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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 | Molecularly imprinted polymer-based extended-gate field-effect transistor chemosensors for selective determination of antiepileptic drug | Ultrathin molecularly imprinted polymer (MIP) films were deposited on the surfaces of ZnO nanorods (ZNRs) and nanosheets (ZNSs) by electropolymerization to afford extended-gate field-effect transistor sensors for detecting phenytoin (PHT) in plasma. Molecular imprinting efficiency was optimized by controlling the contents of functional monomers and the template in the precursor solution. PHT sensing was performed in plasma solutions with various concentrations by monitoring the drain current as a function of drain voltage under an applied gate voltage of 1.5 V. The reliability and reproducibility of the fabricated sensors were evaluated through a solution treatment process for complete PHT removal and PHT adsorption-removal cycling, while selectivity was examined by analyzing responses to chemicals with structures analogous to that of PHT. Compared with the ZNS/extracted-MIP sensor and sensors with non-imprinted polymer (NIP) films, the ZNR/extracted-MIP sensor showed superior responses to PHT-containing plasma due to selective PHT adsorption, achieving an imprinting factor of 4.23, detection limit of 12.9 ng/mL, quantitation limit of 53.0 ng/mL, and selectivity coefficients of 3-4 (against tramadol) and similar to 5 (against diphenhydramine). Therefore, we believe that the MIP-based ZNR sensing platform is promising for the practical detection of PHT and other drugs and evaluation of their proper dosages. | Yang, Jin Chul; Shin, Nari; Lim, Seok Jin; Cho, Chae Hwan; Hazarika, Deepshikha; Park, Jong Pil; Park, Jinyoung | Kyungpook Natl Univ, Dept Polymer Sci & Engn, 80 Daehak Ro, Daegu 41566, South Korea; Chung Ang Univ, Dept Food Sci & Technol, Anseong 17546, South Korea; Chung Ang Univ, GreenTech Based Food Safety Res Grp BK21 Four, Anseong 17546, South Korea | ; PARK, JUN-YOUNG/P-5981-2015; Park, Tae/G-1509-2013 | 56381794400; 59172870800; 58163180700; 57195217683; 57739151500; 9270334400; 57286293400 | jppark@cau.ac.kr;jinpark@knu.ac.kr; | MICROCHIMICA ACTA | MICROCHIM ACTA | 0026-3672 | 1436-5073 | 191 | 7 | SCIE | CHEMISTRY, ANALYTICAL | 2024 | 5.3 | 18.5 | 0.26 | 2025-05-07 | 2 | 2 | Antiepileptic drug; Molecular imprinting; Extended-gate field-effect transistor; Drain current; Zinc oxide pattern; Imprinting factor | SOLID-PHASE EXTRACTION; ISOTHERM ANALYSIS; ZNO NANOSHEETS; MIP FILM; PHENYTOIN; PLASMA; SAMPLES; URINE; FET | Antiepileptic drug; Drain current; Extended-gate field-effect transistor; Imprinting factor; Molecular imprinting; Zinc oxide pattern | Adsorption; Anticonvulsants; Humans; Limit of Detection; Molecular Imprinting; Molecularly Imprinted Polymers; Nanotubes; Phenytoin; Polymers; Reproducibility of Results; Transistors, Electronic; Zinc Oxide; Antibiotics; Biochemistry; Biosynthesis; Chemosensor; Electropolymerization; Field effect transistors; II-VI semiconductors; Molecular modeling; Nanorods; Polymer films; Semiconducting films; anticonvulsive agent; molecularly imprinted polymer; nanotube; phenytoin; polymer; zinc oxide; Antiepileptics drugs; Extended-gate field-effect transistors; Imprinting factor; Molecular imprinting; Molecularly Imprinted Polymer; Molecularly imprinted polymer-sensor; Phenytoin; Polymer based; Zinc oxide pattern; ZnO nanorod; adsorption; blood; chemistry; human; limit of detection; molecular imprinting; reproducibility; transistor; Zinc oxide | English | 2024 | 2024-07 | 10.1007/s00604-024-06487-x | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Ordered magnetic fields around the 3C 84 central black hole | Context. 3C 84 is a nearby radio source with a complex total intensity structure, showing linear polarisation and spectral patterns. A detailed investigation of the central engine region necessitates the use of very-long-baseline interferometry (VLBI) above the hitherto available maximum frequency of 86 GHz. Aims. Using ultrahigh resolution VLBI observations at the currently highest available frequency of 228 GHz, we aim to perform a direct detection of compact structures and understand the physical conditions in the compact region of 3C 84. Methods. We used Event Horizon Telescope (EHT) 228 GHz observations and, given the limited (u; v)-coverage, applied geometric model fitting to the data. Furthermore, we employed quasi-simultaneously observed, ancillary multi-frequency VLBI data for the source in order to carry out a comprehensive analysis of the core structure. Results. We report the detection of a highly ordered, strong magnetic field around the central, supermassive black hole of 3C 84. The brightness temperature analysis suggests that the system is in equipartition. We also determined a turnover frequency of gamma(m) = (113 +/- 4) GHz, a corresponding synchrotron self-absorbed magnetic field of B-SSA = (2.9 +/- 1.6) G, and an equipartition magnetic field of B-eq = (5.2 +/- 0.6) G. Three components are resolved with the highest fractional polarisation detected for this object (m(net) = (17.0 +/- 3.9)%). The positions of the components are compatible with those seen in low-frequency VLBI observations since 2017-2018. We report a steeply negative slope of the spectrum at 228 GHz. We used these findings to test existing models of jet formation, propagation, and Faraday rotation in 3C 84. Conclusions. The findings of our investigation into di fferent flow geometries and black hole spins support an advection-dominated accretion flow in a magnetically arrested state around a rapidly rotating supermassive black hole as a model of the jet-launching system in the core of 3C 84. However, systematic uncertainties due to the limited (u, v)-coverage, however, cannot be ignored. Our upcoming work using new EHT data, which o ffer full imaging capabilities, will shed more light on the compact region of 3C 84. | Paraschos, G. F.; Kim, J-Y; Wielgus, M.; Roeder, J.; Krichbaum, T. P.; Ros, E.; Agudo, I; Myserlis, I; Moscibrodzka, M.; Traianou, E.; Zensus, J. A.; Blackburn, L.; Chan, C-K; Issaoun, S.; Janssen, M.; Johnson, M. D.; Fish, V. L.; Akiyama, K.; Alberdi, A.; Alef, W.; Algaba, J. C.; Anantua, R.; Asada, K.; Azulay, R.; Bach, U.; Baczko, A-K; Ball, D.; Balokovic, M.; Barrett, J.; Baubock, M.; Benson, B. A.; Bintley, D.; Blundell, R.; Bouman, K. L.; Bower, G. C.; Boyce, H.; Bremer, M.; Brinkerink, C. D.; Brissenden, R.; Britzen, S.; Broderick, A. E.; Broguiere, D.; Bronzwaer, T.; Bustamante, S.; Byun, D-Y; Carlstrom, J. E.; Ceccobello, C.; Chael, A.; Chang, D. O.; Chatterjee, K.; Chatterjee, S.; Chen, M. T.; Chen, Y.; Cheng, X.; Cho, I; Christian, P.; Conroy, N. S.; Conway, J. E.; Cordes, J. M.; Crawford, T. M.; Crew, G. B.; Cruz-Osorio, A.; Cui, Y.; Dahale, R.; Davelaar, J.; De Laurentis, M.; Deane, R.; Dempsey, J.; Desvignes, G.; Dexter, J.; Dhruv, V; Doeleman, S. S.; Dougal, S.; Dzib, S. A.; Eatough, R. P.; Emami, R.; Falcke, H.; Farah, J.; Fomalont, E.; Ford, H. A.; Foschi, M.; Fraga-Encinas, R.; Freeman, W. T.; Friberg, P.; Fromm, C. M.; Fuentes, A.; Galison, P.; Gammie, C. F.; Garcia, R.; Gentaz, O.; Georgiev, B.; Goddi, C.; Gold, R.; Gomez-Ruiz, A., I; Gomez, J. L.; Gu, M.; Gurwell, M.; Hada, K.; Haggard, D.; Haworth, K.; Hecht, M. H.; Hesper, R.; Heumann, D.; Ho, L. C.; Ho, P.; Honma, M.; Huang, C. L.; Huang, L.; Hughes, D. H.; Ikeda, S.; Impellizzeri, C. M., V; Inoue, M.; James, D. J.; Jannuzi, B. T.; Jeter, B.; Jaing, W.; Jimenez-Rosales, A.; Jorstad, S.; Joshi, A., V; Jung, T.; Karami, M.; Karuppusamy, R.; Kawashima, T.; Keating, G. K.; Kettenis, M.; Kim, D-J; Kim, J.; Kim, J.; Kino, M.; Koay, J. Y.; Kocherlakota, P.; Kofuji, Y.; Koch, P. M.; Koyama, S.; Kramer, C.; Kramer, J. A.; Kramer, M.; Kuo, C-Y; La Bella, N.; Lauer, T. R.; Lee, D.; Lee, S-S; Leung, P. K.; Levis, A.; Li, Z.; Lico, R.; Lindahl, G.; Lindqvist, M.; Lisakov, M.; Liu, J.; Liu, K.; Liuzzo, E.; Lo, W-P; Lobanov, A. P.; Loinard, L.; Lonsdale, C. J.; Lowitz, A. E.; Lu, R-S; MacDonald, N. R.; Mao, J.; Marchili, N.; Markoff, S.; Marrone, D. P.; Marscher, A. P.; Marti-Vidal, I; Matsushita, S.; Matthews, L. D.; Medeiros, L.; Menten, K. M.; Michalik, D.; Mizuno, I; Mizuno, Y.; Moran, J. M.; Moriyama, K.; Mulaudzi, W.; Mueller, C.; Mueller, H.; Mus, A.; Musoke, G.; Nadolski, A.; Nagai, H.; Nagar, N. M.; Nakamura, M.; Narayanan, G.; Natarajan, I; Nathanail, A.; Navarro