• 한국해양공학회지
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• 제25권5호
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• pp.27-32
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• 2011

Recently, a ship-shaped barge has been developed to improve the resistance performance, as well as course-keeping capability. However, the stern of the barge is still similar to a box shape, and the vortex generated at the side of the barge creates drag and yaw instability. In order to solve this problem, stern skegs are normally used. The present paper deals with the correlation between the size of the stern skegs and the barge dimensions and hull coefficient. A stern skeg was designed to prevent yaw instability and minimize any additional resistance. The resistance test and course keeping test were performed in the towing tank at Pusan National University. To determine the correlation parameters between the designed stern skeg size and barge dimensions, a parametric study was also performed. Based on the experimental data from five barges, the optimum skeg dimensions were successfully derived. It is expected that the validation of the present study will be carried out by further experiments and computational comparisons in the near future.

• 한국항해항만학회지
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• 제29권7호
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• pp.595-601
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• 2005

The IMO manoeuvrability standard was established for preventing sea accidents such as collisions and strandings due to the lack of manoeuvrability. The standard of ship manoeuvrability enforced by resolution MSC.l37(76) has been applied to vessels of 100m or more in length and all chemical tankers and gas carriers regardless of the length, which were constructed on or after 1 July 1994. The IMO manoeuvrability standard is able to be divided into three kinds as followings; (1) Turning capability standard: Estimated values in design stage are to be certified by turning circle test of the actual vessel. (2) Course keeping quality standard : Estimated values in design stage are to be certified by 10 deg. and 20 deg. zig-zag tests of the actual vessel. (3) Shortest stopping distance standard : Estimated value in design stage is to be certified by the shortest stopping distance tested by the actual vessel. In this paper, the authors verified the criteria of IMO manoeuvrability standard comparing them with the values resulted from sea trial tests of various kinds of actual vessels and examined separately the validity of all criteria of the standard.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2005년도 추계학술대회지
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• pp.27-33
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• 2005

The IMO manoeuvrability standard was established for preventing sea accidents such as collisions and strandings due to the lack of manoeuvrability. The standard of ship manoeuvrability enforced by resolution MSC.137(76) has been applied to vessels of 100m or more in length and all chemical tankers and gas carriers regardless of the length, which were constructed on or after 1 July 1994. The IMO manoeuvrability standard is able to be divided into three kinds as followings; (1) Turning capability standard: Estimated values in design stage are to be certified by turning cir치e test q the actual vessel (2) Course keeping quality standard: Estimated values in design stage are to be certified by 10 deg. and 20 deg. zig-zag tests of the actual vessel. (3) Shortest stopping distance standard: Estimated value in design stage is to be certified by the shortest stopping distance tested by the actual vessel. In this paper, the authors verified the criteria of IMO manoeuvrability standard comparing them with the values resulted from sea trial tests of various kinds q actual vessels and examined separately the validity of all criteria of the standard.

• International Journal of Naval Architecture and Ocean Engineering
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• 제4권4호
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• pp.488-503
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• 2012

The stern boat deployment system was investigated to evaluate the capability of launching and recovering rigid hull inflatable boat (RHIB) via the stern ramp. The main parameters to launch and recover RHIB were tested at the design stage. The combined hydrodynamic effect of the stern wake and the water jet flow made it difficult to maintain the maneuvering and sea-keeping ability of RHIB approaching to the stern ramp. The safe recovery course was proposed to maintain the directional control of RHIB and to reduce the combined hydrodynamic effect in the transom zone. To evaluate the feasibility of RHIB recovery, the stern sill depth was measured in various conditions and the ramp availability time was obtained. Also, the experimental percent time operability (PTO) test was performed by the number of successive launching and recovering operations.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 춘계학술대회 논문집
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• pp.71-76
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• 2005

대형선박의 충돌 혹은 좌초와 같은 많은 해양사고는 선박의 조종성능 부족으로 인하여 발생되고 있다. 따라서 IMO(국제해사기구)에서는 1994년 제18회 총회에서 결의서 A.751(18)로서 선박조종성에 대한 잠정기준을 채택하였고, 이 기준은 1994년 7월 1일 이후 건조된 길이 100m 이상의 선박 또는 길이에 관계없이 모든 케미컬탱커 및 개스운반선에 대하여 적용된다. IMO 조종성기준은 크게 설계단계에서의 선회성능과 보침성능 및 최단정지성능으로 대별된다. 이 논문에서는 몇 척의 대형선박에 대한 최초 설계단계에서의 자료를 이용하여 조종성능에 관한 계산 및 시뮬레이션을 행하고, 계산된 결과를 모형실험 결과와 비교, 검토하였으며, IMO 조종성 기준의 타당성에 관하여 검토 고찰하였다.

