• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.479-484
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• 1999

Rice crop has relatively short growing season during the summer in Korea and, therefore, it is often difficult to acquire cloud-free imagery on time. This study was attempt to define the temporal characteristics of radar backscattering observed from satellite L-band SAR data on different growing stages of rice crop. Six scenes of multi-temporal JERS SAR data were obtained from the transplanting season to the harvesting month of October. Six layers of multi-temporal SAR data were registered on a common geographic coordinate system. Using topographic maps, field collected data, and Landsat TM data, several sample rice fields were delineated from the imagery and their relative radar backscatters were calculated by using a set of reference targets. The temporal pattern of radar backscattering was very distinctive by the growing stage of rice crop. It was also separable between two types of rice fields having different cultivation practices. Considering the temporal characteristics of radar backscattering observed from the study, it is obvious that a certain date of the growing season can be more effective to delineate the exact area of the cultivated rice crop field.

• 한국초지조사료학회지
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• 제10권2호
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• pp.115-120
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• 1990

A series of experiments were carried out for two successive years to investigate the productivity of forage turnip in mid-northern area of Korea. Fresh matter and dry matter yields of 6 foreign cultivars (Purple Top Strap Leaved, Purple Top White Globed, Seven Top, Shogoin, White Egg and Amber Globe) seeded either in early spring or in autumn after harvesting forage corn were evaluated with different seeding date and harvesting date as well as with different level of fertilization. The results obtained are summarized as follows: 1. The earlier the seeding date in spring (Mar. 29, Apr. 12, Apr. 16) was, the higher was the yield of fresh matter and dry matter as the plant growth ceased after mid June, when the temperature began to rise. 2. In spite of its high DM yield, the Japanese cultivar, Shogoin, showed poor forage quality for summer feeding due to its earlier bolting in harvesting season. 3. Of the 6 cultivars Purple Top White Globed showed highest DM yield (800 kg/ 10a) in mid area including SEOUL irrespective of planting season. 4. Although the turnips showed mostly positive yield responses to fertization, the differences were not great especially above the level of$N-P_2O_5-K_2O$: 5-3-4 kg/lOa. 5. IN TAEGWALLYONG, a northern area of Korea, the average fresh matter yield of the six cultivars tested amounted to 3,500 kg/lOa when drilled on June 30 and harvested on Aug. 30, although bulb formation during the summer was relatively poor. 6. Concluded, forage turnip is regarded to be a suitable catch-crop which has the potential to maintain and increase the total forage production in mid-northern area of Korea. The intercropping is recommendable especially for autumn planting well past the time forage corn has been harvested.

• 원예과학기술지
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• 제18권3호
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• pp.395-398
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• 2000

본 연구는 떫은감 "청도반시"를 조기착색과는 9월 21일, 적숙과는 10월 11일에 수확하여 수확시기에 따른 연화정도를 조사하고, 연시제조의 적정온도를 설정하고자 10, 15, $20^{\circ}C$에서의 품질변화를 조사하였다. 경도는 처리온도 15, $20^{\circ}C$에서 처리 2일만에 전체 경도 감소량에 70% 정도 감소되었으며, 6일 이후에는 경도의 감소가 완만하게 되었다. 처리온도 $10^{\circ}C$는 다른 처리온도에 비하여 높은 경도를 나타내어 연시제조에는 효과가 없었다. 가용성탄닌은 수확시기에 관계없이 15, $20^{\circ}C$의 처리구에서 6일째에 급격히 감소하였으나, 무처리구는 가용성탄닌이 약간 감소되었다. 조기수확과의 Hunter 'L', 'b' value는 모든 처리온도에서 2일째까지 증가한 후 감소하였고, 적숙과는 초기부터 감소하기 시작하여 8일째부터는 비교적 일정한 경향을 보였다.

• Agricultural and Biosystems Engineering
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• 제5권2호
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• pp.40-44
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• 2004

This study was conducted to solve the problem of spinach harvesting done by manpower at the outdoor field during the cold winter season. Prototype spinach harvester was designed to dig, pick-up, and collect in a continuous operation for harvesting outdoor field-planted crawling type spinach. In the field test, two types of blades (Type A : angle of $150^{\circ}$, Type B : straight) were used for measuring the cutting loads of spinach and chain conveyor with lugs was used for picking up the root cut spinach. Prototype's vibrating blade reduced the digging power of the fixed blade by $46\%$. The loss was also very little ($0.7\%$) with a digging depth of 4 cm, an oscillation frequency of 748 rpm, and an oscillation distance of 33 mm. The working performance of the prototype spinach harvester was 38 hour/ha resulting to $96\%$ labor cost reduction compared to the conventional harvesting.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2018년도 학술발표회
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• pp.485-485
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• 2018

Rainwater harvesting system (RWH) can provide a relief for the household and farmers especially in areas with intense water scarcity during the long lull of rainy season. However, much attention has not been given to this alternative water source in Nigeria. This paper estimates the per capita water demand for 1,950 inhabitants and rainwater potential in Ojonbodu Estate, Oyo State, Nigeria, using data from detailed questionnaires, water consumption calculator software, and 20-year rainfall data. The potential rainwater estimation was based on amount of precipitation, size of catchment and runoff coefficient. Consequently, using estimated values of $39420m^3$ and $6.5114{\times}10^7m^3$ for per capita consumption and potential rainwater respectively, the rainwater harvesting system was designed for rainwater collection, and storage. The harvested rainwater was $450, 000m^3$ with collection efficiency of 69.16 %, which exceeded the household water consumption requirement. Thus, the harvested rainwater was able to meet the estimated water demand of the Ojonbodu Estate households during the period of water scarcity.

