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고성능 섬유 보강 시멘트 복합체(HPFRCC)를 적용한 세장한 연결보의 내진거동 평가
한상환,권현욱,신명수,이기학,조영욱 한국지진공학회 2013 한국지진공학회논문집 Vol.17 No.6
The hysteretic behavior of diagonal reinforced coupling beams is excellent during earthquakes. However, construction of the diagonal reinforced coupling beams is difficult due to complex reinforcement details required by current code procedures (ACI 318-11). Due to the detail requirement, reinforcement congestion and interference among transverse reinforcement always occur during construction field. When the aspect ratio of the beam is large, the interference of reinforcement becomes more serious. The objective of this paper is to simplify the reinforcement details of slender coupling beams by reducing transverse reinforcement around the beam perimeter. For this purpose, high- performance fiber reinforced cementitious composites are used for making coupling beams. Experiments were conducted using three specimens having aspect ratio 3.5. Test results showed that HPFRCC coupling beams with half the transverse reinforcement required by ACI 318-11 provided identical seismic capacities to the corresponding coupling beams having requirement satisfying the requirement specified in ACI 318-11.
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군용 항공기 이륙소음이 청력, 혈압, 스트레스 및 주관적 인지도에 미치는 영향
한상환,조수헌,고경심,권호장,하미나,주영수,신명희,Han, Sang-Hwan,Cho, Soo-Hun,Koh, Kyung-Shim,Kwon, Ho-Jang,Ha, Mi-Na,Ju, Yeong-Su,Shin, Myung-Hee 대한예방의학회 1997 예방의학회지 Vol.30 No.2
In effort to determine whether aircraft noise can have health effects such as hearing loss, hypertension and psychological stress, a total of 111 male professors and administrative officers working a college near a military airport in Korea(exposed group) and a total of 168 males and 112 females matched by age groups(control groups) were analyzed. Personal noise exposure and indoor and outdoor sound level of jet aircraft noise were measured at the exposed are3. And pure tone, air conduction test and measurement of blood pressure were given to the exposed(males) and matched control groups (males and females). BEPSI(Brief Encounter Psychological Instrument) and psychological response to aircraft noise were examined for the exposed group. The noise dosimetry results revealed time-weighted averages(TWAs) that ranged from 61 to 68 dBA. However the levels encountered during taking off jet airplanes reached 126 dBA for two half minutes time period. Th, audiometric, test showed that mean values of HTL(hearing threshold level) in exposed group at every frequency(500, 1,000, 2,000, 4,000, and 8,000 Hz were much lower than them of male and female control groups. And in old age groups, interaction of age and noise was observed at 8,000 Hz in both ears(p<0.05). Conclusively, aircraft noise does not appear to induce hearing loss directly in high frequency, but may decreased hearing threshold level by interaction of aging process and noise exposure. However, difference of mean values of exposed and control groups on blood pressure was not significantly. In psychological test, annoyance was the most severe psychological response to noise in exposed group, but mean value of BEPSI was not correlated with job duration in exposed group.
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크롬 폭로가 자매염색분체교환 빈도 및 8-hydroxydeoxyguanosine 농도에 미치는 영향
한상환,조수헌,김헌,하미나,주영수,박수민,권호장,김용대,정명희,Han, Sang-Hwan,Cho, Soo-Hun,Kim, Heon,Ha, Mi-Na,Joo, Young-Soo,Park, Soo-Min,Kwon, Ho-Jang,Kim, Yong-Dae,Chung, Myung-Hee 대한예방의학회 1995 예방의학회지 Vol.28 No.2
To elucidate some DNA adducts as a biological marker for workers of chromate pigment, the effects of chromium exposure on the formation of 8-hydroxydeoxyguanosine(8-OH-dG) and sister chromatid exchanges(SCEs) frequency in 38 workers of a pigment plant in Bucheon which utilized lead chromates, were examined. The chromium contents of venous blood and urine were measured as working environmental exposure level. The concentrations of 8-OH-dG in DNA isolated from lymphocytes were determined with high performance liquid chromatography and electrochemical detector and denoted as a molar ratio of 8-OH-dG to deoxyguanosine(dG). The SCEs frequency were analyzed in DNA isolated from lymphocytes. A significant correlation was found between creatinine adjusted urine chromium concentration and the molar ratio of 8-OH-dG to dG(r=0.47, p<0.01). After adjusting the current smoking habit, the correlation coefficient was increased(r=0.62, p<0.05). However, there was no significant correlation between the SCE frequency and chromium exposure. This significant results between molar ratio of 8-OH-dG to dG and chromium exposure are in good agreement with in vitro studies that support the importance of DNA adduct formation for the carcinogenic effect of chromium.
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한상환,Nam Hun Kim,,Soon Wook Cho 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.4
The welded unreinforced flange-welded web (WUF-W) moment connection is one of seven prequalified connections for the special moment frames (SMF) specified in AISC 358-10. Previous studies reported that some WUF-W connections with a steep access hole slope failed before completing a loading cycle of 4% drift ratio. For investigating in detail the effect of access hole geometry including access hole slopes on the connection behavior, experimental tests require excessive costs and efforts because there are the large number of combinations of configuration parameters for access hole geometry. In this study, the cyclic behavior of WUF-W connections is evaluated using three-dimensional nonlinear finite element (FE) analyses with an adequate solid element and failure index. Based on the results of FEA, the effect of configuration parameters on the connection behavior is investigated.
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두충(杜沖) 전탕액(煎湯液)이 흰쥐의 혈청(血淸) 지질(脂質) 대사(代謝)에 미치는 영향(影響)
한상환,Han, Sang-Hwan 대한한방내과학회 2000 대한한방내과학회지 Vol.21 No.3
The effects of 3% Cortex Eucommiae extracts on serum lipid contents were evaluated in rats. Forty-two male Sprague-Dawley rats weighing $100{\pm}10g$ were divided into seven groups and fed different fat diets for four weeks. Each group was administered with following group: Control, basal fat diet, saturated fat diet and unsaturated fat diet respectively was fed 1% cholesterol, Cortex Eucommiae extracts 3%. The contents of serum lipid contents triglyceride in the basal fat diet group were higher than those of control group. The contents of total-cholesterol in serum of the saturated fat diet group was significantly higher than other group. The contents of HDL-cholesterol in serum of the 3% Cortex Eucommiae extract group were higher than those other fat diet group. The contents of LDL-cholesterol in serum of the 3% Cortex Eucommiae ex1ract group was lower than other fat diet groups. These results suggest that 3% Cortex Eucommiae extract group may reduced elevated levels of serum lipid contents in rats different fed fat diet.
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묶음 대각철근을 적용한 철근콘크리트 연결보의 이력거동 평가
한상환,권현욱,신명수,이기학 한국지진공학회 2014 한국지진공학회논문집 Vol.18 No.3
Diagonal reinforced coupling beam of coupled shear walls can provide sufficient strength and stiffness to resist lateral force. However, the reinforcement details for coupling beams required by ACI 318 (2011) are difficult to construct because of the reinforcement congestion and confined interior area. This study presents experimental results about the seismic performance of coupling beams having bundled diagonal reinforcement to improve the workability. Experiments were conducted using half scaled precast coupling beams having an aspect ratio of 2.0. It was observed that the bundled diagonal reinforced coupling beams can develop seismic performance similar to the coupling beams with requirement details specified in ACI 318 (2011).
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