• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.7
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• pp.1509-1513
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• 2003

The autopilot system of vessel is proposed to take service safety and security, to elevate service efficiency, to decrease labor and to improve working environment. Ultimate purpose of the proposed system is to minimize the number of crew by guaranteeing economical efficiency of shipping service. Recently, the research is being achieved to compensate various nonlinear parameters of vessel and apply it to course keeping control, track keeping control, roll-rudder stabilization, dynamic ship positioning and automatic mooring control etc. using optimizing control technique. Relation between rudder angle controlled by steering machine of vessel and ship-heading angle, and load condition of ship is nonlinear, which affects various parameters of shipping service. The speed and direction of waves, velocity and quantity of wind, which also cause the non-linearity of it. Therefore the autopilot system of ship requires the robust control algorithm can overcome various non-linearity. On this paper, we design the autopilot system of ship, which overcomes nonlinear Parameters and disturbance of it using Fuzzy Algorithm, evaluate the proposed algorithm and its excellence through simulation.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.353-354
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• 2018

스웰 등 장주기파랑은 높은 에너지를 갖고 있어서 바람이 없어도 에너지가 사라지지 않고 전파되어 항만에 이르게 되고, 차폐된 항내수역에서 파고가 증폭되어 대형선박의 접이안과 하역작업을 중단시키는 경제적 손실을 야기한다. 본 실험은 대규모 개발에 따른 장주기 파랑에 의한 반응특성과 부진동의 영향을 검토하였다. 특히, 항만확장외에 외역에 추가적 개발을 위한 매립을 고려하여 항만정온도와 장주기 반응 특성을 파악하여 가능한 대책방향을 검토하고자 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.113-114
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• 2022

자율운항선박 원격제어시스템 구현을 위해 첨단장비와 안전한 시설을 갖추고, 특수목적선 코드를 적용해 감항성능 및 안전성이 매우 우수한 9,196톤의 아시아 최대 실습선인 한나라호를 실험선으로 활용하고 있다. 현재 한나라호와 육상간 원격제어를 위한 H/W 시스템이 설치되었으며, 지난 n항차 동안 통신네트워크 즉, VSAT, LTE, WIFI를 통해 원격제어에 필요한 데이터를 송수신하였다. 본 연구에서는 송수신된 데이터 분석을 통해 한나라호와 육상 간의 원격제어 및 통신네트워크의 문제점 식별하고, 이에 대한 대안방안 등을 제시하고자 한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2023.05a
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• pp.248-249
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• 2023

빠르게 변화하는 해양 교통 환경은 항상 선박과 관련 산업 종사자 등의 안전을 위협하고 있다. 특히나 선박의 안전하고 효율적인 접이안을 지원하는 약 300여 명의 도선사와 70여 척의 도선선은 안전 운항의 최전방에 배치되어 있으며 관련 사고가 발생할 시 타 사고에 비해 그 피해가 극심하다. 따라서 본 연구는 국내외의 과거 도선선 충돌 사고 사례를 분석하고 이를 안전 문화의 관점을 통해 바라보면서 미래의 안전 도선 환경 마련을 위한 대응책을 모색하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2003.05a
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• pp.132-138
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• 2003

In order to evaluate properly ship motion relating to the berthing maneuver, the hydrodynamic forces acting on ship hull in berthing maneuver need to be estimated rightly. CFD has been employed for time-domain simulation of transient flow induced by Wigley model moving laterally from rest in shallow water. The numerical solutions successfully captured not only the characteristics of the transitional hydrodynamic forces but also some interesting features of the flow field around a berthing ship according to the water depth. In this paper, the consideration is carried out on the approximate formula based on the CFD results, which can estimate hydrodynamic forces especially lateral drag coefficient starting from the rest to the uniform movement.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 1994.04a
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• pp.55-67
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• 1994

