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| WoS | SCOPUS | Document Type | Document Title | Abstract | Authors | Affiliation | ResearcherID (WoS) | AuthorsID (SCOPUS) | Author Email(s) | Journal Name | JCR Abbreviation | ISSN | eISSN | Volume | Issue | WoS Edition | WoS Category | JCR Year | IF | JCR (%) | FWCI | FWCI Update Date | WoS Citation | SCOPUS Citation | Keywords (WoS) | KeywordsPlus (WoS) | Keywords (SCOPUS) | KeywordsPlus (SCOPUS) | Language | Publication Stage | Publication Year | Publication Date | DOI | JCR Link | DOI Link | WOS Link | SCOPUS Link |
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| ○ | ○ | Article | Enhanced Wi-Fi RTT Ranging: A Sensor-Aided Learning Approach | The fine timing measurement (FTM) protocol is designed to determine precise ranging between Wi-Fi devices using round-trip time (RTT) measurements. However, the multipath propagation of radio waves generates inaccurate timing information, degrading the ranging performance. In this study, we use a neural network (NN) to adaptively learn the unique measurement patterns observed at different indoor environments and produce enhanced ranging outputs from raw FTM measurements. Moreover, the NN is trained based on an unsupervised learning framework, using the naturally accumulated sensor data acquired from users accessing location services. Therefore, the effort involved in collecting training data is significantly minimized. The experimental results verified that the collection of unlabeled data for a short duration is sufficient to learn the pattern in raw FTM measurements and produce improved ranging results. The proposed method reduced the errors in raw distance measurements and well-calibrated ranging results requiring the collection of ground truth data by 47-50% and 17-29%, respectively. Consequently, positioning errors were reduced by 17-30% compared to the well-calibrated ranging scenario. | Choi, Jeongsik | Intel Corp, Intel Labs, Santa Clara, CA 95054 USA; Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea | ; Choi, Jeongsik/ABA-6906-2020 | 58534394200 | jeongsik.choi@knu.ac.kr; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 4 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 1.67 | 2025-06-25 | 14 | 19 | Distance measurement; Protocols; Wireless fidelity; Mobile handsets; Standards; Timing; Position measurement; fine timing measurement (FTM); Indoor positio- ning; inertial sensors; neural network; round-trip time (RTT) | INDOOR LOCALIZATION; FTM; ALGORITHM; TRACKING | fine timing measurement (FTM); Indoor positio- ning; inertial sensors; neural network; round-trip time (RTT) | Data acquisition; Distance measurement; Indoor positioning systems; Wi-Fi; Wireless local area networks (WLAN); Fine timing measurement; Indoor positioning; Inertial sensor; Learn+; Mobile handsets; Neural-networks; Round-trip time; Round-trip-time; Timing measurement; Wireless fidelities; Timing circuits | English | 2022 | 2022-04 | 10.1109/tvt.2022.3151018 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Joint Vehicle Tracking and RSU Selection for V2I Communications With Extended Kalman Filter | We develop joint vehicle tracking and road side unit (RSU) selection algorithms suitable for vehicle-to-infrastructure (V2I) communications. We first design an analytical framework for evaluating vehicle tracking systems based on the extended Kalman filter. A simple, yet effective, metric that quantifies the vehicle tracking performance is derived in terms of the angular derivative of a dominant spatial frequency. Second, an RSU selection algorithm is proposed to select a proper RSU that enhances the vehicle tracking performance. A joint vehicle tracking algorithm is also developed to maximize the tracking performance by considering sounding samples at multiple RSUs while minimizing the amount of sample exchange. The numerical results verify that the proposed vehicle tracking algorithms give better performance than conventional signal-to-noise ratio-based tracking systems. | Song, Jiho; Hyun, Seong-Hwan; Lee, Jong-Ho; Choi, Jeongsik; Kim, Seong-Cheol | Univ Ulsan, Sch Elect Engn, Ulsan 44610, South Korea; Seoul Natl Univ, Sch Elect Engn, Seoul 08826, South Korea; Inst New Media & Commun, Seoul 08826, South Korea; Soongsil Univ, Sch Elect Engn, Seoul 08826, South Korea; Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea | Choi, Jeongsik/ABA-6906-2020; Song, Jiho/ABD-7136-2021 | 56102704200; 57211342993; 55881843500; 58534394200; 22334016200 | jihosong@ulsan.ac.kr;shhyun@maxwell.snu.ac.kr;jongho.lee@ssu.ac.kr;jeong.sik.choi@knu.ac.kr;sckim@maxwell.snu.ac.kr; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 5 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 1.05 | 2025-06-25 | 10 | 12 | Radar tracking; Vehicle-to-infrastructure; Measurement; Channel estimation; Tracking; Signal to noise ratio; Kalman filters; Joint vehicle tracking; road side unit selection; extended Kalman filter; millimeter wave V2I communications | extended Kalman filter; Joint vehicle tracking; millimeter wave V2I communications; road side unit selection | Bandpass filters; Extended Kalman filters; Roads and streets; Signal to noise ratio; Tracking (position); Vehicle performance; Vehicle to vehicle communications; Joint vehicle tracking; Millimeter wave V2I communication; Road side unit selection; Road sides; Selection algorithm; Tracking algorithm; Tracking performance; Unit selection; V2I communications; Vehicle-to-infrastructure; Millimeter waves | English | 2022 | 2022-05 | 10.1109/tvt.2022.3153345 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Millimeter