• 한국항해항만학회지
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• 제29권5호
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• pp.365-370
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• 2005

대형선박의 충돌 혹은 좌초와 같은 많은 해양사고는 선박의 조종성능 부족으로 인하여 발생되고 있다. 따라서 IMO(국제해사기구)에서는 1994년 제18회 총회에서 결의서 A.751(18)로서 선박조종성에 대한 잠정기준을 채택하였고, 이 기준은 1994년 7월 1일 이후 건조된 길이100m 이상의 선박 또는 길이에 관계없이 모든 케미컬탱커 및 개스운반선에 대하여 적용된다. IMO 조종성기준은 크게 설계단계에서의 선회성능과 보침성능 및 최단정지성능으로 대별된다. 이 논문에서는 몇 척의 대형선박에 대한 최초 설계단계에서의 자료를 이용하여 조종성능에 관한 계산 및 시뮬레이션을 행하고, 계산된 결과를 모형실험 결과와 비교, 검토하였으며, IMO 조종성기준의 타당성에 관하여 검토 고찰하였다.

• Strategy21
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• 통권44호
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• pp.352-376
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• 2018

Through this research, the current state of naval coordination and guidance of shipping is reviewed whereupon which a suggestion is made for a novel role which satisfies the needs of the people and the country asked of the Navy. Taking into consideration the dynamic security environment, the developing relationship between the two nations on the Korean peninsula, and the influence that the Republic of Korea has on maritime security, it is made more urgent that the Navy takes a proactive course of action in terms of naval coordination and guidance of shipping. The current form of Korean naval coordination and guidance of shipping is adapted from the logical and flexible concepts of NCAPS and NCAGS and is one of many tasks that the Republic of Korea Navy must perform. However, when the Republic of Korea Navy develops blue-water capabilities with the ambitions of protecting its people and their way of life, naval coordination and guidance of shipping could potentially become one of the primary functions of the Republic of Korea Navy that the it must champion. Already, there are indications that foreign navies are, through many developments and commitment towards naval coordination and guidance of shipping, protecting its people and states' interests wherever is necessary. In the case of Chile, its Navy has taken the helm of naval coordination and guidance of shipping and has integrated various maritime organizations including the coast guard and the National Customs Service for the sake of maintaining regional maritime security, showing immediate force if necessary. Presently, as the Republic of Korea Navy looks to be a global naval power, it is important that a reprioritization of the Navy's mission is undertaken, all the while sustaining military readiness posture on the Northern Limit Line. It cannot be any more emphasized how crucial thorough military readiness posture is as a natural stance against the enemy. That being said, contributing towards international maritime security is consistent with the nation's standing. It is a fact that maritime security has been conceptualized and developed merely as a study within the Ministry of Maritime Affairs and Fisheries, the Republic of Korea Navy, and other governmental organizations, forces, and academia. Naval cooperation and guidance of shipping suggested by this research as a practical operational field is a concrete solution to what once was an abstract concept. To stand firm on its status as a maritime nation, the Republic of Korea must establish a Maritime Security Organization within its Navy and develop the appropriate doctrines. Attaining experts, developing doctrines, and cultivating the capability to deploy maritime forces will allow for the Republic of Korea to execute a primary role in keeping international maritime security and naval coordination and guidance of shipping. To fully achieve its latent potential necessitates the Republic of Korea Navy to expedite the introduction of naval coordination and guidance of shipping concepts and to establish the appropriate doctrines, operation plans, and organizations.

• 지능정보연구
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• 제20권2호
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• pp.179-192
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• 2014

최근 IT 환경의 변화에 따라 웹 서비스를 기반으로 대규모 사용자 대상의 상호 참여적인 MOOC(Massive Open Online Courses)과 같은 온라인 교육 환경이 부상하고 있다. 그러나 온라인 교육 시스템은 원거리로 학습이 이루어짐에 따라 학습자의 자발적 동기를 꾸준히 유지하기 어려우며, 또한 학습자 간에 지식을 공유하고 공유한 지식을 활용하는 기능이 부족하다. 이러한 문제를 극복하기 위해 구성주의적 학습이론과 집단지성에 기반하여 학습자가 보유한 학습자료를 공유하고 개인화된 학습자료 추천을 받을 수 있는 학습자료 북마킹 서비스인 WeStudy를 구현하였다. 위키피디아(Wikipedia), 슬라이드쉐어 (SlideShare), 비디오렉쳐스 (VideoLectures) 등 현존하는 집단지성 기반 서비스들의 주요 기능으로부터 필요한 집단지성 기능들을 검토하였으며, 본 서비스의 주요 기능으로 1) 리스트 및 그래프 형태의 학습자료 리스트 시각화, 2) 개인화된 학습자료 추천, 3) 보다 상세한 학습자료 추천을 위한 관심 학습자 지정 등을 도출하여 시스템을 설계하였다. 이후, 웹 기반으로 구현된 세 가지 주요기능 별로 개량된 휴리스틱 사용성 평가 방법을 통해 개발된 시스템의 사용성 평가를 실시하였다. 10명의 HCI 분야 전공자 및 현업 종사자를 대상으로 정량적 및 정성적인 평가 결과, 세 가지의 주요 기능에서 전반적으로 사용성이 우수한 것으로 판정되었다. 주요 기능 별 정성적인 평가에서 도출된 여러 마이너 이슈들을 반영할 필요가 있으며, 향후 대규모 사용자를 대상으로 본 서비스를 보급하고 이용할 수 있도록 제공하여 자발적인 지식 공유 환경을 조성할 수 있을 것으로 전망된다.