• 한국멀티미디어학회논문지
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• 제13권1호
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• pp.122-132
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• 2010

해양 환경 분석은 해양탐사에 필수적인 정보들을 제공한다. 그러나 해양 환경은 해류에 의한 노드의 이동과 염수에 의한 부식, 전파감쇠와 다중경로 발생, 그리고 센서 노드 설치의 어려움 등 다양한 환경변수가 존재한다. 따라서 해양 데이터 통신은 지상통신 환경과는 달리 이러한 환경적 제약 요소로 인해 해양 환경의 데이터들을 수집하는 과정이 복잡하고 힘들다. 이를 해결하기 위해 해양 환경과 유사한 경포호에서 실제 실험을 통해 수질 환경 모니터링을 위한 해양 데이터 통신망을 구축한다. 따라서 본 논문은 경포호 환경 모니터링 시스템의 구축을 통해 환경적 장애요소를 극복하고 해양 환경 모니터링을 위한 센서 노드들의 배치, 그리고 통신 환경의 효과적인 구조를 정의하는데 목적이 있다.

• Ocean and Polar Research
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• 제27권4호
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• pp.451-461
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• 2005

The $CO_2$ storage in geologic and oceanic reservoirs is considered to be one of the carbon management strategies for responding to global climate change. Ocean carbon sequestration is purposeful storage acceleration into the ocean of large amounts of carbon that would accumulate in the atmosphere and naturally enter the ocean over a longer timespan. Some technologies for $CO_2$ ocean sequestrations have been developed as a nation project. However, $CO_2$ ocean sequestrations are attractive because they have the advantage of vast capacity sequestration far away from industrial areas, and offer easier monitoring whereas less economic advantage has been indicated as one of the key barriers compared with $CO_2$ geosphere sequestration, which is produced as a byproduct. In this paper, a conceptual design for $CO_2$ ocean sequestration is introduced, and the preliminary examination is described. As a result, the $CO_2$ price, US$ 24/t shows far away from the economics. The causes come from the expensive $CO_2$ recovery cost and the low $CO_2$ price. The expensive $CO_2$ recovery cost is because too much electricity and water are consumed. In order to look for an economic balance point for $CO_2$ ocean sequestration, NPV=0, it is increases the $CO_2$ price. Finally 60.4$ per ton is found to be the balance price.

• Ocean and Polar Research
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• 제43권2호
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• pp.53-63
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• 2021

Changes in a marine environment have a broad socioeconomic implication on fisheries and their relevant industries so that there has been a growing demand for the medium-range (months to years) prediction of the marine environment Using a medium-range ocean prediction model (Ocean Mid-range prediction System, OMIDAS) for the northwest Pacific, this study attempted to assess seasonal difference in the mid-range predictability of the sea surface temperature (SST), focusing on the Korea seas characterized as a complex marine system. A three-month re-forecast experiment was conducted for each of the four seasons in 2016 starting from January, forced with Climate Forecast System version 2 (CFSv2) forecast data. The assessment using relative root-mean-square-error was taken for the last month SST of each experiment. Compared to the CFSv2, the OMIDAS revealed a better prediction skill for the Korea seas SST, particularly in the Yellow sea mainly due to a more realistic representation of the topography and current systems. Seasonally, the OMIDAS showed better predictability in the warm seasons (spring and summer) than in the cold seasons (fall and winter), suggesting seasonal dependency in predictability of the Korea seas. In addition, the mid-range predictability for the Korea seas significantly varies depending on regions: the predictability was higher in the East Sea than in the Yellow Sea. The improvement in the seasonal predictability for the Korea seas by OMIDAS highlights the importance of a regional ocean modeling system for a medium-range marine prediction.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2023년도 춘계학술대회
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• pp.158-159
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• 2023

해양위성의 발달과 첨단화로 우리나라 주변 해역의 광역적인 관리가 가능해졌다. 특히 선박운항 분야에서도 인공지능 및 빅데이터에 기반한 자율운항 기술개발이 이루어짐에 따라, 해양위성자료를 통한 분석 및 관측의 필요성이 있다. 해양위성자료에 선박운항분야를 접목할 수 있는 연구는 해양위성 기반 선박탐지, 해양 환경/기상 예측을 활용한 선박운항 보조 등이 있다.

