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음향 텔레메트리 기법을 이용한 자연산과 양식산 감성돔의 행동특성 비교 (Comparison of behavior characteristics between wild and cultured black seabream Acanthopagrus schlegeli using acoustic telemetry)

  • 강경미;신현옥;강돈혁;김민서
    • 수산해양기술연구
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    • 제44권2호
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    • pp.141-147
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    • 2008
  • Acoustic telemetry technique is one of useful tools to get behavioral information of the free-swimming fish. In this study, we conducted acoustic telemetry using coded acoustic transmitters to compare behavior characteristics between wild and cultured black seabream Acanthopagrus schlegeli, one of target species to promote resource in the marine ranching area. Two wild fish and five cultured fish were released in the marine ranching area after tagging surgically. Three of cultured fish were domesticated using the remote acoustic conditioning system for 3 weeks before being released. Two wild fish stayed at the released point for 2 hours and 9 days, respectively. One of wild fish was found about 10.8km away from the released point after 5 months. Two cultured fish stayed at the released point for 6 days and 75 days, respectively. One of acoustic conditioned fish stayed at the released point for 131 days and then was found about 10.1km away from the released point after 25 days. Others stayed at the released point during this study period(159 days).

음향 텔레메트리에 의한 조피볼락의 귀소범위 및 귀소경로 측정 (Home Ranges and Homing Routes of the Black Rockfish Sebastes schlegeli Measured by Acoustic Telemetry)

  • 강경미;신현옥
    • 한국수산과학회지
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    • 제41권3호
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    • pp.221-227
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    • 2008
  • The black rockfish (Sebastes schlegeli) is an important commercial species in Korean fisheries. We used acoustic telemetry using coded ultrasonic transmitters to track the home ranges and homing routes of the black rockfish that inhabit in the Tongyeong marine ranching area. Twenty-four fish were released at five points. The distance from the capture point (C1) to the released point was 0 (R7), 0.2 (R1), 0.9 (R2), 1.3 (R3) and 1.9 (R4) km. Two of the three fish released at R1 (0.2 km) returned home in under 48hrs. Another was found 0.8km from C1. Two of the five fish released at R2 returned home, but it took over 250 days. None of the ten fish released at R3 and R4 returned home. Three of the ten fish moved 1.1-2.6 km from C1 and were found near a cage or a natural reef. Six fish were released at R7. The younger the fish, the wider was its movement range around the artificial reefs. Fish over 3 years old were likely to move less far.

Movement Ranges and Routes of Black Rockfish Sebastes schlegeli in Summer and Autumn from Acoustic Telemetry

  • Kang Kyoung-Mi;Shin Hyeon-Ok
    • Fisheries and Aquatic Sciences
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    • 제9권2호
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    • pp.91-96
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    • 2006
  • The movement range and diurnal behavior of 17 wild black rockfish (Sebastes schlegeli) were monitored within the marine ranching area of Tongyeong from 27 July to 7 November, 2005 using acoustic telemetry. Coded transmitters were surgically implanted into the abdomen of fish. Two of ten fish released in summer moved about 2 km away from the capture point for 1 day. The others stayed within a 500-m radius of the release point for 1 week after release. The seven fish released in autumn stayed within 500 m of the release point. Most fish were more active and had a greater range of horizontal diurnal movement at night than during the day. Additionally, the range of horizontal diurnal variation was greater in summer than in autumn. While fish released in summer were more vertically active at night than during the day, those released in autumn preferred to move vertically during the day.

