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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.
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.
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.-
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>
Design and Analysis of a Solenoid Valve for Submarine Direction Control
Jun-Yeop Lee(이준엽),Byeong-Soo Go(고병수),Sang-Ho Kim(김상호),Hyun-Jin Ha(하현진),Minwon Park(박민원) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
The solenoid valve used in a submarine direction control system consists of a solenoid coil, a coil core, a housing surrounding the outer of the coil, and a plunger as a driving part. The solenoid valve is a device that uses the magnetic force generated from the applied power to move the plunger, the driving part inside the valve, to control the flow of fluid. Therefore, the magnetic properties and structure of each part of the solenoid valve greatly affect the performance of this valve. In this paper, considering the material characteristics of each part of the solenoid valve, the design of the solenoid valve for a submarine direction change and the electromagnetic finite element numerical analysis applying the two-dimensional axisymmetric shape were performed.
Modelling and Transient Analysis of a 3-Phase Multi-Layer HTS Coaxial Cable using PSCAD/EMTDC
Jun-Yeop Lee(이준엽),Seok-Ju Lee(이석주),Minwon Park(박민원) 한국산업정보학회 2020 한국산업정보학회논문지 Vol.25 No.1
3상 다층 고온 초전도 동축 케이블은 초전도 선재 사용량의 감소 및 케이블의 소형화와 같은 이점 때문에 활발히 연구되고 있다. 3상 다층 고온 초전도 동축 케이블의 전기적 특성은 기존 초전도 케이블과 차이를 가지므로 실제 시스템에 적용하기 위해 충분한 분석이 필요하다. 본 논문에서는 PSCAD/EMTDC 기반 시뮬레이션을 통하여 22.9 kV, 60 MVA급 3상 다층 고온 초전도 동축 케이블을 모델링하고 과도 특성을 분석하였다. 결과적으로 3상 다층 고온 초전도 동축 케이블에서 고장전류가 발생하면 대부분의 고장전류가 구리 포머층을 통해 우회한다. 이때, 케이블 전체 온도는 약 5 K증가하였다. 본 논문을 통해 3상 다층 고온 초전도 동축 케이블의 과도 상태에 대한 신뢰성을 확인할 수 있으며 향후 케이블의 실 계통 적용에 도움이 될 수 있다. Three-phase multi-layer high temperature superconducting coaxial (TPMHTSC) cable is being actively studied due to advantages such as the reduction of the amount of superconducting wire usage and the miniaturization of the cable. The electrical characteristics of TPMHTSC cables differ from those of conventional superconducting cables, so sufficient analysis is required to apply them to the actual system. In this paper, the authors modeled 22.9 kV, 60 MVA TPMHTSC cable and analyzed the transient characteristics using a PSCAD/EMTDC-based simulation. As a result, when a fault current flows in TPMHTSC cable, most of the fault current is bypassed through the copper former layers. At this time, the total cable temperature increased by about 5 K. Through this study, we can verify the reliability of the TPMHTSC cable against the transient state, and it can be helpful for the practical application of the cable in the future.
Lee, Yongjae,Lee, Yongmoon,Seoung, Donghoon,Im, Jun‐,Hyuk,Hwang, Hee‐,Jung,Kim, Tae‐,Hyun,Liu, Dan,Liu, Zhenxian,Lee, Seung Yeop,Kao, Chi‐,Chang,Vogt, Thomas WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.20
<P><B>Hochdruck‐Ionenaustausch</B> an dem kleinporigen Zeolith K‐Natrolit ermöglicht die Immobilisierung von nominell nicht austauschbaren aliovalenten Kationen wie dreiwertigem Europium. Eine Probe, an der bei 3.0(1) GPa und 250 °C ein Ionenaustausch vorgenommen wurde, enthält ungefähr 4.7 Eu<SUP>III</SUP>‐Ionen pro Elementarzelle, was einem Austausch von über 90 % der K<SUP>+</SUP>‐Ionen entspricht (siehe Bild).</P>