The effects of circadian disturbances induced by night shifts on the mouse peripheral tissues

서동현,배기호,김한성,고창용,Jürgen Schreiber,장영수 한국통합생물학회 2012 Animal cells and systems Vol.16 No.5

We have examined the effect of circadian disturbances induced by night shifts (NSs) on the phenotypes of the tibiae and abdominal adipose tissues (ADTs) in a mouse model by using in vivo micro-computed tomography (micro-CT). We found that the volumes of total and visceral ADTs in the night-shifted group of mice were significantly larger (69 and 92%, respectively) than those in the control. The mean polar moment of inertia, cross-sectional thickness,and bone mineral density of the cortical bone in the night-shifted group of mice were less (13, 5, and 3%, respectively)than those in the control. Moreover, the volume and the thickness of growth plates (GPs) of the tibiae in the nightshifted mice were significantly smaller (22 and 20%, respectively) than those in the control. Taken together, our results indicate that disturbances in the mouse circadian rhythms induced by NSs affect the morphological characteristics of cortical bone, the volume and the thickness of GPs, and the volume of ADTs.

대학의 그린캠퍼스 추진 현황

서동현 대한설비공학회 2014 설비저널 Vol.43 No.1

Facile Solution Synthesis of Colloidal CeO₂ Quantum-dots for Enhanced Photoelectrochemical and Electrochemical Anti-corrosion Performances

서동현,( A. Sivanantham ),( T. S. Shridharan ),( Qu Li ),조인선 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.0

Acidomyces acidophilus를 이용한 바이오필터에서 저농도 황화수소 제거

서동현,이준형,최연규,박준희,김대근 한국대기환경학회 2018 한국대기환경학회 학술대회논문집 Vol.2018 No.10

오리피스와 충돌하는 액적 거동에 관한 연구

서동현,이덕진,이현빈,강보선 한국분무공학회 2022 한국액체미립화학회지 Vol.27 No.4

In this study, the behavior of water droplet impacting on a thin horizontal orifice was investigated. The impact behavior modes, transition velocities and diameters of daughter droplets were analyzed by changing the droplet velocity, orifice diameter and orifice thickness. Four typical modes of impacting droplet on an orifice were observed. The single-droplet and double- droplet transition velocities increased with increasing the orifice thickness and decreased with increasing the orifice diameter. On the other hand, the multi-droplet transition velocity decreased and then increased as the orifice diameter increased. At thin orifice thickness, the single droplet diameter approximated the orifice diameter, and increasing the orifice thickness produced a droplet larger than the orifice diameter. In the case of double droplet mode, the diameter of the first droplet showed a similar tendency like the single droplet mode, but the diameter of the second droplet was smaller than that of the first droplet, and the difference between them was affected more by the orifice thickness.

제조업 사업장 사내협력업체 사고사례의 시스템적 분석에 관한 연구

서동현,최이락,박장현,한우섭 한국안전학회 2022 한국안전학회지 Vol.37 No.5

In this study, an accident at an in-house maintenance subcontractor of a manufacturing company was analyzed using representative systemic analysis methods, and the results were compared to determine the socio-technical and organizational structure causal factors. Systemic accident analyses were performed using AcciMap, STAMP-CAST, and a method that utilizes work processing procedures. The causal factors derived from the three methods were classified according to HFACS classification criteria. AcciMap and STAMP-CAST analyses were able to derive legal problems and defects in organizational structure between the company and the subcontractors. The method that utilized the work processing procedures drew the most causal factors of the three methods but showed some limitations in deriving legal and facility-related problems. Most of the causal factors identified through the systemic methods could be classified according to the HFACS classification criteria, except for the legal and organizational structure matters. Socio-technical and organizational problems with a holistic perspective of the company and subcontractors could be found using systemic analysis methods. However, it is necessary to conduct analysis using various methods in order to derive more comprehensive measures to prevent accidents because each analysis method showed some limitations in the derivation or expression of some causal factors. The results of this study can be helpful in selecting and using an appropriate method for accident analysis. -

