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RISS 인기검색어
- 검색키워드
- 저자 : 김성환(Seong Hwan Kim) (검색결과 527 건)
- 무료
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- 유료
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김성환,임정현,박나형,문창종,박수현,강성수,배춘식,김성호,신동호,김종춘,Kim, Sung-Hwan,Lim, Jeong-Hyeon,Park, Na-Hyeong,Moon, Changjong,Park, Soo-Hyun,Kang, Seong-Soo,Bae, Chun-Sik,Kim, Sung-Ho,Shin, Dong-Ho,Kim, Jong-Choon 대한수의학회 2010 대한수의학회지 Vol.50 No.2
This study investigated the potential effects of amitraz on the pre- and postnatal development, behavior, and reproductive performance of offspring of parent rats given amitraz during pre-mating, gestation, and lactation. The test chemical was administered via the drinking water containing 0, 40, 120, and 360 ppm to male rats from 2 weeks before mating to the end of 14-day mating period and to females from 2 weeks before mating, throughout mating, gestation and lactation up to weaning. Based on fluid consumption, the male rats received an average of $0,\;5.7{\pm}1.33,\;13.2{\pm}2.08,$ and $35.8{\pm}3.42$ mg/kg/day amitraz, and the female rats received an average of $0,8.7{\pm}4.42,\;20.1{\pm}9.60,\;and\;47.6{\pm}22.38$ mg/kg/day amitraz, respectively. At 360 ppm, an increase in the incidence of abnormal clinical signs, a suppression in the body weight gain, a decrease in the food consumption and litter size, an increase in the post-implantation loss, and a decrease in the seminal vesicle weight were observed in the parent animals. In addition, a suppression in the body weight gain, a decrease in the grip strength, a delay in the negative geotaxis, an increase in the pre- and post-implantation loss, and a decrease in the number of live embryos were observed in the offspring. At 120 ppm, suppressed body weight gain and reduced food consumption were observed in the parent rats. Suppressed body weight gain and decreased grip strength were also observed in the offspring. There were no signs of either reproductive or developmental toxicity at 40 ppm. Under these experimental conditions, the no-observed-adverse-effect level of amitraz for parent rats and their offspring was estimated to be 40 ppm in rats.
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소프트웨어 정의 라디오를 이용한 전이중 통신 시스템의 연구
김성환,이웅섭,류종열,반태원,Kim, Seong Hwan,Lee, Wongsup,Ryu, Jong Yeol,Ban, Tae-Won 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.2
In this paper, we analyze the effect of mobility on the performance of full-duplex radio. For this, we implement a full-duplex radio prototype using a software-defined radio that is powered by a battery and can thus function in mobile environments. In addition, we compare the performance of self-interference cancellation schemes for two cases considering multi-antenna based full duplex radio and circulator based full duplex radio, respectively. Finally, we show a negative effect of mobility on the self-interference cancellation performance of the full-duplex radio system, and analyze the effect of the update period of the self-interference cancellation filter on the performance. In particular, when the update period is reduced by about 1000 times, the power of self-interference is reduced by 5.7dB for circulator-based full-duplex radio and 3.1dB for both antenna-based full-duplex radio.
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김성환,Kim, Seong-Hwan 대한병원협회 2007 대한병원협회지 Vol.36 No.4
"제가 의사가 된것은 아버님이 원해서가 아니라 바로 제자신이 하고 싶었기 때문이지요. 바로 아버님처럼 외과의사가 되고 싶어서 의과대학에 갔고 의사가 된 것입니다" 한원곤 원장에게 있어서 비인기과로 전락했다는 것은 아무런 문제가 되지 못한다. 본인이 그렇게 원해서 된 외과의사이기 때문이다
ScienceON
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