http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서수종(Sujong Seo),정혜선(Heisawn Jeong) 한국HCI학회 2020 한국HCI학회 학술대회 Vol.2020 No.2
고령화 사회에 노인 교육이 시급한 문제로 떠올랐다. 기업은 ICT 기술을 활용하여 노인 돌봄 서비스를 진행하고 있지만 단편적인 대화, 단순한 기술 수행 정도의 상호작용 기능만 수행하고 있어 노인 돌봄 서비스에 다양한 컨텐츠와 그 효과성에 대한 연구가 요구된다. 인공지능 스피커를 활용한 선행 연구에서는 인공지능 스피커를 활용하여 외국어 학습 불안에 대한 감소 효과를 본 연구들이 있어 본 연구에서 노인 대상으로 비슷한 효과가 있는지 검증하고자 한다. 65 세 이상 노인 38 명을 대상으로 인공지능 스피커를 활용한 영어 단어 학습 연구를 참가자 내 설계로 진행하였다. 연구 결과 학습 방법에 대한 효과는 통계적으로 유의하지는 않았는데, 이는 기존 학령기 대상 연구와는 상반된 결과이다. 반면, 학습 방법과 학습 순서 간의 상호작용이 통계적으로 유의하게 나타났다. 이는 신기술에 대한 노인의 특성이 반영된 것으로 보이며, 향후 노인용 인공지능 스피커 학습 콘텐츠를 개발할 때 중요한 방향성을 제시해줄 것으로 예상된다.
Native Void Space for Maximum Volumetric Capacity in Silicon-Based Anodes
Yeom, Su Jeong,Lee, Cheolmin,Kang, Sujin,Wi, Tae-Ung,Lee, Chanhee,Chae, Sujong,Cho, Jaephil,Shin, Dong Ok,Ryu, Jungki,Lee, Hyun-Wook American Chemical Society 2019 NANO LETTERS Vol.19 No.12
<P>Volumetric energy density is considered a primary factor in developing high-energy batteries. Despite its significance, less efforts have been devoted to its improvement. Silicon-based materials have emerged as next-generation anodes for lithium-ion batteries due to their high specific capacity. However, their volumetric capacities are limited by the volume expansion rate of silicon, which restricts mass loading in the electrodes. To address this challenge, we introduce porous silicon templated from earth-abundant minerals with native internal voids, capable of alleviating volumetric expansion during repeated cycles. In situ transmission electron microscopy analysis allows the precise determination of the expansion rate of silicon, thus presenting an analytical model for finding the optimal content in silicon/graphite composites. The inner pores in silicon reduce problems associated with its expansion and allow higher silicon loading of 42% beyond the conventional limitations of 13-14%. Consequently, the anode designed in this work can deliver a volumetric capacity of 978 mAh cc<SUP>-1</SUP>. Thus, suppressing volume expansion with natural abundant template-assisted materials opens new avenues for cost-effective fabrication of high volumetric capacity batteries.</P> [FIG OMISSION]</BR>
Chang-Eui Park,Sujong Jeong 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
The growing season of temperate and boreal forests is lengthening as increasing global mean temperature. Examining the impact of growing season change on climate needs accurate estimation of surface temperature response to phenological changes in vegetation in spring and autumn. Here, biogeophysical sensitivity of surface temperature to earlier green-up in spring and delayed dormancy in autumn is investigated over the seasonal deciduous forests in the Northern Hemisphere by applying two resistance mechanism (TRM) method to experiments using Community land model version 5 (CLM5). Results show that both earlier leaf onset and delayed leaf senescence induce surface cooling according to the decrease in surface resistance, which increases surface latent heat release. However the cooling impact of earlier green-up is larger than that of delayed dormancy even for same change in date of leaf onset and leaf senescence. This asymmetric impact between same phenological change in spring and autumn is explained by different temperature sensitivity to aerodynamic resistance. The decrease in surface temperature according to reduced aerodynamic resistance is notable for earlier leaf onset, which strengthens the surface cooling in spring. In contrast, the delay in leaf senescence leads to slight impact of aerodynamic resistance on surface temperature. Results suggest that different response of surface temperature to aerodynamic resistance in spring and autumn season is one of keys to explain the asymmetric impact of earlier green-up and delayed dormancy on spring and autumn climate.