• Journal of the Korean Institute of Navigation
• /
• v.25 no.3
• /
• pp.247-256
• /
• 2001

This study aims to develop the information service system of integrated seakeeping performance for seagoing vessels. It has been successful in developing the intended system which has made possible to provide the following functions and capabilities. o immediate computation of the dynamic motions of a ship against the present and future weather conditions; o evaluation of the integrated seakeeping performance of a ship on a real time basis and providing the navigators with the seakeeping informations on the spot enabling them to take the most appropriate countermeasures; and o supporting the navigators in the selection of a safe sailing route by providing the integrate seakeeping performance.

• Journal of the Korean Institute of Navigation
• /
• v.25 no.3
• /
• pp.237-245
• /
• 2001

Radar is an indispensible equipment in all vessels under way. In Korea there are many fishing net buoys near the coast, which causes an enormous threat to safe navigation because it is very difficult to detect the buoys by radar due to their small radar cross section. In this study RTE(Radar Target Enhancer) was installed on the fishing net buoy and its echo was analysed carefully. The results showed the possibility of wide detection of targets, especially small targets such as fishing net buoys, navigation buoys and etc.

• Journal of the Korean Institute of Navigation
• /
• v.4 no.1
• /
• pp.1-18
• /
• 1980

As the NNSS system calculates ship's position by the doppler shift of the NNSS radio waves caused by the change of the distance between Transit Satellite and the ship, ship's speed error inevitably results in the position error, and moreover this kind of erroris most dominant compared with other errors especially in high speed ships and airplanes. Most NNSS receivers now in use have adoptedsuccessive short doppler counts as positioning data and by investigating the dispersion of serval successive positions calculated and by neglecting the mean position having dispersion of over certain threshold level, more accurate adn safe position is to be achieved. This paper proposes the method of finding ship's true speed by selecting a speed having least position dispersion for given successive doppler counts. And by computer simulation it was verified that the method proposed here is reasonable in finding the ship's desired correct speed together with the correct ship's position.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10c
• /
• pp.640-642
• /
• 2002

오늘날 포트 스캔과 같은 취약점 분석 도구들의 보급 확대로 인해 공공의 호스트나 개인 호스트들의 침입 사례가 증폭되고 있는 실정이다. 더욱이, 포트 스캔의 공격 형태 또한 나날이 그 기법이 지능화와 더불어 서비스 거부 공격을 이용한 시스템 무력화라는 형태로 발전하고 있어 기존의 시스템으로는 탐지와 대응에 어려움이 가중되고 있다. 따라서 본 논문에서는 이러한 지능적이면서 공격적인 포트 스캔에 대응하여 호스트를 효율적으로 유지할 수 있는 안전한 포트 스캔 탐지 시스템을 제안한다. 본 시스템은 기존의 NIDS 탐지 기법과는 달리 IP와 TCP 소켓 정보를 동시에 활용하여 포트 스캔을 이용한 서비스 거부 공격시에 적절한 대응책으로 동일 IP 주소에 따른 선택적 로그 파일 저장 기법과 해시 알고리즘을 이용한 데이터 저장 기법이라는 제반 사항들을 구현함으로써 현재 대부분의 탐지 시스템들이 간과하고 있는 포트스캔을 통한 서비스 거부 공격에 대한 일정 수준의 보호를 가능하게 하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2004.11a
• /
• pp.337-342
• /
• 2004

A construction project of Incheon 2nd bridge, which is connected between the Incheon Song-Do New Town and the Incheon International Airport in Young-Jong-Do, have been proposed by the private capital in 1999. But the optimal span width in the bridge main span have not been decided in spite of the three investigations into the feasibility of ship's safe transit in this planned bridge. In this paper, we study the economic analysis on port operational efficiency according to traffic schemes, me-way or two-way of vessels over 10,000G/T, in the bridge main span of this bridge. In this comparative result, total queueing time due to the one-way in the bridge main span is evaluated 20,362 hours in 2011 and 24,544 hours in 2020. Therefore the demurrage cost and the accumulation cost of freight are evaluated 19.7 billion won in 2011, and 23.3 billion won in 2020, then total accumulated costs during 33 years from 2008 until 2040 are evaluated about 768..9 billion won.

