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        • KCI등재

          한국 노인에서 비만, 복부비만과 대사증후군의 유병률

          임주원,김소연,계소신,조비룡 대한가정의학회 2011 Korean Journal of Family Medicine Vol.32 No.2

          연구배경: 노인에서의 비만, 복부비만과 대사증후군의 유병률에 대한 추정은 국가보건정책과 임상진료에 중요한 자료이다. 그러나 국내 연구는 드물다. 본 연구는 65세 이상 노인에서비만, 복부비만과 대사증후군의 유병률을 추정하고 각 대사이상 요소의 유병률을 성별에 따라 분석하였다. 방법: 국민건강영양조사 제4기의 자료를 이용하였으며 65세이상의 노인을 분석대상으로 하였다. 사회 인구적 특성, 만성질환, 약물복용, 신체계측과 혈액검사 자료를 이용하였다결과: 여성 노인의 비만, 복부비만, 대사증후군의 유병률은 각각 46.9%, 56.3%, 46.7% (IDF 기준)였고, 남성 노인에서는 23.1%, 26.6%, 21.7% (IDF 기준)였다. 수정된 ATP III의 기준에 의한 대사증후군 유병률은 41.7% (남), 63.2% (여)였다. 여성 노인은 남성 노인에 비해 비만, 복부비만, 대사증후군모두에서 높은 유병률을 가지고 있었다(P<0.001). 개별 대사이상의 유병률에서 성별간 차이를 보인 것은 HDL-C이었다(P<0.001). 여성 노인은 HDL-C의 대사이상 유병률이 79.9%에달했다. 개별 대사 이상 중에서 비교적 높은 유병률을 보인 것은 혈압이상(남 63.1%, 여 69.4%)이었다. 결론: 우리나라 노인의 비만, 복부비만, 대사증후군의 유병률은 유럽과 미국에 비해 높았고, 여성 노인이 남성 노인에 비해더 높았으며, 최근 증가하고 있어 보건정책과 임상진료에 중요한 문제로 부각될 것이다. Background: The prevalence of obesity, abdominal obesity and metabolic syndrome is important for health policies and clinical practice. The aim of study is to estimate the prevalence of obesity, abdominal obesity and metabolic syndrome among older than 65 years in general population and identify the differences by gender. Additionally, we examined the prevalence of the abnormality of metabolic components by sex. Methods: We analyzed data from the Fourth Korea National Health and Nutrition Examination Survey (KNHANES IV)2007. The subjects of this study include persons over 65 years. We used data about demographics, chronic diseases,medications and blood laboratory results. Results: The prevalence of obesity, abdominal obesity and metabolic syndrome in elderly women was 46.9%, 56.3%and 46.7% (International Diabetes Federation [IDF] criteria) respectively. In elderly men, 23.1%, 26.6% and 21.7% (IDF criteria). The prevalence of metabolic syndrome by modified ATP III was 63.2% in elderly women and 41.7% in elderly men. The prevalence of these was significantly higher in women elderly other in men elderly (P < 0.001). The abnormality of HDL-C among the individual metabolic components was significantly higher in women elderly than in men elderly. The prevalence of HDL-C abnormality in women elderly reached 79.9%. Conclusion: The prevalence of obesity, abdominal obesity and metabolic syndrome was higher in Korea than US and Europe, and higher among women elderly than men elderly. Recent increase in prevalence of these might be a public health problem.

        • 2P-177 : Innovative Design of Two-Dimensional Plasmonic Interlayers for High-Efficient Organic Photovoltaic Cells

          임주원,오유린,주병권,김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          Plasmonic nanodots (PNDs) have been widely utilized for the develop-ment of high-performance organic photovoltaic (OPV) cells by ampli-fying light absorption at the active layer. In this study, a viable and promising optical engineering technique which enables the develop-ment of high-performance OPV was demonstrated. We elaborately control the size as well as the periodicity of the PNDs via laser inter-ference lithography which can induce the spectral overlap between the absorption of the organic semiconductors and the plasmon resonance of PNDs. As a result, PNDs arrays led to a remarkable enhancement in power conversion efficiency up to 10.61 % from 7.52 % compared with the control device. Near field enhancement and light scattering effect are responsible for the significantly improved device performance. Finite difference time domain simulation and external quantum efficiency results support the enhanced performance.

