Arabidopsis Raf-Like Kinase Raf10 Is a Regulatory Component of Core ABA Signaling

Quy Thi Cam Nguyen,이선지,최서화,나연주,송미란,Quyen Thi Ngoc Hoang,심서영,김민식,김정일,서문수,김수영 한국분자세포생물학회 2019 Molecules and cells Vol.42 No.9

Abscisic acid (ABA) is a phytohormone essential for seed development and seedling growth under unfavorable environmental conditions. The signaling pathway leading to ABA response has been established, but relatively little is known about the functional regulation of the constituent signaling components. Here, we present several lines of evidence that Arabidopsis Raf-like kinase Raf10 modulates the core ABA signaling downstream of signal perception step. In particular, Raf10 phosphorylates subclass III SnRK2s (SnRK2.2, SnRK2.3, and SnRK2.6), which are key positive regulators, and our study focused on SnRK2.3 indicates that Raf10 enhances its kinase activity and may facilitate its release from negative regulators. Raf10 also phosphorylates transcription factors (ABI5, ABF2, and ABI3) critical for ABA-regulted gene expression. Furthermore, Raf10 was found to be essential for the in vivo functions of SnRK2s and ABI5. Collectively, our data demonstrate that Raf10 is a novel regulatory component of core ABA signaling.

Combination of an inverse solution and an ANN for damage identification on high-rise buildings

Quy T. Nguyen,Ramazan Livaoğlu 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.3

Structural health monitoring (SHM) is currently applied to control regularly the health of high-rise buildings which have deteriorated after being subjected to a sudden loading. Damage detection at element levels of a structure consisting of an enormous number of elements becomes the main objective. In this study, the complicated problem is simplified by a two-step solution. Damaged storeys are preliminarily detected before a full damage scenario at an element level is achieved. In Step 1, to overcome the issues related to the huge number of degrees of freedom (DOFs), the full building is simplified to a beam-like system using the Guyan condensation technique. As the natural characteristics of the two lowest modes at the intact and a damaged stage are obtained, the eigenvalue problem based inverse solution is applied to approximately detect damaged storeys. Furthermore, an updating procedure that is proposed in this study effectively enhances the first prediction. In Step 2, an artificial neural network (ANN) model is designed to indicate damaged members on detected storeys using only the first three modal modes. Compared to other approaches applied to detect damages on high-rise buildings, the robustness of the proposed method is that the required number of lowest modal modes is two and three in Step 1 and Step 2 respectively. Furthermore, regardless of the extension of the building in the horizontal direction, only one lateral displacement of each storey is measured to detect damaged storeys in Step 1 and generally detect damaged elements in Step 2. For light and asymmetrical damage scenarios, two more vertical displacements should be considered to obtain accurate element-level detection. However, for all cases, the required number of DOFs is significantly lower than the full system.

Enhancing adsorption efficiencies of organic molecules through covalently bonded structures of magnetic carbon nanoparticles

Quy Son Luu,Uyen Thi Do,Dokyung Kim,Jiwon Kim,Donghyeok Jo,Quynh Thi Nguyen,Youngbok Lee 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

This study introduces a facile method for synthesizing covalently bonded magnetic carbon nanoparticles(MCNs) in which carboxylic acid-functionalized activated carbon nanospheres (ACN-COOH) are connectedwith amine-terminated iron oxide nanoparticles (NPs) (Fe3O4-NH2) via a carbodiimide crosslinkingreaction. The adsorption characteristics of the developed magnetic nanoparticles (ACN-Fe3O4) wereinvestigated using a standard cationic dye (methylene blue, MB). Two additional MCNs (multi-coreand core@shell structures) were also prepared, and their adsorption performances were extensively compared. The developed ACN-Fe3O4 material thoroughly utilizes the strengths of activated carbon and Fe3O4themselves, exhibiting large specific surface areas (708.4 m2/g) and strong magnetic properties(40.3 emu/g), resulting in high adsorption capacity (349.5 mg/g) and recycling efficiency (76 % of adsorptionperformance after four cycles). In addition, a study of the mechanism reveals that pore-filling processesare dominant with minor contributions from electrostatic interactions, p–p interactions, and n–p interactions. The developed covalently bonded magnetic carbon nanoparticles (ACN-Fe3O4) can thusbe considered as competent adsorbents with the potential to compensate for the drawbacks of contemporaryMCNs, such as, low adsorption capacity, and weak magnetic properties.

