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오주현,박지훈,강미정,정성철,Takeuchi Ichiro,정정현,이승훈 한국물리학회 2022 Current Applied Physics Vol.34 No.-
Alkaline earth (AE) metals are irreplaceable ingredients in the synthesis of AE metal-based antiperovskite oxides, and it can be achieved by a chemical reduction of a stable AE metal compound. In this study, hydrogen and carbothermal reduction of BaO and BaCO3 were attempted, and we here report an undesirable side reaction creating barium hydroxide (Ba(OH)2) as the product of the reaction with the small amount of water in ultra-high purity inert gas used in the reduction processes. Such side reaction pathways and products are hardly identifiable in a high-temperature reaction; yet, systematic investigations on phase evolutions using X-ray diffraction, IR spectroscopy, and thermogravimetric analysis enabled the detection of Ba(OH)2⋅xH2O. Unintentional creation of alkaline earth metal oxides in intermediate and subsequent hydration even under a negligible amount of H2O may lead to an unexpected loss of alkaline earth metal element and, consequently, its deficiency in a desired final product.
적심 및 Daminozide 처리가 가든멈 신품종 ‘Candy Ball’과 ‘Fancy Ball’의 생장 및 개화에 미치는 영향
오주현,민병훈,김동찬,김종윤 한국화훼학회 2015 화훼연구 Vol.23 No.3
This study was conducted to investigate the optimal number of pinching and daminozide spray application rates for a quality crop production of two newly bred garden mum cultivars (Chrysanthemum × morifolium ‘Candy Ball’ and ‘Fancy Ball’) from Floriculture Research Institute, Chungchungnam-do Agricultural Research & Extension Services, Yesan, Korea. To investigate the optimal number of pinching treatment, one-, two-, three-times pinching treatments were conducted one week after transplanting with 2 weeks intervals. Pinching treatments caused no considerable decrease in plant heights, but increased the number of flowers in both ‘Candy Ball’ and ‘Fancy Ball’ garden mum cultivars as the number of pinching increased, thus improving product quality. To find the optimal concentration of daminozide application for quality garden mum production, daminozide were sprayed three times at the concentration of 0, 1000, 2500, and 5000 mg • L−1. Both ‘Candy Ball’ and ‘Fancy Ball’ cultivars displayed shorter plant heights and peduncle lengths with increasing concentration of daminozide. Although flower sizes of both cultivars were not affected by daminozide treatment regardless of the concentration, ‘Fancy Ball’ cultivar displayed lighter red flower color with increasing daminozide concentration. In both cultivars the number of flowers increased with increasing daminozide concentration, which increased the total flower dry weight and shoot dry weight, thus improving the product quality. Overall, daminozide spray treatment with the concentration at 2500-5000 mg • L−1 was more effective than pinching treatment for the height and flowering control to improve product quality of the two newly bred garden mum cultivars ‘Candy Ball’ and ‘Fancy Ball’. 본 연구는 충청남도농업기술원 화훼연구소에서 새롭게 육성된 가든멈 신품종 Chrysanthemum × morifolium ‘Candy Ball’과 ‘Fancy Ball’의 고품질 생산을 위한 최적 적심 처리횟수와 식물생장조절제 daminozide 살포 최적 농도를 알아보고자 수행하였다. 적심 처리횟수를 정식 1주 후 2주 간격으로 1, 2, 3회 하였을때 ‘Candy Ball’과 ‘Fancy Ball’ 두 품종 모두 적심 처리에 의하여 초장이 크게 줄어들지는 않았으나 적심횟수가 많을수록 개화수가 증가하는 경향을 보여 생산 품질을 향상할 수 있을 것으로 판단되었다. Daminozide 처리 농도 실험에서는 0, 1000, 2500, 5000mg • L−1의 농도로 3회 엽면 살포시 두 품종 모두 daminozide 처리 농도가 증가함에 따라 초장과 화경장이 감소하였다. 두 품종 모두 daminozide 처리에 의한 꽃 크기 변화는 없었으나, ‘Fancy Ball’ 품종의 경우 daminozide 처리 농도가 높아질수록 붉은 화색이 옅어짐을 보였다. 두 품종 모두 daminozide 처리 농도가 증가함에 따라 개화수가 증가하는 결과로 전체 화기 건물중 및 지상부 건물중이 증가하여 가든멈 품질이 향상됨을 알 수 있었다. 결과적으로 가든멈 신품종 ‘Candy Ball’과‘Fancy Ball’의 고품질 생산을 위하여 단독 적심 처리보다는 2500-5000mg • L−1 농도의 daminozide 처리가 초장을 줄이고 개화수를 높이는데 효과적인 것으로 나타났다.
오주현,김미예,김범수 한국소비자정책교육학회 2023 소비자정책교육연구 Vol.19 No.3
Older adults are at risk of experiencing loneliness, which may result in adverse psychological outcomes and various social costs. Therefore, numerous studies have been conducted to explore effective strategies for managing loneliness by building social relationships directly. This study aims to present an indirect strategy for mitigating loneliness of older adults by employing AI speakers. We used a structural equation model with survey data from 448 AI speaker users who lived alone and were over 65 years old. The results revealed that the older adults’ AI speaker experience was positively associated with digital self-efficacy, which improved their life satisfaction. Furthermore, life satisfaction reduced loneliness. We explain this fully mediated path with the undo effect of positive emotions. The findings identified that loneliness can be alleviated indirectly by fostering cognitive processes through the development of psychological resources. We also discuss how emerging technology improves older adults’ psychological assets and well-being.
데이터 증강을 위한 클래스 활성화 맵 기반 Random Erasing
오주현,이규중 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.10
Random erasing offers various levels of occlusion for data augmentation. However, due to its uniform distribution of random selection, it sometimes occludes regions that are unrelated to the object of interest. In this paper, we propose a novel method that utilizes Gradient Weighted Class Activation Mapping (Grad-CAM) for estimating the location of the object of interest and selectively erasing the surrounding areas. By utilizing Grad-CAM, we improve random erasing for CNN models without requiring additional modules or architectural changes. We generate Grad-CAM after the intermediate epochs where CNN models have sufficient representational power for the training data. The hyperparameter that restrict the erasing to the vicinity of the object is set based on Grad-CAM, and experiments were conducted accordingly. As a result of our experiments, we observed a 0.33% decrease in error-rate for image classification tasks using ResNet-20 on the CIFAR-10 dataset.