독립성분분석을 이용한 혼합물의 미지성분비율 예측

이혜선,송재기,박해상,전치혁,Lee Hye-Seon,Song Jae-Kee,Park Hae-Sang,Jun Chi-Hyuck 한국통계학회 2006 응용통계연구 Vol.19 No.1

Independent component analysis (ICA) is a statistical method for transforming an observed high-dimensional multivariate data into statistically independent components. ICA has been applied increasingly in wide fields of spectrum application since ICA is able to extract unknown components of a mixture from spectra. We focus on application of ICA for separating independent sources and predicting each composition using extracted components. The theory of ICA is introduced and an application to a metal surface spectra data will be described, where subsequent analysis using non-negative least square method is performed to predict composition ratio of each sample. Furthermore, some simulation experiments are performed to demonstrate the performance of the proposed approach.

타이트 스커트 종류에 따른 동작기능성에 관한 연구

이혜선,최혜선 ( Hei Sun Lee,Hei Sun Choi ) 한국의류학회 1998 한국의류학회지 Vol.22 No.1

The objective of the study was to observe the difference of moving function of lower-limb in relation to the length & silouette of tight skirt. Four types of tight skirts (2 lengths×2 silhouettes) were made for the experiment. The surface E.M.G in four different locations of leg muscles (Rectus femoris, Semitendinosus, Tibalis anterior, Gastrocnemius) were recorded. The sensory test to decide how to be fatigued after longtime wearing of skirt were examined two times per a day. The fatigue sensory test was scored a Likert-type scale (1= no fatigue, 5=heavy fatigue). Data were analyzed by the repeated ANOVA and Duncan`s multiple range test with use of SAS Package. The main results of this study were as follows: 1. As a result of analysis of E.M.G., in case of walking on the floor there was significant difference in the moving function according to length of skirt and in case of stepping there was significant differnce in three ways (length - silhouette, length, silhouette). 2. From the record of walking the step-length, stride-length, step-width were found affected by garments, but foot-angle was not affected. The moving function of slim type was lower than that of semi type and that of ankle-length skirt was lower than that of knee-length skirt. 3. The results of the sensory test agreed with that of E.M.G and Footprints.

사용자 이벤트 기반의 정보구조 모델링을 이용한 비즈니스 업무 분석에서의 클래스 추출 방법

이혜선,박재년,Lee Hye-Seon,Park Jai-Nyun 한국정보처리학회 2005 정보처리학회논문지D Vol.12 No.7

Use case modeling is a widely used technique for functional requirements analysis of business system but it is difficult to identify a use cases at the right level and use case specifications are too long and confusing. It is also hard to determine a functional decomposition Phases·s of use cases. Therefore customer doesn't understand the use cases. This paper is defining concept of the Information Structure Modeling(ISM) and analyzing business system for the customer's perspective. ISM is an efficient mechanism for analyzing user requirements and for Identifying objects in a business system using Attribute Structure Diagram which is a major tool of the ISM that describes user event. This paper is also to show how the classes are classified and derived as event-asset-transaction type in ISM. It provides a user-friendly approach to visually representing business model. 비즈니스 시스템 분석을 위한 유스케이스 모델링은 유스케이스의 기능 별 분해 수준 및 시나리오의 구체적인 기술 단계를 어느 수준까지 작성해야 할 지 결정하기 어렵고 사용자가 분석 결과를 쉽게 이해하기가 어렵다. 본 논문에서는 비즈니스 시스템 분석 단계에서 사용자와 개발자 모두 쉽게 이해할 수 있는 표기법을 사용하여 사용자의 요구사항을 직관적으로 표현할 수 있는 정보구조 모델링을 정의하고, 객체 타입 별로 이벤트 객체, 재산 객체, 거래 객체로 분류 정의하여 추출하는 방법에 대해 제안함으로써 사용자의 요구사항 변경에 쉽게 대처하고, 개발자들이 분석 결과를 기반으로 설계를 위한 클래스 도출을 보다 용이하게 할 수 있도록 한다.

보험 상품 파산 확률 근사 방법의 개선 연구

이혜선,최승경,이의용,Lee, Hye-Sun,Choi, Seung-Kyoung,Lee, Eui-Yong 한국통계학회 2009 응용통계연구 Vol.22 No.5

In this paper, a continuous-time risk process in an insurance business is considered, where the premium rate is constant and the claim process forms a compound Poisson process. We say that a ruin occurs if the surplus of the risk process becomes negative. It is practically impossible to calculate analytically the ruin probability because the theoretical formula of the ruin probability contains the recursive convolutions and infinite sum. Hence, many authors have suggested approximation formulas of the ruin probability. We introduce a new approximation formula of the ruin probability which extends the well-known De Vylder's and exponential approximation formulas. We compare our approximation formula with the existing ones and show numerically that our approximation formula gives closer values to the true ruin probability in most cases.

작업치료학과 학생의 작업치료 이미지 조사

이혜선,김정미,Lee, Hye-sun,Kim, Jung Mii 대한지역사회작업치료학회 2011 대한지역사회작업치료학회지 Vol.1 No.1

목적 : 본연구의 목적은 작업치료전문직의 발전을 위한 작업치료이미지 개선을 위함이다. 연구방법 : 연구대상은 광주 전남 소재 4년제 대학 작업치료학과에 재학 중인 학생들을 대상으로 하였다. 총 340부의 자료를 수집한 결과 누락된 문항이 포함되거나 손상된 설문지를 제외시키고 316부를 비교 분석하였다. 결론 : 1) 작업치료학과 학생들의 작업치료 이미지 인식(M=3.676)은 긍정적인 것으로 나타났다. 2) 본 연구도구요인 분석은 전문적 이미지, 직업적 이미지, 사회적 이미지, 헌신적 이미지 4가지로 구조화하였고 그 결과 전문적 이미지(M=3.925)가 가장 높고, 헌신적 이미지(M=3.84), 직업적 이미지 (M=3.774), 사회성 이미지(M=3.160)의 순이었다. 3) 학년별 작업치료 이미지는 통계적으로 유의한 차이가 없었다.

