• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.6
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• pp.1243-1251
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• 2017

When a Ship sails in the ocean, it is significant to find one's position for safe navigation. Most of ships have been using GPS navigation since its development after 1990's. The celestial navigation was used as the navigation method when sailing in the ocean, but time-consuming process such as complicated calculation and plotting the result on chart diminished its utilization. The thesis explains convenience and utilization of existing celestial navigation by resolving challenges it has. As a way of enhancing the celestial navigation, the author developed a software which incudes a numerical formula based on the previous calculation process. When a navigator inputs the altitude of sun, GHA and dec into computer while sailing, the position of the ship will be displayed as the coordinates. The improved method thus reaffirmed the usefulness of the celestial navigation and will greatly serve as means of navigation in the occurrence of distress. Abstract should be placed here.

• Journal of Navigation and Port Research
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• v.37 no.1
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• pp.15-21
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• 2013

This paper investigates the mandatory minimum requirements for certification of officers in charge of a navigational watch on ship specified in the international convention of STCW. The training education and evaluation systems for navigational competence of Korean navy were compared and analyzed. The paper suggests adjustment of the evaluation range, increment of evaluation items, diversification of evaluation types, differentiation of certification-related education by officer's commissioning program in order to improve the PQS system.

• Publications of The Korean Astronomical Society
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• v.8 no.1
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• pp.207-241
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• 1993

본 연구에서는 북한에서 발행된 출판물을 통해서 북한의 천문학 교육과 연구 현황을 조사 분석하고 이를 남한의 실상과 비교하였다. 북한에는 국가 천문대로서 과학원 소속의 평양천문대가 있다. 이 천문대의 시설은 연구보라는 주로 실용성의 천문 관측을 위한 것들이다. 북한에는 교육용천문대로서 김일성종합대학 천문대, 평양학생소년궁전 천문대, 만경대소년궁전 천문대가 있다. 북한에서는 천문학 교육이 초등학교에서 대학까지 광범위하게 이루어지고 있지만 천체현상의 원리를 이해시키기보다는 현상의 설명에 치우치고 있다. 김일성 종합대학에서 천문학자가 양성되고 있으나 독립된 학과는 없고 물리학과에서 천문학 교육을 담당하고 있다. 남북한의 용어에는 상당한 차이가 나타나고 있다. 북한 용어의 특징은 우리말로 풀어서 만든 용어가 맡은 것이다. 북한에는 천문학의 단독학술지는 없고 단행본의 수도 극히 적다. 북한에서 발표되는 연구논문의 수는 매년 수편에 불과하다. 북한의 역서는 천문력과 항해력을 합친 것으로 방대한 분량을 수록하고 있다. 출판물에 나타난 북한의 천문학자수는 42명이고 그들 중 21명이 국채전문연맹 회원으로 등록되어 있다. 북한학자들은 천문학의 기초 분야보다는 태양 관련 분야나 위치천문, 인공위성 등 실생활과 관련 있는 연구를 주로 하고 있다. 앞으로 남북 교류가 이루어진다면 남한의 기초와 북한의 응용 분야가 결합해서 상호 보완적으로 천문학 수준 향상을 이룩할 수 있을 것으로 기대된다.

• The Science & Technology
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• v.9 no.9 s.88
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• pp.33-36
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• 1976

시간은 일상 생활에서 중요한 비중을 차지하고 있다. 천문관측을 기초로하여 시민 생활과 항해항공에 필요한 표준시간의 유지관리 및 경위도를관측하는 시보업무는 천문대에서 중요한 비중을 차지하며 일상 생활과 밀접한 관례가 있다.

• Journal of the Korean Institute of Navigation
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• v.13 no.2
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• pp.1-21
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• 1989

The computer can be used to display a continuously updated list or plot of vessel position. The computer that accept input data from a number of different navigation systems, e.g., Loran , Satnav, Radar, Decca, Compass, Sextant with electrical output etc., can compute the position of a vessel relative to prerecorded objects. The celestial navigation system requires the computer to do not much calculation. Calculation are for trigonometeric, linear systems, finding roots of nonlinear equation and least square estimation etc, . In order to computerize the celestrial navigation system, these calculations must be programmed. The purpose of this thesis is to study the formulation, the design and the test of calculations of the coordinates of celestial bodies, the altitude correction and the solution of the navigational triangle processes.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• v.2
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• pp.602-604
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• 2006

