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Calcium and Calmodulin-Mediated Regulation of Gene Expression in Plants

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Molecular Plant 2009年第1期2卷 13-21页

作者： Min Chul Kim Woo sik Chung Dae-Jin Yun Moo Je Cho Division of Applied Life Science (BK21 Program) Plant Molecular Biology and Biotechnology Research Center and Environmental Biotechnology National Core Research Center Gyeongsang National University Jinju 660-701 Korea

Sessile plants have developed a very delicate system to sense diverse kinds of endogenous developmental cues and exogenous environmental stimuli by using a simple Ca^2＋ ion. Calmodulin （CAM） is the predominant Ca^2＋ sensor and plays a crucial role in decoding the Ca^2＋ signatures into proper cellular responses in various cellular compartments in eukaryotes. A growing body of evidence points to the importance of Ca^2＋ and CaM in the regulation of the transcriptional process during plant responses to endogenous and exogenous stimuli. Here, we review recent progress in the identification of transcriptional regulators modulated by Ca^2＋ and CaM and in the assessment of their functional significance during plant signal transduction in response to biotic and abiotic stresses and developmental cues.

关键词： Abiotic/environmental stress calcium signaling/transport gene expression.

2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

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Journal of Materials Science & Technology 2021年第7期66卷 36-45页

作者： Young-Kyun Kim Kyu-sik Kim Young-Beum Song Jung Hyo Park Kee-Ahn Lee Department of Materials Science and Engineering Inha UniversityIncheon22212Republic of Korea Agency for Defense Development(ADD) Yuseong-guDaegeon34186Republic of Korea

This study investigated the effect of multi-step heat treatment on the microstructure, mechanical properties and fracture behavior of thick 15 Co-12 Ni secondary hardening steel. As-quenched sample was found to have elongated prior austenite grain(PAG) and coarse lenticular martensitic structure. On the other hand, heat-treated sample was observed to have fine lenticular martensitic structure due to fine PAG size and a lot of nano-sized carbides. Also, after heat treatment, nano-scale reverted austenite film was formed at the martensite interfaces. The heat-treated sample showed 2.47 GPa superior tensile strength and superior elongation of about 12 %. The high strength was mainly due to fine block size and high number density of nano-sized carbides. The average value of plane strain fracture toughness(KIC) was 29.3 MPa m1/2, which indicated a good fracture toughness even with the high tensile strength. The tensile fracture surface was observed to have ductile fracture mode(cup-and-cone) and the formation of about ~1 μm ultra-fine dimples. In addition to this, nano-sized carbides were observed within the *** findings suggested that the nano-sized carbide had a positive effect not only on the strength but also on the ductility of the alloy. The fractured surface after toughness test, also showed ductile fracture mode with a lot of dimples. Based on the above results, correlation among microstructural evolution,deformation and fracture mechanisms along the heat-treatment was also discussed.

关键词： Ultra-high strength High Co-Ni secondary hardening steel Microstructure Tensile properties Fracture toughness Reverted austenite

Development of fault section identification technique for low voltage DC distribution systems by using capacitive discharge current

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Journal of Modern Power Systems and Clean Energy 2018年第3期6卷 509-520页

作者： Chul-Ho NOH Chul-Hwan KIM Gi-Hyeon GWON Yun-sik OH College of Information and Communication Engineering Sungkyunkwan University

The increasing importance of energy efficiency has led to several studies related to the construction of a reliable low voltage DC(LVDC) distribution ***, studies on a protection scheme that considers the fault characteristics of an LVDC distribution system are essential to improve system reliability. When compared to a conventional distribution system, the most distinct feature of an LVDC distribution system is the existence of a capacitive discharge current from converters under a fault condition that results in the prompt operation of protection devices. Therefore, this study involves proposing a precise and rapid technique to identify the fault section in an LVDC distribution system. The technique involves two stages, namely: an analysis stage to analyze the capacitive discharge current and a decision stage to identify the fault section based on the fault type. A detailed discussion of each step is presented and its feasibility is verified based on the results of simulations with an ElectroMagnetic Transients Program and MATLAB~?.

