Todays model-based dynamic positioning (DP) systems require that the ship and thruster dynamics are known with some accuracy in order to use linear quadratic optimal control theory. However, it is diicult to identify the mathematical model of a dynamically positioned (DP) ship since the ship is not persistently excited under DP. In addition the ship parameter estimation problem is nonlinear and...

Shipboard ventilation systems supply and remove air to/from spaces throughout the ship. In doing so, these systems control quality of breathing air and protect personnel and sensitive equipment from potentially hazardous airborne contaminants, fires, explosions, and excessive heat. The ability of ventilation systems to protect personnel from these hazards is particularly important aboard Navy s...

Ships play the major role in bulk transportation and they need their special energy system. This paper proposes a stochastic programing method for optimal sizing of a hybrid ship power system with energy storage system (ESS), photovoltaic power (PV) and diesel generator. To account for uncertainties, in this study a two-stage stochastic mixed-integer non-linear programing is used to model the o...

Compared to more conventional ships, little attention was given to nonlinear control design for ships sailing by the wind. Following our previous work, this paper addresses the issue of trajectory and reference input generation for a model that imitates the general behavior of sailing vessels. Specifically, we consider the generation of paths to perform a wearing maneuver. A feedforward control...

This paper discusses maritime traffic management in the boarding process of pilots when approaching a port. For efficiency reason ships are brought as close together and as close to shore as possible. For safety reason ships should remain well separated from each other and at a safe distance from shore. By realising a clear traffic structure the shore-based pilot maintains situation awareness a...

In current remote sensing literature, the problems of sea-land segmentation and ship detection (including in-dock ships) are investigated separately despite the high correlation between them. This inhibits joint optimization and makes the implementation of the methods highly complicated. In this paper, we propose a novel fully convolutional network to accomplish the two tasks simultaneously, in...

This paper describes two new methods for testing and measuring moral hazard that are applicable to a variety of insurance settings where panel data is available. The methods are able to measure moral hazard separately from adverse selection. The first method uses the variation in risk over different objects with different levels of insurance owned by the same person to isolate the average effec...

BACKGROUND Over 2300 merchant seafarers are currently employed on board UK Royal Fleet Auxiliary (RFA) ships. However, little is known about work related mortality among these seafarers, and whether it is lower than among seafarers in merchant fleets. OBJECTIVES To establish the causes and circumstances of all work related deaths among seafarers who were employed in RFA ships from 1976 to 200...