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임선기,송헌식 한국화학공학회 1985 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.23 No.3
감마-알루미나에 담지된 니텔모델촉매의 소결현상을 젖은 수소분위기 하에서 시간과 온도의 함수로 실험하였다. 두가지의 초기결정체의 크기분포, 즉, 응집분산과 균일분산을 sputtering조건을 변화시킴으로써 얻을 수 있었다. 각 니켈결정체의 변화를 추적하기 위하여 매 열처리후마다 투과 전자현미경을 사용하여 시편의 같은 부분을 조사하였다. 니켈결정체의 표면은 ESCA로 관찰한 결과 산화상태로 존재함을 추측할 수 있었다. 최초의 1시간 동안에는 여러 변화들을 볼 수 있었는데 이것은 모든 가능한 소결기구를 적용하여 설명할 수 있다. 즉, 결정체이동기구, 원자이동기구 그리고 이 두가지 기구의 조합으로 설명할 수 있다. The sintering behaviors of the nickel model catalysts supported on γ-alumina were studied under wet hydrogen atmosphere as a function of sintering time and temperature. Two types of initial crystallite size distribution, i.e., the aggregated and the uniformly dispersed, could be obtained by controlling the sputtering conditions. The same region of a specimen was examined with a transmission electron microscope after each heat treatment to follow the change of each nickel crystallite. The surface of nickel crystallite was believed to be in the oxide state as observed by the electron spectroscope for chemical analysis. The various events which had occurred during the first one hour were identified, and they could be explained by applying all the possible sintering mechanisms, i.e., the crystallite migration, the atomic migation and the combination of the two.
두 가지 장단의 국악 연주가 심박변이도에 미치는 영향에 대한 비교
윤창준 ( Chang Joon Yoon ),류헌식 ( Heon Sik Ryu ),송미연 ( Mi Yeon Song ),신현대 ( Hyun Dae Shin ) 한방재활의학과학회 2007 한방재활의학과학회지 Vol.17 No.3
Objectives:This study was performed to show difference between two Korean music on autonomic nerve system by measuring Heart Rate Variability(HRV) for preliminary study of music therapy in oriental medicine.There are frequency domain analyses of HRV such as Total Power(TP), Low Frequency(LF), High Frequency(HF), and LF/HF Ratio.These are contributed to understanding of autonomic nerve system.Methods:The participants were 12 adult volunteer and 9 of them completed the test.Experiment divided for three sessions and HRV was measured after each sessions.After 5 minute of resting first session HRV was measured for baseline.After first session each participants were exposed on three conditions-HM(Huimori tempo of Gayagum), JM(Jinyang tempo of Germungo), NM(no music)-for 5 minute and second session HRV was measured.After second session, each participants were exposed on same conditions again for 5 minute and third session HRV was measured.TP, LF, HF, and LF/HF Ratio were measured and correlation of these parameters among each conditions were analyzed.Results:The result shows that HF component of HRV increased after sessions in JM condition compare to HM and NM condition(p < 0.01).There was no significant difference on TP, LF, and LF/HF Ratio.Conclusions:This result suggests that JM is more effective than HM increasing HF component of HRV.It presumes that JM is more effective in activating on parasympathetic nerve.