http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
금속유기골격체(MOF)의 휘발성유기화합물(VOCs) 흡착특성에 관한 연구
박경훈(Kyunghoon Park),이민형(Min Hyung Lee),배은진(Eun Jin Bae),김보람(Bo Ram, Kim),백재현(Jae Hyun Beak),홍성호(Sung Ho Hong) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
Volatile Organic Compounds(VOCs) adsorption properties of Metal-Organic Framework(MOF) MIL-100(Fe), which a porous adsorbent with large surface area of about 1800 ㎡/g and pore volume of 0.92 ㎠/g, were investigated in this study. A number of techniques such as biofilteration, absorption, adsorption, membrane separation have been developed to control the VOCs emission and the removal of VOCs from contaminated air. Among those techniques, adsorption removal of VOCs using porous materials is effective technique for the air purification. We observed that the MIL-100(Fe) had a huge potential of used as a adsorbent for the adsorptive removal of VOCs including ammonia, trimethylamine, acetaldehyde, toluene and acetic acid. MIL-100(Fe) showed a higher adsorption capabilities for selected VOCs than Zeolite and Activated carbon. MOFs were superior to other porous materials commonly used including zeolite, activated carbon and their derivatives, because of their high porosity and easily tunable pore size and shape from microporous to mesoporous by changing the organic linkers. VOC molecules were captured in MIL-100(Fe) by the pore filling mechanism, which showed the size and shape selectivity of VOC molecules.
자연발생석면지역의 토양 내 석면함유율에 따른 비산석면 농도평가 - 활동근거시료채취방법(ABS)과 실시간 섬유 측정 장치(F-1 fiber monitor) 결과 비교 -
장광명,박경훈,최성원,김현욱,Jang, Kwangmyung,Park, Kyunghoon,Choi, Sungwon,Kim, Hyunwook 한국산업보건학회 2017 한국산업보건학회지 Vol.27 No.3
Objectives: The present study is aimed at performing real-time measurement of fibrous materials using an F-1 fiber monitor, investigating the correlations between the measurements and environmental conditions, and assessing the feasibility of the use of the monitor in actual exposure assessments based on the accuracy and reliability of the device. Methods: Asbestos specimens with a fixed asbestos content were dispersed in a chamber and collected with a particle measuring test device. Measurements obtained by the existing PCM method, and with the F-1 fiber monitor were compared. In addition, concentrations of asbestos fibers obtained by the PCM method, the TEM method, and the F-1 fiber monitor were compared with that of specific ABS scenarios in NOA regions. Correlations of asbestos contents in soil and weather conditions with each method of measurement were analyzed. Results: Laboratory results showed that levels of asbestos fibers measured with each method increased as fiber contents in soil increased. In the accuracy and reproducibility assessment, no significant differences were found between the different methods of measurement. On-site assessment results showed positive correlations among the methods, and these correlations were less significant compared with what was shown by the laboratory results. Levels of asbestos fibers increased as asbestos contents in soil increased, and as temperature increased. Levels of asbestos fibers decreased as humidity increased, and wind speed did not significantly affect the extent to which asbestos fibers were scattered. Conclusions: While it would be premature to replace existing methods with the use of F-1 fiber monitors in real sites based on the results of this study, the monitor may be useful in the screening of the sites, which assesses hazard levels in different regions. Replacement of existing methods with the use of F-1 fiber monitors may be possible after the limitations identified in this study are overcome, and additional assessment data are obtained and reviewed under different conditions to confirm the reliability of the monitor in future research. Obtained assessment results may be used as basic data for the assessment of asbestos hazard in NOA regions.
