• Journal of the Korean Wood Science and Technology
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• 제33권3호통권131호
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• pp.53-63
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• 2005

본 연구는 바다목장사업 소재로서 방부처리 목재의 사용 가능성에 대한 기초자료를 얻고자 실시하였다. CCA, CCFZ, ACQ 처리재 내 포함된 유해 중금속의 해수에 대한 용탈 안전성을 평가하기 위해 각각 2% 및 3% 방부제 수용액으로 처리한 목재를 증류수, 자연해수 및 인공적으로 염도를 조절한 인공해수에 41일간 폭로하여 기간 별 각 성분의 용탈량을 측정하였다. 바닷물에서 CCA 처리재의 구리 및 크롬의 용탈은 거의 일어나지 않았으며, 다소 많은 비소의 용탈이 있었으나 증류수에서의 용탈에 비해 적은 양을 나타내었다. CCFZ는 증류수에서 크롬과 아연의 용탈량이 매우 높았으나 바닷물에서는 훨씬 적은 용탈량을 나타내었다. 방부제 흡수량 및 인공해수의 염분 농도에 따른 용탈량에는 큰 차이가 없었다. ACQ 처리재는 CCA 및 CCFZ 처리재에 비해 많은 구리 용탈을 나타내었으며 용탈 매체에 따른 차이는 나타나지 않았다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.696-699
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• 2004

A side scan sonar system uses the towfish installed sonars, It is an equipment that search images of the bottom surface of the sea in real time. It is a typical equipment that is related to a sea investigation such as a geological survey, seabed communication cable and power line cable placing repair investigation, fish breeding ground investigation, sea purification, relic and mineral investigation, and mine and submarine search. It used to fined objects and investigate on the seabed surface. But, recently, it is used to sea purification and geological survey that require information of the correct surface of the seabed. So, it needs various filtering technique and image processing techniques development to acquire high resolution image. therefore, this research develops a side scan sonar using multi-beam sensors that supply various information with the fast scan speed and correct high resolution that is not a simple underwater investigation equipment.

• 대한전기학회논문지:시스템및제어부문D
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• 제54권10호
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• pp.581-586
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• 2005

The multi-beam side scan sonar system uses the towfish installed sonars, it is an equipment that search images of the bottom surface of the sea in real time. It is a typical equipment that is related to a sea investigation such as a geological survey, seabed communication cable and power line cable placing repair investigation, fish breeding ground investigation, sea purification, relic and mineral investigation, and mine and submarine search. Recently, it is used to sea purification and geological survey that require information of the correct surface of the seabed. Therefore, this research develops multi-beam sensors for a side scan sonar that supply various information with the fast scan speed and correct high resolution that is not a simple underwater investigation equipment.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2006년도 전기학술대회논문집
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• pp.317-318
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• 2006

The towfish oi a side scan sonar is an equipment that search images of the bottom surface of the sea in real time. It is a typical equipment that is related to a sea investigation such as a geological survey, seabed communication cable and power line cable placing repair investigation, fish breeding ground investigation, sea purification, relic and mineral investigation, and mine and submarine search. It used to find objects and Investigate on the seabed surface. But, recently, it is used to sea purification and geological survey that require information of the correct surface of the seabed. So, it needs various filtering technique and image processing techniques development to acquire high resolution image. Therefore, this research develops a side scan sonar using multi-beam sensors that supply various information with the fast scan speed and correct high resolution that is not a simple underwater investigation equipment.

• The Korean Journal of Ecology
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• 제8권2호
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• pp.119-126
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• 1985

One nest of the Common Kingfisher Alcedo atthis bengalensis Gmelin breeding in the area of Mt. Bangu, Mugye-ri, Jangye-ri, Jangyu-myon, Gimhae-gun, Gyongnam province, was observed for 43 days from July 18 to August 29, 1984. The nest was found at a height of 71cm in a steep mountain side. It was tunnel-shaped, with a size of 53cm(length), 5.5*6.4cm (the diameter of entrance) and 16.1*10.5cm (the diameter of incubation seat). The cluth size was 5 eggs. The eggs were white in color, the average size of 5 eggs being 20mm (length)*17.9mm(width). The incubation period was 18 days, the parent birds stayed in the nest at on average of 494 minutes and the rate of incubation was 82.20%. The incubation time increased gradually. The nesting period of 3 chicks was 25 days, and the average feeding frequency was 5, 50 times per day with the highest frequency of 10 times on the 14th days after hatching. The time and frequency of attendance gradually decreased as their chicks grew up. Total increase length in body was; body length 45.35longrightarrow147.80mm, wing 6.95longrightarrow63.40mm, bill 1.73longrightarrow29.36mm and body weight 2.93longrightarrow41.00gr. The prey for the 3 chicks of the nest was entirely fish. The main food item was the fry of Gobiobotidae. The home range of the nest was 0.43ha. and the territory size was 0.05ha. Their feeding ground were outside of their territory.

