Papers - KODERA Sachiko
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Sensitivity of electrocardiogram on electrode-pair locations for wearable devices: Computational analysis of amplitude and waveform distortion Reviewed
K. Sanjo, K. Hebiguchi, C. Tang, E. A. Rashed, S. Kodera, H. Togo, A. Hirata
Biosensors 14 ( 3 ) 153 2024.03
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.3390/bios14030153
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Individual and group-level optimization of electric field in deep brain region during multichannel transcranial electrical stimulation Reviewed
H. Nishimoto, S. Kodera, N. Otsuru, and A. Hirata
Frontiers in Neuroscience 18 1332135 2024.03
Language：English Publishing type：Research paper (scientific journal)
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The thermal sensation threshold and its reliability induced by the exposure to 28 GHz millimeter-wave Reviewed
A. Yuasa, S. Uehara, K. Ushizawa, S. Kodera, N. Arai, A. Hirata, Y. Otaka
Frontiers in Neuroscience 18 1331416 2024.02
Language：English Publishing type：Research paper (scientific journal)
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High-resolution EEG source localization in personalized segmentation-free head model with multi-dipole fitting Reviewed
A. Hirata, M. Niitsu, C. R. Phang, S. Kodera, T. Kida, E. A. Rashed, M. Fukunaga, N. Sadato, and T. Wasaka
Physics in Medicine & Biology 69 ( 5 ) 055013 2024.02
Language：English Publishing type：Research paper (scientific journal)
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Spatially averaged epithelial/absorbed power density for nonplanar skin models exposed to antenna at 10–90 GHz Reviewed International coauthorship
K. Li, S. Kodera, D. Poljak, Y. Diao, K. Sasaki, S. Zhang, M. Yao, A. Kapetanovic, C. Li, T. Wu, T. Liebig, W. Simon, A. Hirata
IEEE Access 2024.01
Language：English Publishing type：Research paper (scientific journal)
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Estimating the perception threshold of electrostimulation and heating for radiofrequency contact current (in press) Reviewed
S. Kodera, S. Kimura, S. Uehara, A. Yuasa, K. Ushizawa, Y. Otaka, A. Hirata
IEEE Transactions on Electromagnetic Compatibility 2024
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Wireless power transfer systems with composite cores for magnetic field shielding with electric vehicles Reviewed International coauthorship
X. Duan, J. Lan, S. Kodera, J. Kirchner, G. Fischer, A. Hirata
IEEE Access 11 144887 - 144901 2023.12
Language：English Publishing type：Research paper (scientific journal)
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核白内障における環境温度の変化に伴う水晶体中ミトコンドリア機能について
武田 峻, 山本 直樹, 初坂 奈津子, 平松 範子, 長井 紀章, 出口 粧央里, 中澤 洋介, 高田 匠, 小寺 紗千子, 平田 晃正, 久保 江理, 佐々木 洋
金沢医科大学雑誌 48 ( 2 ) 89 - 89 2023.12
Language：Japanese Publisher：金沢医科大学医学会
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Association of nuclear cataract prevalence with UV radiation and heat load in lens of older people -five city study-
Kotaro Kinoshita, Sachiko Kodera, Natsuko Hatsusaka, Ryusuke Egawa, Hiroyuki Takizawa, Eri Kubo, Hiroshi Sasaki, Akimasa Hirata
Environmental Science and Pollution Research 30 ( 59 ) 123832 - 123842 2023.11
Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC
Epidemiological studies have reported that the frequency of nuclear cataracts (NUCs) is high among the elderly and in tropical countries. Ultraviolet (UV) irradiation and lens temperature are considered as key physical contributors, although their precise quantification is difficult. The aim of this study is to investigate the association of NUC prevalence with UV irradiation and heat load. First, we assessed the lens temperature using thermodynamic modeling considering the thermophysiological response. We then conducted a multivariate linear regression analysis for the epidemiological analysis of NUC prevalence across five cities. A strong correlation was observed between NUC prevalence and the combined effects of UV irradiation and cumulative equivalent minutes at 43 °C (CEM43°C) derived from the computed lens temperature (adjusted R2 = 0.933, p < 0.0001). Heat load significantly contributed to the prevalence at 52%, surpassing the contributions of UV irradiation (31%) and the decline in DNA repair capacity in the lens (17%). These results suggested that both UV radiation and heat load are associated with NUC, with heat load contributing more. Our findings provided important implications for future interventions, particularly in the context of global warming.
