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비접촉 레이저 광센서의 성능 향상을 위한 센서보정에 관한 연구
서평원(Pyeong Won Seo),유영기(Young-Kee Ryu),오춘석(Choonsuk Oh),변종환(Jong-Hwan Byun) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
Flat panel image display devices such as TFT LCD and PDP have required more large area and high quality control components, To control the qualities of the components, measurements of the flatness of a plate glass has been required, In order to measure the shape of the specular objects. Non-Contact Optical Sensor using Hologram laser unit was proposed, The sensor has a optical system that is composed of a Hologram laser and objective lens, The temperature of the sensor body is controlled by TEC(Thermoelectric Cooler) to maintain the same wavelength of the diode laser. In this research, we proposed the calibration scheme to make sensor real time measuring sensor. From the experimental results we see that the proposed sensor unit can measure the position of the glass surface in real time.
오줌 유래 Trypsin 억제제가 출혈성쇼크에 미치는 영향
송동호(Dong Ho Song),조명행(Myung Haing Cho),김종민(Jong Min Kim),권오경(Oh Kyeong Kweon),이희천(Hee Chon Lee),정언승(Eon Seung Chung),양한석(Han Seok Yang),변종환(Jong Hwan Byun) 한국응용약물학회 1997 Biomolecules & Therapeutics(구 응용약물학회지) Vol.5 No.3
The protective effect of human urinary trypsin inhibitor(LTI) on acute hemorrhagic shock in beagle dog was studied. Hemorrhagic shock was experimentally induced in thoracotomized beagle dogs by removing blood and maintaining low arterial blood pressure for 30 min, and then blood removed was entirely transfused back into the dogs within one hour. When the blood was transfused, UTI was administered together to check the potential protective effect of UTI on hemorrhagic shock. The arterial blood pressure recovery was accelerated slightly by UTI treatment. Blood pH and P_aco₂ returned to normal level in shorter time in the UTI treatment group. These data suggest that UTI may have protective effects on experimentally induced hemorrhagic shock.
최형섭,조인철,변종환,문병현,허종수 한국환경농학회 2003 한국환경농학회지 Vol.22 No.1
호수 유입 하천인 황강의 1996~2001년 년도별 평균 수질은 COD 3.1~4,2 mg/L, T-N 2.460~3.550 mg/L, T-P 0.111~0.201 mg/L이였다. 호수내의 평균 수질은 COD가 1996년 1.9 mg/L에서 2001년 2.7 mg/L로 매년 조금씩 종가하는 것으로 나타났다. 호수내의 1996~2001년 년도별 평균 T-N 농도는 1.393~l.792 mg/L 이었으며, T-P농도는 0.018~0.023 mg/L 이였다. 식물성 플랑크톤의 발생 정도를 나타내는 Chl-α와 T-N, T-P와의 상관계수는 각각 0,382, 0.372였으며, 또한 수온과 강우량에 대한 상관계수는 각각 0.589, 0,526이였다. 따라서 합천댐의 경우 식물성 플랑크톤의 발생이 T-N, T-P보다 수온 및 강수량과 더 밀접한 관계가 있는 것으로 나타났다. 그리고 호수의 영양단계는 중영양~부영양 단계에 있는 것으로 평가되었다. The yearly average water qualifies of the Whang river, which flows into the Hapcheon lake, were COD 3.1~4.2 mg/L, T-N 2.460~3.550 mg/L, and T-P 0.111~0.201 mg/L during 1996~2001. The yearly average COD concentration of Hapcheon lake was increased from 1.9 mg/L (in 1996) to 2.7 mg/L (in 2000). However, T-N and T-P concentration of Hapcheon lake did not show increasing trend over the 6 year period. During 1996~2001, the yearly average concentrations of T-N, T-P were 1.383?1.792 mg/L, 0.018~0.023 mg/L, respectively. The correlation coefficients between chlorophyll α and T-N, T-P, rainfall intensity, water temperature were 0.382, 0372, 0.589, and 0.526, respectively. Therefore, the rainfall and water temperature appeared to play an important role for the variations of chlorophyll α concentration in the Hapcheon lake. Trophic state of the Hapcheon lake were evaluated to be in the range of mesotrophic to eutrophic.