활성탄소천 전극을 이용한 NaCl과 NaF 용액에서 축전식 이온제거

이광석,김종환,김진환 한국공업화학회 2003 응용화학 Vol.7 No.1

Electrosorption is defined as potential-induced adsorption on the surface of charged electrodes. After polarization of the electrodes, ions are removed from the electrolyte solution by the imposed electric field and held in electric double layers formed at the surface of electrodes. Unlike ion exchange, no chemicals are required for regeneration of the system, hence no secondary waste is generated. In this study, experimental electrosorption of ions from aqueous NaCI and NaF solutions were conducted using activated carbon cloth electrodes and the effects of distance between electrodes, applied voltage and electrolyte concentration on the electrosorption capacity have been investigated.

N-아세틸시스테인 투여후 발생한 급성 무기폐 : 증례보고

이광범,안용미,이철승,최준석,박천희 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.34 No.1

Causes of atelectasis under general anesthesia are tracheal foreign body, blood clot, aspiration of bronchial secretion, one-lung ventilation and relative predominance of parasympathetic system. N-acetylcysteine is mucolytic agent which improves the capability of sputum drainage. After administration of N-acetylcysteine, an increased volume of liquified bronchial secretions may occur. When cough is inadequate, the airway must be maintained open by mechanical suction. In case that is a mechanical block due to local accumulation, the airway should be cleared by endotracheal aspiration. A 49-year-old female was admitted for bilateral laparoscopic oophorectomy due to ovarian tumors. There was not any problem during a general anesthesia induction. After instillation of N-acetylcysteine into endotracheal tube, acute atelectasis was developed in right lower lung.

Benzoate, m-Toluate, Phenol의 Pseudomonas putida에 의한 생분해

김장규,김석형,김태환,이대광,김남기 成均館大學校 科學技術硏究所 1993 論文集 Vol.44 No.1

It this study, basic data were obtained for the treatment of industrial waste water which includes aromatic compounds. Substrate concentrations used were 100ppm, 500ppm, and 1,000pprn and initial pH's were pH6, pH7, and pH8 in order to obtain the optimum conditions for treating benzoate, m-toluate, and phenol by Pseudomonas putida(KCTC 1644). Durations were 20hrs for 100ppm, 40hrs for 500ppm, and 60hrs for 1,000ppm before the static growth of Pseudomonas putida. 100% of 100ppm benzoate(0.31g cell/1) was biodegraded at pH6, pH7, and pH8 before 20hrs, 52.8% of 500ppm at pH8 in 40hrs, and 27.9% of 1,000ppm at pH8 in 60hrs. The best initial pH was pH8 for the biodegradation and the growth of Pseudomonas putida in benzoate medium. For m-toluate, the best initial pH was also pH8. At this pH, 40.6% of 10Dppm(0.31 cell/1), 21.9% of 500ppm, and 14.1% of 1,000ppm m-toluate were biodegraded respectively in limited time. But for phenol, the best initial pH was pH7. At this point, 9.8% of 100ppm(0.218 cell/1), 7.1% of 500ppm, and 4.7% of 1,000ppm phenol were biodegraded respectively. Therefore, the best carbon source in this experiment was benzoate. Pseudomonas putida was also able to biodegrade m-cresol, p-hydroxybenzoic acid, and benzaldehyde.

폴리아닐린/폴리이미드 혼합막의 제조와 기체분리특성

이형록,이광석,김진환 한국공업화학회 2003 응용화학 Vol.7 No.1

Polyaniline(PAN)/Polyimide(PI) blended membernes were prepared and the effect of mixing ration of PANI and PI on the stuctural properties and the gas transportproerties was studied. The polyamic acid(PAA) solution was prepared from 6FDAand ODA in NMP solvent. The PANI/PI blended membranes were obtained bymixing PAA solution and PANI solution. The gas permeation experiments with H_2,He, O_2,N_2,CO_2, and CH_4 were carried out by variable pressure method at 30℃ and5atm. For all gases tested, the permeability coefficient of OANI/PI blended membranes was higher relative to that of polyamiline and the separation factors for the blended were comparable to polyaniline.

