• 한국항해항만학회지
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• 제38권2호
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• pp.185-191
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• 2014

2012년은 게라르드 메르카토르가 탄생한 지 500주년이 되는 해였다. 1512년에 태어난 메르카토르는 1569년 <항해자들이 활용할 수 있도록 새롭게 증보된 지구전도>를 간행하였다. 총 18장으로 구성된 이 지도는 '항정선'을 직선으로 표시하여 항해용으로 활용할 목적으로 제작되었다. 이로 인해 고위도의 형상은 크게 확대되는 결과가 초래되었지만, 지도상의 두 지점을 연결하면 간단하게 선박의 침로를 직선으로 표시할 수 있다는 장점이 있었다. 메르카토르는 애초부터 1569년 세계 지도를 항해용으로 제작하였으나, 당시대에는 이러한 장점이 널리 인식되지 못하였다. 그러나 1599년 에드워드 라이트와 1645년 헨리 본드 등의 수학자들이 그의 도법을 수학적으로 설명하고 입증함으로써 메르카도르 도법은 항해용 해도의 표준이 되어 갔다. 그의 사후 450여년이 흐른 오늘날 전자해도도 메르카토르 해도에 의거하여 제작된 것이라는 점에서 메르카토르는 항해사의 발전에 기여한 위대한 인물로 인식되어야 한다. 이 논설은 메르카토르 탄생 500주년을 기념하여 그의 삶과 메르카토르 해도, 그의 해도의 보급과 그로 인한 항해 안전에의 기여도 등을 정리한 것이다. 이를 통해 오늘날 표준 항해용 해도로 널리 사용되고 있는 메르카토르 해도의 제작자로서 메르카토르가 항해사의 발전에 기여한 바를 재인식시키고자 하였다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 1995년도 춘계학술발표회 논문집
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• pp.65-92
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• 1995

The final aim of our research project is a study on assessment of automatic steering system of ships in open seas. In order to achieve this aim we need to know the characteristics of each component of the system and also to know the characteristics of disturbance to ship dynamcis. In this paper we provide calculation method of irregular disturbance to ships in autopilot navigation in open seas and also show calculation examples about two kinds of ship ore carrier and fishing boat. The disturbance consists of irregular wave and random wind, The disturbance is calculated as equivalent yaw angular velocity. Each spectrum and time history of disturbance are reasonably evaluated. Further investigation concerning to performance index of autopilot system and energy loss related to automatic course keeping will be dealt with in another paper,

• 한국항해학회지
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• 제19권2호
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• pp.1-12
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• 1995

The final aim of our research project is a study on assessment of automatic steering system of ships in open seas. In order to achieve this aim, we need to know the characteristics of each component of the system, and also to know the characteristics of disturbance to ship dynamics. In this paper, we provide calculation method of irregular disturbance to ships in autopilot navigation in open seas, and also show calculation examples about two kinds of ship, ore carrier and fishing boat. The disturbance consists of irregular wave and random wind. The disturbance is calculated as equivalent yaw angular velocity. Each spectrum and time history of disturbance are reasonably evaluated. Further investigation concerning to performance index of autopilot system and energy loss related to automatic course keeping, will be dealt with in another paper.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2012년도 추계학술대회
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• pp.332-334
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• 2012

본 연구는 우리나라 선박 및 항해와 관련된 항로표지 업무를 관장하기 위해 설치된 국가제도 등에 관한 기록들을 주요 역사서를 통해 살펴보고, 삼국시대부터 봉수(烽燧)와 봉화(烽火) 같은 횃불을 밝혀 선박의 안전항해를 돕기 시작하여 근대 이후에는 석유등, 아세틸렌가스등, 전기등, LED 광원을 등대광원으로 사용한 변천과정을 알아본다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.331-336
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• 2002

Satellite positioning technology has been widely used in all kinds of military and civil land, marine, space and aeronautical target positioning tasks, navigation activities and accurate surveying measurements since 90s in the last century due to it advantage in providing all-weather, real-time, three dimensional and high precision positioning information, as well as speed and accurate timing information. By now, it has already formed a new hi-tech industry basically. This paper briefly reviews the development of the global satellite positioning and navigation technologies including the basic information of China′s "Plough navigation system", introduces the history of satellite positioning technology and its major application fields as well as the status quo of this being industrialized trade in China, gives an account of the writers′ vision for the application and prospect of the satellite positioning technologies in China, and approaches the tactics and stresses of the satellite positioning technology′s application and its industrialization future in China.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.73-76
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• 2006

