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고파랑이 내습하는 방조제 피복석의 안정성 평가 - 새만금방조제를 중심으로 -
손재권,고남영,김덕구,박설화,Son, Jae Gwon,Goh, Nam Young,Kim, Duk Gu,Park, Seol Hwa 한국농공학회 2016 한국농공학회논문집 Vol.58 No.4
This study is on the stability re-evaluation of armor stones in saemangum seadike according to recently increased sea-level and frequent high wave incoming and the results are in the following. The field inspection of armor stones in the seadike revealed that damages of armor stones have been caused by higher waves than designed waves and that the reconstruction of armor stones and concrete grouting method have been used as the reinforcement work. The result of numerical simulation of wave channel conducted to estimate the safety weight of armor stones influenced by flows revealed that the safety weight of armor stones in the seadike No.4 was estimated as 5.47 tons by using the Isbash method, which is about 122 % more than 4.49 tons estimated by using Van der Meer method. Therefore, in designing armor stones which can be influenced by high waves such as the case of Saemangum seadike, it is necessary to apply the safety weight method of armor stones, based on the Isbash method, which produced the significant figures among the safety weight methods using flows as well as the safety weight method using high waves based on the Hudson method.
孫在權,具滋雄,李長春 전북대학교 농업과학기술연구소 1994 農大論文集 Vol.25 No.1
This study was carried out in order to determin the optimum irrigation point, the interval of irrigation date and irrigation requirements of dry fie]d crops in reclaimed tidelands, and apply in planning of the irrigation projects. Growth experiments were conducted by irrigation point treatments using tomato with relatively high salt tolerance. The results of this study are summarized as follow : 1. The optimum irrigation point which maintains the salt concentration within salt tolerance and maximizes the crop yield in reclaimed tidelands of silt loam soil, was found to be pF 1.6 in tomato. 2. On the base of optimum irrigation point(pF 1.6), the interval of irrigation date of 1 day was proved to be effective. 3. The total irrigation requirement s and water requirement for the prevention of salt rise do-ling the growing period after transplanting wire estimated to be 602mm (6.7mm/day) and 232mm for tomato, respectively.
새만금 간척지 토양에서 벼생육 기간중 시비처리별 전기전도도 분석
손재권,최진규,구자웅,송재도,김영주,이용규,홍대벽,Son Jae Gwon,Choi Jin Kyu,Koo Ja Woong,Song Jae Do,Kim Young Ju,Lee Yong Kyu,Hong Dae Byuk 한국관개배수위원회 2004 한국관개배수논문집 Vol.11 No.1
This study was performed In order to analyze the changes of electrical conductivity (EC) by the fertilization treatments during the rice owing period in Saemangeum reclaimed tidal land soils. The objective of this study was to offer fundamental data for i
손재권,정병엽,장정렬,조재영 한국응용생명화학회 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.5
The occurrence, distribution, and ecological risk assessmentof 15 polycyclic aromatic hydrocarbons (PAHs) were investigatedin the Dongjin River water system from December 2010 toOctober 2012. Among the detected PAHs, the mean concentrationof acenaphthylene was the highest. Other PAHs were detected atvery low concentrations. The detection frequencies and concentrationsof the 15 PAHs were generally higher in the winter season,indicating low water flow conditions and low temperature. Theresults of a survey of the origin of the PAHs using the Phe/Antratio and Fla/Pyr ratio clearly indicated a pyrogenic source. Therisk quotient (RQ) values for the 15 PAHs in the Dongjin Riverwater system were below 0.01–0.1, indicating little risk to therelevant sensitive aquatic organisms, including green algae anddaphnids, by the target compounds. In particular, the RQ values ofmost of PAHs exceeded 0.1 for fish in all of the seasons at mostof the sampling sites, which indicated that the fish were exposedto medium risk.
새만금 간척지 밭 토양의 관개 방식별 관개용수량과토양 용적수분함량 변화 분석 연구
손재권,송재도 한국농공학회 2023 한국농공학회논문집 Vol.65 No.2
This study was conducted to analyze changes of irrigation water and soil volumetric water content by irrigation method of field soil in Saemangeumreclaimed tideland. The main test irrigation methods was surface drip irrigation, sprinkler irrigation, and sub drip irrigation. In addition, the correlationbetween irrigation amounts and crop yield by irrigation method was investigated. For soil volumetric water contents increases by 25%, surface dripirrigation took 1.5 hour, sprinkler irrigation took 2.0 hours, and sub drip irrigation took 3.0 hours. As a result of analyzing the irrigation amountsaccording to the yield, the surface drip irrigation was 2.66 mm/day in the seedling stages, 3.31 mm/day in the vegetative growth stages, and 5.09mm/day in the flowering stages. Sprinkler irrigation was 2.90 mm/day in the seedling stages, 3.87 mm/day in the vegetative growth stages, and 7.11mm/day in the flowering stages. Sub drip irrigation was 2.42 mm/day in the seedling stages, 3.09 mm/day in the vegetative growth stages, and 4.87mm/day in the flowering stages. It was analyzed that there was a statistically significant difference in irrigation amounts by fresh weight and irrigationmethod (F=4.002, p=0.022), and irrigation amounts by dry weight and irrigation method (F=3.499 p=0.034). Surface drip irrigation was judged to bemore appropriate than sprinkler irrigation or sub drip irrigation for field crops in Saemangeum reclaimed land.