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Jung, Sok-Hee,Ahn, Young-Ho,Oh, Sang-Eun,Lee, Jun-Ho,Cho, Kyu-Taek,Kim, Young-Jin,Kim, Myeong-Woon,Shim, Joon-Mok,Kang, Moon-Sung Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
Understanding exoelectrogenic reactions of the bioanode is limited due to its complexity and the absence of analytics. Impedance and thermodynamics of bioanode, abiotic anode, and riboflavin-amended anode were evaluated. Activation overpotential of the bioanode was negligible compared with that of the abiotic anode. Impedance spectroscopy shows that the bioanode had much lower charge transfer resistance and higher capacitance than the abiotic anode in low frequency reaction. In high frequency reaction, the impedance parameters, however, were relatively similar between the bioanode and the abiotic anode. At open-circuit impedance spectroscopy, a high frequency arc was not detected in the abiotic anode in Nyquist plot. Addition of riboflavin induced a phase angle shift and created curvature in high-frequency arc of the abiotic anode, and it also drastically changed impedance spectra of the bioanode.
Jung Sung-mok,Jung Jaehun 대한의학회 2022 Journal of Korean medical science Vol.37 No.41
Background: The Democratic People’s Republic of Korea (North Korea) had successfully suppressed the coronavirus disease 2019 (COVID-19) epidemic via border closures. However, a rapid surge in incidence was reported due to the spread of the omicron variant (B.1.1.529), leading to a national emergency declaration in May 2022. Moreover, with the lack of vaccine accessibility and medical facilities, it is unclear how the disease burden may be exacerbated. Despite the limited epidemiological data, we aimed to project the COVID-19 transmissions in North Korea and quantify the potential impact of nationwide vaccination, comparing epidemiological outcomes via scenario analysis. Methods: A discrete-time deterministic compartmental model was used. The parameters were calibrated using empirical data. Numerical simulations incorporated nationwide COVID-19 vaccination into the proposed model with various asymptomatic proportions. Results: Our model suggested that the stringent public health and social measures (PHSMs) reduced the severe acute respiratory syndrome coronavirus 2 transmissibility by more than 80% in North Korea. Projections that explicitly incorporated vaccination indicated that nationwide vaccination would be necessary to suppress a huge resurgence in both COVID-19 cases and hospitalizations after the stringent PHSMs are eased. Moreover, vaccinating more than 80% of the population with two doses may keep the peak prevalence of hospitalizations below 1,500, averting more than 40,000 hospitalizations across all scenarios. Conclusion: Nationwide vaccination would be essential to suppress the prevalence of COVID-19 hospitalizations in North Korea after the stringent PHSMs are lifted, especially in the case of a small asymptomatic proportion.
18F-FDG Positron Emission Tomography in Patients with Concomitant Malignancy and Tuberculoma
( Jung Cheol Lee ),( Jin Sook Ryu ),( I Nae Park ),( Chang Min Choi ),( Yeon Mok Oh ),( Sang Do Lee ),( Woo Sung Kim ),( Dong Soon Kim ),( Tae Sun Shim ) 대한결핵 및 호흡기학회 2010 Tuberculosis and Respiratory Diseases Vol.68 No.1
Background: To analyze the result of 18F-FDG positron emission tomography (PET) in patients with a concomitant malignancy and tuberculoma in a tuberculosis (TB)-endemic area. Methods: Twelve patients with a concomitant malignancy and tuberculoma, who underwent whole-body 18F-FDG PET, were evaluated retrospectively. The maximal standardized uptake values (SUVmax) of the malignancy and tuberculoma were compared. In 6 patients, 18F-FDG PET was repeated during the anti-TB treatment and the changes in SUVmax were analyzed. Results: Of the 12 patients, 10 were male. The mean age was 67.2±7.9 years. Tuberculomas were located in the lung (n=10) and lymph nodes (n=2), and tumors were located in the lung (n=6), colon (n=3), stomach (n=1), ovary (n=1) and liver (n=1). Although the mean SUVmax of malignant lesions was higher than that of tuberculomas (5.2±3.2 vs 3.5±2.0), the difference was not significant. In 4 patients, the SUVmax was higher in the tuberculoma than the tumor. After anti-TB treatment in 6 patients, the mean SUVmax of the tuberculomas decreased significantly, from 3.5±2.0 to 1.6±0.9 (p=0.028). Conclusion: In patients with a concomitant malignancy and tuberculoma, SUVmax alone could not differentiate between them. However, 18F-FDG PET may be useful in monitoring the response to anti-TB treatment.
