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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 | Loading Direction Dependence of Yield-Point Phenomenon and Bauschinger Effect in API X70 Steel Sheet | In this study, variations in the tensile behavior and Bauschinger effect with the applied loading direction in an American Petroleum Institute (API) X70 steel sheet are investigated by conducting tensile and strain-reversal tests along the rolling direction (RD), the transverse direction (TD), and a direction inclined at an angle of 45 degrees from the RD to the TD (45D). The microstructure of the rolled steel sheet consists of polygonal ferrite and acicular ferrite, and it has a rolling texture that is typical of body-centered cubic metal materials. During tensile deformation, the yield-point phenomenon, which involves occurrence of discontinuous yielding and development of Luders strain, occurs in all the loading directions. However, the material shows a lower yield strength and larger Luders strain under tension along the 45D than under tension along the RD and TD. The Bauschinger effect, which occurs under subsequent reversal tension after compression, is also more pronounced under loading along the 45D. These results are attributed to the fact that dislocation slips are activated more easily under deformation along the 45D, which is evidenced by the lower Taylor factor and larger number of active slip systems under loading along the 45D. Furthermore, results of viscoplastic self-consistent simulation reveal that along all the directions, the {112} slip system is vigorously activated during tensile and compressive deformations and that its activation plays an important role in the deformation behavior and yield strength of the material. Graphic | Kim, Hyung Lae; Park, Sung Hyuk | KAERI, SMR Fuel Dev Team, Deajeon 34057, South Korea; Kyungpook Natl Univ, Sch Mat Sci & Engn, Daegu 41566, South Korea | Park, Sung-Hyuk/AAE-6726-2022 | 57191363167; 54786002500 | sh.park@knu.ac.kr; | METALS AND MATERIALS INTERNATIONAL | MET MATER INT | 1598-9623 | 2005-4149 | 26 | 1 | SCIE | MATERIALS SCIENCE, MULTIDISCIPLINARY;METALLURGY & METALLURGICAL ENGINEERING | 2020 | 3.642 | 19.4 | 0.98 | 2025-06-25 | 12 | 16 | Line-pipe steel; Mechanical properties; Bauschinger effect; Texture; Dislocation slip | TEXTURE DEVELOPMENT; ROLLING TEXTURES; DEFORMATION; STRAIN; MODEL; SLIP; MICROSTRUCTURE; FERRITE; METALS; HOT | Bauschinger effect; Dislocation slip; Line-pipe steel; Mechanical properties; Texture | Deformation; Ferrite; Mechanical properties; Metals; Polypropylenes; Rolling; Steel sheet; Tensile strength; Textures; Yield stress; American Petroleum Institute; Bauschinger effects; Compressive deformations; Discontinuous yielding; Dislocation slip; Linepipe steel; Strain reversal tests; Visco-plastic self-consistent; Strength of materials | English | 2020 | 2020-01 | 10.1007/s12540-019-00325-z | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Molecular Imprinting of Bisphenol A on Silica Skeleton and Gold Pinhole Surfaces in 2D Colloidal Inverse Opal through Thermal Graft Copolymerization | This study successfully fabricated BPA-imprinted poly(4-vinylpyridine-co-ethylene glycol dimethacrylate) (poly(4-VP-co-EGDMA)) quartz crystal microbalance (MIP-QCM) sensors on a silica skeleton surface and gold pinholes of silica inverse opal through surface-initiated atom transfer radical polymerization (SI-ATRP). The sensing features of the two MIP films on the structured silica surface and nano-scale local gold surface were investigated by measuring the resonant frequency change ( increment f) in QCM sensors. The increment fvalues for thep-MIP (MIP on gold pinholes) ands-MIP films (MIP on silica skeleton surface) were obtained with the increment fvalue of -199 +/- 4.9 Hz and -376 +/- 19.1 Hz, respectively, whereas forp-/s-NIP films, the increment fvalues were observed to be -115 +/- 19.2 Hz and -174 +/- 5.8 Hz by the influence of non-specific adsorption on the surface of the films. Additionally, the imprinting factor (IF) appeared to be 1.72 forp-MIP film and 2.15 fors-MIP film, and the limits of quantitation (LOQ) and detection (LOD) were 54.924 and 18.125 nM (p-MIP film) and 38.419 and 12.678 nM (s-MIP film), respectively. Using the Freundlich isotherm model, the binding affinity of the BPA-imprinted films was evaluated. This was measured in an aqueous solution of BPA whose concentration ranged between 45 and 225 nM. It was found that thep-MIP film (m = 0.39) was relatively more heterogeneous than thes-MIP film (m = 0.33), both of which were obtained from the slope of the linear regressions. Finally, the selectivity of the MIP-QCM sensors for BPA detection was determined by measuring the effect of other analogous chemicals, such as bisphenol F (BPF), bisphenol AP (BPAP), and