Then we construct some families of almost difference sets by means of group, cyclotomic class and direct product; 第二部分用群、分圆类以及直积的方法构作了几类几乎差集(ADS);
For its close relation to cryptography, coding theory and sequences, almost difference sets have attracted many scholars ' attention. 由于几乎差集(ADS)与密码学、编码理论和序列设计有密切联系,它引起了不少学者的关注。
In the third section, we construct two new families of almost difference sets by using cyclotomy modulo pq, where p and q are distinct primes; 第三部分利用模pq(p,q为互异素数)分圆类构造了两类新的几乎差集(ADS);
In the second section, we discuss the possibility of constructing almost difference sets with 2, 4 and 6 order cyclotomy classes; 第二部分就2阶、4阶及6阶分圆类可能构成几乎差集(ADS)的情形给于讨论;