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Detection of low-abundant novel transcripts in mouse hematopoietic stem cells
Kim, Hyeng-Soo,Hwang, Junmo,Kim, Young-Hun,Kim, Seonggon,Lee, Jae-Woong,Kang, Hyung-Sik,Kim, Kil Soo,Ha, Ji-Hong,Chung, Jin Woong,Chang, Kyu-Tae,Ryoo, Zae Young,Lee, Sanggyu Springer-Verlag 2009 Molecular genetics and genomics Vol.282 No.4
Transcriptome analysis of the zebrafish mind bomb mutant
Hwang, Junmo,Kim, Hyung-Soo,Seok, Ji-Woong,Kim, Jun-Dae,Koun, Soonil,Park, So-Young,Lee, Jinseok,Kim, Hyang Sook,Kim, Hyung-Seok,Kim, Kil Soo,Chang, Kyu-Tae,Ryoo, Zae Young,Wang, San Ming,Huh, Tae-Lin Springer-Verlag 2009 Molecular genetics and genomics Vol.281 No.1
Kim, Jang Ah,Kulkarni, Atul,Kang, Junmo,Amin, Rashid,Choi, Jae-Boong,Park, Sung Ha,Kim, Taesung American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>Graphene is a zero band-gap semi-metal with remarkable electromagnetic and mechanical characteristics. This study is the first ever attempt to use graphene in the surface plasmon resonance (SPR) sensor as replacement material for gold/silver. Graphene, comprised of a single atomic layer of carbon, is a purely two-dimensional material and it is an ideal candidate for use as a biosensor because of its high surface-to-volume ratio. This sensor is based on the resonance occasion of the surface plasmon wave (SPW) according to the dielectric constants of each metal film and detected material in gas or aqueous phase. Graphene in the SPR sensor is expected to enlarge the range of analyte to bio-aerosols based on the superior electromagnetic properties of graphene. In this study, a SPR-based fiber optic sensor coated with multi-layered graphene is described. The multi-layered graphene film synthesized by chemical vapor deposition (CVD) on Ni substrate was transferred on the sensing region of an optical fiber. The graphene coated SPR sensor is used to analyze the interaction between structured DNA biotin and Streptavidin is analyzed. Transmitted light after passing through the sensing region is measured by a spectrometer and multimeter. As the light source, blue light which of 450 to 460 nm in wavelength was used. We observed the SPR phenomena in the sensor and show the contrary trends between bare fiber and graphene coated fiber. The fabricated graphene based fiber optic sensor shows excellent detection sensitivity of the interaction between structured DNA and Streptavidin.</P>
유기전자소자 적용을 위한 저온 공정용 배리어 박막 연구
Junmo Kim,이동구,이원호,Myungchan An,Youngchan Jang,배형우 한국센서학회 2019 센서학회지 Vol.28 No.6
Recently, semiconducting organic materials have been spotlighted as next-generation electronic materials based on their tunable electrical and optical properties, low-cost process, and flexibility. However, typical organic semiconductor materials are vulnerable to moisture and oxygen. Therefore, an encapsulation layer is essential for application of electronic devices. In this study, SiNx thin films deposited at process temperatures below 150 °C by plasma-enhanced chemical vapor deposition (PECVD) were characterized for application as an encapsulation layer on organic devices. A single structured SiNx thin film was optimized as an organic light-emitting diode (OLED) encapsulation layer at process temperature of 80 °C. The optimized SiNx film exhibited excellent water vapor transmission rate (WVTR) of less than 5 ×10-5g/m2 ·day and transmittance of over 87.3% on the visible region with thickness of 1 µm. Application of the SiNx thin film on the top-emitting OLED showed that the PECVD process did not degrade the electrical properties of the device, and the OLED with SiNx exhibited improved operating lifetime
Flow-dependent directional growth of carbon nanotube forests by chemical vapor deposition
Kim, Hyeongkeun,Kim, Keun Soo,Kang, Junmo,Park, Young Chul,Chun, Kyoung-Yong,Boo, Jin-Hyo,Kim, Young-Jin,Hong, Byung Hee,Choi, Jae-Boong IOP Pub 2011 Nanotechnology Vol.22 No.9
<P>We demonstrated that the structural formation of vertically aligned carbon nanotube (CNT) forests is primarily affected by the geometry-related gas flow, leading to the change of growth directions during the chemical vapor deposition (CVD) process. By varying the growing time, flow rate, and direction of the carrier gas, the structures and the formation mechanisms of the vertically aligned CNT forests were carefully investigated. The growth directions of CNTs are found to be highly dependent on the nonlinear local gas flows induced by microchannels. The angle of growth significantly changes with increasing gas flows perpendicular to the microchannel, while the parallel gas flow shows almost no effect. A computational fluid dynamics (CFD) model was employed to explain the flow-dependent growth of CNT forests, revealing that the variation of the local pressure induced by microchannels is an important parameter determining the directionality of the CNT growth. We expect that the present method and analyses would provide useful information to control the micro- and macrostructures of vertically aligned CNTs for various structural/electrical applications. </P>
Synthesis of ultra-long super-aligned double-walled carbon nanotube forests.
