국내 귀리품종 탈부특성에 따른 품질 및 유연관계 분석

김경민,신동진,김경훈,권유리,박효진,현종내,김영진,오명규,박영훈,Kim, Kyeong-Min,Shin, Dongjin,Kim, Kyeong-Hoon,Kwon, Yu-Ri,Park, Hyo-Jin,Hyun, Jong-Nae,Kim, Young-Jin,Oh, Myung-Kyu,Park, Young-Hoon 한국식물생명공학회 2018 식물생명공학회지 Vol.45 No.4

귀리(Avena Sativa L., Oat)에서 이삭모양과 탈부특성이 다른 겉귀리와 쌀귀리를 품질특성으로 구분하고자 12 품종 귀리종실의 이화학적 특성 및 식이섬유를 분석하였고, 61개의 SSR 분자마커를 이용하여 근연관계 및 조양 판별 마커조합을 설정하였으며 결과를 요약하면 다음과 같다. 1. 공시한 12개의 귀리 품종을 생육조사 한 결과 쌀귀리는 이삭의 한 소수에서 영화수가 4~5개 생기는데 비해 겉귀리는 2~3개 생겼으며, 탈곡 후 종실의 껍질 유무 또한 쌀귀리는 없었고 겉귀리는 껍질이 남아있는 형태로 기존에 알려진 것과 같은 결과를 보였다. 2. 단백질은 쌀귀리가 13.45 ~ 16.56%, 겉귀리는 12.95 ~ 15.31%의 함량 분포를 나타내었으며, 지방은 쌀귀리가 7.26 ~ 10.34%, 겉귀리는 7.53 ~ 10.82%의 함량 분포를 나타내었으며, 베타글루칸은 쌀귀리가 4.19 ~ 5.05%, 겉귀리는 3.49 ~ 5.60%의 함량 분포를 나타내어 귀리 품종 간에는 품질특성이 차이가 나타났으나 쌀귀리와 겉귀리를 구분 할 수 있을 정도는 아니었다. 3. 지방산 조성 비율은 쌀귀리가 겉귀리에 비해 올레인산(C18:1, Oleic acid, 40.2 ~ 50.9%)과 스테아르산(C18:0, Stearic acid, 1.2 ~ 2.5%)이 높은 비율을 나타냈으며, 겉귀리는 쌀귀리에 비해 리놀레산(C18:2, Linoleic acid, 30.6 ~ 41.2%)과 리놀렌산(C18:3, Linolenic acid, 0.7 ~ 1.3%)이 더 높은 비율을 보였다. 4. 귀리의 근연관계는 계수(Coefficient) 1.22에서 그룹 하여 정리한 결과 겉귀리 6품종과 쌀귀리 1품종으로 그룹 되었고 유전적 거리(Genetic Distance)는 '동한'과 '태한'이 가장 가깝게 나타났으며 다음은 '풍한', '삼한', '옥한', '조풍', '중모2005' 순으로 나타났다. 계수(Coefficient) 1.22에서 그룹 되지 않은 귀리는 겉귀리 1품종과 쌀귀리 4품종으로 '수양', '다한', '대양', '선양', '조양' 순으로 그룹에서 먼 것으로 나타나 대체적으로 겉귀리와 쌀귀리가 서로 멀게 나타났다. 5. 12개의 귀리품종에 61개의 SSR maker를 이용하여 분석한 결과 '조양'은 AM28, 29, 32, 34, 36의 5개 SSR마커에서 다른 품종과 다른 밴드 패턴을 나타내어 품종 구분이 가능하였다. The consumption of oats (Avena sativa L.) with high nutritional utility is accelerating due to the increased consumers' demand for functional foods. In Korea, naked oats are used as food, while covered oats are used for animal feed. However, it is difficult to distinguish naked oats from covered oats when the husk is removed from the grains by a special process. The present study was carried out to investigate experimental methods that would be beneficial in the segregation of different types of oats after husk removal. Grain quality-related biochemical compounds were analyzed in a bid to differentiate the oat dehulling characteristics. In addition, 61 SSR markers were examined for genetic relationship and variety identification of oats using five naked and seven covered oat varieties. Results showed that, the contents of protein, lipid, and ${\beta}-glucan$ were not significantly different among the oat varieties and this could not be used as an index for distinguishing oats husk character. However, in the fatty acid composition ratio,, naked oats had a higher ratio of stearic acid (C18:0) and oleic acid (C18:1) than covered oats, and covered oats had a higher ratio of linoleic acid (C18:2) and linoleic acid (C18:3) than naked oats. The assessment of SSR marker genotype revealed that 33 polymorphic bands among 12 oat varieties and 1 variety could be distinguished through the combination of polymorphic markers thus indicating the usability of these markers for variety identification in oats.

