Joo-Sung Kim

Mokpo National Maritime University · Department of Navigation Science

The increasing need for water-based navigation has created a strong demand for maritime autonomous surface ships (MASS). In particular, research in the fields of path planning, autonomous navigation, and collision avoidance has started to become increasingly relevant for maritime transport. The use of artificial intelligence (AI) for the developmen...

Existing route-clustering methods often fail to identify abnormal sections or similarities between routes, mainly when working with large or long datasets. While sub-route clustering can detect regional patterns, it struggles to accurately capture the overall route structure. The present study proposes a new ship route-clustering method that enhanc...

Anchor dragging at anchorages poses a significant threat to marine traffic, potentially leading to collisions and damage to seabed infrastructure. This study analyzed a large dataset of ships in anchorage areas to develop a machine learning (ML) model that estimates the risk of anchor dragging using a binary classification system that differentiate...

Map space composition is the first step in ship route planning. In this study, a map modeling method for path planning is proposed. This method incorporates the safety margin based on the theory of geographic space existing in coastal waters, maneuvering space according to ship characteristics, and the psychological buffer space of a ship navigator...

Ship route planning is a crucial activity that must consider not only the safety of the ship but also the safe passage of nearby ships in the same space and time. This study aims to provide general route-planning guidance to shipping traffic by improving conventional sampling-based route-planning algorithms in accordance with the maritime environme...

Vessel Traffic Services (VTS) operators perform traffic management tasks using VTS systems and sensor equipment designated as VTS facilities to promote the safety and efficiency of vessel traffic. The necessary VTS information for effective operations could be obtained through the additional access of various information channels other than the des...

Recognizing dangerous situations in advance and determining priority is essential in vessel traffic surveillance. The traffic management priority is determined by the vessel traffic service operator (VTSO) employing the closest point of approach (CPA) and the time to CPA (TCPA) of the targets considering their current navigational data. Various env...

To reduce the risk of collision in territorial sea areas, including trade ports and entry waterways, and to enhance the safety and efficiency of ship passage, the International Maritime Organization requires the governing body of every country to establish and operate a vessel traffic service (VTS). However, previous studies on risk prediction mode...

A round bilge with a bilge keel structure is a key element which can alleviate roll motions of ships and floating structures by transferring the roll momentum of a floating body into the kinetic energy of water. This study presents a practical guide to properly designing a bilge radius and bilge keel height of a barge-shaped and tanker-shaped FPSOs...

Maritime autonomous surface ships (MASS) need to be sufficiently safe to gain commercial acceptance. Collision avoidance strategies in such MASS should comply with the International Regulations for Preventing Collision at the Sea (COLREGs). According to the COLREGs, collision risk assessment, which determines the optimal positioning and timing via...

A vessel must navigate along designated routes within a harbor area to ensure navigation safety. The impact of strong currents is one of the most dangerous factors in coastal navigation. However, it is challenging to determine the deviation of a ship in advance from the ship's position data in the case of a marine accident. In this study, to suppor...

Wind load is one of the major design loads for the hull and mooring of offshore floating structures, especially due to much larger windage area above water than under water. By virtue of extreme design philosophy, fully turbulent flow assumption can be justified and the hydrodynamic characteristics of the flow remain almost constant which implies t...

The judgement of Collision Risk Index (CRI) is important for safe navigation. The autonomous ship need to analyze and decide taking an action for collision avoidance. Recently, it has been possible of navigator to obtain navigation information in real time. By using such collected navigation information, many researchers have proposed inference mod...

The identification of anomalous behavior of own vessel and its targets is one of the most important task to ensure safety of navigation. In particular, it is essential to determine the anomalous behavior of a ship in the decision-making process. The existing anomalous behavior detection method defines the anomalous behavior by judging the abrupt ch...

The existing vessel trajectory analysis methods have used to learn the trajectory based on the accumulated navigational data only. However, the influence of external forces, such as tidal steam and current, should be taken into account in the navigational environment elements as well as the designated traffic route and geography. Therefore, in this...

A person who has responsible for ship's safety, such as captain and Vessel Traffic Service Operator (VTSO), should make a decision to prevent the ship from colliding or other accident related on traffic situation. At this time, the positions of the own ship and the opponent ship are used for identification and prediction of the future situation, an...

Vessel Traffic Services operators have kept sharp monitoring and provided the appropriate information to ensure safe and effective navigation. While attending the tasks, analysis of traffic patterns and navigational data is required to conduct accurate situation assessment in decision-making process of VTS operators (VTSO). Unfortunately, there are...

A ship’s sailing route or plan is determined by the master as the decision maker of the vessel, and depends on the characteristics of the navigational environment and the conditions of the ship. The trajectory, which appears as a result of the ship’s navigation, is monitored and stored by a Vessel Traffic Service center, and is used for an analysis...

Understanding a ship`s present position has been one of the most important tasks during a ship`s voyage, in both ancient and modern times. Particularly, a ship`s dead reckoning (DR) has been used for predicting traffic situations and collision avoidance actions. However, the current system that uses the traditional method of calculating DR employs...

Vessel Traffic Service (VTS) is being used at ports and in coastal areas of the world for preventing accidents and improving efficiency of the vessels at sea on the basis of "IMO RESOLUTION A.857 (20) on Guidelines for Vessel Traffic Services". Currently, VTS plays an important role in the prevention of maritime accidents, as ships are required to...

A prediction of vessels movements helps to improve safety of navigation. In an arbitrary water area, the prediction information of vessels to be encountered can be provided by observing inbound/outbound vessels for ports. This study proposes a prediction table representing leeway and arrival time at each waypoint. Given the table, the encounted ves...