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異方性 Ba-ferrife의 磁性에 미치는 SrCO₃의 添加效果
全鶴坤,吉炳龍,李東熙 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.1
The effect of SrCO₃addition on the improvement of magnetic properties of anisotropic Ba-ferrite was studied by employing the crystallographic investgation into the change of structural orientation due to the addition and subsequent treatment. From the results obtained in these experiments, the followings were concluded; Ba-farrite containing 1.3wt. % Sr, i.e. (Ba0)₁(Sro)??- 5.45 Fe₂O₃,has showed the highest improvement of magnetic properties when sintered at 1250℃ for one hour, where the measured Br,??H?? and (B·H)???were respectively 3,500G, 2,600 Oe and 3.4 MG Oe. The orientaion parameter of this composite was 0.71, and an linear relationship, q=6x10? Br+0.502, was also found between the orentation parameter q and remanence Br. The reasons for these could be attributed to the facts that; (1) this content of Sr falls into the reported optimum range (5.2-5.8) of the mloe ratio of FeOł涍/(BaO)-(SrO). The proper amount of Sr is believed to enhance the formation of a complex ferrite, (BaO)??(SrO)??-n Fe₂O₃, through the diffusional process replacing some of Ba????ions by Sr????ions in the ferrite structure. (2) The possible eutectic reaction between SrO and BaO could be occured at as low as 1250 ˚C and may result in the impoved sinterability of the compacts through the liquid-phase like sintering. ·
점증 부하 운동 시 정상인과 뇌졸중 환자의 심폐기능 및 에너지 대사 비교
김지혜(Ji-Hye Kim),염주노(Ju-No Yeom),유인태(In-Tae Ryu),임재길(Chae-Gil Lim),황병용(Byong-Yong Hwang) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.2
본 연구의 목적은 정상군과 뇌졸중 환자군의 하지 에르고미터를 이용한 점증적 부하 운동 시 나타나는 심폐기능 및 에너지 대사에 대해 알아보기 위해서이다. 정상군 11(남자:6, 여자:5)명, 뇌졸중 환자군 9(남자:4, 여자:5)명을 대상으로 18분 동안 하지 에르고미터를 이용하여 6분에 25watt 씩 점차적으로 증가하며 실시하였고, 이때 심폐기능 및 에너지 대사는 Quark b₂를 이용하였다. 정상군에서 점진적 부하 운동 단계는 유의하게 증가하였다. 심폐기능은 최대산소 섭취량 시간, 운동시간에서 유의하게 증가하였지만, 에너지 대사에서는 유의한 차이가 나타나지 않았다. 또한 심폐기능과 에너지대사는 높은 상관관계를 가졌다. 결과적으로 하지 에르고미터를 이용한 점증 부하 운동 시 18분 이내에서는 정상군과 뇌졸중 환자군의 심폐기능과 에너지 대사는 통계학적 차이를 보이지 않았지만, 최대 산소 섭취량과 운동 시간에서는 유의한 차이를 보였으며, 최대산소 섭취량과 관련이 있음을 확인할 수 있었다. The purpose of this study is to investigate the cardiopulmonary function and the energy metabolism of stroke patients and normal persons of graded load exercise using lower ergometer. Targeting 11 normal persons(male: 6, female: 5) and 9 stroke patients (male: 4, female: 5), an graded load exercise was performed with the use of lower ergometer by increasing 25 watts every 6 minute and Quark b₂ were used for the cardiopulmonary function and the energy metabolism. With respect to normal persons, there were significant increases in the phase of graded load exercise, maximum oxygen uptake time, exercise time with respect to the cardiopulmonary function. In addition, there was a significant correlation between cardiopulmonary function and energy metabolism, but there was no significant difference energy metabolism. As a result, there were no significant differences between stroke patients and normal persons of the cardiopulmonary function and the energy metabolism within 18 minutes, but it had significant differences between maximum oxygen uptake and exercise time. Moreover, it was possible to identify that the cardiopulmonary function and the en