후열처리에 따른 Cu-NiCrBSi 이종 레이저 클래드부의 미세조직 및 기계적 성질 변화

김경민,정예선,심아진,박원아,박창규,천은준,Kim, Kyeong-Min,Jeong, Ye-Seon,Sim, Ahjin,Park, Wonah,Park, Changkyoo,Chun, Eun-Joon 한국재료학회 2020 한국재료학회지 Vol.30 No.9

For surface hardening of a continuous casting mold component, a fundamental metallurgical investigation on dissimilar laser clads (Cu-NiCrBSi) is performed. In particular, variation behavior of microstructures and mechanical properties (hardness and wear resistance) of dissimilar clads during long-term service is clarified by performing high-temperature post-clad heat treatment (temperature range: 500 ~ 1,000 ℃ and isothermal holding time: 20 ~ 500 min). The microstructures of clad metals (as-clads) consist of fine dendrite morphologies and severe microsegregations of the alloying elements (Cr and Si); substrate material (Cu) is clearly confirmed. During the post-clad heat treatment, the microsegregations are totally homogenized, and secondary phases (Cr-based borides and carbides) precipitated during the short-term heat treatment are also almost dissolved, especially at the heat treatment conditions of 950 ℃ for 500 min. Owing to these microstructural homogenization behaviors, an opposite tendency of the surface mechanical properties can be confirmed. In other words, the wear resistance (wear rate) improves from 4.1 × 10^-2 ㎣/Nm (as-clad condition) to 1.4 × 10^-2 ㎣/Nm (heat-treated at 950 ℃ for 500 min), whereas the hardness decreases from 453 HV (as-clad condition) to 142 HV (heat-treated at 950 ℃ for 500 min).

NTC 서미스터로 응용을 위한 Ni-Mn-Co 산화물의 미세구조와 전기적 특성

김경민,이성갑,권민수,김영곤,Kim, Kyeong-Min,Lee, Sung-Gap,Kwon, Min-Su,Kim, Young-Gon 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.6

In this paper, we investigated the effect of Co content on the microstructural and electrical properties of $Ni_{0.79}Mn_{2.21-x}Co_xO_4$ (x=0 to 0.25) specimens. Solid-state reaction was used to prepare the bulk specimens. XRD (X-ray diffraction) patterns showed that all compositions had a cubic spinel phase. As a result of the microstructural properties, FE-SEM(field-emission scanning electron microscopy) analysis showed a dense structure, and the mean grain size increased from $5.24{\mu}m$ to $7.33{\mu}m$ with an increase of Co content from x=0 to 0.25. All specimens exhibited the typical NTC thermistor characteristics as the electrical resistance exponentially decreased with increasing temperature. The resistivity and the B-value of $Ni_{0.79}Mn_{1.96}Co_{0.25}O_4$ were $2959{\Omega}{\cdot}cm$ and 3719, respectively.

온도센서로의 응용을 위한 Zn-Mn-O계 세라믹의 구조적, 전기적 특성

김경민,이성갑,이동진,박미리,권민수,Kim, Kyeong-Min,Lee, Sung-Gap,Lee, Dong-Jin,Park, Mi-Ri,Kwon, Min-Soo 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.8

In this study, $Zn_xMn_{3-x}O_4$ (x=0.95~1.20) specimens were prepared by using a conventional mixed oxide method. All specimens were sintered in air at $1,200^{\circ}C$ for 12 h and cooled at a rate of $2^{\circ}C/min$ to $800^{\circ}C$, subsequently quenching to room temperature. We investigated the structural and electrical properties of $Zn_xMn_{3-x}O_4$ specimens with variation of ZnO amount for the application of NTC thermistors. As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution with tetragonal spinel phase. And, the second phase was observed by the solubility limit of Zn ions in $x{\geq}1.10$ composition. The average grain size was increased from $2.72{\mu}m$ to $4.18{\mu}m$ with increasing the compositional ratio of Zn ion from x=0.95 to 1.20, respectively. $Zn_{1.10}Mn_{1.90}O_4$ specimen showed the minimum electrical resistance of $57.5k{\Omega}$ at room temperature and activation energy of 0.392 eV.

