• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1994.11a
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• pp.94-95
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• 1994

과채류의 저장성향상을 위해서는 알맞은 품종의 선택도 중요하지만 재배기간중에 적절한 시비와 관수, 시설내의 온도, 그리고 광조건 등도 잘 관리해야 한다. 본 연구는 오이 재배시 재배요인으로 중요한 토양수분의 함량이 오이의 저장성과, 아울러 몇 가지 품질에 미치는 영향을 구명하고자 실시하였다. (중략)

• Journal of Wetlands Research
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• v.20 no.1
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• pp.27-34
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• 2018

Reproductive phenology and physiological responses of Epilobium hirsutum L. to moisture content and nutrient content of soil were analysed in order to obtain basic data for effective conservation and restoration. Epilobium hirsutum L. is a perennial plant. But Epilobium hirsutum L. grew reproductively in all moisture and nutrient gradients. Flower bud, flowers and peduncle were respectively ripened in earlier under highest moisture condition and highest nutrient condition. And, number of flowers and peduncle were more quickly increased under highest moisture condition and highest nutrient condition. Chlorophyll content was high under highest moisture condition and higher middle moisture condition. However, we found no significant difference of chlorophyll content regard to nutrient gradients. There was no difference in minimum chlorophyll fluorescence among all moisture and nutrient gradients. The photochemical efficiency values of PS II were 0.75 in all moisture gradients, and it was 0.78 in highest nutrient gradient. The chlorophyll content of Epilobium hirsutum L. increased as the moisture content increased, and the Fv/Fm value increased as the organic matter increased. Our results showed that high moisture and nutrient content of soil advance their breeding season and promote reproductive growth. It might be important basic informations for the maintenance of population and the management of habitat of Epilobium hirsutum L. an endangered plant species.

• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.5
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• pp.68-75
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• 2021

This study performed simulating water absorption in various pre-cracked concretes. 2D-Finite Element Analysis (2D-FEA) model was developed based on experimental results on the amount of absorbed water in concrete with the exposure time. Results from the 2D-FEA showed that both crack width and crack depth strongly affect the amount of absorbed water in cracked concrete. In addition, water absorption rate is introduced and a predictive equation is suggested to estimate the rate in order to quantify the amount of absorbed water in cracked concrete. It was confirmed that water absorption in concrete having less than 150 mm crack depth was dominated as a main transport factor regardless of crack width. Therefore, considering that steel corrosion caused by chlorides dissolved in water mainly occurs in reinforced concrete structures, it is necessary that crack depth as well as crack width should be investigated in reinforced concrete structures at the time of field-inspection.

• Journal of the Korean association of regional geographers
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• v.7 no.3
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• pp.44-58
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• 2001

The purpose of this study is to investigate the potential water condition of Honam region according to water budget analysis. For this purpose, the eight regions (Suncheon, Gwangju, Jhangheung, Damyang, Mokpo, Yosu, Huksando, Namwon) are selected as study area. The result is as follows. (1) The water surplus indicating the potential water condition is ordered as Yosu, Sunchon, Changhung, Namwon, Damyang, Huksando, Kwangju, Mokpo. So the potential water condition of Kwangju and Mokpo is worst among study regions. (2) The high water surplus region is corresponded to high precipitation and low actual evapotranspiration legions. (3) The potential water condition is to agree with several facts about the water resource condition of Honam region. For example, large scale dam of Honam region has been constructed for Kwangju and Mokpo city. This fact indicates that the potential water condition calculated by water budget analysis is corresponded to actual water resource condition. (4) Consequently, the water budget analysis is effective method for investigating the actual water condition and establishing the water resource management of specific regions.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.2
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• pp.121-127
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• 1985

This study was designed to gain practical data on the use of soil conditioners for more efficient water managements and to establish the optimum levels of structural properties for soil conditioning. A sandy loam and a silt loam soil were each treated with two different soil conditioners, hydrophobic Bitumen or hydrophilic Uresol. The perspex tube 34 cm long were packed homogeneously with air dried soil up to 2 cm below the top, then covered over 2 cm of treated or untreated aggregates. The infiltration rate into the soil columns was measured under simulated rainfall condition. The evaporation study was carried out in the wind tunnel, and the changes of soil moisture distribution of the columns following and during the evaporation were determined by a gamma ray scanner. The infiltration rate of water into the soil column was increased to 18.7-50.8% by the Uresol treatment but it was decreased to less than 25% of control by the Bitumen treatment. Evaporation was decreased to 22.0-68.1% by the Bitumen treatment and to 38.7-68.4% by the Uresol treatment. The water use efficiency of Uresol treated column was increased to more than twice as much as that of untreated soil. Aggregate stability and wetting angle were related to water infiltration and evaporation. A positive and highly significant logarismic relationship was found between the infiltration rate and stability index-wetting angle, evaporation rate and instability index-wetting angle. It was considered that the structural stability is more important than wetting angle. This is true because the structural stability is always positively correlated to water saving, however wettability is positively correlated to the infiltration, and negatively correlated to water saving during the evaporation.

