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박수리(Suri Park),한상욱(Sang-wook Han),김병직(Byung-jick Kim) 한국가스학회 2017 한국가스학회지 Vol.21 No.5
화학플랜트 산업단지 내의 플랜지, 밸브 등의 이음새 및 저장탱크의 균열 등에서 발생되는 원료, 중간재, 제품가스의 누출 유무와 누출량을 확인하는 것은 안전 관점이나 경제적 관점에서 매우 중요하다. 광학가스이미지 기술은 누출 유무를 확인하는데 사용되고 있으나 누출량을 표시하지 않는다. 일부기기는 검출 가능한 가스에 대한 색상 구분과 농도에 따른 색상의 진함으로 나타내고 있다. 따라서 OGI영상에서 유출량의 정량화에 대한 연구가 필요하다. 본 실험적 연구는 광학가스이미지로 부터 유출량의 정량표시에 관한 것이다. 2 차원의 OGI영상으로 3 차원에 분포되어 있는 누출가스 양을 추정하기 위하여 몬테카를로 확률기법을 적용하였다. 산출면적 기준은 가로(2.54 ㎝), 세로(2.54 ㎝)의 2 차원의 OGI영상 점의 수에 대해 3 차원의 가스 분포 유출량과의 상관관계계수를 구하니 그 평균값이 0.980이었다. OGI영상의 이러한 데이터 표를 이용하여 역으로 유출량을 추정한 결과 유량계 측정값과 일치도가 높음을 확인했다. In chemical industry plants, the raw material, intermediate and final products can leak from unstable joints of flanges and valves as well as cracks of storage tanks. From the safety and economic standpoints, it is very important to understand whether leaks or not and leakage rate. The OGI(optical gas image) technique can tell gas leakages, but cannot give the leakage rate. Some special OGI devices can show the kind of gas in different color concentration in different darkness. Therefore the research on quantification of OGI is necessary. In this research, we have developed the practical method to quantify OGI of methane leakage. To estimate 3-dimensional gas leakages distribution from 2-dimensional OGI, the Monte Carlo Probability technique was applied. First the number of points in the area of width(2.54 ㎝) and length(2.54 ㎝) in OGI was counted. Total no of each experiment was compared with the measured flow rate. The correlation average between total points and measured flow rate was found to be 0.980. Reversely we estimated the leakage rate of OGI by use of the correlation table. The results showed good agreement between the estimation value and the measured value.
( Intan Fajar Suri ),( Byantara Darsan Purusatama ),( Jong Ho Kim ),( Go Un Yang ),( Denny Prasetia ),( Muhammad Alvin Savero ),( Se Yeong Park ),( Nam Hun Kim ) 한국목재공학회 2022 한국목재공학회 학술발표논문집 Vol.2022 No.1
This study aimed to evaluate the weathering properties of Paulownia tomentosa and Pinus koraiensis woods heat-treated in palm oil (OHT) and air (AHT) at 180℃, 200℃, and 220℃ for 2 hours. The untreated and heat-treated samples were exposed to UV and water for artificial weathering test according to ASTM G53-96. The artificial weathering test of heat-treated and untreated wood samples was performed by exposing to UV lamps in the QUV accelerated weathering tester (QUV/se Accelerated Weathering Tester, Q-LAB, USA) for 168 h and 336 h. The weathering cycle involved a continuous light irradiation of UV exposure for 2 hours and condensation for 2 hours. Color change and dimensional stability of the weathered samples were determined. Color change was measured by the CIEL*a*b* system (Esteves et al. 2008). Macroscopically, there was hardly shown on color difference in the wood samples before and after weathering. After weathering test, heat-treated wood of both species showed lower total color change than the control samples, and the total color change decreased with increasing treatment temperature. The total color change of OHT wood was smaller than that of AHT wood samples. In both species, the heat-treated wood samples showed higher dimensional stability than the control samples. The volumetric shrinkage of heat-treated wood samples decreased as the temperature increased. The OHT wood samples showed smallest volumetric shrinkage than AHT wood samples. In conclusion, after the weathering test, the OHT wood samples displayed better color and dimensional stability than the AHT wood samples.
이소성 골형성으로 인한 주관절 강직에서 12개월 이내에 시행한 수술적 치료의 효과
김용민(Yong-Min Kim),박지강(Ji-Kang Park),정수리(Suri Chong) 대한정형외과학회 2014 대한정형외과학회지 Vol.49 No.6
이소성 골형성으로 인해 주관절 운동 제한이 발생한 5예에 대해 1년 이내에 수술적 치료를 시행하였다. 수상 시로부터 평균 10개월에 수술적 치료로 이소성 골제거술 및 관절 유리술을 시행하였고 방사선 요법은 700 cGy로 1회 시행하였다. 비스테로이드성 소염제는 평균 4주간 사용하였다. 평균 21개월의 추적관찰 기간 중 이소성 골형성의 재발은 발생하지 않았다. 최종 추시에는 굴곡-신전 운동의 범위가 평균 64도에서 133도로 증가하였다. 이소성 골형성으로 인한 주관절의 운동제한이 발생한 경우 수상 시로부터 수술 시점은 기존에 제시되던 12-18개월보다 적은 1년 이내라도 방사선 치료 및 비스테로이드성 소염제를 동반한 수술적 치료로 효과적인 결과를 얻을 수 있었다. Five patients presented with a limited range of motion in their elbow associated with heterotopic ossification. All of these patients underwent surgery within one year. Removal of heterotopic ossification and a posterior capsular release was performed within ten months on average after the initial injury. Each patient postoperatively received prophylaxis consisting of a single-shot radiation of 700 cGY and administration of nonsteroidal anti-inflammatory drugs (NSAIDs) for four weeks on average. With a median follow up period of 21 months, five patients had no radiographic evidence of recurrence. The arc of flexion-extension increased from an average of 64 degrees preoperatively to 133 degrees at the latest follow up. A 12- to 18-month period is generally recommended as necessary for an operation on an ankylosed elbow associated with heterotopic ossification. However, the operative treatment, together with radiation therapy and NSAIDs administration, showed good results within 12 months.
비골 동맥 천공지 기저 프로펠러 피판술을 이용한 족관절 주위 연부조직 결손의 재건술: 4예 보고
조병기,박지강,박경진,정수리,Cho, Byung-Ki,Park, Ji-Kang,Park, Kyoung-Jin,Chong, Suri 대한족부족관절학회 2014 대한족부족관절학회지 Vol.18 No.4
Four patients with soft tissue defects around the ankle joint were covered with peroneal artery perforator-based propeller flaps. Using color Doppler sonography, the flap was designed by considering the location of the perforator and soft tissue defects. The procedure was then performed by rotating the flap by $180^{\circ}$. Additional skin graft was required in a patient due to partial necrosis, and delayed wound repair was performed in another patient with poor blood circulation at the distal part of the flap. The remaining patients did not have any complications and results were considered excellent. Good outcomes were eventually obtained for all patients.