Analysis of R&D Program Trends in Hydrogen Field Using National R&D Information on NTIS Services

Jaekyung Yoo,Kikwan Koo,Wookhyun Lee 한국신재생에너지학회 2022 AFORE Vol.2022 No.9

강원 영서지역 산사태 및 강우특성 분석

유남재(Yoo, Namjae),윤대희(Yoon, Daehee),엄재경(Um, Jaekyung),김동건(Kim, Donggun),박병수(Park, Byungsoo) 한국지반환경공학회 2012 한국지반환경공학회논문집 Vol.13 No.9

본 논문은 2006년 태풍 에위니아와 빌리스의 영향으로 강원 영서지역에서 발생한 집중호우에 의한 산사태 발생 원인과 특성에 대하여 분석한 결과이다. 강원 영서지역은 편마암, 화강암이 풍화된 화강풍화토가 주를 이루는 지역으로 집중호우 시 산사태 및 토석류의 피해에 취약한 것으로 나타났으며 강우특성 분석결과, 산사태 발생은 3일 이내의 누적강우량과 밀접한 관계가 있었고 지역별 발생빈도의 차이는 최대시우량의 영향으로 나타났다. 영서지역에서 발생한 산사태 860개소에 대한 자료의 분석 결과, 파괴형태는 전이형 슬라이드로 시작되어 유동성 슬라이드로 변화되는 양상을 보였으며, 사면 경사는 20~30°, 사면 길이는 11~20m 범위, 사면 폭은 6~10m 범위에서 발생빈도가 높은 것으로 나타났고, 영서지역의 산사태는 사면 폭이 좁은 소규모 형태로 편마암, 화강암 지대의 산사태 전형으로 분석되었다. This paper is the results of analysis for the causes and characteristics of landslide according to heavy rain occurred in west area of Gangwon province which is affected by typhoon such as Ewiniar and Bilis in 2006. West side of Gangwon province is topographically weak for the landslide and debris flow since it is covered by soil of weathered rock such as Gneiss and Granite. From the results of analysis for the rainfall characteristics, it was found that landslide occurrence is closely related to the accumulated rainfall amount less than 3 days. Furthermore, it was found that regional difference of occurrence frequency is effected by 1-hour maximum rainfall intensity. From the results of analysis for the landslide data of 860 locations occurred in west side, it was shown that failure mode was changed from transition slide to liquidity slide. Occurrence frequency was high at the slope angle of 20~30°, slope length of 11~20m, and slope width of 6~10m. Landslide of west side is the typical landslide of Gneiss and Granite and the type of small scale which has narrow slope width.

Analysis of nano-crystals: Evaluation of heavy metal-embedded biological specimen by high voltage electron microscopy

Jeong, Hyeongseop,Yoo, Seung Jo,Won, Jonghan,Lee, Hyun-Ju,Chung, Jeong Min,Kim, Han-ul,Kim, Gwang Joong,Kim, Jin-Gyu,Jung, Hyun Suk,Hyun, Jaekyung Elsevier 2018 Ultramicroscopy Vol.194 No.-

<P><B>Abstract</B></P> <P>Heavy metal compounds are adsorbed onto biological specimen in order to enhance the contrast as well as to preserve the structural features of the specimen against electron beam-induced radiation damage. In particular, in combination with computational image processing, negative staining is widely used for structural analysis of protein complexes to moderate resolutions. Image analysis of negatively stained biological specimen is known to suffer from limited achievable resolution due to dehydration and large grain size of staining molecules although the extent of such effect remains somewhat dubious.</P> <P>Stain molecules exist as grains under electron beam. However, clear observation of the crystalline nature of the grains and their association with biological specimen has not been thoroughly demonstrated. In this study, we attempted high-resolution TEM (HRTEM) using high voltage electron microscopy and electron crystallography analysis for the detailed characterization of negatively stained biological specimen, focusing on physical state and chemical composition of the stain molecules. The electron crystallography analysis allowed for the identification of the crystal constituents of widely used stains, hence revealing the chemical nature and the morphology of the stain molecules at specimen level. This study re-evaluated generally accepted notions on negative staining, and may help correctly interpreting the structural analysis of stained biological specimen.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High voltage electron microscopy (HVEM) visualized nano-crystals surrounding of heavy metal-embedded biological specimen. </LI> <LI> Electron crystallography determined chemical composition of the stain molecules. </LI> <LI> The grain size of nano-crystals of stained molecules from uranyl acetate and uranyl formate were nearly identical, and consistent with that of uranium dioxide (UO<SUB>2</SUB>). </LI> <LI> It identified that UO<SUB>2</SUB> is the main contributor of image contrast of heavy metal-embedded biological specimen. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Exploratory Data Analysis of Electricity Market in South Korea

