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김광택 ( Kwang Taek Kim ),조규정 ( Kyu Jung Cho ) 한국센서학회 2010 센서학회지 Vol.19 No.1
We have proposed and demonstrated a rotation angle sensor based on the stress -optic effect of a fused fiber coupler whose transmission spectrum is altered by the torsional stress. The peak of transmission spectrum was shifted to longer wavelength region with rotation of the coupler. The rotation angle sensor revealed reproducibility and symmetric behavior with respect to the rotation direction. The sensitivity of the sensor was 0.367 [nm/degree].
팔라듐이 코팅된 광섬유 격자를 이용한 절연유속의 용존 수소가스 검출
김광택 ( Kwang Taek Kim ),최누리 ( Nu Ri Choi ),백세종 ( Se-jong Baik ) 한국센서학회 2018 센서학회지 Vol.27 No.6
We have investigated a fiber-optic sensor for detecting the hydrogen gas dissolved in insulation oil based on a palladium (Pd)-coated fiber Bragg grating (FBG). As the palladium absorbs the hydrogen gas dissolved in the insulation oil, its volume expands and the Bragg wavelength shifts to a longer wavelength. The experimental results showed that the Bragg wavelength of FBG increased to 70 nm when the concentration of hydrogen dissolved in the insulation oil was 409 ppm.
클래딩이 있는 플라스틱 광섬유 테이퍼를 이용한 용액 굴절률 센서
김광택 ( Kwang Taek Kim ),김회만 ( Hoe Man Kim ),윤중현 ( Jung Hyun Yun ) 한국센서학회 2012 센서학회지 Vol.21 No.2
We have investigated a refractive index sensor based on a cladded plastic optical fiber taper. The optical transmission and sensing characteristics of the device were illuminated in terms of ray optics. The sensor devices showed that the optical transmittance strongly depends on the refractive index of the external medium surrounding the tapered region.
김광택(Kwang Taek Kim),김건표(Gunpyo Kim) 한국광학회 2023 한국광학회지 Vol.34 No.2
본 논문에서는 500 A용 bus bar에 적용할 수 있는 광섬유 브래그 격자를 이용한 전류 센서를 제안하여 실험으로 구현하였다. Bus bar와 영구자석을 광섬유 격자로 연결하여 전류 인가 시, 연결된 두 소자 사이에서 발생하는 자기력에 의해 광섬유 브래그 격자의 브래그 파장이 변하게 된다. 실험 결과 500 A 직류 전류를 인가 시 브래그 파장은 650 pm의 변화를 보였다. In this paper, a fiber-optic current sensor for a bus bar conductor based on the fiber Bragg grating (FBG) is proposed and demonstrated experimentally. The metal bus bar and a magnet are connected to each other through an FBG and the Bragg wavelength of the FBG is changed by magnetic force between the two connected devices. The experimental results showed that the Bragg wavelength of an FBG shifted by 650 pm as the 500 A direct current was applied to the bus bar.
측면 연마 편광 유지 광섬유와 평면 도파로 사이의 소산장 결합을 이용한 광센서
김광택 ( Kwang Taek Kim ),황보승 ( Sueng Hwangbo ),강용철 ( Yong Chul Kang ) 한국센서학회 2004 센서학회지 Vol.13 No.3
We have investigated the optical characteristics of a directional coupler made of a side-polished polarization maintaining fiber in contact with a multimode planar waveguide and its applications as sensors. A device structural condition to achieve the polarization insensitive wavelength response has been presented. The fabricated devices revealed a superior immunity to the bending and the deformation of PM fibers in the input section. It is experimentally shown that the proposed device is suitable for a remote fiber sensor.
한국형 인공심장 (AnyHeart)의 인체적용의 해부학적 적합성 평가
김태식(Tae Sik Kim),선 경(Kyung Sun),손호성(Ho Sung Son),김 현(Hyun Kim),박선화(Sun Hwa Park),김광택(Kwang Taek Kim),민병구(Byoung Goo Min),김형묵(Hyoung Mook Kim) 대한해부학회 2003 Anatomy & Cell Biology Vol.36 No.4
체내 이식형 의료장치들은 개발과정에서 임상적용전 사체실험(preclinical cadaver fitting test)을 실시하게 된다. 이를 통해 기계장치의 크기와 모양 및 구조 등이 인체 해부구조에 적합한지를 평가하고, 체내 이식에 적합한 최적의 위치를 결정하며, 임상에 적용가능한 수술술기를 완성할 수 있다. 저자들은 고려대학교 해부연구위원회의 승인을 받은 총 12구의 사체를 이용하여 자체 개발한 한국형 인공심장(AnyHeart)의 인체적용의 해부학적 적합성을 평가하였다. 관찰목표는 서로 다른 가슴안 접근법(복장뼈정중절개술, 오른쪽 개흉술, 왼쪽 개흉술, 복장뼈횡절개술)에서 인공심장의 적절한 이식 위치, 유입로와 유출로의 확보 및 도관의 삽입 위치 등이었다. 연구 결과 한국형 인공심장의 인체적용의 해부학적 적합성은 뛰어났으며, 특히 새로운 수술기법인 오른쪽 개흉술을 통한 인공심장 이식술을 가능하게 하였다. 본 연구를 통해 향후 본격적인 임상 시도의 토대를 마련하였고, 체내 이식형 의료장치의 개발과정에서 해부학적 적합성 평가의 중요성을 확인하였다. Preclinical cadaver fitting study is paramount in the development of various implantable medical devices. It helps to evaluate the fitness of the size, shape, structure of the devices in the human anatomy, to locate the most optimal site for implantation, and to develope the clinically available surgical techniques. The purpose of this study was to observe the anatomical feasibility of Korean artificial heart (AnyHeart) in 12 human cadavers after obtaining the permission from the Korea University Anatomical Research Committee. The observation was focused on proper position of the artificial heart in various thoracic incisions (median sternotomy, right thoracotomy, left thoracotomy, transsternal incision), localization of inflow as well and outflow tract, cannulation sites, and so on. Results showed that Korean artificial heart had excellent anatomical feasibility in the human body and that a novel surgical technique of right thoracotomy approach was proved to be clinically applicable. Conclusively, the above results will provide the rationales of clinical trial and demonstrate the significance of human cadaver study in development of implantable medical devices.