Fuentes, S.; Neilsen, J.; Neri, R.; Ni, C.; Noutsos, A.; Nowak, M. A.; Oh, J.; Okino, H.; Olivares, H.; Ortiz-Leon, G. N.; Oyama, T.; Ozel, F.; Palumbo, D. C. M.; Park, J.; Parsons, H.; Patel, N.; Pen, U-L; Pietu, V; Plambeck, R.; PopStefanija, A.; Porth, O.; Potzl, F. M.; Prather, B.; Preciado-Lopez, J. A.; Psaltis, D.; Pu, H-Y; Ramakrishnan, V; Rao, R.; Rawlings, M. G.; Raymond, A. W.; Rezzolla, L.; Ricarte, A.; Ripperda, B.; Roelofs, F.; Rogers, A.; Romero-Canizales, C.; Roshanineshat, A.; Rottmann, H.; Roy, A. L.; Ruiz, I; Ruszczyk, C.; Rygl, K. L. J.; Sanchez, S.; Sanchez-Arguelles, D.; Sanchez-Portal, M.; Sasada, M.; Satapathy, K.; Savolainen, T.; Schloerb, F. P.; Schonfeld, J.; Schuster, K.; Shao, L.; Shen, Z.; Small, D.; Sohn, B. W.; SooHoo, J.; Salas, L. D. Sosapanta; Souccar, K.; Sun, H.; Tazaki, F.; Tetarenko, A. J.; Tiede, P.; Tilanus, R. P. J.; Titus, M.; Torne, P.; Toscano, T.; Trent, T.; Trippe, S.; Turk, M.; van Bemmel, I; van Langevelde, H. J.; van Rossum, D. R.; Vos, J.; Wagner, J.; Ward-Thompson, D.; Wardle, J.; Washington, J. E.; Weintroub, J.; Wharton, R.; Wiik, K.; Witzel, G.; Wondrak, M. F.; Wong, G. N.; Wu, Q.; Yadlapalli, N.; Yamaguchi, P.; Yfantis, A.; Yoon, D.; Young, A.; Young, K.; Younsi, Z.; Yu, W.; Yuan, F.; Yuan, Y-F; Zhang, S.; Zhao, G. 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Brandeis Univ, Phys Dept, 415 South St, Waltham, MA 02453 USA; Univ Turku, Dept Phys & Astron, Tuorla Observ, Turku, Finland; Radboud Univ Nijmegen, Nijmegen, Netherlands; Inst Adv Study, Sch Nat Sci, 1 Einstein Dr, Princeton, NJ 08540 USA; Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China; Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England; Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China; Univ Sci & Technol China, Astron Dept, Hefei 230026, Peoples R China; Michigan State Univ, Dept Phys & Astron, 567 Wilson Rd, E Lansing, MI 48824 USA | ; Baczko, Anne-Kathrin/AAW-2724-2020; Goddi, Ciriaco/AAN-4033-2021; Azulay, Rebecca/U-2560-2017; Zamorano, Jose/ABU-6635-2022; Turk, Matthew/GXV-9589-2022; Kramer, Michael/KLY-3270-2024; Cho, Ilje/LSL-5339-2024; Mellon, Michael/C-3456-2016; Gold, Roman/AAX-5851-2021; WU, Qinwen/NHQ-3548-2025; Ruiz, Isaac/T-7713-2018; Ceccobello, Chiara/AAD-4283-2022; Kim, Jae-Young/IUO-6466-2023; Lico, Rocco/L-8308-2019; Cheng, Xiaopeng/ABX-5356-2022; Moriyama, Kotaro/NGQ-8643-2025; Torne, Pablo/MIP-4319-2025; Cruz Osorio, Alejandro/GQQ-8823-2022; Barrett, John/K-8867-2014; Koch, Patrick/AAV-3373-2021; Wagner, Jan/LTZ-8501-2024; Agudo, Ivan/G-1701-2015; Ros, Eduardo/B-1014-2015; Bower, Geoffrey/ABC-8386-2020; Cui, Yuzhu/MBG-4427-2025; Ikeda, Shiro/E-1736-2016; nagar, neil/AAG-4543-2020; Sasada, Mahito/ABD-5766-2020; Lobanov, Andrei/G-5891-2014; Mueller, Hendrik/JXL-4021-2024; Bach, Udo/F-3880-2012; Matsushita, Satoki/ABD-5562-2020; Impellizzeri, Violette/JQW-3813-2023; Yuan, Yufeng/KWU-9483-2024; Toscano Domingo, Teresa/ITV-2430-2023; Myserlis, Ioannis/MCY-5944-2025; Algaba, Juan Carlos/AAB-4526-2022; Lisakov, Mikhail/JAX-3277-2023; Rao, Ramprasad/L-2115-2017; Sanchez, David/KIH-3142-2024; Wielgus, Maciek/JEF-6647-2023; Falcke, Heino/H-5262-2012; Rezzolla, Luciano/JPK-1036-2023; Olivares, Hector/KWU-1646-2024; Jorstad, Svetlana/AAM-3279-2021; Kim, Junhan/LTZ-1683-2024; Pen, Ue-Li/AAX-6083-2021; Loinard, Laurent/MCX-8116-2025; Zhang, Shuo/IUO-8909-2023; 浅田圭一, Keiichi/ABC-2456-2020; Shao, Lijing/GRO-6046-2022; 韓之強, Chih/AAZ-8498-2020; Wong, George/AAL-1016-2021; Olivares Sanchez, Hector Raul/KWU-1646-2024; Fuentes, Antonio/R-3900-2019; huang, lei/GQP-8739-2022; Koay, Jun/E-4952-2015; Chatterjee, Shami/AAE-8374-2022; Lisakov, Mikhail/M-6034-2013 | 57224966143; 57217417856; 52164611300; 57673612500; 7004015011; 7102531000; 55385524500; 55917789200; 57203337908; 57204824800; 7004929291; 35271380400; 36984595000; 57190760991; 57213908458; 57213466094; 6701500929; 55669706400; 7004247728; 6603338811; 25640916000; 34876318600; 7102181737; 55974067100; 8356678200; 57191172071; 57191854254; 55441118000; 57221919962; 55279774300; 43360904200; 6508166420; 7005148075; 36627851000; 7006319230; 56514949800; 55348923700; 55789158500; 6701852507; 6602806448; 7005699469; 12805385500; 55845982300; 57208321725; 57203026080; 35276941600; 50660994600; 55324722200; 57223840952; 56714950900; 35500782800; 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57208316658; 55355751300; 56021813700; 56678336600; 7403068909; 7004265198; 57194461089; 59814638100; 55837375900; 57193435506; 57113392000; 7402815984; 26666313200; 57190127327; 36816303500; 8791509900; 57208321142; 14012249000; 18435453100; 59587544700; 54389941800; 6602969503; 23986018200; 57344402000; 7003371610; 55663305800; 57192669640; 55952822800; 25652194300; 7403324447; 57208321653; 25628978700; 44561693800; 58704742400; 6602795601; 57192429990; 43361892500; 56658751100; 56657947900; 6701628482; 7007019201; 57190767230; 57702184700; 57208316147; 8559107900; 24077308500; 6602323834; 6603776865; 36057630500; 57220895149; 59585850600; 7004002583; 36613480200; 57221139279; 23487579300; 55262937300; 7004299975; 24833754300; 57189852229; 57208320165; 57207446777; 57221861625; 56721395200; 57779474100; 54384535700; 56221262400; 7402601128; 55347813900; 55804393100; 36018902000; 35185850600; 55767566800; 55478882500; 55877039000 | gfparaschos@mpifr-bonn.mpg.de; | ASTRONOMY & ASTROPHYSICS | ASTRON ASTROPHYS | 0004-6361 | 1432-0746 | 682 | SCIE | ASTRONOMY & ASTROPHYSICS | 2024 | 5.8 | 18.5 | 4.64 | 2025-05-07 | 11 | 14 | techniques: high angular resolution; techniques: interferometric; galaxies: active; galaxies: individual: NGC 1275; galaxies: jets | M87 EVENT HORIZON; EXTRAGALACTIC RADIO-SOURCES; TELESCOPE RESULTS. I.; LIMB-BRIGHTENED JET; GAMMA-RAY EMISSION; LINEAR-POLARIZATION; ACCRETION; PARSEC; ENERGY; SCALE | Galaxies: active; Galaxies: individual: NGC 1275; Galaxies: jets; Techniques: high angular resolution; Techniques: interferometric | Black holes; Galaxies; Gravitation; Interferometry; Luminance; Object detection; Polarization; Radio astronomy; Stars; Temperature; Black holes; Event horizon; Galaxies active; Galaxies jets; Galaxies: individual: NGC 1275; Magnetic-field; Technique: interferometric; Techniques: high angular resolutions; U-v coverage; Very long baseline interferometry; Magnetic fields | English | 2024 | 2024-02-01 | 10.1051/0004-6361/202348308 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Rapid detection of tertiary butylated hydroquinone in food samples using Mn-MOF@f-CNF composite-modified screen-printed electrode | Hydroquinone-based organic molecules are often used as unavoidable preservatives in the food industry. Among these additives, tertiary butylated hydroquinone (TBHQ) is widely employed as a preservative in various processed foods. However, the potential health risks associated with the excessive presence of TBHQ in food products have raised significant concerns. To address this pressing issuea novel binder-free composite composed of a manganese metal-organic framework and functionalized carbon nanofibers (Mn-MOF/f-CNF) has been developed as an electrode modifier for the ultrasensitive detection of TBHQ in food samples. The Mn-MOF/f-CNF composite was achieved using the ultrasonication method, revealing a lamellar sheet-like structure of the Mn-MOF and the curly thread-like fibrous structure of f-CNF. The developed Mn-MOF/f-CNF/SPE sensor system resulted in well-defined redox signals for TBHQ detection in a neutral pH solution. Compared to the unmodified SPE system, the modified system showed approximately a 300 mV reduction in overpotential and a twofold increase in peak current signal for TBHQ detection. The Mn-MOF/f-CNF/SPE sensor system showed a linear concentration window of 0.01 to 800 mu M with a sensitivity of 6.28 mu A mu M-1 cm-2 and the obtained detection limit was 1.36 nM. Additionally, the proposed sensor