Wave Reflection Pattern Codebook Design for RIS-Assisted V2V Communications | We consider a reflection pattern (RP) designfor reconfigurable intelligent surface (RIS)-assisted vehicle-to-vehicle (V2V) communication systems. Fast-moving-vehicle environments necessitate developing more intuitive RP alignment technique that aligns a predefined codeword to the dominant channel directions. To support a fast RP alignment in RIS-assisted V2V systems, we provide a design guideline of the RP codebook by considering passive reflecting elements at the RIS. We analyze distributions of the incident and reflection channels by taking the street geometry in V2V networks into consideration. By using the statistical information on the difference in spatial frequencies between the incident and reflection channels, we define a set of ideal RPs that are likely to maximize a reflection beamforming gain. The RP codebook is constructed by designing a set of reflecting codewords that can generate actual RPs close to predefined ideal RPs. Numerical results verify that the proposed RP codebook provides a higher link gain than previously reported codebooks. | Song, Jiho; Lee, Jong-Ho; Noh, Song; Choi, Jeongsik | Univ Ulsan, Sch Elect Engn, Ulsan 44610, South Korea; Soongsil Univ, Sch Elect Engn, Seoul 06978, South Korea; Incheon Natl Univ, Dept Informat & Telecommun Engn, Incheon 22012, South Korea; Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea | Song, Jiho/ABD-7136-2021; Choi, Jeongsik/ABA-6906-2020 | 56102704200; 55881843500; 39362073300; 58534394200 | jihosong@ulsan.ac.kr;jongho.lee@ssu.ac.kr;songnoh@inu.ac.kr;jeong.sik.choi@knu.ac.kr; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 6 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 0.96 | 2025-06-25 | 9 | 11 | Channel estimation; Radio links; Frequency-domain analysis; Azimuth; Array signal processing; Virtual links; Surface waves; Millimeter wave systems; reconfigurable intelligent surface; reflection pattern design; V2V communications | INTELLIGENT SURFACES; PROPAGATION; BEAMWIDTH; CHANNELS | Millimeter wave systems; Reconfigurable intelligent surface; Reflection pattern design; V2V communications | Frequency domain analysis; Frequency estimation; Millimeter waves; Radio links; Vehicle to vehicle communications; Vehicles; Azimuth; Frequency-domain analysis; Millimeter-wave systems; Pattern designs; Reconfigurable; Reconfigurable intelligent surface; Reflection pattern design; Reflection patterns; V2V communications; Virtual Link; Surface waves | English | 2022 | 2022-06 | 10.1109/tvt.2022.3166183 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Optimal Power Allocation for Multiple Channels With One-Bit Analog-to-Digital Converters | In this study, an optimal power allocation over multiple noninterfering channels is derived for the case in which each channel uses two separate one-bit analog-to-digital converters for the real and imaginary parts respectively of the complex received signal. The optimization problem is formulated to determine the optimal transmit power allocation over multiple channels that maximizes the sum capacity. The solution of the optimization problem is explicitly determined by exploiting the Karush-Kuhn-Tucker conditions. The essential strategy for optimal power allocation is described with the corresponding mathematical results. Simulation results demonstrate that the derived power allocation is indeed optimal, as expected, and it achieves a significant gain compared to the case where an appropriate power allocation has not been used. | Min, Moonsik | Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Elect & Elect Engn, Daegu 41566, South Korea | 55386299100 | msmin@knu.ac.kr; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 4 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 0.26 | 2025-06-25 | 3 | 3 | Resource management; Receivers; Wireless communication; Optimization; Frequency division multiplexing; Linear programming; Analog-digital conversion; One-bit analog-to-digital converter; power allocation; Karush-Kuhn-Tucker condition; water filling | MASSIVE MIMO; SYSTEMS; UPLINK; CAPACITY | Karush-Kuhn-Tucker condition; One-bit analog-to-digital converter; power allocation; water filling | Optimization; Analog to digital converters; Karush Kuhn tucker condition; Multiple channels; One-bit analog-to-digital converter; Optimal power allocation; Optimization problems; Power allocations; Real and imaginary; Real part; Waterfilling; Analog to digital conversion | English | 2022 | 2022-04 | 10.1109/tvt.2022.3141117 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Performance Bound for MIMO Systems Using One-Bit ADCs Over Rayleigh Fading Channels | This study explores the performance of multiple-input multiple-output (MIMO) systems with one-bit analog-to-digital converters (ADCs) over Rayleigh fading channels. We particularly aim to characterize the pairwise error probability (PEP) achieved by maximum likelihood detection (MLD), which provides the optimal detection performance of the considered systems. First, the upper bound of the PEP is derived by leveraging Jensen's inequality and the Chernoff bound. The asymptotic bounds of the PEP are then characterized to clarify the impact of the one-bit ADCs on the diversity order of the MIMO systems. Notably, the diversity order of the MIMO systems with one-bit ADCs is the same as the number of receive antennas only when transmitting two symbol vectors with the opposite sign. Except for this special case, the asymptotic bound of the PEP is saturated at a high signal-to-noise ratio due to the