수송용 에너지산업 규제개혁을 통한 신성장동력 창출방안 모색

전재완(Jaewan Jeon),최동원,김민지,김성진,제상영 산업연구원 2016 연구보고서 Vol.- No.-

저 준위 액체섬광계수기를 이용한 섬광체 종류에 따른 ²²²Rn 농도 변화 연구

전재완 ( Jaewan Jeon ),이득희 ( Deuk-hee Lee ),김진섭 ( Jin-seop Kim ) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.6

오늘날 경제의 발전과 함께 여러 가지 환경 문제가 발생했다. 자연스레 사람들은 환경에 대한 관심이 높아졌으며 특히 식수에 대한 안전성과 오염도 조사에 대한 중요성이 부각되고 있다. 우리나라 국민들이 식수로 이용하는 지하수에서 우라늄 및 ²²²Rn 이 다수 지역에서 검출되고 있다. 따라서 이 연구는 지하수 내 포함된 ²²²Rn 농도를 측정하는데 보다 정확한 측정을 위한 방법을 알아보고자 한다. 실험은 알파, 베타 펄스의 분석이 용이한 펄스파형분석 기능을 가진 저 준위 액체섬광계수기를 이용하여 실험하였다. 지하수 시료와 혼합하는 섬광체의 조제, 유효기간은 시간이 지날수록 검출값은 낮아지고, 에너지 스펙트럼도 낮은 쪽으로 channel 이동이 있었다. 섬광체의 구입시기가 오래 될수록, 개봉한 후 방치시간이 지날수록 검출값이 낮아짐을 확인했다. 사용목적이 다른 섬광체를 사용했을 경우 channel 이동으로 에너지를 확인할 수 있다. The various environmental issues arose with the development of today's economy. naturally, people were increased interest in environment and the importance of research on drinking water and contamination are emerging especially. A number of country areas, uranium and ²²²Rn in ground water have been detected to people using as drinking water. So this study evaluated the way for more accurate measurements than when measuring ²²²Rn concentrations in the ground water containing. the experiment was performed using the low-level liquid scintillation counter with an alpha, beta analysis easy PSA function of pulse. the scintillator as the preparation of the ground water samples are mixed, the measure value detection is lowered over prepare period and expiration date. Energy spectrum was also moved to a lower side channel. As a long time to buy the scintillator and over time after opening, it was confirmed that detection is lowered. if the purpose is to use a different scintillator can see the energy through the channel change.

Study on Concentration Variation of ²²²Rn for Various Scintillators Using Low-Level Liquid Scintillation Counter

전재완(JaeWan Jeon),이득희(Deuk-Hee Lee),김진섭(Jin-Seop Kim) 한국방사선학회 2019 한국방사선학회 논문지 Vol.13 No.6

오늘날 경제의 발전과 함께 여러 가지 환경 문제가 발생했다. 자연스레 사람들은 환경에 대한 관심이 높아졌으며 특히 식수에 대한 안전성과 오염도 조사에 대한 중요성이 부각되고 있다. 우리나라 국민들이 식수로 이용하는 지하수에서 우라늄 및 ²²²Rn 이 다수 지역에서 검출되고 있다. 따라서 이 연구는 지하수 내 포함된 ²²²Rn 농도를 측정하는데 보다 정확한 측정을 위한 방법을 알아보고자 한다. 실험은 알파, 베타 펄스의 분석이 용이한 펄스파형분석 기능을 가진 저 준위 액체섬광계수기를 이용하여 실험하였다. 지하수 시료와 혼합하는 섬광체의 조제, 유효기간은 시간이 지날수록 검출값은 낮아지고, 에너지 스펙트럼도 낮은 쪽으로 channel 이동이 있었다. 섬광체의 구입시기가 오래 될수록, 개봉한 후 방치시간이 지날수록 검출값이 낮아짐을 확인했다. 사용목적이 다른 섬광체를 사용했을 경우 channel 이동으로 에너지를 확인할 수 있다. The various environmental issues arose with the development of today s economy. naturally, people were increased interest in environment and the importance of research on drinking water and contamination are emerging especially. A number of country areas, uranium and ²²²Rn in ground water have been detected to people using as drinking water. So this study evaluated the way for more accurate measurements than when measuring ²²²Rn concentrations in the ground water containing. the experiment was performed using the low-level liquid scintillation counter with an alpha, beta analysis easy PSA function of pulse. the scintillator as the preparation of the ground water samples are mixed, the measure value detection is lowered over prepare period and expiration date. Energy spectrum was also moved to a lower side channel. As a long time to buy the scintillator and over time after opening, it was confirmed that detection is lowered. if the purpose is to use a different scintillator can see the energy through the channel change.

