• Journal of Community Nutrition
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• 제8권1호
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• pp.16-23
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• 2006

This paper describes a methodology for conducting Community Nutrition research with rather than on people in a community to generate grounded theory. This collaborative grounded theory methodology incorporates local knowledge and wisdom and builds community leadership capacity through engaging community-based professionals and para-professionals in the research process. In addition to building capacity for participation and leadership in research, education and action, this approach can increase the validity and value of the research and facilitate its application in community led programs. The methodology has five components: background, study design, data gathering, data analysis and interpretation, and application of findings in community programming. Three stages of the data analysis component focus sequentially on each interview independently, comparing across interviews, and systematically testing theory developed in the first two.

• 한국문헌정보학회지
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• 제35권2호
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• pp.23-40
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• 2001

디지털 기술은 정보의 생산, 저장, 배포를 위하여 사용된다. 본 연구에서는 기술적, 경제적, 국가적인 관점에서 디지털 아카이브의 현황을 조사하였으며 디지털 정보의 장기 보존과 관련된 배경과 이슈들에 관하여 분석하였다. 또한 본 연구에서는 디지털 아카이브의 선택, 구분, 보존, 관리 등의 구성 요소와 미래의 전망에 관하여 고찰하였다.

• 한국멀티미디어학회논문지
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• 제22권1호
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• pp.27-34
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• 2019

In this paper, a new type of lip feature is proposed as distance metric in CIELUV color system. The performance of the proposed feature was tested on face image database, Helen dataset from University of Illinois. The test processes consists of three steps. The first step is feature extraction and second step is principal component analysis for the optimal projection of a feature vector. The final step is Otsu's threshold for a two-class problem. The performance of the proposed feature was better than conventional features. Performance metrics for the evaluation are OverLap and Segmentation Error. Best performance for the proposed feature was OverLap of 65% and 59 % of segmentation error. Conventional methods shows 80~95% for OverLap and 5~15% of segmentation error usually. In conventional cases, the face database is well calibrated and adjusted with the same background and illumination for the scene. The Helen dataset used in this paper is not calibrated or adjusted at all. These images are gathered from internet and therefore, there are no calibration and adjustment.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제27권2호
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• pp.146-159
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• 2023

This paper proposes a hybrid algorithm combining K-means clustering and watershed algorithms for flower segmentation and counting. We use the K-means clustering algorithm to obtain the main colors in a complex background according to the cluster centers and then take a color space transformation to extract pixel values for the hue, saturation, and value of flower color. Next, we apply the threshold segmentation technique to segment flowers precisely and obtain the binary image of flowers. Based on this, we take the Euclidean distance transformation to obtain the distance map and apply it to find the local maxima of the connected components. Afterward, the proposed algorithm adaptively determines a minimum distance between each peak and apply it to label connected components using the watershed segmentation with eight-connectivity. On a dataset of 30 images, the test results reveal that the proposed method is more efficient and precise for the counting of overlapped flowers ignoring the degree of overlap, number of overlap, and relatively irregular shape.

• 천문학회보
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• 제45권1호
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• pp.37.2-37.2
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• 2020

We study the structures and dynamics of flows generated by ultra-relativistic jets on kpc scales through three-dimensional relativistic hydrodynamics (RHD) simulations. We employ a newly developed RHD code, equipped with the WENO-Z reconstruction, the SSPRK time discretization, and an equation of state that closely approximates the single-component perfect gas in relativistic regime. Exploring a set of models with various parameters, we confirm that the well-known Fanaroff-Riley dichotomy is primarily determined by the jet power, whereas the morphology of simulated jets also depends on the secondary parameters such as the momentum injection rate and the ratio of the jet to background pressure. Utilizing high resolution capabilities of the newly developed code, we examine in detail the dynamical properties of complex flows in different parts of jet-produced structures, and present the statistics of nonlinear dynamics such as shock, shear, and turbulence.

• 대한전자공학회논문지SP
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• 제47권1호
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• pp.9-16
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• 2010

이동 객체 검출은 입력 영상에서 배경과 다른 전경 객체를 찾는 것을 말하는 것으로 지능 영상 감시, HCI, 객체 기반 영상 압축 등의 여러 영상 처리 응용 분야에서 필요한 과정이다. 기존의 이동 객체 검출 알고리즘은 상당한 계산량을 요구하여 다채널 영상 감시 응용, 또는 임베디드 시스템에서의 단일 채널의 실시간 응용에 사용하는 데 애로가 많다. 보다 정확한 이동 객체 검출을 위하여 필요한 과정인 전경 마스크 정정은 보통 열림, 닫힘 등의 모폴로지 연산을 통해 수행된다. 모폴로지 연산은 계산량이 적지 않고 게다가 프로세싱 방법이 달라 이동 객체 검출의 다음 단계인 연결 요소 레이블링 루틴과 동시에 처리되기 어렵다. 본 논문에서는 먼저 모폴로지 연산과는 달리 연결 요소 레이블링 루틴에서 사용되는 주변 픽셀 점검 과정을 활용한 전경 마스크 정정 알고리즘인 "주변 전경 픽셀 전파"을 고안하고, 이를 활용하여 전경 마스크 정정과 연결 요소 레이블링이 동시에 수행될 수 있는 이동 객체 검출 방법을 제안한다. 실험을 통해, 제안된 이동 객체 검출 방법이 기존의 모폴로지 연산을 사용한 방법 보다 정확하게 이동 객체를 검출하였으며, 대상 실험 영상 프레임 및 비디오에 대해서는 최소 4배 이상 신속하게 처리됨을 확인하였다.