use of the one-bit ADCs. Using simulations, we verify that the analytical results coincide with the asymptotic behavior of the PEP of the MLD for MIMO systems with one-bit ADCs over Rayleigh fading channels. | Kim, Tae-Kyoung; Min, Moonsik; Jeon, Yo-Seb | Gachon Univ, Dept Elect Engn, Seongnam 13120, South Korea; Kyungpook Natl Univ, Sch Elect Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Elect & Elect Engn, Daegu 41566, South Korea; Pohang Univ Sci & Technol POSTECH, Dept Elect Engn, Pohang Si 37673, Gyeongbuk, South Korea | Jeon, Yo-Seb/U-8637-2019 | 57216708769; 55386299100; 58254434200 | tk415kim@gmail.com;msmin@knu.ac.kr;yoseb.jeon@postech.ac.kr; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 8 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 0.44 | 2025-06-25 | 3 | 5 | MIMO communication; Symbols; Receiving antennas; Upper bound; Signal to noise ratio; Error probability; Channel capacity; Diversity order; maximum likelihood detection; MIMO system; one-bit ADCs; pairwise error probability | WAVE MASSIVE MIMO; UPLINK; COMMUNICATION; CAPACITY | Diversity order; maximum likelihood detection; MIMO system; one-bit ADCs; pairwise error probability | Analog to digital conversion; Bit error rate; Block codes; Channel capacity; Communication channels (information theory); Error detection; Fading channels; Maximum likelihood; MIMO systems; Rayleigh fading; Receiving antennas; Signal detection; Trellis codes; Analog to digital converters; Channel's capacity; Diversity order; Error probabilities; Maximum- likelihood detection; Multiple-Input Multiple- Output systems; Multiple-input multiple-output communications; One-bit analog-to-digital converter; Pairwise error probability; Symbol; Upper Bound; Signal to noise ratio | English | 2022 | 2022-08 | 10.1109/tvt.2022.3174714 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | SLAP-IoD: Secure and Lightweight Authentication Protocol Using Physical Unclonable Functions for Internet of Drones in Smart City Environments | With the emergence of the concept of smart city and the increasing demands for a range of drones, Internet of Drones (IoD) has achieved a variety of attention by providing multiple benefits in academia and industry. IoD offers numerous services, such as traffic monitoring, environmental monitoring, and disaster management by combining infrastructure, Internet of Things (IoT), and Flying Ad-Hoc Networks (FANET) in smart city environments. However, communication among drones is vulnerable to potential security threats because the sensitive messages in various applications are exchanged via an insecure channel in IoD-based smart city environments. Since IoDs can be operated in unattended environment with minimum human interventions, smart devices (e.g., drones and sensors) deployed in IoD architectures are vulnerable to physical capture attacks. In addition, drones are resource-constrained in terms of computation and communication overheads, and it is not much viable to apply public key cryptography (PKC) that requires high computation and communication overheads. Thus, we design a secure and lightweight authentication protocol using a physical unclonable function (PUF) for IoD to guarantee reliable and useful services in smart city environments, called SLAP-IoD. We prove the security of the SLAP-IoD using informal and formal security analyses using the broadly recognized Real-Or-Random (ROR) random oracle model, and also through the formal security verification using the widely-accepted Automated Validation of Internet Security-sensitive Protocols and Applications (AVISPA) security verification. Furthermore, we compare the performance of the SLAP-IoD with related schemes. Consequently, we show that SLAP-IoD offers better security and efficiency than other related schemes and is suitable for IoD-based smart city environments. | Yu, Sungjin; Das, Ashok Kumar; Park, Youngho; Lorenz, Pascal | Kyungpook Natl Univ, Sch Elect & Elect Engn, Daegu 41566, South Korea; Elect & Telecommun Res Inst, Daejeon 34129, South Korea; Int Inst Informat Technol, Ctr Secur Theory & Algorithm Res, Hyderabad 500032, India; Old Dominion Univ, Virginia Modeling Anal & Simulat Ctr, Suffolk, VA 23435 USA; Univ Haute Alsace, F-68008 Colmar, France | ; , LORENZ/ABH-9737-2020; Das, Ashok Kumar/U-2790-2019 | 57203974524; 55450732800; 56962990300; 7101942080 | sj.yu@etri.re.kr;ashok.das@iiit.ac.in;parkyh@knu.ac.kr;lorenz@ieee.org; | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY | IEEE T VEH TECHNOL | 0018-9545 | 1939-9359 | 71 | 10 | SCIE | ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS;TRANSPORTATION SCIENCE & TECHNOLOGY | 2022 | 6.8 | 14.0 | 7.1 | 2025-06-25 | 60 | 82 | Security; Smart cities; Authentication; Drones; Protocols; Passwords; Privacy; Physical unclonable functions (PUF); internet of drones (IoD); smart city; authentication; security protocol | KEY AGREEMENT SCHEME; 2-FACTOR USER AUTHENTICATION; ACCESS-CONTROL SCHEME; SURVEILLANCE; EFFICIENT; EXCHANGE; DESIGN | authentication; internet of drones (IoD); Physical unclonable functions (PUF); security protocol; smart city | Ad hoc networks; Authorization; Disaster prevention; Disasters; Drones; Environmental management; Hardware security; Internet of things; Internet protocols; Network security; Public key cryptography; Security systems; Smart city; Communication overheads; Computation overheads; Internet of drone; Lightweight authentication protocols; Password; Physical unclonable function; Privacy; Security; Security protocols; Security verification; Authentication | English | 2022 | 2022-10 | 10.1109/tvt.2022.3188769 