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Lee, Kyungjae,Lee, Junhyeop,Hwang, Sangwon,Lee, Sangyoun International Society for Simulation Surgery 2017 Journal of International Society for Simulation Su Vol.4 No.1
Purpose In this paper, we proposed alternate neighborhood system and reverse spread-direction approach for accurate and fast cellular automata-based image segmentation method. Materials and Methods On the basis of a simple but effective interactive image segmentation technique based on a cellular automaton, we propose an efficient algorithm by using Moore and designed neighborhood system alternately and reversing the direction of the reference pixels for spreading out to the surrounding pixels. Results In our experiments, the GrabCut database were used for evaluation. According to our experimental results, the proposed method allows cellular automata-based image segmentation method to faster while maintaining the segmentation quality. Conclusion Our results proved that proposed method improved accuracy and reduced computation time, and also could be applied to a large range of applications.
An Efficient Face Recognition using Feature Filter and Subspace Projection Method
Lee, Minkyu,Choi, Jaesung,Lee, Sangyoun International Society for Simulation Surgery 2015 Journal of International Society for Simulation Su Vol.2 No.2
Purpose : In this paper we proposed cascade feature filter and projection method for rapid human face recognition for the large-scale high-dimensional face database. Materials and Methods : The relevant features are selected from the large feature set using Fast Correlation-Based Filter method. After feature selection, project them into discriminant using Principal Component Analysis or Linear Discriminant Analysis. Their cascade method reduces the time-complexity without significant degradation of the performance. Results : In our experiments, the ORL database and the extended Yale face database b were used for evaluation. On the ORL database, the processing time was approximately 30-times faster than typical approach with recognition rate 94.22% and on the extended Yale face database b, the processing time was approximately 300-times faster than typical approach with recognition rate 98.74 %. Conclusion : The recognition rate and time-complexity of the proposed method is suitable for real-time face recognition system on the large-scale high-dimensional face database.
Facial Feature Extraction with Its Applications
Lee, Minkyu,Lee, Sangyoun International Society for Simulation Surgery 2015 Journal of International Society for Simulation Su Vol.2 No.1
Purpose In the many face-related application such as head pose estimation, 3D face modeling, facial appearance manipulation, the robust and fast facial feature extraction is necessary. We present the facial feature extraction method based on shape regression and feature selection for real-time facial feature extraction. Materials and Methods The facial features are initialized by statistical shape model and then the shape of facial features are deformed iteratively according to the texture pattern which is selected on the feature pool. Results We obtain fast and robust facial feature extraction result with error less than 4% and processing time less than 12 ms. The alignment error is measured by average of ratio of pixel difference to inter-ocular distance. Conclusion The accuracy and processing time of the method is enough to apply facial feature based application and can be used on the face beautification or 3D face modeling.
직무불안정 스트레스와 소진의 관계에서 성인애착의 조절효과 : 사무직 근로자를 중심으로
이상연(Sangyoun Lee),김정규(Jeonggyu Kim) 한국발달지원학회 2021 발달지원연구 Vol.10 No.2
본 연구는 사무직 근로자들의 직무불안정 스트레스와 소진의 관계에서 성인애착의 역할을 탐색하는데 목적이 있다. 이를 검증하기 위해 사무직 근로자 355명중 최종적으로 352명의 응답 자료를 SPSS 23.0을 활용하여 분석하였다. 연구결과, 첫째, 직무불안정 스트레스와 성인애착(애착불안, 애착회피)은 각각 소진과 정적 상관관계가 있었다. 둘째, 성인애착의 조절효과를 분석한 결과 직무불안정 스트레스와 소진의 관계에서 성인애착(애착불안, 애착회피)의 조절효과가 유의한 것으로 나타났다. 성인애착의 불안정성이 높을수록, 직무 불안정 스트레스가 소진에 미치는 영향력이 작아졌다. 해당 결과는 불안정한 애착의 성인이 직무불안정 스트레스를 겪을 경우, 회피적 대처로 업무에 몰두하여 직무불안정 스트레스가 소진에 미치는 영향력을 줄인 것으로 사료된다. The aim of this study was to investigate the moderating effect of adult attachment on the effect of job instability stress on burnout among office workers. The total of 355 cases participated in this study and only 352 cases of office workers were chosen for data analysis. The data was were analyzed using SPSS 23.0 program, descriptive statistic analysis, t-test, one-way ANOVA, Pearson s correlation analysis, linear Regression, hierarchical linear Regression. The result of this study are as follows. First, result of correlational analysis revealed that there were significant correlations among variables. Both job instability stress and adult attachment(attachment anxiety and attachment avoidance) were positively correlated with burnout. Second, adult attachment(attachment anxiety and attachment avoidance) showed a moderating effect on job instability stress and burnout. As the insecure adult attachment(attachment anxiety and attachment avoidance) increased, the effect of job instability stress on burnout decreased. This result can be understood as reducing the effect of job instability stress on burnout by focusing on work as an avoidant coping strategy when adults with unstable attachment experience job instability stress.
이상연(SangYoun Lee),윤수진(SuJin Yun),박동창(DongChang Park),윤현걸(HyunGull Yoon) 한국추진공학회 2011 한국추진공학회 학술대회논문집 Vol.2011 No.5
에그-박스 코어의 등가 전단 탄성계수를 예측하기 위하여 유한 요소 해석을 수행하였다. 유한 요소 해석을 통한 등가 전단 탄성계수 예측 방법을 검증하기 위하여 등방성 재료인 H130-폼 코어에 대한 유한 요소 해석을 수행하였다. 유한 요소 해석을 통해 얻어진 전단 탄성계수와 참고 문헌에서 주어진 전단 탄성계수가 일치함을 확인하였다. 에그-박스 코어의 상온 및 고온에서의 등가 전단 탄성계수 변화를 확인할 수 있었다. The Finite element modelling is carried to predict the equivalent shear modulus of the Egg-Box core. Homogeneous material H130-foam core is employed to verify the prediction method of equivalent shear modulus. It shows a good agreement between the results of FE calculation and the values available in the reference. As a result of the present work, the equivalent shear modulus of Egg-Box core at various temperatures can be obtained.