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인접건축물이 고층건축물의 외장재용 풍하중에 미치는 영향
김원술(Kim Won-Sul),타무라 유키오(Tamura Yukio),요시다 아키히토(Yoshida Akihito) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
This paper describes results of wind tunnel experiments performed at Tokyo Polytechnic University to determine interference effects of local peak pressures on an identical pair of tall buildings to establish design cladding pressures. Measured local peak wind pressure coefficients were compared with those for the walls of an isolated building. The results showed the distribution of maximum (minimum) wind pressure coefficients on walls of a principal building with critical locations of an interfering building, as well as smallest minimum wind pressure coefficients on the side walls of the principal building due to interference. Also, the local peak wind pressure coefficients on the walls of the principal building were higher or lower depending on the locations of the interfering building, and were largely induced by the wake separated from the edges of an upwind interfering building. The authors deal with the shielding effects and channeling effects for various relative locations of the interfering building.
상호간섭효과에 의한 고층건축물에 작용하는 국부풍압에 관한 연구
김원술(Kim Won-Sul),타무라 유키오(Tamura Yukio),요시다 아키히토(Yoshida Akihito) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.1
Most wind codes or standards have been established for isolated buildings. In real environment, the effect of wind load on a group of high-rise buildings could be quite different from that of isolated tall building and its surrounding tall buildings can either increase or decrease not only the whole wind load, but also wind loads locally affecting cladding. Some Wind Standards such as AIJ(2004), AS1170.2(1989) and ASCE7-05(2005) have incorporated design wind loads on buildings and cladding due to effects of mutual interference by neighboring and structures, but there is no concrete information. In this paper, local peak wind pressure coefficients between two identical tall buildings were studied by using wind tunnel experiments, under various locations of interfering buildings and wind directions. The measured peak wind pressure coefficients were compared with those previously obtained from the study of an isolated building. In addition, this study also investigated the interference effects of smallest minimum wind pressure coefficient under various wind angles. The interference effects were examined and presented in detail. The results show that the local peak wind pressure coefficients on the walls of a principal building largely depended on the wind angles and the location of interfering buildings in the wake region.
김정만,안정모,김원술,김정일,신해림,정갑열,김준연,Kim, Jung-Man,Ahn, Jung-Mo,Kim, Won-Sul,Kim, Jung-Il,Shin, Hai-Rim,Jung, Kap-Yeol,Kim, Joon-Youn 대한예방의학회 2000 Journal of Preventive Medicine and Public Health Vol.33 No.2
연, 망간, 알루미늄 및 실리콘에 대하여 직업적 노출이 없는 성인 132명(남성 67명, 여성 65명)을 대상으로 혈중 농도를 정량분석하여 다음과 같은 결과를 얻었다. 평균 혈중 연량(기하평근, 기하표준편차)은 남자군 (3.49, 1.70) ${\mu}g/dL$와 여자군 (3.04, 1.65) ${\mu}g/dL$로서 남자군에서 높았으나 유의한 차이는 없었고, 연령군별로는 남, 여 모두 차이가 없었다. 평균 혈중 망간량은 $0.99{\pm}0.41\;{\mu}g/dL$이었으며, 성별, 연령군별 유의한 차이는 관찰되지 않았다. 평균 혈중 알루미늄량은 $0.59{\pm}0.35\;{\mu}g/dL$이었으며, 성별, 연령군별 유의한 차이는 관찰되지 않았다. 평균 혈중 실리콘량은 남자군 $54.11{\pm}27.64\;{\mu}g/dL$, 여자군 $43.34{\pm}23.51\;{\mu}g/dL$로서 남자군에서 유의하게 높았고(p<0.05), 남자군의 경우 연령이 증가함에 따라 유의한 증가가 관찰되었으나(p<0.05), 여자군의 경우에는 연령군별로 차이가 없었다. 본 연구는 몇 가지 금속의 참고치 설정을 위한 기초 연구의 일환으로 앞으로의 연구에 자료로서 활용함으로써 이들 물질에 의한 인체장해의 평가와 예방관리에 일조 할 수 있을 것으로 생각된다. Objectives : This study was peformed to determine the reference values of blood lead, manganese, aluminium, and silicon in healthy adults. Methods : The subjects were 132 (67 male and 65 female), and classified to three age groups $(\leq39,\;40\sim49,\;and\;50\leq)$. Blood lead, manganese and aluminium were analyzed by atomic absorption spectrophotometer, and blood silicon was analyzed by direct current plasma optical emission spectrometer. Results : Blood lead levels(geometric mean, S.D) were (3.49, 1.70) ${\mu}g/dL$ in male and (3.04, 1.65) ${\mu}g/dL$ in female, but the difference is not significant, and there was no significant difference between age groups. Mean blood manganese level was $0.99{\pm}0.41{\mu}g/dL$, and there was no significant difference between sex or age groups. Mean blood aluminium level was $0.59{\pm}0.35{\mu}g/dL$, and there was no significant difference between sex or age groups. Mean blood silicon level was $54.41{\pm}27.64{\mu}g/dL$ in male and $43.34{\pm}23.51{\mu}g/dL$ in female, and the level in male was significantly higher than that in female (p<0.05). There was significant difference between age groups, and the oldest showed the highest level in male (p<0.05), but no significant difference between age groups in female. Conclusions : Authors hope that this study would provide basic data for determining reference values and evaluating health effects.
소형 수직축 풍력터빈에 대한 동특성 분석 및 동적모델 수정
이진학(Jin Hak Yi),김원술(Won sul Kim),한택희(Taek Hee Han),임승률(Sung yul Yim) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.2
The dynamic characteristics including natural frequencies and excitation frequencies were evaluated for a small 10 kW vertical axis wind turbine for investigating the root cause of excessive vibration of a structure under 30RPM of rotor speed. Acceleration responses were measured at 12 distributed locations for ambient vibration tests during non-operational and operational conditions. The natural frequencies for the lowest 2 bending modes were estimated and the excitation frequencies, i.e. 1P, 2P, 4P, were also estimated according to the rotational speed using the responses under operational conditions (i.e. power generation condition). It was verified that the excessive vibration was due to the resonance between the 4P excitation and the 1st vibration modes. To resolve the resonance issue, dynamic model modification was carried out and concrete filling inside the steel tower up to 7 m height was the most efficient way to increase the 1st natural frequency about 20% by numerical simulation. After the concrete filling, the acceleration responses were measured again and it was observed that the 1st natural frequency was increased as amount of 21% by concrete filling.