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Assimilation of GPM-retrieved ocean surface meteorology data for two snowstorm events during ICE-POP 2018 | As a component of the National Aeronautics and Space Administration's (NASA's) Weather Focus Area and Global Precipitation Measurement (GPM) Ground Validation participation in the International Collaborative Experiments for the PyeongChang 2018 Olympic and Paralympic Winter Games' (ICE-POP 2018) field research and forecast demonstration programs, hourly ocean surface meteorology properties were retrieved from the GPM microwave observations for January-March 2018. In this study, the retrieved ocean surface meteorological products - 2 m temperature, 2 m specific humidity, and 10 m wind speed - were assimilated into a regional numerical weather prediction (NWP) framework. This explored the application of these observations for two heavy snowfall events during the ICE-POP 2018, on 27-28 February and 7-8 March 2018. The Weather Research and Forecasting (WRF) model and the community Gridpoint Statistical Interpolation (GSI) were used to conduct high-resolution simulations and data assimilation experiments. The results indicate that the data assimilation has a large influence on surface thermodynamic and wind fields in the model initial condition for both events. With cycled data assimilation, a significantly positive influence of the retrieved surface observation was found for the March case, with improved quantitative precipitation forecasts and reduced errors in temperature forecasts. A slightly smaller yet positive impact was also found in the forecast for the February case. | Li, Xuanli; Roberts, Jason B.; Srikishen, Jayanthi; Case, Jonathan L.; Petersen, Walter A.; Lee, Gyuwon; Hain, Christopher R. | Univ Alabama, Earth Syst Sci Ctr, Huntsville, AL 35899 USA; NASA, Marshall Space Flight Ctr, Huntsville, AL USA; Univ Space Res Assoc, Sci & Technol Inst, Huntsville, AL USA; NASA, ENSCO Inc, SPoRT Ctr, Huntsville, AL USA; Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Ctr Atmospher REmote Sensing CARE, Daegu, South Korea | Hain, Christopher/ABE-7127-2020; Hain, Christopher/G-3512-2012 | 24066817400; 55419044600; 15519928000; 7103347548; 7102643810; 7404852271; 57203255846 | xuanli@nsstc.uah.edu; | GEOSCIENTIFIC MODEL DEVELOPMENT | GEOSCI MODEL DEV | 1991-959X | 1991-9603 | 15 | 13 | SCIE | GEOSCIENCES, MULTIDISCIPLINARY | 2022 | 5.1 | 14.1 | 0 | 2025-06-25 | 0 | 0 | VARIATIONAL DATA ASSIMILATION; WINTER STORM FORECASTS; PART II; PRECIPITATION; SYSTEM; MODEL; IMPACT; MICROPHYSICS; CLIMATOLOGY; CONVECTION | data assimilation; interpolation; numerical model; Olympic Games; precipitation (climatology); prediction; thermodynamics; weather forecasting; wind velocity | English | 2022 | 2022-07-12 | 10.5194/gmd-15-5287-2022 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Simulated microphysical properties of winter storms from bulk-type microphysics schemes and their evaluation in the Weather Research and Forecasting (v4.1.3) model during the ICE-POP 2018 field campaign | This study evaluates the performance of four bulk-type microphysics schemes, Weather Research and Forecasting (WRF) double-moment 6-class (WDM6), WRF double-moment 7-class (WDM7), Thompson, and Morrison, focusing on hydrometeors and microphysics budgets in the WRF model version 4.1.3. Eight snowstorm cases, which can be sub-categorized as cold-low, warm-low, and air-sea interaction cases are selected, depending on the synoptic environment during the International Collaborative Experiment for Pyeongchang Olympics and Paralympics (ICE-POP 2018) field campaign. All simulations present a positive bias in the simulated surface precipitation for cold-low and warmlow cases. Furthermore, the simulations for the warm-low cases show a higher probability of detection score than simulations for the cold-low and air-sea interaction cases even though the simulations fail to capture the accurate transition layer for wind direction. WDM6 and WDM7 simulate abundant cloud ice for the cold-low and warm-low cases, and thus snow is mainly generated by aggregation. Meanwhile, Thompson and Morrison schemes simulate insignificant cloud ice amounts, especially over the lower atmosphere, where cloud water is simulated instead. Snow in the Thompson and Morrison schemes is mainly formed by the accretion between snow and cloud water and deposition. The melting process is analyzed as a key process to generate rain in all schemes. The discovered positive precipitation bias for the warm-low and cold-low cases can be mitigated by reducing the melting efficiency in all schemes. The contribution of melting to rain production is reduced for the air-sea interaction case with decreased solid-phase hydrometeors and increased cloud water in all simulations. | Ko, Jeong-Su; Lim, Kyo-Sun Sunny; Kim, Kwonil; Lee, Gyuwon; Thompson, Gregory; Berne, Alexis | Kyungpook Natl Univ, Ctr Atmospher Remote Sensing CARE, Dept Atmospher Sci, Daegu, South Korea; Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; Ecole Polytech Fed Lausanne EPFL, Environm Remote Sensing Lab LTE, Lausanne, Switzerland | Lim, Kyo-Sun/I-3811-2012; Kim, Kwonil/HTN-0103-2023 | 57282452500; 57211926026; 57191964318; 7404852271; 7403077486; 8573340700 | kyosunlim@knu.ac.kr; | GEOSCIENTIFIC MODEL DEVELOPMENT | GEOSCI MODEL DEV | 1991-959X | 1991-9603 | 15 | 11 | SCIE | GEOSCIENCES, MULTIDISCIPLINARY | 2022 | 5.1 | 14.1 | 0.5 | 2025-06-25 | 5 | 5 | FALL SPEEDS; PART I; PRECIPITATION; SNOWFALL; RADAR; CLOUDS; VELOCITY; IMPACTS; PARAMETERIZATIONS; CLASSIFICATION | English | 2022 | 2022-06-13 | 10.5194/gmd-15-4529-2022 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||||