( Sang Hee Lee ),( Min Ji Kim ),( Eun Jung Jo ),( Jung Seop Eom ),( Jeong Ha Mok ),( Mi Hyun Kim ),( Ki Uk Kim ),( Hye Kyung Park ),( Min Ki Lee ),( Kwang Ha Lee ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Currently, patients requiring ventilator care for more than 96 h are de- fined as undergoing prolonged acute mechanical ventilation (PAMV), and the number of such patients is expected to increase. We evaluated the clinical factors related to a poor prognosis by analyzing patients requiring PAMV in the medical intensive care unit (ICU) of a university-affiliated tertiary care hospital in Korea. Methods: We retrospectively analyzed data collected from March 2008 to February 2013. During the study period, 311 patients (41%) were categorized as on PAMV. We analyzed the prognostic factors on day 28 using clinical data gathered from the medical records on day 4 of mechanical ventilation (MV). Results: The median age of the enrolled patients was 67 [interquartile range (IQR) 59-75] years and 223 (71.7%) were male. The 28-day mortality rate after ICU admission was 34.7%. The most common underlying comorbidity was chronic lung disease (31.5%). The median ICU and hospital stays were 15 (IQR 9-27) and 26 (IQR 15-50) days, respectively. The median Acute Physiology and Chronic Health Evaluation and Sequential Organ Failure Assessment scores on the admission day were 17 (IQR 13-21) and 5 (IQR 3-6), respectively. Four variables on day 4 of MV (neuromuscular blocker required [hazard ratio (HR) 2.432, 95% confidence interval (CI) 1.337-4.422; p=0.004], vasopressor required [HR 2.312, 95% CI 1.258-4.248; p=0.007], hemodialysis required [HR 1.913, 95% CI 1.018-3.595; p=0.044], and body mass index = 21 [HR 1.827, 95% CI 1.015-3.288; p=0.044]) were independent factors associated with mortality based on a Cox proportional hazards model that excluded patients (n=12) with a do-not-resuscitate order given before day 4. Conclusions: Four clinical factors on day 4 of MV appear to indicate a poor prognosis in patients with PAMV: vasopressor required, neuromuscular blocker required, hemodialysis required, and body mass index = 21.
Characteristics of transparent conducting Al-doped ZnO films prepared by dc magnetron sputtering
Jung, Sung-Mok,Kim, Young-Hwan,Kim, Seong-Il,Yoo, Sang-Im Elsevier 2011 CURRENT APPLIED PHYSICS Vol.11 No.1
<P><B>Abstract</B></P><P>Al-doped ZnO (AZO) films were deposited on soda-lime glass substrates by using dc magnetron sputtering as a function of argon gas pressure, O<SUB>2</SUB>/Ar gas ratio and substrate temperature, and their electrical and optical properties were investigated. As a result, the resistivity of the AZO films decreased with decreasing argon gas pressure or O<SUB>2</SUB>/Ar gas ratio. However, the lowest resistivity could be obtained at the substrate temperatures of 250 °C. The higher substrate temperature increased the resistivity a little. The transmittance was found to be very sensitive to O<SUB>2</SUB>/Ar gas ratio and substrate temperature. Addition of a very small amount of oxygen to argon (1.23% of O<SUB>2</SUB>/Ar ratio) or slight increase of the substrate temperature from room temperature to 150 °C enhanced the transmittance in visible region remarkably. Conclusively, the AZO films with low resistivity of order of 10<SUP>−4</SUP> Ω cm and high transparency in visible region could be prepared at the substrate temperatures of above 150 °C (the lowest resistivity of 3.19 × 10<SUP>−4</SUP> Ω cm at 250 °C) by dc magnetron sputtering and these films are applicable to various fields which require transparent conducting oxide films.</P>