• Journal of Ginseng Research
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• 제46권2호
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• pp.235-247
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• 2022

Background: Ginsenoside Rg3 is one of the main active ingredients in ginseng. Here, we aimed to confirm its protective effect on the heart function in transverse aortic coarctation (TAC)-induced heart failure mice and explore the potential molecular mechanisms involved. Methods: The effects of ginsenoside Rg3 on heart and mitochondrial function were investigated by treating TAC-induced heart failure in mice. The mechanism of ginsenoside Rg3 for improving heart and mitochondrial function in mice with heart failure was predicted through integrative analysis of the proteome and plasma metabolome. Glucose uptake and myocardial insulin sensitivity were evaluated using micro-positron emission tomography. The effect of ginsenoside Rg3 on myocardial insulin sensitivity was clarified by combining in vivo animal experiments and in vitro cell experiments. Results: Treatment of TAC-induced mouse models with ginsenoside Rg3 significantly improved heart function and protected mitochondrial structure and function. Fusion of metabolomics, proteomics, and targeted metabolomics data showed that Rg3 regulated the glycolysis process, and Rg3 not only regulated glucose uptake but also improve myocardial insulin resistance. The molecular mechanism of ginsenoside Rg3 regulation of glucose metabolism was determined by exploring the interaction pathways of AMPK, insulin resistance, and glucose metabolism. The effect of ginsenoside Rg3 on the promotion of glucose uptake in IR-H9c2 cells by AMPK activation was dependent on the insulin signaling pathway. Conclusions: Ginsenoside Rg3 modulates glucose metabolism and significantly ameliorates insulin resistance through activation of the AMPK pathway.

• 보존과학회지
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• 제37권6호
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• pp.712-722
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• 2021

본 연구의 목적은 박락과 오염이 심하여 보존 상태가 좋지 않은 치성광여래 무신도에 대한 과학적 조사를 기초로 보존처리를 진행한 논문이다. 연구 방법으로는 상태 조사와 과학적 장비를 이용하여 무신도의 재질과 제작 방법을 파악하였다. 사용 장비로는 색차계와 실체현미경 그리고 휴대용 현미경, P-XRF, FT-IR, SEM-EDS를 이용하여 배접지와 바탕재의 종류와 채색 안료 성분분석을 하였다. 분석결과 배접지는 펄프지, 바탕재는 합성섬유인 폴리에스테르로 확인되었다. 또한 사용 안료는 적색 안료인 연단[Red Lead, Pb₃O₄], 백색 안료인 호분[Oyster Shell White, CaCO₃]을 제외하고 나머지는 합성안료로 확인되었다. 또한, 19세기 후반 무신도에서 주로 확인되는 녹색안료인 에메랄드그린[Emerald Green, Cu(C₂H₃O₂)₂·3Cu(AsO₂)₂]이 검출되었다. 이와 같은 분석을 통하여 확인된 재질 및 안료를 사용하여 치성광여래 무신도의 보존처리를 진행하여 보존하고자 하였다.

• 한국산학기술학회논문지
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• 제13권2호
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• pp.872-877
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• 2012

본 논문은 한글 모음의 구조적 특징을 이용하여 자연영상에 포함된 한글 문자영역을 검출하는 기법을 제안하였다. 자연 영상을 명도영상으로 변환하고 에지 및 연결요소 기반 방법으로 특징값을 추출하며, 추출된 특징값은 필터링을 수행하여 한글 문자의 특징에 맞지 않는 특징값을 제거하여 한글 문자영역 병합을 위한 후보를 선정한다. 선정된 후보 특징값은 한글 자소 병합 알고리즘으로 하나의 문자로 병합하여 후보 문자영역으로 검출하고, 한글 문자 유형 판별 알고리즘으로 한글 문자영역 여부를 판별함으로서 최종적인 한글 문자영역을 검출한다. 실험결과, 복잡한 배경을 갖고 다양한 환경에서 촬영된 영상에서 한글 문자영역을 효과적으로 검출하였고, 제안한 문자영역 검출 방법은 향상된 검출 결과를 보여 주었다.

• Journal of Ginseng Research
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• 제44권3호
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• pp.490-495
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• 2020

Background: Ginsenoside Rk1, a saponin component isolated from heat-processed Panax ginseng Meyer, has been implicated in the regulation of antitumor and anti-inflammatory activities. Although our previous studies have demonstrated that ginsenoside Rg3 significantly attenuated the activation of NMDA receptors (NMDARs) in hippocampal neurons, the effects of ginsenosides Rg5 and Rk1, which are derived from heat-mediated dehydration of ginsenoside Rg3, on neuronal NMDARs have not yet been elucidated. Methods: We examined the regulation of NMDARs by ginsenosides Rg5 and Rk1 in cultured rat hippocampal neurons using fura-2-based calcium imaging and whole-cell patch-clamp recordings. Results: The results from our investigation showed that ginsenosides Rg3 and Rg5 inhibited NMDARs with similar potencies. However, ginsenoside Rk1 inhibited NMDARs most effectively among the five compounds (Rg3, Rg5, Rk1, Rg5/Rk1 mixture, and protopanaxadiol) tested in cultured hippocampal neurons. Its inhibition is independent of the NMDA- and glycine-binding sites, and its action seems to involve in an interaction with the polyamine-binding site of the NMDAR channel complex. Conclusion: Taken together, our results suggest that ginsenoside Rk1 might be a novel component contributable to the development of ginseng-based therapeutic treatments for neurodegenerative diseases.