| ○ | ○ | Article | Astrocyte-derived adenosine excites sleep-promoting neurons in the ventrolateral preoptic nucleus: Astrocyte-neuron interactions in the regulation of sleep | Although ATP and/or adenosine derived from astrocytes are known to regulate sleep, the precise mechanisms underlying the somnogenic effects of ATP and adenosine remain unclear. We selectively expressed channelrhodopsin-2 (ChR2), a light-sensitive ion channel, in astrocytes within the ventrolateral preoptic nucleus (VLPO), which is an essential brain nucleus involved in sleep promotion. We then examined the effects of photostimulation of astrocytic ChR2 on neuronal excitability using whole-cell patch-clamp recordings in two functionally distinct types of VLPO neurons: sleep-promoting GABAergic projection neurons and non-sleep-promoting local GABAergic neurons. Optogenetic stimulation of VLPO astrocytes demonstrated opposite outcomes in the two types of VLPO neurons. It led to the inhibition of non-sleep-promoting neurons and excitation of sleep-promoting neurons. These responses were attenuated by blocking of either adenosine A(1) receptors or tissue-nonspecific alkaline phosphatase (TNAP). In contrast, exogenous adenosine decreased the excitability of both VLPO neuron populations. Moreover, TNAP was expressed in galanin-negative VLPO neurons, but not in galanin-positive sleep-promoting projection neurons. Taken together, these results suggest that astrocyte-derived ATP is converted into adenosine by TNAP in non-sleep-promoting neurons. In turn, adenosine decreases the excitability of local GABAergic neurons, thereby increasing the excitability of sleep-promoting GABAergic projection neurons. We propose a novel mechanism involving astrocyte-neuron interactions in sleep regulation, wherein endogenous adenosine derived from astrocytes excites sleep-promoting VLPO neurons, and thus decreases neuronal excitability in arousal-related areas of the brain. | Choi, In-Sun; Kim, Jae-Hong; Jeong, Ji-Young; Lee, Maan-Gee; Suk, Kyoungho; Jang, Il-Sung | Kyungpook Natl Univ, Sch Dent, Dept Pharmacol, Daegu, South Korea; Kyungpook Natl Univ, Sch Med, Dept Pharmacol, Daegu, South Korea; Kyungpook Natl Univ, Brain Sci & Engn Inst, Daegu 41940, South Korea | 8414266600; 55926599800; 57194441446; 7409123157; 7005114595; 7102177910 | mglee@knu.ac.kr;ksuk@knu.ac.kr;jis7619@knu.ac.kr; | GLIA | GLIA | 0894-1491 | 1098-1136 | 70 | 10 | SCIE | NEUROSCIENCES | 2022 | 6.2 | 14.2 | 2.12 | 2025-06-25 | 23 | 23 | adenosine; astrocyte; gliotransmitters; optogenetics; sleep; ventrolateral preoptic nucleus | GALANINERGIC NEURONS; ATP; RECEPTORS; AREA; RELEASE; HEMICHANNELS; TRANSMISSION; PHOSPHATASE; MODULATION; HISTAMINE | adenosine; astrocyte; gliotransmitters; optogenetics; sleep; ventrolateral preoptic nucleus | Adenosine; Adenosine Triphosphate; Astrocytes; GABAergic Neurons; Galanin; Preoptic Area; 4 aminobutyric acid receptor; adenosine; adenosine A1 receptor; adenosine triphosphate; alkaline phosphatase; channelrhodopsin; channelrhodopsin 2; galanin; ion channel; unclassified drug; 4 aminobutyric acid receptor; adenosine; adenosine triphosphate; galanin; action potential; adult; animal experiment; arousal; Article; astrocyte; controlled study; current density; excitation; GABAergic transmission; hyperpolarization; male; membrane current; membrane potential; motor activity; nerve cell; nerve cell excitability; nonhuman; optogenetics; photostimulation; protein expression; rat; regulatory mechanism; room temperature; sleep; sleep waking cycle; slice culture; ventrolateral preoptic nucleus; voltage clamp technique; whole cell patch clamp; astrocyte; physiology; preoptic area | English | 2022 | 2022-10 | 10.1002/glia.24225 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Big data simulation for effective thermal conductivity modeling of thermosyphon | Thermosyphon or thermosiphon has been continuously studied for various thermal engineering applications in terms of large heat delivery and removal. Their thermal resistances have been investigated as they are the key to infer the effective thermal conductivity in thermal systems. This study aims to provide an essential basis or modeling equation to design a thermal system to estimate the effective thermal conductivity with thermal resistance. Collecting big data using computational fluid dynamics is newly introduced to examine the thermosyphon, which cannot be tested in an experiment. More than 36,000 simulation cases are conducted by changing total length, radius, heat sink area, heater area, heat transfer coefficient at heat sink, and power of the heater. Selected cases cover the actual ranges by referring to existing experimental or numerical results in other literature. As a result of numerical analysis, a correlation between thermosyphon morphology, thermal resistance, and effective thermal conductivity is derived. The Deep Neural Network (DNN) is employed to validate the simulation data. It is confirmed that the results are consistent and verifiable. These results open a way as we can see that the effective thermal conductivity is a function of geometry and complex function of heat power or heat transfer coefficient. This correlation model is expected to play an essential role in designing thermal systems. | Kim, Myeongjin; Moon, Joo Hyun | Kyungpook Natl Univ, Dept Hydrogen & Renewable Energy, Daegu, South Korea; Sejong Univ, Dept Mech & Aerosp Engn, Daegu, South Korea | Moon, Joo/AAN-3395-2021 | 55541419000; 56388836900 | jhmoon9@sejong.ac.kr; | THERMAL SCIENCE AND ENGINEERING PROGRESS | THERM SCI ENG PROG | 2451-9049 | 31 | SCIE | ENERGY & FUELS;ENGINEERING, MECHANICAL;MECHANICS;THERMODYNAMICS | 2022 | 4.8 | 14.2 | 0.2 | 2025-06-25 | 2 | 3 | Computational fluid dynamics; Effective thermal conductivity; Modeling; Thermal resistance; Thermosyphon | 2-PHASE CLOSED THERMOSIPHON; HEAT-TRANSFER CHARACTERISTICS; PERFORMANCE; PIPES | Computational fluid dynamics; Effective thermal conductivity; Modeling; Thermal resistance; Thermosyphon | Big data; Deep neural networks; Heat resistance; Heat sinks; Heat transfer coefficients; Siphons; Thermal conductivity; Thermal Engineering; Thermosyphons; Data simulation; Effective thermal conductivity; Effective thermal conductivity models; Engineering applications; Heat power; Heat transfer co-efficients; Modeling; Thermal engineering; Thermal systems; Thermosiphon; Computational fluid dynamics | English | 2022 | 2022-06-01 | 10.1016/j.tsep.2022.101293 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Cathelicidin-related antimicrobial peptide promotes neuroinflammation through astrocyte-microglia communication in experimental autoimmune encephalomyelitis | Cathelicidin-related antimicrobial peptide (CRAMP) is an effector molecule of the innate immune system with direct antimicrobial and immunomodulatory activities; however, its role in neuroinflammatory responses and related diseases is not clearly understood. In particular, the expression of CRAMP and its functional role has not been previously studied in experimental autoimmune encephalomyelitis (EAE) or multiple sclerosis (MS). Here, we investigated the role of CRAMP in neuroinflammation, using an EAE mouse model of MS and postmortem patient tissues. We found that the CRAMP expression was increased in the spinal cords of EAE-induced mice. Immunofluorescence analysis revealed that CRAMP is mainly induced in reactive astrocytes in the inflamed spinal cord of EAE mice. A similar pattern of the LL-37 (human CRAMP) expression was observed in the brain and spinal cord tissues of patients with MS. An intrathecal injection of the CRAMP peptide in EAE mice accelerated the onset of symptoms and increased disease severity with augmented expression of inflammatory mediators, glial activation, infiltration of inflammatory cells, and demyelination. In addition, shRNA-mediated knockdown of Cramp in the spinal cord resulted in a milder disease course with less inflammation in EAE mice. We identified FPR2 on microglia as a CRAMP receptor and demonstrated that CRAMP potentiates IFN-gamma-induced microglial activation via the STAT3 pathway. Taken together, our findings suggest that CRAMP is a novel mediator of astrocyte-microglia interactions in neuroinflammatory conditions such as EAE. Thus, CRAMP could be exploited as a biomarker or therapeutic target for the diagnosis or treatment of MS. | Bhusal, Anup; Nam, Youngpyo; Seo, Donggun; Rahman, Md Habibur; Hwang, Eun Mi; Kim, Seung-Chan; Lee, Won-Ha; Suk, Kyoungho | Kyungpook Natl Univ, Sch Med, Dept Pharmacol, Daegu 41944, South Korea; Kyungpook Natl Univ, Sch Med, Dept Biomed Sci, BK21 Plus KNU Biomed Convergence Program, Daegu, South Korea; Rutgers Robert Wood Johnson Med Sch, Div Endocrinol, Dept Med, New Brunswick, NJ USA; Korea Inst Sci & Technol, Brain Sci Inst, Seoul, South Korea; Kyungpook Natl Univ, Sch Life Sci, BK21 FOUR KNU Creat BioRes Grp, Daegu, South Korea; Kyungpook Natl Univ, Brain Sci & Engn Inst, Daegu, South Korea | ; Rahman, Md Habibur/AAF-3094-2021; Hwang, Eun Mi/HHN-3030-2022; Kim, Hyun Jung/GQP-3241-2022 | 57200274141; 55143100300; 57207584467; 59607139800; 7101826741; 57204605658; 57205609794; 7005114595 | ksuk@knu.ac.kr; | GLIA | GLIA | 0894-1491 | 1098-1136 | 70 | 10 | SCIE | NEUROSCIENCES | 2022 | 6.2 | 14.2 | 1.41 | 2025-06-25 | 15 | 14 | astrocyte; cathelicidin; formyl peptide receptor; microglia; multiple sclerosis; neuroinflammation | LUNG MUCOSAL IMMUNITY; RECEPTOR-LIKE 1; MACROPHAGE DIFFERENTIATION; MULTIPLE-SCLEROSIS; LL-37; ACTIVATION; CELLS; EXPRESSION; CRAMP; RESPONSES | astrocyte; cathelicidin; formyl peptide receptor; microglia; multiple sclerosis; neuroinflammation | Animals; Antimicrobial Cationic Peptides; Antimicrobial Peptides; Astrocytes; Communication; Encephalomyelitis, Autoimmune, Experimental; Humans; Inflammation; Mice; Mice, Inbred C57BL; Microglia; Multiple Sclerosis; Neuroinflammatory Diseases; Spinal Cord; biological marker; cathelicidin related antimicrobial peptide; eosin; gamma interferon; hematoxylin; interleukin 1beta; interleukin 6; messenger RNA; nitric oxide; peptide; ropocamptide; short hairpin RNA; STAT3 protein; tumor necrosis factor; unclassified drug; antimicrobial cationic peptide; polypeptide antibiotic agent; Adeno associated virus; adult; animal cell; animal experiment; animal model; animal tissue; Article; astrocyte; brain histology; cell activation; cell communication; cell infiltration; cell viability; cellular distribution; cerebellum; controlled study; disease classification; disease severity; enzyme linked immunosorbent assay; gene knockdown; glia cell; human; immunocompetent cell; immunofluorescence; immunohistochemistry; immunoreactivity; limit of quantitation; lymph node; lymphocytic infiltration; male; microglia; MOG-induced experimental autoimmune encephalomyelitis; mouse; MTT assay; multiple sclerosis; nervous system inflammation; neuropathology; neutrophil; nonhuman; phenotype; promoter region; protein expression; protein expression level; protein function; real time reverse transcription polymerase chain reaction; reverse transcription polymerase