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P32 추적자법(追跡子法)에 의한 토양의 유효 인산정량법에 관한 연구(Ⅱ)
박훈,이춘영 한국농화학회 1970 Applied Biological Chemistry (Appl Biol Chem) Vol.13 No.1
The present study has been undertaken to see if any proper measure be found for the determination of available phosphorus by chemical extraction on the basis of A-values as the standard. The results obtained are described as follows. 1. Since A-value of the samples under study showed a significant correlation with Fe-P at 1% level. The available phosphorus in the present paddy soils was considered to be affected by Fe-P. 2. Six methods for chemical extraction were not correlated with the determination of Fe-P, proving them inadequate for the quantitative measurement of available phosphorus. 3. Adequate method for extracting available phosphorus in paddy soils should rest on the measurement of the reduction intensity of Fe-P. The extractable intensity was estimated to be 270 ppm in average. 4. Bray No. 2-P showed significant correlation with Lancaster-P, Spurway-P, Truog-P, and (Ca+Al)-P at 5% level. Olsen-P and Lancaster-P indicated significant correlation with Al-P and Spurway-P with Ca-P respectively at 1% level.
산전에 발견된 거대 제4형 아가미틈새낭에서의 분만 중 자궁 외 치료 시술 1예
박훈,진효승,강승현,박준식 대한이비인후과학회 2015 대한이비인후과학회지 두경부외과학 Vol.58 No.11
Large neck masses in the fetus can result in neonatal hypoxia with airway obstruction during a delivery. The ex-utero intrapartum treatment (EXIT) is a procedure that would be helpful in safely securing a fetal airway when the maternal-fetal circulation is being obstructed. Branchial cleft cyst (BCC) is a relatively common congenital malformation in the neck, however, the fourth BCC is very rare. Herein, we present a case of a giant fourth BCC, which was prenatally detected on ultrasound and safely surgically treated to secure an airway with EXIT procedure during the delivery.
박훈,HyunSeock Jie,채근화,박종구,Masakazu Anpo,Dok-Yol Lee 한국물리학회 2008 Current Applied Physics Vol.8 No.6
Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment. Anatase-type TiO₂ nanopowders less than 10 nm in average diameter were synthesized by a chemical vapor synthesis method. The TiO₂ nanopowders showed very poor photocatalytic properties, in spite of their large surface area. With subsequent heat treatment of the TiO₂ powders, their photocatalytic properties determined by measuring the degradation of 2-propanol were improved at temperatures up to 600˚C and then diminished along with formation of a rutile phase. This improvement in the photocatalytic properties of TiO₂ nanopowders was attributed to both a morphology change and a change in the electronic surface characteristics of TiO₂ particles during heat treatment.
전도공법에 의한 축소모형 철근콘크리트 구조물의 지반진동 특성
박훈,김승곤 한국자원공학회 2007 한국자원공학회지 Vol.44 No.6
본 연구에서는 실제 구조물과 특정 상사관계를 가지는 축소모형 구조물을 제작하였다. 축소모형 구조물을 전도공법에 의해 발파하여 발생되는 지반진동을 발파진동과 충격진동으로 구분하였다. 또한 지반조건이 서로 다른 토양층과 콘크리트층에 대해 각 방향별 최대진동속도, 주주파수를 분석하였다. 분석 결과 지반조건에 관계없이 충격진동이 발파진동보다 크게 발생하였으며, 거리가 증가함에 따라 감소하였다. 발파진동의 경우 콘크리트층에서는 거리가 증가함에 따라 감소하였으나, 토양층에서는 진행방향 성분을 제외하고 뚜렷한 경향을 보이지 않았다. 지반조건에 관계없이 발파진동의 주주파수 대역이 충격진동의 주주파수 대역보다 더 높게 나타났다. 전체 주주파수 대역은 충격진동의 주주파수 대역과 거의 동일하였다. In this study, the small-scaled RC structure which has a specific relationship of similitude with the prototype RC structure was designed and fabricated. As the small-scaled RC structure was demolished by means of the felling method, occurred the ground vibration was divided by the blasting vibration and the impact vibration. Also, against the soil layer and the concrete layer where ground conditions were different each other, it analyzed peak particle velocity and dominant frequency in each direction. According to the analysis, the impact vibration was occurred a higher peak particle velocity than the blasting vibration independently ground conditions. As the point of measurement was receded, peak particle velocity decreased. In the case of blasting vibration, peak particle velocity decreased by receding the point of measurement from the concrete layer, but it was not visible a clear tendency from the soil layer. The blasting vibration has a higher dominant frequency band than the impact vibration. The dominant frequency band of the ground vibration was similar to that of the impact vibration.