• Journal of Navigation and Port Research
• /
• v.29 no.1 s.97
• /
• pp.9-15
• /
• 2005

To design ship channel is one of important factors for planning and developing a port. In most case, the core factors for designing ship channel are the layout and width of channel provided the net underkeel clearance is secured to be safe enough to pass. In this study, Variable Bumper Area(VBA) model is applied to design and assess ship channel. This model reflects ship's particular, ship domain theory, ship speed and mariner's ship handling skill and experience, especially external forces which cause leeway, set and drift and the change of ship maneuvering characteristics. A real time, full mission shiphandling simulator is used to analyze ship dynamic data according to mariner's ship control, external forces, ete. This model defines Domain degree and Domain-index for assessing the efficiency and safety of the channel. The proposed model is applied to Ulsan new port plan which has a channel width of 1.5 times the length of the largest vessel, a radius of 5 times the length of the largest vessel in a curve of 57 degree centerline angle and SBM facility adjacent to the lateral edge of channel. The result of this study shows that the width of the channel and radius of channel curve are suitable for the target ship but the difficulty of ship handling is caused by the large course change and SBM located in the vicinity of channel.

• Journal of Navigation and Port Research
• /
• v.29 no.1 s.97
• /
• pp.65-69
• /
• 2005

A construction project of Incheon 2nd bridge, which is connected between the Incheon Song-Do New Town and the Incheon International Airport in Young-Jong-Do, has been proposed by the private capital in 1999. But the optimal width of the main span has not been decided in spite of the three investigations into the feasibility of ship's safe transit in this planned bridge. In this paper, we study the economic analysis on port operational efficiency according to traffic schemes, one-way or two-way of vessels over 10,000G/T, in the main span of this bridge. In this comparative result, total queueing time due to the one-way in the bridge main span is evaluated 20,362 hours in 2011 and 24,544 hours in 2020. Therefore the demurrage cost and the accumulation cost of freight are evaluated 19.7 billion won in 2011, and 23.3 billion won in 2020, then total accumulated costs during 33 years from 2008 until 2040 are evaluated about 768.9 billion won.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2004.11a
• /
• pp.175-181
• /
• 2004

A construction project of Incheon 2nd bridge, which is connected between the Incheon Song-Do New Town and the Incheon International Airport in Young-Jong-Do, have been proposed by the private capital in 1999. But the optimal span width in the bridge main span have not been decided in spite of the three investigations into the feasibility of ship's safe transit in this planned bridge. In this paper, we study the optimal main span width according to the traffic volume in the future traffic and the ship maneuverability of maximum size aspect. The result cf this study, Incheon 2nd bridge main span design is required to design two-way traffic scheme and 1,000m span width, which will satisfy the safe transit from the viewpoint of the traffic volume in the future traffic and the ship maneuverability maximum size.

• Journal of Navigation and Port Research
• /
• v.28 no.10 s.96
• /
• pp.933-940
• /
• 2004

A construction project of Incheon 2nd bridge, which is connected between the Incheon Song-Do New Town and the Incheon International Airport in Young-Jong-Do, has been proposed by the private capital in 1999. But the optimal width of the main span has not been decided in spite of the three investigations into the feasibility of ship's safe transit in this planned bridge. In this paper, we study the optimal width of the main span according to the traffic volume in the future traffic and the ship maneuverability of maximum size aspect. The result of this study, the channel in the main span of Incheon 2nd bridge is required to design two-way traffic scheme and the width of 1,000m, which will satisfy the safe transit from the viewpoint of the traffic volume in the future traffic and the ship maneuverability of maximum size.

• Journal of Navigation and Port Research
• /
• v.29 no.1 s.97
• /
• pp.43-58
• /
• 2005

Piracy is the enemy of the human race. Pirates commit acts of murder, robbery, plunder or other villainous deeds at sea, cruelly against humanity. The Republic of Korea(ROK), as a big maritime country, is obliged to suppress piracy under international treaties it ratified, including the UN Convention on the Law of the Sea and the two 1988 Conventions against maritime terrorism The Korean government is recently taking a positive attitude towards the regional cooperation which is necessary for the suppression of piracy in the waters of Southeast Asia In spite of the effects of international cooperation to prevent piracy, it is recently on an increasing trend every year. Such circumstances may have a bad effect on the sound development of world economy by means of trade at sea as well as treat to the safety of crews and safe operation of ships. This paper aims to suggest the countermeasures against piracy in terms of criminal law, civil law and international law in order to secure safe operation of vessels at sea.