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서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)
김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1
Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.
유기질비료 시비량에 따른 오미자 묘목의 초기 생육특성에 관한 연구
이경아,박태호,박성용,김도현,오문국,김민수,안태진,이상원,김영국,안영섭,박충범,차선우,송범헌 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study was carried out to have basic and applied informations to find the optimum nitrogen fertilization level for organic cultivation and to investigate early growth characteristics of Schizandra chinensis Baillon. Different application levels of the organic fertilizer were based on the recommended rate of N fertilizer. Five different levels of the organic fertilizer were applied to S. chinensis and early growth responses such as the length of vine, the diameter of vine, the number of leaves, and the number of branches were investigated. Lengths of main and total vines were shown longer at the level of 1.0 time organic fertilizer than those at others. The vine length at early growth was the highest at the level of 1.0 time organic fertilizer among the treatments. Stem diameter was shown thicker level of 1.0 time organic fertilizer than others on August and September, whereas on October it was the thickest in the conventional cultivation. Number of leaf was increased higher at the level of 1.0 and 2.0 times organic fertilizer than that in the compared to conventional. The number of branches was appeared the lowest at the level of 1.0 time organic fertilizer at early growth, however they were increased through progressing their growth stages. They were not significantly difference among the treatments except for the level of 2.0 times organic fertilizer. Based on the research results, the growth of S. chinensis was commonly higher at the level of 1.0 time organic fertilizer compared to other treatments.
Kim, Jung Sub,Kim, A-Young,Byeon, Young Woon,Ahn, Jae Pyoung,Byun, Dongjin,Lee, Joong Kee Elsevier 2016 ELECTROCHIMICA ACTA Vol.195 No.-
<P><B>Abstract</B></P> <P>Germanium-based multimetallic-oxide materials have attracted significant attention as high-capacity anodes for next generation lithium-ion batteries (LIBs). However, they suffer from poor cyclic stability due to extreme volume expansion and reduced electrical conductivity after repeated cycles. To circumvent these issues, we propose that Ge-based multimetallic-oxide nanowires can be synthesized with electrically conductive carbon to significantly enhance the cyclic stability of the Ge-based anodes. We prepare conformal-carbon-coated Zn<SUB>2</SUB>GeO<SUB>4</SUB> nanowires (NWs) using a microwave-induced hydrothermal method with subsequent thermal decomposition. The obtained carbon-coated Zn<SUB>2</SUB>GeO<SUB>4</SUB>-NW anode exhibits a discharge capacity of 485 mAh/g and a Coulombic efficiency (CE) of 98.4% after 900 cycles at 0.6C. Furthermore, these anodes exhibit outstanding rate-capability characteristics, even with an increased C-rate of 17.7C. This excellent electrochemical performance can be ascribed to the improved electron and ion transport provided and the structurally reinforced conductive layer comprising a conformal carbon layer. Therefore, it is expected that our approach can also be applied to other multimetallic-oxide materials, resulting in large, reversible capacities; excellent cyclic stabilities; and good rate capabilities for high-performance LIBs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon coated Zn<SUB>2</SUB>GeO<SUB>4</SUB> nanowires were synthesized using microwave hydrothermal method. </LI> <LI> The obtained electrode exhibits outstanding rate-capability and cycling stability. </LI> <LI> Uniform carbon layer plays an important role in minimizing the volume change. </LI> <LI> In situ SEM images show reduced volume change in lateral and longitudinal direction. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Electrochemical performance can be ascribed to the improved electron and ion transport provided and the structurally reinforced conductive carbon layer.</P> <P>[DISPLAY OMISSION]</P>
