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Practical operations for intermittent dual-layer slot coating processes
Jin Seok Park,Sanghun Jee,Byoungjin Chun,정현욱 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.3
Transient behaviors of dual-layered patches for Newtonian liquids were numerically investigated in dual-layer slot coating processes for the first time using step-changed inlet flows. To further tune the leading and trailing edges in a patch cycle, startup and end lag times between the top and bottom layers were proposed, considering the fl ow state of a bottom-layer liquid in a coating bead region. Carefully chosen lag times significantly reduced the defects in the leading and trailing edges of a dual-layered patch. It was also found that a greater coating layer viscosity results in a greater amount of residue left on the die lips, which affects the next patch cycle.
포인트 클라우드 데이터에서 클래스 불균형 해결을 위한 그룹별 학습 및 세그멘테이션 기법
성원준(Wonjun Seong),임희준(Hee Jun Lim),김상훈(Sanghun Kim),김지인(Jee-In Kim),김형석(HyungSeok Kim) 한국HCI학회 2021 한국HCI학회 학술대회 Vol.2021 No.1
본 논문은 3 차원 포인트 클라우드 도로 데이터를 딥러닝을 통해 시맨틱 세그멘테이션하는 것을 목표로 한다. 도로 데이터에서 각 객체가 포함하고 있는 점 개수의 차이에 따라 발생하는 클래스 불균형 문제를 해결하기 위해 장면 내에서 차지하는 비중이 많은 객체와 적은 객체를 나누어 학습하고 탐지하는 방법을 제안한다. 시맨틱 세그멘테이션 과정에서 점을 많이 차지하는 객체를 먼저 탐지하고 그것을 제외한 후에 남은 점들 중에서 점을 적게 차지하는 객체를 탐지한다. 레이블 노이즈를 줄이기 위해 각 단계 후에 포스트 프로세싱을 진행한다. 실험 결과 52.89%의 정확도를 보이며 이는 SemanticKITTI 데이터셋을 사용한 최신 연구결과들에 비해 높은 정확도를 보인다.
논 재배 팥 품종별 수량구성요소 및 에탄올 추출물의 항산화 성분 비교
전현정,정기열,최영대,이상훈,송석보,고지연,최지명,장윤우,Chun, Hyen Chung,Jung, Ki Yuol,Choi, Young Dae,Lee, Sanghun,Song, Seok bo,Ko, Jee Yeon,Choi, Ji Myung,Jang, Yun Woo 한국작물학회 2017 한국작물학회지 Vol.62 No.3
This study investigated the changes in yields, antioxidant compounds, and antioxidant activities among 11 adzuki bean cultivars cultivated in a paddy field with somewhat poorly drained soil. The adzuki bean cultivars were cultivated in the paddy field from 2015 to 2016 in Milyang, Gyeongsangnam, Korea. Average soil moisture content was 16.5% in 2015 and 31.0% in 2016 at the experimental site during adzuki bean cultivation. As the soil moisture content increased, most of the adzuki bean cultivars showed deceases in stem height, first setting pod node, number of pods, 100 seed weight, and yield. Chungju-pat produced the greatest yields among the 11 cultivars in 2015 and 2016, whereas Hongeon had the smallest yields. Adzuki bean yields after paddy field cultivation was lower for all cultivars than for adzuki bean yields from the same cultivars after upland field cultivation. Chungju-pat and Chilbo-pat showed the smallest decreases in yields after paddy field cultivation, whereas Hongeon and Kumsil showed the greatest yield reductions. There were no significant differences in proximate composition. Some mineral components ($P_2O_5$, Ca, and Mg) were statistically different across cultivars. Chungju-pat had the highest Ca and Mg contents, but antioxidant components (polyphenol and flavonoids) and antioxidant activities (ABTS and DPPH) were highest in Saegil and lowest in Jungbu-pat. PCA and clustering analyses, based on the growth, yield, and antioxidant component measurements, performed to identify which variables contributed the most to separating adzuki bean cultivars or to grouping cultivars with similar characteristics. These analyses showed that the antioxidant components and antioxidant activities had the most influence on grouping cultivars together. Among the 11 cultivars, Saegil was statistically different from the other cultivars, but the other 10 cultivars were not significantly different under paddy field cultivation. Soil moisture content affected adzuki bean yield and antioxidant component contents. An increase in soil moisture led to a decrease in yield, but an increase in antioxidant components. These results provide information that will improve the selection of an appropriate adzuki bean cultivar for use in paddy fields.