• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.11 no.7
• /
• pp.1247-1253
• /
• 2007

The system phase noise spectrum distribution for COMS sensor data transmitter and receiver system was proposed in this paper. On the basis of the analyzed design parameter to reduce the phase noise effect in a receiver, the optimal system phase noise were proposed for raw, IRIT and HRIT data transmission that are sensor data, respectively. The proposed system phase noise provides the qualified transmission performance of sensor data and reduces the performance degradation due to phase noise generating in the transmission channel. Also the system phase noise spectrums are utilized in the design of frequency generation source for sensor data transmission and receiver system.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.390-390
• /
• 2011

본 연구는 기초기술연구회의 위성정보 활용 지원 운영사업(과제명: 위성영상을 이용한 하천정보 생산 및 활용에 관한 연구)의 연구비 지원에 의해 수행되었습니다. 지난 2010년 6월 발사된 천리안 위성이 약 9개월간의 정지궤도 시험운행을 마치고 본격적으로 위성자료 서비스를 시작함에 따라 한반도 악기상 관측 및 예측 정확도 향상에 기여할 것으로 예상된다. 최근 기후분야 외에도 수자원, 방재, 농업, 해양 등 다양한 응용분야에서 기상위성을 활용하고자 하는 연구가 수행되고 있으며 자료제공 시간의 단축과 기상자료 산출물의 제공으로 천리안 위성은 향후 광범위하게 활용 될 것으로 예상된다. 본 연구는 천리안 위성의 수자원 분야 활용을 위한 기반연구로 천리안 위성과 동일한 채널 특성을 보유한 MTSAT-1R 기상위성을 이용하여 면적강우량을 추정하고 이를 지상관측소를 이용하는 강우보정기법에 적용하며 강우산정 결과를 레이더 및 티센, 크리깅 등과 비교하였다. 강우추정은 NOAA NESDIS의 Power-law 공식을 이용하였으며 지상관측소를 이용한 강우보정은 조건부 합성기법을 적용하였다. 연구대상 유역은 충주댐 유역과 충주댐 유역 상류에 위치한 영월수위표 지점 상류유역을 대상으로 하였으며 레이더 차폐에 따른 레이더 강우량의 감쇄 효과를 분석하고 지형적 특성에 영향 받지 않는 기상위성을 이용한 강우량 산정 기법의 활용성을 제시하였다. 연구결과 레이더 차폐에 영향 받지 않는 영월 수위표 상류유역의 경우 레이더를 이용한 강우량 산정결과와 기상위성을 이용한 결과가 큰 차이가 없으나 전체 유역면적의 절반 정도가 레이더 차폐 지역에 포함되는 충주댐 유역의 경우 레이더를 이용할 경우 20%~35% 가량 강우량이 과소 추정되는 것으로 나타났다. 본 연구를 토대로 산악지형에 의해 레이더 차폐가 발생되는 유역에 대해 기상위성의 활용을 기대할 수 있을 것으로 판단되었다.

• Journal of Korea Ship Safrty Technology Authority
• /
• s.32
• /
• pp.46-56
• /
• 2012

해양사고 예방 또는 해양사고 시 2차 피해 감소를 위한 관점에서 안전수역, 안전항구 및 최적 수리장소의 제공 또는 제공되는 장소까지 안전한 수로의 안내는 해양선진국으로 갖추어야 할 핵심 해사안전 서비스의 하나로 볼 수 있다. Erika호 해양사고와 같은 중대사고로 큰 손해를 겪은 국제사회는 피난처의 중요성을 깨닫고 여러 해를 거친 검토 끝에 피난처의 제공목적, 선장과 구조자의 책임지침 등을 담은 IMO Res. A.949(23) 및 A.950(23)과 같은 피난처 관련 지침을 제정하게 되었다. 이 지침을 바탕으로 덴마크, 미국, 캐나다, 남아프리카에서는 MAS 체제, 잠재적 피난처(PPOR, Potential Places of Refuge), 국가비상계획 포함 등의 방법으로 피난처를 지정하여 활용하고 있었다. 위의 요소들을 고려할 때, 우리나라 연안을 통항하는 선박들에 대한 최적의 피난처를 지정하기 위해서 연안해역 및 항만의 자연환경, 해상 및 기상조건, 과거 해양사고통계 및 분석자료, 항적도 및 교통량 등 해상교통환경의 평가를 위한 기초자료가 수집되어야 한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2021.11a
• /
• pp.1383-1386
• /
• 2021

태풍 관련 해양 사고에 대한 구체적인 예방책이나 대책이 없는 현재 태풍 사고 예방을 위한 대책이 필요하다. 이에 본 논문에서는 빅데이터를 이용해 기상 예보, 현재 항해 중인 선박, 선박사고 지역 등을 나타내는 시스템을 구현하였다. 또한 본 논문에서는 사용자의 편의를 위해 국민의 대부분이 사용한다고 할 수 있는 스마트폰에서 사용할 수 있도록 애플리케이션으로 서비스를 제공할 수 있도록 개발하였다.