PECVD에 의해 제조된 Sb-doped SnO₂박막의 광학적성질

김근수,윤석영,김광호 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.58 No.-

플라즈마를 이용한 화학증착법 (PECVD)으로 Corning glass 1737 기판에 Sb-doped SnO2 박막을 증착하였다. 플라즈마 화학증착시 반응변수에 따른 박막의 결정상, 표면형상 및 광투과도를 XRD, SEM, AFM 과 그리고 UV-VIS-NIR Spectrophotometer를 이용하여 분석하였다. Thermal CVD에 비해 PECVD법은 박막의 증착속도를 향상시켰고, 박막의 표면형상을 보다 균일하게 하였다. 반응온도 450℃, 유입가스비 R=1.12, RF power 30W에서 결정성과 광투과도가 비교적 뛰어난 Sb-doped tin oxide films을 얻을 수 있었다. Sb-doped tin oxide films were deposited on Coming glass 1737 substrate by plasma enhanced chemical vapor deposition (PECVD) technique. The films deposited at different reaction parameters were investigated by using XRD, SEM, AFM, and UV-VIS-NIR Spectrophotometer. Compared to thermal CVD,PECVD effectively enhanced the deposition rate and smoothed the surface of tin oxide films. Sb-doped tin oxide films which have a relatively good crystallinity and photo-transmission were obtained at deposition temperature 450℃, input gas ratio R=1.12, and RF power 30W.

근사기법을 이용한 신뢰성 해석

엄영섭,유광선,박재용,한석영 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

It is important to represent limit state function in reliability-based design optimization. Since it is very difficult to explicitly represent a limit state function in topology optimization, it is necessary to make the limit state function an approximate function. In case of implementing RSM, the limit state function can easily approximated. In this study, the limit state function of structures was approximated using ADAPRES to obtain the effective response surface modeling as reducing the experiment points. From the result of carrying out the BESO using the ADAPRES, it is concluded that the ADAPRES can be applied to RETO and is more effective than RSM in computing cost.

디-젤 批塵用 移動벨트型 電氣集塵裝置의 小型化에 관한 硏究

文在德,孫鉉,서보혁,金光錫 경북대학교 공과대학 1984 工大硏究誌 Vol.13 No.-

A Moving-Belt Type Electrostatic Precipitator (MBEP) proposed by one of authers has been improved by introducing systematic control concept for the diesel soot particulates from diesel engine exhaust. The proto type MBEP was designed without helping of any precharger or precoagulator of the soot particles, and so it is too large for equipping to the vehicles. The improved one is designed as a systematic control device consisted of a precharger and a MBEP. This systematization makes it possible miniaturizing the size of MBEP without any drop of its collection performance by enhancing the corona field intensity and current density in the collection space concurrently obtained by reducing the interelectrode spacing of corona electrode to collection electrode. As a result, the collection efficiency of present MBEP system, which is reduced by ca. 1/2 in volume to the proto type MBEP, amounts to 82% at the gas velocity of 1.0m/s (this nearly equals to the gas exhaust of a 2000 cc diesel powered vehicle) and gas temperature of ca. 50℃ for the simulated soot particles ranged in size from 0.005μm (mass median diam is 1.0 μm). The collection efficiency of the improved MBEP system of 82% is higher enough to the US EPA regulation limit of 70% of the year of 1985 for the diesel powered light-duty trucks and passenger cars.

