• 대한조선학회논문집
• /
• 제35권3호
• /
• pp.26-37
• /
• 1998

본 논문에서는 시험선 $\ulcorner$나래$\lrcorner$에 적용된 자세 제어 기술 및 그 실해역 시험 결과를 보이고자 한다. $\ulcorner$나래$\lrcorner$는 하부 몰수체와 그에 부착된 제어판을 이용하여 선체를 일정량 부상시키는 복합 지지선형을 채택하여 건조된 선박으로서, 본 연구원의 자체 설계를 거쳐 건조된 유인 시험선이다. 이러한 선형의 선박은 부상 상태에서 Heave, Pitch Roll의 3자유도에 대해 복원력이 거의 작용하지 않기 때문에 정적 불안정성을 가지며, 그에 따라 자세 제어 시스템이 필수적으로 요구된다. 시험선 $\ulcorner$나래$\lrcorner$에는 제어판 구동을 위한 유압 구동 장치 및 선체 운동의 계측을 위한 각종 계측 장비가 설치되었다. 제어기로는 PID 제어기가 사용되었으며, 실시간 제어를 위해 Pentium급 산업용 PC가 탑재되었다. 약 3개월 여에 걸쳐 부상 시험 및 조종 시험을 포함한 실해역 시험이 수행되었으며, 만족스런 제어 성능이 발휘됨을 확인하였다.

• 대한조선학회논문집
• /
• 제49권2호
• /
• pp.189-195
• /
• 2012

The ice trials of the first Korean icebreaking research vessel "ARAON" were performed at the Arctic Ocean in July-August 2010. The sea ice concentrations of Arctic Ocean were 4/10 to 10/10 and the range of sea ice thickness was roughly 1.0 to 3.5m. In this research, sea ice thickness characteristics at the old ice floes were determined from results of drill hole and apparent conductivity measurements. Especially we measured apparent conductivity using an electromagnetic induction instrument (EM31-MK2) and estimated the sea ice thickness through the empirical equation from Cold Regions Research & Engineering Laboratory, CRREL. The results of estimated sea ice thickness were compared to drill hole measurement results and then, we suggest the new empirical equation to estimate sea ice thickness of single layer type sea ice during the summer season of Arctic Ocean by curve fitting approach to these data.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2019년도 추계학술대회
• /
• pp.137-138
• /
• 2019

국제해사기구(IMO)가 지난 제101차 해사안전위원회(MSC)에서 자율운항선박에 대한 해상시운전에 관한 임시지침을 회람문서(MSC/Circ.1604)로 채택하였다. 이 지침은 향후 자율운항선박의 해상시운전에 가이드라인으로 사용될 것이며 정부당국과 이해관계자들이 MASS의 안전 확보, 환경보호 및 시스템의 운용을 위한 인프라 구축에 사용될 예정이다. 이에 본 연구에서는 IMO에서 채택한 MASS 임시운항 시운전지침을 분석하고 실제 이해관계자들의 정부책임과 의무를 명확히 구분하여 해상시운전에 필요한 리스크 관리의 주요사항을 인적요소 관점에서 제시하고자 하였다.

• 해양환경안전학회지
• /
• 제27권5호
• /
• pp.566-573
• /
• 2021

본 연구는 스마트 자율운항선박(Maritime Autonomous Surface Ship, MASS) 기술 개발 및 실증을 위한 산학 과제로서 목포해양대학교와 삼성중공업이 함께 참여한 연구가 안전하게 실시되어 질수 있도록 안전관리 절차서를 개발하였다. 본 연구에서는 국내 및 국제해사기구(International Maritime Organization, IMO)의 관련 가이드라인 및 해사 관련법 검토를 거쳐 안전관리 절차서를 개발하였다. 안전관리 절차서는 자율운항선박의 관련 해당 당국과 이해관계자들이 시스템 및 기반 시설에서 시험의 안전 및 환경 보호와 관련하여 적절하게 실시하기 위하여 국제해사기구에서 제시한 자율운항선박 시험을 위한 지침(MSC.1/Circ.1604, Annex : Interim guidelines for MASS trials)의 의거하여 개발 하였다. 개발된 안전관리 절차서는 당직체제로 운항 중인 선박에 항해보조기기로 탑재한 자율운항요소기술을 적용한 시스템의 해상 실증 시험을 위하여, 대한민국 연안의 해양환경보호와 항행 안전을 준수하면서, 관련 시스템의 시험이 안전하고 안정적으로 수행할 수 있도록 개발되었다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2004년도 추계학술대회논문집
• /
• pp.705-708
• /
• 2004

The vibration guideline of ISO 6954, which has been applied for evaluation of vibration status in accommodation area of ships had been revised. In this paper, the application results of ISO 6954:1984 and ISO 6954:2000(E) are compared based on the measured results on sea trials.

