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Ag^(+)/aluminosilica 흡착제에 대한 에탄과 에틸렌의 흡착특성 연구
손의락,한상섭,박종호,김종남,조순행,이태종 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.6
고농도의 에틸렌을 생산하기 위해서 π-complexation을 유도할 수 있는 질산은을 알루미노실리카에 함침시킨 흡착제를 제조하였다. 순수 성분 흡착량 측정을 위해 Cahn balance를 사용하였고, 이성분 흡착량을 측정하기 위해 부피법을 이용하였다. 순수 성분은 온도 298.15 K, 323.15 K, 353.15 K 그리고 압력 0-5.100 mmHg 범위에서 측정하였으며, 이성분은 온도 298.15 K, 323.15 K 그리고 평형 압력 900 mmHg에서 측정하였다. 에탄의 순수성분 흡착량은 Langmuir식으로도 잘 나타낼 수 있었고, 에틸렌의 순수성분 흡착량은 Toth식과 물리흡착면과 화학흡착면을 고려한 Langmuir+Unilan, Langmuir-Freundlich모델이 잘 나타내었다. 표면 덮임 정도가 증가함에 따라 에탄 및 에틸렌의 흡착열이 감소함을 알 수 있었다. 흡착열, 이성분계 흡착등온선을 계산하기 위하여 (Langmuir-Freundlich, Toth식 및 IAS 모델을 사용하였다. To produce high concentration of ethylene, new adsorbents were synthesized by incipient wetness method of AgNO₃ on aluminosilica. Cahn balance was used to measure pure isotherms of C₂H₄ and C₂H₄ and volumetric apparatus was used to measure C2H4-C2H6 binary isotherms. Adsorption isotherms of pure gases were measured at 298.15 K, 323.15 K and 353.15 K, pressure ranges are from 0 mmHg to 5,100 mmHg. Pure ethane isotherm showed good agreement with Langmuir isotherm and pure ethylene isotherm showed good agreement with Langmuir-Freundlich and Langmuir+Unilan isotherms which were derived from considering physical site and chemical site. The decrease in heat of adsorption of ethylene with increasing the coverage was observed and the same result in case of ethane. Langmuir-Freundlich isotherm, Toth isotherm and ideal adsorbed solution(IAS) model were used to calculate isosteric heats of adsorption, and also used to predict binary isotherms.
Myung-Jae Hwang,Insob Hwang,Chungmin Park,Hanul Park,Taejong Son,Jong-Hun Kim 한국역학회 2022 Epidemiology and Health Vol.45 No.-
OBJECTIVES: We aimed to evaluate the severity of suspected severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) reinfection according to variants of concern in Gyeongsangbuk-do and Daegu, Korea. METHODS: The database of coronavirus disease 2019 (COVID-19) cases reported from epidemiological investigations through the integrated system operated by the Korea Disease Control and Prevention Agency, from January 20, 2020 to May 7, 2022 was combined with data from the Health Insurance Review and Assessment Service system. The severity odds ratio (SOR) in secondary infection episodes compared with primary infection was estimated using a generalized linear model with a binomial distribution. RESULTS: In all patients, the SOR of SARS-CoV-2 reinfection was 0.89 (95% confidence interval [CI], 0.82 to 0.95), and the severity was lower than in the first infection. Patients who had been vaccinated within 91 days showed a more attenuated SOR (0.85; 95% CI, 0.74 to 0.98). However, despite vaccination, in patients with both primary and secondary infections caused by the Omicron variant, the severity was reduced to a lesser extent than in patients primarily infected with other variants. CONCLUSIONS: We could make efforts to relieve the severity of COVID-19 in vulnerable populations, in which death is more likely, by recommending booster vaccinations in case of a resurgence.
윤문수 ( Moonsoo Yoon ),김관익 ( Gwanik Kim ),김현영 ( Hyunyoung Kim ),나종수 ( Jongsoo Na ),손태종 ( Taejong Son ),채영문 ( Youngmoon Chae ) 국군의무사령부 2013 대한군진의학학술지 Vol.44 No.1
Objectives : The purpose is 1) to verify that IPTV telemedicine is effective to the soldiers at isolated and remote areas such as at the General Out Post(GOP) and Forward Edge of Battle Area(FEBA); 2) to analyze when the soldiers use telemedicine and what patterns of diseases, illnesses or injuries telemedicine is used to treat; 3) to suggest development measures in terms of law and regulations and to recommend the efficient defense health policies. Methods : This study used medical records of patients who utilized the IPTV telemedicine; and conducted a survey using questionnaire. In addition, this study includes the interview results with the doctors from both the remote hospital and the clinics at the GOP and FEBA. Frequency analysis was used to analyze the data of treatment records and survey results; χ² test was used to find the statistical significance for between case and control group. Results : First, 38 patients(95%) among 40 patients were satisfied with the IPTV telemedicine according to the survey results. There were 77 IPTV telemedicine cases in total for one year. Among them 55 cases(71.4%) did not need further treatment. Second, there were 25 cases(12.6%) at the GOP clinic and 52 cases(5.4%) at the FEBA clinic in terms of IPTV telemedicine. ENT was most frequently used, followed by Orthopaedic Surgery, Internal Medicine, Dental, Dermatology, General Medicine and Opthalmology patients. The reason IPTV telemedicine was used was to consult specialized doctors(70 pts, 90.9%). Conclusions : It is recommended that 1)the dedicated telemedicine department and hospital should be established for the soldiers at the remote and isolated areas; 2) the MND continue to implement telemedicine for GOP, FEBA and other remote ares using current Defense Network and/or Civilian IPTV Network; 3) the MND apply to stress management 4) the MND amend the law in terms of telemedicine for soldiers.