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윤길원,김홍식 대한의용생체공학회 1996 의공학회지 Vol.17 No.4
The development of a compact two-wavelength Nd:YAG laser for dental and ENT applications is presented. The Nd:YAG resonator generates either 1.06$\mu$m or 1.32$\mu$m. The wavelength selection is made at the control panel. The Nd:YAG laser parameters at 1.06$\mu$m are ; the maximum pulse duration of 150$\mu$s, repetition rates of I-100Hz, and the maximum average power of 25W. At 1.32$\mu$m, the pulse duration is the same where the repetition rates and the maximum average power are I-30Hz and lOW respectively. High voltage power supply consists of a simmer module and two identical high voltage DC converters. In order to make a complete medical laser system, an optical fiber delivery unit, foot pedal and water spray handpiece are also developed. The wavelength selection is reliable since no movement of optical or mechanical components is required. The high voltage power supply is compact, easy to be maintained and applicable for other laser systems due to its modular design.
윤길원,백승욱 대한기계학회 1988 대한기계학회논문집 Vol.12 No.1
본 연구에서는 공기중에 석탄 또는 곡식가루 등과 같은 고체미립자가 섞여있는 반응물에서의 화염전파에 관한 모델을 수립하여 고체미립자 농도 및 가루의 입자크기 변화에 따른 화염전파 속도와 예열거리를 예측한다. 이와 아울러 모델을 수립함에 있어 화염면으로부터의 복사열 전달에 의한 고체입자의 가열, 고체입자로부터의 대류와 화염면으로부터의 전도에 의한 가열과 같은 고체와 기체간의 상호 열전달 관계를 밝히며, 최종적으로 이상유동에서의 화염전파에서 가장 중요한 요인을 밝히는데 목적이 있다. A two phase model for the simulation of flame propagation has been developed and applied to a mixture of coal air. The effects associated with changes in the initial coal partial equivalence ratio and the initial diameter of particles on the structure of laminar flame propagation have been studied qualitatively and quantitatively. Especially the flame structure, the burning velocity, and the thermal behavior were evaluated. It was found that the radiative heat transfer absolutely dominates over the conduction mode. The increase in particle size was seen to contribute to an obvious increase in burning velocity for fuel lean and stoichiometric mixture. But for fuel rich mixture, the burning velocity was found to exhibit a weaker dependence on particle size.
Noninvasive Hematocrit Monitoring Based on Parameter-optimization of a LED Finger Probe
윤길원,Kye Jin Jeon 한국광학회 2005 Current Optics and Photonics Vol.9 No.3
An optical method of measuring hematocrit noninvasively is presented. An LED Light with multiple wavelengths was irradiated on fingernail and transmitted light from the finger was measured to predict hematocrit. A finger probe contained an LED array and detector. Our previous experience showed that prediction accuracy was sensitive to reliability of the finger probe hardware and we optimized the finger probe parameters such as the internal color, detector area and the emission area of a light source based on Design of Experiment. Using the optimized finger probe, we developed a hematocrit monitoring system and tested with 549 persons. For the calibration model with 368 persons, a regression coefficient of 0.74 and a standard deviation of 3.67 and the mean percent error of 8% were obtained. Hematocrits for 181 persons were predicted. We achieved a mean percent error of 8.2% where the regression coefficient was 0.68 and the standard deviation was 3.69.
윤길원 서울産業大學校 2005 논문집 Vol.54 No.3
맥박, 호흡, 산소포화도는 생명현상과 직결된 활력징후로 건강 상태를 알려주는 중요한 생체 신호이다. 기존의 측정 장비는 크고 사용하기가 불편하였으나 본 연구에서는 LED 센서를 이용하여 측정한 용적맥파로부터 맥박, 호흡, 산소포화도를 측정하는 방법을 연구하였다. 호흡에 의하여 흉부의 압력이 달라지고 따라서 말초혈관의 혈류량에 미세한 변화가 생기게 된다. 호흡신호는 맥파를 0.13-0.48Hz의 대역필터링을 통하여 얻을 수 있었다. 산소포화도는 660nm와 940nm의 두 파장의 흡수비를 이용하여 구하였다. 기존의 측정 장비와 정확성을 비교해 본 결과 모두 만족할 만한 결과를 얻을 수 있었다.