• Journal of the Korea Institute of Building Construction
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• v.5 no.2 s.16
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• pp.161-166
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• 2005

This study is to evaluate on the increased cost of construction according to the depth change of concrete slabs in apartment building. When we increased the depth of concrete slab from 150mm to 180, 210mm, the qualitative and cost of construction were calculated by the high-rise type, the unit-size type. As a result of this study, in 32 Pyong type, increment of construction cost rate appeared by $5.1\%$ in case of increase from slab 150mm to 180mm, and $10.0\%$ in case of increase from slab 150mm to 210mm. In 45 Pyong type, Increment of construction cost rate appeared by $5.7\%$ in case of increase from slab 150mm to 180mm, and $10.2\%$ in case of increase from slab 150mm to 210mm. In 55 Pyong type, Increment of construction cost rate appeared by $2.4\%$ in case of increase from slab 150mm to 180mm, and $8.9\%$ in case of increase from slab 150mm to 210mm.

• Journal of Environmental Impact Assessment
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• v.15 no.2
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• pp.93-100
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• 2006

In general, the verification to prediction formula in a national road and the main street of a town has been used recklessly in Korea. Therefore we investigated the validity of an existing prediction formula (NIER(87, 99), TR-Noise, KLC(2002)) with correction relationship which was based on both the prediction formular from apartment complex in the field and height 1.5m from the surface level. On the results of measuring the noise level form an isolated distance, the noise level showed that it was 4.5~5.5dB(A) by reason of becoming 2 folder far from a source. From the distribution of noise level measured by the apartment floors, the measurement point (1st floor) was 58.7~71.4dB(A) at its lowest level and the middle floors (3, 5, 7 and 10) were the highest distribution of noise level. From the analysis results on the application validity to an existing prediction formular (NIER(87, 99), TR-Noise, KLC(2002)) in the height 1.5m, the correction coefficients were 0.95~0.96 and the measured values were reasonably close to the predicted values, indicating the validity and adequacy of the predicted models. KLC(2002) model was found accurate within 3dB(A) with 36 data out of the total 42 data, showing the most accuracy among the predict models. However, the developed models have to improve the accuracy with a various of factors.