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Synthesis of MFI - Type Zeolites Under Atmospheric Pressure
Hyun Ku Rhee,Hyung Seuk Oh,Kyoung Ku Kang,Man Hoe Kim 한국화학공학회 2001 Korean Journal of Chemical Engineering Vol.18 No.1
Silicalite and highly silicious ZSM-5 were synthesized using two reaction mixtures with different crystal growth environments, a dispersed low density mixture and a separated high density mixture, at 93 ±13℃ under the atmospheric pressure. Nucleation behavior and the transformation process of two mixtures were investigated utilizing various analytical techniques such as XRD, FT-IR, TGA, SEM, and pH measurement. During the induction period, the same intermediate phase was observed in both mixtures. The presence of this phase was found to be dependent on the degree of dilution of the reaction mixture. After the induction period, a sharp increase in both the degree of crystaliization and the pH of the reaction mixture was detected. This indicates that the pH change in the reaction mixture is closely related to the crystallization process. From these observations, a crystallization mechanism is proposed on the basis of the appearance of stable silicate species and the role of OH^- ions during the induction period. According to this mechanism, MFI-type zeolite grows by condensation reaction among the stable silicate species funned during the induction period.
오규형,김한석,이춘하 한국산업안전학회 1992 한국안전학회지 Vol.7 No.3
An experimental study was carried out to analyse the explosion characteristics of flammable gas-air mixtures. Used flammable gases were hydrogen, methane, acethylene, ethylene and propane, explosion pressure, explosoin pressure rising rate, and flame propagation velocity were measured experimentaly. The maximum explosion pressure and rising rate of flammmalbe gas-air mixtures were appeared at the range of slightly higher concentration than the stoichiometric concentration. Initial pressure before explosion was controlled from 0.6 to 2.0㎏/㎤ absolutly. Explosion pressure was increased with increment of the initial pressure, and the relationship between initial pressure and explosion pressure was P◎=KP₁. The effect of vessel size on explosion characteristicis was also analysed in this experiment. Explosion pressure was increased with increasing the vessel size, otherwise explosion pressure rising rate was decreased. When we locate a dummy material in vessel explosion pressure was decreased with increasing the dummy volume but exlosion pressure rising rate was increased.
Terephtalic Acid 의 폭발특성에 관한 실험적 연구
오규형,문정기,김한석 한국산업안전학회 1990 한국안전학회지 Vol.5 No.1
In this study the explosion characteristics of terephtalic acid dust(PTA) was investigated with the Hartmann type apparatus. The minimum ignition energy, minimum explosible concentration, flame propagation velocity, explosion pressure, explosion pressure rise rate and the effect of inert dust(talcum) on explosion characteristics were measured. Flame velocity was 50m/s at 700g/㎥ concentration, and the explosion pressure and explosion pressure rise rate were most likely with that of gas explosion. It was found that an inert dust acts as a heat sinker and it disturbs the combustion of flammable dust, as a result, explosion pressure and explosion pressure rise rate were decreased and minimum explosion concentration was increased with increasing the fraction of talcum dust in PTA.
( Jinsoo Min ),( Hyung Woo Kim ),( Yousang Ko ),( Jee Youn Oh ),( Ji Young Kang ),( Ju Sang Kim ),( Sung- Soon Lee ),( Jae Seuk Park ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: The Public-Private Mix (PPM) collaboration project was implemented in 2011 in order to provide comprehensive management of tuberculosis (TB) patient at PPM hospitals in South Korea. PPM collaboration was expanded from 97 hospitals in 2011 to 125 hospitals in 2018. Surveillance and monitoring of TB under the national PPM TB control project is essential to achieve TB elimination goals set by the World Health Organization. Methods: TB is a nationally notifiable disease in South Korea and is monitored using the Korean National TB Surveillance System. The Korea Centers for Disease Control and Prevention quarterly generate monitoring indicators of TB management, which are used in order to oversee activities of PPM hospitals by the steering committee of national PPM project. Based on the notification date, TB patients at PPM hospitals were enrolled in each quarter, which formed a cohort. A cohort was followed up for at least one year to identify treatment results. This report analyzed dataset of cohorts between first quarter of 2016 and fourth quarter of 2017. Results: Coverage of sputum AFB smear and culture among pulmonary TB cases were 92.8% and 91.5%, respectively. Coverage of both phenotypic and genotypic drug susceptibility test among culture-confirmed cases was 92.8%. Treatment success rate among smear-positive drug-susceptible cases was 83.2%. Coverage of latent TB infection treatment among childhood TB contacts was significantly higher than among adult contact (85.6% vs. 56.0, p-value = 0.001). Conclusions: Although the TB rate has decreased significantly after implementation of national PPM control project in South Korea, sustained efforts, such as TB monitoring systems, government supports and political wills, are still required to reduce rates further and reach the goal to end TB.
