This paper presents full scale test results and discusses the effectiveness of three different highly skewed propeller designs in reducing ship “ibrati on. The test results cover three merchant ship designs, including one OBO vessel and two RO/RO vessels, having installed horsepower rangj.ng from 24,000 to 37,000 SHP. Limited discussion is presented on the relative effectiveness of installing a...

A control system is proposed for the regulation problem of the roll-motion of a manned sea-surface vehicle. Taking into account the roll-ship equations coming from the Conolly theory, a novel stochastic model has been proposed for the uncertainties driving the total mechanical torque acting on the vehicle, deriving from the wind and/or the sea-wave action. The proposed model results in a biline...

In the past, Concept Exploration was the first step in defining the properties of a ship. Of the many ships studied during Concept Exploration, one was to be further developed and refined by the government during preliminary and contract design. Following award of the detail design and construction contract, a shipyard would complete the design and construct the ship. With the advent of Acquisi...

The application of strengths, weaknesses, opportunities and threats (SWOT) analysis to formulation of strategy concerned with the safe carriage of bulk liquid chemicals in maritime tankers was examined in this study. A qualitative investigation using SWOT analysis has been implemented successfully for ships that are designed to carry liquid chemicals in bulk. The originality of this study lies ...

This paper presents an efficient method for ship target segmentation in infrared (IR) images. It consists of mainly two procedures: iterative image segmentation and ship target selection. First, based on the intensity distribution of an IR image, we design a global background subtraction filter (GBSF) to suppress the background, and an adaptive row mean subtraction filter (ARMSF) to enhance the...

This paper investigates an initiative by a New Zealand School to integrate one-to-one ICTs into the learning process, called ‘bring your own device’ (BYOD). Prior to embarking on the BYOD initiative, similar past initiatives have been studied and some persistent issues have been identified. Before starting with the detailed investigation of BYOD, a preliminary analysis of the public response da...

The ship design activity often requires handling and storage of large amounts of data related to different systems inside the vessel, demanding for a structured way to organize it. This article suggests an objectoriented approach to handle virtual prototyping data during conceptual ship design. We start presenting some of the basic concepts related to objects, such as name, property and value. ...

Dynamic programming (DP) is a useful tool for solving many control problems, but for its complexity in computation, traditional DP control algorithms are not satisfactory in fact. So we must look for a new method which not only has the advantages of DP but also is easier in computation. In this paper, approximate dynamic programming (ADP) based controller system has been used to solve a ship he...

Introduction The conditions under which naval medical officers have to work in action differ so widely from any they can have encountered in other practice, that even a rough account of actual experiences may prove of interest. These vary so greatly in every type of ship according to the accommodation, the facilities available and the proportion of casualties that the following notes must be co...