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초임계 메탄올을 이용한 표면개질된 세리아 나노입자의 합성
안기호 ( Ki He Ahn ),신내철 ( Nae Chul Shin ),김민수 ( Min Soo Kim ),윤용석 ( Yong Sak Youn ),홍기영 ( Gi Young Hong ),이윤우 ( Youn Woo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Ceria is one of the most important catalytic materials which can be used in three-way catalysts, waste water treatment, petroleum refining, etc. So far, many methods have been studied to produce ceria nanoparticles. In this study, ceria nanoparticles were prepared via solvothermal synthesis using supercritical methanol in short reaction time using a batch reactor. The size of synthesized ceria nanoparticles in supercritical methanol is 6 nm without capping agent, which is smaller than that made in supercritical water at the same conditions of 400 oC and 30 MPa. Size difference results from density and critical point difference between water and methanol and slow reaction rate at the surface of ceria particles in supercritical methanol which reduces crystal growth rate. Several organic compounds were added to modify the surface of ceria nanoparticles, and in-situ surface modification was confirmed by FT-IR and TGA analysis. Surface modified ceria nanoparticles have excellent dispersibility in organic solvent. Size and shape of surface modified ceria particles can be controlled by adjusting molar ratio of modifier to precursor and selection of modifier.
천식 환자에서 고해상 흉부 단층 촬영을 이용한 폐기종의 평가
김용훈(Yong Hoon Kim),류은상(Eun Sang Ryoo),홍기영(Ki Young Hong),이준혁(June Hyuk Lee),이태영(Tae Young Lee),서문정(Moon Jung Seo),주재학(Jae Hak Joo),김도진(Do Jin Kim),문승혁(Sung Heuk Moon),어수택(Soo Teak Uh),박춘식(Choon Sik Pa 대한내과학회 2001 대한내과학회지 Vol.60 No.5
Background : Bronchial asthma is a clinical syndrome characterized by reversiblity of airway obstruction. however, many asthma patients have evidence of residual airway obstruction. It has become evident that the repair of chronic inflammatory process can lead to various irreversible changes. It is generally accepted that the most common cause for change is cigarette smoking but it is controversial whether asthma progresses to emphysema. High resolution computed tomography (HRCT) is more sensitive and more accurate than chest plain films in determining the type and extent of emphysema. This study was carried out to determine whether asthma can be a cause of emphysema without the effect of cigarette smoking and to evaluate clinical characterics in asthma patients with emphysema. Methods : We studied 58 asthmatic patients with reversible airway obstruction and evaluated the presence of emphysema using HRCT and pulmonary function test. According to HRCT findings, they were divided into 2 groups: Asthma patients with and without emphysema. Results : Of the 58 patients, 7 were judged to have emphysema. (1) 6 asthma patients with emphysema were smokers, but one patient was nonsmoker. (2) Highly significant differences between patients with and without emphysema were found in cigarette smoking (p<0.01), smoking consumption (p<0.01). (3) There was no significant differences in the duration of asthma, age or sex between patients with and without emphysema. (4) There was no significant differences in FEV1 (%), FEV1/FVC (%), diffusing capacity for carbon monoxide (DLco) (%), DLco/alveolar volume between patients with and without emphysema (5) Differences between asthma patients without emphysema and those with emphysema were found to be significant in bronchial wall thickening (p<0.05) and in total Ig E (p=0.07). Conclusion : These results indicate that smoking is a main factor to cause emphysema in the patient with asthma.(Korean J Med 60:463-471, 2001)
이준혁(Joon Hyeok Lee),홍기영(Ki Young Hong),주재학(Jae Hak Joo),김도진(Do Jin Kim),어수택(Soo Taek Uh),김용훈(Yong Hun Kim),박춘식(Choon Sik Park) 대한내과학회 2001 대한내과학회지 Vol.60 No.3
Backgroud : Wheezes are the oscillation of airway walls that occures when there is airflow limitation, as may be produced by bronchospasm, airway edema or collapse or intraluminal obstruction by neplasm or secretions. Wheezes can be observed in about 34% of bronchiectasis, that defined as abnormal and permanent dilatation of bronchi. Bronchiectasis is associated with bronchial asthma in 2.7-42%. We studed the clinical significance of wheeze observed in bronchiectasis and interrelationships between the bronchiectasis with wheeze and bronchial asthma. Methods : We reviewed the 32 patients with bronchiectasis confirmed by HRCT. Exclusion criteria are acute exacerbation of bronchiectasis, neoplasm, bronchial asthma. The controlled group is 29 bronchial asthma patients and their diagnositc criteria is when the %change of FEV1 after inhaled bronchodilators is 12% or more and absolute change value is ≥200 mL. All patients were performed spirometry, bronchodilator test, bronchial hyperresponsiveness to methacholine, skin prick test and sputum analysis for cell counts. Results : The Wheeze observed in 43.7% of bronchiectasis patients. Wheeze group revealed the more obstructive pattern in spirometry than non-wheeze group (FEV1% 71.0±8.2% vs 91.7±5.5%, p=0.04; FEV1/FVC 61.1±4.4% vs 78.2±3.7%, p=0.009), more bronchodilator responses (8.4±2.1% vs 4.9±1.7%, p=0.045) and more bonchial hyperresponsiveness (positive results in PC20 : 2 in 6 patients vs no positive in 3 patients). Asthma control group has no significant differences with wheeze group. But compared with non-wheeze group, it has significantly decreased lung function (FEV1/FVC 65.5±2.9% vs 78.2±3.7, p=0.004), more bronchodilator responses (14.8±0.6% vs 4.9±1.7%, p=0.001) and more eosinophilic airway inflammations (sputum eosinphile% 11.4±2.0 vs 0.8±0.4, p=0.05). Conclusions : The wheezes observed in bronchiectasis are associated with bronchial hyperresponsiveness and eosinophilic airway inflammations.(Korean J Med 60:242-248, 2001)
이종호,홍기영,허갑범,이현철,임승길,이은직,김경래,송영득,정윤석,문수재,심문정,박유경,송현용 대한내분비학회 1993 Endocrinology and metabolism Vol.8 No.1
The most impotant parameter in predicting value of osteoporotic fracture is the level of BMD(bone mineral density). The formation of peak bone mass is important in the preventive aspect of osteoporotic fracture. Among the factors influencing the formation of peak bone mass, the hereditary influence is believed to be the most important. We studied the importance of hereditary influence in determing peak bone mass by comparing BMDs of mothers and their daughters in college, who are in the age of achieving peak bone mass. The BMDs of daughters were greater than those of mothers, and mean age of menarche in daughters was earlier than that of mothers. Inmothers, BMD of L2-L4 had significant positive correlatins with height, weight, and BMI, however femur neck had positive correlations with weight and BMI. In daughters, BMD of L2-L4 had significant correlatin with weight, total calorie intake and protein intake, but MBD of femur neck had correlation with weight, body fat and animal calcium intake. Daughters of osteopenic mothers might be advised to evaluate the bone mineral density at critical period for the formation of peak bone mass, to identify the risk factors and to encourage more calcium intake. In conclusion, the BMDs of daughters have strong positive correlation with those of mothers. Hereditary influence on peak bone mass can be strongly suggested, but common environmental factors cannot be excluded. (J Kor Endocrinol 8:66~71, 1993)