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        • 3P-242 : Realizing white light emitting organic-inorganic hybrid perovskite materials via Room temperature phosphorescence

          김다운,정인 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

          To obtain white light emission, it is important for material to emit light with wavelengths throughout the visible spectral region. In this presentation, we introduce aromatic cations to Ruddlesden-Popper type lead halide perovskite lattices to induce multiple emission from metal halide framework and conjugated cation. In their film samples, we observe photoluminescence spectra of which wavelengths extending a whole range of visible light. Emission spectra are narrower in a high energy region, and relatively broader in a low energy region. According to the photoluminescence lifetime measurement, the emission spectra with a large Stokes shift region show hundreds microsecond scale of decay lifetime. Accordingly, long lifetime emission spectra are attributed to phosphorescence process arising from the aromatic organic cations. We realized white light in single materials utilizing triplet energy transfer from metal halide framework to light emitting organic cation.

        • 단청 문양을 활용한 아트 메이크업 작품 제작

          김다운 한국메이크업디자인학회 2018 한국메이크업디자인학회지 Vol.14 No.2

          The aim of this study is to add visual value to dancheong after analyzing its images and colors and applying them to art makeup to show that this colorful Korean-style decorative pattern is useful in art makeup. The results found that dancheong provides a motif for new art makeup styling, and that it is applicable to diverse makeup styles. However, it is hard to represent exact traditional colors because colors are matched by using a brush. Furthermore, it is difficult to vividly express the realism of dancheong along the line of the 3-dimensional curve of a human body. As makeup emerges as a genre of formative art, it is a time to explore a new design realm. Under these circumstances, dancheong-based art makeup can be a valuable inspiration and stimulate attempts at diverse styles. In order for dancheong to move more deeply and fully into art makeup, it would be necessary to accept the positive aspects and correct and improve the less usable areas.

        • KCI등재

          Characterization of Nivalenol-Producing Fusarium culmorum Isolates Obtained from the Air at a Rice Paddy Field in Korea

          김다운,김기용,김희경,김주은,전순정,이철원,이향범,윤성환 한국식물병리학회 2016 Plant Pathology Journal Vol.32 No.3

          Together with the Fusarium graminearum species complex, F. culmorum is a major member of the caus-al agents of Fusarium head blight on cereals such as wheat, barley and corn. It causes significantyield and quality losses and results in the contamination of grain with mycotoxins that are harmful to humans and animals. In Korea, F. culmorum is listed as a quaran-tine fungal species since it has yet to be found in the country. In this paper, we report that two isolates (J1 and J2) of F. culmorum were collected from the air at a rice paddy field in Korea. Species identification was confirmed by phylogenetic analysis using multi-locus sequence data derived from fivegenes encoding translation elongation factor, histone H3, phosphate permease, a reductase, and an ammonia ligase and by morphological comparison with reference strains. Both diagnostic PCR and chemical analysis confirmedthat these F. culmorum isolates had the capacity to produce nivalenol, the trichothecene mycotoxin, in rice substrate. In addition, both isolates were patho-genic on wheat heads and corn stalks. This is the firstreport on the occurrence of F. culmorum in Korea.

        • 2P-210 : Topographical extracellular matrix cues on anticancer drug-induced cytotoxicity in stem cells

          김다운,김장호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          Micro- and nanofabrication techniques can be utilized to provide a set of mechanostimulatory signals to the cells that mimic the extracellular matrix (ECM). Here, we report periodic lateral topographic striations with an intention to mimic the ECM for investigating anticancer drug-induced cytotoxicity in stem cells. The ECM cues could facilitate perimeter, elongation, and gap junction formation of mesenchymal stem cells (MSCs), which eventually influenced the fate of cells. Interestingly, the appropriate inhibition of gap junctions of MSCs on the ECM mimicking substrates could prevent the cisplatin-induced cytotoxicity compared to that on the flat substrates. Our results imply that nanoscale topography is an important consideration, which uniquely enable the consideration and rational design of ECM-like topographic features. Furthermore, the natural topography of the ECM in the context of stem cell niches may serve as an important indicator for chemotherapeutic agent sensitivity.

        • 2P-211 : Hierarchically multipatterned topographical cues for stem cell therapy approaches

          김다운,김장호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          Bone tissue regeneration is one of the key challenges in biological applications. In this study, we approached a conceptual platform that can integrate stem cells into a multiscale patterned substrate for bone regeneration. Inspired by human bone tissue, we developed hierarchically micro- and nanopatterned transplantable patches using a poly(lactic-co-glycolic acid)(PLGA) polymer. The multiscale patterned PLGA patches were highly flexible and showed higher tissue adhesion. In response to the multiscale patterned topography, the adhesion and differentiation of human mesenchymal stem cells (hMSCs) were sensitively controlled. Furthermore, the prepared stem cell patches promoted bone regeneration when both the micro- and nanotopography were synergistically combined. Thus, our study concludes that multiscale patterned transplantable stem cell patches may have a great potential for bone regeneration as well as for various regenerative medicine approaches.

        • 2P-208 : Bio-inspired configurable multiscale extracellular matrix-like structures for functional alignment and guided orientation of cells

          김다운,김장호 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          Inspired by the hierarchically organized protein fibers in extracellular matrix (ECM) as well as the physiological importance of multiscale topography, we developed a simple method for the design and manipulation of precisely controllable multiscale hierarchical structures. In this study, we approached a conceptual platform that can mimic the hierarchically multi-scale topographical and orientation cues of the ECM for controlling cell structure and function. Using our platforms, the structures and orientations of fibroblast cells were greatly influenced by the nanotopography, rather than the micro-topography. We also proposed a new approach that enables the generation of native ECM having nanofibers in specific three-dimensional configurations by culturing fibroblast cells on the multi-scale substrata. We suggest that our methodology could be used as efficient strategies for the design and manipulation of various functional platforms for advanced regenerative medicine applications.

