다중 스태킹을 가진 새로운 앙상블 학습 기법

이수은(Su-eun Lee),김한준(Han-joon Kim) 한국전자거래학회 2020 한국전자거래학회지 Vol.25 No.3

기계학습(machine learning)이란 주어진 데이터에 대한 일반화 과정으로부터 특정 문제를 해결할 수 있는 모델(model) 생성 기술을 의미한다. 우수한 성능의 모델을 생성하기 위해서는 양질의 학습데이터와 일반화 과정을 위한 학습 알고리즘이 준비되어야 한다. 성능 개선을 위한 한 가지 방법으로서 앙상블(Ensemble) 기법은 단일 모델(single model)을 생성하기보다 다중모델을 생성하며, 이는 배깅(Bagging), 부스팅(Boosting), 스태킹(Stacking) 학습 기법을 포함한다. 본 논문은 기존 스태킹 기법을 개선한 다중 스태킹 앙상블(Multiple Stacking Ensemble) 학습기법을 제안한다. 다중 스태킹 앙상블 기법의 학습 구조는 딥러닝 구조와 유사하고 각 레이어가 스태킹 모델의 조합으로 구성되며 계층의 수를 증가시켜 각 계층의 오분류율을 최소화하여 성능을 개선한다. 4가지 유형의 데이터셋을 이용한 실험을 통해 제안 기법이 기존 기법에 비해 분류 성능이 우수함을 보인다. Machine learning refers to a model generation technique that can solve specific problems from the generalization process for given data. In order to generate a high performance model, high quality training data and learning algorithms for generalization process should be prepared. As one way of improving the performance of model to be learned, the Ensemble technique generates multiple models rather than a single model, which includes bagging, boosting, and stacking learning techniques. This paper proposes a new Ensemble technique with multiple stacking that outperforms the conventional stacking technique. The learning structure of multiple stacking ensemble technique is similar to the structure of deep learning, in which each layer is composed of a combination of stacking models, and the number of layers get increased so as to minimize the misclassification rate of each layer. Through experiments using four types of datasets, we have showed that the proposed method outperforms the exiting ones.

알루미늄-마그네슘 이종금속 판재의 계면 연계 물성에 미치는 열처리의 영향

이수은 ( Su Eun Lee ),이광석 ( Kwang Seok Lee ),김민중 ( Min Jung Kim ),권용남 ( Yong Nam Kwon ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.8

"Abstract: The influence of annealing treatment on the interface-correlated microstructural evolution and subsequent mechanical properties of an Al1050/AZ31B clad sheet was systematically investigated. A scanning electron microscope with an attached energy dispersive spectroscopy revealed that diffusive layer consisted of γ (Mg17Al12), and β (Mg2Al3) phases was generated and grown with increasing annealing time and temperature. Mechanical properties were evaluated by uniaxial tensile and peel tests. Improvement of bonding strength between Al1050 and AZ31B by feasible annealing seemed to be strongly related to the generation of metallurgical bonding by a diffusive intermetallic compound layer whose overall thickness was limited to below 1.4 μm."

합성곱 신경망과 설명 가능한 인공지능을 활용한 실시간 자세 판별 시스템

이수은(Su-Eun Lee),배재우(Jae-U Bae),신다민(Da-Min Shin),이진수(Jin-Su Lee),박나윤(Na-Yun Park),김형남(Hyoung-Nam Kim) 한국통신학회 2023 한국통신학회 인공지능 학술대회 논문집 Vol.2023 No.9

대나무를 이용한 직물의 천연염색

이수은(Su Eun Lee),우효정 (Hyo Jeong Woo),정고은(Go Eun Jeong),이정순(Jung Soon Lee) 한국생활과학회 2009 한국생활과학회 학술대회 Vol.2009 No.하계

신이식 환자에서 발생한 결핵에 의한 혈구탐식 증후군 (Hemophagocytic Syndrome)

유수은 ( Su Eun Yu ),김형욱 ( Hyung Wook Kim ),신영신 ( Young Shin Shin ),김혜수 ( Hye Soo Kim ),이종민 ( Jong Min Lee ),김희정 ( Hee Jung Kim ),김석영 ( Suk Young Kim ),방병기 ( Byung Kee Bang ) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.6

