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전단속도와 소성지수를 달리한 재생성 점성토의 응력-변형률 거동
이용희(Lee Yonghee),강권수(Kang Kwon-Soo),정상국(Jung Sang-Guk),강진태(Kang Jintae),김대현(Kim Daehyeon) 한국지반환경공학회 2011 한국지반환경공학회논문집 Vol.12 No.1
직접전단시험이나 삼축압축시험 시 하중재하속도가 증가할수록 시료의 전단강도는 증가하는 것으로 알려져 있다. 본 연구에서는 점성토 지반의 거동특성에 영향을 미치는 중요한 두 가지 요인, 즉 전단속도와 실트함유량에 따른 점성토의 응력-변형률 거동특성을 규명하기 위하여 광양지역의 재생성 점성토를 대상으로 완속재하 상태로부터 급속재하 상태까지 재현함과 동시에 실트 함유량 변화 시 그 거동 특성이 어떻게 변화되는지에 대한 연구를 수행하였다. 연구결과 동일변형률에서의 전단속도 증가에 따른 축차응력의 변화, 즉 등변형률선의 기울기는 양의 기울기를 가지며 일정변형률 이상에서는 기울기의 변화가 거의 없는 것으로 나타났다. 그리고 기울기 변화가 없는 지점의 값은 흙의 종류에 따라 달라지므로 그 흙이 가지는 고유 특성인 것으로 판단된다. In general, the shear strength of a clay specimen under the direct shear test and the triaxial compression test increases with an increase in the shear rate. This study investigates the effects of shear rate and silt content on the stress-strain behavior of remolded Gwangyang clay, by changing the shear rate and the silt content. Based on the results of the triaxial compression tests, the equi-strain line of remolded Gwangyang clay shows initially positive slope and then becomes flat at certain strain level. As the strain level where the equistrain becomes flat is different depending on the soil with different silt contents, this can be considered as the inherent property of soil.
Standard protocol conversion of digital ECG for healthcare
Yonghee Lee,Sinhyuk Kang,Kangwoo Lee 한국정보기술학회 2017 Proceedings of The International Workshop on Futur Vol.2017 No.5
In this paper, we present a method for converting the digital SCPECG used in clinical practice to the MFER standard for use in health care. Since the SCP-ECG has a complex representation format for each section, we simplify the structure by separating only the items necessary for healthcare use. We convert the structure of each section of SCP-ECG to TLV format, such as tag, length, and value. The converted result is expressed in MFER format using different tags according to the expression contents. The results show that we can simplify the structure of the SCP-ECG and translate it into other standard formats, so that it can be used in the health care field.
중앙아시아벽화 보존처리(2) : 벽화의 채색 안료 및 벽체 조성에 사용된 초재류 조사
이용희,유혜선,김수철,강형태,조연태,시게오 아오키,켄타로 오바야시 국립중앙박물관 2003 박물관보존과학 Vol.4 No.-
용산 새 박물관에 전시될 중앙아시아 벽화의 보존처리를 위해 이들 벽화의 채색안료 성분분석과 벽체에 포함된 지푸라기의 식물종 식별을 위한 조사를 실시하였다. 또한 1916년 우리 박물관에 반입되기 이전에 일본에서 시행된 보존처리 재료 및 방법을 검토하기 위하여 나무 보호틀의 목재수종 및 종이의 재질을 분석하였다. 조사결과 본4075, 4078의 검은색 안료는 carbon(C), 바탕의 흰색은 gypsum[Ca(SO₄)(H₂O)₂], 적색 계통은 lead oxide(Pb₃O₄, PbO)와 hematite(Fe₂O₃), 녹색은 Cu, As, O 화합물 등을 채색 안료로 사용하였다. 또한 벽체를 조성할 때 흙벽이 갈라지는 것을 방지하기 위해 섞어 넣은 지푸라기는 밀짚 또는 귀리짚 종류인 것으로 조사되었다. 또한 현재 벽화를 둘러싸고 있는 나무 보호틀은 버드나무속, 사시나무속, 삼나무, 그리고 소나무 중 적송류로 만들어진 것으로 밝혀졌으며 벽화(본4054, 4097)의 보호를 내부에서 발견된 종이는 뽕나무 껍질로 만든 것으로 조사되었다. For the conservation treatment of the Central Asia mural painting which is to be exhibited in the new museum in Yongsan, we analyzed the pigments used in this mural painting and examined to identify the species of the straw in the wall. We also analyzed the species of the wood of the wooden protective frame and the material of the paper in it, in order to review the material and technique of the conservation treatment performed before the mural painting had been brought to the National Museum of Korea in 1916. The results were as follows: the black pigments of Bon4075 and Bon4078 is carbon(C); the white pigment on the background is gypsum[Ca(SO₄)(H₂O)₂]; the red pigment is lead oxide(Pb₃O₄) and hematite(Fe₂O₃) etc. The straw, which had been mixed into the wall to prevent the wall from cracking, was proved to be either wheat straw or oats straw. The wooden protective frame, which protects the mural painting now, was proved to be made of Salix, Populus, Cryptomeria japonica and pine. The paper discovered in the frame was proved to be made of the bark of a mulberry.
