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      • SCOPUSKCI등재

        초음파를 이용한 유해적조의 실시간 음향탐지 시스템 개발 및 평가

        강돈혁(Donhyug Kang),임선호(Seonho Lim),이형빈(Hyungbeen Lee),도재원(Jaewon Doh),이윤호(Youn-Ho Lee),최지웅(Jee Woong Choi) 한국해양과학기술원 2013 Ocean and Polar Research Vol.35 No.1

        The toxic, Harmful Algal Blooms (HABs) caused by the Cochlodinium polykrikoides have a serious impact on the coastal waters of Korea. In this study, the acoustic detection system was developed for rapid HABs detection, based on the acoustic backscattering properties of the C. polykrikoides. The developed system was mainly composed of a pulser-receiver board, a signal processor board, a control board, a network board, a power board, ultrasonic sensors (3.5 and 5.0 MHz), an environmental sensor, GPS, and a land-based control unit. To evaluate the performance of the system, a trail was done at a laboratory, and two in situ trials were conducted: (1) when there was no red tide, and (2) when there was red tide. In the laboratory evaluation, the system performed well in accordance with the number of C. polykrikoides in the received level. Second, under the condition when there was no red tide in the field, there was a good correlation between the acoustic data and sampling data. Finally, under the condition when there was red tide in the field, the system successfully worked at various densities in accordance with the number of C. polykrikoides, and the results corresponded with the sampling data and monitoring result of NFRDI (National Fisheries Research & Development Institute). From the laboratory and field evaluations, the developed acoustic detection system for early detecting HABs has demonstrated that it could be a significant system to monitor the occurrence of HABs in coastal regions.

      • KCI등재

        해군함정의 영구자기장 감소를 위한 탈자기법

        김휘석(Hwiseok Kim),임선호(Seonho Lim),도재원(Jaewon Doh) 한국자기학회 2014 韓國磁氣學會誌 Vol.24 No.4

        강자성체로 이루어진 함정 선체의 자화에 의해 발생되는 자기장을 제어 및 최소화하는 것은 어뢰 및 기뢰로부터 함정의 생존성을 확보하기 위해 매우 중요한 일이다. 함정으로부터 발생하는 영구자기장 및 유도자기장은 각각 자기처리(탈자)와 소자의 방법으로 최소화 한다. 여러 각국의 해군들은 기뢰의 위협으로부터 함정을 안전하게 보호하기 위해 여러가지 대책들을 수립하여 엄격히 통제하고 있으며, 함정의 자기 정숙화와 관련한 독자적인 자기처리시설을 구축하여 운용하고 있다. 국내의 경우, LIG넥스원에서 신규 자기처리시설을 국내 개발하여 현재 전력화 완료 후 운용 중에 있다. The control and reduction of the magnetization of naval vessel is important technologies for safety against torpedo and sea mine installed magnetic sensors. In general, we used to conduct as a magnetic treatment for permanent magnetization reduction and to compensate induced magnetization using on-board-degaussing system for the naval vessel’s magnetic stealth. Navies have operated magnetic treatment facility in order to protect from sea mines. LIGNex1 Corp. has developed the magnetic treatment facility for the korea navy.

      • SCOPUSKCI등재

        남해 연안에 분포하는 해파리(Aurelia aurita, Cyanea nozakii)의 복수 개체에 의한 음향 표적강도 특성

        강돈혁(Donhyug Kang),김정훈(Junghun Kim),임선호(Seonho Lim) 한국해양과학기술원 2010 Ocean and Polar Research Vol.32 No.2

        Understanding the abundance and distribution of massive jellyfish is necessary to forecast where or when their blooms will happen. The acoustic technique is one of the most useful methods of obtaining information if the acoustic characteristics of the targets are known. This study was conducted to determine the acoustic target strength (TS, ㏈) of two jellyfish species, Aurelia aurita and Cyanea nozakii, in the southern coast of Korea. For the ex situ measurements, 120, 200, and 420 ㎑ split beam transducers were used, and jellyfish with various bell lengths were arranged to prepare multiple jellyfish. Under 2 vertical individuals, the mean TS for multiple A. aurita at 120, 200, and 420 ㎑ was -72.7, -71.7, and -68.2 ㏈, respectively. In the case of 5 vertical individuals, the mean TS of the species was -71.3, -68.2, and -62.0 ㏈. Finally, the mean TS of C. nozakii at 120, 200, and 200 ㎑ was -62.0, -60.3, and -58.2 ㏈ under 2 individuals and -58.1, -57.4, and -54.0 ㏈ under 4 individuals, respectively. For both species, higher numbers of jellyfish resulted in a higher TS. In addition, higher frequencies were associated with a higher TS for the same jellyfish. These TS results for two species can be used as essential data for the acoustic detection of jellyfish in an open ocean or coastal area.

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