• Journal of the Korean Society of Marine Environment & Safety
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• v.3 no.1
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• pp.85-92
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• 1997

To understand the dynamics of a drifting object, an analysis based on fluid dynamics theory is presented. A simplified analysis shows a consistency with the linear formula currently used for search and rescue mission. Also an experiment using miniatured human models has been conducted to study the drift characteristics of Person-in-Water. The tests were carried out at the water channel facility and the models were tested in different positions and styles. The measured drag coefficients for human body ranged over 0.4-1.2.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.335-337
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• 2015

항로표지 유실사고(등부표)가 발생 후 항로표지가 관할구역을 벗어나 타지방청 관할구역으로 표류할 경우에 대해, 실제 사례를 들어 대응 시스템의 문제점을 분석하고 효율적인 대응방안을 제시하였다.

• 어항어장
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• s.89
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• pp.41-47
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• 2010

전국어업지역에 큰 영향을 미칠 가능성이 있는 리스크로서 지진 해일 재해 리스크의 감재대책에 대한 기본적인 사고에 의거, 위기관리의 관점에서 서술하고자 한다. 전국의 어항 어업 취락에서 지진 해일 재해의 리스크를 증대시키는 요인으로서 협소한 토지에 어항시설이나 가옥의 밀집, 고령화의 진행에 의해 재해시 피보호자가 되기 쉬움, 낚시객 해수욕객 등 지리에 어두운 외래자의 방문 증가, 어선이나 어업 양식시설의 표류 우려 등 어업 지역 특유의 여러가지 리스크 인자를 가지고 있다.

• Proceedings of KOSOMES biannual meeting
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• 2001.05a
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• pp.137-146
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• 2001

To improve SAR capabilities in Korea, marine casualties during 5 years(1995-1999) were analyzed and drifting experiment of G/T 50 ton class vessel was carried out off Pusan harbor. As a result, it was found that the occurrence of casualty by fishing boat ranked highest and a considerable numbers of casualties took place more than 20 miles off the shore, and leeway was computed by two drifting experiments as 0.045U - 010 $^{\circ}$, 0.037U＋ 021 $^{\circ}$ respectively.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2022.06a
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• pp.66-67
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• 2022

등부표는 항로표지 중 유일하게 해상에 설치되는 항로표지이다. 등부표의 중심은 침추이지만, 항해자에게 시각적으로 확인되는 등부표의 실제위치는 외력에 의해 지속적으로 표류한다. 이러한 등부표의 위치를 확인하기 위하여 지난 5년간(2017-2021년) 전국 255기의 등부표 위치를 분석하였다. 분석결과 Data 오류는 17.94%였으며, 위치는 집중형, 이격형 등으로 구분되었다.

• Journal of Navigation and Port Research
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• v.30 no.10 s.116
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• pp.787-791
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• 2006

It has not been well known to the publics about the manning structure and navigation skills of the period of Chosun CHOI Bu left several records on the crews and navigation skills in his book PYOHAE-Rok. Though PYOHAE-Rok the record of Drifting across the Sea, written by CHOI Bu in 15th century, has been studied by many scholars from the Korean Sea Literary viewpoints, no one was interested in the above book from a maritime history standpoint until now. In this paper the author tried to find out the manning structure of ship and navigation skills in the period of Chosun Finally the author would like to explain the reasons CHOI's ship could succeeded in reaching mainland CHINA but CHANG Han-cheol's ship was wrecked.

• Journal of Navigation and Port Research
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• v.31 no.3 s.119
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• pp.223-228
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• 2007

In recent trends of the enlargement and specialization, container ship, LNCG, PCC and passenger ship which have relatively large hull and superstructure above the water line, are already being operated in the world It is very important information for the safety operation of these vessels to estimate the ship's performance under the specific wind condition while berthing, unberthing or low-speed sailing. In this paper, the effect of wind force and moment acting on the training ship HANNARA is investigated by using the numerical calculations. The results of drift angle and counter rudder angle with the relative wind direction and force, the critical wind velocity with the ratio of wind velocity and ship's speed and maximum heeling angle with the wind velocity are shown The presented results can be applied directly to T/S HANNARA in berthing maneuver and avoiding typhoons, and utilized as an educational materials.

• Journal of the Society of Naval Architects of Korea
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• v.43 no.5 s.149
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• pp.529-537
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• 2006

International Maritime Organization (IMO) is planning to include the Alternative Assessment of the Weather Criterion in the new Intact Stability (IS) Code to be revised. In this study, the procedure of the model test in the Interim Guidelines was reviewed by carrying out the model test and analyzing the test results. For this purpose, RO/RO passenger ship whose ratios of breadth to draft and the height of weight to draft were above 3.5 and above 0.6 respectively was selected as a test ship. Drifting test and motion test in regular waves were performed to estimate the hydrodynamic heeling lever and roll-back angle. Motion tests in waves were carried out in the three wave steepness conditions to measure roll-back angle and examine the feasibility of so called, the Three-step method. Using the test data, satisfaction of the Weather Criterion was assessed for the test ship by using the alternative method and compared with the current method.

• Journal of Biomedical Engineering Research
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• v.24 no.2
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• pp.83-89
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• 2003

The gas electron multiplier placed in the drift volume of conventional gas detectors, is a conceptually simple device for producing a large gas gain by concentrating the drift electric field over a very short distance to the point that electron avalanching occurs(〉 10$^4$ V/cm), greatly increasing the number of drifting electrons. This device consists of a thin insulating foil of several tens of urn in thickness. covered on each side with a thin metal layer(Cu), with tiny holes, usually 100 ${\mu}{\textrm}{m}$ or less in diameter. and with a spacing of 100-200 ${\mu}{\textrm}{m}$ through the entire foil. perforated by using chemical etching or high-powered laser beam technique In this study, we have investigated its operating properties with various experimental conditions, and demonstrated the possibility of using this device as a digital X-ray imaging sensor, by acquiring X-ray images based on the scintillation properties of the gas electron multiplier with standard CCD camera.

• Journal of Astronomy and Space Sciences
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• v.15 no.2
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• pp.427-436
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• 1998

The apogee manoeuvre of $KOREASAT-1{cdot}2{cdot}3$ is basic elliptical orbit transfer converting orbit plane. The KOREASAT-3 is planed for multi-burn manoeuvres using the liquid apogee engine while the $KOREASAT-1{cdot}2$ used the apogee kick motor that executes a single burn in the apogee of transfer orbit using the solid propellant. This study analyzed the multi-burn manoeuvres using the liquid apogee engine and the propellant control method and developed the simulation tools. For the purpose of precise simulation, We designed tools in the basic of orbit propagation software, COWELL5, that was developed by members of Center for Astrodynamics in Yonsei university and the results can be displayed in 3-D graphic of $STK/VO^{TM}$.