• 해양환경안전학회지
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• 제14권2호
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• pp.157-162
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• 2008

선박의 충돌회피조선에 있어서 조종성능은 중요한 요소이다. 일반적으로 사용되는 조종성능은 심수역을 대상으로 작성되며, 천수역을 항주하는 선박의 조종성은 일반적으로 선회성은 저하되고 침로안정성 또는 추종성은 향상된다. 이러한 선회성의 변화는 충돌회피에 있어 위험을 초래할 수 있다. 본 연구에서는 천수역의 조종성능을 반영함과 동시에 충돌위험정도를 쉽게 파악할 수 있도록 하기 위한 가변안전경계영역의 새로운 적용기법을 제시하였다. 수학적 수치시뮬레이션 검증을 통하여 새롭게 제안된 기법의 유용성을 확인하였다. 따라서 선박충돌위험에 대한 충분한 충돌회피 조선을 지원할 수 있을 것으로 기대된다.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권3호
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• pp.454-467
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• 2013

A practical Ship Inner Shell Optimization Method (SISOM), the purpose of which is to improve the safety of the seagoing transport ship by decreasing the maximum Still Water Bending Moment (SWBM) of the hull girder under all typical loading conditions, is presented in this paper. The objective of SISOM is to make the maximum SWBM minimum, and the section areas of the inner shell are taken as optimization variables. The main requirements of the ship performances, such as cargo hold capacity, propeller and rudder immersion, bridge visibility, damage stability and prevention of pollution etc., are taken as constraints. The penalty function method is used in SISOM to change the above nonlinear constraint problem into an unconstrained one, which is then solved by applying the steepest descent method. After optimization, the optimal section area distribution of the inner shell is obtained, and the shape of inner shell is adjusted according to the optimal section area. SISOM is applied to a product oil tanker and a bulk carrier, and the maximum SWBM of the two ships is significantly decreased by changing the shape of inner shell plate slightly. The two examples prove that SISOM is highly efficient and valuable to engineering practice.

• 대한조선학회논문집
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• 제45권3호
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• pp.329-336
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• 2008

Basic performances of wireless sensor network (WSN) and power line communication (PLC) confirmed in the test bed ashore are investigated in the 3000-ton class training ship of Korea Maritime University. The ubiquitous technologies can be considered for the provision of safety and convenience in a ship. We employed WSN and PLC, as the ubiquitous technologies, at the two areas within the training ship to estimate the realization of the ubiquitous environments in a ship. The experiments show rather good results in terms of data transfer rate. However, more detailed studies concerning the connection between WSN and PLC, noises induced to power line and fading effects are required to improve the quality and the stability of the communication for the ubiquitous environments.

• 로봇학회논문지
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• 제17권1호
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• pp.48-57
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• 2022

In this paper, we propose a legged landing platform for the quadcopter taking off and landing in the ship environment. In the ship environment with waves and winds, the aircraft has risks being overturned by contact impact and excessive inclination during landing on the ship. This landing platform has four landing legs under the quadcopter for balancing and shock relief. In order to make the quadcopter balanced on ships, the position of each end effector was controlled by PID control. And shocks have mainly happened when quadcopter contacts the ship's surface as well as legs move fast. Hence, impedance control was used to cope with the shocks. The performance of the landing platform was demonstrated by a simulation and a prototype in three sea states based on a specific size of a ship. During landing and tracking the slope of the ship's surface, oscillations of rotation and translation from the shock were mitigated by the controller. As a result, it was verified that transient response and stability got better by adding impedance control in simulation models and prototype experiments.

• 수산해양교육연구
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• 제24권1호
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• pp.1-8
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• 2012

In recent 5 years, the 70 percent of the ship's accident was occurred in the fishing vessels, and most of them were the engine troubles and collisions. The capsizing accident was comparatively low portion of occupation, which took only 2 percent, but the scale of accident and the loss of lives and property are known very tremendous. In this paper, it was examined for the stability provisions of fishing vessels in domestic and international to reduce the capsizing of them. Also, it was made an analysis for the case of capsizing accidents to suggest the measures against the capsizing.

