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RISS 인기검색어
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- 저자 : 한영호(Y.H. Han) (검색결과 8 건)
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Mn - Zn 페라이트의 전·자기적 물성에 미치는 공정변수의 영향 고찰
황진현(J. H. Hwang),신명승(M. S. Shin),한영호(Y. H. Han) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
The effect of oxide additive system and Po₂ condition on the power loss, microstructure, initial permeability (μi), sintered body density, μi vs. temperature curve of Mn-Zn ferrites has been investigated. The density and permeability increased with various additive systems while the power loss decreased. It was confirmed that the oxide additives are grain boundary materials and do not change the magnetic properties of Mn-Zn ferrites such as Tspm and Tc. The μi vs. T curve indicated that Tspm moved to the higher temperature as Po₂ increased. It was also confirmed that the microstructure of Mn-Zn ferrites was independent of the Po₂ control during cooling.
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박은경,이상민,한영호,이종연,권세윤,김인영,김선일,Park E. K.,Lee S. M.,Han Y. H.,Lee J. Y.,Kwon S. Y.,Kim I. Y.,Kim Sun I. 대한의용생체공학회 2004 의공학회지 Vol.25 No.6
혈압은 심혈관계 질환을 비침습적인 방법으로 진단할 때 사용하는 중요한 생리적 지표 중 하나이다. 보통 동맥 혈압을 측정하기 위해 사용되는 기존의 비침습적인 방법들은 커프를 사용해야 하며. 연속적 혈압 측정이 어렵다. 수축기 혈압과 맥파전달시간은 서로 반비례 관계를 가지고 있다. 실험은 피검자로부터 휴식을 통한 평온한 상태와 운동을 통한 격한 상태로부터 수축기 혈압과 맥파전달시간 데이터를 얻었다. 얻어진 데이터를 이용하여 각 피검자용 회귀식과 전체 피검자용 회귀식을 만들기 위해 선형회귀분석을 하였다. 만들어진 회귀식의 정확도를 검증하기 위해 측정한 수축기 혈압값과 예측한 수축기 혈압값을 비교하였다. 비교 결과, 각 피검자용 회귀식이 혈압계는 오차의 평균과 표준편차가 각각 ±5mmHg, 8 mmHg를 가져야 된다고 규정한 American National Standards Institute of the Association of the Advancement of Medical Instrument (ANSI/AAMI)에 적합하였다. 그러나 전체 피검자용 회귀식은 ANSI/AAMI의 규정에 적합하지 않았다. 이 결과는 맥파전달시간과 각 피검자에 맞는 초기 보정을 통해서 커프를 사용하지 않고, 연속적으로 수축기 혈압을 측정할 수 있음을 의미한다. Blood pressure (BP) is one of the important physiological parameters for diagnosing cardiovascula diseases by means of noninvasive method. Existing noninvasive methods for measuring arterial BP have to use cuff and difficult in measuring arterial BP continuously. Systolic blood pressure (SBP) and pulse transit time (PTT) have a kind of inverse relationship. We acquired PTT data when subjects were in relaxation and also after exercise. We performed the linear regression analysis for making the regression equations for each subject and the regression equation for all subjects. We compared the estimated SBP with the measured SBP to check the accuracy of our regression equations. From the result, the regression equations for each subject was appropriate according to the American National Standards Institute of the Association of the Advancement of Medical Instrument (ANSI/AAMI) which says that BP devices should have ±5mmHg mean of error and 8mmHg standard deviation of error. However, the regression equation for all subjects was not proper to ANSI/AAMI recommendation. The result means that, without cuff, we can continuously estimate each subject's SBP through PTT and indivisual calibration.
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TiO₂ 첨가가 Mn - Zn Ferrites의 자기적 특성에 미치는 영향
박종원(J. W. Park),한영호(Y. H. Han),이상효(S. H. Lee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.6
Mn-Zn ferrites에 TiO₂가 첨가될 때 전력손실, 밀도, 초기투자율, 저항, 그리고 미세구조의 변화를 고찰하였다. 첨가량이 증가함에 따라 밀도는 증가했지만, 초기투자율은 감소하였다. TiO₂의 첨가에 따라 electron hopping을 일으키는 활성화에너지와 전기저항이 증가하였다. 1150 ℃에서 소결한 TiO₂를 1.5 wt% 첨가한 시편은 1 ㎒, 25 mT, 80 ℃에서 83 ㎽/㎤의 전력손실을 나타내었다. 그러나 1200 ℃에서 소결할 때는 과대입성장이 발생하여 같은 측정 조건에서 1168 ㎽/㎤의 전력손실을 얻었다. The effect of TiO₂ addition has been studied on the power loss, density. initial permeability, resistivity, and microstructure of Mn-Zn ferrites. TiO₂ addition increased the density of sintered body and decreased of the initial permeability. Activation energy for electron hopping as well as electrical resistivity increased with TiO₂ addition. The toroidal core sintered at 1150℃ with 1.5 wt% of TiO₂ demonstrated the power loss of 83 ㎽/㎤ at 1 ㎒, 25 mT, 80℃. However, the same specimen sintered at 1200℃ lead to the power loss, 1168 ㎽/㎤ at 1 ㎒, 25 mT, 80℃ and developed an exaggerated grain growth.
