• Korean Journal of Ecology and Environment
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• v.33 no.4 s.92
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• pp.395-404
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• 2000

The gonadosomatic index (GSI), hepatosomatic Index (HSI), egg size distribution, gonad development and reproductive characteristics of venus fish, Aphyocypris chinensis, were examined during March 1997- March 1998 in agricultural waterways of the Sedo-myun, Puyo county, Chungnam Province, Korea. Annual reproductive cycle was classified into the following five successive phases by monthly changes in GSI and the characteristics of ovary: quiescent phase (January- February), secondary growing and mature phase (March-May), ripe and spawning phase (June-July), degenerating and resting phase (August-September) and primary growing phase (October-December). The hepatosomatic index (HSI) showed clear seasonal pattern with two separate peaks. However, it exhibited a negative correlation to changes of GSI values. The regression analysis suggested that fecundity showed a strong positive linear relationship ($r^2\;=\;0.91$, n = 34) with body weight. The sex ratio of female to male was 1.4 : 1 in the natural population during the study. The minimum reproductive size of female and male venus fish was 38 mm and 33 mm in fork length, respectively.

• Korean Journal of Ecology and Environment
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• v.35 no.3 s.99
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• pp.187-197
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• 2002

To analyze the structure of phytoplankton community of the Asan Reservoir in Korea, samples were collected 6 times from March to November in 1997. A total of 204 phytoplanklon species were identified from the samples of 19 stations. Green algae dominated the phytoplankton community, accounting for 51% of species number, followed by diatoms (29%), cyanobacteria (12%), dinoflagellates (2%) ,euglenoids (3%) and other flagellates (3%). Standing stocks of phytoplankton were very high in the range of 741-613,066 cells/ml, with the highest standing stock in July. Water Booms seemed to occur in the Asan Reservoir regardless of seasons, with water bloom-causing species being Micractium pusillum, Stephanodiscus, hantzschii, Dictyospharium pulchellum, cryptomonad(> 20 ${\mu}$m), Microcystis aeruginosa, Oscillatoria tenuis, Oscillatoria sp., Aphanocapsa sp. Euglena sp., Volvox aureus. In the summer, cyanobacteria dominated algal bloom. Species diversity of phytoplankton community in the reservoir was in the range of 0.13 ${\sim}$ 3.20, and showed much difference temporally and spatially. The cluster analysis identified two different regions of upstream area and downstream area for the Asan Reservoir.

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.244-244
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• 2017

2015년 국토교통부(영산강홍수통제소)에서는 물 순환 과정의 규명에 이용되는 증발산량 자료의 제공을 목적으로 무안지역에 플럭스 타워를 설치하여 운영하고 있다. 무안 플럭스 타워는 에디공분산 방법을 이용하여 증발산량 자료를 관측하는 방식으로, 본 연구에서는 무안 관측소에서 생산된 자료의 정상성 검토를 위하여 2015년과 2016년 운영 결과를 비교 분석하였다. 무안관측소의 2015년도 연 증발산량은 615.8mm(연 강수량 대비 56.0%)로 나타났으며, 2016년도 연 증발산량은 721.5mm(연 강수량 대비 49.5%)로 나타났다. 연 증발산량은 전년대비 약 100mm 증가하는 양상을 보였으며, 강수량 대비 비율은 6.5% 감소하는 것으로 분석되었다. 2015년 대비 2016년 무강우일수는 6일 증가 하였으나, 실제 순복사에너지는 $18,320w/m^2$ 감소하는 것으로 나타났다. 실제 이 차이는 2개년 평균치의 약 2% 내외 수준으로 예년대비 순복사에너지는 거의 비슷한 것으로 분석되었다. 복합적 요인에 의해 정량적 크기가 결정되는 증발산량의 특성상 추가적인 분석이 필요하나, 2016년의 경우 전년대비 증가한 강우의 영향이 지배적이였던 것으로 검토되었다(2015강수량 : 1,099mm, 2016강수량 : 1,457mm). 월별 증발산량 비교 분석결과 정량적인 차이는 존재했으나 전년과 마찬가지로 1월부터 증발산량이 증가하여 8월에 최대 증발산량을 보인 후 감소하는 형태를 나타냈으며, 5월과 6월이 증발산량이 역전되는 양상도 동일하게 나타났다. 이는 남부지역 모내기 시기인 5월경 관개용수(Irrigation water) 공급에 따른 유입원의 증가와 함께 5월 대비 6월(장마철) 흐린날(Cloudy condition) 증가에 따른 상대적인 순복사에너지(5월: 약20만$w/m^2$, 6월: 약17만$w/m^2$)의 감소가 주 원인이였던 것으로 검토되었다. 이를 통해 볼 때 무안 증발산량 자료는 추가적인 경년변화 연구가 필요하겠으나, 국가통계자료로써 유의미한 자료로 판단되며, 향후 증발산량에 대한 지속적인 연구 및 관측망의 확대를 통해 국가 이수관련 정책수립에 유용한 자료로 이용 될 수 있을것으로 판단된다.

