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RISS 인기검색어
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- 저자 : Soon Min Ng (검색결과 4 건)
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Soon Min Ng,Mohd Ashraf Mohamad Ismail,Ismail Abustan 대한토목학회 2015 KSCE JOURNAL OF CIVIL ENGINEERING Vol.19 No.6
A massive slope failure occurred on the 22nd March 2007 after 3 days of continuous rainfall at Precinct 9, Putrajaya, Malaysia. Back analysis carried out identified that the main cause of failure is due to the existing high groundwater level within the cut slope. It is also observed that the continuous discharge from the horizontal drains yield approximately 100 ml/s even during dry season. Thus, it is suspected that the main contribution to the high groundwater level is due to the leakage from the large water tank constructed on the crest of the slope. Electrical resistivity survey was adopted to facilitate the investigation for the source of high groundwater level within the slope. A 3-dimensional resistivity model was developed using the Inverse Distance Weighting (IDW) interpolation method. The 3D resistivity model shows that the high water content zone is not caused by the leakage of water tank but is originated from an unknown source at the south-east side of the slope.
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Improvements in Engineering Properties of Soils through Microbial-Induced Calcite Precipitation
Ng Wei Soon,Lee Min Lee,Tan Chew Khun,Hii Siew Ling 대한토목학회 2013 KSCE JOURNAL OF CIVIL ENGINEERING Vol.17 No.4
Microbial-Induced Calcite Precipitation (MICP) has recently emerged as a sustainable technique for soil improvement. This paper aims to study the effectiveness of MICP in improving the shear strength and reducing the hydraulic conductivity of soils. A species of Bacillus group, B. megaterium was used to trigger the calcite precipitation. The experimental variables included soil types (tropical residual soil and sand), soil densities (85%, 90%, and 95% of their respective maximum densities), and treatment conditions (untreated, treated with cementation reagents only, treated with B. megaterium only, and treated with B. megaterium and cementation reagents). The results showed that MICP could effectively improve shear strength and reduce hydraulic conductivity for both residual soil and sand. The improvements, however, varied with soil densities, soil types, and treatment conditions. With MICP treatment, the improvement ratios in shear strength of the residual soil specimens were significantly higher (1.41-2.64) than those of the sand specimens (1.14-1.25). On the contrary, the sand specimens resulted in greater hydraulic conductivity reduction ratios (0.09-0.15)than those of the residual soil specimens (0.26-0.45). These observations can be explained by the particle-particle contacts per unit volume and pore spaces in the soil specimens. Both soil specimens when treated with cementation reagents only exhibited slight alterations in the shear strength (ranging from 1.06-1.33) and hydraulic conductivity (ranging from 0.69-0.95). The results implied that natural calcite forming microorganisms only exist for insignificant amount. The amount of calcite precipitated in the treated residual soil specimens ranged from 1.080% to 1.889%. The increments of calcite content in the treated sand specimens were comparatively higher, ranging from 2.661% to 6.102%. The results from Scanning Electron Microscope (SEM) analysis confirmed the experimental findings.
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산부인과 영역의 감염증에 대한 Ofloxacin(DL-8280, Tarivid�)의 치료 효과
조정현,민기홍,조동제,송찬호,송경순 中央醫學社 1987 中央醫學 Vol.52 No.8
For the evaluation of the therapeutic effects of Ofloxacin, the clinical study was carried out in 34 patients (20 patients of acute PID, 10 patients of chronic PID and 4 pa-tients of Bartholin adenitis), who visited the department of Obstetrics and Gynecology of Yong Dong Severance Hospital. Culture and its sensitivity test toward Ofloxacin have also studied. We obtained the following results. 1. Efficacy rate of Ofloxacin was 80% in the patients of Acute PID and Bartholin adenitis. 2. Drug susceptibility of Ofloxacin from isolated causative organisms showed that' all of them were susceptible to Ofloxacin. The Ofloxacin is considered to be effective antimicrobial agent for the treatment of the infection in the field of Obstetrics and Gynecology.
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Mohd Ashraf Mohamad Ismail,Soon Min Ng,Ismail Abustan 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.6
Horizontal drains are commonly used in stabilizing slopes. This paper presents a case study of slope failure in Precinct 9, Putrajaya, Malaysia which buried 23 cars and caused the evacuation of 1000 people from their apartments. Recorded data showed that it had been raining heavily with a total cumulative rainfall of 210 mm two days prior to the slope failure occurrence. Post failure investigations suggested that the slope failure is caused by the rise in groundwater level that increased the pore water pressure thus reducing the shear strength. Therefore, horizontal drains were proposed as a remedial measure to enable the lowering of groundwater level to a safe level. Parametric study was carried out to determine the suitable length and ideal location of horizontal drains installation. Geophysical electrical resistivity survey was carried out to determine the ideal location for installing the horizontal drains. The Finite Element seepage analysis and Limit Equilibrium method were used to examine the effect of horizontal drains on slope stability during rainfall. The minimum length required for the horizontal drains is 22.5 m and the best location for installation is at the toe below the lowest berm of the slope. Field monitoring results from piezometers and measurements of discharge rate verified that the installation of horizontal drains are able to lower the groundwater level effectively.
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