chain reaction; sex difference; signal transduction; spinal cord; spleen; upregulation; Western blotting; animal; astrocyte; C57BL mouse; experimental autoimmune encephalomyelitis; inflammation; interpersonal communication; metabolism; microglia; multiple sclerosis | English | 2022 | 2022-10 | 10.1002/glia.24227 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Correction | Selection strategy for damping-of resistance gene by biotechnology in rice plant (Mar, 10.1007/s11104-022-05334-3, 2022) | Park, Jae-Ryoung; Kim, Eun-Gyeong; Jang, Yoon-Hee; Yun, Byoung-Ju; Kim, Kyung-Min | Kyungpook Natl Univ, Coll Agr & Life Sci, Sch Appl Biosci, Div Plant Biosci, Daegu 41566, South Korea; Rural Dev Adm, Natl Inst Crop Sci, Crop Breeding Div, Wonju 55365, South Korea; Kyungpook Natl Univ, Coll IT Engn, Sch Elect & Elect Engn, 80 Daehak Ro, Daegu 41566, South Korea | Kim, Kyung-Min Kim/C-7007-2014 | 57211205505; 57221496070; 57219901992; 7006416932; 34868260300 | bjisyun@knu.ac.kr;kkm@knu.ac.kr; | PLANT AND SOIL | PLANT SOIL | 0032-079X | 1573-5036 | 474 | 1-2 | SCIE | AGRONOMY;PLANT SCIENCES;SOIL SCIENCE | 2022 | 4.9 | 14.2 | 0 | 2025-06-25 | 0 | 0 | English | 2022 | 2022-05 | 10.1007/s11104-022-05361-0 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||||||
| ○ | ○ | Article | Selection strategy for damping-off resistance gene by biotechnology in rice plant | Aims The gradual decline in rice yield is a trend closely related to the occurrence of various pathogens, especially Pythium graminicola and Rhizoctonia solani; these are major soil-borne pathogens that cause the plant disease damping-off, which seriously damages seed germination and growth worldwide. Methods After treatment with P. graminicola and Rhophitulus solani in 120 Cheongcheong/Nagdong double haploid (CNDH) populations, they were divided into a resistant group and a susceptible group, and finally the damping-off resistance gene was mapped using the genotype and phenotype. And then, the expression level of OsDGTq1 screened was analyzed. Results Using the genotypes/phenotypes of the 120 CNDH populations, loci that induced resistance to P. graminicola and R. solani were detected simultaneously in RM11849-RM212 on chromosome 1 and RM27242-RM2698 on chromosome 11. In these areas, open reading frames related to the cell wall, cell death, signaling, and secondary metabolites affecting plant defense were searched. The relative expression levels of these open reading frames were analyzed after P. graminicola and R. solani inoculation; OsDGTq1 expression increased sharply in the resistance population relative to the susceptible population at the initial stage after pathogen inoculation. Conclusions These results suggest that OsDGTq1 reacts rapidly to the initial stage of inoculation when pathogens attack and is involved in cell wall synthesis, which induces systemic acquired resistance. Hence, OsDGTq1 could potentially be used to develop damping-off resistant rice cultivars that improve yield at the early stages of rice growth. | Park, Jae-Ryoung; Kim, Eun-Gyeong; Jang, Yoon-Hee; Yun, Byoung-Ju; Kim, Kyung-Min | Kyungpook Natl Univ, Coll Agr & Life Sci, Sch Appl Biosci, Div Plant Biosci, Daegu 41566, South Korea; Rural Dev Adm, Crop Breeding Div, Natl Inst Crop Sci, Wonju 55365, South Korea; Kyungpook Natl Univ, Coll IT Engn, Sch Elect & Elect Engn, 80 Daehak Ro, Daegu 41566, South Korea | ; Kim, Kyung-Min Kim/C-7007-2014 | 57211205505; 57221496070; 57219901992; 7006416932; 34868260300 | bjisyun@knu.ac.kr;kkm@knu.ac.kr; | PLANT AND SOIL | PLANT SOIL | 0032-079X | 1573-5036 | 474 | 1-2 | SCIE | AGRONOMY;PLANT SCIENCES;SOIL SCIENCE | 2022 | 4.9 | 14.2 | 0.2 | 2025-06-25 | 3 | 2 | Damping-off; Pythium graminicola; Rhizoctonia solani; Rice; Plant defense | YIELD DECLINE; ENCODES; ENZYMES; GROWTH | Damping-off; Plant defense; Pythium graminicola; Rhizoctonia solani; Rice | biotechnology; cell component; chromosome; disease; genotype; germination; growth; inoculation; plant defense | English | 2022 | 2022-05 | 10.1007/s11104-022-05334-3 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Applying the TRIRISK model to COVID-19 in tourism: A comparison between 2020 and 2021 | In this study, we adapted a TRIRISK model developed in the medical field for deployment in the tourism domain. Structural equation modeling was used to investigate the roles of the deliberative, affective, and experiential dimensions of perceived risk and the perceived severity of COVID-19 in predicting travel avoidance intentions. An analysis of covariance was conducted to determine whether the study variables differ by period and demographic factors. The study makes three major contributions to the literature, namely, the development of an instrument to measure the impact of the COVID-19 pandemic on travel avoidance intentions; the testing of models that identified the relationships between the perceived risk of contracting the virus, expected severity of the medical and psychosocial consequences emanating from this risk, and travel avoidance intentions; and an evaluation of the initial appraisal of differences among sociodemographic cohorts in response to the study variables for 2020 and 2021. | Jeong, Ji Youn; Crompton, John L.; Lee, Kyung-Yur | Kyungpook Natl Univ, Dept Tourism, 2559 Gyeongsang Daero, Sangju 37224, South Korea; Texas A&M Univ, 600 John Kimbrough Blvd,Suite 445, College Stn, TX 77843 USA; Hanyang Cyber Univ, Dept Tourism & Airline Management, 220 Wangsimni Ro, Seoul 04763, South Korea | Jeong, Ji Youn/KBB-3881-2024 | 57190002456; 57204337546; 57210286937 | jjeong@knu.ac.kr;jcrompton@tamu.edu;kyungyur@gmail.com; | TOURISM