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NAGATANI, Yoshiki
Associate Professor at Kobe City College of Technology, Japan (Department of Electronics) [map]
Ph.D. (Engineering)
e-mail: e-mail
Visiting Researcher, The National Institute of Advanced Industrial Science and Technology (AIST)
Researcher, Doshisha University Wave Electronics Research Center

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Movie & Demo of FDTD Method (Simulation of Wave Propagation)

Lena Sample (JavaScript)
Movies and Demo programs of FDTD simulation are available here.
You can feel the sound propagation in your web browser.

Works (Publications and Patent)

Ultrasound Propagation in Bone (for osteoporosis diagnosis)
Simulation Result (a) Simulation Result (b)
Examples of 3-D acoustic simulation in cancellous bone. Focused ultrasound is transmitted from bottom area of the images.
Hirofumi Taki, Yoshiki Nagatani, Mami Matsukawa, Hiroshi Kanai, and Shin-ichi Izumi, "Fast decomposition of two ultrasound longitudinal waves in cancellous bone using a phase rotation parameter for bone quality assessment: Simulation study," The Journal of the Acoustical Society of America, Vol.142, No.4 (2017) pp. 2322-2331.
Peer Reviewed [→LINK]
Yoshiki Nagatani, Séraphin Guipieri, Vu-Hieu Nguyen, Christine Chappard, Didier Geiger, Salah Naili, Guillaume Haїat, "Three-dimensional Simulation of Quantitative Ultrasound in Cancellous Bone using the Echographic Response of a Metallic Pin," Ultrasonic Imaging, Vol.39, No.5 (2017) pp.295-312.
Peer Reviewed [→LINK]
Toshiho Hata, Yoshiki Nagatani, Koki Takano, and Mami Matsukawa, "Simulation study of axial ultrasonic wave propagation in heterogeneous bovine cortical bone," The Journal of the Acoustical Society of America, Vol.140, No.5 (2016) pp. 3710-3717.
Peer Reviewed [→LINK]
Séraphin Guipieri, Yoshiki Nagatani, Romain Bosc, Vu-Hieu Nguyen, Christine Chappard, Didier Geiger, and Guillaume Haïat, "Ultrasound Speed of Sound Measurements in Trabecular Bone Using the Echographic Response of a Metallic Pin," Ultrasound in Medicine and Biology, Vol. 41 (2015) pp. 2966-2976.
Peer Reviewed [→LINK]
Hirofumi Taki, Yoshiki Nagatani, Mami Matsukawa, Katsunori Mizuno, and Toru Sato, "Fast characterization of two ultrasound longitudinal waves in cancellous bone using an adaptive beamforming technique," The Journal of the Acoustical Society of America, Vol. 137 (2015) pp. 1683-1692.
Peer Reviewed [→LINK]
Shigeaki Okumura, Aya Kita, Hirofumi Taki, Yoshiki Nagatani, Mami Matsukawa, and Toru Sato, "Application of spatial domain interferometry with the Capon method to transcranial Doppler ultrasonography: a simulation study," Advanced Biomedical Engineering, Vol. 4 (2015) pp. 73-79.
Peer Reviewed [→LINK]
Keith Wear, Yoshiki Nagatani, Katsunori Mizuno, and Mami Matsukawa, "Fast and slow wave detection in bovine cancellous bone in vitro using bandlimited deconvolution and Prony's method," The Journal of the Acoustical Society of America, Vol. 136 (2014) pp. 2015-2024.
Peer Reviewed [→LINK]
Isao Mano, Kaoru Horii, Fuminori Fujita, Yoshiki Nagatani, Mami Matsukawa, and Takahiko Otani, "Influence of the Circumferential Wave on the Fast and Slow Wave Propagation in Small Distal Radius Bone," Japanese Journal of Applied Physics, Vol. 53 (2014) 07KF07.
Peer Reviewed [→LINK (PDF: Free)]
Yoshiki Nagatani and Ryosuke O. Tachibana, "Multichannel Instantaneous Frequency Analysis of Ultrasound Propagating in Cancellous Bone," The Journal of the Acoustical Society of America, Vol.135, No.3 (2014) pp. 1197-1206.
Peer Reviewed [→LINK]
