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Lee, Inhye,Kim, Kuglae,Lee, Sumin,Lee, Seungjun,Hwang, Eunjin,Shin, Kihye,Kim, Dayoung,Choi, Jungki,Choi, Hyunmo,Cha, Jeong Seok,Kim, Hoyoung,Lee, Rin-A,Jeong, Suyeong,Kim, Jeongsik,Kim, Yumi,Nam, Hon Oxford University Press 2018 Journal of experimental botany Vol.69 No.15
<▼1><P>A missense mutation of <I>KARRIKIN-INSENSITIVE2</I>, <I>KAI2</I><SUP><I>ply2</I></SUP>, compromises its ligand-binding activity, which subsequently impairs KAI2-signaling and multiple aspects of light-dependent responses.</P></▼1><▼2><P><B>Abstract</B></P><P>A smoke-derived compound, karrikin (KAR), and an endogenous but as yet unidentified KARRIKIN INSENSITIVE2 (KAI2) ligand (KL) have been identified as chemical cues in higher plants that impact on multiple aspects of growth and development. Genetic screening of light-signaling mutants in <I>Arabidopsis thaliana</I> has identified a mutant designated as <I>ply2</I> (<I>pleiotropic long hypocotyl2</I>) that has pleiotropic light-response defects. In this study, we used positional cloning to identify the molecular lesion of <I>ply2</I> as a missense mutation of <I>KAI2</I>/<I>HYPOSENSITIVE TO LIGHT</I>, which causes a single amino acid substitution, Ala219Val. Physiological analysis and genetic epistasis analysis with the KL-signaling components <I>MORE AXILLARY GROWTH2</I> (<I>MAX2</I>) and <I>SUPPRESSOR OF MAX2 1</I> suggested that the pleiotropic phenotypes of the <I>ply2</I> mutant can be ascribed to a defect in KL-signaling. Molecular and biochemical analyses revealed that the mutant KAI2<SUP>ply2</SUP> protein is impaired in its ligand-binding activity. In support of this conclusion, X-ray crystallography studies suggested that the <I>KAI2</I><SUP><I>ply2</I></SUP> mutation not only results in a narrowed entrance gate for the ligand but also alters the structural flexibility of the helical lid domains. We discuss the structural implications of the Ala219 residue with regard to ligand-specific binding and signaling of KAI2, together with potential functions of KL-signaling in the context of the light-regulatory network in <I>Arabidopsis thaliana</I>.</P></▼2>
김하양(Hayang Kim),김민정(Minjung Kim),김경애(Kyungae Kim),김진태(Jintae Kim),이승준(Seungjun Lee) 한국방송·미디어공학회 2004 한국방송공학회 학술발표대회 논문집 Vol.2004 No.-
Wireless sensor network을 위한 MAC(Medium Access Control) layer를 low-rate WPAN을 목적으로 한 IEEE 802.15.4 사양에 따라 구현하고 검증하였다. 센서 네트워크의 노드는 배터리로 동작하므로 에너지 소모가 가장 큰 걸림돌이 된다. power saving을 위한 몇 가지 방법을 포함한 IEEE 802.15.4 MAC protocol을 구현함으로써 wireless sensor network에 적용 가능함을 보였다.