Improved electrocatalytic activity of electrodeposited Ni₃S₄ counter electrodes for dye- and quantum dot-sensitized solar cells

Quy, Vu Hong Vinh,Park, Jeong-Hyun,Kang, Soon-Hyung,Kim, Hyunsoo,Ahn, Kwang-Soon Elsevier 2019 Journal of industrial and engineering chemistry Vol.70 No.-

<P><B>Abstract</B></P> <P>Nickel sulfide (Ni<SUB>3</SUB>S<SUB>4</SUB>) films are deposited onto F-doped SnO<SUB>2</SUB> (FTO) substrates using a facile one-step potentiodynamic electrodeposition without any extra treatment. The potential sweep is between −0.9V and 0.7V (vs. Ag/AgCl) for 4–10 cycles. The series resistance is gradually reduced with increased Ni<SUB>3</SUB>S<SUB>4</SUB> film thickness, indicating the metallic conduction of the Ni<SUB>3</SUB>S<SUB>4</SUB> phase. The Ni<SUB>3</SUB>S<SUB>4</SUB> deposited for 8 cycles (denoted FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8) exhibits full coverage on the FTO substrate, with 110nm thickness and a distinctive structure of porous and nanoscale interconnecting nanoparticular networks, which provide numerous electrochemical active sites to contact with electrolyte. The film not only exhibits prominent electrocatalytic activities but also shows excellent electrochemical stability in both polysulfide and iodide-based electrolytes compared to FTO/Pt. On the contrary, the FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-10 shows merged clusters, leading to more compact and less porous morphology, which reduced electrocatalytic activity. The quantum dot-sensitized solar cell (QD-SSC) fabricated using the FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8 counter electrode (CE) exhibits power conversion efficiency (PCE) of 4.57%, short-circuit current (J<SUB>sc</SUB>) of 15.92mAcm<SUP>−2</SUP>, open-circuit voltage (V<SUB>oc</SUB>) of 0.545V, and fill factor (FF) of 52.63%. In addition, the dye-sensitized solar cell (D-SSC) using FTO/Ni<SUB>3</SUB>S<SUB>4</SUB>-8 CE achieves a PCE of 8.17%, J<SUB>sc</SUB> of 16.28mAcm<SUP>−2</SUP>,V<SUB>oc</SUB> of 0.735V, and FF of 68.34%. On the other hand, the PCEs of 2.56% and 7.58% are obtained for QD-SSC and D-SSC with Pt CE, respectively. We suggest that the electrodeposited Ni<SUB>3</SUB>S<SUB>4</SUB> should be promising electrocatalytic electrodes for various applications such as QD-SSCs, D-SSCs, supercapacitors, photoelectrochemical water-splitting cells, and batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ni<SUB>3</SUB>S<SUB>4</SUB> films were electrochemically synthesized on F-doped SnO<SUB>2</SUB> substrates. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> exhibited porous and nanoscale interconnecting nanoparticular networks. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> provided excellent electrocatalytic activity and numerous active sites. </LI> <LI> It led to significantly enhanced charge transfer and mass transport kinetics. </LI> <LI> FTO/Ni<SUB>3</SUB>S<SUB>4</SUB> CE showed better performance than Pt CE for both of QD-SSC and D-SSC. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Recursive Coarse-to-Fine Localization for Fast Object Detection

Quy Nguyen Trung,Dung Phan,Soo Hyung Kim,In Seop Na,Hyung Jeong Yang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.1

Potentiodynamic Electrodeposition of CoSe₂ Films and Their Excellent Electrocatalytic Activity as Counter Electrodes for Dye-Sensitized Solar Cells

Quy, Vu Hong Vinh,Park, Jeong-Hyun,Kang, Soon-Hyung,Kim, Hyunsoo,Ahn, Kwang-Soon Electrochemical Society 2019 Journal of the Electrochemical Society Vol.166 No.10

<P>Cobalt selenide (CoSe<SUB>2</SUB>) thin films are successfully formed on F-doped SnO<SUB>2</SUB> (FTO) via a single step potentiodynamic electrodeposition process without any post treatment, and are utilized as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The electrochemical behavior of the electrodeposited FTO/CoSe<SUB>2</SUB> films is examined through Tafel polarization, cyclic voltammetry, and electrochemical impedance spectroscopy measurements. The results indicate that the FTO/CoSe<SUB>2</SUB> films exhibit outstanding electrocatalytic ability and electrochemical stability toward the I<SUP>−</SUP>/I<SUP>−</SUP><SUB>3</SUB> redox couple. The optimized FTO/CoSe<SUB>2</SUB> film fully covers the FTO substrate and features a nanoporous structure of interconnecting nanocrystalline networks, which is beneficial for the diffusion of ions and provides numerous electrochemical active sites. The optimized DSSC using FTO/CoSe<SUB>2</SUB> as CE exhibits a significantly improved cell efficiency of 7.95% compared to that of the DSSC using FTO/Pt as CE (7.48%).</P>

