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Background
The World Health Organization (WHO) Surgical Safety Checklist has fostered safe practice for 10 years, yet its place in emergency surgery has not been assessed on a global scale. The aim of this study was to evaluate reported checklist use in emergency settings and examine the relationship with perioperative mortality in patients who had emergency laparotomy.
Methods
In two multinational...
This paper introduces an extension to continuous time model predictive control to take care of time varying systems by adopting a tube-based approach. The proposed controller can be formulated as a multi-parametric quadratic program that can be solved offline. Therefore, the computational time is reduced. The proposed controller is used to control the pitch angles of large wind turbines in order to...
Control of collective pitching for large wind turbines is considered. This paper introduces two main contributions: 1) the design of explicit model predictive control with time varying constraints on boundaries of and limits on the rate of change of the control action and 2) the application of the developed explicit model predictive control for the collective pitch control in large wind turbines....
This paper proposes a new fuzzy predictive algorithm for collective pitch control of large wind turbines. Collective pitch controllers operate in region three to harvest the rated power and maintain the rated speed. The wind turbine model is represented by a Takagi–Sugeno (T–S) fuzzy model. The number of T–S fuzzy rules is reduced based on a gap – metric criterion. A model predictive controller is...
This paper proposes a new design of a fuzzy predictive controller for collective pitching of large wind turbines. Collective pitch controllers operate in region three to harvest the rated power and maintain the rated speed. The wind turbine model is represented by a Takagi-Sugeno (T-S) fuzzy model. A model predictive collective pitch controller is designed based on the fuzzy model taking into consideration...
This paper proposes the design of a fuzzy collective pitch controller (CPC) for large wind turbines. Two types of fuzzy controller are introduced. The design of these controllers relies on the linear matrix inequality (LMI). The performance of the proposed fuzzy controller is compared with a polytopic uncertain controller as found in the literature. The comparison reveals that the proposed controller...
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