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신석기시대 입지 환경에 따른 따비의 제작방법 -암사동·운서동 유적 출토품을 중심으로-
김영준 ( Kim¸ Youngjun ) 단국사학회 2020 史學志 Vol.60 No.-
이 글에서는 신석기시대에 구릉지와 충적지 주거지 유적에서 출토되는 따비의 제작기술 차이를 확인하고, 이러한 차이가 왜 나타나는지 살펴보았다. 한강 본류역에는 지형상 구릉지와 충적지에 신석기시대 주거지 유적이 확인되며, 이들 유적에서는 대표적인 뗀석기로 따비가 공통적으로 출토되고 있다. 하지만 지금까지 선행연구들은 따비의 형태분류가 중심이어서 이들 유적 출토 따비를 하나의 범주로 분류하여 입지 환경에 따라 나타나는 다양한 기술적 측면을 소홀히 다루었다. 충적지를 대표하는 암사동 유적 출토 따비의 경우 돌감으로는 돌결면이 발달하지 않은 조직이 치밀한 자갈돌 각섬암과 응회암을 이용하였고, 구릉지를 대표하는 운서동 유적 출토 따비의 경우 돌결면이 매우 발달한 모난돌 편암을 이용하였다. 입지환경 별 따비의 밑감은 암사동 유적의 경우 너비격지를 운서동 유적의 경우 모난돌 조각을 이용하여 따비 제작에 사용하였다. 이러한 제작기술의 차이는 결국 입지환경에 따른 사용방법에 차이, 즉 장착 유무에서 기인하였다고 판단된다. 충적지 유적인 암사동 유적 따비는 장착없이 사용된 도구로 파악되며, 구릉지 유적인 운서동 유적 따비는 목제에 장착하기 위해 만들어진 따비임이 제작기술에서 확인된다. This article explains the technical differences of manufacturing weederplow derived from residential sites located in alluvion or hill areas, and then tries to approach the reason why these differences are made. Neolithic residential sites are confirmed, which are located in alluvion or hill areas of main river valley in Hangang river, and weederplow is one of the representative remains from the sites. However, according to the precedent studies, they did not pay attention to various technical aspects of weederplow because morphological characteristics were the main point. Amphibolite and tuff that have densed and undelveloped surface, were used to make weederplow from Amsadong, which is one of the representative remains in alluvion areas and schist that has developed surface, was used to make weederplow from Unseodong, which is one of the representative remains in hilly areas. In case of Amsadong, flake was used to make weederplow and in Unseo case, debris was used as the raw material. These technical differences could be made by method of use depending on geographical conditions, in other words, With or without mounting is the key. Amsadong weederplow from alluvion areas might be used without equipment, but Unseo weederplow might have the purposed to be equipped with wood and it could be shown in the manufacturing process.
[PC-0012] Pre-study for early detection of Fusarium fujikuroi via fluorescence imaging method
Jaeyoung Kim(Jaeyoung Kim),Younguk Kim(Younguk Kim),Hyeonso Ji(Hyeonso Ji),Songlim Kim(Songlim Kim),Hyoja Oh(Hyoja Oh),Youngjun Mo(Youngjun Mo),Kyunghwan Kim(Kyunghwan Kim),Jeongho Baek(Jeongho Baek) 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Kim, Choong-Ki,Jeong, Eun Gyo,Kim, Eungtaek,Song, Jeong-Gyu,Kim, Youngjun,Woo, Whang Je,Lee, Myung Keun,Bae, Hagyoul,Jeon, Seong-Bae,Kim, Hyungjun,Choi, Kyung Cheol,Choi, Yang-Kyu IOP 2017 Nanotechnology Vol.28 No.5
<P>Field-effect transistors (FETs) composed of 2D materials (2DMs) such as transition-metal dichalcogenide (TMD) materials show unstable electrical characteristics in ambient air due to the high sensitivity of 2DMs to water adsorbates. In this work, in order to demonstrate the long-term retention of electrical characteristics of a TMD FET, a multidyad encapsulation method was applied to a MoS<SUB>2</SUB> FET and thereby its durability was warranted for one month. It was well known that the multidyad encapsulation method was effective to mitigate high sensitivity to ambient air in light-emitting diodes (LEDs) composed of organic materials. However, there was no attempt to check the feasibility of such a multidyad encapsulation method for 2DM FETs. It is timely to investigate the water vapor transmission ratio (WVTR) required for long-term stability of 2DM FETs. The 2DM FETs were fabricated with MoS<SUB>2</SUB> flakes by both an exfoliation method, that is desirable to attain high quality film, and a chemical vapor deposition (CVD) method, that is applicable to fabrication for a large-sized substrate. In order to eliminate other unwanted variables, the MoS<SUB>2</SUB> FETs composed of exfoliated flakes were primarily investigated to assure the effectiveness of the encapsulation method. The encapsulation method uses multiple dyads comprised of a polymer layer by spin coating and an Al<SUB>2</SUB>O<SUB>3</SUB> layer deposited by atomic layer deposition (ALD). The proposed method shows wafer-scale uniformity, high transparency, and protective barrier properties against adsorbates (WVTR of 8?×?10<SUP>−6</SUP> g m<SUP>−2</SUP> day<SUP>−1</SUP>) over one month.</P>
3D virtual simulator for breast plastic surgery
Kim, Youngjun,Lee, Kunwoo,Kim, Wontae John Wiley Sons, Ltd. 2008 Computer Animation and Virtual Worlds Vol. No.