관상 동맥 질환에서 아포 E 지단백 유전자 다형성과 혈청 지질치와의 관계

곽선영,김성구,정호석,이유경,이광희,김철현,최태명,현민수,권영주 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

Background and aims: The Apolipoprotein E is a ligand of both the protein component LDL receptor as well as the apo E LDL-Receptor related protein (LRP). It modulates the receptor binding of lipoproteins, with the apolipoprotein E found on cell surfaces as its component, thus serving an important role in the lipid metabolism by carrying out the intracellular transport of cholesterol in lipoproteins. The gene for apolipoprotein E is the product of three common genotypes as well as many more rare alleles. The common genotypes are ε2, ε3, and ε4, and are expressed in the three phenotype isoforms of E2, E3, and E4. In the event that E4 is the main component, a rise in the cholesterol level, as the result of down-regulation of the LDL receptor, is observed. Therefore, those samples with E4 genotypes are known to be in much higher risk of coronary artery disease than those with ε3/ε3, while those with ε2 are in low risk (with the exception of hypertiglyceremai Ⅲ). The aim of this study is to analyze in patients with ischemic heart disease the role of aplipoprotein E alleles in order to seek its correlation with coronary artery disease, as well as to seek whether the polymorphism of apo E produces any differences in the severity of coronary artery disease according to plasma lipid levels. Methods: The subjects for study were 273 patients admitted to the Internal Cardiology Division of the Soonchunhyang University Hospital form December 1998 to February 1999. The subjects were divided into the two groups of which one was ischemic heart disease (IHD) experiment group totaling 105 (avg.60.1 years of age, male/female ratio = 69/36) and the control group totaling 168 (avg. 59.7 years of age, male/female = 73:95). The coronary angiogram was given to 127 subjects, and of this total, 94 have developed significant stenosis in the coronary artery. The stages of the analyzing of the apo E phenotype was first, the separation of DNA from the blood samples, subjecting it to the PCR from with 228 base pairs of expanded products were obtained. The band was determined by means of the reverse hybridization principle on the nitrocellulose strip. Results: From the 105 patients the distributions of apo E phenotypes were as follows: ε3/2(5.7%), ε4/2(1.9%), ε3/3(70%), ε4/3(20%), ε4/4(1.9%). The relative frequencies of each allele are as follow: ε2 (0.038), ε3 (0.833), ε4 (0.128). The results show as follows: ⅰ) The IHD experiment group to have a higher occurrence of ε4/3 phenotypes as well as ε4 alleles than the control group. ⅱ) Both the control group and IHD group showed the largest distribution of ε3/3 for phenotypes, and ε4 for alleles. ⅲ) The IHD group showed less ε2/3 phenotypes as well as significantly less allele frequency of ε3 in comparison to the control group. ⅳ) the IHD group showed a much lower level of HDL in comparison to the control group, while the LDL was significantly higher; samples including the apo ε2 showed a significantly higher level of HDL than those without. Among the control group, samples including apo ε2 showed a significantly higher level of TG (triglyceride) than samples without. No significant difference was found between the experiment apo ε4 sample and the control plasma lipid sample. ⅴ) No significant correlation was found between an apo E polynorphism and the number of involved arteries of a coronary angiogram. Conclusion: Between the experiment IHD group and control group were found differences in the frequency of alleles. The polymorphism of apo E alleles may contribute as a risk factor to the development of heart disease by involving itself in the metabolism and modulation of plasma lipids.

Non-Hodgkin's Lymphoma 환자에서 Doxorubicin(Admycin^R) 정맥주입에 따른 약동학적 특성에 대한 연구

이정애,장인진,방영주,이경훈,임동석,조광재,허대석 大韓臨床藥理學會 1994 臨床藥理學會誌 Vol.2 No.1

Effects of Pine (Pinus koraiensis )-seed Oil Supplementation on Serum Lipid Composition in Rats and Immune Responses in Mice

Kwang-Won Lee,Kwang-Won Yu,Kyung-Mi Kim,Hyung Ju Suh,Seog-Won Lee,Chul Rhee 한국식품과학회 2004 Food Science and Biotechnology Vol.13 No.3