Collaborative and distributed applications, such as dynamic coalitions and virtualized grid computing, often require integrating access control policies of collaborating parties. Such an integration must be able to support complex authorization specifications and the fine-grained integration...

This article aims to gain a better understanding of the capacity of China to feed its growing population given its limited natural resources, and the impact of China's growing economy on rest of the world and vice versa. In order to reflect China's real food economy and reasonable assumptions,...