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황산알루미늄의 가수분해에 의해 석출된 AlO(OH) 겔의 숙성시간이 판상 α-Al<sub>2</sub>O<sub>3</sub>의 결정성장에 미치는 영향
최동욱,박병기,서정권,이정민,Choe, Dong-Uk,Park, Byung-Ki,Suh, Jeong-Kwon,Lee, Jung-Min 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.9
To precipitate the complex gel of flux and aluminum hydroxides gel, aqueous solution of the mixture of $Na_2CO_3\;and\;Na_2PO_4{\cdot}12H_2O$ was added with stirring in aqueous solution of the mixture of $Al_2(SO_4)_3{\cdot}14{\sim}18H_2O,\;Na_2SO_4$, and then the complex gel was aged in $0{\sim}30h\;at\;90^{\circ}C$. As aging time passed, the aluminum hydroxides was grown into the acicular AlO(OH) gel. Also, aging time had an effect on physical properties of the AlO(OH) gel and on crystal growth of the flaky ${\alpha}-Al_2O_3$ prepared by molten-salt precipitation. In this study, the complex gel was crystallized in temperature range of $400{\sim}1,200^{\circ}C$ after drying at $110^{\circ}C$, and then it was investigated to effect of aging time on precipitation temperature, size, thickness, morphology and particle size distribution of the flaky ${\alpha}-Al_2O_3$ crystal. As aging time passed, the flaky a${\alpha}-Al_2O_3$ crystal showed a tendency toward an increase in size and thickness as result from an increase in BET surface area and pore volume of the acicular AlO(OH) gel.
최동욱,박민수 정보통신정책학회 2019 정보통신정책연구 Vol.26 No.3
Commercial breaks in terrestrial television programs are not allowed unlike in pay-TV programs in Korea. A rigorous investigation of the effects of commercial breaks in television programs is called for amid a long-lasting debate over a shift in the ban on the breaks. Terrestrial network television operators have introduced “pseudo commercial breaks” which are inserted between two clumsily split parts of programs and called them “premium commercial messages (PCM)”. In contrast to previous studies utilizing data on commercial breaks in pay-TV channels, we aim to predict the effects of commercial breaks in terrestrial TV programs by analysing empirically data on PCM. This study uses high-frequency data from Nielsen Korea on advertisement and audience rates of terrestrial and pay-TV programs from January 1, 2016 through December 31, 2017. A difference-in-differences (DID) method is used by exploiting variation in the dates of introduction of PCM across programs as the main source of identification. The results show that PCM increased the amount and the audience rating of advertisements, and that operator revenue swelled despite no significant change in the price of advertisements. These effects of PCM vary depending on the genres of the programs. We also find that PCM did not lead terrestrial TV programs to steal audiences or advertisers from the competing pay-TV programs. 지상파 중간광고 도입에 대한 찬반이 여전한 가운데 중간광고 도입의 효과에 대한 엄밀한 예측의 필요성이 다시금 부각되고 있다. 케이블TV 채널의 중간광고 자료를 이용해 지상파 중간광고의 효과를 예측했던 기존 연구와 달리 본 연구는 지상파 유사중간광고(PCM) 도입의 영향 분석을 통해 지상파 중간광고 도입효과에 대한 시사점을 제시하고자 한다. 본 연구는 닐슨으로부터 2016년 1월 1일부터 2017년 12월 31일까지의 지상파 및 케이블TV 채널의 광고 및 시청률 자료를 수집하여 분석에 활용했다. PCM 도입 여부와 시기가 프로그램마다 다르다는 점에 착안하여 처치군과 통제군을 설정하고 이중차분법(difference-in-differences method)을 적용하였다. 분석 결과, PCM도입이 광고량과 광고시청률을 유의하게 증가시켰지만 광고가격의 변화는 나타나지 않았다. 또한 장르에 따라 PCM의 효과가 차별적으로 나타나는 것을 확인할 수 있었다. PCM의 도입은 동시간대의 경쟁 케이블프로그램에 유의한 영향을 미치지 않았다. PCM이 도입된 지상파 프로그램은 그렇지 않은 프로그램에 비해 유의하게 높은 광고수입을 올린다는 것을 확인할 수 있었다.
Weight Cycling에 따른 레슬링선수의 신체구성 및 혈액성분 변화
최동욱,류승필,이수천,김영범 한국운동영양학회 1997 Physical Activity and Nutrition (Phys Act Nutr) Vol.1 No.1
Ten wrestlers were used as human subjects and divided into two groups(weight cycle and non-weight cycle) in order to study the effects of 3 times weight cycling on body composition, waist to hip ratio and blood composition. The body composition including body fat, fat free mass were significantly increased in the weight cycling group by repeated weight cycling. The waist to hip ratio was considerably increased in the cycle group . The level of glucose and insulin in blood was not highly changed by repeated weight cycling, whereas the triglyceride was remarkably increased and decreased dependent on body weight during weight cycling. Free fatty acid concentrations in blood were in inverse proportion to body weight during weight cycling. These results suggest that body weight could not be efficiently reduced by the repeated weight cycling in certain period time, and physical ability for game might be decreased by increasing rate of body fat and decreasing rate of fat free mass according to the weight.