Zhengjiang Liu

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International Maritime Organization (IMO) implements the principles of risk management through a systematic process called Formal Safety Assessment (FSA). FSA is a structured and systematic methodology, aimed at enhancing maritime safety, including protection of life, health, the marine environment and property, by using risk analysis and cost benefit(More)
A novel output feedback strategy is presented for the berthing control of underactuated surface ships with nonintegrable acceleration constraint. Saturations on actuators, systemic uncertainties and drift caused by current or wind are considered. The problems of trajectory planning and tracking are circumvented by means of iterative nonlinear sliding mode(More)
For a class of nonlinear systems in a semistrict feedback form with both parametric uncertainty and unknown nonlinearities, a new control design scheme based on backstepping approach is proposed. The Nussbaum gain technique is used as a robust control term to deal with unknown nonlinearities for the first time. This gives a continuous control, in contrast(More)
A recurrent wavelet neural network (RWNN) is introduced to realize identification and control of system with time delay. The identification is based on model type of nonlinear auto-regressive with exogenous inputs (NARX). The method incorporates the delayed massage of the system, the resulting model can give predictions to the object system. The(More)
—In order to process the uncertainty information in assessing human element, in this paper, a synthetic assessment method is proposed to seafarers' competency based on cloud models, where various uncertainties in the system are well kept and modeled by cloud theory. The presented approach focuses on effectively modeling the quantitative and qualitative(More)