Kim, Tae-Young,Ha, Jewook,Cho, Kyungjune,Pak, Jinsu,Seo, Jiseok,Park, Jongjang,Kim, Jae-Keun,Chung, Seungjun,Hong, Yongtaek,Lee, Takhee American Chemical Society 2017 ACS NANO Vol.11 No.10
<P>Two-dimensional (2D) transition-metaI dichalcogenides (TMDCs) have gained considerable attention as an emerging semiconductor due to their promising atomically thin film characteristics with good field-effect mobility and a tunable band gap energy. However, their electronic applications have been generally realized with conventional inorganic electrodes and dielectrics implemented using conventional photolithography or transferring processes that are not compatible with large-area and flexible device applications. To facilitate the advantages of 2D TMDCs in practical applications, strategies for realizing flexible and transparent 2D electronics using low-temperature, large-area, and low-cost processes should be developed. Motivated by this challenge, we report fully printed transparent chemical vapor deposition (CVD)-synthesized mono layer molybdenum disulfide (MoS2) phototransistor arrays on flexible polymer substrates. All the electronic components, including dielectric and electrodes, were directly deposited with mechanically tolerable organic materials by inkjet-printing technology onto transferred monolayer MoS2, and their annealing temperature of <180 degrees C allows the direct fabrication on commercial flexible substrates without additional assisted-structures. By integrating the soft organic components with ultrathin MoS2, the fully printed MoS2 phototransistors exhibit excellent transparency and mechanically stable operation.</P>
Kim, So-Yoen,Kim, Jin-Hyoung,Son, Mi Rang,Yi, Seungjun,Kim, Chul Hoon,Son, Ho-Jin,Kang, Sang Ook American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.31
<P>In this study, we prepared phenylimidazole-based C^N-cyclometalated Ir(III) complexes (<B>DMP</B>, <B>TPF2</B>) and a C^C-cyclometalated Ir(III) complex (<B>PMP</B>), and investigated the energy transfer process by examining the intermolecular interactions between the two cyclometalated Ir(III) complexes. In films doped with 3% Ir(C^C)<SUB>3</SUB> complex (<B>PMP</B>) and 15% Ir(C^N)<SUB>3</SUB> complex (<B>DMP</B> or <B>TPF2</B>), the <B>PMP</B> effectively induced energy transfer to the <B>DMP</B> or <B>TPF2</B>. This intermolecular energy transfer process was investigated using a picosecond time-resolved emission spectroscopic method. In the case of mixing <B>PMP</B> with <B>DMP</B>, where two types of luminescence were observed at 470 and 580 nm, the emission at 470 nm was due to <B>DMP</B>, while the emission at 580 nm can be assigned as the intermolecular exciplex emission. By contrast, in the case of mixing <B>PMP</B> with <B>TPF2</B>, the emission at 465 nm corresponding to the <B>PMP</B> emission region decreased for 18.5 ns, while the emission at 530 nm corresponding to <B>TPF2</B> increased. This emission can be attributed to the energy transfer from <B>PMP</B> to <B>TPF2</B>. In addition, no change was observed in the longer wavelength region than the <B>TPF2</B> emission region for 10 μs. We analyzed the energy transfer process when <B>PMP</B> was added to the dopant (<B>DMP</B> and <B>TPF2</B>) and found that <B>TPF2</B> was more efficient than <B>DMP</B> in the device without <B>PMP</B> doping, but it showed performance deterioration in high current density (>1 mA/cm<SUP>2</SUP>) owing to activation of fluorinated ligands. Finally, it was confirmed that the operation lifetime and efficiency of the device were improved by doping 3% of <B>PMP</B> in emissive layer (EML).</P> [FIG OMISSION]</BR>
Effects of hinge design of horizontal-swing fast tool servo (HFTS) for micro-patterning on a roll
Kim, Miru,Lee, Deug Woo,Lee, Seungjun,Kim, Yongwoo,Jung, Yoongho Springer-Verlag 2018 INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TE Vol.95 No.1
<P>The fast tool servo (FTS) system is widely used for micro-structure manufacturing by diamond turning. Conventional FTS had been generally researched regarding the front/back-axial swing direction. However, development of more complex machining technology is demanded for the FTS. In this paper, we developed a right/left-horizontal swing FTS (HFTS) and analyzed its characteristics with various hinge structures. Flexure hinge structures were designed four types, considering the influence of mass and the number of hinges. Also, to compare the difference in machining performance with hinge structure, we compared the results of a machined microwave pattern on a Ni-coated steel roll mold. Comparing the machining results, the influence of mass was minor; however, machining performance varied with the number of fixed hinges. Having two fixed hinges was not suitable for precision machining due to strong over-constraint conditions. Thus, a single-hinge HFTS provides the appropriate hinge structure for precision machining of a roll mold.</P>