Yoshiki Nagatani, Katsunori Mizuno, and Mami Matsukawa, "Two-wave behavior under various conditions of transition area from cancellous bone to cortical bone," Ultrasonics 54 (2014) pp. 1245-1250.
Peer Reviewed [→LINK]
Atsushi Hosokawa and Yoshiki Nagatani, "Effect of Cortical Bone Layer on Fast and Slow Waves in Cancellous Bone: Investigations Using Stratified Models," Japanese Journal of Applied Physics, Vol.51 (2012) pp. 07GF19-1-5.
Peer Reviewed [→LINK]
Amber Nelson, Joseph Hoffman, Christian Anderson, Mark Holland, Yoshiki Nagatani, Katsunori Mizuno, Mami Matsukawa, and James Miller, "Determining attenuation properties of interfering fast and slow ultrasonic waves in cancellous bone," Journal of the Acoustical Society of America, Vol.130, No.4 (2011) pp. 2233-2240.
Peer Reviewed [→LINK]
Katsunori Mizuno, Yoshiki Nagatani, Keisuke Yamashita, and Mami Matsukawa, "Propagation of two longitudinal waves in a cancellous bone with the closed pore boundary," Journal of the Acoustical Society of America, Vol.130 (2011) EL122-127.
Peer Reviewed [→LINK (PDF: Free)]
Katsunori Mizuno, Keisuke Yamashita, Yoshiki Nagatani and Mami Matsukawa, "Effect of boundary condition on the two wave propagation in cancellous bone," Japanese Journal of Applied Physics, Vol.50 (2011) 07HF19-1-5.
Peer Reviewed [→LINK]
Sho HASEGAWA, Yoshiki NAGATANI, Katsunori MIZUNO, and Mami MATSUKAWA, "Wavelet Transform Analysis of Ultrasonic Wave Propagation in Cancellous Bone," Japanese Journal of Applied Physics, Vol.49 (2010) 07HF28.
Peer Reviewed [→LINK].
Yoshiki NAGATANI, Katsunori MIZUNO, Takashi SAEKI, Mami MATSUKAWA, Takefumi SAKAGUCHI, and Hiroshi HOSOI, "Propagation of Fast and Slow Waves in Cancellous Bone: Comparative Study of Simulation and Experiment," Acoustical Science and Technology, Vol.30, No.4 (2009) pp. 257-264.
Peer Reviewed [→LINK (PDF: Free)]
Yoshiki NAGATANI, Katsunori MIZUNO, Takashi SAEKI, Mami MATSUKAWA, Takefumi SAKAGUCHI, and Hiroshi HOSOI, "Numerical and Experimental Study on the Wave Attenuation in Bone - FDTD Simulation of Ultrasound Propagation in Cancellous Bone -," Ultrasonics, Vol.48 (2008) pp. 607-612.
Peer Reviewed [→LINK]
Yoshiki NAGATANI, Hirotaka IMAIZUMI, Takashi FUKUDA, Mami MATSUKAWA, Yoshiaki WATANABE, and Takahiko OTANI, "Applicability of FDTD method on the wave propagation in the cancellous bone," Japanese Journal of Applied Physics, Vol.45, No.9A (2006) pp. 7186-7190.
Peer Reviewed [→LINK]
Pascal Laugier, Guillaume Haiat (Eds.) et al., "Bone Quantitative Ultrasound," Springer (ISBN: 978-94-007-0016-1) (2010) Chap. 11.
Biblio [→LINK] [→Kindle Edition]
Simulation of Sound Propagation in Human Body Model
Simulation Result (DEMOHB Male) Simulation Result (DEMOHB Female)
A quarter cycle of a sinusoidal wave was applied to the bottom of right heel assuming one step in walking movement of a person. A complexed propagation can be seen in the model.
Yoshiki Nagatani, Isao Mano, and Mami Matsukawa, "Estimation of Wave Propagation inside Human Body while Walking and Running - Measurement of Vibration on Body Surface and 3-D Simulation," Abstract Book of IEEE International Ultrasonic Symposium 2013 (2013) IUS1-PD4-1. Proceedings
Yoshiki Nagatani, "Long-Distance Propagation of Ultrasound in Human Body - Experimental and Numerical Study using 3-D Elastic Human Model," Proceedings of Symposium on Ultrasonic Electronics, Vol.33 (2012) pp.501-502. Proceedings
Yoshiki Nagatani and Masashi Saito, "Behaviour of Ultrasonic Wave Propagation in Human Body - Investigation of Experimental and Simulated Data using 3-D Elastic Human Model," Proceedings of Symposium on Ultrasonic Electronics, Vol.32 (2011) pp. 397-398. Proceedings