( Jinsoo Min ),( Hyung Woo Kim ),( Yousang Ko ),( Jee Youn Oh ),( Ji Young Kang ),( Joosun Lee ),( Young Joon Park ),( Sung-soon Lee ),( Jae Seuk Park ),( Ju Sang Kim ) 대한결핵 및 호흡기학회 2020 Tuberculosis and Respiratory Diseases Vol.83 No.3
Background: The national Public-Private Mix (PPM) tuberculosis (TB) control project provides for the comprehensive management of TB patients at private hospitals in South Korea. Surveillance and monitoring of TB under the PPM project are essential toward achieving TB elimination goals. Methods: TB is a nationally notifiable disease in South Korea and is monitored using the surveillance system. The Korea Centers for Disease Control and Prevention quarterly generates monitoring indicators for TB management, used to evaluate activities of the PPM hospitals by the central steering committee of the national PPM TB control project. Based on the notification date, TB patients at PPM hospitals were enrolled in each quarter, forming a cohort, and followed up for at least 12 months to identify treatment outcomes. This report analyzed the dataset of cohorts the first quarter of 2016 through the fourth quarter of 2017. Results: The coverage of sputum, smear, and culture tests among the pulmonary TB cases were 92.8% and 91.5%, respectively. The percentage of positive sputum smear and culture test results were 30.7% and 61.5%, respectively. The coverage of drug susceptibility tests among the culture-confirmed cases was 92.8%. The treatment success rate among the smear-positive drug-susceptible cases was 83.2%. The coverage of latent TB infection treatment among the childhood TB contacts was significantly higher than that among the adult contacts (85.6% vs. 56.0%, p=0.001). Conclusion: This is the first official report to analyze monitoring indicators, describing the current status of the national PPM TB control project. To sustain its effect, strengthening the monitoring and evaluation systems is essential.
Usefulness of Bronchoscopy in Patients with Microbiologically Negative Pulmonary Tuberculosis
( Jee Youn Oh ),( Sung-soon Lee ),( Hyung Woo Kim ),( Jinsoo Min ),( Yousang Ko ),( Hyeon-kyoung Koo ),( Ji Young Kang ),( Ju Sang Kim ),( Jae Seuk Park ),( Yunhyung Kwon ),( Jiyeon Yang ),( Jiyeon Ha 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background Recently, bronchoscopy has been widely used to aid microbiological diagnosis in patients with little sputum. However, the usefulness of bronchoscopy and the patient groups that benefit from subsequent microbiological confirmation have not been established. Methods We retrospectively analyzed the data of the Korean tuberculosis (TB) cohort, a nationwide prospective observation cohort including patients with TB, from September 2018 to October 2019 to evaluate the usefulness of bronchoscopy in patients with microbiologically negative (based on initial sputum polymerase chain reaction and culture Results) pulmonary TB. The primary outcome was the proportion of microbiological diagnoses after bronchoscopy. The secondary outcomes were the predictors of microbiological confirmation and the percentage of additional resistance detection after bronchoscopy. Results A total of 5194 patients were diagnosed with pulmonary TB, and 937 patients were microbiologically negative based on initial sputum findings. Of them, 319 patients underwent bronchoscopy; further microbiological confirmation was checked in 157 (49.1%) patients. The predictors of microbiological confirmation after bronchoscopy were age >65 years, female sex, and low body mass index (BMI). The rate of additional resistance detection was 10.5% [Multidrug resistant (MDR)/Rifampin resistant (RR) 3.8%; Isoniazid resistant (Hr) 5.7%]. Conclusion Bronchoscopy was useful for detecting resistant pathogens. Bronchoscopy should be consider for microbiologically negative pulmonary TB with female, aged >65 years, and low BMI for subsequent microbiological confirmation.