In this paper, the sensing coverage area of surveillance wireless sensor networks is considered. The sensing coverage is determined by applying the Neyman-Pearson detection model and defining the breach probability on a gridmodeled field. Using a graph model for the perimeter, Dijkstra’s shortest path algorithm is used to find the weakest breach path. The breach probability is linked to paramet...

Metastasis is initiated in epithelial-derived tumors when cells at the tumor front breach the epithelial basement membrane (BM). Invasion through BMs is thought to be one of the most rate-limiting steps in cancer progression and thus is a therapeutically attractive target for halting tumor spread. Despite intense interest, it has been challenging to experimentally determine how invasive cells b...

Knowledge workers are gradually becoming the most valuable and productive part of employees, but their intrinsic characters lead to their high turnover rate. As viewed from the theory of psychological contract, this article analyzes the flow process of knowledge workers, establishes the employee satisfaction model and finds out that one important reason inducing knowledge workers’ high turnover...