• 한국수산과학회지
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• 제46권6호
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• pp.835-842
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• 2013

Flathead flounder Hippoglossoides dubius is a commercially important fish in the coastal waters of Gangwon Province, which is its spawning ground and breeding habitat. A total of 1,669 gonads were sampled monthly from February 2011 to May 2013 to investigate ecological characteristics, such as variations in maturation and spawning by gonad index, visual maturity stage, histological observations and oocyte diameter. Males were numerically dominant over females in the fishing grounds year round. The spawning season was from January to April, and the peak was from February to March. Oocyte number as a measure of fecundity was between 27,372 and 915,209 eggs with a length range of 26.0-48.7 cm TL, while the largest oocyte grew to 0.9-1.4mm in egg diameter during its spawning season. The relationship between fecundity and total length was $F=0.0016TL^{5.2539}$. The smallest mature lengths of the females and males were 28.4 and 22.6 cm respectively, and the 50% mature lengths of females and males were 32.9, 26.9 cm respectively.

• 한국어류학회지
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• 제19권4호
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• pp.306-317
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• 2007

전라북도 곰소만에 위치한 선운리 조간대에서 채집된 2007년 4월부터 2007년 10월까지 말뚝망둥어 Periophthalmus modestus Cantor의 산란기를 파악하기 위하여 생식소 발달과 생식주기를 조사하였다. 난소는 수많은 난소소엽으로 이루어진 한 쌍의 낭상구조로 이루어져 있고, 정소는 1쌍의 엽상형 구조로 이루어져 있다. 말뚝망둥어의 생식소 발달과 성숙 및 배정은 지온증가와 장일장의 환경요인에 의해 조절되고 있다. 암컷과 수컷에서, 생식소중량지수(GSI)는 지온이 증가되기 시작하는 늦은 4월부터 증가되기 시작하였고, 6월 하순(고지온-장일장)인 하계에 최대에 도달하였다. 그리고 7월부터 8월까지 점차 감소되었다가 9월부터 증가하였다. 간중량지수 값(HSI)은 암수 모두 4월부터 점차 감소되었으며 암컷은 7월(성숙기)에 수컷은 6월에 최소에 이르렀다. 이후 8월(배정 및 회복기)부터 점차 증가되기 시작하였다. 암컷에서, GSI와 HSI 사이에는 역상관 관계를 나타내었다. 비만도지수는 4월(초기성장기)부터 점차 증가되기 시작하여, 6월(성숙기)에 최대에 도달한 다음 7~8월에 점진적으로 감소되었다. 산란기의 난경빈도 분포에 의해 말뚝망둥어는 산란기간 중 2회 또는 그 이상 산란하는 비동기발달형의 다회산란종으로서, 총 포란수는 체장에 비례하여 증가되었다. 군성숙도에 이르는 비율은 체장 5.1~5.5 cm인 암 수 개체들에서 각각 56.5%와 60.0% (평균 58.3 %)로 나타나, 이 계급 구간에서 생물학적인 최소 성숙 크기를 보여주었다. 이 종의 생식주기는 암컷의 경우 초기 성장기(4~5월), 후기 성장기(4~5월), 성숙기(5~6월), 완숙기 및 산란기(6~8월), 회복 및 휴지기(8~3월)의 5단계로 수컷의 경우는 성장기(4~5월), 성숙기(5~6월), 완숙 및 배정기(6~8월), 회복 및 휴지기(8~10월)의 4단계로 구분되었다. 암수의 성비를 조사한 결과 암 수의 성비는 1:1로 유의한 차를 보이지 않았다(${\chi}^2=0.65$, p>0.05).