displayed excellent reproducibility and repeatable results with an RSD of less than 5%. The real-time applicability of the Mn-MOF/f-CNF/SPE sensor system was demonstrated using real samples such as potato chips and instant noodles, showing excellent results with a recovery range of 95.1-98.5%. | Srinivasan, Praveenkannan; Rajaji, Umamaheswari; Sethuraman, Mathur Gopalakrishnan; Karuppiah, Chelladurai; Yusuf, Kareem; Liu, Ting-Yu | Deemed Be Univ Gandhigram, Gandhigram Rural Inst, Dept Chem, Dindigul 624302, Tamil Nadu, India; Ming Chi Univ Technol, Dept Mat Engn, New Taipei City 243303, Taiwan; Saveetha Inst Med & Tech Sci SIMATS, Saveetha Sch Engn, Ctr Appl Res, Chennai 602105, Tamil Nadu, India; Kyungpook Natl Univ, Dept Chem, Daegu 41566, South Korea; Kyungpook Natl Univ, Green Nano Mat Res Ctr, Daegu 41566, South Korea; King Saud Univ, Coll Sci, Dept Chem, Riyadh 11451, Saudi Arabia; Ming Chi Univ Technol, Ctr Environm Sustainabil & Human Hlth, R&D Ctr Biochem Engn Technol, New Taipei City 24301, Taiwan; Yuan Ze Univ, Dept Chem Engn & Mat Sci, Taoyuan 32003, Taiwan; Chang Gung Univ, Ctr Sustainabil & Energy Technol, Taoyuan 33302, Taiwan; Ming Chi Univ Technol, Res Ctr Intelligence Med Devices, New Taipei City 243303, Taiwan | Karuppiah, Chelladurai/H-7068-2019; Rajaji, Umamaheswari/P-8895-2018; Liu, Tingyu/M-5767-2019; Sethuraman, M.G./ACG-7562-2022 | 59011538700; 57202161672; 6603740519; 55910716400; 41662338900; 14048818900 | mgsethu@gmail.com;tyliu@mail.mcut.edu.tw; | MICROCHIMICA ACTA | MICROCHIM ACTA | 0026-3672 | 1436-5073 | 191 | 10 | SCIE | CHEMISTRY, ANALYTICAL | 2024 | 5.3 | 18.5 | 0 | 2025-05-07 | 2 | 2 | Antioxidant; Mn-MOF/f-CNF composite; Electrochemical detection; Differential pulse voltammetry; Ultrasonication method | ELECTROCHEMICAL SENSOR; PHENOLIC ANTIOXIDANTS; BUTYLHYDROQUINONE | Antioxidant; Differential pulse voltammetry; Electrochemical detection; Mn-MOF/f-CNF composite; Ultrasonication method | Electrochemical Techniques; Electrodes; Food Analysis; Food Contamination; Food Preservatives; Hydroquinones; Limit of Detection; Manganese; Metal-Organic Frameworks; Carbon carbon composites; Food chemistry; Food preservation; Food products; Manganese; Manganese alloys; Manganese metallurgy; 2-tert-butylhydroquinone; food preservative; hydroquinone derivative; manganese; metal organic framework; Differential pulse voltammetry; ELectrochemical detection; Food samples; Mn-MOF/f-CNF composite; Organic molecules; Rapid detection; Screen printed electrodes; Sensor systems; Ultra-sonication; Ultrasonication method; chemistry; devices; electrochemical analysis; electrode; food analysis; food contamination; limit of detection; procedures; Lamellar structures | English | 2024 | 2024-10 | 10.1007/s00604-024-06642-4 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |
| ○ | ○ | Article | Repeating flaring activity of the blazar AO 0235+164 | Context. Blazar AO 0235+164, located at a redshift of z = 0.94, has undergone several sharp multi-spectral-range flaring episodes over recent decades. In particular, the episodes that peaked in 2008 and 2015, which were subject to extensive multi-wavelength coverage, exhibited an interesting behavior. Aims. We study the actual origin of these two observed flares by constraining the properties of the observed photo-polarimetric variability as well as of the broadband spectral energy distribution and the observed time-evolution behavior of the source. We use ultra-high-resolution total-flux and polarimetric very-long-baseline interferometry (VLBI) imaging. Methods. The analysis of VLBI images allowed us to constrain kinematic and geometrical parameters of the 7 mm jet. We used the discrete correlation function to compute the statistical correlation and the delays between emission at different spectral ranges. The multi-epoch modeling of the spectral energy distributions allowed us to propose specific models of the emission; in particular, with the aim to model the unusual spectral features observed in this source in the X-ray region of the spectrum during strong multi spectral-range flares. Results. We find that these X-ray spectral features can be explained by an emission component originating in a separate particle distribution than the one responsible for the two standard blazar bumps. This is in agreement with the results of our correlation analysis, where we did not find a strong correlation between the X-ray and the remaining spectral ranges. We find that both external Compton-dominated and synchrotron self-Compton-dominated models are able to explain the observed spectral energy distributions. However, the synchrotron self-Compton models are strongly favored by the delays and geometrical parameters inferred from the observations. | Pedrosa, J. Escudero; Agudo, I.; Tramacere, A.; Marscher, A. P.; Jorstad, S.; Weaver, Z. R.; Casadio, C.; Thum, C.; Myserlis, I.; Fuentes, A.; Traianou, E.; Kim, J. -Y.; Kramer, J.; Lopez-Coto, R.; D'Ammando, F.; Bernardos, M.; Bonnoli, G.; Blinov, D. A.; Borman, G. A.; Grishina, T. S.; Hagen-Thorn, V. A.; Kopatskaya, E. N.; Larionova, E. G.; Larionov, V. M.; Larionova, L. V.; Morozova, D. A.; Savchenko, S. S.; Troitskiy, I. S.; Troitskaya, Y. V.; Vasilyev, A. A. | Inst Astrofis Andalucia, CSIC, Glorieta Astron S-N, Granada 18080, Spain; Univ Geneva, Dept Astron, Ch Ecogia 16, CH-1290 Versoix, Switzerland; Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA; Fdn Res & Technol Hellas, Inst Astrophys, Iraklion 70013, Greece; Univ Crete, Dept Phys, GR-71003 Iraklion, Greece; Inst Radioastronomie Millimetr, Ave Divina Pastora 7,Local 20, E-18012 Granada, Spain; Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 702701, South Korea; INAF, Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy; INAF, Osservatorio Astron Brera, Via E Bianchi 46, I-23807 Merate, LC, Italy; RAS, Crimean Astrophys Observ, Nauchny 298409, Russia; St Petersburg State Univ, 7-9 Univ Skaya Nab, St Petersburg 199034, Russia; Russian Acad Sci, Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia; Pulkovo Observ, St Petersburg 196140, Russia | Bernardos, María Isabel/AAC-7439-2022; Casadio, Carolina/AAH-5524-2021; Kopatskaya, Evgenia/H-4720-2013; Kim, Jae-Young/IUO-6466-2023; Hagen-Thorn, Vladimir/H-3983-2013; Larionov, Valeri/H-1349-2013; Jorstad, Svetlana/AAM-3279-2021; Blinov, Dmitry/G-9925-2013; Troitskaya, Yuliya/N-2222-2015; Larionova, Elena/H-7287-2013; Myserlis, Ioannis/MCY-5944-2025; Grishina, Tatiana/H-6873-2013; Morozova, Daria/H-1298-2013; Blinov, Dmitry/AAG-3376-2019; tramacere, andrea/B-9424-2012; Savchenko, Sergey/O-2498-2019; Bernardos Martin, Maria Isabel/AAC-7439-2022; Vasilyev, Andrey/H-9121-2013; Agudo, Ivan/G-1701-2015 | 57221698606; 55385524500; 35231778400; 7004154914; 59785012300; 57209302319; 54977749000; 7004308044; 55917789200; 56699569900; 57204824800; 57211836467; 57265228200; 55014262900; 6505606078; 57203923385; 16642159400; 35241971500; 55936419600; 57222642689; 6603686482; 22934756600; 7003552152; 7102750168; 6701451916; 36617872300; 54406295900; 35243986200; 56678473800; 57194016394 | jescudero@iaa.es; | ASTRONOMY & ASTROPHYSICS | ASTRON ASTROPHYS | 0004-6361 | 1432-0746 | 682 | SCIE | ASTRONOMY & ASTROPHYSICS | 2024 | 5.8 | 18.5 | 1.79 | 2025-05-07 | 5 | 5 | accretion, accretion disks; astroparticle physics; polarization; radiation mechanisms: general; relativistic processes; galaxies: jets | X-RAY; INNER JET; SWIFT; ACCELERATION; QUASARS; CALIBRATION; KINEMATICS; WEBT | accretion, accretion disks; astroparticle physics; galaxies: jets; polarization; radiation mechanisms: general; relativistic processes | Galaxies; Interferometry; Polarimeters; Radio astronomy; Accretion: accretion disks; Astroparticle physics; COMPTON; Galaxies jets; Multi-spectral; Radiation mechanisms: general; Relativistic process; Relativistics; Spectral energy distribution; Spectral range; Geometry | English | 2024 | 2024-02-07 | 10.1051/0004-6361/202346885 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | The persistent shadow of the supermassive black hole of M 87 I. Observations, calibration, imaging, and analysis | In April 2019, the Event Horizon Telescope (EHT) Collaboration