Kim, Hyeongkeun,Kang, Junmo,Kim, Youngjin,Hong, Byung Hee,Choi, Jaeboong,Iijima, Sumio American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.1
<P>The pre-treatment (catalyst reduction with H2) time effect on the carbon nanotube (CNT) growth is reported. The total CNT height, the initial growth rate, the diameter, the number of walls, and the alignment in the CNT forests change with the catalyst reduction time. Densely packed, vertically super-aligned, double-walled CNT (DWCNT) forests with 9 mm height were synthesized in 10 hrs. We find that the density and the size of catalysts plays an important role in the alignment of the DWCNT forests, which is evidenced by atomic force microscopy (AFM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy.</P>
Economic Costs of Cancelling Nuclear Power Plants on Regional Economy
Junmo Kim(김준모),SungUk Lim(임성욱) 글로벌경영학회 2019 글로벌경영학회지 Vol.16 No.3
한국의 지역 경제는 지방자치를 시행하고 있지만 아직까지 중앙정부의 경제에 귀속되어 있다. 이에 지방정부의 경제 정책은 중앙 정부의 정책 결정에 크게 영향을 받을 수밖에 없다. 특히 지역 경제가 단일 국책 사업이나 산업군 또는 제한된 경제 분야에 크게 의존 할 때 중앙 정부의 결정은 절대적으로 영향력이 클뿐 아니라, 지역경제에 미치는 영향은 단기적으로나 장기적으로 지역경제를 손상시킬 수 있다. 이 연구는 40 년 가까이 원자력 발전의 중심지였던 경상남도의 사전계획된 원자력 발전소를 취소하겠다는 중앙 정부의 결정이 지역경제에 어떻게 영향을 미칠 것인가를 분석하였다. 본 연구의 분석방법은 발전소 건설이 아닌 기회비용과 사회 갈등 비용을 계산하여 비용을 추정하여 투자 감소가 어떠한 의미를 가지고 있는지 분석하였다. 기회비용은 원자력 발전소의 수명이 60년이기 때문에 60년 추정이 채택되고 20 년 동안 투자는 줄어들어 드는 것으로 예측하였다. 분석결과 정부 정책의 변경은 지역경제 뿐만 아니라 사회적 갈등까지 만들게 되었으 며 지역경제는 매우 큰 영향을 받게 되어 지역 경제에 매우 큰 영향을 미치는 것으로 나타났다. 따라서 향후 지역경제의 영향력을 고려할 때 중앙정부의 경제정책의 결정에 신중함이 필요하다. Regional economies can be greatly affected by the policy decision of the central government. Especially when regional and local economies depend greatly on a sole or limited number of sectors the magnitude of the impact from the central government decision will damage the economies both in the short and long term. This paper, taking this as a backdrop, analyzes the central government decision to cancel the preplanned nuclear power plants in the North Gyung Sang Province that has been the center of nuclear power generation for nearly 40 years in the country. This study utilized cost estimation by calculating opportunity costs of not building power plants and social conflict costs, which would mean reduced investments. For opportunity costs, due to the life span of 60 years of nuclear power plants, estimation of 60 years was adopted, while reduced investment was captured with a 20 year time horizon. This paper, then, concludes implications from the analysis.
A highly conducting graphene film with dual-side molecular n-doping.
Kim, Youngsoo,Park, Jaesung,Kang, Junmo,Yoo, Je Min,Choi, Kyoungjun,Kim, Eun Sun,Choi, Jae-Boong,Hwang, Chanyong,Novoselov, K S,Hong, Byung Hee RSC Pub 2014 Nanoscale Vol.6 No.16
<P>Doping is an efficient way to engineer the conductivity and the work function of graphene, which is, however, limited to wet-chemical doping or metal deposition particularly for n-doping, Here, we report a simple method of modulating the electrical conductivity of graphene by dual-side molecular n-doping with diethylenetriamine (DETA) on the top and amine-functionalized self-assembled monolayers (SAMs) at the bottom. The resulting charge carrier density of graphene is as high as -1.7 10(13) cm(-2), and the sheet resistance is as low as 86 39 ω sq(-1), which is believed to be the lowest sheet resistance of monolayer graphene reported so far. This facile dual-side n-doping strategy would be very useful to optimize the performance of various graphene-based electronic devices.</P>
Kim, Hyehyun,Oh, Minhak,Kim, Dongwook,Park, Jeongin,Seong, Junmo,Kwak, Sang Kyu,Lah, Myoung Soo The Royal Society of Chemistry 2015 Chemical communications Vol.51 No.17
<P>Single crystalline hollow metal–organic frameworks (MOFs) with cavity dimensions on the order of several micrometers and hundreds of micrometers were prepared using a metal–organic polyhedron single crystal as a sacrificial hard template. The hollow nature of the MOF crystal was confirmed by scanning electron microscopy of the crystal sliced using a focused ion beam.</P> <P>Graphic Abstract</P><P>Single crystalline hollow MOFs with cavity dimensions on the order of several micrometers and hundreds of micrometers were prepared using a metal–organic polyhedron single crystal as a sacrificial hard template. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc10051d'> </P>