• 한국식품과학회지
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• 제16권1호
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• pp.59-65
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• 1984

토마토 과실의 숙성방법과 수확시기가 비타민 조성에 미치는 영향을 조사하기 위하여, 선정된 5개의 토마토 품종을 대상으로 1978년과 1979년에 걸쳐 연구한 결과를 요약하면 다음과 같다. 토마토 중의 아스콜빈산 함량은 breaker ripened tomatoes가 vine ripened tomatoes보다 유의성 있게 높았으며, 이 결과는 2 년동안 일관성 있게 나타났다. 수확시기에 따른 토마토 중의 아스콜빈산 함량은 계절 초기에 수확된 토마토에서 현저히 낮았고, 그 이후에 수확된 것들 간에는 유의성 있는 차이가 없었다. 토마토 중의 캐로틴 함량은 vine ripened tomatoes와 breaker ripened tomatoes 간에 유의성 있는 차이가 없었으며, 이 결과는 2 년간 일관성있게 나타났다. 늦은 계절에 수확한 토마토는 그보다 일찍 수확한 것보다 훨씬 많은 캐로틴을 함유하였다. 토마토중의 지아민과 리보후라빈 함량은, 1978년에는 vine ripened tomatoes가 breaker ripened tomatoes 보다 유의성 있게 높았으나 1979년에서 유의성있는 차이가 없는 것으로 나타나, 앞으로 더욱 연구가 필요하다고 여겨진다. vine ripened tomatoes 중의 지아민과 리보후라빈 함량은 계절이 진전됨에 따라 감소하는 경향이 있었으며, 계절초기에 수확한 토마토가 그 이후에 수확된 것들보다 유의성있게 높은 지아민 및 리보후라빈 함량을 나타내었다.

• 생물환경조절학회지
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• 제16권4호
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• pp.338-343
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• 2007

참외 재배시설의 광 환경 개선을 위하여 필름두께, 자외선 차단율, 적외선 흡수율이 다른 polyolefin계 필름 3종(J-1, J-2, J-3), polyethylene계 필름(K-1, K-2 농가에서 관행으로 사용하는 폴리에틸렌 필름(K-3)을 대조구로 시험한 결과, 보온성은 K-3처리구에 비하여 J-2 처리구에서 가장 높았고 J-3, J-1 순이었다. 초기생육, 암꽃 개화 및 수확소요일수는 재배지역과 품종에 따라 다소 차이는 있으나 K-3 처리구에 비하여 J-1, J-2, J-3 처리구에서 초기생육이 촉진되었고 첫 수확소요 일수도 10일 이상 단축되었다. 10a당 상품수량은 K-3 처리구의 991kg에 비하여 J-1, J-2, J-3, K-1 및 K-2 처리구에서 각각 21%, 37%, 24%, 13%, 4%증가하였다. 특히 J-1, J-2, J-3 및 K-1 처리구는 초기, 중기, 후기의 수량 비율이 각각 50%, 40%, 10%로 초기 및 중기의 수량이 많았다. 이상의 결과로 볼 때 보온성이 강화된 polyolefin계 필름은 저온기 참외 시설재배 시 생육을 촉진시켜 수확소요 일수를 단축시키고 조기수량을 증가시키는 것으로 생각된다.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2006년도 한국약용작물학회 공동춘계학술발표회
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• pp.116-117
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• 2006

• Journal of Nutrition and Health
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• 제28권9호
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• pp.893-903
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• 1995

This study was attempted to estimate seasonal variations of physical activity level, energy balance & body composition of 38 rural women, aged 31 to 67yrs in three seasons ; farming season(June), harvesting season(October), nonfarming season(February) Energy intake, energy expenditure and body composition were assessed using questionnaire, daily activity diary & bioelectrical impedance. The type of activities & the period of the spent on each activity were changed significantly with the seasons. Daily mean duration(min) of farming activity was significantly higher in June & October than in February(p<0.005) & daily mean energy expenditure for farming activity was significantly high in June & low inFebruary (p<0.005). Daily mean energy expenditure was 2892.9㎉ in June, 2487.4㎉ in October and 2130.9㎉ in February and changed significantly in three seasons(p<0.005). Daily mean energy intake was significantly higher in June(=1950.3㎉) & October (=1946.9㎉) than in February(=1423.3㎉)(p<0.005). According to RDA for koreans, the level of physical activity fell into exceptional activity category in June, heavy in October, moderate in February. Mean energy balance was negative in all seasons ; 0.682 in June, 0.812 in October and 0.698 in February. In three seasons mean body weight, mean obesity rate and mean body mass index(BMI) were not changed significantly. But there were significant seasonal variations in body fat(%) & lean body mass(LBM)(%). The mean percentage of body fat(%) was within normal range(24.44-24.79%) & the mean percentage of lean body mass(LBM)(%) representing long term physical activity was significantly higher in June(75.56%) & October(75.21%) & October (75.21%) than in February(72.75%)(p<0.05).

• 한국수산과학회지
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• 제49권3호
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• pp.337-342
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• 2016

Sea cucumbers have been an important part of human diets throughout history; demand is increasing every year, making the species a target for coastal resource development. New harvesting technologies have been developed in response to demand, including nursery production and insemination aquaculture, but such methods produce relatively few individuals and productivity per unit area is very small. For example, captures are prohibited during July and August due to the breeding season, and sea cucumbers aestivate during the hot season and hibernate during the cold season, all factors that limit natural-environment production in Korea. Problems with slow growth of sea cucumbers have been encountered in previous rearing experiments. To assess the importance of feeding ecology on sea cucumber growth, we conducted pond-bottom and lantern-net culture experiments. Results showed that sea cucumbers in bottom cultures grew from 3.06 to 102.59 g, but those in lantern cultures only grew from 25.60 to 28.03 g.