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Hong Seungyeon,Lee Sung Hun,Lee Kyung Min,Yum Jun-Ho,Seo Ji-Youn,Kim Hyo Jung 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.4
Defect passivation is an efcient strategy for improving the performance of perovskite solar cells (PSCs). In this study, we introduced a benzodithiophene-based 2D spacer with a short alkyl chain (BDT-C2) into a perovskite flm for defect passivation. The introduction of BDT-C2 did not exhibit the 2D perovskite structure, but an optimized amount (0.01 wt%) induced vertically oriented (110) planes of perovskite flm. However, when excess BDT-C2 was added to the perovskite flm, the orientation collapsed. The nanostructure of the flm was correlated with the device performance. The (110) plane was mostly arranged in the vertical orientation, and the device performance was best under the optimal conditions. Despite the enhancement of the device performance, the grain size of the perovskite was almost unaltered with the addition of BDT-C2. By measuring the light intensity-dependent Voc and Jsc, we confrmed that there was reduced charge recombination owing to defect passivation under the optimal conditions.
홍승연(Seungyeon Hong) 한국상고사학회 2024 한국상고사학보 Vol.123 No.123
본고는 백제가 웅진으로 천도한 후 고구려가 어떠한 방식으로 몽촌토성을 점유하였는지 알아보 기 위해 작성되었다. 몽촌토성은 한성기 백제의 중심지로 활용되었으나, 고구려의 남진정책 하에 서 고구려군의 중부지방 지배를 위한 군사 거점으로 기능했다고 알려졌다. 최근 서울대학교박물관 의 1980년대 발굴조사 재보고 성과와 한성백제박물관의 북문지 권역 발굴조사 결과를 바탕으로 고구려의 몽촌토성 내부 점유 양상을 구체적으로 규명할 수 있었다. 고구려의 몽촌토성 점유 양상을 파악하기 위해 몽촌토성 동남·서남지구에서 토기 밀도의 공간 분포를 살펴본 후, 유물과 유구의 세부 현황을 검토하였다. 그 결과 고구려는 백제의 주요 시설 일부를 선택적으로 재활용함과 동시에 일부 공간을 새롭게 개발했던 것으로 보인다. 일례로 백제 의 원통형·플라스크형 저장공을 재활용에 동물뼈나 철제 무기, 토기 등을 매납한 정황이 파악된다. 또한, 몽촌토성 내에 공간을 구획하고 도로, 집수지, 건물지, 저장시설 등을 다양하게 조성한 양상은 고구려의 전략적 점유 계획을 암시한다. 남쪽 고지대와 북문지 일원에서 출토된 철제 무기 류와 농기구를 통해 주둔 기간동안의 농사 및 군사 활동을 추정해볼 수 있으며, 취사·배식용 토 기와 더불어 원통형삼족기·광구장경사이옹 등 특수 토기 기종도 함께 활용했음을 알 수 있다. 고구려는 남진을 위한 거점으로 몽촌토성을 전략적으로 개발하며 장기간 주둔하였다. 고구려군 이 몽촌토성을 사용한 주요 시간대를 파악하고자 성내 고구려 수혈과 도로에서 얻어진 방사성탄소 연대 측정치를 검토하였다. 그 결과 고구려는 5세기 후반부터 6세기 중반에 이르기까지 몽촌토성 을 점유했을 가능성이 크며, 일정 기간동안은 인접한 한강 유역 보루군과 함께 남진정책을 위한 주요 군사 거점으로 기능했던 것으로 보인다. This paper aims to examine the processs of regeneration of Mongchontoseong by Goguryeo, following Baekje’s relocation of its capital to Ungjin. Drawing upon the artifacts from 1980s excavation and the recent fieldwork findings, this study explores the spatial and temporal reorganization in the Mongchontoseong after 5th century AD. The spatial distribution of the pottery from the southern part of the inner Mongchontoseong site was first explored. Goguryeo strategically reused places previously built by Baekje, including storage, ponds, and pits, and also altered the built environment. The features, iron weapons, farming tools, and pottery type also reveal the diverse aspects of the long-term occupation of Goguryeo, taking the roles of domestic housing, rituals, agricultural activities, and storage. The radiocarbon dating results from the pits and roadways show Goguryeo’s active engagement in infrastructure reconstruction from the late 5th century to the middle of the 6th century, predating the reoccupation by the allied forces of Baekje and Silla in 550 AD. The material evidence reveals Goguryeo’s prolonged regeneration of the site for the southward expansion, as sociopolitical strategies in the context of warfare in the Korean Peninsula during 5-6th century AD.
