Papers - KODERA Sachiko
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A. Hirata, S. Kodera Invited Reviewed
Difference of ICNIRP guidelines and IEEE C95. 1 standard for human protection from radio-frequency exposures
2020 International Symposium on Electromagnetic Compatibility-EMC EUROPE 2020.09
Language：English Publishing type：Research paper (international conference proceedings)
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Correlation between estimated thermoregulatory responses and pacing in athletes during marathon Reviewed International coauthorship
S. Kodera, T. Kamiya, T. Miyazawa, A. Hirata
IEEE Acccess 173079 - 173091 2020.09
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Model-based approach for analyzing prevalence of nuclear cataracts in elderly residents Reviewed International coauthorship
S. Kodera, A. Hirata, F. Miura, E. A. Rashed, N. Hatsusaka, N. Yamamoto, E. Kubo, and H. Sasaki
Computers in Biology and Medicine 126 104009 2020.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Correlation between COVID-19 morbidity and mortality rates in Japan and local population density, temperature, and absolute humidity Reviewed
S. Kodera, E. A. Rashed, and A. Hirata
International Journal of Environmental Research and Public Health 17 5477 2020.07
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Influence of absolute humidity and population density on COVID-19 spread and decay durations: Multi-prefecture study in Japan Reviewed
E. A. Rashed, S. Kodera, J. Gomez-Tames, and A. Hirata
International Journal of Environmental Research and Public Health 17 5354 2020.07
Language：English Publishing type：Research paper (scientific journal)
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Estimation of time-course core temperature and water loss in realistic adult and child models with urban micrometeorology prediction Reviewed
T. Kamiya, R. Onishi, S. Kodera, and A. Hirata
International Journal of Environmental Research and Public Health 16 5097 2019.12
Language：English Publishing type：Research paper (scientific journal)
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Estimation of heat-related morbidity from weather data: A computational study in three prefectures of Japan over 2013–2018 Reviewed
S. Kodera, T. Nishimura, E. Rashed, K. Hasegawa, I. Takeuchi, R. Egawa, H. Sasaki, and A. Hirata
Environment International 130 104907 2019.09
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Permissible SA and Radiant Exposure for Brief Exposure in GHz Region
Sachiko Kodera, Akimasa Hirata
EMC Europe 2019 - 2019 International Symposium on Electromagnetic Compatibility 1020 - 1024 2019.09
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Institute of Electrical and Electronics Engineers Inc.
The specific absorption rate (SAR) averaged over 10 g of tissue is used as a physical quantity to prevent local temperature elevation in the international guidelines for constant exposure to radio-frequency electromagnetic fields. The averaging time of SAR is set to 6 min for local exposure. The ICNIRP public consultation document introduced a new physical quantity, absorbed power density (APD), as the basic restriction above 6 GHz. In addition, the limit for the specific absorption (SA) and absorbed energy density (AED) were set to avoid heating for brief exposures (shorter than the averaging time of 6 min). If all the energy for the averaging time of 6 min for continuous wave are concentrated into short duration and multiple pulse exposures, the local temperature elevation for the pulse(s) may exceeds that of exposure at almost constant exposure although it satisfies the limit for the SAR/APD. The purpose of this study is to determine how best to set the metric in order to limit temperature rise from brief exposures. We first confirmed that the peak temperature elevation for brief pulse exceeds the steady-state temperature for continuous exposure. We then proposed the limit energy density from the regression curve depending on the exposure duration of brief-pulse(s). The time course of temperature elevation in the multi-layer cube model was computed for typical scenarios of multiple pulses exposures. The SA and AED based on the regression curve can be used as a metric to prevent excess temperature elevation for different brief exposure scenario.
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5G communications systems and radiofrequency exposure limits Invited International coauthorship
K. R. Foster, S. Kodera, and A. Hirata
IEEE Future Networks Tech Focus 3 ( 2 ) 2019.09
Language：English Publishing type：Research paper (scientific journal)
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Different thermoregulatory responses of people from tropical and temperate zones: A computational study Reviewed
T. Kamiya, S. Kodera, K. Hasegawa, R. Egawa, H. Sasaki, and A. Hirata
Building and Environment 159 106152 2019.07
Language：English Publishing type：Research paper (scientific journal)
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Setting exposure guidelines and product safety standards for radio-frequency exposure at frequencies above 6 GHz: brief review Invited Reviewed
A. Hirata, D. Funahashi, and S. Kodera
Annals of Telecommunications 74 17 - 24 2019.01
Language：English Publishing type：Research paper (scientific journal)
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Area-averaged transmitted power density at skin surface as metric to estimate surface temperature elevation Reviewed International coauthorship
D. Funahashi, A. Hirata, S. Kodera, and K. R. Foster
IEEE Acccess 6 77665 - 77674 2018.11
Language：English Publishing type：Research paper (scientific journal)
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Temperature rise for brief radio-frequency exposure below 6 GHz Reviewed International coauthorship
S. Kodera, A. Hirata, D. Funahashi, S. Watanabe, K. Jokela, and R. J. Croft
IEEE Acccess 6 65737 - 65746 2018.10
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
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Comparison of thermal response for RF exposure in human and rat models Reviewed
S. Kodera and A. Hirata
International Journal of Environmental Research and Public Health 15 ( 10 ) 2320 2018.10
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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Risk evaluation of heat stroke with multiphysics computation and its application Invited Reviewed International coauthorship
A. Hirata, K. Hasegawa, S. Kodera, I. Laakso, R. Egawa, Y. Horie, N. Yazaki, K. Taguchi, T. Kashiwa
The Institute of Electtrical Enginieers of Japan 138 ( 6 ) 288 - 294 2018.06
Language：Japanese Publishing type：Research paper (scientific journal)
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Risk management of heatstroke based on fast computation of temperature and water loss using weather data for exposure to ambient heat and solar radiation Reviewed International coauthorship
K. Kojima, A. Hirata, K. Hasegawa, S. Kodera, I. Laakso, D. Sasaki, T. Yamashita, R. Egawa, Y. Horie, N. Yazaki, S. Kowata, K. Taguchi, and T, Kashiwa
IEEE Acccess 6 3774 - 3785 2018.01
Language：English Publishing type：Research paper (scientific journal)
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Temperature elevation in the human brain and skin with thermoregulation during exposure to RF energy Reviewed International coauthorship
S. Kodera, J. Gomez-Tames, and A. Hirata
BioMedical Engineering OnLine 17 ( 1 ) 1 - 17 2018.01
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal)
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太陽光および暑熱同時ばく露に対する熱中症リスク評価シミュレータの開発 Reviewed
西尾渉, 小寺紗千子, 平田晃正, 佐々木大輔, 山下毅, 江川隆輔, 小林広明, 曽根秀昭
電子情報通信学会論文誌C J100-C ( 5 ) 208 - 216 2017.05
Language：Japanese Publishing type：Research paper (scientific journal)
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ラット脳局所ばく露マルチフィジクス解析の高精度化 Reviewed
小寺紗千子, 森本涼太, 平田晃正, 増田宏, 有馬卓司, 渡辺聡一
電子情報通信学会論文誌C J100-C ( 5 ) 200 - 207 2017.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Accurate Multi-physics Analysis of Temperature Elevation in Rat Brain for Localized Microwave Exposure Reviewed
S. Kodera, R. Morimoto, A. Hirata, H. Masuda, T. Arima, S. Watanabe
J100-C ( 5 ) 200 - 207 2017.05
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