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Chip inductor용 Co₂Z type Ba - ferrite의 저온소결에 관한 연구
조균우(K. W. Cho),한영호(Y. H. Han),문병철(B. C. Moon) 한국자기학회 2002 韓國磁氣學會誌 Vol.12 No.5
Low temperature sintering of Co₂Z type Ba ferrites with various oxide additives has been studied. Co₂Z phase was obtained by 2 step calcination and XRD peaks showed a good agreement with the peaks of the standard Co₂Z phase, except for some minor extra peaks. ZnO-B₂O₃ glass, ZnO-B₂O₃ and CuO, ZnO-B₂O₃ and Bi₂O₃, and ZnO-Bi₂O₃ glass were added to lower sintering temperatures. Specimens were sintered at the temperature range between 900℃ and 1000℃. In the single addition of ZnO-B₂O₃ glass, the specimen with 7.5 wt% showed the highest shrinkage. Specimens with complex addition of ZnO-B₂O₃ glass with CuO or Bi₂O₃ showed higher shrinkages and initial permeabilities than single addition of ZnO-B₂O₃ glass. Shrinkages and initial permeabilities of the specimens with ZnO-Bi₂O₃ glass were higher than those of ZnO-B₂O₃ glass addition.
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TiO₂ 첨가가 Mn - Zn Ferrites의 자기적 특성에 미치는 영향
박종원(J. W. Park),한영호(Y. H. Han),이상효(S. H. Lee) 한국자기학회 1999 韓國磁氣學會誌 Vol.9 No.6
Mn-Zn ferrites에 TiO₂가 첨가될 때 전력손실, 밀도, 초기투자율, 저항, 그리고 미세구조의 변화를 고찰하였다. 첨가량이 증가함에 따라 밀도는 증가했지만, 초기투자율은 감소하였다. TiO₂의 첨가에 따라 electron hopping을 일으키는 활성화에너지와 전기저항이 증가하였다. 1150 ℃에서 소결한 TiO₂를 1.5 wt% 첨가한 시편은 1 ㎒, 25 mT, 80 ℃에서 83 ㎽/㎤의 전력손실을 나타내었다. 그러나 1200 ℃에서 소결할 때는 과대입성장이 발생하여 같은 측정 조건에서 1168 ㎽/㎤의 전력손실을 얻었다. The effect of TiO₂ addition has been studied on the power loss, density. initial permeability, resistivity, and microstructure of Mn-Zn ferrites. TiO₂ addition increased the density of sintered body and decreased of the initial permeability. Activation energy for electron hopping as well as electrical resistivity increased with TiO₂ addition. The toroidal core sintered at 1150℃ with 1.5 wt% of TiO₂ demonstrated the power loss of 83 ㎽/㎤ at 1 ㎒, 25 mT, 80℃. However, the same specimen sintered at 1200℃ lead to the power loss, 1168 ㎽/㎤ at 1 ㎒, 25 mT, 80℃ and developed an exaggerated grain growth.
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MoO₃ 첨가가 Mn - Zn Ferrites의 투자율에 미치는 영향
장정수(J. S. Jang),신명승(M. S. Shin),한영호(Y. H. Han) 한국자기학회 2001 韓國磁氣學會誌 Vol.11 No.1
The effect of MoO₃ addition on the permeability of Mn-Zn ferrites was studied. 600 ppm, 800 ppm and 1,000 ppm of MoO₃ were added to the main composition after calcination. Ferrite cores were sintered at 1350 ℃ for 3hrs, followed by cooling according to the equilibrium oxygen concentration. The initial permeability was about 8,000 with heating rate 5℃/min for 3hrs without MoO₃ addition. When 600 ppm and 800 ppm of MoO₃ were added, the initial permeabilities, 13,200 and 13,550 were obtained, respectively. However, the sample with 1,000 ppm MoO₃ showed lower permeabilities because of abnormal grain growth. At the heating rate 10℃/min, the ferrite cores with 1,000 ppm MoO₃ demonstrated the highest initial permeability greater than 15,000, without exaggerated grain growth.
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