상세 건물에너지 시뮬레이션을 위한 표준공동주택모델 정의에 관한 연구

서동현,노병일,임병찬 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.6

표준건물은 건물에너지를 연구하고, 실무를 진행하고, 관련 정책을 개발함에 있어서 필수적인 기반요소임에도 불구하고 국내 관련 연구가 활발하지 못하며, 또한 국가적으로도 정립되어 있지 않다. 본 연구에서는 다양한 국가 및 공공기관의 DB와 관련 연구자들의 그 동안의 연구발표자료를 참고하여 정밀건물에너지해석을 위한 표준공동주택모델을 정의하였다. 정의에 포함된 항목은 건물의 준공년도, 구조방식, 층고 및 층수, 세대면적, 주향, 외피 열관류율, 침기 및 환기율, 냉난방 설비, 설정온도, 조명/기기/급탕 사용밀도 및 프로파일 등 상세 건물모델링에 필수적인 항목들이다. 본 연구에서 정립된 모델은 후속적으로 발표되는 연구 및 기반 DB에 의해 지속적으로 업데이트가 될 수 있기를 희망하며, 주택뿐만 아니라 다른 6개 용도건물에 대한 연구를 확장하여 국내 주요 용도건물에 대한 표준모델이 속히 정의되기를 희망한다. Prototypical building energy model is a versatile tool in building energy modeling, simulation, research and for related engineers, researchers and policy makers. But, there have been not many trials to define the model. In this study, various public domain DB from domestic and foreign government and governmental institutes and research results from individual researchers are utilized to define the model in focusing with whole building energy modeling of apartment house. In the model, building structure type, completed year, gross area, thermal resistance of envelopes, number of floors, aspect ratio of a unit, orientations, WWR, setpoint temperature, HVAC, density and profile of internal gains, DHW demand and profile, etc are defined. Within author’s knowledge, the most credible DB and measurement data are utilized to be a useful model and hope the defined model could be a trigger of the related researches by many other researchers. More six usage type buildings will be defined to cover over 70% of buildings in terms of gross building area.

산업보건 분야에서 시스템적 사고 분석 방법의 활용성 검토 - STAMP를 이용한 메탄올 중독사고 분석을 중심으로 -

서동현,박장현,현종수,김진현 한국산업보건학회 2023 한국산업보건학회지 Vol.33 No.2

Objectives: Methanol poisoning accidents in smartphone parts manufacturing facilities were analyzed using a systemic accident analysis method, and the necessity and possibility of the application of this systemic method in the field of occupational health were reviewed. Methods: A STAMP model for accident analysis was created based on the previously published literature. CAST analysis was performed to find the causal factors of the components and between the components. Results: The STAMP model visually showed the abstract and complex system control structure. The CAST analysis results could include all the causal factors from the previously published literature, and presented them holistically. Additional causal factors that were not presented in the literature were found. Conclusions: The holistic accident analysis results in this study will be helpful to establish comprehensive measures to prevent methanol or other chemical poisoning accidents. Therefore, it will be necessary to use systemic accident analysis methods in the field of occupational health.

제조업에서의 용접⋅용단 작업 중 화재⋅폭발⋅질식 사망사고 특성

서동현,한우섭,이근원 한국안전학회 2019 한국안전학회지 Vol.34 No.3

Many accidents have been occurring during welding and flame cutting work related to maintenance and repair as the domestic manufacturing facilities gradually become decrepit. However, it is not easy to find the accurate statistics and analysis data on accidents occurring during welding or flame cutting operations related to maintenance and repair of machinery and equipment. Therefore, in this study, the fatal accident cases of fire/explosion and asphyxiation that occurred during the welding and flame cutting work in the manufacturing industry were collected and their characteristics were analyzed. Then, we tried to find the connection of the accidents according to the machinery/ equipment and the work content, and to provide the materials and measures that can be used to prevent the similar accidents. We collected 329 cases of the fatal accidents related to fire/explosion and leakage/contact of chemical substances in the domestic manufacturing industry during the last 10 years (2008 ∼ 2017). Among them, 72 accidents occurred during welding or flame cutting were extracted and the related reports were investigated whether they occurred during usual work or unusual work. Also, the machinery/equipment and the work content related to the accidents were classified and analyzed based on the criteria. The analysis results showed that 31 cases of the fire/explosion accidents occurred during usual work and 32 cases during unusual work, and it was found that 9 cases of asphyxiation death occurred during usual work. Then, from the analysis results, the connections of the machinery/equipment and the work contents related to the accidents were schematized into a accident tree.

[건강기획] 봄, 건강하게 멋내자!

서동현 넥스트미디어 2019 넥스트 이코노미 Vol.- No.179