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이상훈,정기택,박재구,류경근 漢陽大學校 環境工學硏究所 1997 環境科學論文集 Vol.18 No.-
무기질 담채에 대한 폐수증 미생물의 흡착 메카니즘에 대하여 두 입자간의 물리화학적 상호작용을 설명하는 DLVO이론을 도입하여 검토하였다. 실험에 사용된 흡착제는 평균입도가 약40㎛ 정도인 규석, 고령토, 석회석질의 입자 및 다공성의 벌크상 소재를 이용하였다. 시간에 따른 미생물 흡착량(biofilm mass)은 반응전후의 담체(carrier)의 질량차로 구하였으며, 이에따른 폐수중의 COD제거율을 측정·평가하였다. 실험결과 폐수중의 COD제거율은 석회석, 고령토, 담체의 순으로 높게 나타났으며, 이는 담체의 표면전위(ζ-potential) 및 표면구조에따른 미생물 흡착량 변화에 기인 하는 것으로 생각된다. The mechanisms of adsorption of microorganisms to inorganic solid surfaces are studied with DLVO theory of describing physico-chemical interaction between two particles. Average size of 40㎛ of silica, kaolin, limestone powders and porous materials are utilized as adsorbent. Biofilm mass is estimated by the weight difference of carrier before and after the interaction with microorganisms. Also, COD removal rates in wastewater based on biofilm mss are discussed. As a result COD removal rate is higher in order of limestone, kaolin, and silica. This fact is considered that 5-potentials and surface structures of carriers cause change in adsorption capacity of microorganisms.
Park, Mi-Ryung,Yoo, Jae Gyu,Hur, Chang-Gi,Sim, Bo-Woong,Kim, Myunghoo,Seo, Jakyeom,Kim, Byeong-Woo,Cho, Byung-Wook,Shin, Teak-Soon,Cho, Seong-Keun The Korean Society of Animal Reproduction and Biot 2020 한국동물생명공학회지 Vol.35 No.3
This study investigated the effect of variation in the number of somatic-cell-cloned embryos and their developmental stage at transfer on pregnancy, as well as the influence of the estrus status of recipient pigs on in vivo development of cloned porcine embryos after embryo transfer. For somatic cell nuclear transfer (SCNT), fibroblast cells were obtained from a male porcine fetus. Recipient oocytes were collected from prepubertal gilts at a local abattoir and then cultured. After SCNT, reconstructed embryos of different numbers and developmental stages were transferred into recipient pigs. The developmental stage of the cloned embryos and the number of transferred embryos per surrogate showed no significant differences in terms of the resulting cloning efficiency. However, the pregnancy rate improved gradually as the number of transferred cloned embryos was increased from 100-150 or 151-200 to 201-300 per recipient. In pre-, peri-, and post-ovulation stages, pregnancy rates of 28.6%, 41.8%, and 67.6% and 16, 52, and 74 offspring were recorded, respectively. The number of cloned embryos and estrus status of the recipient pig at the time of transfer of the cloned embryo affect the efficiency of pig production; therefore, these variables should be particularly considered in order to increase the efficiency of somatic cell pig cloning.
MODIS영상을 이용한 청주지역 NDVI의 시계열적 분석
박종화 ( Park Jong-hwa ),나상일 ( Na Sang-il ),전택기 ( Jun Teak-gi ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
We evaluated the six months of vegetation index product availability from the Moderate Resolution Imaging Spectroradiometer(MODIS) on board the Earth Observing System-Terra platform. One MODIS vegetation indices (VI), the normalized difference vegetation index (NDVI) is produced at 250m resolutions and 16-day compositing periods. In this study, enhancing spatial resolution method is adapted as to improve a low spatial resolution. Recent studies have successfully estimated NDVI using improved resolution method such as from the MODIS. Image enhancing spatial resolution is an important tool in remote sensing, as many Earth observation satellites provide both high-resolution and low-resolution multispectral images. Examples of enhancement of a MODIS multispectral image and a MODIS NDVI image of Cheongju using a Landsat TM high-resolution multispectral image are presented. The results are compared with that of the IHS technique is presented for enhancing spatial resolution of multispectral bands using a higher resolution data set. To provide a continuous monitoring capability for NDVI, in situ measurements of NDVI from paddy field was carried out in 2004 for comparison with remotely sensed MODIS data. Our results showed a good correspondence between NDVI with those from the MODIS sensor and in situ measurements of NDVI.
Mi-Ryung Park,Jae Gyu Yoo,Chang-Gi Hur,Bo-Woong Sim,Myunghoo Kim,Jakyeom Seo,Byeong-Woo Kim,Byung-Wook Cho,Teak-Soon Shin,Seong-Keun Cho 한국동물생명공학회(구 한국동물번식학회) 2020 Journal of Animal Reproduction and Biotechnology Vol.35 No.3
This study investigated the effect of variation in the number of somaticcell- cloned embryos and their developmental stage at transfer on pregnancy, as well as the influence of the estrus status of recipient pigs on in vivo development of cloned porcine embryos after embryo transfer. For somatic cell nuclear transfer (SCNT), fibroblast cells were obtained from a male porcine fetus. Recipient oocytes were collected from prepubertal gilts at a local abattoir and then cultured. After SCNT, reconstructed embryos of different numbers and developmental stages were transferred into recipient pigs. The developmental stage of the cloned embryos and the number of transferred embryos per surrogate showed no significant differences in terms of the resulting cloning efficiency. However, the pregnancy rate improved gradually as the number of transferred cloned embryos was increased from 100- 150 or 151-200 to 201-300 per recipient. In pre-, peri-, and post-ovulation stages, pregnancy rates of 28.6%, 41.8%, and 67.6% and 16, 52, and 74 offspring were recorded, respectively. The number of cloned embryos and estrus status of the recipient pig at the time of transfer of the cloned embryo affect the efficiency of pig production; therefore, these variables should be particularly considered in order to increase the efficiency of somatic cell pig cloning.