한국천문연구원(KASI)은 국제 GNSS 관측망(IGS)의 글로벌 데이터 센터(GDC)를 설립하였다. KASI GDC는 공식적으로 IGS GDC이고 세계 4번째로 설립되었으며, 아시아 및 오세아니아 지역에서는 최초이다. KASI GDC는 IGS GNSS 데이터를 기록하고, IGS GPS 데이터와 IGS 산출물을 인터넷을 통해 제공한다. GDC에서 다루는 데이터의 양은 매우 빠르게 증가한다. GDC 데이터의 대용량을 처리하기 위해서는 시스템의 높은 효율성과 신뢰성이 요구된다. 그래서 KASI GDC는 높은 신뢰성과 대용량 저장 장치를 필요로 하는 저장 시스템을 구성하기 위해 RAID와 LVM을 적용했다. KASI GDC의 공식 출범 이후 데이터 이용 현황을 확인하고, 항상 시스템이 Active 상태로 유지하기 위한 무정전 시스템 구성에 대해 기술한다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2009.06a
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• pp.13-14
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• 2009

Needs of Large Oil Recovery Vessels will be checked by Hebei Spirit Oil Spill in Korea in 2007, Nakhodka Oil Spill in Japan in 1997, Prestige Oil Spill in Spain in 2002. and offer a efficient proposals for practical use besides Catastrophic Oil Spill Response.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2004.04a
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• pp.217-224
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• 2004

Open-coast storm surge computations are of value in planning and constructing engineering works, especially in coastal regions. Prediction of typhoon surge elevations is based primarily on the use of a numerical model in this study, since it is difficult to study these events in real time or with use of physical models. A simple quasi-two dimensional numerical model for storm surge is considered. In order to understand the model's underlying assumptions, range of validity, and application, we discussed several aspects of typhoons and the physical factors governing storm generation processes. We also followed the basic governing equation, together with the assumption generally taken in their development, to see the principle characteristics of the model from a physical as well as a mathematical point of view. The equations consistent with the model described here are reduced forms of the basic equations and their effects on the resulting numerical scheme are discussed. Finally we applied the model discussed above to a storm surge problem at Masan Bay, the south coast of Korea Effects of astronomical tide, initial water level, and atmospheric pressure setup are considered. We then analyzed the flood at the coastal city and proposed a reasonable way of flood control.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.4
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• pp.846-854
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• 2017

In this paper, we proposed a method to reduce the error of compass by combining the ceiling technique used in the past with modern IT technology. We combined an encoder and the Azimuth Circle for applying an algorithm. The algorithm is able to calculate the true north by using astronomical observation. Finally, we implemented the embedded system possible to indicate various situations and perform calculations. As a result, it isn't only able to calculate the true north with an error of about $0.2^{\circ}$ but also takes less than 5 seconds. Originally, using astronomical observation requires more than 5minutes. So it is analyzed as convenient by solving the problem of taking lots of time. Especially, we present the tolerance less than $0.5^{\circ}$ by the analysis of the existing gyrocompass and the bearing standard of IMO. In conclusion, we clearly confirm that the results of this paper are possible to reduce the error of various compasses in a real world.

• Journal of Astronomy and Space Sciences
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• v.21 no.4
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• pp.505-528
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• 2004

We have reproduced the records of lunar occultation recorded in the History of Three Kingdoms(삼국사기), the History of the Koryo Dynasty (고려사), the Annals of the Choson Dynasty (朝鮮王朝實錄), the Daily Records of Royal Secretariat of the Choson Dynasty (승정원일기), and obtained the epochs of their realizations. We analysed these results to understand how the system of hours had been kept and when a day began. During most of the periods encompassed by these annals, the 12 double hours(12진각법) and the system of 100 divisions of the day (백각법) had been used when the lunar and the solar eclipses were calculated by royal astronomers. In these systems, the starting point of a day is midnight. On the other hand, the five watch system of hours (경점법), in which a night is divided into five watches, was also used. In this system, a day begins at the sunrise. We found that the traditional twilight, called dusk and dawn (혼명) and used in the east Asian countries, largely corresponds to the nautical twilight in modern concepts. This fact means that the Korean expressions and words for time system in every day life had originated form the five watch system of hours. We pointed out that the sunrise and sunset were convenient boundary lines to ancient astronomers, as well as to farmers in the agricultural society. Our results can be used to determine the exact epoch of each astronomical record in chronicles.