Ni-Mn 산화물 NTC 서미스터의 미세구조와 전기적 특성에 미치는 CuO 첨가의 효과

김경민,이성갑,이동진,박미리,Kim, Kyeong-Min,Lee, Sung-Gap,Lee, Dong-Jin,Park, Mi-Ri 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.6

In this study, $ Ni_{0.79}(Mn_{2.21-x}Cu_x)O_4$ (x=0~0.25) specimens were prepared by using a conventional mixed oxide method. All specimens were sintered in air at $1,200^{\circ}C$ for 12 h and cooled at a rate of $2^{\circ}C/min$ to $800^{\circ}C$, subsequently quenching to room temperature. We investigated the structural and electrical properties of $ Ni_{0.79}(Mn_{2.21-x}Cu_x)O_4$ specimens with variation of CuO amount for the application of NTC thermistors. As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution with cubic spinel phase. The relationship between ln ${\rho}$ and the reciprocal of absolute temperature(1/T) for the NTC thermistors was shown linearity, which exhibited the typical NTC thermistor properties. With increasing the amount of CuO, resistivity at room temperature, B-value, and temperature coefficient resistance decreased.

폴리 실리콘을 이용한 금속-반도체-금속 광 검출기의 열처리에 따른 전기적 특성

김경민,김정열,이유기,최용선,이재성,이영기,Kim, Kyeong-Min,Kim, Jung-Yeul,Lee, You-Kee,Choi, Yong-Sun,Lee, Jae-Sung,Lee, Young-Ki 한국재료학회 2018 한국재료학회지 Vol.28 No.4

This study investigated the effects of the post annealing temperatures on the electrical and interfacial properties of a metal-semiconductor-metal photodetector(MSM-PD) device. The interdigitate type MSM-PD devices had the structure Al(500 nm) / Ti(200 nm) / poly-Si(500 nm). Structural analyses of the MSM-PD devices were performed by employing X-ray diffraction(XRD), scanning electron microscopy(SEM) and transmission electron microscope(TEM). Electrical characteristics of the MSM-PD were also examined using current-voltage(I-V) measurements. The optimal post annealing condition for the Schottky contact of MSM-PD devices are $350^{\circ}C$-30minutes. However, as the annealing temperature and time are increased, electrical characteristics of MSM-PD device are degraded. Especially, for the annealing conditions of $400^{\circ}C$-180minutes and $500^{\circ}C$-30minutes, the I-V measurement itself was impossible. These results are closely related to the solid phase reactions at the interface of MSM-PD device, which result in the formation of intermetallic compounds such as $Al_3Ti$ and $Ti_7Al_5Si_{12}$.

공간정보 오픈플랫폼 탑재를 위한 한옥의 BIM 기반 3차원 모델링 연구

김경민,김찬용,최연웅,조기성,Kim, Kyeong-Min,Kim, Chan-Yong,Choi, Yun-Woong,Cho, Gi-Sung 한국국토정보공사 공간정보연구원 2014 지적과 국토정보 Vol.44 No.2

본 연구에서는 비정형구조인 한옥 구조물을 LOD3 수준의 3차원 객체로 제작하여 국내 외로 대중화된 오픈플랫폼에 탑재함으로써 한옥 구조물의 3차원 모델링을 통한 3차원 지도 제작의 가능성을 확인하였다. 또한, BIM 기반을 이용한 한옥의 3차원 모델 제작을 통해 실내 공간정보에 대한 3차원 모델링을 수행함으로써 한옥 구조물의 3차원 표현기법과 상위 표현방법의 발전가능성을 확인하고자 하였다. 아울러 비정형 구조물인 한옥의 LOD4단계 수준의 공간정보 표현의 가능성을 제시하였으며 현재 국내 외에서 제공되고 있는 공간정보 오픈플랫폼의 허용 데이터 크기의 한계에 의하여 탑재는 불가능함 또한 확인하였다. This study tried to create 3D object with LOD3 level for Korean traditional house which is atypical structure, upload to spatial information open platform and confirm the possibility for creating 3D-map. And this study tried to create 3D model for Korean traditional house based on BIM, performed 3D modeling for interior spatial information of Korean traditional house and confirm the development possibility of 3D modeling and visualization method of Korean traditional house. Also this study present the possibility of LOD4 level visualization for spatial information of Korean traditional house which is atypical structure, but 3D object with LOD4 level can't be uploaded to Spatial Information Open Platform currently, cause by data volume limitation of spatial information open platform.

LED 효율 향상을 위한 Texture구조 AZO 박막의 제조와 광학적 특성분석

김경민,진은미,박춘배,Kim Kyeong-Min,Jin Eun-Mi,Park Choon-Bae 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.10

The transparent conductive oxide(TCO) has been used in necessity as front electrode for increasing efficiency of LED. In our paper, aluminium-doped zinc oxide films(AZO), which has transparent conducting were prepared with RF magnetron sputtering system on glass substrate(corning 1737) and annealed at $400^{\circ}C$ for 2 hr in vacuum ambient and $600^{\circ}C$ for 2hr with $O_2$ ambient respectively. The smooth AZO films were etched in diluted HCL(0.5 %) to examine the surface properties, which in ambient post-annealing process. We confirmed that the electric, structural and optical properties of textured AZO thin films, which implemented using the methods of XRD, FWHM, AFM and Hall measurement. The properties of textured AZO thin films especially depended on the ambient post-annealing process. We presumed that the change of transmittances as R G B LED and the ambient post-annealing process will be increasing the efficiency of LED.

