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9세 남아에서 진단된 선천성 낭포성 유선종 폐기형 1례
송명학,정주영,김상우,임성직 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.3
Congenital cystic adenomatoid malformation(CCAM) is a developmental abnormality with immaturity and malformation of the small airways and distal lung parenchyma. Depending on the time and type of pulmonary insult, 4-26% of cases have associated congenital abnormalities. Most of the patients with CCAM are diagnosed in neonatal period, and up to 90% within the 2 years of age. Patients present with respiratory distress, cyanosis, or recurrent pneumonia. Rarely presentation may be delayed until late childhood or adulthood. We report a case of CCAM in 9 year old boy.
오영상,이은우,정종혁,문승원,김수현,김동한,양혁승,박정환,박경옥,강성수,이영직 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Tracheobronchopathia osteoplastica is a rare disorder of unknown cause characterized by the projection of numerous bony or cartilaginous submucosal nodules into the tracheobronchial lumen with sparing of the posterior membranous portion of tracheobronchial tree. In the past, most of the cases were diagnosed as secondary finding at autopsy. Nowaday, the key component of the evaluation is flexible fiberoptic laryngoscopy and bronchoscopy, which typically demonstrates irregular spicules of subrnucosal bone and cartilage projecting into the tracheobronchial lumen and causing various degrees of airway obstruction. A 45 years old man was visited Sunchon St. Carollo hospital due to discomfort on throat. We saw several nodules just below vocal cord via laryngoscope. The computed tomography revealed multiple small calcified nqdules on trachea and both main bronchi. Pathologic finding of bronchoscopic biopsy showed abnormal proliferation of bony and cartilagious nodules in the tracheal submucosa. These fingdings were consistent with tracheobronchopathia osteoplastica. We report here on a case of tracheobronchopathia osteoplastica with review of literature.
Seong Ju Kim,Seong-jik Park,Byung Hwan Um 한국목재공학회 2016 목재공학 Vol.44 No.4
A single process using hot water (0% green liquor) and green liquor (GL) was investigated for pre-pulping extraction on two types of raw material. The GL was applied at different alkali charges of 0-5% on a dry wood weight basis. The extractions were performed at an H-factor 900 at 180℃. The 0% and 3% GL extraction detected acetic acid (AA) at 10.02 and 9.94 g/ℓ, extracts derived from hardwood, 2.46 and 3.76 g/ℓ, extracts derived from softwood, respectively. The single liquid-liquid extraction (LLE) was studied using tri-n-alkylphosphine oxide (TAPO). Response surface methodology (RSM) was employed as an efficient approach for predictive model building and optimization of AA recovery conditions. The extraction of AA was evaluated with a three-level factorial design. Three independent variables, pH (0.5-3.5), temperature (25-65℃), and residence time (24-48 min) were investigated. Applying the RSM models obtained, the optimal conditions selected of extracts derived from hard- and softwood with a 3% GL were approximately pH 1.4, 26.6℃, 43.8 min and approximately pH 0.7, 25.2℃, 24.6 min, respectively. The predicted and experimental values of AA recovery yield were similar whilst sugar retention was 100%.
Quantification of Bacterial Attachment-related Parameters in Porous Media
Seong Jik Park,Chang Gu Lee,Song Bae Kim 대한환경공학회 2008 Environmental Engineering Research Vol.13 No.3
Transport of Escherichia coli ATCC 11105 through porous media was investigated in this study using two sets of column experiments to quantify the attachment-related parameters (sticking efficiency, attachment rate coefficient and filter factor). The first set of experiments was performed in quartz sand under different ionic strength conditions (1, 20, 100, 200 mM) while the second experiments were carried out in quartz sand mixed with metal oxyhydroxide-coated sand (0, 5, 10, 25%). The breakthrough curves of bacteria were obtained by monitoring effluent, and then bacterial mass recovery and attachment-related parameters were quantified from these curves. The first experiments showed that the mass recoveries were in the range of 13.3 to 64.7%, decreasing with increasing ionic strength. In the second experiments, the mass recoveries were in the range of 15.0 to 43.4%, decreasing with increasing coated sand content. The analysis indicated that the sticking efficiency, attachment rate coefficient and filter factor increased with increasing ionic strength and coated sand content. The value of filter factor in the first experiments ranged from 1.45 e-2 to 6.72 e-2 1/cm while in the second experiments it ranged from 2.78 e-2 to 6.32 e-2 1/cm. Our filter factor values are one order of magnitude lower than those from other studies. This discrepancy can be attributed to the size of sand used in the experiment. The analysis demonstrated that the travel distance of bacteria estimated using the filter factor can be varied greatly depending on the solution chemistry and charge heterogeneity of porous media.
Seong Jik Park,Joon Kwan Moon,Byung Hwan Um 한국목재공학회 2013 목재공학 Vol.41 No.5
Hemicellulose extract obtained by pre-pulping extraction of woodchips, is very diluted acidic in nature. The major component responsible for this weak acidity is acetic acid, present in levels up to 5~10 g/L. Here, we report an exploratory study on the extract upgrading by reactive solvent extraction of acetic acid as well as ASPEN simulation. In this study, liquid-liquid equilibria for the ternary systems (water + acetic acid + ethyl acetate) were measured at the temperature of 298.15 K and 10 (pH = 2.02), 5 (pH = 2.17), and 1 (pH = 2.48) percent of acetic acid samples were used to carry out liquid-liquid extraction studies using ethyl acetate. In a one-stage batch experiment, 96.0% of acetic acid could be extracted for the solvent when the ratio of organic-to-aqueous phases is 4:1. For simulation results, they were used to estimate the interaction parameters between each of the three compounds of the systems studied for the NRTL and UNIQUAC models. The estimated interaction parameters were successfully used to predict the equilibrium compositions by the two models.
돌로마이트로 충진된 칼럼에서 박테리아 이동에 관한 동역학적 모델 비교
박성직 ( Seong-jik Park ),이창구 ( Chang-gu Lee ),김성배 ( Song-bae Kim ) 한국농공학회 2015 한국농공학회 학술대회초록집 Vol.2015 No.-
The aim of this study was to compare kinetic models to describe the removal of bacteria (Bacillus subtilis ATCC 6633) using dolomite as a filter medium. Column experiments were performed in step injection mode under various conditions of influent bacterial concentration (0.5-2.0 g/L), flow rate (0.5-1.5 mL/min), and column length (10-30 cm). The highest percentage bacterial removal (R<sub>e</sub>) of 75.2 ± 1.6% was obtained under the following conditions: influent bacterial concentration = 1.0 g/L; flow rate = 0.5 mL/min; column length = 20 cm. The highest column capacity for bacterial removal (q<sub>0</sub>) of 2.126±0.067 mg/g was achieved using an influent bacterial concentration of 2.0 g/L, flow rate of 1.0 mL/min, and column length of 20 cm. Increasing the bacterial concentration and flow rate had a negative effect on R<sub>e</sub>, whereas the q<sub>0</sub> values were positively affected. Increasing the column length produced a positive effect on Re, whereas q<sub>0</sub> declined. Simulation of the breakthrough curves (BTCs) using the Adams-Bohart, Thomas, Yoon-Nelson, and dose-response kinetic models demonstrated that the Adams-Bohart model adequately reproduced the initial part of the BTC, whereas the Thomas and Yoon-Nelson models were suitable for describing the transient stage of the BTC between the breakthrough point and saturation point. Compared to the aforementioned models, the dose-response model produced an adequate simulation of the entire BTC.