bisphenol B (BPB), in aqueous solutions. The selectivity coefficients (k*) of the two MIP films had similar to 1.9 for thep-MIP and similar to 2.3 for thes-MIP films, respectively. The results reveal that, with respect to signal amplification of the QCM sensors, the s-MIP film has better sensing features and faster detection responses than thep-MIP film. | Yang, Jin Chul; Park, Jinyoung | Kyungpook Natl Univ, Sch Appl Chem Engn, 80 Daehak Ro, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Polymer Sci & Engn, 80 Daehak Ro, Daegu 41566, South Korea | PARK, JUN-YOUNG/P-5981-2015 | 56381794400; 57286293400 | whdns861223@knu.ac.kr;jinpark@knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 9 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.06 | 2025-06-25 | 2 | 1 | colloidal lithography; silica inverse opal; gold pinholes; bisphenol-A; Freundlich isotherm | QUARTZ-CRYSTAL MICROBALANCE; SELF-ASSEMBLED MONOLAYERS; AFFINITY DISTRIBUTIONS; POLYMERIZATION; POLYMERS; ACID | Bisphenol-A; Colloidal lithography; Freundlich isotherm; Gold pinholes; Silica inverse opal | Binding energy; Chemical detection; Free radical reactions; Gold; Grafting (chemical); Musculoskeletal system; Nanotechnology; Natural frequencies; Phenols; Quartz crystal microbalances; Silica; Sols; Freundlich isotherm model; Graft co polymerizations; Limits of quantitations; Nonspecific adsorption; Resonant frequency change; Selectivity coefficient; Signal amplifications; Surface initiated atom transfer radical polymerization (SI ATRP); Atom transfer radical polymerization | English | 2020 | 2020-09 | 10.3390/polym12091892 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | p47phox siRNA-Loaded PLGA Nanoparticles Suppress ROS/Oxidative Stress-Induced Chondrocyte Damage in Osteoarthritis | Osteoarthritis (OA) is the most common joint disorder that has had an increasing prevalence due to the aging of the population. Recent studies have concluded that OA progression is related to oxidative stress and reactive oxygen species (ROS). ROS are produced at low levels in articular chondrocytes, mainly by the nicotinamide adenine dinucleotide phosphate (NADPH) oxidase, and ROS production and oxidative stress have been found to be elevated in patients with OA. The cartilage of OA-affected rat exhibits a significant induction of p47phox, a cytosolic subunit of the NADPH oxidase, similarly to human osteoarthritis cartilage. Therefore, this study tested whether siRNA p47phox that is introduced with poly (D,L-lactic-co-glycolic acid) (PLGA) nanoparticles (p47phox siNPₛ) can alleviate chondrocyte cell death by reducing ROS production. Here, we confirm that p47phox siNPₛ significantly attenuated oxidative stress and decreased cartilage damage in mono-iodoacetate (MIA)-induced OA. In conclusion, these data suggest that p47phox siNPₛ may be of therapeutic value in the treatment of osteoarthritis. | Shin, Hyo Jung; Park, Hyewon; Shin, Nara; Kwon, Hyeok Hee; Yin, Yuhua; Hwang, Jeong-Ah; Kim, Song, I; Kim, Sang Ryong; Kim, Sooil; Joo, Yongbum; Kim, Youngmo; Kim, Jinhyun; Beom, Jaewon; Kim, Dong Woon | Chungnam Natl Univ, Dept Med Sci, Coll Med, Daejeon 35015, South Korea; Chungnam Natl Univ, Brain Res Inst, Dept Anat & Cell Biol, Coll Med, Daejeon 35015, South Korea; Kyungpook Natl Univ, Sch Life Sci, Inst Life Sci & Biotechnol, Brain Sci & Engn Inst,BK21 Plus KNU Creat BioRes, Daegu 41566, South Korea; Chungnam Natl Univ, Dept Orthoped, Coll Med, Daejeon 35015, South Korea; Chungnam Natl Univ, Dept Internal Med, Div Rheumatol, Coll Med, Daejeon 35015, South Korea; Chung Ang Univ, Chung Ang Univ Hosp, Dept Phys Med & Rehabil, Coll Med, Seoul 06973, South Korea | Kim, Dae-Hyun/AAA-4463-2020; kim, dong woon/W-8254-2018; Kim, Dong/W-8254-2018 | 57195753989; 57203117596; 56699607100; 57189320537; 57194577241; 57215200331; 57215210216; 56486163800; 36514817700; 54585255600; 57924758900; 57200646524; 36445178500; 57204150578 | shinhyo1013@gmail.com;phw6304@gmail.com;s0870714@gmail.com;kara00124@gmail.com;yoonokhwa527@gmail.com;ijjanghwang@gmail.com;kthdd12295@gmail.com;srk75@knu.ac.kr;sikim@cnu.ac.kr;longman76@hanmail.net;osdr69@cnuh.co.kr;md228@hanmail.net;powe5@cau.ac.kr;visnu528@cnu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 2 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 2.26 | 2025-06-25 | 44 | 54 | osteoarthritis; monosodium iodoacetate; p47phox; PLGA nanoparticles; reactive oxygen species | NADPH OXIDASE; SUPEROXIDE-PRODUCTION; ARTICULAR-CARTILAGE; REACTIVE NITROGEN; OXYGEN; EXPRESSION; P47(PHOX); INTERLEUKIN-1-BETA; PHOSPHORYLATION; ACTIVATION | Monosodium iodoacetate; Osteoarthritis; p47phox; PLGA nanoparticles; Reactive oxygen species | Cartilage; Cell death; Nanoparticles; Oxidative stress; Articular chondrocytes; Chondrocyte damage; Monosodium iodoacetate; Nicotinamide adenine dinucleotide