Pilots and navigators have through history used everything available to support them in the execution of their task. From the simple sounding means (for instance a stick or a line with a heavy object tied to it) to the advanced electronic support systems that are available today. This means that apart from the more traditional side of his set of tasks the influence of modern technology is felt. In general it concerns such diverse and complex subjects that it requires the pilot to remain up to date with regard to the most modern techniques. In a sense this also concurs with the change form a provider of (local) knowledge to that of a manager of a high risk operation. More information flows can reach the pilot on the place where he executes his profession. With marginal scope the pilot has to translate such information to the situation in which he finds himself in order to give a balanced advice. Knowledge of the surroundings, variable circumstances in his specific area but also language and culture play a crucial role. This paper touches on the history of pilot support systems and examines the developments of pilot support systems in the present day operating environment and addresses the implications. These range from the historic basic needs for pilot information to the present and future possibilities, supporting the pilot to make the most precise assessment at each operational stage to continually execute a safe journey in and out of port.

• 한국항해항만학회지
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• 제26권3호
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• pp.345-354
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• 2002

8-9세기는 무슬림 상인의 주도로 페르시아만에서 남중국까지의 해로가 활성화되는 시기이다. 동서교류에서 해로가 육로를 능가하는 이 시기에는, 이 간선 해로를 따라 그 동단인 동아시아해역과 그 서단인 지중해 해역이 설정되었다. 먼저 간선 해로에 관해, 기존 연구에서 미진하게 검토한 페르시아만에서 인도 동쪽 바다까지의 왕복 항로와 아랍선박을 검토하였으며 심해항행이 진행되었다는 것을 지적하였다. 다음으로 이 시기에 동아시아해역의 해상무역이 장보고의 활약으로 활성화되었던 것과는 달리, 지중해 해역은 로마제국 시대의 활기를 잃고 상대적으로 위축되어 있다는 것을 지적하였다.

• 한국항해학회지
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• 제21권4호
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• pp.66-92
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• 1997

Even though marine casualities are recently occuring so frequently in territorial sea or beyond, that causing danger to navigation, yet no international regimes are officially made to cope with such an impediment efficiently. However, Internatinal Maritime Organization (IMO) commenced to work for adopting an appropriate internaitnal convention on wreck removal under co-operation with Comite' Maritime International (CMI). The legal committee of the CMI has already provided full comments on draft convention of the wreck romoval and duly submitted to IMO as a reference which was made on the basis of their principles of unification and harmonization. Accordingly, this paper re-arranged in order aiming to understand easily for legal aspects of the draft convention comprehensively in accordance with full contents provided by the CMI. To avoid any improper applicationor undue interpretation after fixing of the convention , every coastal state which has keen interests should trace its background of legal information from initial stage. Accordingly, the paper will contribute not only to realize how to draw a whole legal picture including specific articles on the convention fixable in the future but also to the national legislation with understanding full legal history of the convention.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2006년도 International Symposium on GPS/GNSS Vol.1
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• pp.21-26
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• 2006

This paper focuses on modeling and predicting differential GPS corrections transmitted by marine radio-beacon systems using artificial neural networks. Various neural network structures with various training algorithms were examined, including Linear, Radial Biases, and Feedforward. Matlab Neural Network toolbox is used for this purpose. Data sets used in building the model are the transmitted pseudorange corrections and broadcast navigation message. Model design is passed through several stages, namely data collection, preprocessing, model building, and finally model validation. It is found that feedforward neural network with automated regularization is the most suitable for our data. In training the neural network, different approaches are used to take advantage of the pseudorange corrections history while taking into account the required time for prediction and storage limitations. Three data structures are considered in training the neural network, namely all round, compound, and average. Of the various data structures examined, it is found that the average data structure is the most suitable. It is shown that the developed model is capable of predicting the differential correction with an accuracy level comparable to that of beacon-transmitted real-time DGPS correction.

• Journal of Astronomy and Space Sciences
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• 제35권3호
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• pp.119-131
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• 2018

In spite of a short history of only 30 years in space development, Korea has achieved outstanding space development capabilities, and became the $11^{th}$ member of the "Space Club" in 2013 by launching its own satellites with its own launch vehicle from a local space center. With the successful development and operation of more than 10 earth-orbiting satellites since 1999, Korea is now rapidly expanding its own aspirations to outer space exploration. Unlike earth-orbiting missions, planetary missions are more demanding of well-rounded technological capabilities, specifically trajectory design, analysis, and navigation. Because of the importance of relevant technologies, the Korean astronautical society devoted significant efforts to secure these basic technologies from the early 2000s. This paper revisits the numerous efforts conducted to date, specifically regarding flight dynamics and navigation technology, to prepare for future upcoming planetary missions in Korea. However, sustained efforts are still required to realize such challenging planetary missions, and efforts to date will significantly advance the relevant Korean technological capabilities.