http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
수산음향기법을 이용한 아산만 멸치(Engraulis japonicus)와 기타어군의 분포 및 현존량 추정
이형빈 ( Hyung Been Lee ),강돈혁 ( Don Hyug Kang ),임양재 ( Yang Jae Im ),이경훈 ( Kyoung Hoon Lee ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.5
The distribution and abundance of coastal fish species in Asan Bay, Korea, were estimated from hydroacoustic survey and net catches. Acoustic data were collected with 38 and 200 kHz from July to October of 2012, and converted to the nautical area scattering coefficient (NASC, m2/mile2) for 0.25 n·mile along ten transects. Japanese anchovy Engraulis japonicus was the dominant specie in the net catches. The virtual echogram technique was used to distinguish E. ja-ponicus from other species based on the differences in the mean volume backscattering strength (△MVBS) at 38 and 200 kHz. Engraulis japonicus and other fishes are mainly distributed in the center channel and outer part of Asan Bay. E. japonicus tends to move from inner to outer Asan Bay in summer and fall. From NASC data, the target strength and length-weight function of E. japonicus and other fishes were used to estimate the E. japonicus stock at 24.1-93.3 tons, and other fish at 40.6-88.4 tons from July to October 2012. The estimated anchovy biomass compared well with the cumulative catch weight from stow net catches. The hydroacoustic method offers an approach to understanding spatial/temporal structure and estimating the biomass of fish aggregations in coastal areas.
이형빈 ( Hyung Been Lee ),이경훈 ( Kyoung Hoon Lee ),김성훈 ( Seong Hun Kim ),김인옥 ( In Ok Kim ),강돈혁 ( Donh Hyug Kang ) 한국수산과학회 2014 한국수산과학회지 Vol.47 No.6
Hydroacoustic surveys were conducted for spatio-temporal distribution and size estimation of fish in the Yongdam reservoir, Korea, from April to July 2014. Acoustic data were collected along acoustic transects using a 120 kHz scientific echosounder. The received acoustic data were the in situ acoustic target strength (dB) and nautical area scattering coefficient (m2/mile2). Data on fish behavioral patterns and size were collected using a DIDSON acoustic camera at stationary stations. Fish were mainly distributed in the center channel and close to the outer Yongdam reservoir. Acoustic density of fish in the summer season were higher than in the spring season. The seasonal vertical distribution pattern of fish aggregations may be strongly related to the vertical temperature structure. The size distribution of fish obtained from an acoustic camera correlated well with the acoustic size of fish from an echosounder.
2014년 동계 북부 동중국해 저층 트롤 및 음향학적 조사에 의한 저서어족생물자원의 분포특성 비교
허유심 ( Yu Sim Heo ),이형빈 ( Hyung Been Lee ),최정화 ( Jung Hwa Choi ),차형기 ( Hyung Kee Cha ) 한국수산과학회 2015 한국수산과학회지 Vol.48 No.6
This study examined the spatiotemporal distribution of demersal fish aggregations in the Northern East China Sea by conducting a trawl survey with hydroacoustic devices. A bottom trawl was used for this survey and fish density was determined from the catch data. Acoustic data were collected at frequencies of 38 and 200 kHz from November to December 2014 and converted into the nautical area scattering coefficient (NASC, m2/n.mile2). In the catch data analysis, the range of catch per unit area by station was 26-8,055 kg/km2 and for the acoustic data, that of the NASC was 0.45-34.80 m2/n·mile2. The values were significantly correlated. The combined results of both surveys found that the density was highest at St. 5 (33° 10.3´, 126° 23.3´) and lowest at St. 8 (33° 20.7´, 127° 36.3´). The application of hydroacoustic methods offers a new approach for estimating the biomass of demersal fish aggregations.
해운대 해수욕장에 설치된 해파리 차단망의 수중 안정성 분석
박성욱 ( Seongwook Park ),이동길 ( Dong Gil Lee ),양용수 ( Yong Su Yang ),이형빈 ( Hyung Been Lee ),이경훈 ( Kyoung Hoon Lee ),한민수 ( Min Soo Hahn ),이태화 ( Tae Wha Lee ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.1
The worldwide abundance of various jellyfish appears to have increased in coastal ecosystems in recent years. The enormous jellyfish blooms cause a variety of problems for the local ecology, fisheries, and aquatic-sports in coastal locations. In this study, jellyfish sting protection net was installed to ensure the safety and reduction of the inflow into the Haeundae beach. In order to confirm the stability of the protection net, the tension for protection net was measured from variation of current speed. The periods for maximum tension were observed correspond to the periods of maximum current speed. The maximum tension for protection net was measured up to 4,100 kg. From field evaluations, the jellyfish sting protection net has demonstrated to stability from the current and tide in the Haeundae beach.
음향기술을 이용한 내수면 주요어종의 음향산란특성과 연직분포
양용수 ( Yong Su Yang ),이경훈 ( Kyoung Hoon Lee ),황보규 ( Bo Kyu Hwang ),이형빈 ( Hyung Been Lee ),김인옥 ( In Ok Kim ),김성훈 ( Seong Hun Kim ) 한국어업기술학회 2014 수산해양기술연구 Vol.50 No.4
This study is aimed to understand the vertical distribution of fish in the daytime and nighttime using an acoustic survey in Yondam reservoir of Jeollabuk-do, and an acoustical backscattering strength of dominant species, bass (Micropterus salmoides) and a bluegill (Lepomis macrochirus), which are classified as the ecosystem disturbing species. The results showed that the fish school was distributed in the shallow areas of less than 10 m depth during the period of Aug. and Oct. where it had a strong thermocline, otherwise, it was distributed over 10-times density under stable water temperatures as 13℃ in Nov. There was no vertical patchiness difference between daytime and nighttime unlike the typical marine ecosystem. The dominant species were crucian carp, bluegill, bass. The hydroacoustic method can provide the spatial distribution and effective removal ways of the ecosystem disturbing species in inland fisheries.
윤은아 ( Eun-a Yoon ),이경훈 ( Kyoung Hoon Lee ),황강석 ( Kang Seok Hwang ),이형빈 ( Hyung Been Lee ),한인우 ( In Woo Han ),황두진 ( Doo-jin Hwang ) 한국어업기술학회 2016 수산해양기술연구 Vol.52 No.1
Changes in target strength (TS) values of sandfish when sandfish was alive and dead were investigated using ex-situ at 120 kHz. TS values measured by tilt angles with .50∼+50 degrees showed ranges from .71.0 to .53.3 dB for live sandfish, .63.1~.46.3 dB for thawed sandfish, and .70.0~.50.4 dB after 24 hours from thawed, respectively. It was shown that while TS values were similar between the case of live and the case of after 24 hours from thawed, mean TS values were higher by approximately 5 dB in the case of immediate thawed sandfish. It was also seen that TS values were similar between the case of thawed sandfish and the case of after 21 hours from live. The results showed that TS values of live sandfish were different from those of frozen sandfish. It implies that when estimating TS of frozen fish, the influx of bubbles and changes of body should be considered.