• 한국응용과학기술학회지
• /
• 제36권1호
• /
• pp.113-124
• /
• 2019

The purpose of the study was to investigate the effects of sea cucumber extract on skin as a natural cosmetics functional material. Subjective evaluation of cosmetics before and after were conducted with questionnaires regarding moisture content, sebum content, melanin index, and erythema index. Experiments were conducted on improvement efficacy using skin clinical trials and questionnaires to evaluate changes in perception of skin condition and efficiency of products. With the aim of minimizing skin irritation, the efficiency of the solvent used for extraction was an important factor, and the sea cucumber extract was harvested with efficient extraction conditions at a ratio of 1:10 of 50% ethanol. The study aimed to identify the suitability of sea cucumber extract as a functional cosmetics material to improve the moisturizing ability of skin and its effect on the skin by adding marine natural animal sea cucumber extract. Clinical studies on cosmetics skin containing sea cucumber extract, excellent skin improvement effect from all items of clinical experiment in experimental and control groups. Sea cucumber extract was proved to be a stable, non-adverse physiologically active substance against abnormal symptoms or side effects of skin reactions and skin problems. In addition, the study found excellent results that can lead to its use as a cosmetics material. This is expected to contribute to the development of various cosmetics industries.

• Journal of Ship and Ocean Technology
• /
• 제5권4호
• /
• pp.44-50
• /
• 2001

Large container carriers are suffering from lack of knowledge on reliable correlation allowances between model tests and full-scale trials, especially at fully loaded condition, Careful full-scale sea trial with a full loading of containers both in holds and on decks was carried out to clarify it. Model test results were analyzed by different methods but with the same measuring data to figure out appropriated correlations factors for each analysis methods, Even if it is no doubt that model test technique is one of the most reliable tool to predict full scale powering performance, its assumptions and simplifications which have been applied on the course of data manipulation and analysis need a feedback from sea trial data for a fine tuning, so called correlation factor. It can be stated that the best correlation allowances at fully loaded condition for both 2-dimensional and 3-dimensional analysis methods are fecund through the careful sea trial results and relevant study on the large size container carriers.

• 수산해양기술연구
• /
• 제44권3호
• /
• pp.165-173
• /
• 2008

Sea experiment for this study was carried out to develop a Trawl Escapement Net(TEN) using net material to improve the survival rate of undersized fishes that escaped from trawls in the Korean southern sea in May and November, 2005. Three kinds of Trawl Escapement Net(TEN) were examined to increase the escapement rate for fishes escaped from the TEN, and total catches in the codend and cover-net were investigated. The main catch species in the experimental fishing trials using a V shape TEN(A type) in May were Korean pomfret(Pampus echinogaster), slimy(Leiognathus nuchalis), gizzard shad(Konosirus punctatus), white croaker(Pennahia argentata) and smelt(Sillago sihama). In the experimental fishing trials using a V shape TEN with a protector for undersized fishes(B type) and a panel shape TEN with a protector(C type) in November, the main catch species were horse mackerel(Trachurus japonicus), sea pike (Sphyraena japonica), large-head hairtail(Trichiurus lepturus), kammal thryssa(Thryssa kammalensis), white croaker(Pennahia argentata), butterfish(Psenopsis anomala) and red gurnard(Lepidotrigla microptera). Most of large-sized fish species like Korean pomfret and Spanish mackerel could not escape through the TEN in the B type and C type. Catches of horse mackerel were highest in the experimental fishing of November and escapement rates for most fish species including horse mackerel were higher in the C type compared with B type.

• 대한조선학회논문집
• /
• 제36권1호
• /
• pp.53-60
• /
• 1999

해상 시운전을 수행하기 전에 그 예비단계로서 주기관 등을 점검하는 도크내 시운전을 행하게 되는데, 이때 선박은 계선용 밧줄에 의해 그 움직임이 제한된다. 따라서 계선 상태에 대한 해석이 필요한데 이를 위한 입력자료로서 계선시 프로펠러에 의한 추력 값이 주어져야 한다. 현대중공업에서는 간단한 수식을 이용하여 이를 추정하고 있으나 최근 선박의 대형화 및 고속화와 더불어 기존 수식에 대한 타당성 검토가 요구되고 있으며 또한, 예상되는 대형 사고의 위험을 미리 방지하기 위하여 보다 정확한 계선상태 해석이 요구되고 있다. 본 연구에서는 계선시 프로펠러 추력의 예측에 관한 수식을 검토하고 게선 해석을 위한 신빙성 있는 자료를 도출하고자 실적선을 대상으로 모형시험을 수행하였다.

• 대한조선학회논문집
• /
• 제48권5호
• /
• pp.421-425
• /
• 2011

To know the speed performance of "ARAON" in Arctic ice field, the measurement of ice properties which is ice thickness & strength, snow depth and free board were performed on July 2010. The measuring method of nautical signals such as heading angle, power of engine, wind & current information etc. was described in this paper. The speed sea trials in ice were performed on the four different positions with different ice properties and engine powers because the uniform level ice is not detected in the Chukchi Sea. The test field was partially constrained ice floe with hummocks and it was superposed with small broken ice pieces each other. All of the measured ice properties were compared and evaluated according to the results of sea trial. The relations between speed, ice thickness, strength and power were summarized. Consequently according to the sea trial results, the speed of ARAON is 2.78knots at the 2.49m ice thickness with 6.55MW engine power.