phosphates; Osteoarthritis; p47phox; PLGA nanoparticles; Poly(d ,l lactic co glycolic acid) (PLGA); Reactive oxygen species | English | 2020 | 2020-02 | 10.3390/polym12020443 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Performance Evaluation of Red Clay Binder with Epoxy Emulsion for Autonomous Rammed Earth Construction | Existing rammed earth construction methods have disadvantages such as increased initial costs for manufacturing the large formwork and increased labor costs owing to the labor-intensive construction techniques involved. To address the limitations of the existing rammed earth construction methods, an autonomous rammed earth construction method was introduced herein. When constructing an autonomous rammed-earth construction method, an alternative means of assuring the performance at the initial age of the binder in terms of materials is needed. In this study, in order to satisfy the performance of the red clay binder, epoxy emulsion was added to analyze the compressive strength, water loosening, shrinkage, rate of mass change, and microstructure in the range of the initial age. As a result of the analysis, the applicability of the epoxy emulsion was confirmed as a new additive for application to an autonomous rammed-earth construction method. | Kim, Jinsung; Choi, Hyeonggil; Yoon, Keun-Byoung; Lee, Dong-Eun | Kyungpook Natl Univ, Sch Architecture Civil Environm & Energy Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Polymer Sci & Engn, Daegu 41566, South Korea | 57219198374; 56430165800; 7401607550; 56605563300 | kjs07406@knu.ac.kr;hgchoi@knu.ac.kr;kbyoon@knu.ac.kr;dolee@knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 9 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.32 | 2025-06-25 | 10 | 10 | autonomous rammed earth construction; soil stabilizer; red clay; epoxy emulsion; mechanical properties; microstructure | SOIL STABILIZATION; DURABILITY; RESIN | Autonomous rammed earth construction; Epoxy emulsion; Mechanical properties; Microstructure; Red clay; Soil stabilizer | Compressive strength; Wages; Formwork; Initial costs; Labor costs; Labor-intensive construction; Mass change; Rammed earth; Red clay; Emulsification | English | 2020 | 2020-09 | 10.3390/polym12092050 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Plasticization Effect of Poly(Lactic Acid) in the Poly(Butylene Adipate-co-Terephthalate) Blown Film for Tear Resistance Improvement | The mechanical properties and tear resistance of an ecofriendly flexible packaging film, i.e., poly(lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) film, were investigated via a blown film extrusion process. The application of PLA and PBAT in product packaging is limited due to the high brittleness, low stiffness, and incompatibility of the materials. In this study, the effects of various plasticizers, such as adipate, adipic acid, glycerol ester, and adipic acid ester, on the plasticization of PLA and fabrication of the PLA/PBAT blown film were comprehensively evaluated. It was determined that the plasticizer containing ether and ester functionalities (i.e., adipic acid ester) improved the flexibility of PLA as well as its compatibility with PBAT. It was found that the addition of the plasticizer effectively promoted chain mobility of the PLA matrix. Moreover, the interfacial adhesion between the plasticized PLA domain and PBAT matrix was enhanced. The results of the present study demonstrated that the plasticized PLA/PBAT blown film prepared utilizing a blown film extrusion process exhibited improved tear resistance, which increased from 4.63 to 8.67 N/mm in machine direction and from 13.19 to 16.16 N/mm in the transverse direction. | Kim, Do Young; Lee, Jae Bin; Lee, Dong Yun; Seo, Kwan Ho | Kyungpook Natl Univ, Dept Polymer Sci & Engn, Daegu 41566, South Korea | ; Lee, Joonseok/AAP-6003-2021; , Do Young Kim/AAB-1459-2021 | 56802861000; 57218880937; 57211001605; 7201838965 | ddyykk9655@gmail.com;moasi333@gmail.com;dongyunlee@knu.ac.kr;khseo@knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 9 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.97 | 2025-06-25 | 35 | 33 | poly(lactic acid); poly (butylene adipate-co-terephthalate); plasticizer; blown film; tear resistance | ACETYL TRIBUTYL CITRATE; RHEOLOGICAL PROPERTIES; MECHANICAL-PROPERTIES; SOLUBILITY PARAMETER; PLA; BLENDS; COMPATIBILIZATION; CRYSTALLIZATION; DEGRADATION; POLYMER | Blown film; Plasticizer; Poly (butylene adipate-co-terephthalate); Poly(lactic acid); Tear resistance | Butenes; Extrusion; Fracture mechanics; Lactic acid; Packaging materials; Plasticizers; Reinforced plastics; Solvents; Blown film extrusion; Flexible packagings; Interfacial adhesions; Machine directions; Plasticization effects; Polies (butylene adipate co terephthalate); Polylactic acids; Product packaging; Esters | English | 2020 | 2020-09 | 10.3390/polym12091904 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Preparation and Electrochemical Properties of Porous Carbon Nanofiber Electrodes Derived from New Precursor Polymer: 6FDA-TFMB | Porous carbon nanofibers (CNFs) with high energy storage performance were fabricated with a single precursor polymer, 6FDA-TFMB, without the use of any pore-generating materials. 