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Kihyun Park,Byung-Il Min,Sora Kim,Jiyoon Kim,Kyung-Suk Suh 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.2(E)
북한은 2017년 9월 3일 풍계리 핵실험장에서 6차 지하 핵실험을 단행하였다. 이전에 수행했던 핵실험들과 달리 풍계리 핵 실험장 주변에서 몇 차례의 유발지진이 발생하였고 이로 인해 지하에 갇혀 있던 방사성제논이 대기 중으로 방출되는데 영향을 끼쳤을 것으로 예상된다. 본 연구에서는 북한의 6차 핵실험 이후에 발생한 유발지진을 고려하여 핵실험으로 발생한 방사성제논의 몇 가지 방출 시나리오에 따른 대기확산 모의실험을 본 연구진이 개발한 LADAS (Lagrangian Atmospheric Dose Assessment System) 모델에 기상청의 수치예보자료를 적용하여 수행하였다. 방사성제논의 가능한 검출 위치와 시간을 찾기 위해, 1일 간격 및 1주일 간격의 지연방출뿐만 아니라 유발지진으로 유출된 지연방출 시나리오도 설정하였다. 포괄 적핵실험금지조약기구(Comprehensive Nuclear-Test-Ban Treaty Organization)에서 운영중인 전세계관측망(International Monitoring System)과 원자력안전위원회의 133Xe 탐지 결과는 유발지진으로 유출된 방사성제논의 방출 시나리오에 따른 모의실험의 결과와 대체로 부합되었다. North Korea conducted the sixth underground nuclear test on September 3, 2017 at the Punggye-ri Nuclear Test Site (NTS). In contrast to the previous five nuclear tests, several induced earthquakes occurred around the NTS after the sixth nuclear test and this may have caused radioxenon leakages at the site. Considering these reported earthquakes, we performed atmospheric dispersion simulations on some radioxenon emission scenarios for this event using our Lagrangian Atmospheric Dose Assessment System (LADAS) model by employing the Unified Model (UM) based numerical weather prediction data produced by the Korea Meteorological Administration (KMA). To find out possible detection locations and times, we combined not only daily and weekly based delayed releases but also leakages after the reported earthquakes around the NTS to create emission scenarios. Our simulation results were generally in good agreement with the measured data of the Nuclear Safety and Security Commission and International Monitoring System (IMS) stations operated by the Comprehensive nuclear Test-Ban-Treaty Organization (CTBTO).
Kihyun Kim,Choi, Seong-Woo,Park, Jung Ock,Kim, Sung-Kon,Lim, Min-Young,Kim, Ki-Hyun,Ko, Taeyun,Lee, Jong-Chan Elsevier 2017 Journal of membrane science Vol.536 No.-
<P><B>Abstract</B></P> <P>Proton conductive porous substrates consisting of cross-linked benzoxazine-benzimidazole copolymers are developed for practical application of reinforced pore-filling membranes in polymer electrolyte membrane fuel cells operating at high-temperatures (>100°C) and low relative humidity (<50% RH) conditions. The porous proton conductive substrates are prepared by casting solution mixtures of sodium 3-(4-sulfonatophenyl-3,4-dihydro-2<I>H</I>-1,3 benzoxazine-6-sulfonate (<I>p</I>S) and poly[2,2′-(<I>m</I>-<I>p</I>henylene-5,5′-bibenzimidazole] (PBI) with dibutyl phthalate (DBP) as a porogen, followed by subsequent stepwise heating to 220°C and extraction of DBP from the P(<I>p</I>S-<I>co</I>-BI) films. The resulting porous substrates are found to have mechanically robust cross-linked structures, tunable hydrophilicity, and proton conductivity. A pore-filling membrane is prepared by impregnating the porous substrate with sulfonated poly(arylene ether sulfone) having the degree of sulfonation of 70mol%. The pore-filling membrane exhibits much improved dimensional stability and mechanical strength compared to the linear sulfonated poly(arylene ether sulfone) membrane and its proton conductivity and cell performance are found to be superior to the pore-filling membrane prepared using the porous substrate based on cross-linked benzoxazine-benzimidazole copolymers without any proton conductive acid groups.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Proton conductive benzoxazine having sulfonic acid groups was synthesized. </LI> <LI> Porous cross-linked benzoxazine-benzimidazole copolymer substrates were prepared. </LI> <LI> Tunable hydrophilicity, porosity and proton conductivity of porous substrates. </LI> <LI> Excellent physical stability and mechanical strength of pore-filling membrane. </LI> <LI> Outstanding cell performance of MEA prepared with the pore-filling membrane. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kihyun Park,Byung-Il Min,Sora Kim,Jiyoon Kim,Kyung-Suk Suh 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
As part of the third ATM Challenge, we performed a series of atmospheric dispersion simulations for routine releases of Xe-133 from ordinarily operating nuclear facilities such as Medical Isotope Production Facilities (MIPFs), Nuclear Power Plants (NPPs), and Research Reactors (RRs) in the Northern Hemisphere using our ATM, Lagrangian Atmospheric Dose Assessment System (LADAS), with Numerical Weather Prediction (NWP) data produced by the Korea Meteorological Administration (KMA). The simulation time period is 6 months, from June to November in 2014, and we used the stack emission data except for CNL (Canada) and IRE (Belgium) in accordance with the scenario of the third ATM Challenge 2019. In addition, the simulations were done individually for all MIPFs, NPPs, and RRs. We utilized 3-hourly KMA’s Unified Model Global Data Assimilation and Prediction System (UM-GDAPS) data with 0.35°×0.23° horizontal resolution as input meteorological fields and extracted hourly time series results for Xe-133 activity concentrations with few different resolutions such as 0.5°×0.5°, 0.35°×0.23°, and 0.1°×0.1° at several IMS stations in the Northern Hemisphere which were in normal operation in 2014. Considering previously reported values of daily Xe-133 release amounts for CNL and IRE, measured signals at some IMS stations (such as CAX17, DEX33, SEX63, and USX75) were well reproduced from the simulation results.