关键词： Capacitive discharge current Fault section identification Fault type identification Low voltage DC distribution system

Enhanced thermoelectric properties of NbCoSn half-Heuslers through in-situ nanocrystallization of amorphous precursors during the consolidation process

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Journal of Materials Science & Technology 2023年第34期165卷 39-48页

作者： Chanwon Jung Kyuseon Jang Hail Park Jeongin Jang Hanhwi Jang Byungchul Kang Kitae Park Siyuan Zhang Ruben Bueno Villoro SuDong Park Ho Jin Ryu Yeon sik Jung Min-Wook Oh Christina Scheu Seong-Hoon Yi Pyuck-Pa Choi Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Max-Planck-Institut für Eisenforschung GmbH Düsseldorf 40237Germany Electrical Materials Research Division Energy Conversion Research CenterKorea Electrotechnology Research Institute(KERI)Changwon 51543Republic of Korea Department of Materials Science and Metallurgical Engineering Kyungpook National University80 DaehakroDaegu 41566Republic of Korea Department of Nuclear and Quantum Engineering Korea Advanced Institute of Science and Technology(KAIST)291 Daehak-roYuseong-guDaejeon 34141Republic of Korea Department of Materials Science and Engineering Hanbat National University125 Dongseodae-roYuseong-guDaejeon 34158Republic of Korea

Tailoring nanostructures is a general approach used to obtain enhanced thermoelectric properties for halfHeusler compounds because the wide areas of grain and phase boundaries could be scattering centers that lower lattice thermal ***,a common fabrication method based on the sintering of crystalline precursors crushed from as-cast alloy ingots has limitations in obtaining a homogeneous microstructure without microsized impurity phases,owing to residual elemental segregation from *** this study,we used amorphous NbCoSn alloys as a precursor for the sintered specimen to obtain a homogeneous NbCoSn bulk specimen without microsized impurity phases and segregation,which led to the enhanced Seebeck coefficient due to the high purity of the half-Heusler phase after ***,superplasticity originating from amorphous features enabled the powders to be largely deformed during the sintering process,even at a low sintering temperature(953 K).This resulted in less oxidation at both,the grain boundary and the interior,as the O diffusion pathway was blocked during the sintering *** a result,the NbCoSn0.95Sb0.05 specimen using an amorphous precursor exhibited an enhanced zT of 0.7,due to the increase in the power factor and a decrease in lattice thermal conductivity compared to the specimen using a crystalline precursor.

关键词： Half-Heusler compounds Amorphous Superplasticity Segregation Atom probe tomography

Reliability of flip-chip bonded RFID die using anisotropic conductive paste hybrid material

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 175-181页

作者： Jun-sik LEE Jun-Ki KIM Mok-Soon KIM Namhyun KANG Jong-Hyun LEE Advanced Joining Technology Team/Microjoining Center Korea Institute of Industrial Technology(KITECH) Yeonsu-gu Incheon 406-840 Korea School of Materials Science & Engineering Inha University Department of Materials Science & Engineering Pusan National University Department of Materials Science & Engineering Seoul National University of Technology

A reliability of flip-chip bonded die as a function of anisotropic conductive paste (ACP) hybrid materials, bonding conditions, and antenna pattern materials was investigated during the assembly of radio frequency identification(RFID) inlay. The optimization condition for flip-chip bonding was determined from the behavior of bonding strength. Under the optimized condition, the shear strength for the antenna printed with paste-type Ag ink was larger than that for Cu antenna. Furthermore, an identification distance was varied from the antenna materials. Comparing with the Ag antenna pattern, the as-bonded die on Cu antenna showed a larger distance of identification. However, the long-term reliability of inlay using the Cu antenna was decreased significantly as a function of aging time at room temperature because of the bended shape of Cu antenna formed during the flip-chip bonding process.

关键词：可靠性调查混合材料倒装芯片各向异性 RFID 导电膏无线电频率识别天线方向图

Trap and 1/f-noise effects at the surface and core of GaN nanowire gateall-around FET structure

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Nano Research 2019年第4期12卷 809-814页

作者： Mallem Siva Pratap Reddy Ki-sik Im Jung-Hee Lee Raphael Caulmione Sorin Cristoloveanu School of Electronics Engineering Kyungpook National University Daegu 41566 Republic of Korea Advanced Material Research Center Kumoh National Institute of Technology Gumi 39177 Republic of Korea SOITEC Bernin 38190 France Institute of Microelectronics Electromagnetism and Photonics Grenoble Polytechnic Institute Minatec Grenoble 38016 France

Using capacitance,conductance and noise measurements,we investigate the trapping behavior at the surface and in the core of triangular-shaped one-dimensional (1 D) array of GaN nanowire gate-all-around field effect transistor (GAA FET),fabricated via a top-down *** surface traps in such a low dimensional device play a crucial role in determining the device *** estimated surface trap density rapidly decreases with increasing frequency,ranging from 6.07 × 1012 cm-2·eV-1 at 1 kHz to 1.90 × 1011 cm-2·eV-1 at 1 MHz,*** noise results reveal that the power spectral density increases with gate voltage and clearly exhibits 1/f-noise signature in the accumulation region (Vgs > Vth =3.4 V) for all *** the surface depletion region (1.5 V < Vgs < Vth),the device is governed by 1/fat lower frequencies and 1/f2 noise at frequencies higher than ~ 5 *** 1/f2 noise characteristics is attributed to additional generation-recombination (G-R),mostly caused by the electron trapping/detrapping process through deep traps located in the surface depletion region of the *** cutoff frequency for the 1/f2 noise characteristics further shifts to lower frequency of 102-103 Hz when the device operates in deep-subthreshold region (Vgs < 1.5 V).In this regime,the electron trapping/detrapping process through deep traps expands into the totally depleted nanowire core and the G-R noise prevails in the entire nanowire channel.