6FDA-TFMB was synthesized, electrospun, and thermally treated to produce binder-free CNF electrodes for electrochemical double-layer capacitors (EDLCs). Highly porous CNFs with a surface area of 2213 m(2)g(-1)were prepared by steam-activation. CNFs derived from 6FDA-TFMB showed rectangular cyclic voltammograms with a specific capacitance of 292.3 F g(-1)at 10 mV s(-1). It was also seen that CNFs exhibit a maximum energy density of 13.1 Wh kg(-1)at 0.5 A g(-1)and power density of 1.7 kW kg(-1)at 5 A g(-1), which is significantly higher than those from the common precursor polymer, polyacrylonitrile (PAN). | Jeon, Byeongil; Ha, Taehwa; Lee, Dong Yun; Choi, Myung-Seok; Lee, Seung Woo; Jung, Kyung-Hye | Daegu Catholic Univ, Sch Adv Mat & Chem Engn, Gyongsan 38430, South Korea; Yeungnam Univ, Sch Chem Engn, Gyeonsan 38430, South Korea; Kyungpook Natl Univ, Dept Polymer Sci & Engn, Daegu 41566, South Korea; Konkuk Univ, Div Chem Engn, Seoul 143701, South Korea | Jung, Kyung-Hye/ABE-9687-2020 | 57215791085; 57216657854; 57211001605; 7402093626; 57211365101; 36133275700 | qzpqzp12@gmail.com;lonu7324@gmail.com;dongyunlee@knu.ac.kr;mchoi@konkuk.ac.kr;leesw1212@ynu.ac.kr;khjung@cu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 8 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.58 | 2025-06-25 | 15 | 15 | carbon nanofiber electrodes; EDLCs; 6FDA-TFMB; electrospinning; porous carbon | BINDER-FREE ELECTRODE; ENERGY-STORAGE; PHOTOREACTIVE POLYIMIDE; FLUORINATED POLYIMIDES; GAS-TRANSPORT; PERFORMANCE; PYROLYSIS; FABRICATION; NANOMATERIALS; FILMS | 6FDA-TFMB; Carbon nanofiber electrodes; EDLCs; Electrospinning; Porous carbon | Capacitance; Carbon nanofibers; Energy storage; Polymers; Porous materials; Cyclic voltammograms; Electrochemical double-layer capacitors; Polyacrylonitrile (PAN); Precursor polymers; Single precursors; Specific capacitance; Steam activation; Storage performance; Electrochemical electrodes | English | 2020 | 2020-08 | 10.3390/polym12081851 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | QCM-Based HCl Gas Sensors Using Spin-Coated Aminated Polystyrene Colloids | Hydrogen chloride (HCl) gas is highly toxic to the human body. Therefore, HCl gas detection sensors should be installed at workplaces where trace HCl gas is continuously generated. Even though various polymer-based HCl-gas-sensing films have been developed, simpler and novel sensing platforms should be developed to ensure the cost effectiveness and reusability of the sensing platforms. Therefore, we present a simple strategy to fabricate reusable HCl-gas-sensing platforms using aminated polystyrene (a-PS) colloids and investigate their sensitivity, reusability, and selectivity using a quartz crystal microbalance (QCM). The reusablea-PS(1.0) colloidal sensor with a high degree of amination (DA) exhibited the highest binding capacity (102 mu g/mg) based on the frequency change (Delta f) during the HCl gas adsorption process. Further, its sensitivity and limit of detection (LOD) were 3.88 Hz/ppm and 5.002 ppm, respectively, at a low HCl gas concentration (<10 ppm). In addition, the sensitivity coefficient (k*) of thea-PS(1.0) colloid sensor with respect to HCHO was higher than that in the case of HF because of the lower binding affinity of the former with thea-PS(1.0) colloids. Based on these results, highly sensitive and reproduciblea-PS colloids could be reused as an HCl-gas-sensing platform and used as an HCl sorbent in a gas column filter. | Jin, Young-Jae; Park, Jinyoung | Kyungpook Natl Univ, Sch Appl Chem Engn, 80 Daehak Ro, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Polymer Sci & Engn, 80 Daehak Ro, Daegu 41566, South Korea | PARK, JUN-YOUNG/P-5981-2015 | 55307815700; 57286293400 | lastlast7@naver.com;jinpark@knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 7 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.26 | 2025-06-25 | 7 | 6 | PS colloidal bead; amination; HCl gas; QCM; sensitivity | POLY(N-ISOPROPYLACRYLAMIDE) NANOPARTICLES; DERIVATIVES; FABRICATION; FILM | Amination; HCl gas; PS colloidal bead; QCM; Sensitivity | Amination; Amines; Binding energy; Chemical detection; Chemical sensors; Colloids; Cost effectiveness; Gas adsorption; Gas detectors; Gases; Polymer films; Polystyrenes; Quartz crystal microbalances; Reusability; Adsorption process; Binding affinities; Binding capacities; Frequency changes; Hydrogen chloride; Limit of detection; Polystyrene