• Korean Journal of Soil Science and Fertilizer
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• v.39 no.6
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• pp.329-333
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• 2006

Most of volcanic ash soils in South Korea are distributed in Jeju province which is an island placed on southern part of Korea and has steep slope mountain area. There are many soils containing high contents of organic matter (OM) derived from volcanic ash in Jejudo, also. Therefore, irrigation and drainage in volcanic ash soil different with general soil which has low OM content have to be applied with another management way, but studies searching appropriate methods for them are set on insufficient situation because the area of volcanic ash soil in South Korea is only 1.3% (130,000ha). This study was conducted for analysis of soil water content and irrigation quantity appropriate for crops cultivated in volcanic ash soil with high OM content. Although soils with different soil color have the same soil texture, soil water characteristics curve by soil color showed the difference of water retention capability by OM content. But, this characteristics classified with soil color could be unified by scaling technique with similitude analysis method which get dimensionless water content using a present water content, a residual water content and saturated water content (or water content at 10kPa). A relation of gravimetric soil water content (GSWC) and dimensionless water content by the results showed a form of power function. The dimensionless water content (DWC) express a relative saturation degree of present water content. This was also expressed by van Genuchten model which describe the relation between relative saturation degrees and matric potentials. These results on soil water characteristics curve (SWCC) of volcanic ash soil will be the basic of irrigation plan in area having high organic contents into soil.

• Proceedings of the KAIS Fall Conference
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• 2010.11b
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• pp.882-884
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• 2010

본 연구는 피부미용전문가에 의한 관리 후, 홈케어 유무에 따른 건조피부의 개선 효과를 알아보고자 하였다. 건조피부로 평가된 10명을 대상으로, 한족 팔에는 마사지와 홈케어를 적용하고, 다른 쪽 팔에는 단지 마사지만을 적용하였다. 마사지는 호호바오일에 라벤더정유를 혼합하여, 10분간의 마사지를 주 2회로 총 4주 동안 실시하였고, 홈케어로는 마사지에서 사용한 시료를 집에서 매일 바르도록 하였다. 실험 결과 마사지와 홈케어를 적용한 그룹이 마사지만을 한 그룹보다 유분과 수분의 함유량이 증가하였다. 특히, 마사지와 홈케어를 한 그룹에서 마사지의 횟수가 증가 될수록 피부에서의 유 수분은 증가하는 것을 알 수 있었다. 따라서 전문가에 의한 관리효과를 유지하고, 더 효과적으로 건조증상를 개선시키기 위해서는 무엇보다도 홈케어의 중요성이 강조되어야 한다.

• Corrugated packaging logistics
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• s.93
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• pp.59-64
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• 2010

골판지조합은 지난 7월13일 농산물품질관리원장에게 "농산물포장용 골판지상자 중량 허용오차 기준 제안"을 하였다. 이번 제안은 농림수산식품부 산하 농산물품질관리원원에서 운영하고 있는 농산물포장 표준규격에서 중량 표시규격은 있으나, 이에 대한 허용오차에 대한 명확한 기준이 없어 실제 거래관계에서 혼선이 야기되고 있으며, 골판지포장은 수분함량 및 평량 허용오차 등으로 인해 동일한 원지배합이라 할지라도 다소의 중량차이가 발생할 수 있고, 또한 KS 표준규격상 라이너, 골심지에 대한 평량 허용차가 ${\pm}4%$, 외부포장용골판지의 수분함량 허용오차가 $10{\pm}2%$임을 감안해서, 현재 명확치 않은 중량 허용오차 기준을 ${\pm}5%$로 개정하는 것이 상당하다는 판단을 골판지포장기업 35개사를 대상으로 설문조사한 자료를 바탕으로 보고서를 작성하여 함께 제출하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.849-851
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• 2010

This paper applicate to the large flowers management house, personal office or home, which breed flowers for the profit or hobby. We suggest flower water supply assistant, which supply water anytime to prevent die from water shortage. Our system applicate to the flowerpot less than two at first. We measure humidity by use humidity sensor and control water supply valve automatically. The water supply valve will be opened when the humidity drop to the less than critical values.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.2
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• pp.188-194
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• 2006

Since the late 1920's possibility of commercial hydroponics was testified practically. Hydroponics is used as environmentally friendly agriculture production system recently with high effectiveness. Now that existing irrigation control systems such as time control or solar radiation control cannot satisfy stable water content in root substrates, the needs for new irrigation system keep increasing. In this paper, we proposed environmentally friendly automatic irrigation management system by employing automation system based on electronic control system, which could solve problems based on manual irrigation management system. In addition, it suggested to be applied to any crops and will be able to overcome existing limit in irrigation by measuring the water content of root substrate in realtime.