Studies on the ship's automatic navigation & berthing control have been continued by way of solving the ship's mathematical model but the results of such studies have not reached to our satisfactory level due to its non-linear characteristics ar low speed. In this paper the authors propose a new berthing control system which can evaluate as closely as captain's decision-making by using the FNN(Fuzzy Neural Network) controller which can simulate captain's decision-making by using the FNN(Fuzzy neural Network) controller which can simulate captain's knowledge. This berthing controller consists of the navigation subsystem FNN controller and the berthing subsystem FNN controller. The learning data are drawn from Ship Handling Simulator (NavSim NMS90 MK III) and represent the ship motion characteristics internally According to learning procedure both FNN controllers can tune membership functions and identify fuzzy control rules automatically The verified results show the FNN controllers effective to incorporate captain's knowledge and experience of berthing.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.4
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• pp.304-308
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• 2007

This paper deals with ANN(Artificial Neural Networks) and its application to automatic ship berthing. Due to the characteristic of ship's manoeuvre comparing with other moving objects on land, it has been known that the automatic control for ship's berthing cannot cope with various berthing situations such as various port shape and approaching directions. for these reasons. the study on automatic berthing using ANN usually have been carried out based on one port shape and predetermined approaching direction. In this paper, new algorithm with ANN controller was suggested to cope with these problems. Under newly suggested algorithm, the controller can select appropriate weights on the link of neural networks according to various situations. so the ship can maintain stable berthing operation even in different situations. Numerical simulations are carried out with this control system to find its improvement.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.41-43
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• 2012

유가의 상승에 따른 에너지확보는 매년 국가의 중요한 정책의 하나로 되었으며, 전세계적으로 다양한 탱카선이 건조되어왔고 이들 선박의 운항에 따라 국내에서도 탱가선을 서비스 하기위한 계류, 저장, 이송 시설 등 항만인프라의 구축이 원활하게 이루어지고 있다. 그러나, 이들 시설 중 돌핀부두에의 접이안을 위한 시설의 국내 설계기준은 오래전에 설정된 것으로 보완이 필요한 것으로 나타났다. 본 연구에서는 현재 건조되어 운항되고 있는 전세계의 탱카선의 자료를 수집하고 톤수에 따른 선형을 분석하여 돌핀부두내 작업돌핀, 접안돌핀, 계류돌핀의 적정간격과 계류안정성의 평가에 반영하고, 설계기준의 보완에 대한 의견을 제시하고자 하였다. 분석에는 전세계 250여척의 탱카선의 선형을 조사하였고, 미국, 영국, 캐나다 등 외국의 설계기준과 국내기준의 비교가 이루어졌다.

• Journal of Navigation and Port Research
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• v.45 no.1
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• pp.9-15
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• 2021

According to IMO, MASS is defined as a vessel operated at various levels independent of human interference. The safety navigation support service for MASS is designed to improve the safety and efficiency of MASS by developing public services on shore for ship arrivals/departures and for cargo handling. The safety navigation support service consists of a total of six types of services: autonomous operation, berthing/unberthing/mooring, cargo handling and ship arrival/departure service, PSC inspection, condition monitoring, and accident response support services. In order to support accident response service, the relative importance of a bridge navigational equipment was assessed by stratifying the navigation system to provide safe and efficient support services by objective judgment through specific and quantitative methods using AHP, one of decision-making methods used by an expert group. The survey was conducted by dividing the bridge navigational equipment into depth, location, and speed information. As a result of applying the AHP method, the importance of depth, location, and speed information was assessed. The relative importance of each equipment for providing location information was also assessed in order of Radar, DGPS, ECDIS, Gyro compass, Autopilot, and AIS. This was similar to survey results on the utilization of each operator's preference and its impact on marine accidents.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.255-257
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• 2014

The harbor tranquility is indicating the level of calmness in the mooring basin of harbor. It relates keenly to berthing/unberthing and cargo handling works but also it is an important indicator to get the minimum water area as the safe refuge. Therefore, it is necessary to analyze in complex the variation of wave height and direction caused by wave refraction, diffraction, shoaling and reflection from the incident waves from outside the harbor. In order to check the calmness inside a harbor, the numerical models are being used currently need fundamental reviews according to the difference of results which depend on their respective features. In this study, hence, it was introduced the validity of numerical models by comparing the computational results for Hupo harbor.