• 한국항해항만학회지
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• 제38권5호
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• pp.437-442
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• 2014

해양리터러시는 우리에게 바다가 미치는 영향 그리고 우리의 삶이 바다에 미치는 영향을 이해하는 것이다. 본 연구에서는 이러한 해양리터러시 개념에 기반한 부산지역 23개 기관에서 시행하고 있는 해양교육 프로그램을 분석하여 7개의 해양교육 모델코스를 개발하였다. 7개의 해양교육 모델코스는 실내이론, 실내체험, 현장탐방, 현장체험 등 4가지 형태의 교육방법이 다양하게 조합되어 있다. 또한 이러한 해양교육을 학생과 일반인들이 쉽게 구분하고 선택할 수 있도록 76cm*56cm 크기의 해양교육 안내지도를 제작하였다. 이는 부산지역의 지리적 여건과 관광지가 결합된 형식이며, 교육기관, 교육내용, 교육시간 등 상세한 내용이 포합되어 있어서 수요에 따라 계절적 변화요인 또는 기호에 맞게 피교육생들이 탄력적으로 운영이 가능하다. 해양교육 모델코스를 이용한 해양교육 안내지도의 제작은 해양교육의 활성화를 위한 초석이 될 것이며, 해양교육의 궁극적인 목표인 해양의식 함양과 바다와의 친숙화를 통한 해양전문인력 육성을 유도할 수 있을 것이다. 또한 해양교육용 교재 및 부교재의 개발, 교육보조재를 활용한 실내교육의 단점보완, 동영상 콘텐츠 개발을 통한 사이버 해양교육 개발 등을 통한 후속연구가 지속되어야 할 것이다.

• Ocean and Polar Research
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• 제43권4호
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• pp.229-243
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• 2021

Quality control (QC) to process observed time series has become more critical as the types and amount of observed data have increased along with the development of ocean observing sensors and communication technology. International ocean observing institutions have developed and operated automatic QC procedures for these observed time series. In this study, the performance of automated QC procedures proposed by U.S. IOOS (Integrated Ocean Observing System), NDBC (National Data Buy Center), and OOI (Ocean Observatory Initiative) were evaluated for observed time-series particularly from the Yellow and East China Seas by taking advantage of a confusion matrix. We focused on detecting additive outliers (AO) and temporary change outliers (TCO) based on ocean temperature observation from the Ieodo Ocean Research Station (I-ORS) in 2013. Our results present that the IOOS variability check procedure tends to classify normal data as AO or TCO. The NDBC variability check tracks outliers well but also tends to classify a lot of normal data as abnormal, particularly in the case of rapidly fluctuating time-series. The OOI procedure seems to detect the AO and TCO most effectively and the rate of classifying normal data as abnormal is also the lowest among the international checks. However, all three checks need additional scrutiny because they often fail to classify outliers when intermittent observations are performed or as a result of systematic errors, as well as tending to classify normal data as outliers in the case where there is abrupt change in the observed data due to a sensor being located within a sharp boundary between two water masses, which is a common feature in shallow water observations. Therefore, this study underlines the necessity of developing a new QC algorithm for time-series occurring in a shallow sea.

• 한국해양공학회지
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• 제33권4호
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• pp.350-357
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• 2019

The development of marine technology is expected to increase the demand for marine plants because of increasing oil prices. Therefore, there is also expected to be an increase in the demand for cylindrical structures such as URF (umbilical, riser, flowline) structures and spars, which are used operating in various seas. However, a cylindrical structure experiences vortex induced motion (VIM) in a current. In particular, for risers and umbilicals, it is important to identify the characteristics of the VIM because interference between structures can occur. In addition, various studies have been conducted to reduce VIM because it is the cause of fatigue damage to structures. The helical strake, which was developed for VIM reduction, has an excellent VIM reduction performance, but is difficult to install on structures and has a negative effect on heave motion. Therefore, the purpose of this study was to supplement the shortcomings of the helical strake and develop a high-performance reduction device. In the reduction device developed in this study, a string is placed around the structure inside the flow, causing vibration. The vibration of this string causes a small turbulence in the flow field, reducing the VIM effect on the structure. Finally, in this study, the 2-DOF motion characteristics of models without a suppression device, models with a helical strake, and models with a string were investigated, and their reduction performances were compared through model tests.

• 해양환경안전학회:학술대회논문집
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• 해양환경안전학회 2018년도 공동국제학술발표회
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• pp.186-186
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• 2018

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 1995년도 수산관련공동학술대회발표요지집
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• pp.373-374
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• 1995

• 한국해안해양공학회:학술대회논문집
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• 한국해안해양공학회 2001년도 한국해안해양공학발표논문집 Proceedings of Coastal and Ocean Engineering in Korea
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• pp.102-107
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• 2001