In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When ...In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When these arbitrary functions are taken as some special functions, these solutions possess abundant structures. These solutions contain soliton-like solutions and rational solutions.展开更多
The threshold group signature is an important kind of signature. So far, many threshold group signature schemes have been proposed, but most of them suffer from conspiracy attack and are insecure. In this paper, a sec...The threshold group signature is an important kind of signature. So far, many threshold group signature schemes have been proposed, but most of them suffer from conspiracy attack and are insecure. In this paper, a secure threshold group signature scheme is proposed. It can not only satisfy the properties of the threshold group signature, but also withstand the conspiracy展开更多
In this paper, we are concerned with the boundedness of all the solutions ofthe equation x' + ax^+ - bx^- + φ(x) = p(t), where p(t) is a smooth 2π-periodic function, a and bare positive constants, and the pertur...In this paper, we are concerned with the boundedness of all the solutions ofthe equation x' + ax^+ - bx^- + φ(x) = p(t), where p(t) is a smooth 2π-periodic function, a and bare positive constants, and the perturbation φ(x) is bounded.展开更多
文摘In this paper, two (3+1)-dimensional equations are investigated. A uto-Backlund transformation is obtained,which is used with some ansatze to seek new types of exact solutions including some arbitrary functions. When these arbitrary functions are taken as some special functions, these solutions possess abundant structures. These solutions contain soliton-like solutions and rational solutions.
基金Supported in part by the National Natural Science Foundation of China under the Grant 60172060
文摘The threshold group signature is an important kind of signature. So far, many threshold group signature schemes have been proposed, but most of them suffer from conspiracy attack and are insecure. In this paper, a secure threshold group signature scheme is proposed. It can not only satisfy the properties of the threshold group signature, but also withstand the conspiracy
文摘In this paper, we are concerned with the boundedness of all the solutions ofthe equation x' + ax^+ - bx^- + φ(x) = p(t), where p(t) is a smooth 2π-periodic function, a and bare positive constants, and the perturbation φ(x) is bounded.