Jiseok Ahn,Jaekyung Yoo 한국신재생에너지학회 2022 AFORE Vol.2022 No.9

기후변화 대응을 위한 파리협정 2℃목표 : 역사적 배경 고찰 및 후속협상 결과 분석

안지석(Jiseok Ahn),유재경(Jaekyung Yoo),이유아(Youah Lee) 한국에너지기후변화학회 2021 한국에너지기후변화학회 학술대회 Vol.2021 No.5

2022 개정 영어 서책형 교과서의 개발 방향 제안

허영주(Youngju Heo),유재경(Jaekyung Yoo) 교과와 교과서학회 2022 교과와교과서연구 Vol.2 No.2

본 연구는 교육부의 ‘2022 개정 교육과정 총론 주요사항’발표와 관련하여, 새롭게 개정된 교육과정의 핵심 가치와 강조점을 반영한 2022 개정 영어 서책형 교과서의 개발 방향을 제안하는 데 목적이 있다. 이를 위해 본 연구에서는 첫째, 2022 개정 교육과정의 강조점과 교수 ‧ 학습 및 평가 개선안을 반영하여 제시해보았으며 둘째, 새로운 교육 정책과 교육 환경을 고려하여 구상해 보았다. 셋째, 학습자의 흥미를 극대화 시킬 수 있는 방법을 모색하고 교과서에 적용하여 예시와 함께 제안하였다. 본 연구는 2022 개정 서책형 교과서의 개발 방향에 집중하였지만 2022 개정 교육과정에서는 디지털 교과서의 역할도 중요하기에 2022 개정 디지털 교과서의 개발 방향에 관한 후속 연구도 필요하다. The purpose of this study is to suggest the development direction of the 2022 revised English paper textbooks in relation to the announcement of the ‘2022 Revised Curriculum General Summary’ by the Ministry of Education. This study demonstrates the sample English paper textbook that reflects the the core values of 2022 Revised Curriculum. Furthermore, the sample English paper textbook is designed in consideration of the new educational policy and educational environment-AI convergence education and BYOD. Lastly, the sample English paper textbook focuses on textbook design to maximize the interest of learners. This study mainly focuses on the development direction of 2022 revised paper textbooks. Since the role of digital textbooks is also important in the 2022 revised curriculum, however, follow-up studies on the development direction of the 2022 revised digital textbooks are needed.

The Use of LIF-based Instrument with 405 nm for Real-time Monitoring of Aerosolized Bio-particles

Sung Nyo Yoon,Jaekyung Lee,Duckho Kim,Hyun Sang Yoo,Kyung Yool Min,Min Cheol Kim 한국대기환경학회 2019 Asian Journal of Atmospheric Environment (AJAE) Vol.13 No.3

Bio-aerosols can affect public health depending on the origin of bio-particles (bacteria, virus etc.). Here, we attempted to assess the applicability of laser-induced fluorescence (LIF) instrument with 405 nm to real-time monitoring of bacteria and viruscontaining aerosols. For the purpose, the LIF-based BDS (Bio-aerosol Detection System) was used. The bio-particle monitoring of the BDS is based on fluorescence signals from two wavelength ranges [short wavelength range (SWR): 430-550 nm & long wavelength range (LWR): 500-600 nm] and the scattering signal. Firstly, auto-fluorophores (NADH, riboflavin, tyrosine, tryptophan) were tested to expect the monitoring ranges of the BDS for the auto-fluorophores. NADH and riboflavin showed fluorescence signals from two wavelength ranges, and the fluorescence efficiency of NADH was higher in the SWR than in the LWR and that of riboflavin was reversed. While tyrosine and tryptophan showed negligible fluorescence signals from two wavelength ranges as expected. Next, the lyophilized powders of Bacillus subtilis (BS), virus vaccines [ND (Newcastle Disease), IB (Infectious Bronchitis)] and the bacteriophage MS2 were tested to investigate the monitoring ranges of the BDS for the bio-particles. Individual virus and bacteriophage have been expected no fluorescence signals because of the absence of NADH and riboflavin fluorescing by 405 nm. Nonetheless, all the tested samples showed the fluorescence signals in the size range of 2 to 15 μm, generally known as bio-aerosol size. Considering that atmospheric virus particles are released through the respiratory organs of their hosts, just as virus vaccines from chicken embryo and MS2 from E. coli, it can be thought in turn that the BDS can also monitor bio-aerosols including virus as well as bacteria. Taken together, we suggests that the BDS, LIF-based instrument with 405 nm, is applicable for real-time monitoring of virus-containing aerosols as well as other bio-aerosols by counting the fluorescence particles and resolving their particle sizes.

