Analysis of Collision Avoiding Action of Ship : From Viewpoint of Man-Machine-System Analysis

Abstract

As a basic study on the marine traMc control and development of navigation system ， we must khow real manouevering of ships ． Using by Ship Manouevering Simulator ， authors have studied the handling of coUision avoidance which is one of man − machine system ， s problems ． We have 皿 ade out the foUowing matter through the simulator study under the variable conditions of encounters between ships ． In the 丘rst place ， navigator makes

On a Method to Detect the Dynamic Hotspot

“…In applying factor analysis, we assumed that each risk index evaluates the mixture of various aspects of risk, and this mixing ratio varies depending on the method. This assumption seems to be appropriate, for example, it can be said that "CJ" method [2] tends to evaluate the degree of difficulty of risk avoidance because this evaluation formula contains explicitly the term related to difficulty of risk avoidance. Under this assumption, factors in factor analysis correspond to each aspect of risk.…”

Error Detection in the Navigational Watch Based on the Behavior Analysis of Navigators

“…Therefore, in this study, we used a subjective risk assessment index (Hara 1990, Nakamura 1996 focusing on rate of relative bearing change of a target ship to define whether the ship had risk of collision. The subjective risk assessment index was designed based on encounter situations of multiple ships, while the other indexes, such as the Collision Judgment threshold value (CJ-value) (Kobayashi 1976), the Subjective Judgment value (SJvalue) (Hara 1995), and the Obstacle Zone by Targets (OZT) (Imazu 2002), were designed based on one-toone encounter situations.…”