reported the first-ever event-horizon-scale images of a black hole, resolving the central compact radio source in the giant elliptical galaxy M87. These images reveal a ring with a southerly brightness distribution and a diameter of similar to 42 mu as, consistent with the predicted size and shape of a shadow produced by the gravitationally lensed emission around a supermassive black hole. These results were obtained as part of the April 2017 EHT observation campaign, using a global very long baseline interferometric radio array operating at a wavelength of 1.3 mm. Here, we present results based on the second EHT observing campaign, taking place in April 2018 with an improved array, wider frequency coverage, and increased bandwidth. In particular, the additional baselines provided by the Greenland telescope improved the coverage of the array. Multiyear EHT observations provide independent snapshots of the horizon-scale emission, allowing us to confirm the persistence, size, and shape of the black hole shadow, and constrain the intrinsic structural variability of the accretion flow. We have confirmed the presence of an asymmetric ring structure, brighter in the southwest, with a median diameter of 43 :3(-3:1)(+1:5) mu as. The diameter of the 2018 ring is remarkably consistent with the diameter obtained from the previous 2017 observations. On the other hand, the position angle of the brightness asymmetry in 2018 is shifted by about 30 degrees relative to 2017. The perennial persistence of the ring and its diameter robustly support the interpretation that the ring is formed by lensed emission surrounding a Kerr black hole with a mass similar to 6 :5 Chi 10(9) M-circle dot. The significant change in the ring brightness asymmetry implies a spin axis that is more consistent with the position angle of the large-scale jet. | Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Bach, Uwe; Baczko, Anne-Kathrin; Ball, David; Balokovic, Mislav; Bandyopadhyay, Bidisha; Barrett, John; Baubock, Michi; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Bustamante, Sandra; Carlstrom, John E.; Chael, Andrew; Chan, Chi-Kwan; Chang, Dominic O.; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cheng, Xiaopeng; Cho, Ilje; Christian, Pierre; Conroy, Nicholas S.; Conway, John E.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Dahale, Rohan; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Dhruv, Vedant; Dihingia, Indu K.; Doeleman, Sheperd S.; Dzib, Sergio A.; Eatough, Ralph P.; Emami, Razieh; Falcke, Heino; Farah, Joseph; Fish, Vincent L.; Fomalont, Edward; Ford, H. Alyson; Foschi, Marianna; Fraga-Encinas, Raquel; Freeman, William T.; Friberg, Per; Fromm, Christian M.; Fuentes, Antonio; Galison, Peter; Gammie, Charles F.; Garcia, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gold, Roman; Gomez-Ruiz, Arturo I.; Gomez, Jose L.; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Haggard, Daryl; Hesper, Ronald; Heumann, Dirk; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; Ikeda, Shiro; Impellizzeri, C. M. Violette; Inoue, Makoto; Issaoun, Sara; James, David J.; Jannuzi, Buell T.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jones, Adam C.; Joshi, Abhishek V.; Jung, Taehyun; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, Dong-Jin; Kim, Jae-Young; Kim, Jongsoo; Kim, Junhan; Kino, Motoki; Koay, Jun Yi; Kocherlakota, Prashant; Kofuji, Yutaro; Koch, Patrick M.; Koyama, Shoko; Kramer, Carsten; Kramer, Joana A.; Kramer, Michael; Krichbaum, Thomas P.; Kuo, Cheng-Yu; La Bella, Noemi; Lee, Sang-Sung; Levis, Aviad; Li, Zhiyuan; Lico, Rocco; Lindahl, Greg; Lindqvist, Michael; Lisakov, Mikhail; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin J.; Lowitz, Amy E.; Lu, Ru-Sen; MacDonald, Nicholas R.; Mao, Jirong; Marchili, Nicola; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Mizuno, Izumi; Mizuno, Yosuke; Montgomery, Joshua; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Mulaudzi, Wanga; Mueller, Cornelia; Mueller, Hendrik; Mus, Alejandro; Musoke, Gibwa; Myserlis, Ioannis; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayanan, Gopal; Natarajan, Iniyan; Nathanail, Antonios; Fuentes, Santiago Navarro; Neilsen, Joey; Ni, Chunchong; Nowak, Michael A.; Oh, Junghwan; Okino, Hiroki; Olivares, Hector; Oyama, Tomoaki; Ozel, Feryal; Palumbo, Daniel C. M.; Paraschos, Georgios Filippos; Park, Jongho; Parsons, Harriet; Patel, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Pietu, Vincent; PopStefanija, Aleksandar; Porth, Oliver; Prather, Ben; Psaltis, Dimitrios; Pu, Hung-Yi; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Ricarte, Angelo; Ripperda, Bart; Roelofs, Freek; Romero-Canizales, Cristina; Ros, Eduardo; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruiz, Ignacio; Ruszczyk, Chet; Rygl, Kazi L. J.; Sanchez, Salvador; Sanchez-Arguelles, David; Sanchez-Portal, Miguel; Sasada, Mahito; Satapathy, Kaushik; Savolainen, Tuomas; Schloerb, F. Peter; Schonfeld, Jonathan; Schuster, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Salas, Leon David Sosapanta; Souccar, Kamal; Stanway, Joshua S.; Sun, He; Tazaki, Fumie; Tetarenko, Alexandra J.; Tiede, Paul; Tilanus, Remo P. J.; Titus, Michael; Toma, Kenji; Torne, Pablo; Toscano, Teresa; Traianou, Efthalia; Trent, Tyler; Trippe, Sascha; Turk, Matthew; van Bemmel, Ilse; van Langevelde, Huib Jan; van Rossum, Daniel R.; Vos, Jesse; Wagner, Jan; Ward-Thompson, Derek; Wardle, John; Washington, Jasmin E.; Weintroub, Jonathan; Wharton, Robert; Wielgus, Maciek; Wiik, Kaj; Witzel, Gunther; Wondrak, Michael F.; Wong, George N.; Wu, Qingwen; Yadlapalli, Nitika; Yamaguchi, Paul; Yfantis, Aristomenis; Yoon, Doosoo; Young, Andre; Younsi, Ziri; Yu, Wei; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. 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Univ Pretoria, Dept Phys, ZA-0028 Pretoria, South Africa; Rhodes Univ, Ctr Radio Astron Tech & Technol, Dept Phys & Elect, ZA-6140 Makhanda, South Africa; ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands; Univ PSL, Sorbonne Univ, Univ Paris,CNRS,Observ Paris, LESIA, 5 Pl Jules Janssen, F-92195 Meudon, France; Univ Colorado, JILA, Boulder, CO 80309 USA; Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA; Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, PR, Peoples R China; Las Cumbres Observ, 6740 Cortona Dr,Suite 102, Goleta, CA 93117 USA; Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA; Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA; MIT, Dept Elect Engn & Comp Sci, 32-D476,77 Massachusetts Ave, Cambridge, MA 02142 USA; Google Res, 355 Main St, Cambridge, MA 02142 USA; Univ Wurzburg, Inst Theoret Phys & Astrophys, Emil Fischer Str 31, D-97074 Wurzburg, Germany; Harvard Univ, Dept Hist Sci, Cambridge, MA 02138 USA; Harvard Univ, Dept Phys, Cambridge, MA 02138 USA; Univ Illinois, NCSA, 1205W Clark St, Urbana, IL 61801 USA; Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, R Matao 1226, BR-05508090 Sao Paulo, SP, Brazil; Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0-7, I-09042 Monserrato, CA, Italy; INAF, Osservatorio Astron Cagliari, Via Sci 5, I-09047 Selargius, CA, Italy; INFN, Sez Cagliari, I-09042 Monserrato, CA, Italy; Univ Southern Denmark, CP3 Origins, Campusvej 55, DK-5230 Odense M, Denmark; Inst Nacl Astrofis Opt & Electr, Apartado Postal 51&216, Puebla Pue 72000, Mexico; Consejo Nacl Humanidades Ciencia & Tecnol, Ave Insurgentes Sur 1582, Mexico City 03940, DF, Mexico; Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China; Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-12 Hoshigaoka, Mizusawa, Iwate 0230861, Japan; Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; Univ Groningen, NOVA Sub Mm Instrumentat Grp, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands; Peking Univ, Sch Phys, Dept Astron, Beijing 100871, PR, Peoples R China; Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, PR, Peoples R China; Univ Tokyo, Grad Sch Sci, Dept Astron, 7-3-1 Hongo,Bunkyo Ku, Tokyo 1130033, Japan; Inst Stat Math, 10-3 Midori Cho, Tachikawa, Tokyo 1908562, Japan; Grad Univ Adv Studies SOKENDAI, Dept Stat Sci, 10-3 Midori Cho, Tachikawa, Tokyo 1908562, Japan; Univ Tokyo, Kavli