        • 1P-230: Plasmonic nanodot array via laser interference lithography for > 10 % efficiency organic photovoltaic cells

          임주원,( Yulin Oh ),( Jae Geun Kim ),( Young Wook Park ),( Heejun Kim ),( Yu Jin Jang ),( Jihyeon Kim ),( Byeong Kwon Ju ),김동하 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

          Metallic nanodots (MNDs) have been widely utilized for the development of high-performance organic photovoltaic (OPV) cells by amplifying light absorption at the active layer. In this study, promising optical engineering which enables the development of high-performance OPV was demonstrated. We elaborately control the size and periodicity of the MND arrays via laser interference lithography. The MND arrays can induce the spectral overlap between the absorption range of the organic semiconductors and the plasmon resonance of MNDs. As a results, MND arrays led to a remarkable enhancement in power conversion efficiency up to 10.55 % from 7.2 % compared with control device. Near field enhancement and light scattering effect are responsible for the significantly improved device performance.

        • 2P-175 : Dimensionality-Tailored Quasi-2D Perovskites for Highly Stable and Efficient Photodetectors

          임주원,( Huan Wang ),( Li Na Quan ),( Edward H. Sargent ),김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          In this work, we developed perovskite photodetector devices by integ-rating dimension-reduced (quasi-2D) perovskites instead of conven-tional three-dimensional counterparts. A series of quasi-2D perovskite films were synthesized to obtain advanced photodectors with improved stability while retaining the comparable electrical perform-ance of conventional three-dimensional perovskites. The quasi-2D perovskite photodetector exhibited a responsivity of 0.53 A/W and detectivity of 2.20ⅹ1012 J, which is attributed to decreased leakage current. In addition, the current density of quasi-2D perovskite photo-detector maintained 76 % while three-dimensional perovskite photodetector remained only 15 % of initial level after 2,000 hours. We confirm the stability of perovskite films via X-ray diffraction (XRD) and atomic force microscope (AFM) measurement.

        • KCI우수등재

          자기지도학습으로 추론된 특징을 이용한 CT 영상의 보간 방법

          임주원,박진아 한국정보과학회 2021 정보과학회논문지 Vol.48 No.9

          볼륨 데이터는 3차원 내부 정보를 가지고 있어서 정량적인 분석이 가능하다. 특히 의료영상 데이터는 인체 내부 구조를 3차원으로 시각화 할 수 있으나 이를 위해서는 균등한 복셀이 필요하다. 하지만 CT 데이터의 경우 방사선량을 줄이기 위해 슬라이스 이미지 사이의 간격이 넓은 볼륨 데이터를 얻는 경우가 있다. 이 경우, 3차원으로 재구성할 때 불연속적으로 시각화되거나 정량적인 오차를 유발할 수 있어 이미지 보간이 필요하게 된다. 본 논문에서는 고화질의 슬라이스 이미지로부터 CT 이미지 슬라이스 간의 보간에 필요한 정보를 자기지도학습으로 유추하는 방법을 제안하고자 한다. 이를 위하여 축소한 슬라이스 이미지를 신경망의 입력값으로 넣고, 신경망은 이 이미지를 원본 이미지로 복원하는 과정을 학습한다. 본 연구에서 제안하는 방법은 최근접 이웃 보간법과 삼선형 보간법보다 세부 정보를 유추하는 장점을 보이고 참값을 가지고 지도 학습으로 학습한 신경망 결과보다 성능이 저하되지 않음을 확인하였다. Since volumetric data includes internal information, it has an advantage of performing quantitative analysis. Especially medical image data render 3D structures of internal organs, and cubic voxel is necessary for accurate visualization. However, CT image volume is acquired in low z-resolution to reduce X-ray dose exposure. Between slices, image interpolation is a necessary step for visualization as well as for 3D data analysis. In this paper, we propose a self-supervised learning algorithm as an interpolation method that uses the information from the high-resolution images to infer missing information between slices. To achieve this, downscaled slice images are given as the input of the network, and the network recovers the original slice images from the downscaled images. The result of our method outperformed the commonly practiced interpolation methods - nearest-neighbor and trilinear interpolation – in the field, with respect to estimating details. Also, we verified that the proposed algorithm performs comparably with the supervised model with the same network.

        • 2P-176 : Interlayer-mediated Interface Engineering for High-Performance Flexible Perovskite Solar Cells

          임주원,김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

          Developing perovskite solar cells toward high-efficiency and low-tem-perature process has a great potential for the realization of next-generation renewable energy source. ZnO has attracted as promising electron transport layers (ETLs), however, perovskite is prone to easily decompose at the ZnO surface, resulting in the limited photovoltaic performance. Herein, we report interlayer-mediated efficient ETLs with one-step processed perovskite layer. Utilization of interlayer on ZnO prevents direct contact between the perovskite and ETLs, avoiding the destruction of perovskite materials. As a result, our perovskite solar cell employing tailor-designed ETL exhibits maximum power conversion efficiency (PCE) of 15.8 %, which is superior by 25 % higher than that of a control device (12.6 %). We further develop flexible solar cells which exhibit the PCE of 11.9 %. Our strategy paves the way to the realization of high performance, easy-to-process, and large-area perovskite opto-electronics.

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