A magnetic polyaniline nanohybrid for MR imaging and redox sensing of cancer cells
Hong, Yoochan,Hwang, Seungyeon,Heo, Dan,Kim, Bongjune,Ku, Minhee,Lee, Eugene,Haam, Seungjoo,Yoon, Dae Sung,Yang, Jaemoon,Suh, Jin-Suck The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.5
<P>A synthetic process for constructing an organo-metal nanohybrid is described. This process uses polyaniline as a ligand in order to fabricate magnetic nanoparticles. This nanohybrid shows imaging potential uses as a magnetic resonance imaging contrast agent and a redox-sensing probe simultaneously both in vitro and in vivo.</P>
Hong, Yongsik,Kim, Euijoo,Lee, Eungpill,Lee, Seungyeon,Cho, Kyutae,Lee, Youngkeun,Chung, Sanghoon,Jeong, Heonmo,You, Younghan The Ecological Society of Korea 2019 Journal of Ecology and Environment Vol.43 No.4
Background: To investigate the trends of succession occurring at the Pinus thunbergii forests on the lowlands of Jeju Island, we quantified the species compositions and the importance values by vegetation layers of Braun-Blanquet method on the Pinus thunbergii forests. We used multivariate analysis technique to know the correlations between the vegetation group types and the location environmental factors; we used the location environment factors such as altitudes above sea level, tidal winds (distance from the coast), annual average temperatures, and forest gaps to know the vegetation distribution patterns. Results: According to the results on the lowland of Jeju Island, the understory vegetation of the lowland Pinus thunbergii forests was dominated by tall evergreen broad-leaved trees such as Machilus thunbergii, Neolitsea sericea, and Cinnamomum japonicum showing a vegetation group structure of the mid-succession, and the distribution patterns of vegetation were determined by the altitudes above sea level, the tidal winds on the distance from the coast, the annual average temperatures, and the forest gaps. We could discriminate the secondary succession characteristics of the Pinus thunbergii forests on the lowland and highland of Jeju Island of South Korea. Conclusions: In the lowland of Jeju Island, the secondary succession will progress to the form of Pinus thunbergii (early successional species)→Machilus thunbergii, Litsea japonica (mid-successional species)→Machilus thunbergii (late-successional species) sequence in the temperate areas with strong tidal winds. In the highland of Jeju Island, the succession will progress to the form of Pinus thunbergii (early successional species)→Neolitsea sericea, Eurya japonica (mid-successional species)→Castanopsis sieboldii (late-successional species) sequence in the areas where tidal winds are weak and temperatures are relatively low. However, local differences between lowland and highland of Jeju Island will be caused by the micro-environmental factors resulting from the topographic differences and the supply of tree seeds. From the characteristics of succession study, we could properly predict and manage the Pinus thunbergii forest ecosystem on lowland and highland of Jeju Island.
김원,Seungyeon Kim,정재승,이경욱,안국진,정용안,Keun-Young Hong,채정호 대한신경정신의학회 2009 PSYCHIATRY INVESTIGATION Vol.6 No.1
Objective: Previous neuroimaging studies on romantic love have focused on determining how the visual stimuli that serve as a representation of loved ones induce the neural activation patterns of romantic love. The purpose of this study was to investigate the temporal changes in romantic love over a period of 6 months and their correlated neurophysiological changes. Methods: Five heterosexual couples (n=10, mean age 21.1±1.97) who started dating not less than 100 days previously were recruited to measure their blood oxygen level dependent (BOLD) signals using functional magnetic resonance imaging (fMRI) while showing them pictures of their loved ones and their previously identified, opposite-sex friends. Subsequently, the subjects were scanned under the same experimental conditions to assess possible changes in their brain activities after 180 days. Results: We found that their Passionate Love Score (PLS) values (M: 118.6±9.1, F: 120.2 ±7.0) were significantly reduced after 6 months (M: 110.8±4.0, F: 106.2±3.0). Furthermore, significantly increased activations were found in the cingulate gyri, inferior frontal gyri, supramarginal gyri, etc., after 6 months, whereas the head and tail of the right caudate nucleus were deactivated, which is indicative of the inhibition of expression and sensory neglect. Conclusion: These findings suggest that dynamic neural processes in the cortical-subcortical regions are involved in temporal changes in romantic love.
신승연(Seungyeon Shin),홍성민(Sungmin Hong),박상현(Sanghyun Park),윤일동(Il Dong Yun),이상욱(Sang Uk Lee) 한국방송·미디어공학회 2012 한국방송공학회 학술발표대회 논문집 Vol.2012 No.7
본 논문에서는 의료영상 영역화 기법으로 이용되는 레이블 융합 기법을 기반으로, 정합 기법을 이용했을 시 빈번하게 발생하는 경계에서의 오차를 크게 줄여줄 수 있는 기법을 제안한다. 패치 기반 레이블 융합 기법은 패치 간의 밝기 값의 유사도를 기반으로 융합 가중치를 계산하였지만 이는 밝기의 분포가 상대적으로 다른 자기공명영상에 적합하지 못한 경우가 많았다. 본 논문에서는 밝기 값과 함께 밝기 값의 경사도 유사도를 추가적으로 계산하여 융합 가중치를 얻어내는 기법을 제안한다. 밝기의 분포가 다른 영역에서도 밝기의 경사도 분포는 대부분 유사하기 때문에, 오차가 많은 모호한 경계에서 향상된 결과를 얻을 수 있었다. 제안하는 기법의 성능평가를 위해 50 개의 SKI10 무릎 관절 데이터 셋 내에서 대퇴골을 영역화 하였다. 실험 결과를 통해 제안하는 기법이 밝기 값 유사도 정보만을 이용했던 기법에 비해 개선된 성능을 보이고 있음을 확인할 수 있다.