DOI： 10.1007/s11356-023-31079-2
Other Link： https://link.springer.com/article/10.1007/s11356-023-31079-2/fulltext.html
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Excessive whole-body exposure to 28 GHz quasi-millimeter wave induces thermoregulation accompanied by a change in skin blood flow proportion in rats Reviewed
E. Ijima, S. Kodera, A. Hirata, T. Hikage, A. Matsumoto, T. Ishitake, and H. Masuda
Frontiers in Public Health 11 1225896 2023.09
Language：English Publishing type：Research paper (scientific journal)
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Population-level immunity for transient suppression of COVID-19 waves in Japan from April 2021 to September 2022 Reviewed
S. Kodera, H. Ueta, T. Unemi, T. Nakata, A. Hirata
Vaccines 11 ( 9 ) 1457 2023.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Calculation of electric field induced in the human body for simultaneous exposure to spatially uniform ELF electric and magnetic fields with a phase difference Reviewed
Y. Sekiba, S. Kodera, K. Yamazaki, A. Hirata
IEEE Acccess 11 95455 - 95466 2023.09
Language：English Publishing type：Research paper (scientific journal)
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Computation of whole-body average SAR in realistic human models from 1 to 100 GHz Reviewed International coauthorship
S. Kodera, K. Taguchi, Y. Diao, T. Kashiwa, and A. Hirata
IEEE Transactions on Microwave Theory and Techniques 2023.09
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Computer-aided fast brain function mapping by transcranial magnetic stimulation
K. Hikita, K. Iijima, S. Kodera, S. Ueno, A. Hirata
URSI GASS 2023 2023.08
Language：English Publishing type：Research paper (international conference proceedings) Publisher：URSI GASS
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Optimization of electrode positions for multi-electrodes tES for deep brain stimulations
H. Nishimoto, S. Kodera, A. Hirata
URSI GASS 2023 2023.08
Language：English Publishing type：Research paper (international conference proceedings) Publisher：URSI GASS
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Characteristics of current perception produced by intermediate-frequency contact currents in healthy adults Reviewed
S. Uehara, A. Yuasa, K. Ushizawa, S. Kodera, Y. Kamimura, A. Hirata, Y. Otaka
Frontiers in Neuroscience 17 1145505 2023.04
Language：English Publishing type：Research paper (scientific journal)
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Projection of COVID-19 positive cases considering hybrid immunity: Case study in Tokyo Reviewed
Sachiko Kodera, Akito Takada, Essam A. Rashed, and Akimasa Hirata
Vaccines 11 ( 3 ) 633 2023.03
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Whole-Body Exposure System Using Horn Antennas with Dielectric Lens at 28 GHz
Sachiko Kodera, Norika Miura, Yinliang Diao, Miyako Inoue, Takashi Hikage, Kenji Taguchi, Hiroshi Masuda, Akimasa Hirata
IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology 7 ( 1 ) 65 - 72 2023.03
Publishing type：Research paper (scientific journal)
In the revised international guidelines and standard for human protection from electromagnetic fields, the permissible specific absorption rate (SAR) for whole-body exposure has been extended from 3 or 10 GHz to 300 GHz. The rationale for this revision is the extrapolation from findings of conventional radio-frequency exposure and infrared radiation. However, experiments of whole-body exposure in human subjects are limited to a few studies, which were conducted below 6 GHz. In this study, an exposure system at 28 GHz targeting a wide area of the human back was developed, which consists of two horn antennas with a dielectric lens. The effectiveness of the proposed exposure system was evaluated by computational dosimetry and experiments. The computed power absorption and measured distributions in the wave absorber and the back of the human subject were in good agreement. Under the compliance with the local exposure limits, the whole-body average SAR was 0.35 W/kg, which is comparable to the limit for whole-body exposure of 0.4 W/kg for occupational exposure in the international guidelines and standard. The developed exposure system would be useful to evaluate the thermophysiological response to whole-body exposure above 6 GHz.
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Whole-body exposure system using horn antennas with dielectric lens at 28 GHz Reviewed International coauthorship
S. Kodera, N. Miura, Y. Diao, M. Inoue, T. Hikage, K. Taguchi, H. Masuda, and A. Hirata
IEEE Journal of Electromagnetics, RF, and Microwaves in Medicine and Biology 2023.03
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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幼若雄ラットへの5Gミリ波短時間全身ばく露に対するストレス応答の定量的評価 Reviewed
松本 明子, 遠藤 郁実, 井島 悦子, 平田 晃正, 小寺 紗千子, 市場 正良, 土器屋 美貴子, 増田 宏
日本衛生学雑誌 78 ( Suppl. ) S187 - S187 2023.03
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：(一社)日本衛生学会