• Korean Journal of Plant Resources
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• v.22 no.2
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• pp.123-127
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• 2009

This study was carried out to investigate the classification and the growing characteristics of biennial weed species in a newly formed transplanting lawn grass land. Measuring size in the experimental plot was $1{\times}1m$ in the 9 different locations, and experimental design was randomized complete plot with 3 replications. The results obtained are summarized as follows. 1) Weed species in a newly formed lawn field are consisted of 29.4% of Cruciferae, 29.4% of Compositae, 23.5% of Caryophyllaceae, 11.8% of Gramineae, and 5.9% of Labiatae family 2) Emerging percentage of weed species are consisted of 47.1% on October, 41.2% on November, 5.9% on both September and December, respectively. 3) Distribution rate about flowering time of weed species was in order of 58.5% on May, 23.5% on April, 11.8% on March, and 5.9% on June. 4) Weed species were grouped according to the plant height. It was observed that below 20cm, 20-40cm, 40-60cm and above 60cm of plant height were 23.5%, 47.1%, 17.6% and 11.8%, respectively.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.37 no.4
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• pp.372-376
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• 1992

This experiment was conducted to determine hay making time on the drying period, hay moisture content, hay loss content, yield and forage quality of Italian ryegrass in paddy field. Plant height increased rapidly from middle of April, and leaf weight rate were 55.6% at April 20 and 18.9% at May 30. Moisture content and loss content of hay were 17.1-20.5% and 10.2-15.0%, respectively, at drying for 4 days from May 10 to May 30. As the growth stage later, crude protein, fat and ash contents reduced, but crude fiber and NFE contents increased. Dry matter and TDN yield at the cutting of May 20 and May 30 increased to 17-18% and 5-11%, respectively, than those of April 20＋May 30.

• The Korean Journal of Food And Nutrition
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• v.16 no.3
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• pp.209-217
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• 2003

The composition of muscle proteins and free amino acids in the mudskipper (hibernant fish) were investigated before and after hibernation (maturity period: August, hibernation period: November thru. April). It was found that crude proteins were 17.6% in August, 17.5% in November and 16.9% in April, while among the muscle proteins, sarcoplasmic proteins were constituted up to 19.2～20.4%, 58.8～61.3% for myofibrilla proteins, 11.2～13.2% for intracellular proteins and 7.5～8.3% for stroma proteins. Composition changes of the muscle proteins were hardly noted until November but during the hibernation(from Nov. to Apr.) the amount of the sarcoplasmic proteins and the myofibrillar proteins decreased pronouncedly. As for the sarcoplasmic proteins, 14 subunits were found and among them, the amount of 30 kDa and 46 kDa subunits were found to increase slightly in April compared with those in November, while the amount of 35 kDa and 65 kDa subunits were decreased slightly. As for the myofibrilla proteins, 13 subunits were found and detectable changes in their composition were not observed until November but in April the amount of myosin heavy chain was increased by 3%, while the amount of actin decreased by 3% when those are compared with the results in November. The composition of amino acids in the muscle proteins was hardly changed during the observation period. But there were considerable changes of composition of free amino acids. Glycine and alanine were found to be the major free amino acids. The most striking feature was the changes in the glycine and arginine content: the former, which is a dominant free amino acid, was increased by two-fold in April compared with that in August and the latter was increased by two-fold in November and by four-fold in April. It was also found that the amount of essential amino acids (i.e., lysine and histidine) and others (alanine, glutamic acid, serine, aspartic acid and valine) increased significantly during the hibernation period.