선경,백광제,김요한,임창영,김광택,김학제,김형묵,Sun, Kyung,Baek, Kwang-Je,Kim, Yo-Han,Kim, Chang-Young,Kim, Kwang-Taek,Kim, Hark-Jei,Kim, Hyoung-Mook 대한흉부심장혈관외과학회 1985 Journal of Chest Surgery (J Chest Surg) Vol.18 No.2
[here are so many reports that pulsatile blood flow provides physiologic organ perfusions during cardiopulmonary bypass. So, we compared the recent 30 cases undergoing cardiac surgery by Cobe-Stckert pulsatile roller pump with another 30 cases by Polystan nonpulsatile roller pump. Pulsatile flow was applied during aortic-cross clamping period when synchronized to internal EKG simulator, and perfusion mode was changed to continuous nonpulsatile flow after declamping of aorta. Age, sex, weight, and disease entities were comparable and operative techniques were similar between two groups. 1. There were no differences in average ACC time, ECC time, and Operation time. 2. Postoperative artificial respiration time was 6hrs 30mins in nonpulsatile group and 4hrs 48mins in pulsatile group, and detubation time after ventilator weaning was 2hrs 44mins in nonpulsatile group and 1hrs 43mins in pulsatile group. 3. Average pulse pressure was 8mmHg in nonpulsatile group and 55mmHg in pulsatile group, and a mean arterial pressure was 66.0mmHg in nonpulsatile group and 60.7mmHg in pulsatile group. 4. Mean urine-output during ACC;ECC period was 9.717.3;9.913.2ml/kg/hr in nonpulsatile group and 14.215.0;15.817.5 in pulsatile group [p<0, 05], and thereafter progressive decrease of differences in urine output between two groups until POD 2, and lesser amounts of diuretics was needed in pulsatile group during same postoperative period. Serum BUN/Cr level showed no specific difference and urine concentration power was well preserved in both groups. 5. Plasma proteins and other Enzymes showed no differences between two groups, but serum GOT/GPT level was higher in nonpulsatile group till POD 2. 6. Serum Electrolytes showed no differences between two groups. 7. WBC, RBC, Platelet counts, Hgb and Hct were not different and Coagulogram was well preserved in both groups. 8. Plasma free Hgb level was 7.09mg% in pulsatile group compared with 3.48mg% in pulsatile group on POD 1 but was normalized on POD 2. Gross hemoglobinuria after ECC was noted in 6 cases [20%] of pulsatile group and 4 cases [13%] of nonpulsatile group. 9. In both groups, most patients were included in NYHA class III to IV [28 cases;93% in nonpulsatile group, 22 cases;73% in pulsatile group] preoperatively, and well improved to class I to 11[22 cases; 73% in nonpulsatile group, 30 cases; 100% in pulsatile group] postoperatively. There were 7 operative mortalities in nonpulsatile group only, which were 5 cases of TOF with hepatic failure, 1 case of multiple VSDs with low out-put syndrome, and 1 case of mitral valvular heart disease with cardiomyopathy. We concluded that the new, commercially available Cobe-Stckert pulsatile roller pump device was safe, simple, and reliable.
측면 연마된 열확산 코어 광섬유와 외부 물질의 분산 특성 차이를 이용한 단파장 통과 필터
김광택,이규효,신은수,황보승,손경락,김정근,이동호,송재원,Kim, Kwang-Taek,Lee, Kyu-Hyo,Shin, Eun-Soo,Hwangbo, Seung,Sohn, Kyung-Rak,Kim, Jeong-Geun,Lee, Dong-Ho,Song, Jae-Won 한국광학회 2005 한국광학회지 Vol.16 No.6
코어가 확산된 단일모드 광섬유와 외부 물질 사이의 분산 특성의 차이를 이용하여 차단 특성이 우수한 단파장 통과 필터(short-pass filter)를 구현하였다. 두 물질의 결합 방법으로 측면 연마 기법을 도입하였다. 실험 결과 소자의 대역경계 파장(band edge wavelength)은 코어의 확산 정도로 조절이 가능하였다. 일반 통신용 단일 모드 대신에 열확산 코어 확산 광섬유를 도입함으로써 더 예리한 파장응답을 얻을 수 있었다. 열광학 효과를 이용하여 경계 파장을 400nm 이상 가변 할 수 있음을 관측하였다. We have demonstrated a fiber short-wavelength filter with a good cut-off property using dissimilar dispersive properties between? a thermally expanded cored fiber and an external medium. Side-polishing is applied to coupling between the fiber and the external medium. The experimental results revealed that the bend edge wavelength can be adjusted by controlling the degree of core expansion. Futhermore, the sharpness of wavelength response? was significantly? improved by employing expanded core fiber instead of a conventional single mode fiber. Tuning range of the band edge wavelength exceeded 400 m based on thermo-optic effect of the external medium.