북한산국립공원 계획 타당성검토 구역조정의 개발 영향 (Development Impact Based on Area Adjustment of Feasibility Review in Bukhansan National Park Planning)

  • 조우
    • 한국환경생태학회지
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    • 제35권3호
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    • pp.305-312
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    • 2021
  • 본 연구는 제2차 국립공원 구역조정 시기(2010년~2011년) 해제지역의 건축물 조성 등 건축 행위, 공시지가 등 사회·환경적 요인의 변화를(2011년→2021년), 같은 기간 존치지역과 비교하여 개발 영향을 분석하고자 하였다. 해제지역은 2011년 이후 약 16,431m2 당 1개소의 건축물이 조성되었다. 그리고 건축물의 층수, 높이 모두 증가하였고 주요용도는 제2종 근린생활시설이 가장 높은 비중을 차지하는 것으로 분석되었다. 개별공시지가의 해제지역 증가율은 42.3%이었고 존치지역은 38.6% 로 두 지역 모두 상승하였다. 시도별 분석 결과 서울은 해제 및 존치지역 전체 공시지가가 평균 55.2% 상승하였고 경기도는 평균 9.4% 상승하여 서울지역의 공시지가 상승폭이 훨씬 컸다. 국립공원내 사유재산권에 대한 문제는 제2차 국립공원 구역 조정에 의해 해제됨으로써 상당부분 해결되었으나 향후 공원관리청은 용도지구 및 시설계획에 대한 조정 등 합리적 대안을 제시함으로써 토지 소유자들의 편익을 도모할 필요가 있다.

건설업 BSI와 산업생산지수 간의 선후행성 (The Lead-Lag Relationship between BSI and Industrial Production Index in Construction Industry)

  • 유한수
    • 토지주택연구
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    • 제11권3호
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    • pp.33-37
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    • 2020
  • The aim of this paper is to scrutinize the relation between Business Survey Index and Industrial Production Index in construction industry, stated in another way, the relation between CEO's expectations of future business status and real business activity in construction industry. Previous papers on this research area have been examined the relation between released BSI and released IPI. However, this paper focuses 'the relation between released BSI and the long-run component of IPI' and 'the relation between released BSI and the short-run component of IPI'. The first step is to decompose released IPI by unobserved component model. The long-run component of IPI is set up as a random walk process. And short-run component is set up as a stationary AR(1) process. The findings are as follows. First, released BSI Granger causes unidirectionally released IPI. Second, there exists one-way Granger causality from released BSI to long-run component of IPI. Third, Granger causality does not exist between released BSI and 'short-run component of IPI'. BSI increases IPI in the second or third month. These findings of this paper mean that CEO's expectations may influence industrial production in construction industry.

동진강 해역 표층 퇴적물 중 인의 화학적 형태별 함량 (Fractions of Phosphorus in the Surficial Sediment of Dongjin Sea Area)

  • 이현정;손재권;박봉주;조재영
    • 농촌계획
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    • 제11권4호
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    • pp.25-31
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    • 2005
  • The present study was carried out to investigate the P fractions of surfical sediment of Dongjin sea area. Furthermore, potential released loading of adsorbed and non-apatite inorganic phosphorus were investigated in the sediment of Dongjin sea area. The contents of phosphorus fractions of the surficial sediment in Dongjin sea area were adsorbed-P 0.06%, nonapatite inorganic-P 13.02%, apatite-P 60.22%, and residual-P 26.70%. The most abundant fraction was apatite-P, residual-P, nonapatite inorganic-P, and adsorbed-P followed it. Potential released loading of adsorbed and non-apatite inorganic phosphorus surveyed 2.6 and 597ton respectively. These results show that sediment-managing and interception from external pollution are needed for water environmental maintenance of Dongjin sea area.

미세 유체통로를 이용한 대면적 평판 구조의 부양에 관한 연구 (Study on the Micro Channel Assisted Release Process)

  • 김재흥;이준영;김용권
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 하계학술대회 논문집 C
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    • pp.1924-1926
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    • 2001
  • A novel wet release process ($\mu$ CARP - Micro Channel Assisted Release Process) for releasing an extreme large-area plate structure without etching hole is proposed and experimented. Etching holes in conventional process reduce a effective area and degrade an optical characteristics by a diffraction. In addition, as the area of a released structure increases, the stietion becomes more serious. The proposed process resolves these problems by the introduction of a micro fluidic channel beneath the structure which will be released. In this paper, a 5 mm${\times}$5mm-single crystal silicon plate structure was released by the proposed $\mu$CARP without etch holes on the structure. The variation in etching time with respect to the of the introduced micro channel is also examined. This process is expected to be beneficial for the actuator of a nano-scale data storage and the scanning mirror.