colloid; Sensitivity coefficient; Chlorine compounds | English | 2020 | 2020-07 | 10.3390/polym12071591 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Surface Characteristics of Polymers with Different Absorbance after UV Picosecond Pulsed Laser Processing Using Various Repetition Rates | We experimented with two polymer materials with different ultraviolet (UV) wavelength absorption characteristics, which are commonly used in flexible devices, by applying an ultrashort-pulsed laser of a 355-nm UV wavelength for 10 ps. The laser parameters studied were pulse repetition rate, laser irradiation method, and laser power condition. Previous studies using polyethylene terephthalate (PET), which does not exhibit linear absorption at a UV wavelength, have focused on processing trends resulting in minimal collateral damage around the laser-induced ablation. However, our results showed a trend of accumulating such damage irrespective of the laser parameters. Meanwhile, polyimide (PI) exhibited a completely different behavior depending on the laser parameters. At low pulse repetition rates, minimal collateral damage was observed, whereas at high repetition rates, the morphology varied considerably. The electrical characteristics of the laser-processed materials were found to be correlated with the variations in morphology. In the case of PI, such variations in electrical resistance and morphology indicated that the material was carbonized. The findings of this study are expected to provide a useful reference when selecting parameters for the laser processing of similar polymer materials. | Ham, Seung Sik; Lee, Ho | Kyungpook Natl Univ, Inst Nano Photon Applicat, Daegu 41566, South Korea; Kyungpook Natl Univ, Sch Mech Engn, Daegu 41566, South Korea; Kyungpook Natl Univ, Laser Applicat Ctr, Daegu 41061, South Korea | 57205454263; 26660670700 | ssh13@knu.ac.kr;holee@knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 9 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.13 | 2025-06-25 | 7 | 9 | polyimide; polyethylene terephthalate; picosecond laser; heat accumulation effect; carbonization phenomenon | POLYETHYLENE TEREPHTHALATE PET; HEAT ACCUMULATION; WAVE-GUIDES; ABLATION; POLYIMIDE; FABRICATION; MICROCHANNELS; CARBONIZATION; PERFORMANCE; ABSORPTION | Carbonization phenomenon; Heat accumulation effect; Picosecond laser; Polyethylene terephthalate; Polyimide | Ablation; Morphology; Picosecond lasers; Plastic bottles; Polymers; Pulse repetition rate; Pulsed lasers; Ultraviolet lasers; Absorption characteristics; Electrical characteristic; Electrical resistances; Laser-induced ablation; Polyethylene terephthalates (PET); Surface characteristics; Ultrashort-pulsed laser; Ultraviolet wavelength; Laser materials processing | English | 2020 | 2020-09 | 10.3390/polym12092018 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Synthesis and Properties of Thiophene and Aniline Copolymer Using Atmospheric Pressure Plasma Jets Copolymerization Technique | This paper investigates the properties of thiophene and aniline copolymer (TAC) films deposited by using atmospheric pressure plasma jets copolymerization technique relative to various blending ratios of aniline and thiophene monomer for synthesizing the donor-acceptor conjugated copolymers. Field emission scanning electron microscopy (FE-SEM) and atomic force microscopy are utilized to measure the surface morphology, roughness and film thickness of TAC films. Structural and chemical properties of TAC films are investigated by Fourier transforms-infrared spectroscopy (FT-IR), time of flight secondary ion mass spectrometry, and X-ray photoelectron spectroscopy. FE-SEM images show that the film thickness and nanoparticles size of the TAC films increase with an addition thiophene monomer in the aniline monomer. FE-SEM, FT-IR results show that TAC films are successfully synthesized on glass substrates in all cases. The iodine doped TAC film on the Si substrate with interdigitated electrodes shows the lowest electrical resistance at blending condition of thiophene of 25%. | Jang, Hyo Jun; Park, Choon-Sang; Jung, Eun Young; Bae, Gyu Tae; Shin, Bhum Jae; Tae, Heung-Sik | Kyungpook Natl Univ, Coll IT Engn, Sch Elect & Elect Engn, Daegu 41566, South Korea; Kansas State Univ, Dept Elect & Comp Engn, Coll Engn, Manhattan, KS 66506 USA; Sejong Univ, Dept Elect Engn, Seoul 05006, South Korea; Kyungpook Natl Univ, Sch Elect Engn, Coll IT Engn, Daegu 41566, South Korea | Shin, BhumJae/AEV-2572-2022 | 57207956623; 16025295400; 57203199724; 57202369078; 7103027782; 7006298844 | bs00201@knu.ac.kr;purplepcs@ksu.edu;eyjung@knu.ac.kr;doctor047@knu.ac.kr;hahusbi@sejong.ac.kr;hstae@ee.knu.ac.kr; | POLYMERS | POLYMERS-BASEL | 2073-4360 | 12 | 10 | SCIE | POLYMER SCIENCE | 2020 | 4.329 | 19.4 | 0.58 | 2025-06-25 | 19 | 19 | thiophene and aniline copolymer (TAC); donor– acceptor (D– A) copolymer; conjugated copolymers (CCPs); aniline; thiophene; atmospheric pressure plasma (APP); atmospheric pressure plasma jet (APPJ) | X-RAY PHOTOELECTRON; CONJUGATED POLYMERS; POLYTHIOPHENE; POLYMERIZATION; SURFACE; FILMS | Aniline; Atmospheric pressure plasma (APP); Atmospheric pressure plasma jet (APPJ); Conjugated copolymers (CCPs); Donor–acceptor (D–A) copolymer; Thiophene; Thiophene and aniline copolymer (TAC) | Aniline; Atmospheric chemistry; Atmospheric pressure; Atomic force microscopy; Copolymerization; Enamels; Field emission microscopes; Film thickness; Fourier transforms; Infrared spectroscopy; Monomers; Morphology; Optical films; Plasma jets; Scanning electron microscopy; Secondary ion mass spectrometry; Substrates; Surface morphology; X ray photoelectron spectroscopy; Atmospheric pressure plasma jets; Conjugated copolymers; Electrical resistances; Field emission scanning electron microscopy; Fourier transforms infrared spectroscopies; Inter-digitated electrodes; Nanoparticles sizes; Time of flight secondary ion mass spectrometry; Thiophene | English | 2020 | 2020-10 | 10.3390/polym12102225 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | Meeting Abstract | Current trend in the Helicobacter pylori eradication rates of first-line sequential and concomitant therapies in Korea: A nationwide multicenter retrospective study over the 10 years | Kim, B.; Lee, B.; Kim, J.; Kim, J.; Chung, J.; Jeon, S.; Kim, J.; Lee, J.; Kim, J.; Kim, N.; Lee, J.; Seo, S.; Park, S.; Kim, S.; Joo, M.; Song, H.; Kim, K.; Bang, C.; Kim, H. | Catholic Univ Korea, Incheon, South Korea; Pusan Natl Univ, Busan, South Korea; Yonsei Univ, Seoul, South Korea; Catholic Univ Korea, Seoul, South Korea; Gachon Univ, Incheon, South Korea; Kyungpook Natl Univ, Daegu, South Korea; Univ Ulsan, Seoul, South Korea; Inje Univ, Busan, South Korea; Seoul Natl Univ, Seoul, South Korea; Keimyung Univ, Daegu, South Korea; Chonbuk Natl Univ, Jeonju, South Korea; Chonnam Natl Univ, Gwangju, South Korea; Kosin Univ, Busan, South Korea; Korea Univ, Seoul, South Korea; Jeju Natl Univ, Jeju, South Korea; Chungbuk Natl Univ, Cheongju, South Korea; Hallym Univ, Chunchon, South Korea; Gyeongsang Natl Univ, Jinju, South Korea | Bang, Chang SEOK/I-9689-2019 | HELICOBACTER | HELICOBACTER | 1083-4389 | 1523-5378 | 25 | SCIE | GASTROENTEROLOGY & HEPATOLOGY;MICROBIOLOGY | 2020 | 5.753 | 19.5 | 0 | English | 2020 | 2020-09 | 바로가기 | 바로가기 | ||||||||||||||||
| ○ | Article | Piezoelectric polymer energy harvesting system fluctuating in a high speed wind-flow around a running electric vehicle | The battery of electric vehicles (EVs) is the only power source for the operation of an electric motor, heating and cooling devices, and many other auxiliaries. Therefore, the EV may be vulnerable to electricity shortage during running. It may be good if turbulent flow or vortex induced vibrations occurring around a vehicle body can be transformed into electricity by a piezoelectric energy harvester. In this study, an electric energy harvester has been developed in the forms of thin piezoelectric polymer beams and plates in order to supply auxiliary electric power for EV. The piezoelectric thin beam and plate can be installed as a grill structure or on the surface of a car while two edges of the harvesting structures are fixed and they fluctuate due to the various high-speed airflow-induced vibrations during running of the vehicle. The vortex shedding pressures around the piezoelectric systems and a whole car are computed on the basis of computational fluid dynamic transient analyses with FLUENT. The displacements and resulting voltages of energy harvesting structures are computed by using ANSYS piezoelectric finite element analyses which use the input loadings of the transient vortex shedding pressures obtained from CFD. As results of analyses, a reasonable amount of electric power applicable for the charge of an EV battery can be harvested from the passing wind around a vehicle. The 0.12 mm-thin PVDF beam-type (260 mm × 10 mm) and the plate-type (75 mm × 30 mm) generated the maximum 61.43 volt and 21.5 mW power and 4.77 volt and 0.191 mW at the air-speed of 90 km h-1 in the wind tunnel tests, respectively. The two types of harvesting systems installed on a car were also tested while driving the real car. The test results showed the good agreements with numerical predictions and wind tunnel test results. © 2020 IOP Publishing Ltd. | Kim, Cheol; Park, Chang-Min; Yoon, Jin-Young; Park, Sang-Young | Department of Mechanical Engineering, Kyungpook National University, 80 Daehak Ro, Daegu, 702-701, South Korea; Department of Mechanical Engineering, Kyungpook National University, 80 Daehak Ro, Daegu, 702-701, South Korea; RandD Division, Hyundai Motor Company, 150 Hyundaiyeonguso-Ro, Namyang-Eup, Hwaseong-Si, Gyeonggi-Do, 