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도재용 금속 코핑의 처리 방법에 따른 변연 적합도에 관한 연구
구범모,임주환,조인호,Koo, Bum-Mo,Lim, Ju-Hwan,Cho, In-Ho 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.2
The effect of thermocycling and surface finishing on the marginal fidelity of copings for a metal ceramic crown was examined. Methods for minimizing the loss of marginal fidelity were evaluated. The results were as follows ; 1. Thermocycling of ceramic metal copings resulted in increased marginal gap. 2. The greatest marginal gap occurred during the first thermocycling of the copings. 3. No additional distortion of marginal fidelity occurred when surface finishing and second thermocycling were completed after initial thermocycling. 4. The gap increases according to various treatment methods showed group 1 to be the highest values. 5. There was no significant difference between group 2 and group 3(p>0.05) 6. There was significant difference between group 1 and group 2, 3(p<0.05). 7. There was no significant difference among the measurement sites.
실무자 조사를 통한 초고층 공동주택의 리모델링 방향에 관한 연구
구범모(Koo Bum-Mo),이재혁(Lee Jae-Hyuk),제해성(Je Hae-Seong) 대한건축학회 2007 대한건축학회논문집 Vol.23 No.12
A super high-rise apartment housing, the one of representative housing types in Korea, has a special character that prevent urban place from sprawling by vertical expansion. This study aims to suggest the design direction of remodeling for sustainable super high-rise apartment housing through analyzing the priority of various remodeling factors. It is necessary for establishing the direction of future sustainable remodeling to organize hierarchical structure of remodeling guideline in super high-rise apartment housing and survey for the various practicing professionals. Therefore, the remodeling factors are rebuilt through previous studies and bibliographies for AHP(Analytic Hierarchy Process) method. The hierarchical structure of this study is composed of 5 factors-A)convenience, B)internal/external appearance, C)increase of effective area, D)sustainability, E)economical value- and 26 criteria that are adjusted to each factor through analyzing previous studies that include Green Building I Certification, CASBEE and LEED. The criteria are consisted of 109 architectural elements. As a results, the priority of the design direction of remodeling for sustainable super high-rise apartment housing is in order of: A)convenience, D)sustainability, E)economical value, C)increase of effective area, B)internal/external appearance.
산업현장 추락에 대한 기계학습 알고리즘 기반의 다집단 분류
구범모(Bum Mo Koo),김종만(Jong Man Kim),남예진(Ye Jin Nam),성동진(Dong Jin Sung),심재우(Jae Woo Shim),양수민(Su Min Yang),김영호(Young Ho Kim) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.3
본 연구에서는 웨어러블 관성센서를 사용하여 산업현장 추락에 대한 기계학습 기반의 다집단 분류를 시도하였다. 20명의 건강한 성인 남성을 모집하였으며, 15가지 non-FFH 동작과 5가지 low-hazard-FFH 동작 그리고 한 가지 high-hazard-FFH 동작을 3회씩 반복 측정하였다. 5개의 기계학습 기법(SVM, k-NN, LDA, QDA, MLP)에 대하여 two-class 분류성능과 three-class 분류성능을 비교하였다. 분석 결과 SVM이 two-class 분류와 three-class 분류에서 각각 99.5%와 98.2%의 가장 높은 정확도를 보였다. 또한, 세 가지 전처리 기법들(SMOTE, min-max 정규화, univariant feature selection) 역시 알고리즘 성능 향상에 기여함을 볼 수 있었다. In this study, a multi-class classification of industrial fall from height (FFH) based on machine learning was tried using a wearable inertial sensor. Twenty healthy adult males were recruited for the experiment. The experiment protocol consisted of 15 non-FFH, five low-hazard-FFH, and one high-hazard-FFH. Each motion was conducted three times repeatedly. Two-class classification performance and three-class classification performance were compared for five different machine learning techniques (SVM, k-NN, LDA, QDA, and MLP). As a result, SVM showed the highest accuracy of 99.52% and 98.25% in two-class classification and three-class classification, respectively. In addition, the three preprocessing techniques (SMOTE, min-max regularization, and univariant feature selection) contributed to the improvement of algorithm performance.