acryptosystem of knapsack public-key.

In this paper a new knapsack public-key cryptosystem and a new secret sharing scheme,in which the builder needn t know the secrets suggested;then the security of the cryptosystem and the forms of the secret-key are analyzed,and finally the idea of Public-key cryptosystem on level of the algorithm is presented.

In this paper,we prove that the0/1balance knapsack module2 N is equivalent to the standard balance knapsack with its weignt matrix being upper triangle matrix,and its number equals to2 N(N-1)/2 N?.

Solving multidimensional 0-1 knapsack problem by hybrid particle swarm optimization algorithm;

An improved particle swarm optimization algorithm for knapsack problems;

Modified particle swarm optimization algorithm for knapsack problem;

This article introduces the concept of backpacker tourism and analyses the characteristics of backpacker tourism.

Through retrieving and analyzing English literature on backpacker tour ism, this paper summarizes the research results on backpacker tourism made by fo reign scholars from several main perspectives, such as the characters of backpac kers, their impact on tourist destinations and the attitudes of destination coun tries towards backpacker tourism.

Backpacker tourism has developed quickly in China.

Summary of Knapsack Problems Based on Particle Swarm Optimization;

Memetic algorithm is one of heuristic algorithms,it is more appropriate for multidimensional knapsack problems than some classical mathematical methods.