기관골 신생증 1예

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.

Nanofiltration membranes based on polyvinylidene fluoride nanofibrous scaffolds and crosslinked polyethyleneimine networks

Park, Seong-Jik,Cheedrala, Ravi Kumar,Diallo, Mamadou S.,Kim, Changmin,Kim, In S.,Goddard III, William A. Springer-Verlag 2012 JOURNAL OF NANOPARTICLE RESEARCH Vol.14 No.7

EVALUATION OF THE EFFICIENCY OF SOLVENT SYSTEMS TO REMOVE ACETIC ACID DERIVED FROM ITS PRE-PULPING EXTRACT

Seong Jik PARK,Joon-Kwan MOON,Byung Hwan UM 한국신재생에너지학회 2012 AFORE Vol.2012 No.-

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.

Optimization of fabrication parameters for nanofibrous composite membrane using response surface methodology

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>

Evaluation of the Efficiency of Solvent Systems to Remove Acetic Acid Derived from Pre-pulping Extraction

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.

Optimization study on acid hydrolysis of hardwood-derived hemicellulosic extract for alcohol fermentation using response surface methodology

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>

물 재배시 비료 사용에 따른 암모니아 배출 특성

박성직(Seong-Jik Park),김건엽(Gun-Yeob Kim),이연진(Yeon-Jin Lee),조은지(Eun-Ji Cho),이재인(Jae-In Lee),임은채(Eun-Chae Im) 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11

지화학적 불균질 매질체에서 박테리아 부착에 관한 연구

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.

알루미늄·철 산화물 동시피복모래에서 Bacillus subtilis의 부착

박성직(Seong Jik Park),이창구(Chang Gu Lee),한용운(Yong Un Han),박정안(Jeong Ann Park),김성배(Song Bae Kim) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.7

본 연구에서는 칼럼실험을 이용하여 알루미늄·철 산화물 동시피복모래에서 박테리아(Bacillus subtilis)의 부착에 산화음이온(질산염, 탄산염, 인산염)이 미치는 영향을 조사하였다. 실험결과, 질산염의 경우 피복모래에서의 박테리아 부착은 질산염 이온의 농도변화와 무관하였다. 질산염의 농도가 변화함에 따라(0.1, 1, 10 mM) 질량회수율은 10.9±0.2 %로 일정하였다. 탄산염의 경우 농도가 0.1 mM에서 1 mM로 증가함에 따라 질량회수율이 25.6%에서 39.0%로 증가하였고, 인산염의 경우에도 동일한 농도조건에서 50.9%에서 78.9%로 증가하였다. 이러한 현상은 박테리아 부착에 대한 탄산염과 인산염 이온의 방해효과 때문이었다. 반면, 탄산염/인산염의 농도가 1 mM에서 10 mM로 증가함에 따라 질량회수율이 각각 39.0%에서 23.8%로 78.9%에서 52.6%로 감소하였다. 이러한 현상은 탄산염/인산염의 농도증가에 따라 피복모래표면에 흡착되지 않고 수용액상에 존재하는 탄산염이나 인산염 이온이 이온강도를 증가시킴으로써 일어나는 박테리아 부착에 대한 증진효과 때문이었다. 본 실험조건에서 피복모래에서의 박테리아 부착에 미치는 영향은 인산염, 탄산염, 그리고 질산염 중, 인산염이 가장 큰 것으로 나타났다. This study investigated the influence of oxyanions (nitrate, carbonate, phosphate) on the attachment of bacteria (Bacillus subtilis) to Al-Fe bimetallic oxide-coated sand using column experiments. Results showed that bacterial attachment to the coated sand was independent of nitrate concentration. Bacterial mass recovery remained constant (10.9 0.2%) with varying nitrate concentrations (0.1, 1, 10 mM). In case of carbonate, mass recovery increased from 25.6% to 39.0% with increasing carbonate concentration from 0.1 mM to 1 mM, and mass recovery also increased from 50.9% to 78.9% at the same concentration condition in case of phosphate. This phenomenon could be attributed to the hindrance effect of carbonate and phosphate to bacterial attachment to the coated sand. Meanwhile, with increasing carbonate/phosphate concentration from 1 mM to 10 mM, mass recovery decreased from 39.0% to 23.8% and from 78.9% to 52.6%, respectively. This phenomenon could be ascribed to the enhancement effect of free carbonate/phosphate ions present in solution phase due to increasing carbonate/phosphate concentration, which increase ionic strength and thus enhance bacterial attachment to the coated sand. In our experimental conditions, the effect of phosphate to bacterial attachment to the coated sand was the greatest among phosphate, carbonate, and nitrate.