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토양에 점토광물 일라이트 처리시 고추의 생장에 미치는 영향
이석언(Seok Eon Lee),김덕현(Deok Hyun Kim),홍현기(Hyeon Ki Hong),권상문(Sang Moon Kwon),이문순(Moon Soon Lee),우선희(Sun Hee Woo),정근욱(Keun-Yook Chung) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.3
점토광물 일라이트를 이용하여 고추의 생육증진 효과를 평가하기 위하여 2010년 충북대학교 농업생명환경대학 농장에서 시험을 수행 하였다. 시험은 토양을 이용하여 수행하였으며 일라이트 처리는 기준량 처리 1:20 (w/w), 2배량 처리 1:10 (w/w)로 처리하였으며 재배기간 동안 수분공급 이외에 다른 영양성분은 일체 공급하지 않았다. 고추는 대촌을 선택하여 실험하였으며 작물의 양이온 K, Ca, Mg의 흡수량을 측정하여 일라이트 처리에 따른 효과의 차이를 평가하였다. 6주간의 생육 특성을 비교 해본 결과 고추는 무처리구 대비 7~31%의 생장이 증가함을 보였다. 처리량에 따른 고추의 뿌리, 줄기, 잎에서의 무처리구 대비 처리구의 흡수량은 K가 무처리구 대비 뿌리에서 2~8%, 줄기 34~68%, 잎에서 30~76%, Ca는 뿌리에서 -4~23%, 줄기에서 49~107%, 잎에서 22~49%, Mg는 뿌리는 -3~21%, 줄기에서 38~126%, 잎은 32-93%의 차이를 보였다. 이를 통해 고추 대촌은 일라이트 처리량에 따라 양분흡수량이 증가한다는 것을 확인할 수 있었다. 이 점으로 인하여 고추의 생장에 차이가 발생하였다고 여겨진다. This study was performed to examine the effect of the clay mineral illite on the improvement of soil and plant growth. Red pepper (Capsicum annuum L.) was used as a test vegetable crop. The experiment was performed during six weeks in the plantation of the Chungbuk National University. Its seedlings were cultivated in the soil normally used for horticultural purpose. Among the seedlings germinated the healthy and regular size of seed were selected and cultivated in the plantation. They were treated with two forms of illite, particulate (PA) and powder (PW), at the following application rates: standard application[P1 (PA1, PW1), soil: illite = 1:20 (w/w)] and two times [P2 (PA2, PW2), 1:10 (w/w)] of standard application. Untreatment (P0) was used as a control soil. At six weeks of cultivation, their growth lengths were correspondingly increased as the application rate was increased ranging from P0, P1, and P2. Their growth length was a little greater with the application of powder illite (PW) than with the particulate illite (PA). Based on the plant analysis of root, leaf, and stem of red pepper, the uptake amounts of K, Ca, and Mg, were correspondingly increased, as the application rate was increased ranging from P0, P1, and P2 respectively. At the same application rate, their amounts taken up in the respective parts were higher with the application of PW illite than on the PA one. Especially the amounts of Ca and Mg were higher in the stem and leaf than root. Consequently, it appears that the illite treatment, especially, PW form of illite, enhance the growth of red pepper in the plantation during the six weeks of experiment.
SEPIC을 이용한 고역율 정류회로의 과도응답특성 개선
정석언(Seok-Eon Joung),이교범(Kyo-Beum Lee),현동석(Dong-Seok Hyun),송중호(Joong-Ho Song) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
A pulse frequency control(PFM) method for single-phase SEPIC-type rectifier is described in this paper. In the SEPIC rectifier, a relationship between the output power and the respective switching frequency is investigated to establish the control scheme of PFM. The propsed control method is provided with a feed-forward control loop of the output load as well as a feed-back control loop of the output voltage. The simulation results show good dynamic responses and unity power-factor operation.
