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김도균,이준호,유승엽,장정수,권영수 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
The electrical properties of Maleate copolymer (C_(18)MA-VE_(2)) and Itaconate copolymer (C_(18)ITA-VE_(2)) Langmuir-Blodgett (LB) films for in-plane were investigated to develop the gas sensor. The C_(18)MA-VE_(2) and C_(18)ITA-VE_(2) were used as sensitive materials and deposition on the slide-glass substrate using LB method which could control the thickness in the molecular order (Å). The current-voltage (I-V) characteristics were measured to investigated the response characteristics in chloroform, acetone, ethanol and methanol gases. The conductivity of sensitive films were 10^(-)7[S/cm] for an in-plane. The change of conductivity was occurred by behavior of organic gases, which mean that the behavior of organic gases could be analyzed using conductivity change and application to gas sensor. In the experimental results, the relation between sensitive films and organic gases could be divided by three-type. Thus, we could analyze the modeling of the response characteristics of organic gases using the conductivity change of sensitive films.
Comparative Competitive Analysis of Logistics Companies in Korea, Japan and China
Jun-Yeop Lee,Myung-Hun Lee 인하대학교 정석물류통상연구원 2011 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.9 No.1
This paper examines the comparative corporate performance of logistics companies in Korea, China and Japan. Based on the annual data from the listed companies, the growth rate of Chinese companies has surpassed that of Korean and Japanese companies and has labeled China as the fastest growing economy. How ever, labor efficiency of Chinese firms when calculated by total revenue per employee is the lowest of the three countries. In addition, the profitability of Chinese multimodal logistics companies and sea transport companies is also lower than that of Korea and Japan. Using Data Envelop Analysis(DEA), the primary results regarding corporate efficiency among Korean, Chinese and Japanese logistic companies are as follows: In the multimodal industries, Japanese firms have revealed the highest level of efficiency, with Korean firms coming in second, and Chinese firms ranking third with distinctly inferior performance. This trend has also been examined in the maritime industries, in which the efficiency levels have been deteriorating continuously. However, in the air transportation industry Chinese companies revealed the highest level of efficiency, which resulted from the business characteristics of the government supported conglomerate companies.
Lee, Jun-Yeop,Vespa, Marika,Gaona, Xavier,Dardenne, Kathy,Rothe, Jö,rg,Rabung, Thomas,Altmaier, Marcus,Yun, Jong-Il De Gruyter 2017 RADIOCHIMICA ACTA Vol.105 No.3
<P><B>Abstract</B></P><P>The formation of ternary Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes under weakly alkaline pH conditions was investigated by time-resolved laser fluorescence spectroscopy (TRLFS) and extended X-ray absorption fine structure (EXAFS) and compared to Ca-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes. The presence of two different Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes was identified by means of two distinct fluorescence lifetimes of 17±2 ns and 51±2 ns derived from the multi-exponential decay of the fluorescence signal. Slope analysis in terms of fluorescence intensity coupled with fluorescence intensity factor as a function of log [Mg(II)] was conducted for the identification of the Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes forming. For the first time, the formation of both MgUO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB><SUP>2−</SUP>and Mg<SUB>2</SUB>UO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB>(aq) species was confirmed and the corresponding equilibrium constants were determined as log β<SUP>0</SUP><SUB>113</SUB>=25.8±0.3 and log β<SUP>0</SUP><SUB>213</SUB>=27.1±0.6, respectively. Complementarily, fundamental structural information for both Ca-UO<SUB>2</SUB>-CO<SUB>3</SUB>and Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes was gained by extended EXAFS revealing very similar structures between these two species, except for the clearly shorter U-Mg distance (3.83 Å) compared with U-Ca distance (4.15 Å). These results confirmed the inner-sphere character of the Ca/Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes. The formation constants determined for MgUO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB><SUP>2−</SUP>and Mg<SUB>2</SUB>UO<SUB>2</SUB>(CO<SUB>3</SUB>)<SUB>3</SUB>(aq) species indicate that ternary Mg-UO<SUB>2</SUB>-CO<SUB>3</SUB>complexes contribute to the relevant uranium species in carbonate saturated solutions under neutral to weakly alkaline pH conditions in the presence of Mg(II) ions, which will induce notable influences on the U(VI) chemical species under seawater conditions.</P>