Inst Phys & Math Universe, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan; Leiden Univ, Leiden Observ, Postbus 2300, NL-9513 RA Leiden, Netherlands; ASTRAVEO LLC, POB 1668, Gloucester, MA 01931 USA; Appl Mat Inc, 35 Dory Rd, Gloucester, MA 01930 USA; Boston Univ, Inst Astrophys Res, 725 Commonwealth Ave, Boston, MA 02215 USA; Univ Sci & Technol, Gajeong Ro 217, Daejeon 34113, South Korea; Univ Tokyo, Inst Cosm Ray Res, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778582, Japan; Joint Inst VLBI ERIC JIVE, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands; Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 702701, South Korea; Korea Adv Inst Sci & Technol KAIST, Dept Phys, 291 Daehak Ro, Daejeon 34141, South Korea; Kogakuin Univ Technol & Engn, Acad Support Ctr, 2665-1 Nakano, Hachioji, Tokyo 1920015, Japan; Niigata Univ, Grad Sch Sci & Technol, 8050 Ikarashi 2 No Cho,Nishi Ku, Niigata 9502181, Japan; Natl Sun Yat Sen Univ, Dept Phys, 70 Lien Hai Rd, Kaohsiung 80424, Taiwan; Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China; Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210023, Peoples R China; INAF, Ist Radioastron, Via P Gobetti 101, I-40129 Bologna, Italy; ALMA Reg Ctr, Via P Gobetti 101, I-40129 Bologna, Italy; Natl Taiwan Univ, Dept Phys, 1 Sec 4,Roosevelt Rd, Taipei 10617, Taiwan; Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico; Chinese Acad Sci, Yunnan Observatories, Kunming 650011, Yunnan, Peoples R China; Chinese Acad Sci, Ctr Astron Mega Sci, 20A Datun Rd, Beijing 100012, Peoples R China; Chinese Acad Sci, Key Lab Struct & Evolut Celestial Objects, Kunming 650011, Yunnan, Peoples R China; 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Peking Univ, Natl Biomed Imaging Ctr, Beijing 100871, Peoples R China; Peking Univ, Coll Future Technol, Beijing 100871, Peoples R China; Tokyo Electron Technol Solut Ltd, 52 Matsunagane, Oshu, Iwate 0231101, Japan; Univ Lethbridge, Dept Phys & Astron, Lethbridge, AB T1K 3M4, Canada; Netherlands Org Sci Res NWO, Postbus 93138, NL-2509 AC The Hague, Netherlands; Tohoku Univ, Frontier Res Inst Interdisciplinary Sci, Sendai, Miyagi 9808578, Japan; Tohoku Univ, Astron Inst, Sendai, Miyagi 9808578, Japan; Seoul Natl Univ, Dept Phys & Astron, Seoul 08826, South Korea; Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA; Brandeis Univ, Dept Phys, 415 South St, Waltham, MA 02453 USA; Univ Turku, Tuorla Observ, Dept Phys & Astron, Turku, Finland; Radboud Univ Nijmegen, Radboud Excellence Fellow, Nijmegen, Netherlands; Inst Adv Study, Sch Nat Sci, 1 Einstein Dr, Princeton, NJ 08540 USA; Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Hubei, Peoples R China; Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England; Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China; Univ Sci & Technol China, Dept Astron, Hefei 230026, Peoples R China; Michigan State Univ, Dept Phys & Astron, 567 Wilson Rd, E Lansing, MI 48824 USA; Univ Vermont, Burlington, VT 05405 USA; Natl Chung Shan Inst Sci & Technol, 566 Ln 134,Longyuan Rd, Taoyuan 325, Taiwan; Western Univ, 1151 Richmond St, London, ON N6A 3K7, Canada; Osaka Metropolitan Univ, Grad Sch Sci, Dept Phys, I-1 Gakuen Cho,Naka Ku, Sakai, Osaka 5998531, Japan; Natl Cheng Kung Univ, Dept Phys, Tainan 701401, Taiwan; Coorporac Mexicana Invest Mat SC Ciencia & Tecnol, 790,Colonia Saltillo 400, Saltillo 25290, Coahuila, Mexico; Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy; INFN, Sez Trieste, I-34127 Trieste, Italy; Japan Aerosp Explorat Agcy JAXA, Ground Stn Deep Space Explorat & Telecommun GREAT, Inst Space & Astronaut Sci ISAS, 3-1-1 Yoshinodai,Chuo Ku, Sagamihara, Kanagawa 2525210, Japan | Huang, Ted/ABB-7532-2020; 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black hole physics; gravitation; galaxies: active; galaxies: individual: M 87; galaxies: jets | SAGITTARIUS A-ASTERISK; M87 EVENT-HORIZON; TELESCOPE RESULTS. VI.; RADIO-SOURCES; SCHWARZSCHILD RADII; VLBI OBSERVATIONS; SCALE STRUCTURE; CLOSURE PHASES; PHOTON RINGS; DIRECT VIEW | Accretion, accretion disks; Black hole physics; Galaxies: active; Galaxies: individual: M 87; Galaxies: jets; Gravitation | Black holes; Galaxies; Luminance; Stars; Telescopes; Accretion: accretion disks; Black Hole physics; Black holes; Event horizon; Galaxies active; Galaxies jets; Galaxies: individuals; Galaxy: individual: M 87; Size and shape; Supermassive black holes; Gravitation | English | 2024 | 2024-01-18 | 10.1051/0004-6361/202347932 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | The size-luminosity relation of the AGN torus determined from the comparison between optical and mid-infrared variability | We investigate the optical variability of low-redshift (0.15 < z <= 0.4) active galactic nuclei using multi-epoch data from the Zwicky Transient Facility. We find that a damped random walk model describes well the ensemble structure function in the g band. Consistent with previous studies, more luminous active galactic nuclei tend to have a steeper structure function at a timescale less than the break timescale and a smaller variability amplitude. By comparing the structure functions in the optical with the mid-infrared obtained from the Wide-field Infrared Survey Explorer, we derive the size of the dusty torus using a toy model for the geometry of the torus. The size of the torus positively correlates with the luminosity of the active nucleus, following a relation that agrees well with previous studies based on reverberation mapping. This result demonstrates that the structure function method can be used as a powerful and highly efficient tool to examine the size of the torus. | Kim, Minjin; Son, Suyeon; Ho, Luis C. | Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 41566, South Korea; Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China; Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China | ; Kim, Minjin/AAU-9910-2020 | 56898213300; 57226328130; 57225302746 | mkim.astro@gmail.com; | ASTRONOMY & ASTROPHYSICS | ASTRON ASTROPHYS | 0004-6361 | 1432-0746 | 689 | SCIE | ASTRONOMY & ASTROPHYSICS | 2024 | 5.8 | 18.5 | 0.71 | 2025-05-07 | 2 | 2 | quasars: general; galaxies: Seyfert | ACTIVE GALACTIC NUCLEI; SPECTRAL ENERGY-DISTRIBUTIONS; SUPERMASSIVE BLACK-HOLES; DATA RELEASE; DUST TORUS; HOT DUST; REVERBERATION MEASUREMENTS; SPACE TELESCOPE; HIGH ACCRETION; INNER RADIUS | Galaxies: Seyfert; Quasars: general | Infrared devices; Luminescence; Reverberation; Active galactic nuclei; Galaxy:seyfert; Infrared variability; Midinfrared; Optical-; Quasars:general; Random walk modeling; Red shift; Structure functions; Time-scales; Active Galactic Nuclei | English | 2024 | 2024-08-30 | 10.1051/0004-6361/202450413 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Uncovering COVID-19 transmission tree: identifying traced and untraced infections in an infection network | Introduction This paper presents a comprehensive analysis of COVID-19 transmission dynamics using an infection network derived from epidemiological data in South Korea, covering the period from January 3, 2020, to July 11, 2021. The network illustrates infector-infectee relationships and provides invaluable insights for managing and mitigating the spread of the disease. However, significant missing data hinder conventional analysis of such networks from epidemiological surveillance.Methods To address this challenge, this article suggests a novel approach for categorizing individuals into four distinct groups, based on the classification of their infector or infectee status as either traced or untraced cases among all confirmed cases. The study analyzes the changes in the infection networks among untraced and traced cases across five distinct periods.Results The four types of cases emphasize the impact of various factors, such as the implementation of public health strategies and the emergence of novel COVID-19 variants, which contribute to the propagation of COVID-19 transmission. One of the key findings is the identification of notable transmission patterns in specific age groups, particularly in those aged 20-29, 40-69, and 0-9, based on the four type classifications. Furthermore, we develop