18280, South Korea; Hyundai Ngv, 314 dong, 1 Gwanak-ro, Seoul, 08826, South Korea | 55508786300; 57203982007; 57221047864; 57221052067 | kimchul@knu.ac.kr; | Smart Materials and Structures | SMART MATER STRUCT | 0964-1726 | 1361-665X | 30 | 1 | SCIE | INSTRUMENTS & INSTRUMENTATION;MATERIALS SCIENCE, MULTIDISCIPLINARY | 2020 | 3.585 | 19.5 | 0.66 | 2025-06-25 | 15 | energy harvesting; flutter; high speed flow; piezoelectric polymer; real car test | Automobile testing; Computational fluid dynamics; Electric automobiles; Electric load shedding; Energy harvesting; Piezoelectricity; Plates (structural components); Secondary batteries; Transient analysis; Vortex flow; Vortex shedding; Wind stress; Wind tunnels; Electric Vehicles (EVs); Heating and cooling; Induced vibrations; Numerical predictions; Piezoelectric energy harvesters; Piezoelectric polymers; Piezoelectric system; Vortex induced vibration; Vibrations (mechanical) | English | Final | 2020 | 10.1088/1361-665x/abb98a | 바로가기 | 바로가기 | 바로가기 | |||||||
| ○ | ○ | Article | Edge stabilization in the homology of graph braid groups | We introduce a novel type of stabilization map on the configuration spaces of a graph which increases the number of particles occupying an edge. There is an induced action on homology by the polynomial ring generated by the set of edges, and we show that this homology module is finitely generated. An analogue of classical homological and representation stability for manifolds, this result implies eventual polynomial growth of Betti numbers. We calculate the exact degree of this polynomial, in particular verifying an upper bound conjectured by Ramos. Because the action arises from a family of continuous maps, it lifts to an action at the level of singular chains which contains strictly more information than the homology-level action. We show that the resulting differential graded module is almost never formal over the ring of edges. | An, Byung Hee; Drummond-Cole, Gabriel C.; Knudsen, Ben | Kyungpook Natl Univ, Teachers Coll, Dept Math Educ, Daegu, South Korea; Inst for Basic Sci Korea, Ctr Geometry & Phys, Pohang, South Korea; Harvard Univ, Dept Math, Cambridge, MA 02138 USA | An, Byung/O-8592-2014 | 36599927400; 55260653700; 57195227248 | anbyhee@knu.ac.kr;gabriel.c.drummond.cole@gmail.com;ben.e.knudsen@gmail.com; | GEOMETRY & TOPOLOGY | GEOM TOPOL | 1465-3060 | 1364-0380 | 24 | 1 | SCIE | MATHEMATICS | 2020 | 1.563 | 19.6 | 1.56 | 2025-06-25 | 10 | 11 | CONFIGURATION-SPACES; QUANTUM STATISTICS; STABILITY | English | 2020 | 2020 | 10.2140/gt.2020.24.421 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||||
| ○ | ○ | Article; Proceedings Paper | Learning Proxemics for Personalized Human-Robot Social Interaction | Each person has their personal area which they do not want to share with others during social interactions. The size of this area usually depends on various factors such as their culture, personal traits, and acquaintanceship. The same applies to the case of human-robot interaction, especially when the robot is required to exhibit a certain level of social competence. Here, we propose a new robot navigation strategy to socially interact with people reflecting upon the social relationship between the robot and each person. To this end, we need a clear definition of interaction areas: (1) quality interaction area where people can be engaged in high-quality interactions with robots, and (2) private area not to be interfered with by the robot speech or action. A technical challenge in enhancing social human-robot interactions is how to enable robots to delineate the boundary of the two areas of each person. Specifically, the social force model (SFM) is designed by a fuzzy inference system, where the membership functions are optimized to give the robot the ability to navigate autonomously in the quality interaction area using a reinforcement learning algorithm. Finally, the proposed model was verified through simulations and experiments with a real robot that can generate a suitable SFM of each person, allowing the robot to maintain the quality of interaction with each person while keeping their private personal distance. | Patompak, Pakpoom; Jeong, Sungmoon; Nilkhamhang, Itthisek; Chong, Nak Young | Japan Adv Inst Sci & Technol, Sch Informat Sci, 1-1 Asahidai, Nomi, Ishikawa, Japan; Sirindhorn Int Inst Technol, Informat Comp & Commun Technol, Phahonyothin Rd, Amphoe Khlong Luang, Pathum Thani, Thailand; Kyungpook Natl Univ Hosp, Biomed Res Inst, Ctr Artificial Intelligence Med, Daegu, South Korea; Kyungpook Natl Univ, Sch Med, Daegu, South Korea | 36185797700; 23100090400; 12795795800; 7007012034 | p.patompak@gmail.com;jeongsm00@gmail.com;itthisek@siit.tu.ac.th;nakyoung@jaist.ac.jp; | INTERNATIONAL JOURNAL OF SOCIAL ROBOTICS | INT J SOC ROBOT | 1875-4791 | 