부분최소자승법과 변수선택을 이용한 코팅두께 예측모델 개발

이혜선,이영록,전치혁,홍재화,Lee, Hye-Seon,Lee, Young-Rok,Jun, Chi-Hyuck,Hong, Jae-Hwa 한국통계학회 2010 응용통계연구 Vol.23 No.2

Coating thickness is one of target variables in quality control process in steel industry. To predict coating thickness and to control quality of anti-fingerprint steel coils, ultraviolet-visible spectra are measured. We propose a variable-interval selection procedure based on the variable importance in projection in partial least square model. Using the proposed variable interval selection method, prediction performance gets better in the reduced model than the full model with full spectra absorbance. It is also shown that the first differencing as a data preprocessing technique does work well for the prediction of coating thickness.

생존분석 기법을 활용한 배전설비 자산상태 추정 방법

이혜선(Hye-Seon Lee),이승호(Seong-Ho Lee),이병성(Byung-Sung Lee) 대한전기학회 2022 대한전기학회 학술대회 논문집 Vol.2022 No.7

중소기업 특성에 따른 외부 협업 활동이 혁신성과에 미치는 영향

이혜선 ( Hye Sun Lee ),오준석 ( Junseok Oh ),이재기 ( Jaeki Lee ),이봉규 ( Bong Gyou Lee ) 한국인터넷정보학회 2013 인터넷정보학회논문지 Vol.14 No.6

Recently, SME`s Collaboration activities have become one of a vital factor for sustaining competitive edge. This is because of the rapidly changing and competitive market environment, and also to leverage performance by overcoming obstacles of having limited internal resources. Discussing about the effects and relationships of the firm`s collaboration activities and its outputs are not new. However, as ICT and various technologies have been diffused into the traditional industries, boundaries and practice capabilities within the industries are becoming ambiguous. Thus contents of the products/services and their development methods are also go and come over the industries. Although many researchers suggested the relations of SME`s collaboration activities and innovation performances, most of the previous literatures are focusing on broad perspectives of firm`s environmental factors rather than considering various SME`s idiosyncrasy factors such as their major product and customer types at once. Therefore, the purpose of this paper is to analyze how SME(Small Medium Enterprise)`s external collaboration activities by their idiosyncrasy act as an input to types of innovation performance. In order to analyze collaboration effects in detail, we defined factors that can represent the SME`s business environment - Perceived importance of using external resources, Perceived importance of external partnership, Collaboration and Collaboration levels of Major Product types, Customer types and lastly the Firm Sizes. We have also specifically divided the performance of innovation types as product innovation and process innovation based on existing research. In this study, the empirical analysis is based on Probit Regression Model to observe the correlations with the impact of each SME`s business environment and their activities. For the empirical data, 497 samples were collected which, this sample data was extracted from the `Korean Open Innovation Survey` performed by ETRI(Korean Electronics Telecommunications Research Institute) in 2010. As a result, empirical test results indicated that the impact of collaboration varies depend on the innovation types (Product and Process Innovation). The Impact of the collaboration level for the product innovation tend to be more effective when SMEs are developing for a final product, targeting on for individual customers (B2C). But on the other hand, the analysis result of the Process innovation tend to be higher than the product innovation, when SMEs are developing raw materials for their partners or to other firms targeting on for manufacturing industries(B2B). Also perceived importance of using external resources has effected to both product and process innovation performance. But Perceived importance of external partnership was statistically insignificant. Interesting finding was that the service product has negative effects on for the process innovation performance. And Relationship between size of the firms and their external collaboration activities with their performance of the innovations indicated that the bigger firms(over 100 of employees) tend to have better for both product and process innovations. Finally, implications of the results can be suggested as performance of innovation can be varied depends on firm`s unique business idiosyncrasy as well as levels of external collaboration activities. The Implication of this research can be considered for firms in selecting an appropriate strategy as well as for policy makers.

철거 적정성 판정을 위한 철거설비 수명추론에 관한 연구

이혜선(Hye-Seon Lee),이승호(Seong-Ho Lee),이병성(Byung-Sung Lee) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

노인의 인지능력과 시지각 능력 상관관계

이혜선 ( Hye Sun Lee ) 고령자·치매작업치료학회 2011 고령자.치매작업치료학회지 Vol.5 No.1

Objective: This study was designed to figure out relationships between cognition and visual perception ability of the elderly. Method: This study was done to 72 subjects whose age are over 60, living in a city. They had not experienced any brain damages and carried out daily routines by themselves in a healthy way. Using MMSE-KC for a diagnosis of cognition ability and MVPT-3 for a diagnosis of a visual perception ability. Result: There was a significant correlation between cognition and a visual perception ability of the elderly. The result of diagnosis on a cognition ability was relatively higher on the males and the younger, but it didn`t show any direct correlations in statistics. The result of diagnosis on a visual perception ability was relatively higher on the males, the younger, and the higher educated group of people. It had a significant correlation in statistics. Conclusion: There were direct correlations between a cognition ability and a visual perception ability of the elderly over 60. However this study had a few limits. Frist, the subjects belong to only one place. Second, the subjects were not sufficient. Therefore, for the further study, subjects are supposed to be from different places and the number of subjects should be abundant. Also, a study on relationship between cognition and visual perception for the handicapped should be carried out continuously. At the same time, the range of the age should be considered wider and the number of subjects also should be more. At the last, we will experiment comparing between patients group and non-patients group at the further study.