Kim, Kihyun,Bae, Jungmoon,Lim, Min-Young,Heo, Pilwon,Choi, So-Won,Kwon, Heock-Hoi,Lee, Jong-Chan Elsevier 2017 Journal of membrane science Vol.525 No.-
<P><B>Abstract</B></P> <P>Sulfonated poly(arylene ether sulfone) (SPAES) composite membranes were prepared using antioxidant grafted graphene oxide as a filler for polymer electrolyte membrane fuel cell (PEMFC) applications. SPAES was synthesized <I>via</I> condensation polymerization of 4,4′-dihydroxybiphenyl, 4,4′-dichlorodiphenylsulfone and 3,3′-disulfonate-4,4′-dichlorodiphenylsulfone. The antioxidant grafted graphene oxide was prepared by grafting hindered amine, 4-amino-2,2,6,6-tetramethylpiperidine, onto the surface of graphene oxide (GO). The SPAES composite membrane containing the antioxidant grafted GO showed improved physicochemical properties such as mechanical strength, chemical and thermal stabilities, and proton conductivity compared to pristine SPAES membrane. In particular, the antioxidant grafted GO was much more effective in enhancing the chemical stability of SPAES than GO without the antioxidant. For example after Fenton's test, the SPAES composite membrane with grafted antioxidant showed smaller decrease of both the weight and proton conductivity values than the pristine SPAES and SPAES composite membrane with GO. The enhanced chemical stability of SPAES composite membrane with antioxidant grafted GO can be explained by the combined antioxidant effect of both grafted antioxidant functional groups and GO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> SPAES composite membranes were prepared using antioxidant grafted GO as filler. </LI> <LI> Excellent chemical and physical stabilities of SPAES composite membranes. </LI> <LI> Proton conductivity of the composite membranes was highly increased. </LI> <LI> Proton conductivity of the composite membranes after Fenton's test was enhanced. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
CAN Communication을 이용한 CAR AV System 도난 방지 기능 구현에 관한 연구
박민수(Min-su.Park),정기현(Kihyun.Chung) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
This paper proposes an algorithm to improve the anti-theft function of the CAR_A V using the CAN (Controller Area Network) communication between CAR AV and cluster. Compare to the typical anti-theft algorithms like security code entering, the proposed one is more secure in most cases. The proposed algorithm is suitable for the recent automobile that employ the CAN network as the communication channel between their devices.
The Structure of Compatibility Beliefs In Mobile Entertainment Service Adoption
Gyeung-Min Kim,Kihyun Kim,Hyunjung Lee 한국데이타베이스학회 2013 Journal of information technology applications & m Vol.20 No.1
Noting that compatibility beliefs are important antecedents of technology adoption, the objective of this study was to assess compatibility beliefs that affect users’ intention to adopt a mobile entertainment service (MES). We developed a set of key compatibility beliefs: compatibility with life-style, compatibility with social meaning, and compatibility with past flow experiences. We then defined the key dimensions of each construct and developed operational measures for those dimensions. We tested the theorized effects of each of the compatibility constructs on MES adoption. The results support the effects of compatibility beliefs on users’ intentions to adopt MES.
Son, Kihyun,Hwang, Soo Min,Woo, Seok-Gyun,Paik, Meenseon,Song, Eui Hwan,Kim, Young-Jun Elsevier 2019 Journal of Power Sources Vol.440 No.-
<P><B>Abstract</B></P> <P>Understanding the thermal behavior of the solid-electrolyte interphase (SEI) is important for ensuring the overall safety and reliability of Li-ion batteries (LIBs). However, it is difficult to detect intrinsic exothermic heat flows from metastable SEI species during typical thermal characterization because of the high heat capacity of other cell components, such as active materials, binders, and current collectors, in samples. Here, we report a new approach to thermal and chemical characterization of the SEI on LIB anodes. By sampling the separator containing a top part of the SEI from cycled cells (graphite|LiCoO<SUB>2</SUB>), and conducting differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy, we found that the SEI on the detached separator consisted mainly of metastable organic components, such as polycarbonates and Li alkyl carbonates, which were accumulated over repeated cycles and responsible for large amounts of exothermic signals at low temperatures, as shown in the DSC curves. These findings show that our sampling method enables a detailed thermal analysis on the metastable SEI alone, which can result in self-heating of cells under typical usage conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new method for solid-electrolyte interphase (SEI) characterization is proposed. </LI> <LI> SEI-containing separators are prepared by detaching them from cycled cells. </LI> <LI> The detached SEI/separators show clear exothermic heat flows at low temperatures. </LI> <LI> The SEI mainly consists of metastable polycarbonates and Li alkyl carbonates. </LI> </UL> </P>