a novel real-time indicator to assess the potential for infectious disease transmission more effectively. By analyzing the lengths of connected components, this indicator facilitates improved predictions and enables policymakers to proactively respond, thereby helping to mitigate the effects of the pandemic on global communities.Conclusion This study offers a novel approach to categorizing COVID-19 cases, provides insights into transmission patterns, and introduces a real-time indicator for better assessment and management of the disease transmission, thereby supporting more effective public health interventions. | Lee, Hyunwoo; Choi, Hayoung; Lee, Hyojung; Lee, Sunmi; Kim, Changhoon | Kyungpook Natl Univ, Dept Math, Daegu, South Korea; Kyungpook Natl Univ, Nonlinear Dynam & Math Applicat Ctr, Daegu, South Korea; Kyungpook Natl Univ, Dept Stat, Daegu, South Korea; Kyung Hee Univ, Dept Appl Math, Yongin, South Korea; Pusan Natl Univ, Coll Med, Dept Prevent Med, Busan, South Korea; Pusan Natl Univ Hosp, Busan Ctr Infect Dis Control & Prevent, Busan, South Korea | ; Choi, Hayoung/U-7046-2019 | 57209160180; 56942685000; 57196021198; 55716483800; 57203626040 | hayoung.choi@knu.ac.kr; | FRONTIERS IN PUBLIC HEALTH | FRONT PUBLIC HEALTH | 2296-2565 | 12 | SCIE;SSCI | PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH | 2024 | 3.4 | 18.5 | 0 | 2025-04-16 | 1 | 0 | COVID-19; infection network; contact tracing; reproduction number; untraced infection | EPIDEMIOLOGY | contact tracing; COVID-19; infection network; reproduction number; untraced infection | Adolescent; Adult; Aged; Child; Child, Preschool; Contact Tracing; COVID-19; Female; Humans; Infant; Infant, Newborn; Male; Middle Aged; Republic of Korea; SARS-CoV-2; Young Adult; adolescent; adult; aged; child; contact examination; coronavirus disease 2019; epidemiology; female; human; infant; male; middle aged; newborn; preschool child; Severe acute respiratory syndrome coronavirus 2; South Korea; young adult | English | 2024 | 2024-06-03 | 10.3389/fpubh.2024.1362823 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | ○ | Article | Unveiling the bent-jet structure and polarization of OJ 287 at 1.7 GHz with space VLBI | We present total intensity and linear polarization images of OJ 287 at 1.68 GHz, obtained through space-based very long baseline interferometry (VLBI) observations with RadioAstron on April 16, 2016. The observations were conducted using a ground array consisting of the Very Long Baseline Array (VLBA) and the European VLBI Network (EVN). Ground-space fringes were detected with a maximum projected baseline length of similar to 5.6 Earth's diameter, resulting in an angular resolution of similar to 530 mu as. With this unprecedented resolution at such a low frequency, the progressively bending jet structure of OJ 287 has been resolved up to similar to 10 parsec of the projected distance from the radio core. In comparison with close-in-time VLBI observations at 15, 43, 86 GHz from MOJAVE and VLBA-BU-BLAZAR monitoring projects, we obtain the spectral index map showing the opaque core and optically thin jet components. The optically thick core has a brightness temperature of similar to 10(13) K, and is further resolved into two sub-components at higher frequencies labeled C1 and C2. These sub-components exhibit a transition from optically thick to thin, with a synchrotron self-absorption (SSA) turnover frequency estimated to be similar to 33 and similar to 11.5 GHz, and a turnover flux density similar to 4 and similar to 0.7 Jy, respectively. Assuming a Doppler boosting factor of 10, the SSA values provide the estimate of the magnetic field strengths from SSA of similar to 3.4 G for C1 and similar to 1.0 G for C2. The magnetic field strengths assuming equipartition arguments are also estimated as similar to 2.6 G and similar to 1.6 G, respectively. The integrated degree of linear polarization is found to be approximately similar to 2.5%, with the electric vector position angle being well aligned with the local jet direction at the core region. This alignment suggests a predominant toroidal magnetic field, which is in agreement with the jet formation model that requires a helical magnetic field anchored to either the black hole ergosphere or the accretion disk. Further downstream, the jet seems to be predominantly threaded by a poloidal magnetic field. | Cho, Ilje; Gomez, Jose L.; Lico, Rocco; Zhao, Guang-Yao; Traianou, Efthalia; Dahale, Rohan; Fuentes, Antonio; Toscano, Teresa; Foschi, Marianna; Kovalev, Yuri Y.; Lobanov, Andrei; Pushkarev, Alexander B.; Gurvits, Leonid I.; Kim, Jae-Young; Lisakov, Mikhail; Voitsik, Petr; Myserlis, Ioannis; Poetzl, Felix; Ros, Eduardo | CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, Granada 18008, Spain; Korea Astron & Space Sci Inst, Daedeok Daero 776, Daejeon 34055, South Korea; Yonsei Univ, Dept Astron, Yonsei Ro 50, Seoul 03722, South Korea; Ist Radioastron, INAF, Via P Gobetti 101, I-40129 Bologna, Italy; Max Planck Inst Radioastron, Auf dem Hugel 69, D-53121 Bonn, Germany; Russian Acad Sci, Lebedev Phys Inst, Leninsky prospekt 53, Moscow 119991, Russia; Moscow Inst Phys & Technol, Inst per 9, Dolgoprudnyi 141700, Moscow, Russia; Crimean Astrophys Observ, Crimea 98409, Ukraine; Joint Inst VLBI ERIC, JIVE, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands; Delft Univ Technol, Fac Aerosp Engn, Kluyverweg 1, NL-2629 HS Delft, Netherlands; Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 702701, South Korea; Inst Radioastronomie Millimetr, Ave Divina Pastora 7,Local 20, Granada 18012, Spain; Inst Astrophys, Fdn Res & Technol Hellas, N Plastira 100, Iraklion 70013, Greece | Lico, Rocco/L-8308-2019; Voitsik, Petr/M-6075-2013; Kim, Jae-Young/IUO-6466-2023; Toscano, Teresa/ITV-2430-2023; Kovalev, Yuri/J-5671-2013; Toscano Domingo, Teresa/ITV-2430-2023; Pushkarev, Alexander/M-9997-2015; Fuentes, Antonio/R-3900-2019; Gomez, Jose L./C-4195-2008; Lisakov, Mikhail/M-6034-2013; Gómez, José/C-4195-2008; Ros, Eduardo/B-1014-2015; Lisakov, Mikhail/JAX-3277-2023; Myserlis, Ioannis/MCY-5944-2025; Cho, Ilje/LSL-5339-2024 | 57203071154; 7402094981; 55363924100; 55478882500; 57204824800; 57274820700; 56699569900; 57702184700; 58079527600; 7004589011; 7101957568; 7005104223; 7006254892; 57211836467; 25958231300; 24400306800; 55917789200; 57211839957; 7102531000 | icho@kasi.re.kr; | ASTRONOMY & ASTROPHYSICS | ASTRON ASTROPHYS | 0004-6361 | 1432-0746 | 683 | SCIE | ASTRONOMY & ASTROPHYSICS | 2024 | 5.8 | 18.5 | 0 | 2025-05-07 | 1 | 0 | galaxies: active; galaxies: jets; quasars: supermassive black holes; radio continuum: galaxies | ACTIVE GALACTIC NUCLEI; GAMMA-RAY EMISSION; PARSEC-SCALE JETS; BRIGHTNESS TEMPERATURE; KINEMATICS ANALYSIS; MAGNETIC-FIELD; AGN JETS; BINARY; BLAZARS; OJ-287 | Galaxies: active; Galaxies: jets; Quasars: supermassive black holes; Radio continuum: galaxies | Black holes; Earth (planet); Gravitation; Magnetic fields; Maps; Polarization; Radio astronomy; Galaxies active; Galaxies jets; Jet structure; Long baseline array; Quasar: supermassive black hole; Radio continuum: galaxies; Self absorption; Sub-components; Supermassive black holes; Very long baseline interferometry; Stars | English | 2024 | 2024-03-22 | 10.1051/0004-6361/202347157 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | Correction | Unveiling the bent-jet structure and polarization of OJ 287 at 1.7 GHz with space VLBI (Vol 683, A248, 2024) | Cho, Ilje; Gomez, Jose L.; Lico, Rocco; Zhao, Guang-Yao; Traianou, Efthalia; Dahale, Rohan; Fuentes, Antonio; Toscano, Teresa; Foschi, Marianna; Kovalev, Yuri Y.; Lobanov, Andrei; Pushkarev, Alexander B.; Gurvits, Leonid I.; Kim, Jae-Young; Lisakov, Mikhail; Voitsik, Petr; Myserlis, Ioannis; Poetzl, Felix; Ros, Eduardo | CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain; Korea Astron & Space Sci Inst, Daedeok Daero 776, Daejeon 34055, South Korea; Yonsei Univ, Dept Astron, Yonsei Ro 50, Seoul 03722, South Korea; Ist Radioastron INAF, Via P Gobetti 101, I-40129 Bologna, Italy; Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Russian Acad Sci, Lebedev Phys Inst, Leninsky Prospekt 53, Moscow 119991, Russia; Moscow