The effect of ozone concentration during atomic layer deposition on the properties of ZrO₂ films for capacitor applications

Song, Hyoseok,Jeon, Heeyoung,Shin, Changhee,Shin, Seokyoon,Jang, Woochool,Park, Joohyun,Chang, Jaewan,Choi, Jae Hyoung,Kim, Younsoo,Lim, HanJin,Seo, Hyungtak,Jeon, Hyeongtag Elsevier S.A. 2016 Thin Solid Films Vol.619 No.-

<P><B>Abstract</B></P> <P>In this study, we report the effect of process conditions on the crystallinity and energy band structure of atomic layer deposition (ALD) ZrO<SUB>2</SUB> films deposited, using tris(dimethylamino) cyclopentadienyl zirconium as a precursor and ozone as a reactant. ZrO<SUB>2</SUB> films exhibited systematic changes in phase and energy band gap as a function of the ozone concentration. The crystal phase was transformed from the monoclinic phase to a tetragonal phase in the presence of higher ozone concentrations. In addition, spectroscopic ellipsometry measurements showed that the optical band gap and oxygen vacancy defects decreased with increasing ozone concentration. The valence band maximum also shifted closer to the Fermi energy level with increasing ozone concentration. The change in electronic structure driven by a high concentration of ozone led to reduced leakage current density and a high dielectric constant in the ZrO<SUB>2</SUB>-based metal-insulator-metal capacitors. These improvements were not observed for depositions performed using conventional ZrO<SUB>2</SUB> ALD with oxygen and water reactants.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We report the effect of ozone concentration on the properties of ZrO<SUB>2</SUB> thin films. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> transformed from a monoclinic phase to a tetragonal phase. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> concentration showed the reduced leakage current. </LI> <LI> The ZrO<SUB>2</SUB> at higher O<SUB>3</SUB> concentration showed the higher dielectric constant. </LI> </UL> </P>

Depth resolved band alignments of ultrathin TiN/ZrO₂and TiN/ZrO₂-Al₂O₃-ZrO₂dynamic random access memory capacitors

Lee, Sang Yeon,Chang, Jaewan,Kim, Younsoo,Lim, HanJin,Jeon, Hyeongtag,Seo, Hyungtak American Institute of Physics 2014 Applied Physics Letters Vol.105 No.20

Investigation of ultrathin Pt/ZrO₂–Al₂O₃–ZrO₂/TiN DRAM capacitors Schottky barrier height by internal photoemission spectroscopy

Lee, Sang Yeon,Chang, Jaewan,Choi, Jaehyung,Kim, Younsoo,Lim, HanJin,Jeon, Hyeongtag,Seo, Hyungtak ELSEVIER 2017 Current Applied Physics Vol.17 No.2

<P>We report the Schottky barrier height (SBH) at metal-insulator interfaces in Pt/ZrO2-Al2O3-ZrO2(ZAZ)/TiN dynamic random access memory capacitors by analyzing the photoconductivity yield and internal photoemission (IPE) yield using IPE spectroscopy. The SBH values at the Pt/ZAZ and ZAZ/TiN interfaces in the Pt/ZAZ/TiN stack were found to be 2.77 and 2.18 eV, respectively. The SBH difference between the top electrode/oxide and bottom electrode/oxide interfaces is related to the work function difference between Pt and TiN, and the subgap defect state features (density and energy) of the given dielectric. By combining experimental analysis using IPE at the device level and ultraviolet photoelectron spectroscopy and spectroscopic ellipsometry at the film level, a band structure model is proposed. (C) 2016 Elsevier B.V. All rights reserved.</P>