Ko, Young-Dae,Kang, Jin-Gu,Choi, Kyung Jin,Park, Jae-Gwan,Ahn, Jae-Pyoung,Chung, Kyung Yoon,Nam, Kyung-Wan,Yoon, Won-Sub,Kim, Dong-Wan Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.13
<P>Two-dimensional (2-D) nanoplates of iron-substituted calcium cobaltite (Ca<SUB>3</SUB>Co<SUB>3</SUB>FeO<SUB>9</SUB>) are synthesized through a simple citrate-gel method. The lithium electroactivity of Ca<SUB>3</SUB>Co<SUB>3</SUB>FeO<SUB>9</SUB> demonstrates that this is an applicable active anode material. In this study, we focus on the reversible conversion process and internally multi-phasic, nanostructured character occurring in Ca<SUB>3</SUB>Co<SUB>3</SUB>FeO<SUB>9</SUB> nanoplates. Moreover, we demonstrate that in-situ formation of active/inactive nanocomposite improves the conversion reaction kinetics by accommodating the large volume changes during lithium uptake and removal, thereby achieving outstanding rate capabilities.</P> <P>Graphic Abstract</P><P>Two-dimensional nanoplates of iron-substituted calcium cobaltite (Ca<SUB>3</SUB>Co<SUB>3</SUB>FeO<SUB>9</SUB>) synthesized through a simple citrate-gel method are found to be an active anode material. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b817120c'> </P>
소아의 메타콜린 기관지유발검사에서 PC<sub>20</sub>-FEF<sub>25%-75%</sub> 및 △FVC에 대한 분석
김현아 ( Hyeon A Kim ),권정은 ( Jung Eun Kwon ),안지영 ( Ji Young Ahn ),최재영 ( Jae Young Choe ),김동섭 ( Dong Sub Kim ),박숙현 ( Sook Hyun Park ),현명철 ( Myung Chul Hyun ),최봉석 ( Bong Seok Choi ) 대한천식알레르기학회 2021 Allergy Asthma & Respiratory Disease Vol.9 No.3
Purpose: Forced expiratory flow between 25% and 75% (FEF<sub>25%-75%</sub>) is known to sensitively reflect bronchial obstruction. Methacholine challenge test (MCT) has shown varying reduction levels of forced vital capacity (FVC) with the reduction in forced expiratory volume in 1 second (FEV<sub>1</sub>) in asthma. The aim of this study was to evaluate the clinical implication of provocative concentration causing a 20% fall in FEF<sub>25%-75%</sub> (PC<sub>20</sub>-FEF<sub>25%-75%</sub>) and the percentage fall in FVC at the PC<sub>20</sub> dose of methacholine (△FVC). Methods: A total of 194 children who visited the hospital due to respiratory symptoms and underwent MCT were analyzed retrospectively. The patients were divided into 3 groups. Group I had both PC<sub>20</sub>-FEV<sub>1</sub> and PC<sub>20</sub>-FEF<sub>25%-75%</sub> above 16 mg/mL; group II had a PC<sub>20</sub>-FEF<sub>25%-75%</sub> that fell below 16 mg/mL but PC<sub>20</sub>-FEV<sub>1</sub> was 16 mg/mL or above; group III had a PC<sub>20</sub>-FEV<sub>1</sub> and a PC<sub>20</sub>-FEF<sub>25%-75%</sub> that both fell below 16 mg/mL. Results: In group II, PC<sub>20</sub>-FEV<sub>1</sub> was lower (P=0.026) and the rate of change in FEV<sub>1</sub> and FEF<sub>25%-75%</sub> from baseline to 16 mg/mL of methacholine concentration was greater than in group I (both P<0.001). Levels of PC<sub>20</sub>-FEF<sub>25%-75%</sub> were higher in group II compared to group III (P<0.001). △FVC showed a correlation with PC<sub>20</sub>-FEV<sub>1</sub> (P<0.001) only in the whole group. Conclusion: In asthmatic children, PC<sub>20</sub>-FEF<sub>25%-75%</sub> may be associated with bronchial hyperresponsiveness. △FVC was not associated with other parameters in either group. For subjects with a positive finding of PC<sub>20</sub>-FEF<sub>25%-75%</sub> and a negative finding of MCT, the progression to asthma can be suspected. (Allergy Asthma Respir Dis 2021;9:141-147)
Zeolite 5A에서의 H<sub>2</sub>/CO/CO<sub>2</sub> 단성분 및 혼합성분의 흡착평형
안의섭,장성철,최도영,김성현,최대기,Ahn, Eui-Sub,Jang, Seong-Cheol,Choi, Do-Young,Kim, Sung-Hyun,Choi, Dae-Ki 한국화학공학회 2006 Korean Chemical Engineering Research(HWAHAK KONGHA Vol. No.