Inst Phys & Technol, Institutsky Per 9, Moscow 141700, Russia; Crimean Astrophys Observ, Nauchny 98409, Crimea, Russia; Joint Inst VLBI ER JIVE, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands; Delft Univ Technol, Fac Aerosp Engn, Kluyverweg 1, NL-2629 HS Delft, Netherlands; Kyungpook Natl Univ, Dept Astron & Atmospher Sci, Daegu 702701, South Korea; Inst Radioastronomie Millimetr, Ave Divina Pastora 7,Local 20, E-18012 Granada, Spain; Fdn Res & Technol Hellas, Inst Astrophys, N Plastira 100, Iraklion 71110, Greece | Lisakov, Mikhail/M-6034-2013; Myserlis, Ioannis/MCY-5944-2025; Lisakov, Mikhail/KIH-4326-2024; Pushkarev, Alexander/M-9997-2015; Toscano, Teresa/ITV-2430-2023; Kovalev, Yuri/J-5671-2013; Gomez, Jose L./C-4195-2008; Toscano Domingo, Teresa/ITV-2430-2023; Lico, Rocco/L-8308-2019; Fuentes, Antonio/R-3900-2019; Gómez, José/C-4195-2008; Kim, Jae-Young/IUO-6466-2023; Voitsik, Petr/M-6075-2013 | icho@kasi.re.kr; | ASTRONOMY & ASTROPHYSICS | ASTRON ASTROPHYS | 0004-6361 | 1432-0746 | 692 | SCIE | ASTRONOMY & ASTROPHYSICS | 2024 | 5.8 | 18.5 | 0 | galaxies: active; galaxies: jets; quasars: supermassive black holes; radio continuum: galaxies; errata; addenda | English | 2024 | 2024-12-02 | 10.1051/0004-6361/202452745e | 바로가기 | 바로가기 | 바로가기 | ||||||||||||
| ○ | Meeting Abstract | Desing and method of Korean pEdiatric cohort studY for improving outcome in NephrOTic syndrome (KEYNOTE): a nationwide prospective cohort | Min, Jeesu; Ahn, Yo Han; Cho, Heeyeon; Cho, Min Hyun; Kim, Ji Hyun; Park, Eujin; Cho, Myung Hyun; Han, Kyoung Hee; Choi, Naye; Lee, Hyun Kyung; Kang, Hee Gyung; Yang, Eun Mi | Chungnam Natl Univ, Sejong Hosp, Dept Pediat, Sejong, South Korea; Seoul Natl Univ, Childrens Hosp, Dept Pediat, Seoul, South Korea; Samsung Med Ctr, Dept Pediat, Seoul, South Korea; Kyungpook Natl Univ Hosp, Dept Pediat, Daegu, South Korea; Seoul Natl Univ, Bundang Hosp, Dept Pediat, Sungnam, South Korea; Korea Univ, Guro Hosp, Dept Pediat, Seoul, South Korea; Hallym Univ, Sacred Heart Hosp, Dept Pediat, Anyang, South Korea; Jeju Natl Univ, Sch Med, Dept Pediat, Jeju, South Korea; Korea Univ Hosp, Dept Pediat, Seoul, South Korea; Chungang Univ Hosp, Dept Pediat, Seoul, South Korea; Chonnam Natl Univ Hosp, Dept Pediat, Gwangju, South Korea | cho, myung hyun/AEB-7941-2022; CHOI, NAYE/KCL-4467-2024 | PEDIATRIC NEPHROLOGY | PEDIATR NEPHROL | 0931-041X | 1432-198X | 39 | 1 | SCIE | PEDIATRICS;UROLOGY & NEPHROLOGY | 2024 | 2.6 | 18.6 | 0 | English | 2024 | 2024-09 | 바로가기 | 바로가기 | |||||||||||||||
| ○ | ○ | Article | Driving function in wave field synthesis with integral approximation considering uneven contribution of loudspeaker units | Wave field synthesis is a spatial audio technique for reproducing the sound field of a target source. This process is implemented by applying driving functions to loudspeakers enclosing a listening space. To reduce computational and hardware costs, several studies assume that the target source is sufficiently far from the loudspeakers, but this assumption depends on source frequency and can lead to errors. A recent method attempted to address this issue using oversampling and averaging; however, this approach increases computational demands, particularly for multiple target sources. Such steps result in high computational costs when there are numerous target sources. In this study, we propose an alternative method using an integral approximation that imitates the linearity of integral operations, taking into account the uneven contributions of loudspeakers. This eliminates the need for oversampling and averaging. Simulation results showed that our method improved sound reproduction compared to the recent method at high frequencies and conventional methods at low frequencies, especially when the target source was close to loudspeakers and not aligned with them. Our approach could potentially be applied to tasks that use the same integrand, widely used to model sources and fields. | Jeon, Inkoo; Lee, Seokjin | Kyungpook Natl Univ, Sch Elect & Elect Engn, 80 Daehak Ro, Daegu, South Korea | 59475546100; 59510702600 | sjlee6@knu.ac.kr; | JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA | J ACOUST SOC AM | 0001-4966 | 1520-8524 | 156 | 6 | SCIE | ACOUSTICS;AUDIOLOGY & SPEECH-LANGUAGE PATHOLOGY | 2024 | 2.3 | 18.6 | 0.66 | 2025-05-07 | 1 | 1 | article; simulation; synthesis | English | 2024 | 2024-12 | 10.1121/10.0034558 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||||
| ○ | ○ | Article | A Comparison Study of Nipple-Areolar Complex Measurement: Light Detection and Ranging (LiDAR) Camera Versus Photometry | BackgroundIn breast surgery, achieving esthetic outcomes with symmetry is crucial. The nipple-areolar complex (NAC) plays a significant role in breast characteristic measurement. Various technologies have advanced measurement techniques, and light detection and ranging (LiDAR) technology using three-dimensional scanning has been introduced in engineering. Increasing effort has been exerted to integrate such technologies into the medical field. This study focused on measuring NAC using a LiDAR camera, comparing it with traditional methods, and aimed to establish the clinical utility of LiDAR for obtaining favorable esthetic results.MethodsA total of 44 patients, who underwent breast reconstruction surgery, and 65 NACs were enrolled. Measurements were taken (areolar width [AW], nipple width [NW] and nipple projection [NP]) using traditional methods (ruler and photometry) and LiDAR camera. To assess correlations and explore clinical implications, patient demographics and measurement values were collected.ResultsNAC measurements using a periscope and LiDAR methods were compared and correlated. LiDAR measurement accuracy was found to be high, with values above 95% for AW, NW and NP. Significant positive correlations were observed between measurements obtained through both methods for all parameters. When comparing body mass index, breast volume with AW and NW with NP, significant correlations were observed. These findings demonstrate the reliability and utility of LiDAR-based measurements in NAC profile assessment and provide valuable insights into the relationship between patient demographics and NAC parameters.ConclusionsLiDAR-based measurements are effective and can replace classical methods in NAC anthropometry, contributing to consistent and favorable esthetic outcomes in breast surgery.Level of Evidence IIThis journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors https://www.springer.com/00266. | Kim, Hyunbin; Na, Sungdae; Kang, Byeongju; Lee, Jeeyeon; Park, Ho Yong; Ryu, Jeong Yeop; Yang, Jung Dug; Lee, Joon Seok | Kyungpook Natl Univ, Chilgok Hosp, Sch Med, Dept Plast & Reconstruct Surg, 807 Hoguk Ro, Daegu 41404, South Korea; Kyungpook Natl Univ Hosp, Dept Biomed Engn, Daegu, South Korea; Kyungpook Natl Univ, Chilgok Hosp, Sch Med, Dept Surg, Daegu, South Korea | Ryu, Jeong Yeop/GLQ-9419-2022; Yang, Jung/R-7806-2019; PARK, JUN-YOUNG/P-5981-2015; LEE, JIN/Q-3108-2018; Lee, Jong-Mok/KVY-9550-2024 | 58533878200; 58568894400; 57279815300; 37079213100; 56564377200; 56366349400; 55171704700; 56496041000 | daniel302@naver.com;rjyflying@naver.com;lambyang@knu.ac.kr;leejspo@knu.ac.kr; | AESTHETIC PLASTIC SURGERY | AESTHET PLAST SURG | 0364-216X | 1432-5241 | 48 | 12 | SCIE | SURGERY | 2024 | 2.8 | 18.7 | 0 | 2025-05-07 | 0 | 0 | Nipple-areolar complex; Anthropometry; LiDAR; Breast reconstruction; Nipple reconstruction | Anthropometry; Breast reconstruction; LiDAR; Nipple reconstruction; Nipple–areolar complex | Adult; Cohort Studies; Esthetics; Female; Humans; Imaging, Three-Dimensional; Mammaplasty; Middle Aged; Nipples; Photography; Photometry; adult; breast reconstruction; cohort analysis; comparative study; esthetics; female; human; middle aged; nipple; photography; photometry; procedures; surgery; three-dimensional imaging | English | 2024 | 2024-06 | 10.1007/s00266-023-03618-2 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | ||
