Efficacy and safety of Cohen Flex-Tip blocker and left double lumen tube in lung isolation for thoracic surgery: a randomized comparative study
Background ::: The Cohen blocker is one of the lung isolation devices. Unfortunately, most anesthesiologists believe that its efficacy in inducing lung collapse is less than that of the double-lumen tube (DLT). This study has been performed to compare the adequacy of lung collapse and the adverse effects between the Cohen blocker and the left DLT for thoracic operations.
Wind farms in a competitive electricity market may suffer from economic losses due to the intermittent nature of wind power. This paper proposes a solution by establishing direct trade between a wind farm and a flexible load. Unlike traditional cooperation scheme, the benefits of wind farm and flexible load are considered individually. Each participant of the trade considers the other's reaction to its decision and adjust its strategy until both sides are satisfied. Uncertainties of wind power generation, energy market prices, and the rest loads are considered. To solve the model, L-shaped method and Lagrangian Relaxation are adopted to decompose the problem. Study cases show that the revenue of the wind farm and the cost of the flexible load can be improved compared with the case when there is no direct trade.