• Journal of Navigation and Port Research
• /
• v.32 no.1
• /
• pp.37-45
• /
• 2008

The research on an E-Navigation(E-Nav) strategy development has recently carried out by the IMO sub-committee on safety of navigation(NAV). The design of communication system architecture is a key factor in the E-Nav strategy development and it may drive the direction of a national R&D project on future navigational and marine communication systems. This study aims at designing a standard model of E-Nav communication network architecture, which enhances navigational safety and provides additional benefits in marine transportation. To achieve this purpose, authors have suggested E-Nav services, which are divided into five categories, i.e., safety and security, maritime meteorology, distress, business, and infotainment, by analyzing the related user requirements. As results, this paper proposes the E-Nav communication network architecture that consists of the navigation and communication equipments.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.22 no.3
• /
• pp.103-117
• /
• 2017

This note provides technical guide on three issues associated with establishing and automatically running regional ocean forecasting systems: (1) a strategy for continuous production of hourly-interval three-day ocean forecast data, (2) the daily download of ocean and atmospheric forecasting data (i.e., HYCOM and NOAA/NCEP GFS data), which are provided by outside institutions and used as initial condition, surface forcing, and boundary data for regional ocean models, and (3) error notifications to numerical model managers through the Short Message Service (SMS). Guidance on dealing with these three issues is illustrated via solutions implemented by the Korea Hydrographic and Oceanographic Agency, since in embarking on this project we found that this procedural information was not readily available elsewhere. This technical guide is based on our experiences and lessons learned during the process of establishing and operating regional ocean forecasting systems for the East Sea and the Yellow and East China Seas over the 5 year period of 2012-2016. The fundamental approach and techniques outlined in this guide are of use to anyone wanting to establish an automatic regional and coastal ocean forecasting system.

• Journal of the Institute of Electronics Engineers of Korea CI
• /
• v.49 no.2
• /
• pp.1-6
• /
• 2012

In recent years global climate change of hurricanes and torrential rains are going to significantly, that increase damages to property and human life. The disasters have been several claimed in every field. In future, climate changes blowing are keen to strike released to the world like in several movies. Reducing the damage of long-term weather phenomena are emerging with predicting changes in weather. In this study, it is shown how to predict the red tide phenomenon with multiple linear regression analysis and artificial neural network techniques. The red tide phenomenon causing risk could be reduced by filtering sensor data which are transmitted and forecasted in real time. It could be ubiquitous driven custom marine information service system, and forecasting techniques to use throughout the meteorological disasters to minimize damage.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2021.10a
• /
• pp.670-672
• /
• 2021

The video streaming technologies are used in diverse areas including aerospace. UAV (Unmanned Aerial Vehicle) is still being developed so that we are able to use the UAV not only in military areas but also in civil areas. Remotely monitoring and observing a certain area is possible via using video streaming service based on the UAV nowadays. However, UAV is vulnerable to weather conditions, plane's weight, battery capacity and so on, which makes many restrictions of flight time and video streaming services. In order to prolong the video streaming services, we can use a number of UAVs, fly them one by one, and switch video streaming channels. In the paper, we propose the methods how to interchange UAVs' missions and their video streaming channels to provide seamless video stream services.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2019.05a
• /
• pp.14-15
• /
• 2019

Pilotage & Tugs Assistance Service in Korean e-Navigation provides port monitoring which presents features of port by utilizing dynamic and static information of vessel, weather data, water way information and etc. It also supports process related to pilotage and tugs according to each user types. This study suggests how this services can be utilized after practicalization and describes expectation from applying this utilization. The Pilotage & Tugs Assistance Service is expected to be platform for Pilotage & Tug by further research and development.

• Journal of Satellite, Information and Communications
• /
• v.2 no.2
• /
• pp.41-47
• /
• 2007

The first geostationary satellite made by Korea, COMS, has the three different payload ; Meteorological sensor, Oceanographic sensor and Ka-band communication payload. There are Meteorological & Ocean Data Communication Subsystem(MODCS) and Telemetry, Command and Ranging Subsystem(TC&R) as other RF radiation sources. MODCS transmits and receives Meteo and Ocean measurement data from/to earth using L-band and TC&R using S-band. The Ka-band communication payload will provide high-speed multimedia services and communication services for natural disaster such as prediction, prevention, and recovery services in the government communications network.Ka-band beacon is for the earth antenna pointing and the experiment of rain fading. This paper gives the analysis results about the mutual radiation effect on Ka-band communication payload, Ka-band beacon, MODCS and TC&R. Up/Down link power and coupling factor including the geometrical position and distance of antenna, filter rejection and degradation factor due to the different polarization are considered. The results show MODCS and TC&R are compatible for Ka-band communication payload and Ka-band beacon does not interfere with MODCS and TC&R normal operation.