| ○ | ○ | Article | Big data analysis on manufacturing variables affecting properties of medium density fiberboard | The properties of medium density fiberboard (MDF) panels manufactured by reconstituting wood fibers and binders under high temperature and pressure depend on various manufacturing variables, including wood-related parameters, adhesive-related ones, and process-related ones. This study focused on the analysis of big data (about 400 million data) of the manufacturing variables (1389 variables) of MDF panels to understand the influence of these variables on the properties of MDF, using Ridge, Lasso, and Elastic-net regression. Both Lasso and Elastic-net regression were better than Ridge one in predicting the properties of MDF. The analysis results also showed that flash tube dryer, mat forming, and hot-pressing variables were closely related to panel density while fiber bin, refiner, forming, press, and hot-press heating variables affected the modulus of rupture (MOR) of the MDF panel. The analysis of interactions between manufacturing variables and MDF properties showed that the panel density affected internal bond (IB) strength, core density, and moisture content while IB strength and moisture content were associated with the MOR of the MDF panel. However, it is not clear which variables are dominantly affecting the formaldehyde emission of MDF. | Park, Seongsu; Park, Byung-Dae; Kim, Yongku | Kyungpook Natl Univ, Dept Wood & Paper Sci, Daegu 41566, South Korea; Kyungpook Natl Univ, Dept Stat, Daegu 41566, South Korea | Park, Byung-Dae/ABB-1934-2020 | 57220771754; 7402834820; 47962102500 | byungdae@knu.ac.kr; | EUROPEAN JOURNAL OF WOOD AND WOOD PRODUCTS | EUR J WOOD WOOD PROD | 0018-3768 | 1436-736X | 82 | 2 | SCIE | FORESTRY;MATERIALS SCIENCE, PAPER & WOOD | 2024 | 2.5 | 18.7 | 0 | 2025-05-07 | 1 | 1 | REGULARIZATION; REGRESSION; WOOD; PREDICTION; SELECTION; MODELS; RIDGE | Adhesives; Fibers; Hot Pressing; Moisture; Rupture Modulus; Wood; Adhesives; Big data; Ductile fracture; Fibers; Hot pressing; Moisture determination; Presses (machine tools); Wood; Elastic net; High temperature and pressure; Internal bond strengths; Mat forming; Medium density fiberboard panels; Medium density fiberboards; Modulus of rupture; Panel density; Property; Woodfiber; Moisture | English | 2024 | 2024-04 | 10.1007/s00107-023-02030-6 | 바로가기 | 바로가기 | 바로가기 | 바로가기 | |||
| ○ | Article | Biportal Endoscopic Transforaminal Interbody Fusion: Comparing Primary Versus Revision Cases | Background:The safety and efficacy of biportal endoscopic lumbar interbody fusion (BELIF) has been supported by many articles. Advantages include earlier rehabilitation and equal or superior fusion rates compared with other lumbar interbody fusion techniques.Purpose:To compare the clinical and radiological outcomes of primary and revision biportal endoscopic interbody fusion.Methods:Seventy-two consecutive patients who underwent primary and revision BELIF and had at least 2-year follow-up were investigated. Clinical outcomes, including Oswestry Disability Index, the visual analog system (VAS), MacNab's criteria, surgical time, and length of hospital stay, were recorded. Radiological outcome was assessed by CT and graded according to Bridwell system.Results:No notable difference was found in preoperative baselines between the groups. Both groups demonstrated similar clinical improvement in VAS, Oswestry Disability Index, and MacNab criteria. Durotomies were more common in the revision setting (4/33 vs. 0/39 in primary), and surgical time was statistically longer (121.4 ± 21.5 minutes primary versus 179 ± 23.7 minutes revision; P < 0.001). However, no difference was observed in fusion rates at all times points graded by CT scan (94.87% vs. 93.93% primary versus revision at the final follow-up, P = 0.51).Conclusion:Revision BELIF demonstrate similar clinical and radiographic outcomes compared with primary BELIF, yet surgical time and durotomy risks are increased.Study Design:Retrospective study © American Academy of Orthopaedic Surgeons. | Kim, Ju-Eun; Park, Eugene J.; Park, Daniel K. | Baro Seomyeon Hospital Busan, Busan, South Korea; The Orthopedic Surgery, Kyungpook National University Hospital, Daegu, South Korea, William Beaumont University Hospital, United States; The Orthopedic Surgery, Michigan Orthopedic Surgeons, Southfield, MI, United States | 56487007900; 55371642100; 24336011200 | danparkmd@gmail.com; | Journal of the American Academy of Orthopaedic Surgeons | J AM ACAD ORTHOP SUR | 1067-151X | 1940-5480 | SCIE | ORTHOPEDICS;SURGERY | 2024 | 2.8 | 18.7 | 0 | 2025-05-07 | 0 | English | Article in press | 2024 | 10.5435/jaaos-d-23-01031 | 바로가기 | 바로가기 | 바로가기 | |||||||||||
| ○ | ○ | Article | Impact of COVID-19 pandemic on interhospital transfer of patients with major trauma in Korea: a retrospective cohort study | Background Interhospital transfer (IHT) is necessary for providing ultimate care in the current emergency care system, particularly for patients with severe trauma. However, studies on IHT during the pandemic were limited. Furthermore, evidence on the effects of the coronavirus disease 2019 (COVID-19) pandemic on IHT among patients with major trauma was lacking. Method This retrospective cohort study was conducted in an urban trauma center (TC) of a tertiary academic affiliated hospital in Daegu, Korea. The COVID-19 period was defined as from February 1, 2020 to January 31, 2021, whereas the pre-COVID-19 period was defined as the same duration of preceding span. Clinical data collected in each period were compared. We hypothesized that the COVID-19 pandemic negatively impacted IHT. Results A total of 2,100 individual patients were included for analysis. During the pandemic, the total number of IHTs decreased from 1,317 to 783 (- 40.5%). Patients were younger (median age, 63 [45-77] vs. 61[44-74] years, p = 0.038), and occupational injury was significantly higher during the pandemic (11.6% vs. 15.7%, p = 0.025). The trauma team activation (TTA) ratio was higher during the pandemic both on major trauma (57.3% vs. 69.6%, p = 0.006) and the total patient cohort (22.2% vs. 30.5%, p < 0.001). In the COVID-19 period, duration from incidence to the TC was longer (218 [158-480] vs. 263[180-674] minutes, p = 0.021), and secondary transfer was lower (2.5% vs. 0.0%, p = 0.025). Conclusion We observed that the total number of IHTs to the TC was reduced during the COVID-19 pandemic. Overall, TTA was more frequent, particularly among patients with major trauma. Patients with severe injury experienced longer duration from incident to the TC and lesser secondary transfer from the TC during the COVID-19 pandemic. | Cho, Sung Hoon; Nho, Woo Young; Lee, Dong Eun; Ahn, Jae Yun; Kim, Joon-Woo; Lim, Kyoung Hoon; Ryoo, Hyun Wook; Kim, Jong Kun | Kyungpook Natl Univ, Kyungpook Natl Univ Hosp, Trauma Ctr, Sch Med, Daegu, South Korea; Kyungpook Natl Univ, Sch Med, Dept Surg, Daegu, South Korea; Kyungpook Natl Univ, Sch Med, Dept Emergency Med, Daegu, South Korea; Kyungpook Natl Univ, Sch Med, Dept Orthopaed Surg, Daegu, South Korea | Ahn, Jae Yun/N-2652-2017; Kim, Joo/JAZ-0897-2023; Nho, Woo Young/JLN-0752-2023; Kim, Jwa/AAH-9915-2021 | 57755400700; 57215831839; 57202299238; 56937505400; 22951329000; 25630643100; 55350557500; 55915816900 | wooyoung.nho@gmail.com; | BMC EMERGENCY MEDICINE | BMC EMERG MED | 1471-227X | 24 | 1 | SCIE | EMERGENCY MEDICINE | 2024 | 2.6 | 18.7 | 1.12 | 2025-05-07 | 1 | 1 | Interhospital transfer; Major trauma; Trauma center; COVID-19 | INJURED PATIENTS; OUTBREAK; OUTCOMES; LEVEL | COVID-19; Interhospital transfer; Major trauma; Trauma center | COVID-19; Humans; Middle Aged; Pandemics; Patient Transfer; Republic of Korea; Retrospective Studies; Trauma Centers; adult; aged; Article; clinical feature; clinical study; cohort analysis; controlled study; coronavirus disease 2019; disease duration; evidence based practice; female; human; injury severity; Korea; major clinical study; male; occupational accident; pandemic; patient transport; retrospective study; tertiary care center; coronavirus disease 2019; emergency health service; middle aged; pandemic; patient transport; South Korea | English | 2024 | 2024-04-03 | 10.1186/s12873-024-00963-6 | 바로가기 | 바로가기 | 바로가기 | 바로가기 |
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