http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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 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.
Park, Seong Jik,Um, Byung Hwan Walter de Gruyter und Co 2015 Holzforschung Vol.69 No.2
<B>Abstract</B><P>In this study, the extraction conditions of hemicelluloses from mixed hardwoods have been tested. In particular, 3% total titrated alkaline (TTA) green liquor (GL) was used to dissolve certain hemicelluloses and lignin in a manner similar to black liquor extraction, but the pH was maintained at near-neutral conditions, so that oligosaccharides were not completely degraded into isosaccharinic acids. The effects of temperature, time, and acid concentration on the fermentable sugar yields for the extract during secondary hydrolysis were investigated. Chips of mixed northern hardwoods were cooked in a rocking digester at 160°C for 110 min in the GL at a concentration of 3% Na2O-equivalent salts on dry wood. The mass of wood extracted into the GL extract was approximately 11.4% of the debarked wood mass, which resulted in a dilute solution of oligomeric hemicellulosic sugars. Dilute sulfuric acid hydrolysis was performed under the following conditions: 100°C-130°C, 2%-4% H2SO4, and 20-120 min residence time. The maximum fermentable sugar concentration of xylose, mannose, and galactose (XyMaGa) obtained from the hydrolyzed extract was 5.5 g l<SUP>-1</SUP>, representing 91.7% of the maximum possible yield. A factorial design was used to study the effects of temperature and acid concentration on the maximum quantity of XyMaGa oligomers obtained in the extract during secondary hydrolysis. The maximum potential yield of XyMaGa reached 5.34 g l<SUP>-1</SUP>at 130°C, 3.27% H2SO4, and 50.2 min residence time.</P>
Park, Seong-Jik,An, Hee-Kyung Balaban Publishers 2016 Desalination and Water Treatment Vol. No.
<P>In this study, response surface methodology (RSM) is introduced as an efficient method for investigating and optimizing important parameters for the synthesis of an active layer on the surface of a nanofibrous midlayer. The nanofibrous composite membranes fabricated in this study comprised a polyethylenimine (PEI)/trimesoyl chloride (TMC)-active layer, electrospun polysulfone (PSf)/polyethylene glycol (PEG) midlayer, and commercial polyethylene terephthalate (PET) nonwoven mechanical support layer. The PEI/TMC-active layer was fabricated under the following conditions: 2-4 w/v% PEI, 1-3 w/v% camphor sulfonic acid (CSA), and 0.5-1.5 w/v% TMC. The effect of the three parameters on the membrane performance (i.e. permeate flux and salt rejection) in aqueous solutions containing 2,000mg/L NaCl at 7bar was investigated. The Box-Behnken design was used to elucidate the effects of the concentrations of PEI, CSA, and TMC on the membrane performance and optimize these parameters. The results demonstrated that PEI concentration had the most significant influence on both permeate flux and salt rejection. The highest permeate flux and ion rejection values obtained from the polynomial model were 26.83 L/m(2)h and 74.90%, respectively. Confirmation runs revealed that the predicted and experimentally obtained data were within 4.0%, indicating acceptable accuracy of the predicted model attained from the RSM study. Although further research is necessary for confirmation, our results reveal that the RSM used in this experiment could be a useful tool for optimizing parameters for cross-linking reactions and quantitatively evaluating the effect of experimental conditions on nanofiltration properties.</P>
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.
Influence of phosphate on bacterial removal in columns of iron-coated sand
박성직 ( Seong Jik Park ),이창구 ( Chang Gu Lee ),김현정 ( Hyon Chong Kim ),한용운 ( Yong Un Han ),최낙철 ( Nag Chul Choi ),김성배 ( Song Bae Kim ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-
This study investigated the bacterial adhesion to iron-coated sand, focusing on the effect of phosphate concentration on the removal of Escherchia coli. Bacterial mass recoveries decreased as phosphate solution increased from 76.7% to 34.1% over the range of specific phosphate concentration (0, 4, 16ppm) tested. This phenomenon can be attributed to the increment of ionic strength with increase of phosphate concentration, which results in the decrement of the thickness of the electrical double layer around the bacteria and coated sand surfaces. In iron-coated sand, however, bacterial mass recoveries increased from 2.7% to 29.2% as phosphate concentration increased. This result can be explained by phosphate adsorption. Phosphate forms inner-sphere complexes on iron-coated sand surfaces, which can lead to competitive adsorption with bacteria on iron-coated sand.
박성직 ( Park Seong-jik ),이창구 ( Lee Chang-gu ),김성배 ( Kim Song-bae ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-
This study investigated the transport of bacteria through goethite-coated sand, focusing on the effects of coated sand content on the transport of Escherichia coli ATCC 11105. Column experiments was performed in columns (length 30cm, diameter 2.5cm) with varying coated sand contents ranging from 0 to 100%. Results indicate that the mass recovery decreased from 76.7 to 2.7% as the coated sand content increased from 0 to 100%, showing the nonlinear dependency of mass recovery on the content of coated sand. This study demonstrates the importance of the coated sand content in the adhesion of bacteria to goethite-coated sand and furthermore contributes to the knowledge of bacterial removal in positively-charged porous media.