어린이 보호용 좌석의 고정 방식에 따른 탑승자 안전도 향상 방안 연구

윤영한(Younghan Youn),이재완(Jaewan Lee),전준호(Junho Jeon),양재의(Jaeeui Yang),이정선(Jeongsun Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2

Since US adopt a requirement for universal, uniform anchor systems for child restraints, an enormous effort of some child seat manufacturers tried to improve the protective properties of Child Restraint System(CRS). The new standard includes FMVSS 225, Child Restraint Anchorage Systems and amendments to FMVSS 213 is effective in 1999. The universal anchor rule will provide devices independent of safety belts to attach child restraints to the vehicle. It will allow child restraints to be anchored more securely than is often possible with current safety belts. Currently, US, Australia and european comnmunity countries including Japan started testing of evaluation of CRS performances during their NCAP test programs and results are published.<br/> Korean government realized the impormance of CRS roles in child safety and investigate benefits of enhancement of CRS regulations. In this study, a series of numerical simulation because of lacks of ISOFIX ready CRS in the domestic market, is conducted to evaluated the different types of ISOFIX methods.<br/>

Decreased Hepatic Lactotransferrin Induces Hepatic Steatosis in Chronic Non-Alcoholic Fatty Liver Disease Model

Lee, Sungmin,Son, Beomseok,Jeon, Jaewan,Park, Gaeul,Kim, Hyunwoo,Kang, Hyunkoo,Youn, HyeSook,Jo, Sunmi,Song, Jie-Young,Youn, BuHyun S. Karger AG 2018 Cellular physiology and biochemistry Vol.47 No.6

<P><B><I>Background/Aims:</I></B> Non-alcoholic fatty liver disease (NAFLD) is an emerging metabolic disease. Although it leads to severe hepatic diseases including steatohepatitis, cirrhosis, and hepatic cancer, little is known about therapy to prevent and cure hepatic steatosis, the first step of NAFLD. We conducted this investigation to unveil the mechanism of hepatic steatosis. <B><I>Methods:</I></B> We established a novel chronic NAFLD mouse model through whole body irradiation and verified the model through histological and biochemical analysis. To find molecular mechanism for hepatic steatosis, we analyzed hepatic transcriptomic profiles in this model and selected target molecule. To induce the expression of lactotransferrin (Ltf) and regulate the NAFLD, growth hormone (GH) and coumestrol was introduced to hepatocyte and mice. The universal effect of coumestrol was confirmed by administration of coumestrol to NAFLD mouse model induced by high-fructose, high-fat, and MCD diet. <B><I>Results:</I></B> It was observed that decreased hepatic Ltf expression led to excessive hepatic lipid accumulation in NAFLD mouse. Furthermore, we found that GH was decreased in irradiated mice and functioned as an upstream regulator of Ltf expression. It was observed that GH could stimulate Ltf expression and prevent uptake of dietary lipids in hepatocytes, leading to rescue of NAFLD. Finally, we suggested that coumestrol, a kind of isoflavonoid, could be used as an inducer of hepatic Ltf expression through cooperation with the GH signaling pathway both <I>in vitro</I> and <I>in vivo</I>. <B><I>Conclusions</I></B><I>:</I> Hepatic Ltf prevents hepatic steatosis through inhibition of dietary lipid uptake in radiation-induced NAFLD mouse model. We also suggest coumestrol as a drug candidate for prevention of NAFLD.</P>

좌측 유방암의 방사선치료 자세와 선량인자의 상관관계 분석

전재완,박철우,홍종수,진성진,강정훈,Jeon, Jaewan,Park, Cheolwoo,Hong, Jongsu,Jin, Seongjin,Kang, Junghun 대한방사선치료학회 2017 대한방사선치료학회지 Vol.29 No.1