<P>We have proposed novel 3D virtual simulation software for breast plastic surgery. Our software comprises two processes: a 3D torso modeling and a virtual simulation of the surgery result. First, image-based modeling is performed in order to obtain a female subject's 3D torso data. Our image-based modeling method utilizes a template model, and this is deformed according to the patient's photographs. For the deformation, we applied procrustes analysis and radial basis functions (RBF). In order to enhance reality, the subject's photographs are mapped onto a mesh. Second, from the modeled subject data, we simulate the subject's virtual appearance after the plastic surgery by morphing the shape of the breasts. We solve the simulation problem by an example-based approach. The subject's virtual shape is obtained from the relations between the pair sets of feature points from previous patients' photographs obtained before and after the surgery. Copyright © 2008 John Wiley & Sons, Ltd.</P>
Kim, Myung Chan,Sohn, Sang Ho,Park, Duck Kyu,Jung, Sang Kooun,Kim, Eun Lyoung,Lee, Yun Su,Hur, Youngjune,Park, Lee Soon,Choi, Kyu-Han TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> In this study, we have tried the growth of indium tin oxide (ITO) thin films by using low-frequency magnetron sputtering method (LFMSM). Characteristics of ITO thin films deposited on polyethersulfone (PES) and polyetyleneterephthalate (PET) substrates are investigated. Experiments were carried out as a function of deposition time. With increasing the deposition time of the ITO thin films on PES substrate, the sheet resistance is decreased. ITO thin films on polymer substrates were amorphous structure.</P>
Kim, Youngjun,Kim, Juyun,Ko, Hyungduk,Park, Byoungnam The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.41
<P>We fabricated a functional pentacene/CH3NH3PbI3−xClx perovskite interface where optical gating and field assisted charge retention occur. Using a pentacene/perovskite field effect transistor (FET) test platform, we investigated the interfacial charge transfer associated with optical gating through threshold voltage measurements under illumination. Importantly, bistable electrical conduction in pentacene/perovskite FET devices was achieved as a result of field-induced charge retention at the interface and the origin is discussed to be associated with interfacial charging at the pentacene/perovskite interface. Interfacial contact modification associated with ion migration and other possible effects in the perovskite layer plays a crucial role in forming a functional interface involving organic semiconducting materials.</P>
Kim, Soon Hak,Hur, Youngjune,Kim, Hyun Suk,Choi, Kyu-Han,Han, Yoon Soo,Kwak, Giseop,Kwon, Younghwan,Park, Lee Soon TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.470 No.1
<P> Three-component blend system based on polyfluorene derivative (SK32®), substituted polyacetlyene (PTMSDPA) and iridium complex (red dopant) were fabricated as a single emitting layer for white OLED. The two polymers and iridium complex were well mixed to provide transparent films. Its electro-optical properties were investigated in terms of emission color, brightness, and luminescence efficiency. The optimal weight ratio for white emission was 100 (SK32®): 5 (PTMSDPA): 0.5 (red dopant). The color coordination at this ratio was (x = 0.33, y = 0.33), completely matching to white color. The luminance was 831 cd/m2 at 17 V, its current efficiency was estimated to 1.15 cd/A at 9 V and the maximum power efficiency reached 0.44 lm/W at 7 V.</P>
Kim, Youngjun,Cho, Seongeun,Kim, Hyeran,Seo, Soonjoo,Lee, Hyun Uk,Lee, Jouhahn,Ko, Hyungduk,Chang, Mincheol,Park, Byoungnam Institute of Physics Publishing Ltd. 2017 Journal of Physics. D, Applied Physics Vol.50 No.36
<P>Electric field-induced charge trapping and exciton dissociation were demonstrated at a penatcene/grapheme quantum dot (GQD) interface using a bottom contact bi-layer field effect transistor (FET) as an electrical nano-probe. Large threshold voltage shift in a pentacene/GQD FET in the dark arises from field-induced carrier trapping in the GQD layer or GQD-induced trap states at the pentacene/GQD interface. As the gate electric field increases, hysteresis characterized by the threshold voltage shift depending on the direction of the gate voltage scan becomes stronger due to carrier trapping associated with the presence of a GQD layer. Upon illumination, exciton dissociation and gate electric field-induced charge trapping simultaneously contribute to increase the threshold voltage window, which can potentially be exploited for photoelectric memory and/or photovoltaic devices through interface engineering.</P>
Method to minimize ozone effect on Cy5 fluorescent intensity in DNA microarrays
Kim, Youngjun,Seo, Hyun Hee,Jeong, Mi Seon,Lee, Ki Heon,Lee, In Ho,So, Kyeong A.,Kim, Mi Kyung,Lee, Yoo-Kyung,Kim, Seon Ah,Kim, Tae Jin Elsevier 2017 Analytical Biochemistry Vol.538 No.-
<P><B>Abstract</B></P> <P>Cyanine 5 (Cy5) is an established fluorescent dye in microarray analysis. It is degraded rapidly when exposed to atmospheric ozone during post-hybridization washes, which leads to loss of fluorescent intensity. To minimize this undesirable effect, we coated microarray slides with sodium dodecyl sulfate (SDS) solution at post-hybridization washes. The fluorescent intensities on coated slides were more stable than those on uncoated slide. We also performed the microarrays with SDS solution for a year to check the solution's effectiveness along with seasonal changes of atmospheric ozone level. Consistent results in microarray analysis were obtained using Cy5 dye under atmospheric ozone.</P>