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RISS 인기검색어
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- 저자 : 김우영(Woo Youg Kim) (검색결과 2 건)
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동슈아 ( Xuhua Dong ),김우영 ( Woo-youg Kim ),이경환 ( Kyeong-hwan Lee ) 한국농업기계학회 2022 한국농업기계학회 학술발표논문집 Vol.27 No.1
Pruning operations are necessary for the orchard management to control the apple tree vigor. Owing to the complicated structure of apple trees, the pruning severity can not be estimated quantitatively using any parameter. Therefore, it is necessary to solve the pruning severity estimation effectively to facilitate a better management of apple orchards. In this study, a novel technology for three-dimensional (3D) volume calculation of individual 3D tree was developed to define the pruning severity and make pruning severity mapping for the slender-spindle type of apple trees before and after pruning. The 3D point cloud of apple tree was reconstructed using multi-viewing images collected by a light-weight multi-camera system. The individual apple tree in 3D point cloud was extracted by CloudCompare software. The proposed volume calculation algorithm for apple tree was voxel-based and included interior filling, voxel edge thinning, and interior refilling. The proposed algorithm was experimentally tested on seven apple trees by comparing the tree volume using the proposed algorithm with those calculated using manual measurement, 3D convex hull, 3D alpha shape, concave hull by slices, and normal voxelization methods. The proposed method achieved the smallest mean absolute percentage (MAPE) of 5.6% with a coefficient of determination (R2) of 0.99. Finally, pruning severity mapping of all apple trees in the orchard were obtained. In this study, we proposed an effective method combining 3D photography and volume calculation to accurately estimate the volume of individual apple tree and quantificationally describe the pruning severity.
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조기양막파수 임신부에서 Dexamethasone 다회 투여가 임신부 및 신생아의 주산기 결과에 미치는 영향
김태중(Tae Joong Kim),김우영(Woo Youg Kim),유진경(Jin Kyung You),황종대(Jong Dae Whang),양순하(Soon Ha Yang),이제호(Je Ho Lee),노정래(Cheong Rae Roh) 대한산부인과학회 2000 Obstetrics & Gynecology Science Vol.43 No.9
목적 : 조기양막파수 임신부에서 산전 dexamethasone 투여가 신생아 호흡곤란증후군과 조기발생 신생아 패혈증 및 융모양막염에 미치는 영향을 알아보고자 하였다.연구 대상 및 방법 : 임신 24주에서34주 사이의 조기양막파수로 삼성서울병원에 입원한 임신부를 대상으로 후향적 연구를 시행하였다. 연구 대상 산모를 dexamethasone 투여횟수에 따라 세 군으로 분류하였다 : (1) 산전 dexamethasone 을 투여받지 않은 군 (대조군) (2) 5mg dexamethasone 4회를 12시간 간격으로 근주 또는 정주 투여받은 군 (1회 요법) (3) 초기 1회 요법이 끝난 후 1주 간격으로 dexamethasone 추가 투여받은 군 (다회 요법). 모든 산모들은 예방적 항생제를 투여받았다. 불연속 변량은 Chi-squre test, 연속 변량은 analysis of variance를 통해 세 군간의 차이를 검정하였다. 교란변수의 영향을 보정하기 위해 다중 로지스틱 회귀분석(multiple logistic regression analysis)을 사용하였는데 조기발생 신생아 패혈증 및 융모양막염의 위험인자로 여겨지는 변수들을 독립변수로 조기발생 신생아 패혈증와 융모양막염을 각각 종속변수로 삼아 통계분석을 하였다. P<0.05 이면 통계적으로 유의하다고 간주하였다.결과 : 129명의 조기양막파수 임신부가 연구대상에 포함되었는데, 대조군 37명, 일회 요법군 68명, 다회 요법군 24명이었다. 신생아 호흡곤란증후군과 융모양막염 및 조기발생 신생아 패혈증의 발생 빈도는 산전 dexamethasone 투여횟수와 상관성이 없었다.결론 : 조기양막파수에서 산전 dexamethasone 투여횟수에 따라 신생아 호흡곤란증후군이 감소되거나 신생아 및 모체 감염이 증가되지 않는다. Objective : To determine the effect of antenatal dexamethasone exposure on the incidence of neonatal respiratory distress syndrome (RDS), early-onset neonatal sepsis and maternal chorioamnionitis in patients with preterm premature rupture of membranes.Methods : We performed a retrospective analysis of mothers admitted between 24 and 34 weeks' gestation after preterm premature rupture of membranes. Patients with preterm premature rupture of membranes were categorized into 3 groups on the basis of the following dexamethasone exposures: (1) none (control subjects), (2) four 5-mg doses in a 12-hour interval on admission (single course), and (3) weekly administration after the initial single course (multiple courses). All included patients received prophylactic antibiotics. Discrete data were tested for significance with the x2 test. Continuous data were tested for significance with an analysis of variance. Multiple logistic regression analysis was performed to determine the confounding effect of the multiple variables that were considered as risk factors for early-onset neonatal sepsis and maternal chorioamnionitis. All P value of <.05 were considered significant. Results : One hundred twenty nine patients with preterm premature rupture of membranes were included, 37 of whom were evaluated in the control group, 68 in the single-course group, and 24 in the group receiving multiple courses of dexamethasone. The incidence of neonatal RDS, chorioamnionitis and early-onset neonatal sepsis were not associated with the number of antenatal dexamethasone exposures.Conclusions : Multiple courses of antenatal dexamethasone administered to patients with preterm premature rupture of membranes is not associated with a decreased risk of neonatal RDS and an increased risk of early-onset neonatal sepsis and maternal chorioamnionitis.
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