Group trust model in P2P network
最优非单位步长无向双环网络G(N;±r,±s)的构造*

This paper presented a new method to research diameter and average diameter of the bidirectional double-loop networks G(N;±r,±s) based on cartesian coordinates which had been creatively used in the research. Using this method, gave the limited bound of average diameter. Based on these research, gave the definition of the best bidirectional double-loop networks Best G(N;±r,±s) whose diameter and average diameter were both lowest and also studied the relationship between diameter and step s. At last,we give the simulation of the graph of the best bidirectional double-loop networks Best G(N;±r,±s) for any given diameter. Compared whith L-shaped tile simulation which could not be used in the bidirectional double-loop networks directly, this method improved the research level of the bidirectional double-loop networks greatly.