기후변화 적응분야의 시민과학 활용 동향과 시사점

김아라(Kim, Ara),고재경(Koh, Jaekyung),유가영(Yoo, Gayoung) 한국기후변화학회 2021 한국기후변화학회지 Vol.12 No.5

강원 인제지역 토석류 사방시설의 준설 및 퇴적 특성

박병수(Byungsoo Park),전상현(Sanghyun Jun),엄재경(Jaekyung Um),조광준(Kwangjun Cho),유남재(Namjae Yoo) 한국지반환경공학회 2013 한국지반환경공학회논문집 Vol.14 No.1

강원도 인제지역의 토석류 사방시설 유형에 따른 준설 및 퇴적특성을 알아보기 위하여 불투과형 및 투과형 사방댐을 각각 5개소를 선정하고 선정된 사방댐에 대한 퇴적특성 및 지하수위 분포에 대한 현장조사와 지역 내에 분포하는 51개 사방시설에 대한 유역면적, 저장능력, 준설량 등의 자료를 분석하였다. 현장조사 결과 불투과형 사방댐은 평상 시 대규모 토석류가 발생하지 않았음에도 불구하고 퇴적물이 쌓여있어 대규모 토석류 발생 시 사방댐 저장능력이 작아질 수 있음을 나타내었다. 불투과형 사방댐의 평상 시 수위는 퇴적토의 지표에 위치하여 배수가 원활하게 이루어지지 않을 수 있으나, 투과형 사방댐 수위는 버트리스 부분 하단에 존재하여 큰 강우에서도 사방댐으로 인하여 지반 포화를 발생하지 않을 것으로 나타났다. 또한, 사방시설의 저장능력과 유역면적, 준설량의 상관성 분석결과, 사방시설의 설치에 있어 유역면적에 따른 사방시설의 규모가 잘 반영되지 않았으며 큰 사방댐 시설을 건설하였으나 실제 퇴적량은 작게 나타나 향후 효율적인 사방시설의 계획 및 시공이 이루어져야 할 것으로 나타났다. 5 each permeable and impermeable debris dams were selected to analyze the characteristics of dredging and sedimentation according to facility type in Inje, Gangwon. Field tests for the ground water table and sedimentation characteristics of the selected dams were performed. Furthermore, data of the dredging amount, storage capacity, and drainage area were analyzed for the 51 more debris control facilities. From the results of field tests, it was found that the storage capacity of impermeable debris dam could be not enough when the large debris flow is produced since sediments are accumulated even if large debris flow was not occurred. Drainage can be a problem since the ground water table of impermeable debris dam was reached to the surface of ground. However, it was found that the ground saturation should not occur at heavy rain since ground water table of permeable debris dam was located in lower part of buttress. Furthermore, from the analysis results of relation among the dredging amount, basin area, and capacity of debris control facility, it was found that size of debris control facility was not reflected by the basin area. Effective planning and construction should be accomplished for the future since the real sedimentation amount was not significant even though large debris dams were constructed.

Cytogenetic study of glioneuronal tumor with neuropil-like islands: A case report

Min, Hye Sook,Lee, Sang Hyun,Yoo, Heon,Myung, Jaekyung,Hong, Eun Kyoung,Park, Sung-Hye Blackwell Publishing Asia 2010 NEUROPATHOLOGY Vol.30 No.4

<P>Glioneuronal tumor with neuropil-like islands (GTNI) is a recently recognized glioneuronal neoplasm but it was classified as an astrocytic tumor by the World Health Organization (WHO) in 2007. We performed a cytogenetic study in a case of GTNI arising in a 55-year-old man and analyzed its genetic alteration. It presented as a heterogeneously enhancing, multi-lobulating solid mass on MRI. Histopathologically, the tumor showed the biphasic feature of the predominating micronodular neuropil-like islands and the diffusely infiltrating glial component. In addition, the prominent blood vessels with perivascular hyalinization were observed. On cytogenetic study, loss of 4q, 5q, 11p and gain of 6p, 7, 8, 11q, 12p, 15q were found. The remaining tumor after subtotal resection progressed 7 months later, despite combined chemo- and radiotherapy. From the results, it seems that GTNI does not share pathologic or genetic features with conventional astrocytoma, suggesting a unique entity with aggressive behavior.</P>