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AC 저항측정법을 이용한 강자성 니켈의 큐리온도결정과 순도가 니켈의 임계현상에 미치는 영향
양기원(Ki-Won Yang),이일수(Ilsu Rhee) 한국진공학회(ASCT) 1996 Applied Science and Convergence Technology Vol.5 No.2
니켈의 순도에 따른 임계현상의 변화를 보기 위해 여러 순도의 니켈에 대한 비저항의 온도의존성을 관찰하였다. 비저항은 lock-In 증폭기를 사용하여 ac 저항측정법으로 측정하였으며 이 경우 시료를 솔레노이드식으로 감아 저항부분과 인덕터부분의 신호를 함께 관찰할 수 있도록 하였다. 큐리온도는 이들 신호들이 갑작스럽게 변하는 온도로 결정하였으며 저항부분과 인덕터부분의 신호에서 결정한 큐리온도값들은 서로 잘 일치함을 볼 수 있었다. 비저항의 온도에 따른 일차미분에서 비열의 임계지수를 결정하였으며 큐리온도와 마찬가지로 임계지수의 순도의존성은 실험오차내에서는 없음이 관찰되었다. The purity dependence of the Curie point and the critical exponent of heat capacity has been studied by measuring the resistivity of nickel samples with several different purities. The resistivity was measured by the 4-point ac method with a lock-in amplifier. The Curie points determined from in-phase and out-of-phase signals were found to be consistent with each other. We found that the Curie point and the critical exponent of heat capacity did not depend on the purity of samples.
최근 10년간 (1994-2003) 서울성애병원에서 출생한 신생아 출생성비에 관한 통계보고
구인모 ( In Mo Ku ),고영채 ( Young Chae Ko ),이희 ( Hee Lee ),최원일 ( Won Il Choi ),양기원 ( Ki Won Yang ),구홍모 ( Hong Mo Koo ),김정욱 ( Jeong Wook Kim ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.10
목적 : 서울 성애병원에서의 최근 10년간의 출생 성비를 조사하고 향후 문제점을 재조명하고자 한다. 연구 방법 : 1994년부터 2003년까지 10년간 본 의료원에서 분만된 신생아를 대상으로 조사하였다. 첫번째 아이와 두번째 아이의 출생성비를 조사하였고 세번째 아기의 경우 3 group (첫째와 둘째가 여자인 경우, 첫째와 둘째가 남자인 경우, 첫째와 둘째가 남자와 여자가 공존하는 경우)으로 세분화해서 조사하였다. 자료는 분만대상과 환자의 의무 기록지에 Objective : This study was aimed to investigate of newborn babies sex ratio in Seoul Seong Ae hospital and review of future problem. Methods : We reviewed retrospectively the 21,332 cases of deliveries in women visiting at Seoul Seong Ae hospital from Jan
반사광 측정 모드에서 금과 은의 쌍금속 표면 플라즈몬 공명 칩의 특성과 임계각을 이용한 굴절률 계산
김형진 ( Hyungjin Kim ),이성엽 ( Sung Youp Lee ),김홍탁 ( Hong Tak Kim ),양기원 ( Ki Won Yang ),손영수 ( Young Soo Sohn ) 한국센서학회 2015 센서학회지 Vol.24 No.6
A bimetallic chip made of gold and silver was investigated in intensity interrogation mode to confirm enhancement of the SPR sensor resolution. Both reflectance curves of the bimetallic chip and the conventional gold chip was acquired and compared. The line width of the reflectance curve of the bimetallic chip was narrower than that of the conventional Au chip, resulting in steeper tangential slope. The reflectance was monitored at the angle related to the steepest tangential slope. The change in reflectance of the bimetallic chip was larger than that of the Au chip. The critical angle was analyzed by differentiating the reflectance with respect to incident angle twice. Acquiring the critical angle regarding to the sample informs the refractive index of the sample. Using various concentration of Bovine Serum Albumin, we confirmed that refractive index was linearly related to variation of reflectance of the bimetallic chip.
경골 원위 1/3 골절에서 골수강내 금속정을 이용한 치료
박성진,양기원,한대용,양규현,유환욱 대한골절학회 1999 대한골절학회지 Vol.12 No.4
Puropse: We evaluated the efficacy of intramedullary nailing in distal tibial fractures. Material and Method: Twenty-six patients with distal tibial fracture were treated with intramedullary nailing between Jan. 1996 and May 1998. Operation was done on the fracture table under skeletal traction. We evaluated the causes of trauma, type of fracture, location of fracture, time to union, malunion, nonunion, range of motion of knee and ankle, and degree of pain. Result: There were 4 cases of open fracture and 4 cases of closed soft tissue injury at fracture site. The time to fracture union was 19 weeks on average. One case(3.8%) did not heal by 10 months and was classified as nonunion. The union rate was 96.2 % and the complication rate was 7.7%(one case of nonunion and one case of malunion). There was no infection and soft tissue disruption. The range of motion of knee was reduced in 1 case(3.8%) and 2 patients(7.7%) complained of mild pain at the knee joint. The range of motion of the ankle joint was reduced in 4 cases(15.5%), averaging 15.5 degrees in dorsiflexion and 9 cases(34.6%), averaging 21 degrees in plantarflexion. Two patients complained of mild pain at the ankle joint. Conclusion: We had relatively good clinical and' radiological results and concluded that closed intramedullary nailing is a safe and effective method of managing distal tibial fracture.