Zeolite 5A 촉매에서 $H_2$, CO, $CO_2$에 대한 단성분 및 혼합성분의 흡착평형 실험을 정적부피법에 의해 수행하였다. 실험 데이타는 온도범위 293.15 K, 303.15 K, 313.15 K이고, 압력범위는 25 atm까지로 하여 얻었다. 각각의 파라미터들은 단성분 실험을 통해 얻었고, 이를 통해 혼합성분의 흡착 평형을 예측하였으며 실험값과 비교하였다. Zeolite 5A 에서의 $H_2/CO_2$, $CO/CO_2$ 혼합가스의 흡착평형 실험 결과는 Langmuir isotherm, Langmuir-Freundlich isotherm and Dual-Site Langmuir isotherm을 이용해 예측하였다. 그 결과 Dual-Site Langmuir isotherm모델이 가장 유사한 예측을 하는 것으로 나타났다. Adsorption experiments for $H_2$, $CO_2$, CO, and their binary mixtures on zeolite 5A were performed by static volumetric method. Experimental data were obtained at temperatures of 293.15, 303.15 and 313.15 K and at pressures to 25 atm. The parameters obtained from single component adsorption isotherm. Multicomponent adsorption equilibria could be predicted and compared with experimental data. Langmuir isotherm, Langmuir-Freundlich isotherm and Dual-Site Langmuir isotherm be used to predict the experimental results for binary adsorption equilibria of $CO_2/CO$ and $H_2/CO_2$ on zeolite 5A. Dual-Site Langmuir isotherm showed the best agreement with the experimental results.
PV 모듈의 손실 저항 성분을 고려한 I-V 출력 모델링에 관한 연구
홍종경(Jong-kyuong Hong),정태희(Tae-hee Jung),류세환(Se-Hwan Ryu),원창섭(Chang-sub Won),강기환(Gi-Hwan Kang),안형근(Hyungkeun Ahn),한득영(Deuk-Young Han) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
This paper, we proposed the theoretical model which includes series resistance R<SUB>s</SUB> and shunt resistance R<SUB>sh</SUB> of single-crystalline PV module and used numerical method based on physics. Series resistance R<SUB>S</SUB> was derived from approach for p-n junction diode instead of established form obtained from the simulator with irradiance changes. Electrical output characteristics for PV modules to count the effect of R<SUB>s</SUB> were then studied. Finally simulation results were compared to experimental data leading to good agreement.
Exposure factors of cadmium for residents in an abandoned metal mine area in Korea
Ahn, Seung Chul,Chang, Jun Young,Lee, Jung Sub,Yu, Hwa Yon,Jung, A-Ra,Kim, Jee-Young,Choi, Jong-Woo,Hong, Young-Seoub,Do Yu, Seung,Choi, Kyounghee Science and Technology Letters 2017 Environmental geochemistry and health Vol.39 No.5
<P>This study evaluated blood and urine cadmium (Cd) levels and human exposure factors for residents in an abandoned metal mine in Korea. We collected blood, urine, soil, water, and rice grain samples to analyze Cd concentrations and analyzed heavy metal concentration patterns in soil. We estimated the major exposure factor of Cd through non-carcinogenic risk assessment depending on exposure routes. The blood Cd concentration in the case group was 5.33 μg/L (geometric mean), significantly higher than that in the control group (1.63 μg/L, geometric mean). Urine Cd concentrations were also similar. The Cd concentrations in paddy soil (1.29 mg/kg) and rice grains (0.14 mg/kg) in the study area were higher than those in the control area (0.91 and 0.07 mg/kg, respectively). The analysis of heavy metal concentration in soil showed that the Cd levels in agricultural soil in the case group were attributable to the mine. The hazard quotient (HQ) of Cd by rice ingestion in the case group (1.25) was 2 times higher than that in the control group (0.6). We found that the HQ of rice ingestion contributed to more than 97 % of the total HQ, indicating that rice grains were the major exposure source. However, it is likely that the continuous intake of Cd-exposed crops led to chronic exposure among the residents in mine area.</P>