MANAGEMENT PERSPECTIVES | TOUR MANAG PERSPECT | 2211-9736 | 2211-9744 | 41 | SSCI | HOSPITALITY, LEISURE, SPORT & TOURISM;MANAGEMENT | 2022 | 8.7 | 14.3 | 0.45 | 2025-06-25 | 7 | 7 | Perception change; COVID-19; Perceived risk; Perceived severity; Travel avoidance intentions | RISK PERCEPTIONS; WORRY; BEHAVIOR | COVID-19; Perceived risk; Perceived severity; Perception change; Travel avoidance intentions | English | 2022 | 2022-01 | 10.1016/j.tmp.2022.100936 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Changes in the characteristics of community-onset fluoroquinolone-resistant Escherichia coli isolates causing community-acquired acute pyelonephritis in South Korea | Purpose: This study aimed to examine the changes in the characteristics of community-onset fluoroquinolone-resist ant (FQ-R) Escherichia coli isolates causing community-acquired acute pyelonephritis (APN) in South Korea. Methods: Blood or urine samples were prospectively collected from patients aged > 15 years with community-acquired APN who were admitted to one of the eight Korean hospitals included in this study between September 2017 and August 2018. Phylogenetic typing, multi -locus sequence typing, and molecular characterization of 13-lactamase resistance and plasmid-mediated quinolone resistance (PMQR) determinants were performed. The data were compared with those from a previous study with the same design conducted in 2010-2011. Results: A total of 300 and 346 isolates were identified in 2010-2011 and 2017-2018, respec-tively. Among them, 76 (22.0%) and 77 (25.7%) FQ-R isolates were identified in 2010-2011 and 2017-2018, respectively. A significantly higher antimicrobial resistance against third-to fourth -generation cephalosporins, including cefotaxime (23.9% vs. 77.9%, P < 0.001), were observed among FQ-R isolates in 2017-2018 than among those in 2010-2011. A higher proportion of ST131 isolates (27.6% vs. 66.2%, P < 0.001), as well as isolates that had extended-spectrum 13-lactamase (ESBL)/plasmid-mediated AmpC 13-lactamase (PABL) (23.7% vs. 79.2%, P < 0.001), was observed in 2017-2018 than in 2010-2011. Further, more PMQR determinants (11.8% vs. 40.8%, P < 0.001) were observed in 2017-2018 than in 2010-2011. Conclusions: Among uropathogenic FQ-R E. coli isolates in South Korea, the prevalence of ST131 and the proportion of isolates containing ESBL and/or PMQR determinants have increased. Copyright 2022, Taiwan Society of Microbiology. Published by Elsevier Taiwan LLC. | Kim, Bongyoung; Kim, Jeoungyeon; Jo, Hyun-uk; Kwon, Ki Tae; Ryu, Seong-yeol; Wie, Seong-Heon; Kim, Jieun; Park, Se Yoon; Hong, Kyung-Wook; Kim, Hye In; Bae, Mi Hyun; Kim, Hyun ah; Kim, Mi-Hee; Sohn, Yong-Hak; Lee, Yangsoon; Pai, Hyunjoo | Hanyang Univ, Coll Med, Dept Internal Med, Seoul, South Korea; Good Moonhwa Hosp, Dept Urol, Pusan, South Korea; Kyungpook Natl Univ, Sch Med, Dept Internal Med, Daegu, South Korea; Keimyung Univ, Dept Internal Med, Dongsan Med Ctr, Daegu, South Korea; Catholic Univ Korea, St Vincent Hosp, Coll Med, Dept Internal Med, Seoul, South Korea; Soonchunhyang Univ, Coll Med, Seoul Hosp, Dept Internal Med, Seoul, South Korea; Gyeongsang Natl Univ Hosp, Sch Med, Dept Internal Med, Div Infect Dis, Seoul, South Korea; Daegu Fatima Hosp, Dept Internal Med, Daegu, South Korea; Hanyang Univ, Coll Med, Dept Lab Med, Seoul, South Korea; Seegene Med Fdn, Seoul, South Korea; Soonchunhyang Univ, Coll Med, Dept Lab Med, Seoul Hosp, Seoul, South Korea; Hanyang Univ, Dept Internal Med, Coll Med, 222-1 Wangsimni ro, Seoul 04763, South Korea | Kim, Ji/AAU-5043-2020; Hwang, Soyoon/HHM-5762-2022; Kim, Woo/AAG-1822-2019; Hong, Kyung-Wook/T-3067-2018; Kim, Jong/K-3445-2013; Lee, Yangsoon/C-9751-2015 | 55622077200; 57446185100; 57219027371; 9733850500; 9733513600; 12796392700; 56528660800; 55259986400; 38461203300; 57208153832; 57059615500; 56001471000; 57032150100; 35270009900; 56107271700; 57225132406 | sobakas@hanyang.ac.kr;paihj@hanyang.ac.kr; | JOURNAL OF MICROBIOLOGY IMMUNOLOGY AND INFECTION | J MICROBIOL IMMUNOL | 1684-1182 | 1995-9133 | 55 | 4 | SCIE | IMMUNOLOGY;INFECTIOUS DISEASES;MICROBIOLOGY | 2022 | 7.4 | 14.4 | 0.64 | 2025-06-25 | 6 | 6 | Urinary tract infection; Escherichia coli; Antimicrobial resistance; ST131; Korea | Antimicrobial resistance; Escherichia coli; Korea; ST131; Urinary tract infection | Anti-Bacterial Agents; beta-Lactamases; Escherichia coli Infections; Fluoroquinolones; Humans; Multilocus Sequence Typing; Phylogeny; Pyelonephritis; Quinolones; Uropathogenic Escherichia coli; adhesin; amikacin; ampicillin; beta lactamase AmpC; cefepime; cefotaxime; ceftazidime; cephalosporin derivative; ciprofloxacin; cotrimoxazole; gentamicin; levofloxacin; siderophore; tobramycin; toxin; virulence factor; antiinfective agent; beta lactamase; quinolone derivative; acute pyelonephritis; adult; antibiotic resistance; Article; blood culture; blood sampling; community acquired infection; controlled study; extended spectrum beta lactamase producing Escherichia coli; female; fluoroquinolone resistant Escherichia coli; hospital patient; human; in vitro study; major clinical study; male; MIC50; MIC90; molecular epidemiology; multicenter study; multilocus sequence typing; multiplex polymerase chain reaction; nonhuman; prevalence; prospective study; South Korea; urine culture; urine sampling; uropathogenic Escherichia coli; Escherichia coli infection; phylogeny; pyelonephritis; uropathogenic Escherichia coli | English | 2022 | 2022-08 | 10.1016/j.jmii.2022.01.001 | 바로가기 | 바로가기 | 바로가기 | 바로가기 |
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