T recent financial crisis highlights the importance of market crashes and the subsequent market illiquidity for optimal portfolio selection. We propose a tractable and flexible portfolio choice model where market crashes can trigger switching into another regime with a different investment opportunity set. We characterize the optimal trading strategy in terms of coupled integro-differential equ...

This brief article reviews the important advances in the field of flow control that took place during the past few years. This broad area of research remains of great interest for its numerous potential benefits for both the military and civilian sectors. Spurred by the recent developments in chaos control, microfabrication and neural networks, reactive control of turbulent flows is now in the ...

The control of tokamak fusion experiments is outlined with particular reference to the evolution of the control from primitive pre-programmed operation, through to feedback control of many parameters, finally developing advanced methods which are destined to optimise the performance of the tokamak plasma. Four examples of enhanced control of tokamak plasmas are given.