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.

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.

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 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>

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 ITS PRE-PULPING EXTRACT

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

고온 처리된 활성알루미나를 이용한 불소 제거

박성직(Seong Jik Park),김재현(Jae Hyeon Kim),이창구(Chang Gu Lee),박정안(Jeong Ann Park),최낙철(Nag Choul Choi),김성배(Song Bae Kim) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.10

본 연구에서는 열처리한 활성알루미나의 불소흡착특성을 분석하였다. 이를 위하여 평형 및 동적 흡착실험을 수행하였고, 용액 pH의 영향과 음이온의 존재에 따른 흡착 특성을 살펴보았다. 또한, 열처리한 활성알루미나의 여재특성을 분석하기 위하여, 전계방출주사현미경(field-emission scanning electron microscope), energy-dispersive spectrometry, X선 회절(X-ray Diffractometer, XRD)분석, 그리고 Brunauer-Emmett-Teller (BET) 비표면적 분석을 수행하였다. 다양한 온도(100, 300, 500, 700℃)에서 열처리한 활성알루미나의 흡착능을 비교한 결과, 높은 불소 농도(50, 100, 200 mg/L)에서 열처리 온도가 높아짐에 따라서 활성알루미나의 흡착량이 증가하는 것으로 나타났다. 특히, 불소 초기농도 200 mg/L에서는 700℃에서 고온처리한 활성알루미나(AA700)의 흡착량이 열처리하지 않은 활성알루미나(UAA)보다 3.67배 큰 것으로 나타났다. AA700과 UAA의 BET분석결과, UAA의 단위질량당 비표면적이 AA700의 비표면적보다 약 2배 큼을 알 수 있었다. XRD 분석결과에 의하면, AA700의 결정구조는 Al₂O₃인 반면, UAA는 boehmite (AlOOH)와 bayerite (Al(OH)3)가 혼합된 형태로 구성되어 있었다. 열처리에 의하여 비표면적이 감소하였음에도 불구하고, AA700의 불소 흡착능이 UAA에 비하여 증가한 이유는 결정구조의 변화 때문으로 판단된다. AA700의 동역학적 흡착실험결과, 불소의 흡착은 24 h 경과 후에 평형에 도달하였다. 또한, 평형 흡착실험결과에 의하면, 여재 당 불소의 최대 흡착량은 5.70 mg/g으로 나타났다. 용액 pH의 영향을 분석한 결과, pH 7에서 불소 흡착이 가장 높았으며, 산성과 알칼리성에서는 불소 흡착이 감소하는 것으로 나타났다. 음이온의 영향을 분석한 결과, 인산염, 질산염, 중탄산염은 불소 흡착을 감소시키는 것으로 나타났다. 본 연구에 의하면, 상용화된 활성알루미나를 이용하여 불소를 제거할 경우, 고온처리를 통하여 활성알루미나의 흡착능을 증가시킬 수 있을 것으로 판단된다. In this study, sorption characteristics of thermally treated activated alumina (AA) for fluoride were investigated. Sorption experiments have been conducted in equilibrium and kinetic batch conditions. Also, effects of solution pH and anions on fluoride removal have been observed. The properties of thermally treated (700℃) activated alumina (AA700) and untreated activated alumina (UAA) were compared using field-emission scanning electron microscope, energy-dispersive spectrometry, X-ray diffractometer (XRD) analysis, and Brunauer-Emmett-Teller (BET) analysis. From the experiments using AA thermally treated at different temperatures (100, 300, 500, 700℃), it was found that at high fluoride concentrations (50, 100, 200 mg/L) the sorption capacity of thermally treated AA increased with increasing thermal treatment temperature. At an initial fluoride concentration of 200 mg/L, the sorption capacity of AA700 was 3.67 times greater than that of UAA. The BET analysis showed that the specific surface area of UAA was about 2 times larger than that of AA700. The XRD analysis indicated that UAA was composed of both boehmite (AlOOH) and bayerite (Al(OH)3) while AA700 was Al₂O₃. The reason that fluoride sorption capacity of AA700 increased despite of decrease in specific surface area compared to UAA could be attributed to the change of crystal structure. The kinetic sorption test showed that fluoride sorption to AA700 arrived at equilibrium after 24 h. The equilibrium test demonstrated that the maximum sorption capacity of AA700 was 5.70 mg/g. Additional batch experiments indicated that fluoride sorption to AA700 was the highest at pH 7, decreasing at both acidic and basic solution pHs. Also, fluoride sorption to AA700 decreased in the presence of anions such as phosphate, nitrate, and carbonate. This study demonstrated that thermal treatment of AA at high temperature could increase its sorption capacity for fluoride.

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_e) 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 (q₀) 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_e, whereas the q₀ values were positively affected. Increasing the column length produced a positive effect on Re, whereas q₀ 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.

통계 분석을 통한 발효용 선펄핑 추출액의 가수분해 조건 개선

박성직(Seong-Jik Park),김성주(Seong-Ju Kim),고형림(Hyoung-Lim Koh),엄병환(Byung-Hwan Um) 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05