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Azimuth thruster 시스템을 장착한 나라호의 조종성
김정창,강일권,이준호,함상준,박치완,김수형,KIM, Jung-Chang,KANG, Il-Kwon,LEE, Jun-Ho,HAM, Sang-Jun,PARK, Chi-Wan,KIM, Su-Hyeng 한국수산해양기술학회 2017 수산해양기술연구 Vol.53 No.3
The research vessel NARA equipped with an azimuth thruster system was built in 2015. There are few vessels with this propulsion system in Korea. This vessel has two modes such as the normal for maneuvering and the power for investigation, and the other two modes as one axis and two axes on the operating. This type of vessels does not seem to have a clear grasp of the maneuvering character in comparison with the vessel with a conventional propulsion system. So the authors carried out the sea test for the turning, the zigzag and the inclination, and the results are as follows. In turning test, the case of using the two axes mode is much better than the case of using the one axis mode for the elements of turning, such as advance, transfer, tactical diameter and final diameter, but turning hard over the rudder in full speed is very vulnerable to capsize in both modes. In zigzag test, the yaw quicking responsibility index, T is very large excessively, which means a bad counter maneuvering ability, so an operator has to keep in mind that in turning operation. If necessary to avoid collision at head on situation, it may be a more effective method to use the crash astern stop than the turning according to the conditions and circumstances for the shortest stopping distance is very short.
김정창 ( Jung Chang Kim ),강일권 ( Il Kwon Kang ),함상준 ( Sang Jun Ham ),박치완 ( Chi Wan Park ) 한국어업기술학회 2015 수산해양기술연구 Vol.51 No.4
A historical tragic disaster happened by capsizing the passenger ship Sewol at South Western Sea of Korea in 16, April 2014. The ship which left Incheon harbour to bound for Jeju port passed Maengol strait and reached to approach of Byung Pung island, and then capsized and sank with a sudden inclination to the portside in the mean time of starboard the helm. In this time, the ship which has very poor stability without sufficient ballast waters and with over loading cargo listed port side caused by the centrifugal force acting to the outside of turning. A lot of cargoes not fastened moved to the port side consequently, and the ship came to beam end to capsize and sank in the end. No crews including especially captain would offer their own duties in a such extremely urgent time, as a result, enormous number of victims broke out including a lot of student. In this report, author carried out some calculation on the factors which influenced on the stability of the ship, i.e. the ship``s speed, the rudder angle, the weight of cargoes and distance of movement, the surface effect of liquid in the tank. We found out that the most causes of capsize were the poor stability with heavy cargoes and insufficient amount of ballast water against the rule, and the cargoes unfastened moved one side to add the inclination as well. Above all, the owner be blamable because of the illegally operating the ship without keeping the rule.
HF 데이터 통신에서 디지털 모뎀을 위한 RS 및 컨볼루션 부호의 연접 부호 성능
김정창 ( Jeong Chang Kim ),양규식 ( Gyu Sik Yang ),정기룡 ( Gi Ryong Jeong ),박동국 ( Dong Kook Park ),정성훈 ( Sung Hun Jung ) 한국항행학회 2012 韓國航行學會論文誌 Vol.16 No.2
본 논문에서는 HF (high frequency) 데이터 통신을 위한 디지털 모뎀의 성능 향상을 위하여 개선된 오류정정부호 방식을 제안하고 성능을 검증한다. 제안하는 오류정정부호 방식은 외부의 Reed-Solomon 부호와 내부의 컨볼루션 부호를 연접하여 만들어진다. 시뮬레이션 결과는 제안하는 시스템이 기존 PACTOR-Ⅲ 규격의 오류정정부호 방식을 사용하는 시스템에 비해 비트 오율 성능을 크게 향상시킴을 보여준다. 따라서 제안하는 부호화 방식을 사용하여 HF 데이터 통신을 위한 디지털 모뎀의 대역폭 효율성을 크게 향상시킬 수 있을 것이다. In this paper, we propose an improved error correction code in order to improve the performance of digital modems for HF data communications and verify the performance of the proposed scheme. The proposed scheme employs outer Reed-Solomon codes concatenated with inner convolutional codes. Numerical results show that the proposed system significantly improves the bit error rate performance compared to the conventional PACTOR-Ⅲ modems. Hence, the proposed system can improve the bandwidth efficiency of digital modems for HF data communications.
항공 우주 해상 분야 : e-Navigation 대응 해상 데이터통신 시스템 개선
정성훈 ( Sung Hun Jung ),양규식 ( Gyu Sik Yang ),정기룡 ( Gi Ryong Jeong ),박동국 ( Dong Kook Rark ),김정창 ( Jeong Chang Kim ) 한국항행학회 2011 韓國航行學會論文誌 Vol.15 No.6
GMDSS 적용 선박들에 의무적으로 탑재되는 통신장비들의 기능적 한계를 개선하기 위하여 통신 매체별 통신비용, 처리율, 통신 속도, 처리 가능한 서비스, 통신 가능 범위 등에 대한 성능 분석 및 평가를 통하여 e-Navigation 수행에 적합한 데이터통신 시스템의 설계와 구현을 하였다. 제안한 시스템의 실험 결과를 통해, 해상에서 사용할 수 있는 MF/HF 대역은 3600bps 정도의 단문 메시지 송·수신이 유용하고, VHF 대역에서는 9600bps 정도의 이메일 정도의 서비스가 가능하며, 해사위성통신의 Fleet Broadband 서비스의 경우는 수Mbps의 멀티미디어 서비스가 가능함을 확인하였다. We show a new scheme and implementation of maritime data communication systems for GMDSS ship which performs e-Navigation and removes the functional limitation of those systems through comparing to service fee, call processing reliability, and bit rates of all of those systems within communication range at sea. We confirmed available each frequency band communication and application services at sea by experimental result with proposed new system, MF/HF band being useful to a short text message service, VHF band to 9600bps email service, Fleet Broadband Maritime Satellite system to one or more Mbps multimedia service each.
강일권 ( Il Kwon Kang ),김형석 ( Hyung Seok Kim ),조효제 ( Hyo Jae Jo ),김정창 ( Jung Chang Kim ),함상준 ( Sang Jun Ham ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.3
The inherent efficiency of a ship would be prior to any other quality factors in ship´s safety, because lack of it may give rise to a serious sea casuality even if it were a light mistake in operation. And the representative casualty comes from a deficiency of stability and an operating error combined would be capsizing. The Korean offshore large purseiner looks to have a structural weak point with small range of stability in spite of her big initial metacentric height, and have various type of roll reduction devices in order to cover up the defect. The aim of this study is to grasp for the roll reduction characteristics of the purseiner with bilge keel only and a stern keel additionally attached. The results are summarized as follows; The rolling angle of the model ship was increased in accordance with increase of the wave period and height, especially at close to the natural wave period of her, and the trends were more distinguished in the situation of bilge keel only installation than in the stern keel additionally installed. And stern keel has not noticeable effect on the reduction of the roll in the light ship condition, but has a little effect in full load condition.