http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
입자추적 실험을 이용한 새만금 배수갑문 유출수의 영향 범위 연구
조창우(Chang Woo Cho),송용식(Yong Sik Song),방기영(Ki Young Bang) 한국해안해양공학회 2020 한국해안해양공학회 논문집 Vol.32 No.4
입자추적 실험 결과를 이용하여 새만금 배수갑문 유출수의 영향 범위 파악을 위한 방법론을 수립하고, 2017년을 대상으로 새만금 배수갑문 유출수의 영향 범위를 계절별 확률 분포로 제시하였다. 물질 수송 시간의 지표 중 하나인 water age를 계산하고 입자추적 실험 결과와 비교하여 계산 결과의 타당성을 입증하였다. 배수갑문 유출수는 신시 또는 가력 배수갑문을 중심으로 그 영향 범위가 방사형으로 증가하는데 계절풍의 영향으로 동계에는 남측으로, 하계에는 북측으로 영향 범위가 치우치는 것으로 예측되었다. 예측 결과는 2017년 상황에 한정되지만, 본 연구에서 수립한 입자추적 실험을 이용한 배수갑문 유출수 영향 범위 산정 기법은 현재 변화하고 있는 새만금 해역의 장래 배수갑문 유출수의 영향 범위 산정 연구에 활용이 가능하다. This study suggested a method calculating the influence of effluent discharge from Saemangeum sluice-gates using the particle tracking model. For 2017, we presented the seasonal effects of effluent discharge as probability spatial distributions and compared with the results of the water age, one of the indicators of transport time scale. The influence of sluice-gates effluent discharge increases radially around Sinshi or Gaseok gates, which are expected to be biased toward the south in winter and north in summer due to the effect of seasonal winds. Although the results of the prediction are limited to the 2017 situation, the method of calculating the influence of sluice-gates effluent discharge using the Lagrangian particle tracking model can be used to predict the future of the around Saemangeum.
빛간섭단층혈관조영술을 이용한 단안 정상안압녹내장에서의 망막모세혈관 분석
조창우(Chang Woo Cho),정우현(Woo Hyun Jung),김정림(Jung Lim Kim) 대한안과학회 2021 대한안과학회지 Vol.62 No.10
목적: 단안 정상안압녹내장 환자의 이환안 및 반대안과 정상 대조군에서 빛간섭단층혈관조영술을 이용, 망막모세혈관 인자를 분석, 비교했다. 대상과 방법: 단안 정상안압녹내장 이환안 및 반대안군 각 24안과 정상 대조군 29안의 시신경유두주변부, 황반부의 혈관밀도, 관류밀도를 빛간섭단층혈관조영술을 통해 측정, 분석했다. 결과: 표층모세혈관총에서, 정상안압녹내장의 반대안군에서 정상 대조군에 비해 황반부 내측 중 하측 영역 혈관밀도 및 내측 중 하측 영역, 외측 영역 평균 관류밀도 감소를 보였고(p=0.008, p<0.001, p=0.001), 이환안군은 반대안 및 정상 대조군보다 시신경유두주변부 전체, 내측 평균, 내측 중 하측, 외측 중 하측, 황반부 외측 중 하측 영역 혈관밀도(p=0.014, p=0.011, p<0.001, p<0.001, p<0.001) 및 관류밀도 감소(p=0.017, p=0.023, p<0.001, p=0.001, p<0.001), 시신경유두주변부 외측 평균 영역 혈관밀도 감소(p=0.010)를 보였으며, 정상 대조군보다 시신경유두주변부 외층 평균 영역 관류밀도 감소(p=0.003), 황반부 전체, 내측 중 하측, 외측 평균 영역 혈관밀도(p=0.041, p=0.008, p=0.006) 및 관류밀도 감소(p=0.013, p<0.001, p=0.001), 황반부 외측 중 이측 영역 관류밀도 감소(p=0.003)를 보였다. 황반부 심층모세혈관총의 유의한 차이는 없었다. 결론: 단안 정상안압녹내장 이환안 및 반대안에서 빛간섭단층혈관조영술을 이용한 망막모세혈관 인자의 확인이 유용할 것으로 생각된다. Purpose: The purpose of this study was to analyze retinal capillary parameters using optical coherence tomography angiography (OCTA) of the affected eye and the fellow eye of unilateral normal tension glaucoma (NTG) patients and compare the findings with eyes from a normal control group. Methods: A retrospective cross-sectional study was carried out on patients diagnosed with unilateral NTG (24 affected eyes and 24 fellow eyes each) and normal individuals (29 eyes, the control group). OCTA was used to measure the vascular density (VD) and perfusion density (PD) of the macular area and the peripapillary area. Results: In the superficial capillary plexus, the fellow eye group of unilateral NTG patients showed a decrease in VD of the inner-inferior and PD of the inner-inferior and outer-average peripapillary area, compared with the normal control group (p = 0.008, p < 0.001, and p = 0.001). In the affected NTG eye group, the VD (p = 0.014, p = 0.011, p < 0.001, p < 0.001, and p < 0.001) and PD (p = 0.017, p = 0.023, p < 0.001, p = 0.001, and p < 0.001) of the total, inner-average, inner-inferior, and outer-inferior peripapillary area, and the outer-inferior macular area decreased compared to the fellow eye and normal control group, as well as the VD of the outer-average peripapillary area (p = 0.010). The PD of the outer-average peripapillary area (p = 0.003); the VD (p = 0.041, p = 0.008, p = 0.006) and the PD (p = 0.013, p < 0.001, p = 0.001) of the total, inner-inferior, and outer-average macular area; and the PD of the outer-temporal macular area (p = 0.003) were lower than the normal control group. There was no difference in the VD or PD obtained from the deep capillary plexus of the macular area among the groups. Conclusions: It is useful to observe retinal capillary parameters using OCTA for patients with unilateral NTG. J Korean Ophthalmol Soc 2021;62(10):1397-1406
CNT/다공성 PDMS와 poly(ethylene oxide) 결합 기반의 웨어러블 자가 발전 압력 감지 소자
조창우(Changwoo Cho),이채은(Chaeeun Lee),오제훈(Je Hoon Oh) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
The development of technologies such as artificial intelligence and the Internet of Things has increased the demand for wearable self-powered pressure sensors. Triboelectric nanogenerator (TENG)-based self-powered pressure sensors have emerged as a solution to meet this demand. However, the measurement of static and small pressure ranges remains a challenge. In this paper, we propose a self-powered pressure sensing device based on the combination of carbon nanotube (CNT)/porous polydimethylsiloxane (PDMS) composite and poly(ethylene oxide) (PEO) film. The proposed device could continuously and reliably measure static and small-range pressure through capacitive pressure sensing while harvesting energy based on the triboelectric effect. The device exhibited a remarkable sensitivity of 1.37 ㎪-1, due to the incorporation of high-k materials (i.e., CNTs) in its porous structure and dielectric layer. It also had a power density of 15 ㎽/m² due to the triboelectric interaction between PDMS and PEO. Finally, the fabricated device was connected to a microcontroller unit to perform energy harvesting and pressure sensing simultaneously, demonstrating its great potential as a wearable device.
응집 및 Fenton 산화공정을 연계한 축산폐수처리에 관한 연구
조창우 ( Chang Woo Cho ),유재웅 ( Jae Woong Ryou ),정팔진 ( Paul Gene Chung ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.6
The objective of this study was to remove organics and color in livestock wastewater using coagulation and Fenton oxidation process. After coagulation process as 1^(st) treatment, organics in 1^(st) treatment water were removed by using OH radical produced in Fenton oxidation process. Removal efficiencies of COD_(Mn) and color were 87.2% and 95.7% separately. At that time, the ratio of Fe^(2+)/ H₂O₂ was 0.8∼1.0, and range of reaction pH was effective at the pH of 3.5∼3.8. The Reaction time of 120min more than 60min or 90min was sufficient in Fenton process. Removal efficiency of organics was higher two- or multi-stage treatment than one-stage treatment.