목 적: 방사선치료의 가장 기본적인 조건은 정상조직의 불필요한 피폭을 방지하는 것이다. 유방암의 경우는 폐와 심장에 조사되는 선량이 중요하게 평가되는 인자이다. 따라서 유방암 방사선치료 자세에 따른 정상조직에 조사되는 선량을 비교하고 그 연관성을 상관관계 분석을 통하여 결과를 확인하여 보다 효과적인 유방암 방사선 치료방법을 모색하고자 한다. 대상 및 방법: 본원을 내원한 좌측 유방암 환자 30명을 대상으로 Supine, Prone Position에서 CT image를 획득하였다. Eclipse Treatment Planning System(Version 11, USA)을 이용하여 전산화치료계획을 수립하였다. DVH(Dose Volume Histogram)을 통해 Position 별로 정상조직에 조사된 선량을 비교하였다. 그 결과를 바탕으로 SPSS(Version 18)을 이용하여 각 정상조직의 선량인자를 통계분석하고 항목 간 상관관계 분석 및 독립표본 t-test를 통하여 그 연관성을 알아보았다. 그리고 MIRADA RTx(Version Advanced 1.6, UK)를 이용하여 HI(Homogeneity Index)와 CI(Conformity Index)를 Supine, Prone Position에서 값을 구하고 비교하였다. 결 과: 유방암의 전산화치료계획의 결과 폐의 경우는 Supine Position에서 V20은 $16.5{\pm}2.6%$, V30은 $13.8{\pm}2.2%$, Mean dose는 $779.1{\pm}135.9cGy$(Absolute value)를 보였다. Prone Position은 위 순서대로 $3.1{\pm}2.2%$, $1.8{\pm}1.7%$, $241.4{\pm}138.3cGy$를 보였다. Prone Position이 전반적으로 낮은 선량을 나타내었고 평균선량 537.7 cGy가 더 적게 폐에 조사되었다. 심장의 경우에는 Supine, Prone 순서대로 V30은 $8.1{\pm}2.6%$, $5.1{\pm}2.5%$, Mean dose는 $594.9{\pm}225.3cGy$, $408{\pm}183.6cGy$를 보였다. Prone Position에서 평균선량 182.6 cGy가 더 적게 조사된다는 것을 확인하였다. 통계분석 결과 신뢰도 분석지표인 Cronbach's Alpha value는 0.563이였고 변수간의 상관관계분석 결과 치료자세와 폐의 선량평가인자는 대략 0.89 이상으로 그 상관관계가 높았다. 반면 심장의 경우는 V30은 0.488, Mean dose는 0.418로 상관관계가 다소 적었다. 마지막으로 독립표본 t-test 결과 치료자세와 폐, 심장의 선량평가인자가 신뢰수준 99 %에서 모두 유의하게 나타났다($p-value{\leq}0.05$). 결 론: 현재 방사선치료는 최첨단 선형가속기와 다양화된 전산화치료계획 기술이 개발되고 있다. 이 발전의 기본전제 조건은 PTV(Planning Target Volume) 주위의 정상조직 보호라고 생각한다. 물론 유방암 환자를 Prone Position에서 치료하면 Set-up의 재현성 문제와 다소 많은 시간이 소요되지만 이 실험결과에서 보듯이 Prone Position에서 폐와 심장에 들어가는 선량을 줄일 수 있으며 그 연관관계도 의미가 있다는 것을 확인하였다. 결론적으로 Prone Position에서 충분한 치료시간을 확보하고 정확한 치료부위 확인이 이루어진다면 환자에게 보다 좋은 방사선치료를 제공할 수 있다고 생각된다. Purpose: The most basic conditions of radiation therapy is to prevent unnecessary exposure of normal tissue. The risk factors that are important o evaluate the dose emitted to the lung and heart from radiation therapy for breast cancer. Therefore, comparing the dose factors of a normal tissue according to the radion treatment position and Seeking an effective radiation treatment for breast cancer through the analysis of the correlation relationship. Materials and Methods: Computed tomography was conducted among 30 patients with left breast cancer in supine and prone position. Eclipse Treatment Planning System (Ver.11) was established by computerized treatment planning. Using the DVH compared the incident dose to normal tissue by position. Based on the result, Using the SPSS (ver.18) analyzed the dose in each normal tissue factors and Through the correlation analysis between variables, independent sample test examined the association. Finally The HI, CI value were compared Using the MIRADA RTx (ver. ad 1.6) in the supine, prone position Results: The results of computerized treatment planning of breast cancer in the supine position were V20, $16.5{\pm}2.6%$ and V30, $13.8{\pm}2.2%$ and Mean dose, $779.1{\pm}135.9cGy$ (absolute value). In the prone position it showed in the order $3.1{\pm}2.2%$, $1.8{\pm}1.7%$, $241.4{\pm}138.3cGy$. The prone position showed overall a lower dose. The average radiation dose 537.7 cGy less was exposured. In the case of heart, it showed that V30, $8.1{\pm}2.6%$ and $5.1{\pm}2.5%$, Mean dose, $594.9{\pm}225.3$ and $408{\pm}183.6cGy$ in the order supine, prone position. Results of statistical analysis, Cronbach's Alpha value of reliability analysis index is 0.563. The results of the correlation analysis between variables, position and dose factors of lung is about 0.89 or more, Which means a high correlation. For the heart, on the other hand it is less correlated to V30 (0.488), mean dose (0.418). Finally The results of independent samples t-test, position and dose factors of lung and heart were significantly higher in both the confidence level of 99 %. Conclusion: Radiation therapy is currently being developed state-of-the-art linear accelerator and a variety of treatment plan technology. The basic premise of the development think normal tissue protection around PTV. Of course, if you treat a breast cancer patient is in the prone position it take a lot of time and reproducibility of set-up problems. Nevertheless, As shown in the experiment results it is possible to reduce the dose to enter the lungs and the heart from the prone position. In conclusion, if a sufficient treatment time in the prone position and place correct confirmation will be more effective when the radiation treatment to patient.

