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민원발생지역에서의 저진동ㆍ저소음 Granlar Pile의 시공사례
천병식(Chun Byung-Sik),김백영(Kim Baek-Young) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Damages by vibration and noise due to the construction performance are increasing. The rise of construction demand and enlargement of equipments are major reasons of this damage. As a result, the enmity of the people is provoked and this appears to be an obstacle of construction work. Especially, in case of ground improvement construction. Casing pipe is inserted into the Sand Drain, Sand Compaction Pile and Vibrated Crushed-stone Pile by vibration power when carrying out. Hence, a pillar is formed and it creates vibration and noise. This causes a lot of restrictions to construction condition. The low Vibration and low noise construction equipments uses earth auger and hydrulic cylinder for insertion and chopping operation instead of vibro hammer, which is the source of vibration and noise. This minimize ground disturbanceand decrease vibration and noise successfully, but increase chopping effect greatly. Thus, this new equipment is not only suitable for environment but also excellent engineering method of construction.
회색가스 가중합법을 이용한 연소 혼합 가스의 비회색 복사 특성에 관한 연구
박원희(Won-Hee Park),김태국(Tae-Kuk Kim),김백영(Baek-Young Kim) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
The weighted sum of gray gases model(WSGGM) on the spectral basis is considered for arbitrary mixtures of CO₂ and H₂O gases. The data base for the absorption coefficients and the corresponding weights is constructed for some specific wave numbers. This data base is then used to compute the absorptivity of mixture gases where each gases may have a concentration between 0.0 and 1.0. The modeled absorptivities show a good comparison with the narrow band results. But the results show some differences from narrow band data at very low and very high gas temperature regions.