Yoshiki NAGATANI, Atsushi HOSOKAWA, Takefumi SAKAGUCHI, Mami MATSUKAWA, and Yoshiaki WATANABE, "Introduction of “Digital Elastic Model of Human Body” for 3-D FDTD Simulation - Elastic Wave Propagation in Human Body -"," Proceedings of Symposium on Ultrasonic Electronics, Vol.29 (2008) pp. 471-472.
Proceedings [→LINK]
Simulation Technique
64GB
The PC we use has 64GB of memory in order to build huge model for simulation.
Masahiro Toyoda (ed.), "Acoustic Field Visualization by the FDTD Method (The Acoustical Society of Japan)" (Corona Publishing, Japan, 2015) (ISBN: 978-4-339-01334-4)
Biblio [→LINK] [in Japanese]
Yoshiki NAGATANI, Takefumi SAKAGUCHI, and Hiroshi HOSOI, "FDTD Simulation Considering Viscous Damping with Frequency Dispersion - An Approach of RAM-Saving Algorithm -," Proceedings of Symposium on Ultrasonics Electronics, Vol.28 (2007) pp. 403-404.
Proceedings
Yasuto HARA, Shin-ishi SAKAMOTO, Yoshiki NAGATANI, and Yoshiaki WATANABE, "Acoustic finite-difference time-domain simulation considering the fluctuation of sound pressure caused by heat energy : Wave propagation in a narrow tube with temperature gradient," The Journal of the Acoustical Society of Japan, Vol.63, No.12 (2007) pp. 701-707.
Peer Reviewed [→LINK] [Article in Japanese, Abstract in English]
Speech and Hearing
BCUHA
Prototype of the newly-developed hearing aid using ultrasound by Nakagawa et al.(AIST). No surgery is required for the use of ultrasound hearing aid device.
Tadao Okayasu, Tadashi Nishimura, Seiji Nakagawa, Akinori Yamashita, Yoshiki Nagatani, Yuka Uratani, Toshiaki Yamanaka, and Hiroshi Hosoi, "Evaluation of prosodic and segmental change in speech-modulated bone-conducted ultrasound by mismatch fields," Neuroscience Letters, Vol.559 (2014) pp. 117-121.
Peer Reviewed [→LINK]
Tadao Okayasu, Tadashi Nishimura, Akinori Yamashita, Seiji Nakagawa, Yoshiki Nagatani, Shuichi Yanai, Yuka Uratani, and Hiroshi Hosoi, "Duration-dependent growth of N1m for speech-modulated bone-conducted ultrasound," Neuroscience Letters, Vol.495 (2011) pp. 72-76.
Peer Reviewed [→LINK]
Akinori YAMASHITA, Tadashi NISHIMURA, Yoshiki NAGATANI, Takefumi SAKAGUCHI, Tadao OKAYASU, Shuichi YANAI, and Hiroshi HOSOI, "The effect of visual information in speech signals by bone-conducted ultrasound," NeuroReport, Vol.21(2) (2010) pp. 119-122.
Peer Reviewed [→LINK]
Akinori YAMASHITA, Tadashi NISHIMURA, Yoshiki NAGATANI, Tadao OKAYASU, Toshizo KOIZUMI, Takefumi SAKAGUCHI, and Hiroshi HOSOI, "Comparison between Bone-Conducted Ultrasound and Audible Sound in Speech Recognition," Acta Oto-Laryngologica, Vol.129, No.s562 (2009) pp. 34-39.
Peer Reviewed [→LINK]
Yoshiki NAGATANI, Ryosuke TACHIBANA, Takefumi SAKAGUCHI, and Hiroshi HOSOI, "Loudness calibration of monosyllabic speech sounds in FW03, " The Journal of the Acoustical Society of Japan, Vol.64, No.11 (2008) pp. 647-649.
Peer Reviewed [→LINK] [Article in Japanese, Abstract in English]
Yoshiki Nagatani, Takefumi Sakaguchi, and Hiroshi Hosoi, "Evaluation of acoustic environments using deteriorated speech sound," Acoustics'08 - Proceedings (2008) pp. 1249-1253.
Proceedings [→LINK]
(Japanese Patent No.5032880 (Sep. 26th, 2012))
misc...
Ryosuke Miura, Yasunari Ando, Yasuhisa Hotta, Yoshiki Nagatani, and Akihiko Tsuda, "Acoustic Alignment of a Supramolecular Nanofiber in Harmony with the Sound of Music," ChemPlusChem, Vol.79(4) (2014) pp. 516-523.
Peer Reviewed [→LINK]
Akihiko Tsuda, Yuka Nagamine, Reiko Watanabe, Yoshiki Nagatani, Noriyuki Ishii, and Takuzo Aida, "Spectroscopic visualization of sound-induced liquid vibrations using a supramolecular nanofibre," Nature Chemistry, Vol.2 (2010) pp.977-983.
Peer Reviewed [→LINK]

Please feel free to contact me for reprints and/or questions.
e-mail: e-mail