By improved projective equation approach and a linear variable separation approach, a new family of exact solutions of the (2+1)-dimensional Boiti-Leon-Pempinelli (BLP) system is derived. Based on the derived sol...By improved projective equation approach and a linear variable separation approach, a new family of exact solutions of the (2+1)-dimensional Boiti-Leon-Pempinelli (BLP) system is derived. Based on the derived solitary wave solution, some dromion and solitoff excitations and chaotic behaviours are investigated.展开更多
BLP(Bell&LaPadula)模型是用来在计算机系统内实施多级安全政策和自主安全政策的一种访问控制模型。本文将系统时间看成一个基本的安全要素,提出了带时间特性的BLP模型(BLP with Time Character:记为BLP—T),并将之形式化。BLP—T...BLP(Bell&LaPadula)模型是用来在计算机系统内实施多级安全政策和自主安全政策的一种访问控制模型。本文将系统时间看成一个基本的安全要素,提出了带时间特性的BLP模型(BLP with Time Character:记为BLP—T),并将之形式化。BLP—T解决了主客体安全标记随时间的变化问题,以及主体可自主地决定其他的哪些主体可以在何时访问他拥有的客体。最后,将BLP—T应用于Linux,得到了一个原型。实验证明,该原型可以实现主客体安全标记时间特性、主体对客体的时间约束。BLP—T使得BLP模型呈现出环境敏感性。展开更多
基金Project supported by the Natural Science Foundation of Zhejiang Province of China (Grant Nos. Y6100257, Y6110140, and Y6090681)the Natural Science Foundation of Zhejiang Lishui University, China (Grant Nos. KZ09005 and KY08003)
文摘By improved projective equation approach and a linear variable separation approach, a new family of exact solutions of the (2+1)-dimensional Boiti-Leon-Pempinelli (BLP) system is derived. Based on the derived solitary wave solution, some dromion and solitoff excitations and chaotic behaviours are investigated.
文摘BLP(Bell&LaPadula)模型是用来在计算机系统内实施多级安全政策和自主安全政策的一种访问控制模型。本文将系统时间看成一个基本的安全要素,提出了带时间特性的BLP模型(BLP with Time Character:记为BLP—T),并将之形式化。BLP—T解决了主客体安全标记随时间的变化问题,以及主体可自主地决定其他的哪些主体可以在何时访问他拥有的客体。最后,将BLP—T应用于Linux,得到了一个原型。实验证明,该原型可以实现主客体安全标记时间特性、主体对客体的时间约束。BLP—T使得BLP模型呈现出环境敏感性。