1875-4805 | 12 | 1 | SCIE | ROBOTICS | 2020 | 5.126 | 19.6 | 2.4 | 2025-06-25 | 41 | 45 | Proxemics; Social interaction; Social force model; Fuzzy inference system; Reinforcement learning | MOTION | Fuzzy inference system; Proxemics; Reinforcement learning; Social force model; Social interaction | Agricultural robots; Fuzzy inference; Fuzzy systems; Inference engines; Learning algorithms; Learning systems; Membership functions; Reinforcement learning; Fuzzy inference systems; Proxemics; Quality of interaction; Robot interactions; Social force models; Social interactions; Social relationships; Technical challenges; Social robots | English | 2020 | 2020-01 | 10.1007/s12369-019-00560-9 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Letter | Platelet-derived growth factor-AA-inducible epiregulin promotes elongation of human hair shafts by enhancing proliferation and differentiation of follicular keratinocytes | Jeong, Hyun Sik; Kwack, Mi Hee; Joo, Hyun Woo; Kim, Moon Kyu; Kim, Jung Chul; Sung, Young Kwan | Kyungpook Natl Univ, Sch Med, Dept Immunol, 680 Gukchaebosang Ro, Daegu 41944, South Korea; Kyungpook Natl Univ Hosp, Hair Transplantat Ctr, Daegu, South Korea | 57193602376; 6507685557; 55989818400; 57199748390; 57207436677; 55663365300 | ysung@knu.ac.kr; | JOURNAL OF DERMATOLOGICAL SCIENCE | J DERMATOL SCI | 0923-1811 | 1873-569X | 97 | 2 | SCIE | DERMATOLOGY | 2020 | 4.563 | 19.6 | 0.2 | 2025-06-25 | 5 | 5 | RECEPTOR; PDGF; CELLS | Animals; Biopsy; Cell Proliferation; Cells, Cultured; Epiregulin; Female; Gene Expression Profiling; Gene Knockdown Techniques; Hair Follicle; Humans; Injections, Subcutaneous; Male; Mice; Oligonucleotide Array Sequence Analysis; Platelet-Derived Growth Factor; Primary Cell Culture; Recombinant Proteins; RNA, Small Interfering; Scalp; Up-Regulation; epiregulin; platelet derived growth factor AA; platelet derived growth factor alpha receptor; epiregulin; EREG protein, human; platelet derived growth factor; platelet-derived growth factor A; recombinant protein; small interfering RNA; apoptosis; cell differentiation; cell isolation; cell proliferation; controlled study; down regulation; drug mechanism; gene induction; hair follicle cell; hair growth; human; human cell; human cell culture; immunocytochemistry; immunohistochemistry; keratinocyte; Letter; mouse; nonhuman; priority journal; protein expression; protein function; real time polymerase chain reaction; upregulation; animal; biopsy; cell culture; cell proliferation; cytology; DNA microarray; female; gene expression profiling; gene knockdown; genetics; growth, development and aging; hair follicle; male; metabolism; primary cell culture; scalp; subcutaneous drug administration | English | 2020 | 2020-02 | 10.1016/j.jdermsci.2020.01.003 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||||
| ○ | ○ | Article | SecureLinQ: Joint Precoding and Scheduling for Secure Device-to-Device Networks | We propose joint design on precoding and scheduling for secure device-to-device networks, wherein transmitters (TXs) send confidential messages to associated receivers (RXs) while the eavesdroppers seek to wiretap the messages. To this end, we solve a network sum secrecy spectral efficiency (SE) maximization problem. The main challenges are: i) the problem is non-convex and (ii) the secrecy SE is not smooth with the presence of multiple eavesdroppers. To address the difficulties, we first approximate the secrecy SE by exploiting a smooth maximum function and transform the original problem into a tractable non-convex form. Subsequently, we propose a low-complexity algorithm to find a sub-optimal solution, referred as SecureLinQ. Simulation results validate the performance of SecureLinQ. | Choi, Jinseok; Park, Jeonghun | Wireless R&D Qualcomm Inc, San Diego, CA 92121 USA; Kyungpook Natl Univ, Sch Elect Engn, Coll IT Engn, Daegu 41566, South Korea | Choi, Jinseok/AAL-6383-2020 | 57190581671; 57853652900 | jinseokchoi89@utexas.edu;jeonghun.park@knu.ac.kr; | IEEE WIRELESS COMMUNICATIONS LETTERS | IEEE WIREL COMMUN LE | 2162-2337 | 2162-2345 | 9 | 12 | SCIE | COMPUTER SCIENCE, INFORMATION SYSTEMS;ENGINEERING, ELECTRICAL & ELECTRONIC;TELECOMMUNICATIONS | 2020 | 4.348 | 19.6 | 0.57 | 2025-06-25 | 8 | 9 | Physical layer security; device-to-device communications; optimization; multiple-antenna systems | PHYSICAL LAYER SECURITY; MIMO SYSTEMS; OPTIMIZATION; SECRECY; DESIGN | device-to-device communications; multiple-antenna systems; optimization; Physical layer security | Computational complexity; Confidential message; Joint designs; Joint precoding; Low complexity algorithm; Maximization problem; Secure devices; Spectral efficiencies; Suboptimal solution; Scheduling | English | 2020 | 2020-12 | 10.1109/lwc.2020.3012891 | 바로가기 | 바로가기 | 바로가기 | 바로가기 |
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