Hemophagocytic syndrome is a rare syndrome characterized by fever, weight loss, profound pancytopenia, lymphadenopathy, hepatosplenomegaly and the pathologic finding of hemophagocytosis (phagocytosis by macrophages of erythrocytes, leukocytes, platelets, and their precursors) in bone marrow and other tissue. This syndrome can be associated with viral infections and lymphoid neoplasia, bacteria, fungus and drugs. Hyperproduction of cytokines, including interferon-γ, tumor necrosis factor-α, may play a role in the pathogenesis of hemophagocytosis. Authors experienced a rare case of bemophagocytic syndrome associated with tuberculosis in a 40-year-old female who had undergone renal transplantation 12 years ago and received triple immunotherapy. After the beginning of antituberculosis therapy, the laboratory disturbances disappeared and clinical symptoms improved. Tuberculosis is a common infection in Korea. Therefore, we would like to recommend early bone marrow biopsy and antituberculosis therapy if fever of unknown origin, hepatosplenomegaly and pancytopenia in immunosupressive patients.

인체피부섬유아세포에서 애기달맞이꽃 메탄올추출물의 항 주름 효능

김수은 ( Su Eun Kim ),이채명 ( Chae Myoung Lee ),김영철 ( Young Chul Kim ) 대한미용학회(구 대한미용과학회) 2016 대한미용학회지 Vol.12 No.3

The objective of this study was to evaluate the anti-wrinkle efficacy of Oenothera laciniata methanol extract (OLME) in vitro using human dermal fibroblasts. Specifically, we tested the type-I procollagen synthetic ability of OLME at concentrations of 6.25, 12.5, 25, and 50 μg/mL and noted significantly significant (p<0.05) increases versus the control of 38.7, 74.3, 111.4, and 113.0%, respectively. Using RT-PCR, the expression of MMP-1 mRNA in human dermal fibroblasts treated with 6.25, 12.5, 25, and 50 μg/mL OLME was shown to have decreased when compared to the control by 67.7, 71.7, 75.6, and 84.3%, respectively (p<0.05). When measuring MMP-2 activity in human dermal fibroblasts treated with 6.25, 12.5, 25, and 50 μg/mL OLME using zymography, it was shown to have decreased versus the control by 27.6, 37.1, 76.3, and 93.9%, respectively (p<0.05). OLME was less cytotoxic to human dermal fibroblasts than ascorbic acid. From these results, we found that OLME is highly efficacious in its ability to promote collagen synthesis and inhibit its degradation in human dermal fibroblasts, similar or even superior to those of ascorbic acid, a well-known anti-skin aging agent. Therefore, OLME could be used as a functional cosmetic material for the prevention or alleviation of skin wrinkles induced by ultraviolet rays.

다차원 연관 분석을 이용한 인터넷 이용자의 특징 분석

이수은,정용규,Lee, Su-Eun,Jung, Yong-Gyu 서비스사이언스학회 2011 서비스연구 Vol.1 No.1

데이터 마이닝은 대용량의 데이터베이스로부터 기존에 알려지지 않은, 즉 단순한 질의어로 추출할 수 없는 형태의 '유용한' 정보를 찾아내고 이를 바탕으로 데이터에 대한 통찰(insight)을 얻는 것으로 정의할 수 있다. 본 논문에서는 웹에서 발생하거나 웹 사이트에 저장한 데이터를 대상으로 유용한 패턴을 찾아내기 위하여 인터넷을 이용하는 이용자의 특징을 분석하기 위해 시도되었다. 즉 인터넷 사용자에 대한 일반적인 통계 정보 데이터에 연관성 분석을 적용하여 인터넷 사용 시간에 영향을 미치는 인터넷 이용자의 특징을 분석하였다. 실험을 통하여 데이터로부터의 연관 규칙을 추출 해내었으며, 최적의 결과를 도출하기위한 데이터 전처리 및 알고리즘을 적용하여 웹 마이닝을 위한 인터넷 사용자의 특징을 분석한 결과 그 유용성을 확인할 수 있었다. Data mining that can not be extracted with a simple query in the form of "useful" means to find information in large databases from the existing and unknown knowledge. It is based on this insight about the data can be defined as a gain. In this paper, we use the Internet to find useful patterns on the Web or saved data to the target Web site, which is to analyze the characteristics of users. A general statistical information on Internet users to the data by applying a relevance analysis, Internet use affect the amount of time to analyze the characteristics of Internet users. Only through experiments extracting data from the association rules, producing optimal results apply for the data pre-processing and algorithm for mining the Web to Internet users. characteristics were analyzed.

