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HEART기법 활용한 조직의 OH&S경영시스템 및 안전문화와 불안전한 행동 확률에 관한 연구
강동천(Kang, Dong Cheon),천영우(Chon, Young Woo),황용우(Hwang, Yong Woo) 한국서비스경영학회 2020 서비스경영학회지 Vol.21 No.5
The purpose of this study is to predict the probability of unsafe behavior of service workers and to find a reduction plan. In addition, we propose an unsafe behavior probability expression by applying the organizational safety culture level diagnosis factor to the existing HEART technique. For this purpose, this study set up a research model for organizational safety culture by analyzing previous studies and conducted an empirical analysis, and derived formulas in connection with the industrial accident rate of the sample, And the level of safety culture of organization was further derived by the relationship between the cause of unsafe behavior of the organization members and linear multiple. In order to reduce the probability of unsafe behavior of the members, it is necessary to pay attention not only to lower the inherent untrustworthiness by changing to safe work but also to improve the level of organizational safety culture through management system.
파킨슨병환자의 호흡기능, UPDRS 및 Senior Fitness의 관련성
강동연,천상명,성혜련,이경순,김경,Kang, Dong-Yeon,Cheon, Sang-Myung,Cheon, Sang-Myung,Lee, Kyung-Soon,Kim, Kyoung 대한물리치료학회 2014 대한물리치료학회지 Vol.26 No.2
Purpose: The purpose of this study was to examine correlations among UPDRS, respiratory function, and senior fitness and to investigate the effects of restrictive respiratory function on these factors in Parkinson's disease patients. Methods: Subjects (n=25, Hoehn & Yahr (H&Y) stage: 2-3, $69.3{\pm}5.9$ yrs) from D Hospital Parkinson's Disease Center at Busan metropolitan area in the Republic of Korea volunteered for this study. They performed the pulmonary function test, UPDRS, and the senior fitness test. SPSS 18.0 was used for analysis of data, and the collected data were analyzed using Pearson's correlation coefficient (n=25). In addition, Independent t-test was used for determination of differences between two groups (between the normal pulmonary function group (n=10) and the restrictive pulmonary function group (n=10)). Results: Forced vital capacity (FVC (L)) showed significant negative correlation (r=-0.44, p<0.05) with H&Y stage in Parkinson's disease patients, and chair stand showed significant negative correlations (r=0.41, 0.43, 0.42, p<0.05) with FVC (L), FVC (%), and FEV1 (L). FVC (%) showed significant positive correlations (r=0.44, r=0.44, p<0.05) with right and left back scratch. In addition, the restrictive respiratory function group showed significantly lower FVC (%) (p<0.01) and was significantly slower (p<0.05) in the 8-foot up-and-go test than the normal respiratory function group. Conclusion: In conclusion, these results suggest that restrictive respiratory function in PD was related to H&Y stage. In addition, agility of PD patients was lower in the restrictive respiratory function group than in the normal function group.
압력면윙렛/흡입면스퀼러형 터빈 동익 팁누설영역에서의 3차원유동 및 압력손실
천주홍(Joo Hong Cheon),강동범(Dong Bum Kang),이상우(Sang Woo Lee) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.5
본 연구에서는 압력면윙렛/흡입면스퀼러형 터빈 동익 팁에 대하여 익렬 하류에서 3차원 유동 및 압력손실을 측정하였다. 팁간극비 h/s = 1.36%에 대하여, 흡입면스퀼러의 높이는 hs/s = 3.75%로 일정하게 유지하고, 압력면윙렛의 폭은 w/p = 2.64%, 5.28%, 7.92%, 10.55% 등으로 변화시키면서 실험을 수행하였다. 그 결과, 본 연구의 팁은 평면팁 대비 통로와류 영역에서 압력손실의 저감 효과가 매우 뛰어났지만, 팁누설와류 영역에서는 오히려 압력손실을 크게 증가시켰다. 본 연구의 질량평균 압력손실은 평면팁에 비해 크게 낮았지만, 전면스퀼러팁보다는 더 크게 나타났다. 압력면윙렛의 폭이 증가할수록 질량평균 압력손실은 감소하는 경향을 보였다. Three-dimensional flow and aerodynamic loss in the tip-leakage flow region of a turbine blade equipped with both a pressure-side winglet and a suction-side squealer have been measured for the tip gap-to-span ratio of h/s = 1.36%. The suction-side squealer has a fixed height-to-span ratio of hs/s = 3.75% and the pressure-side winglet has width-to-pitch ratios of w/p = 2.64%, 5.28%, 7.92% and 10.55%. The results are compared with those for a plane tip and for a cavity squealer tip of hps/s = 3.75%. The present tip delivers lower loss in the passage vortex region but higher loss in the tip-leakage vortex region, compared to the plane tip. With increasing w/p, its mass-averaged loss tends to be reduced. Regardless of w/p, the present tip provides lower loss than the plane tip but higher loss than the cavity squealer tip.
Type-II ZnO/ZnSe 코어/쉘 이종 구조 합성 및 광촉매활성 평가
이우형,최광일,강동천,백수웅,이석호,임철현,Lee, Woo-Hyoung,Choi, Kwang-Il,Kang, Dong-Cheon,Beak, Su-Woong,Lee, Suk-Ho,Lim, Cheol-Hyun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.3
Recently, various type of nanomaterials such as nanorod, nanowire, nanotube and their core/shell nanostructures have attracted much attention in photocatalyst due to their unique properties. Among them, Type-II core/shell heterostructures have extensively studied because it has exhibited improved electrical and optical properties against their single-component nanostructure. Such structures are expected to offer high absorption efficiency and fast charge transport due to their stepwised energetic combination and large internal surface area. Thus, it has been considered as potential candidates for high efficient photocatalytic activity. In this work, we introduce a novel chemical conversion process to synthesize Type-II ZnO/ZnSe core/shell heterostructures. A plausible conversion mechanism to ZnO/ZnSe core/shell heterostructres was proposed based on SEM, XRD, TEM and XPS analysis. The ZnO/ZnSe heterostructures exhibited excellent photocatalytic activity toward the decomposition of RhB dye compared to the ZnO nanorod arrays due to enhanced light absorption and the type-II cascade band structure.