상토에서 일라이트의 혼합비율에 따른 고추 육묘시 생육효과
이석언(Seok-Eon Lee),김홍기(Hong-Ki Kim),권상문(Sang-Moon Kwon),김희정(Hee-Jung Kim),유리비(Ri-Bi Yoo),백기태(Ki-Tae Baek),이문순(Moon-Soon Lee),우선희(Sun-Hee Woo),박민(Man Park),정근욱(Keun-Yook Chung) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.6
점토광물 일라이트를 이용하여 고추의 생육증진 효과를 평가하기 위하여 2010년 충북대학교 첨단원예 유리온실에서 시험을 수행 하였다. 시험은 상토를 이용하여 수행하였으며 일라이트 처리는 기준량 처리 1:20 (w/w),2배량 처리 1:10 (w/w), 4배량 처리 1:5 (w/w)의로 처리하였으며 재배기간 동안 수분공급 이외에 다른 영양성분은 일체 공급하지 않았다. 고추는 대촌을 선택하여 실험하였으며 작물의 양이온 K, Ca, Mg의 흡수량을 측정하여 일라이트 처리에 따른 효과의 차이를 평가하였다. 6주간의 생육 특성을 비교 해본 결과 고추는 무처리구대비 1~21%의 생장이 증가함을 보였다. 처리량에 따른 고추의 뿌리, 줄기, 잎에서의 무처리구 대비 처리구의 흡수량은 K가 무처리구 대비 뿌리에서 -0.09-32%, 줄기 34-85%, 잎에서 29-110%, Ca는 뿌리에서 -12-29%, 줄기 49-120%, 잎에서 22-86%, Mg의 뿌리는 -0.3-56%, 줄기 40-128%, 잎은 31-155%의 차이를 보였다. 또한 고추 대촌은 일라이트 처리량에 따라 양분흡수량이 증가한다는 것을 확인할 수 있었으며 이로 인하여 고추의 생장의 차이가 발생하였다고 사료된다. This study was performed to explore the effect of the clay mineral illite on the improvement of bed soil and plant growth. Red pepper (Capsicum annuum L.) was used as a model vegetable crop. The experiment was performed during the whole six weeks in the glass house of the Chungbuk National University. Its seedlings were cultivated in the bed soil normally used for horticultural purpose. Of the seedlings cultured, the healthy and regular size of seed were selected and cultivated in the pots. They were treated with two forms of illite, particulate (PA) and powder (PW), at the following application rates: standard application[P1 (PA1, PW1), 1:20 (w/w)], two times[P2 (PA2, PW2), 1:10 (w/w)], and four times[P4 (PA4, PW4), 1:5 (w/w)] of standard application. Untreatment (P0) was used as a control pot. At six weeks of cultivation, their growth lengths were correspondingly increased as the application rate was increased ranging from P0, P1, P2, and to P4. Their growth length was a little greater on the application of powder illite (PW) than on the particulate illite (PA). Based on the plant analysis for the root, leaf, stem of red pepper, the uptake amounts of K, Ca, and Mg, were correspondingly increased, as the application rate was increased ranging from P0, P1, P2, and to P4, respectively. At the same application rate, their amounts taken up in the respective parts were higher on the application of PW illite than on the PA one. Especially the amounts of Ca and Mg were higher in the stem, leaf than root. Consequently, it appears that the illite treatment, especially, PW form of illite, enhance the growth of red pepper in the glass house during the whole six weeks of experiment.
반탄화 목분을 이용한 계면활성제의 흡착 및 생태독성에 관한 연구
이석언(Seok Eon Lee),오영환(Young Hwan Oh),이학주(Hak Joo Lee),한현조(Hyun Jo Han),남정빈(Jeong Bin Nam),양승민(Seung Min Yang),강석구(Seog Goo Kang) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
The area with damaged wood by pest in Korea currently covers about 10.1 thousand hectares, which is annually increasing. In this study, an application possibility of torrefied wood flour made from those damaged wood as a water treatment agent has been examined as compared with activated carbon, the existing one. Torrefied wood flour has been manufactured out of damaged wood by pest under the condition of high heat treatment, and an experiment with surfactant on the effect of water treatment has been conducted using to the torrefied wood flour through this study. While surfactant is a major cause of water pollution, it is being used in various ways such as medicine, detergent and agricultural chemicals, which brings about many social problems. In the experiment, adsorbent was mixed with C-PAM, torrefied wood flour and activated carbon in a ratio of ten to one respectively. Also, activated carbon, a current water treatment agent, was to be used as comparative material. Biodegradability, adsorption performance according to the change of concentration, and ecotoxicity value of surfactant has been tested in this study to figure out its possibility as an adsorbent. It has been confirmed that the surfactant degraded by about 90% within 15 days. In the light of the change in concentration of surfactant, both torrefied wood flour and activated carbon have the adsorption capacity as surfactant. It appeared that the adsorption performance of torrefied wood flour was about 20% higher than that of activated carbon when its dosage condition was 2%. In addition, the TU value in ecotoxicity from the filtrate of the processed torrefied wood flour with the highest adsorption. In conclusion of the study, it has been confirmed that, based on the result of ecotoxicity value and adsorption performance of surfactant, torrefied wood flour has an application possibility as a water treatment agent which can replace activated carbon.