Biocidal effect of thymol and carvacrol on aquatic organisms: Possible application in ballast water management systems

Kim, Hyunwoo,Lee, Sungmin,Son, Beomseok,Jeon, Jaewan,Kim, Daehoon,Lee, wonku,Youn, HyeSook,Lee, Jae-Myung,Youn, BuHyun Elsevier 2018 MARINE POLLUTION BULLETIN Vol.133 No.-

<P><B>Abstract</B></P> <P>Ballast water is essential for maintaining the balance and integrity of a ship. However, exchanging ballast water resulted in discharging water of different origins in vessel recipient ports, and this may have caused ecosystem disturbance or aquatic pollution. The ballast water management (BWM) system is essential for the purification and disinfection of the ballast water that is taken up. Because current BWM systems widely use biocides for the treatment of aquatic organisms, the biocides may result in unintended toxicity of the discharged ballast water. In this study, we suggested thymol and carvacrol as chemical biocides for BWM systems and investigated their effectiveness using <I>Artemia salina</I> and <I>Escherichia coli</I>. Thymol and carvacrol showed biocidal effects in our study. A combination of these substances showed a synergistic increase in the biocidal effects. Moreover, carvacrol naturally degrades after disinfection, which indicates that natural substances may be promising candidates to increase the efficacy and reduce unwanted side effects of the BWM system.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thymol showed specifically high biocidal effect on <I>Artemia salina</I> </LI> <LI> Carvacrol showed specifically high biocidal effect on <I>Escherichia coli</I> </LI> <LI> Combination treatment of thymol and carvacrol showed synergistic biocidal effects </LI> <LI> Carvacrol naturally degraded and lost biocidal effect in 4 days </LI> </UL> </P>