Lee, Yonghee,Kim, Somang,Kim, Hyo Seok,Shin, Jeong Bin,Choi, Wonseok,Cho, Hyunjin,Kim, Kyungmok,Lee, Taeyang,Kim, Jinwuk,Kang, In-Byeong,Choi, Kyung Cheol,Kim, Yong-Hoon,Jeon, Duk Young The Royal Society of Chemistry 2017 Journal of materials chemistry. C, Materials for o Vol.5 No.8
<P>We demonstrate for the first time highly luminescent blue-emitting CdZnS/ZnS wurtzite core/shell nanorods (NRs) that show electric-field-induced fluorescence switching properties. Uniform CdZnS NRs were rapidly synthesized by injecting sulfur powder dissolved in 1-octadecene into a flask containing phosphonic acid ligands, and subsequently ZnS shells were coated using reagents consisting of sulfur powder, zinc sulfate heptahydrate, and oleylamine. The growth of high-quality ZnS shells resulted in a dramatically increased photoluminescence (PL) quantum yield (QY) of ∼40% with a minimal red-shift of the blue PL peak, which indicates that the combination of reagents successfully controlled a large number of defects appearing on the surface of the NR cores. By pre-annealing CdZnS cores before growing ZnS shells, we could achieve an additional increase in the maximum PL QY to 50%, decreases in both the full width at half maximum (FWHM) and the red-shift of the PL peak, and improved electric-field-induced fluorescence switching performance. Density functional theory calculations reveal that the effective relaxation of strain accumulating on the NR core during shell growth is the key to our successful synthesis of blue-emitting NRs, and that the additional improvement in performance obtained through the pre-annealing process results from the elimination of sulfur vacancies appearing at the surface of the NR core.</P>
보증기간을 지난 LPG 택시의 삼원촉매 성능저감율 비교
박용희(Yonghee Park),길지훈(Jihoon Keel),고종민(Jongmin Ko),강건우(Gunwoo Kang),권상일(Sangil Kwon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
LPG vehicles accounted for 13% of the entire vehicle registration number, and LPG Taxi is approximately 11% for full of LPG vehicles. These taxis past the warranty period to easy because taxis driving-patterns. Thus, many number of LPG taxis past of warranty period. Also Atmospheric Environment is expected to have a big impact due to the aging of the three-way catalyst. so, LPG taxis past the warranty period for the three way catalyst exhaust gas test was performed. Test was runnig on a chassis dynamometer, test mode use CVS-75 mode. Test vehicle was select on 13 car. Fix the distance average each 200000, 250000, 300000, 350000km ±10000 km. Compared there distance to stand for 200000km, THC was show to increase tendency -3%, 62%, 68%, CO was show to steady tendency -12%, 10% and 28%, NOx was show to increase tendency -15%, 32%, -14%. But this result is under of new car"s emission standard. and very small. Thus, the reason of not different each other. Only NOx Emission is over from New-car Emission standard.