The attribute access methods of MAC layer in wireless communication network is researched. Aiming at conquering the problem of the shared ZigBee wireless channel resulting multi-channel device conflicts when using the data channel at the same time, therefore the protocol is improved and a method used to access the properties of ZigBee is proposed, and this method can be achieved to manage effec...

Many computational settings are concerned with finding (all) models of a first-order logic theory for a fixed, finite domain. In this paper, we present a method to compute from a given theory and finite domain an approximate structure: a structure that approximates all models. We show confluence of this method and investigate its complexity. We discuss some applications, including 3-valued quer...

In this paper, by using the improved ( ′ G )-expansion method, we have successfully obtained some travelling wave solutions of the variant Boussinesq Equations. These exact solutions include the hyperbolic function solutions, trigonometric function solutions and rational function solutions. Mathematics Subject Classification: 35Q58; 37K50

Stochastic reaction networks are a fundamental model to describe interactions between species where random fluctuations relevant. The master equation provides the evolution of probability distribution across discrete state space consisting vectors population counts for each species. However, since its exact solution is often elusive, several analytical approximations have been proposed. determi...

In this paper it is shown that the inaccuracy in the beam propagation method based on the finite difference scheme, introduced by the use of the slowly varying envelope approximation, can be overcome in an effective way. By the introduction of a perturbation expansion the accuracy can be improved as much as wanted, often nearly without any increase of the computation time. An error analysis is ...

OBJECTIVE To analyze the expansion of nursing roles in primary care in the English National Health Service and the implications for professional practice. METHOD qualitative research in case study format, held in London, England, in six primary care units. Data were obtained through interviews with nine nurses. After the thematic data analysis, two units emerged: the nurses' performance chara...