축구 하프타임 휴식 중 저온 침수 처치가 혈중 생리 지표 및 염증-면역 반응에 미치는 영향
박순태 ( Suntae Park ),허성훈 ( Sunghoon Hur ),안경준 ( Kyungjun An ),권영우 ( Youngwoo Kwon ),박경훈 ( Kyunghoon Park ),김준호 ( Junho Kim ),이종삼 ( Jongsam Lee ) 대한스포츠의학회 2021 대한스포츠의학회지 Vol.39 No.4
Purpose: We investigated the effects of cold water immersion (CWI) treatment during half-time break on performance related physiological indices during second half soccer match. Methods: Twenty-two collegiate soccer players participated in the study. Subjects undertook 3 minutes head out seated with whole body immersion at 19℃ to 21℃. Total four venous blood samples were collected and analyzed for markers of ionic regulations and inflammatory (interleukin [IL]-1b, IL-6, IL-8, IL-10, tumor necrosis factor-α, and vascular endothelial growth factor) and immune functions (immunoglobulin [Ig] G, IgG2, IgG2, IgG3, IgG4, IgA, and IgM). Results: Partial oxygen concentration and %SO<sub>2</sub> level was lowered in CWI. Hemoglobin and hematocrit values were not significantly different between experimental groups. While there was no notable effect was shown in Na<sup>+</sup> and Ca<sup>2+</sup> , K<sup>+</sup> concentration was higher in CWI during second half match. There were no effects in any of inflammatory and/or anti-inflammatory cytokines and Ig. Conclusion: These results suggest that CWI during half time break exert positively affects in buffering capacity and promote oxygen delivery to the actively recruited skeletal muscle, possibly results in improve soccer performance during second half match.
긴장재 및 차량속도 변화에 따른 콘크리트 충전 타이드 아치형 거더의 동적거동
노화성(Roh Hwasung),홍상현(Hong Sanghyun),박경훈(Park Kyunghoon),이종세(Lee Jong Seh) 대한토목학회 2011 대한토목학회논문집 A Vol.31 No.3A
CFTA 거더는 아치형상을 갖는 콘크리트 충전 강관구조이며 초기처짐 및 공용 중 응력제어를 위해 외부긴장재를 배치한 거더 형식이다. 본 연구에서는 차량진행에 따른 거더의 동적거동에 긴장재가 미치는 영향을 분석하였다. 이를 위해 유한요소 프로그램을 이용하여 거더 및 긴장재 등을 수치모델링하였으며 긴장재의 양과 긴장력을 다양한 값으로 변화시켰다. 차량하중은 도로교설계기준의 DB-24 하중을 고려하였으며 3축-2트랙으로 모델링하였다. 차량하중은 등가절점하중으로 적용시켰으며 차량하중의 이동은 차량통과 시간 및 절점수를 고려한 각 절점에서의 시간함수로 나타내었다. 차량속도는 40 ㎞/hr에서 100 ㎞/hr까지 20 ㎞/hr씩 증가시켰다. 해석결과 긴장재의 긴장력 변화는 거더의 동적거동에 영향을 주지않았으며 초기처짐에만 영향을 주었다. 긴장재의 양에 따라서는 거더의 동적거동이 다르게 나타났으며 긴장재의 양이 적을수록 동적처짐은 증가하였다. 이를 바탕으로 거더의 동적증폭계수(DAF)를 산출하였으며 긴장재가 없는 경우에도 AASHTO LRFD와 도로교 표준시방서에서 정한 기준값보다 매우 작은 안정적인 거동을 보였다. The CFTA girder developed is a concrete filled steel tubular system with arched shape and external post-tensioning (PT) tendons which control the initial camber and the bending stress of the girder. In the present study the effects of the PT tendons on the dynamic behavior of the girder subjected to a moving vehicle load are numerically investigated. Various levels for the tendon quantity and the tendon forces are considered, using the existing FE model of the girder. The vehicle considered is a DB-24 truck and is modeled with two tracks-three axles. Equivalent-load pulse time histories are applied to each node to simulate the moving vehicle, depending on the time of arrival and the discretization. The vehicle speeds are varied from 40 ㎞/hr to 100 km/hr with increment of 20 ㎞/hr. The analysis results show that the tendon forces do not produce any influences on the dynamic responses of the girder. However the dymamic deflection of the girder increases when a smaller amount of tendons is used. The Dynamic Amplification Factors (OAF) are evaluated based on the static and dynamic responses. Much lower values of the OAF are obtained, even no tendons applied, than those provided by the design criteria of the AASHTO LRFD and the Korea Highway Standard Specification.