关键词： gate-all-around field effect transistor (FET) nanowire GaN trap 1/f-noise

Autopilot Control Synthesis for Path Tracking Maneuvers of Underwater Vehicles

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China Ocean Engineering 2011年第2期25卷 237-249页

作者： Sam-Sang YOU Hyeung-sik CHOI Hwan-Seong KIM Han-Il PARK School of Mechanical and Energy Systems Engineering Korea Maritime University Department of Logistics System Engineering Korea Maritime University Department of Ocean Engineering Korea Maritime University

This paper is concerned with the robust control synthesis of autonomous underwater vehicle （AUV） for general path following maneuvers. First, we present maneuvering kinematics and vehicle dynamics in a unified framework. Based on H∞ loop-shaping procedure, the 2-DOF autopilot controller has been presented to enhance stability and path tracking. By use of model reduction, the high-order control system is reduced to one with reasonable order, and further the scaled low-order controller has been analyzed in both the frequency and the time domains. Finally, it is shown that the autopilot control system provides robust performance and stability against prescribed levels of uncertainty.

关键词： underwater vehicle path following 2-DOF control synthesis H∞ loop-shaping plant uncertainty model reduction

Relief of YAP-mediated inhibition by IKKε promotes innate antiviral immunity

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Cellular & Molecular Immunology 2018年第6期15卷 642-644页

作者： Nayoung Kim Yun-Yong Park Chul Hyun Joo Hun sik Kim Department of Convergence Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Asan Institute for Life Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Microbiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Biomedical Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea

The innate immune response to invading viruses is critical for the mounting of protective immunity,in which type I interferons(IFN),for example,IFN-αandβ,are potent effector molecules.1 Most cell types,particularly fibroblasts and epithelial cells,produce IFN-β,whereas hematopoietic cells,notably plasmacytoid dendritic cells,are the predominant sources of IFN-α.IFNs potently stimulate a variety of innate and adaptive immune cells,including macrophages,NK cells and T *** binding of type I IFN to its cognate receptor triggers the activation of the Janus kinase signal transducer and activator of transcription pathway,which results in the transcription of IFNstimulated genes that play key roles in host resistance to viral infections.

关键词： immunity protective mount

Effect of barley straw biochar application on greenhouse gas emissions from upland soil for Chinese cabbage cultivation in short-term laboratory experiments

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Journal of Mountain Science 2016年第4期13卷 693-702页

作者： Se-Won KANG Dong-Cheol SEO Yong-Hwa CHEONG Ju-Wang PARK Jong-Hwan PARK Hang-Won KANG Ki-Do PARK Yong sik OK Ju-sik CHO Department of Medicinal & Industrial Crops Korea National College of Agriculture and Fisheries Division of Applied Life Science (BK21 Program) & Institute of Agriculture and Life Sciences Gyeongsang National University Department of Bio-environmental Sciences Sunchon National University National Institute of Crop Science Rural Development Association Korea Biochar Research Center & Department of Biological Environment Kangwon National University

Chinese cabbage was cultivated in upland soil with the addition of biochar in order to investigate the potential for reduction of greenhouse gas emissions. Barley straw biochar(BSB) was introduced in a Wagner pot(1/5000a) in amounts of 0(BSB0, control), 100(BSB100), 300(BSB300), and 500(BSB500) kg 10a^(-1). After the addition of BSB into the upland soil, carbon dioxide(CO_2) emission increased while methane(CH_4) and nitrous oxide(N_2O) emissions decreased. The highest CO2 flux was measured for the BSB500 sample,(84.6 g m^(-2)) followed by BSB300, BSB100, and BSB0 in decreasing order. Relative to those of control, the total CH_4 flux and N_2O flux for the BSB500 treatment were lower by 31.6% and 26.1%, respectively. The global warming potential(GWP) of the treatment without biochar was 281.4 g CO_2 m-2 and those for treatments with biochar were in the range from 194.1 to 224.9 g CO_2 m^(-2). Therefore, introducing BSB into upland soil to cultivate Chinese cabbages can reduce the global warming potential.

关键词：温室气体排放旱地土壤土壤栽培生物炭大白菜麦秸秆实验室实验 CO2通量