일반연제 발표 : 만성 혈액투석 환자에서 심비대 예견 인자로서의 CRP

유수은 ( Yu Su Eun ),박철휘 ( Park Cheol Hwi ),신영신 ( Sin Yeong Sin ),이승헌 ( Lee Seung Heon ),윤선애 ( Yun Seon Ae ),김석영 ( Kim Seog Yeong ),최의진 ( Choe Ui Jin ),장윤식 ( Jang Yun Sig ),방병기 ( Bang Byeong Gi ) 대한신장학회 2002 춘계학술대회 초록집 Vol.21 No.1

보문 : 천연복합물(애기달맞이꽃, 상황버섯, 감초) 에탄올 추출물의 항산화 활성 및 피부미백 효능

김수은 ( Su Eun Kim ),김영훈 ( Young-hun Kim ),이진태 ( Jin Tae Lee ) 대한미용학회(구 대한미용과학회) 2014 대한미용학회지 Vol.10 No.1

The aim of this study was to assess the antioxidant activity and whitening efficacy of ethanolic extract of herb complex (Oenothera laciniata, Phellinus linteus and Glycyrrhiza uralensis Fischer). The antioxidant activity was evaluated by DPPH-radical inhibition activity, xanthine oxidase (XO) inhibition activity, superoxide dismutase (SOD)- like activity, and ABTS radical inhibition activity. Whitening efficacy was evaluated by mushroom tyrosinase inhibition activity. In the antioxidant activities of ethanolic extract of herb complex at 1,000 μg/mL concentration, DPPH radical inhibition activity was over 80% and similar to that of BHA, positive control. XO inhibition activity was over 90%. The SOD-like activity was over 30%. ABTS radical inhibition activity was over 95%. The ethanolic extract of herb complex reduced the mushroom tyrosinase activity in a dose-dependant manner, showing a inhibitory rate over 60% at 1,000 μg/mL concentration compared to the untreated control. The ethanolic extract of herb complex did not affect on cell growth at test concentrations (0~1,000 μg/mL). From these results, it was found that the ethanolic extract of herb complex had a good antioxidant activity and whitening efficacy. Hence, it could be used as cosmetic ingredients for skin whitening and/or skin anti-ageing.

외국인 학부생 대상 전략 중심 토론 수업의 효과

김수은 ( Kim Su-eun ),이선영 ( Lee Sun-young ) 우리어문학회 2017 우리어문연구 Vol.59 No.-

본 연구의 목적은 외국인 학부생을 대상으로 한 전략 중심의 토론 수업의 효과를 밝히고, 그 결과를 바탕으로 한국어 토론 교육의 새로운 방향을 제안하는 데에 있다. 본 연구에서는 K대학의 선택교양 과목에서 23명의 외국인 학부생을 대상으로 한 학기 동안 전략 중심의 토론 수업을 설계, 진행하였다. 전략중심의 토론 수업은 크게 학습자의 전략 사용을 관찰하는 단계, 토론 전략을 명시적으로 교육하는 단계, 토론 사용을 평가하는 단계 등으로 구성되었다. 한편 토론 전략을 명시적으로 교육하는 단계에서는 주장 전략, 질문 전략, 반박전략 등을 익히고 연습하기를 위한 활동이 제공되었다. 학기 초에 실시한 사전평가와 학기말에 실시한 사후 평가의 결과를 분석한 결과, 토론 수업은 교육적 효과가 있었던 것으로 나타났다. 한편 평가표의 6개의 범주별 교육 효과를 분석한 결과, ‘논리’, ‘화제’, ‘주제’, ‘격식’ 범주에서 교육 효과가 컸다. 4장에서는 그러한 분석 결과를 바탕으로, 향후 전략 중심의 한국어 토론 수업의 방향을 제안하였다. The purpose of this study is to clarify the effects of strategy-oriented debate classes for foreign undergraduates and to suggest a new direction for Korean debate education based on the results. In this study, we designed and conducted strategy-oriented debate classes during one semester for 23 foreign undergraduates studying selected liberal arts subjects at K university. The strategy-oriented debate classes comprised the stages of observing the learner's use of strategies, explicitly teaching debate strategies, and evaluating debate use. At the same time, in the stage of explicitly teaching the debate strategy, we provided activities for learning and practicing the argument strategy, the question strategy, and the refutation strategy. The results of a pre-evaluation at the beginning of the semester and those of a post-evaluation at the end of the semester showed that the debate classes had a positive educational effect. Moreover, the educational effects of six categories of evaluation table were found to be effective in the ‘logic’, ‘topic’, ‘subject’, ‘formal’ categories. Based on these analysis results, the final section of this study proposes a direction for strategy-oriented Korean debate classes in the future.