Effectiveness of pharmacopuncture for cervical spondylosis: A systematic review and meta-analysis
Lee, Sungyub,Shin, Joon-Shik,Lee, Jinho,Ha, In-Hyuk,Kim, Me-riong,Koh, Wonil,Lee, Sook-Hyun,Kim, Seoyoun,Cha, Yun-Yeop,Lee, Jun-Hwan,Jang, Bo-Hyoung,Lee, Yoon Jae ELSEVIER SCIENCE B.V. 2018 European journal of integrative medicine Vol.20 No.-
Inter-Provincial Railroad Network in China
Jun-Yeop Lee,Shuyun Wang 인하대학교 정석물류통상연구원 2012 JOURNAL OF INTERNATIONAL LOGISTICS AND TRADE Vol.10 No.2
Using Social Network Analysis (SNA), this paper examines the inter-provincial logistics relationships in China. Based on the annual data of inter-provincial railway logistics quantity during the period 1998-2009, the degree of interconnection between regions could imply intensified trends of regional economic integration. The main results of the logistic relationships in China are as follows: the regional logistic interconnection, especially between western and eastern China has increased continuously, which would imply a rising national economic integration. However, the increased centralization index and the average Degree Centrality level imply that a logistics bottleneck has intensified in several hub provinces. Secondly, logistic center provinces evaluated by the Degree Centrality have changed. In 2009, Hebei, Liaoning, Jiangsu, Shandong, Henan and Sichuan provinces revealed the highest inward Degree Centrality. Sichuan Province is the region that most surprisingly increased its centrality. Thirdly, the number of logistic hub provinces, evaluated by the Degree Betweenness Centrality, has increased. In 2008, Henan province was only a focal hub but in 2009, Shandong, Hubei, Sichuan provinces became logistic hubs. Lastly, the Community Modularity which analyzed grouping structures shows that there are three time-consistent communities. This means that even though there is enhanced between-region integration, the inter-regional inter-connection is more important in explaining the regional logistic relationship.
( Jun Yeop Lee ),( Sung Eun Kim ),( Seun Ja Park ),( Moo In Park ),( Won Moon ),( Jae Hyun Kim ),( Kyoungwon Jung ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.2
Background/Aims: Helicobacter pylori infection is presumably associated with iron deficiency and iron deficiency anemia (IDA). This study aimed to evaluate the relationship between H. pylori infection and the decline in iron stores in non-elderly adults during their health check-ups. Methods: We identified a total of 1,069 subjects who were tested for iron, ferritin, and total iron-binding capacity during their health check-ups, from January 2016 to May 2017. Of these, subjects who underwent endoscopy via rapid urease test and those aged 65 years or below were finally enrolled. Results: Overall, 281 subjects were enrolled, and 187 patients (66.5%) tested positive for H. pylori. The mean age was 36.1 years (range, 22 to 65), and 176 subjects (62.6%) were male. The mean levels of hemoglobin (14.1 ± 1.7 g/dL vs. 14.6 ± 1.4 g/dL, p = 0.019) and ferritin (121.7 ± 106.9 ng/mL vs. 151.8 ± 107.8 ng/mL, p = 0.027) in the H. pylori-positive group were significantly lower than those in the H. pylori-negative group. Iron deficiency (ferritin < 30 ng/mL) was more common in patients with H. pylori infection (p = 0.002). There was no significant difference in anemia (hemoglobin < 13 g/dL in men, < 12 g/dL in women) or IDA (anemia, ferritin < 10 ng/mL, and transferrin saturation < 16%) with H. pylori. Logistic regression analysis demonstrated that female sex (odds ratio, 197.559; 95% confidence interval, 26.461 to 1,475.015) and H. pylori infection (odds ratio, 3.033; 95% confidence interval, 1.216 to 7.567) were factors associated with iron deficiency. Conclusions: H. pylori infection is associated with iron deficiency, suggesting a decline in iron stores among infected non-elderly adults.