        • KCI등재

          RCP 시나리오 및 전지구 수문 모형을 활용한 아시아 미래 수문인자 예측

          김다운,김다은,강석구,최민하,Kim,,Dawun,Kim,,Daeun,Kang,,Seok-koo,Choi,,Minha 한국수자원학회 2016 한국수자원학회논문집 Vol.49 No.6

          According to the 4th and 5th assessment of the Intergovernmental Panel on Climate Change (IPCC), global climate has been rapidly changing because of the human activities since Industrial Revolution. The perceived changes were appeared strongly in temperature and concentration of carbon dioxide ($CO_2$). Global average temperature has increased about $0.74^{\circ}C$ over last 100 years (IPCC, 2007) and concentration of $CO_2$ is unprecedented in at least the last 800,000 years (IPCC, 2014). These phenomena influence precipitation, evapotranspiration and soil moisture which have an important role in hydrology, and that is the reason why there is a necessity to study climate change. In this study, Asia region was selected to simulate primary energy index from 1951 to 2100. To predict future climate change effect, Common Land Model (CLM) which is used for various fields across the world was employed. The forcing data was Representative Concentration Pathway (RCP) data which is the newest greenhouse gas emission scenario published in IPCC 5th assessment. Validation of net radiation ($R_n$), sensible heat flux (H), latent heat flux (LE) for historical period was performed with 5 flux tower site-data in the region of AsiaFlux and the monthly trends of simulation results were almost equaled to observation data. The simulation results for 2006-2100 showed almost stable net radiation, slightly decreasing sensible heat flux and quite increasing latent heat flux. Especially the uptrend for RCP 8.5 has been about doubled compared to RCP 4.5 and since late 2060s, variations of net radiation and sensible heat flux would be significantly risen becoming an extreme climate condition. In a follow-up study, a simulation for energy index and hydrological index under the detailed condition will be conducted with various scenario established from this study. 기후변화에 관한 정부간 협의체 (Intergovernmental Panel on Climate Change; IPCC)의 4차 및 5차 보고서에 따르면 인류 활동에 의한 기후변화가 산업혁명 이후 급속하게 진행되고 있다고 한다. 기후변화는 주로 온도와 이산화탄소 농도의 변화로 감지되는데, 지난 100여년 간 지구 평균 온도는 $0.74^{\circ}C$ 상승하였으며, 대기 중 이산화탄소의 농도는 최소 800,000년 동안의 최대치를 기록하였다 (IPCC, 2007, 2014). 이러한 기후 변화는 수문학 연구에서 중요한 강수, 증발산, 토양수분 등에도 커다란 영향을 미치므로 이에 대한 꾸준한 연구가 필요하다. 따라서 본 연구에서는 아시아 지역을 대상으로 1951년부터 2100년까지의 주요 에너지 인자들에 대한 모의를 실시하였다. 전 세계적으로 다양한 분야에서 사용되고 있는 Common Land Model을 미래 예측을 위한 기반으로 활용하였으며, 강제입력자료는 기후변화에 대응하기 위하여 IPCC 5차 보고서에 소개된 가장 최신의 온실가스 시나리오인 대표농도경로 (Representative Concentration Pathway; RCP)를 활용하였다. 과거 기간에 대한 순복사량, 현열 및 잠열에 대한 검증은 Asiaflux 사이트에 속한 5개 지점의 자료를 활용하여 수행하였으며, 모든 인자들에 대하여 모형의 월별 경향성이 관측 자료와 거의 일치함을 확인하였다. 미래 기간의 모의에 대해서는 RCP 4.5 및 RCP 8.5를 활용한 모의 모두 순복사량은 거의 변화가 없었으며 현열은 대체적으로 하강하는 경향을, 이와 대조적으로 잠열의 경우에는 상승하는 경향을 나타내었다. 특히 RCP 8.5를 활용한 결과에서 이 증감폭은 더 크게 나타났으며, 2060년대 후반부터 순복사량과 현열의 변동성이 매우 커지는 등의 극한기후의 특징을 나타내는 것으로 보인다. 추후 연구에서는 본 연구를 토대로 다양한 시나리오를 활용하여 더욱 다양한 조건하에서의 에너지 인자 및 다른 수문학적 주요 인자들에 대한 모의를 수행할 예정이다.

        • 단청 문양을 응용한 아트 메이크업 디자인

          김다운,김선형 한국메이크업디자인학회 2018 한국메이크업디자인학회지 Vol.14 No.1

          The aim of this study is to discover and use Korean traditional colors after applying the dancheong pattern (Korean-style colorful decorative patterns) to art makeup. In the first style ‘Yeonhwa', meoricho (a pattern placed at the end of each element) was simplified and applied to art makeup, making the colors of dancheong stand out. The second style ‘Maehwa' targeted the expression of the beauty and elegance of plum blossoms through lines and colors by picturizing them in byeoljihwa painting. The third style ‘Geummun' was created based on the consecutive features of silk patterns, emphasizing their geometric patterns and elegant colors. The fourth style ‘Hak' was expressed, taking the crane in the dancheong ceiling pattern as a motif. The crane's shape was simplified as a pair staring at each other. The above results confirmed that Korean dancheong patterns offer ideation and motifs for art makeup and is actually applicable. It is anticipated that the study results would be available as basic data for empirical case studies and that there would be continued studies on this matter.

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