http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Rate of Nuclei Formation of ZSM -5 Zeolite
Seo, Gon,Chung, Kyeong Hwan,Kim, Keun Shik 한국화학공학회 1992 NICE Vol.10 No.5
The crystallization processes of ZSM-5 zeolite from mixture of colloid silica, sodium aluminate, sodium hydroxide and tetrapropyl ammonium bromide at 150-195℃ were studied. As the temperature increases, crystallization time decreases, crystal size becomes smaller, and the distribution becomes narrower. The rate of nuclei formation is deduced from the size distribution of final product under the assumption that crystal is growing at constant rate from the nuclei formed during the induction period. The rate of nuclei formation is also accelerated with temperature increase. When the rate constants of the crystal growth are 0.012-0.170 ㎛·min^(-1) at 150-195℃ the crystallization curves can be simulated with the rate equation of nuclei formation deduced from the crystal size distribution of the final product.
Seo, Gon,Kim, Tae Jin,Lim, Sam Kook,Ko, Chang Hyun,Ryoo, Ryong 한국화학공학회 1998 Korean Journal of Chemical Engineering Vol.15 No.6
Catalytic reduction of dissolved oxygen by hydrazine at room temperature was investigated on Pt catalysts supported on KIT-1 mesoporous material and Y and ZSM-5 zeolites. Pt catalyst supported on AlHIT-1 mesoporous material exhibited high performance ascribed to the high dispersion of Pt and the large diameter lowering diffusion restriction.
THE RATE OF NUCLEI FORMATION OF ZSM -5 ZEOLITE
Seo, Gon,Chung, Kyeong Hwan,Kim, Keun Shik 한국화학공학회 1992 Korean Journal of Chemical Engineering Vol.9 No.3
The crystallization processes of ZSM-5 zeolite from mixture of colloid silica, sodium aluminate, sodium hydroxide and tetrapropyl ammonium bromide at 150-195℃ were studied. As the temperature increases, crystallization time decreases, crystal size becomes smaller, and the distribution becomes narrower. The rate of nuclei formation is deduced from the size distribution of final product under the assumption that crystal is growing at constant rate from the nuclei formed during the induction period. The rate of nuclei formation is also accelerated with temperature increase. When the rate constants of the crystal growth axe 0.012-0.170 ㎛·min^(-1) at 150-195℃, the crystallization curves can be simulated with the rate equation of nuclei formation deduced from the crystal size distribution of the final product.
Skin barrier repair for the prevention of radiation dermatitis in head and neck cancer patients
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: To date, the clinical benefit of topical steroid use has only been demonstrated for radiation dermatitis induced by 50-60Gy in breast cancer. Radiation dermatitis is characterized by erythema, itching, pain, and burning sensation, and there is no consensus on how to prevent it. Objectives: In this study, we clarify the additional benefit of topical steroid and preventive emollient care for radiation dermatitis induced by high-dose (>60Gy) irradiation with chemotherapy in advanced squamous cell carcinoma of the head and neck (SCHN) patients. Methods: Patients with definitive chemoradiotherapy (CRT), when radiation dermatitis grade 1 is seen or total radiation dose reaches 30Gy. If radiation dermatitis worsens to grade 2, the irradiated area will be covered with a moderately absorbent surgical pad only or steroid and topical cream with it. Results: The median radiation dose before the development of grade 2 skin toxicity was <60.5Gy in patients with SCHN. Almost of patients (85.7%) complained burning and local erosion during planned CRT. Standard care was initiated on 78.5% of patients during the study (surgical pad: 78.5%, steroid only:14.4%, emollient only:21.4% both:50.0%). The most effective prescribed modalities in all arms were steroid with emollient in surgical pad covering. Conclusion: This study shows that the clinical benefit of topical steroid and emollient for radiation dermatitis induced by high-dose irradiation with chemotherapy.
The prevalence of onychomycosis in patient with neurologic damage
( Seo Mi Gon Jeong ),( Chang Il Kwon ),( Young Bin Shin ),( Yun Sun Moon ),( Eui Chang Jung ),( Chi Yeon Kim ),( Tae Jin Yoon ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The role of a number of inherited, acquired and environmental factors has been identified to increase the risk of onychomycosis. Objectives: In this study, we attempt to evaluate the frequency of onychomycosis and etiological factors in patients with neurologic impairment. Methods: We investigated the distribution of gender, age, clinical features and duration of disease for all patients. The studied group (n = 242) included 140 patients with nail abnormalities raising a clinical suspicion of nail onychomycosis (with no history of neurologic impairment) and 102 neurosurgery inpatients. The control group included 80 patients with clinically normal nails. The patients were classified into one of the five diagnostic subgroups with standard photographs as reference. The presence of fungi was confirmed in direct microscopy and culture. Results: The prevalence of onychomycosis did not differ significantly between inpatients with neurologic impair and patients with nail alterations. The characteristics of isolated fungal species is yeast (Candida albicans), dermatophyte (Trichophyton rubrum), and molds (Scopulariopsis brevicaulis). Conclusion: This study shows that significantly higher incidence of onychomycosis was observed in neurologic impair patients as well as in patients with clinically abnormal nails compared to controls. The studied group supports the hypothesis that the nuerologic damange is a risk factor for onychomycosis.