers have the superiority of the S-random interleavers and this interleaver construction technique can reduce the time taken to generate pseudo-random interleaving patterns under a certain condition. The results obtained indicate that the new interleavers yield an equal to or better performance than the S-random interleavers. Compared to the S-random interleaver, this design requires a lower level of computational complexity. Key words interleaver - Turbo codes - genetic algorithm CLC number TN 911. 22 Foundation item: Supported by the National Natural Science Foundation of China (60372057) and the Key Open Laboratory on Information Science and Engineering of Railway Transportation Ministry of Beijing Jiaotong University of China (KLISAE-0103)Biography: Tan Ying (1963-), female, Associate professor, Ph. D, research direction: error control coding, analysis and design of wireless communication system.

摘要：为了研究不同断奶模式对甘南犊牦牛生长发育的影响,本试验采用单因素方差试验设计,共选取90头体重相近(11.34±1.62)kg犊牦牛作为试验对象,随机分为3组,自然放养组(对照组)、3月龄断奶组(试验1组)、6月龄断奶组(试验2组),每组30头,公母各半,试验周期7个月,在犊牛初生期、4月龄、7月龄分别进行体重、体高、体长、胸围指标进行测定。研究结果表明,采用早期断奶的犊牦牛生长发育状况优于传统饲养模式,有效提高了犊牛的生长性能,是一项可以推广的有效饲养模式。