수평자장 하에서 성장된 CZ 실리콘 단결정의 산소 분포 및 석출거동

김경민,최광수,이문희,Kim, Kyeong-Min,Choi, Kwang-Su,P. Smetana,T.H. Strudwick,Lee, Mun-Hui 한국재료학회 1992 한국재료학회지 Vol.2 No.2

수평자장을 건 Czochralski(HMCZ) 방법으로 자장강도(B)와 도가니 회전속도(C)가 실리콘 단결정의 산소편석에 미치는 영향에 대하여 연구하였다. B=2, 3, 4kG와 C=4-15rpm에서 <100> 방향으로 성장시킨 57mm 직경의 단결정들 내의 산소분포는 대체로 축을 따라서 불균일하였고 톱니모양을 나타내었다. 종래의 CZ 방법과 비교할 때, 이러한 산소분포의 불균일성은 위 강도의 수평자장이 결정성장계면으로의 산소전달에 불안정한 요소로 작용했음을 나타낸다고 볼 수 있다. 반면에 C의 증가는 산소분포의 불균일성의 약화와 산소농도의 전반적인 증가를 유도하였다. 이 결과를 토대로 B=2kG에서 27-36ppma인 산소분포를 가진 단결정이 프로그램된 C에 의해서 얻어졌다. 소자제조공정을 모의한 열처리 과정에서 HMCZ 실리콘의 산소석출은 종래의 CZ 실리콘의 산소석출에 비해서 상대적으로 불균일하였고, as-grown 상태에서의 고르지 못한 HMCZ 실리콘의 산소분포가 주요 원인임이 밝혀졌다. Oxygen segregation in horizontal-magnetic-field-applied Czochralski (HMCZ) silicon crystals has been studied as a function of magnetic field strength (B) and crucible rotation rate (C). Along the axis of 57mm din. <100> crystals grown under B=2, 3, 4 kG and C=4-15rpm, the oxygen distribution was usually saw-tooth shaped and fluctuated unevenly. Compared to the conventional CZ method, this result seems to indicate that the horizontal magnetic field, at levels used in the present experiment, had a destabilizing influence on oxygen transport to the growth interface. On the other hand, as C increased, the oxygen fluctuation lessened, and [0] increased overall. At B=2 kG, an oxygen profile in a level of 27-36 ppma was achieved by a programmed ramp of C. Oxygen precipitation behavior of the HMCZ silicon during a simulated device manufacturing process was compared and found to be inferior to that of typical CZ silicon. The uneven oxygen profile in the as-grown state was identified as the major source of poor precipitation uniformity in the HMCZ silicon.

지상 LiDAR를 이용한 BIM 기반 건물의 3D 공간정보 구축 연구

김경민,이길재,조기성,Kim, Kyeong-Min,Lee, Kil-Jae,Cho, Gi-Sung 한국국토정보공사 공간정보연구원 2016 지적과 국토정보 Vol.46 No.1

최근 IT기술의 발달과 함께 건설 분야와 IT기술의 융합에 맞추어 비정형화와 대형화로 인해 건물의 외형이 다양해지고 있다. 이에 건물을 기존보다 정확하게 표현하면서 시각적으로도 우수한 3차원 공간정보를 구축하기 위해 본 연구에서는 대상 건물을 지상 LiDAR를 이용해 고밀도 점군자료를 취득하였고, 이를 바탕으로 BIM(Building Information Modeling) 기반의 건물 모델을 제작하였다. 이를 각 층별 레이어로 개별 추출하여 높이에 따른 건물 외곽정보들과의 차이점을 확인하였으며, IFC 표준 포맷을 활용한 공개형 BIM을 통해 구조물의 외곽 현황 파악이 가능함을 확인하였으며, 이를 기반으로 하는 새로운 입체지적 및 공간정보 데이터 구축 방안을 제시하였다. Recently, along with the development of IT, the non-linearity and enlargement in the response to the combination of the building industry and IT have made a wide variety in outer shapes of the buildings. So buildings need a more accurate representation using visually superior three-dimensional space information. Therefore, the study models the shapes of the other buildings in accordance with the heights. Frist of all, we measured the buildings using a Terrestrial LiDAR. Second, we obtained a high-density point cloud date of the buildings. Through this data, we made the BIM model and compared the heights of each floor's outer information layers. And then identified the BIM data status using IFC standards formats. From this data, it proposes a new 3D cadastre and the alternative for the establishment of spatial information.