• Journal of the Korean Society of International Agriculture
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• v.23 no.5
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• pp.520-530
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• 2011

This study was carried out to evaluate the possibility of rice double cropping in Korea by assessing the growth and yield performance of rice cultivars transplanted at the extremely-early date. When the transplanted rice seedling was exposed to low temperature below 0℃, the survival rate decreased drastically. However, short exposure to below 0℃ one or two times did not damage transplanted rice seedling so severely. Thus, the earliest transplanting in spring would be possible when minimum temperature rises above 0℃. Compared with the conventional seedling nursery tray (CSNT), seedling rearing with the potted nursery tray was more effective for increasing leaf age and seedling dry weight during nursery period. In the first rice cropping, rice cultivation with seedlings reared in PSNT showed shorter growth duration and cumulative temperature from transplanting to heading than that with seedlings reared in CSNT. The earliest heading date on July 4 in Jinbuolbyeo was earlier by two to three days than that of Dunaebyeo. If rice has not exposed to cold damage, the earliest heading date of Jinbujolbyeo can advance to June 30 or July 1. In this case, rice harvest would be possible on August 5, enabling the rice transplanting of the second rice cropping before August 10. At transplanting time with low temperature damage rice yield were less than 400 kg/10a while rice yield exceeded 400 kg/10a at transplanting time without low temperature damage.

• Venture DIGEST
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• s.47
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• pp.8-9
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• 2004

지난 2월 24일과 3월 13일은 우리나라 여성 공학계에 뜻깊은 일이 있었던 날이다. 2월 24일은 이공계 각 산업분야에서 성공을 거둔 여성 공학인들의 이야기를 엮은 《세상을 바꾸는 여성 엔지니어》의 출판 기념회, 3월 13일에는 그 여세를 몰아‘한국여성공학기술인협회’가 정식으로 발족한 날이다. 이공계 침체 현상을 역전시키고, 그 미래를 밝게 틔워줄 이런 반가운 움직임의 중심에 퓨어셀파워 신미남 대표가 있다. 포근한 인상과 달리 이공계에 대한 자부심과 미래 비전에 대해 자분자분 풀어내는 표정에서 단단한 리더십과 도전정신이 풍겨 나왔다.

• Korean Journal of Environmental Agriculture
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• v.33 no.4
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• pp.364-371
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• 2014

BACKGROUND: To evaluate the impact of rapid temperature change at spring and the early summer seasons in climate change, we have investigated the physiological response and yield of onion in a greenhouse with thermostat control system. METHODS AND RESULTS: Seedlings of onion(cv. Sunshine) were planted on October 30, 2012 and harvested on May 30, 2013. The used treatments(March-April-May) for a rapid temperature change were T0(control): $6.0-10.4-17.2^{\circ}C$, T1: $6.0-5.4(-5)-17.2^{\circ}C$, T2: $6.0-10.4-22.2(+5)^{\circ}C$ and T3: $6.0-5.4(-5)-22.2(+5)^{\circ}C$. Total yields of bulb within the temperature change as high temperature treatment T2 and control treatment T0 were increased significantly(p<0.05), as compared to the low temperature treatment T1. Low temperature conditions significantly (p<0.05) reduced plant height, SPAD reading, crude protein and fiber etc., as compared to the TO and T2. CONCLUSION: The rapid temperature changes were highly affected by low temperature than high temperature. These results suggest that rapid climate change of future could need systematic standard model for physiological characteristics and yields of onion.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.1 no.6
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• pp.54-60
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• 1980

7월과 8월의 이상기온으로 복숭아심식나방(桃姬心　忠)이 예년보다 한달이나 늦게 발생 전국 과수원에 피해를 주고 있는 것으로 나타났다. 예년같으면 8월 중에 나타나던 2 화기가 올해는 9월에 만연될 것으로 보여 과수농가에서는 예방과 방제에 각별히 유의해야 될 것 같다.