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동물 분변으로 인한 모래 바닥재의 오염실태 및 관리 방안에 관한 연구 -질소분석방법개발-
정원구(Won-Gu Jeong),하영지(Ji-Young Ha),오근찬(Geun-Chan Oh),허인량(In-Ryang Huh),최승봉(Seung-Bong Choi) 한국환경보건학회 2020 한국환경보건학회지 Vol.46 No.6
Objectives: Users of parks or children’s play facilities have pointed to pets’ bowel movements as the most serious problem when using them. In prior studies, a very low detection rate of parasites (eggs) in sand flooring materials has been found. Even though feces have been identified, no parasites (eggs) have been detected. Method: A standard solution of nitrate nitrogen was used to verify the reliability of a new nitrogen analysis method. The linearity, precision, and accuracy of the nitrate nitrogen analysis method were verified. Using this method, the pollution distribution of the sand flooring material and the degree of pollution at each point were investigated. Results: As a result of the verification of the nitrogen analysis method, the linearity was found to be good at r2=0.999 when distilled water is mixed in a standard substance solution. The standard substance additive solution r2=0.968 was found to be good. Precision represented 0.01 to 0.06% RSD for peak height. The recovery rate was 92.4 to 104.0 percent, indicating high accuracy. According to the same method of analysis, the flooring material sand at a general amusement facility with the largest number of concealed spaces was nitrate nitrogen 6.1 times higher than at the entrance of the playground. Also, in a comparison between clean sand and sandy flooring, the average nitrogen concentration of the sand flooring material was 24.4-167 times higher than pure sand. Conclusions: As such, no parasites (eggs) were detected at all points under investigation, but the sand flooring was exposed to animal fecal contamination. Therefore, the management of nitrogenous components should allow accurate identification of animal fecal contamination so that the timing of sand replacement can be managed hygienically and safely.
유무연 용융도금 리본에 따른 결정질 실리콘 태양전지 모듈 열화거동
김주희,김아영,박노창,하정원,이상권,홍원식,Kim, Ju-Hee,Kim, A Yong,Park, Nochang,Ha, Jeong Won,Lee, Sang Guon,Hong, Won Sik 대한용접접합학회 2014 대한용접·접합학회지 Vol.32 No.6
Usage of heavy metal element (Pb, Hg and Cd etc.) in electronic devices have been restricted due to the environmental banning of the European Union, such as WEEE and RoHS. Therefore, it is needed to develop the Pb-free solder plated ribbon in photovoltaic (PV) module. This study described that degradation characteristics of PV module under damp heat (DH, $85^{\circ}C$ and 85% R.H.) condition test for 1,000 h. Solar cell ribbons were utilized to hot dipping plate with Pb-free solder alloys. Two types of Pb-free solder plated ribbons, Sn-3.0Ag-0.5Cu (SAC305) and Sn-48Bi-2Ag, and an electroless Sn-40Pb solder hot dipping plated ribbon as a reference sample were prepared to evaluate degradation characteristics. To detect the degradation of PV module with the eutectic and Pb-free solder plated ribbons, I-V curve, electro-luminescence (EL) and cross-sectional SEM analysis were carried out. DH test results show that the reason of maximum power (Pm) drop was mainly due to the decrease fill factor (FF). It was attributed to the crack or oxidation of interface between the cell and the ribbon. Among PV modules with the eutectic and Pb-free solder plated ribbon, the PV module with SAC305 ribbon relatively showed higher stability after DH test than the case of PV module with Sn-40Pb and Sn-48Bi-2Ag solder plated ribbons.
다중밴드 근적외선과 RGB의 상관관계를 이용한 색 항상성 기법
한동근(Dong-Keun Han),하정원(Jeong-Won Ha),김종옥(Jong-Ok Kim) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
The near-infrared(NIR) band has different characteristics from the visible band. In addition, since the NIR band(700~1000nm) is adjacent to the visible band(400~700nm), it is assumed that there exists correlation between NIR and visible bands. This paper proposes a novel deep method to exploit the correlation between RGB and NIR images for color constancy. The color constancy method aims at recognizing the original color of an object by estimating the value of illuminants. In the proposed color constancy method, a local illuminant and a confidence map are extracted through two sub-networks, respectively. And the global illuminant is estimated through the weighted sum of the local illuminant and the confidence map. Additionally, we conduct a transformer-based cross-attention to maximize the correlation between RGB and NIR images in a confidence map sub-network.