• 한국산업융합학회 논문집
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• 제23권4_2호
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• pp.661-667
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• 2020

The optimal shape modeling of core parts through 3D modeling and structural analysis for the development of small and medium-sized ships. The goal is to improve the efficient structure of the hydraulic system for controlling the rudder among the core steering parts in small and medium-sized ships. Through 3D modeling and structural analysis, a new concept of tiller parts and a double-acting hydraulic cylinder control system were proposed and operational structural stability was evaluated. Structural analysis of the three different tiller designs that can be replaceable onto existing fishing vessels was conducted to derive the final shapes. The emphasis was placed on evaluating the structural stability of the key drive components, the tiller, pin, and cylinder rodin the maximum torque condition of the hydraulic cylinder.

• 한국기계연구소 소보
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• 통권17호
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• pp.145-156
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• 1987

A PSWATH is a computer program for the determination of principal particulars of Small Waterplane Area Twin Hull (SWATH) Ship design at the preliminary design stage. This paper describes the PSWATH system and the underlying theory. The major calculation modules are hull definition, resistance and propulsion, weight estimation and pitch stability analysis. Use of the model is illustrated by input, output and means of examples.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2021년도 추계학술대회
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• pp.203-203
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• 2021

• 한국항해항만학회지
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• 제26권2호
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• pp.189-192
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• 2002

우리나라 대부분의 어선은 침수 및 전복에 의해 야기되는 해양사고에 있어 그 빈도가 높으며, 특히 24m이하의 소형어선에서 두드러진다. 그럼에도 불구하고 소형어선에 대한 복원성 기준이 없을 뿐 아니라 소형어선의 복원성 자료를 찾기란 그리 쉽지 않다. 이에 본 연구에서는 90년 이후 표준어선으로 고시되어 건조 실적이 있는 실적선 10척에 대해 계측된 자료를 활용하여 이를 기초로 Genetic Programming을 이용한 GM 추정식을 도출하였다. 또한 국외 복원성 기준과 GP 추정식을 이용 각각에 대해서 GM을 평가하여, Genetic Programming에 의한 GM추정의 타당성을 보였다. 하지만, 이러한 결과값이 사용되기 위해서는 보다 많은 실적선 Data를 이용한 추론이 요구된다.

• 해양환경안전학회지
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• 제24권5호
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• pp.497-503
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• 2018

여객선과 실습선은 많은 인원이 승선한다는 점에서 서로 공통적인 특성을 갖고 있다. 이러한 이유로 여객선형 선박의 안전한 운항이 대단히 중요하다. 정상적인 항해 중, 선박은 다양한 형태의 타각을 사용하여 변침하고, 위험 물표와의 충돌 회피를 위해 선회하기도 한다. 선박이 선회하면 횡경사가 발생하고, 운항 당시 여건이 불리할 경우 위험횡경사가 발생하거나 전복사고로 이어질 수 있다. 본 연구에서는 여객선과 유사한 두 척의 실습선을 대상으로 실선 선회 실험을 통해 횡경사를 계측하였고, 이를 선회 중 횡경사 이론식과 비교분석하였다. 그 결과, IMO 복원성 성능기준에 제시된 선회 중 횡경사 계산식을 이용한 최대횡경사 예측의 한계점을 확인하였다. 또한, 선회 중 횡경사 이론식에 전타 당시 선속을 반영하고, 계산된 결과값에 우 선회시 1.4배, 좌 선회시 1.1배를 적용하면 최대횡경사 예측이 가능함을 확인하였다. 본 연구는 선회 중 위험횡경사 예방에 관한 안전운항기준을 마련하는데 기초 자료로 활용될 것으로 기대된다.