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 paper analyzes the potential impacts of the Doha trade proposals (those of the USA, EU and G20) on agricultural production and incomes of China's farmers by region and income group. By linking a global trade model to a national policy model which itself is connected to a set of...