Autonomous Stair Climbing Algorithm for a Small Four-Tracked Robot

Quy-Hung Vu,Byeong-Sang Kim,Jae-Bok Song 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

In outdoor environments, mobility, adaptability and reliability of a robot are more important than its speed and precise trajectory. From a practical point of view, tracked robots have an advantage over wheeled robots in outdoor applications. The tracked robot is frequently operated by using the remote controller, but the remote operation is not effective for all cases. To overcome some complex obstacles such as rocks or stairs, the information related to the robot posture is required. However, the sensor information is not intuitive to the user to control the robot. In this research, a multi-active crawler robot (MACbot) was developed and the autonomous stair climbing algorithm was implemented to deal with those problems. Various experiments show that the MACbot can climb the stair autonomously.

Biometric-based key management for satisfying patient’s control over health information in the HIPAA regulations

( Quy-anh Bui ),( Wei-bin Lee ),( Jung-san Lee ),( Hsiao-ling Wu ),( Jo-yun Liu ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

According to the privacy regulations of the health insurance portability and accountability act (HIPAA), patients’ control over electronic health data is one of the major concern issues. Currently, remote access authorization is considered as the best solution to guarantee the patients’ control over their health data. In this paper, a new biometric-based key management scheme is proposed to facilitate remote access authorization anytime and anywhere. First, patients and doctors can use their biometric information to verify the authenticity of communication partners through real-time video communication technology. Second, a safety channel is provided in delivering their access authorization and secret data between patient and doctor. In the designed scheme, the user’s public key is authenticated by the corresponding biometric information without the help of public key infrastructure (PKI). Therefore, our proposed scheme does not have the costs of certificate storage, certificate delivery, and certificate revocation. In addition, the implementation time of our proposed system can be significantly reduced.

A high-performance triode-type carbon nanotube field emitter for mass production

Quy, Nguyen Van,Hoa, Nguyen Duc,An, Myungchan,Cho, Yousuk,Kim, Dojin IOP Pub 2007 Nanotechnology Vol.18 No.34

<P>A triode-type field emission device based on carbon nanotubes (CNTs) synthesized on an anodic aluminum oxide (AAO) template was fabricated. For the improvement of device performance, in addition to the basic advantages of using AAO to obtain uniform CNTs with strong adhesion, several considerations were taken into account, including highly crystalline CNTs synthesized through thermal chemical vapor deposition (CVD) at 1200 °C, lowering the contact resistance with a Ti buffer layer and reducing the pixel size and gate-to-emitter distance. The triode-type field emitter showed a high current density of 20 mA cm<SUP>−2</SUP> and a low turn-on voltage of 16 V. The very high field enhancement factor of 1.6 × 10<SUP>6</SUP> cm<SUP>−1</SUP> confirmed the high efficiency of the triode structure in electron extraction.</P>

Export Performance and Stock Return: A Case of Fishery Firms Listing in Vietnam Stock Markets

Quy Thi VO 한국유통과학회 2019 The Journal of Asian Finance, Economics and Busine Vol.6 No.4

The research aims to study the relationship between export performance and stock return of Vietnamese fishery companies. To conduct this study, quarterly data was collected for period from 2010-2018 of 13 fishery companies listing in Ho Chi Minh Stock Exchange (HOSE) and Ha Noi Stock Exchange (HNX). The export performance was measured by export intensity, export growth and export market coverage. In addition, interest rate, exchange rate, GDP, firm size, profitability, and financial leverage were considered as the control variables in the research model. Panel data analysis with Generalized Least Squares model was employed to estimate the predictive regression. The findings indicated that export intensity and export growth have a significant and positive relationship with stock returns. However, export market coverage has not a significant relationship with stock return at the 0.05 level. Profitability, financial leverage, and exchange rate have a positive relationship, while interest rate and GDP have no relation to stock return at the 0.05 significance level. The findings imply that investors should consider the export intensity instead of export growth and export market coverage as selecting stock of fishery exports firms to invest; managers should increase export intensity to increase company’s stock price or firm market value.