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바람장의 공간적.시간적 해상도가 누출물질 확산에 미치는 영향 (Effects of Spatio-Temporal Resolution of Diagnostic Wind Field on the Dispersion of Released Substance)

  • 김영성
    • 한국대기환경학회지
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    • 제16권4호
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    • pp.327-338
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    • 2000
  • complexity in atmospheric environment coupled with shoreline and complex terrain often causes local variations of meteorology that are distinct from those representative over larger surrounding area, These kinds of local variations are less significant in usual long-term environmental impact analyses dealing with continuous plume. The variations could however be crucial in predicting dispersion of toxic substance released in a relatively small area for a short duration. In the present paper the effects of spatial and temporal resolution of diagnostic wind field on the dispersion of the released substance are investigated by using a puff model. A hypothetical release scenario assumes that a substance is released from a location in the Yochon Industrial Estate and passively dispersed within a few-kilometer distance for an hour. The results show that diagnostic analysis could resolve more spatial variations to some extent by employing smaller grid size. The peak concentrations and puff trajectories obtained from spatially -and/or tmeporally -varing diagnostic wind field are found appreciably different from those obtained from uniform wind field. Attention to high-resolution wind field in the both spatial and temporal spaces is called in the consequence analysis of toxic substance release.

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남해도 주변해역에서 서식하는 어류의 종조성 및 양식산 방류 볼락(Sebastes inermis)의 행동특성 (Species Composition and Behavioral Characteristics of Released Black Rockfish, Sebastes inermis in the Coastal Waters off Namhae Island, Korea)

  • 안철민;곽석남;박주면;허성회
    • 한국수산과학회지
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    • 제43권3호
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    • pp.262-269
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    • 2010
  • Seventeen fish species were counted in an underwater visual census, and the most common species, Sebastes inermis and Halichoeres poecilopterus, were released. More than 60% of the released S.inermis occurred near a fish farm 5 days after release, but they moved to a distant rocky area, and decreasing numbers were seen near the farm 90 days after release. In pots, a total of 722 individuals belonging to 43 species occurred, and released S.inermis dominated with 174 individuals recaptured during the study period. The other common fish species were Stephanolepis cirrhifer and Acanthopagrus schlegeli. The percentage of recapture was 0.23%, but declined to 0.12% at 90 days after release. The potential predators of released S.inermis included Lateolabrax japonicus and Sebastes schlegeli.

새만금 사업지구의 연안해역에서 부영양화관리를 위한 생태계모델의 적용 -1. 해역의 수질 특성 및 저질의 용출 부하량 산정- (Application of Ecosystem Model for Eutrophication Control in Coastal Sea of Saemankeum Area -1. Characteristics of Water Quality and Nutrients Released from Sediments-)

  • 김종구;김양수
    • 한국수산과학회지
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    • 제35권4호
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    • pp.348-355
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    • 2002
  • To know characteristics of water quality in Saemankeum area, we were investigated the water quality of surface layer from July of 1999 to June of 2000. The concentrations of COD and chlorophyll a were in the range of $0.64\~6.40$ (mean 1.96)mg/L, $1.95\~51.55$ (mean 11,07)$mg/m^3$, respectively. The annual mean concentrations of DIN, DIP were found to be 21.182 $\mu$g-at/L and 0,655 $\mu$g-at/L respectively, which were exceeding second grade of seawater quality standard. The nitrogen ratio to the phosphorus was lower than 1. Therefore, nitrogen was playing an important role in phytoplankton growth as limiting factor in study area. Mean values of eutrophication index were exceeding 1, which was the eutrophication criteria. Especially Mankyung and Dongjin estuary were shown over 10 as eutrophication index. Therefore, Saemankeum area could be evaluated to possibility area for eutrophication. Released rate for ammonia nitrogen and phosphate phosphorus from sediments were 62.92 ${\mu}g-at/m^3/hr$ and 6.71 ${\mu}g-at/m^3/hr$, respectively.