Updated on 2025/10/09

写真a

 
CHOI Samuel
 
Organization
Academic Assembly Institute of Science and Technology JOUHOU DENSHI KOUGAKU KEIRETU Associate Professor
Graduate School of Science and Technology Electrical and Information Engineering Associate Professor
Faculty of Engineering Department of Engineering Associate Professor
Title
Associate Professor
Other name(s)
「崔」は「チェ」,「サイ」または「チョエ」と読みます
External link

Degree

  • Doctor (Engineering) ( 2007.9   Tokyo University of Agriculture and Technology )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering  / Interferometry; OCT; Frequency comb;

Research History (researchmap)

  • Niigata University   Faculty of Engineering   Associate Professor

    2020.1

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  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Assistant Professor

    2009.6 - 2019.12

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  • Tokyo University of Agriculture and Technology   Special researcher of the Japan Society for the Promotion of Science

    2007.10 - 2009.5

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Assistant Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Assistant Professor

    2010.4

  • Niigata University   Graduate School of Science and Technology Electrical and Information Engineering   Assistant Professor

    2010.4

  • Niigata University   Abolition organization Communication Systems   Assistant Professor

    2009.6 - 2017.3

Education

  • Tokyo University of Agriculture and Technology   Graduate School, Division of Engineering   電気電子工学

    - 2007.9

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    Country： Japan

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  • Tohoku University   Graduate School, Division of Engineering   電気・通信工学

    - 2004.3

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    Country： Japan

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  • Tohoku University   Faculty of Engineering   Department of Electrical and Communication Engineering

    - 2002.3

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    Country： Japan

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Committee Memberships

  • 日本光学会   学会誌「光学」編集委員  

    2017.4   

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    Committee type：Academic society

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  • 光波センシング技術研究会   常任幹事  

    2015.4   

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    Committee type：Academic society

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Papers

  • The cochlear hook region detects harmonics beyond the canonical hearing range Reviewed

    Kazuhiro Horii, Bakushi Ogawa, Noriko Nagase, Iori Morimoto, Chikara Abe, Takenori Ogawa, Samuel Choi, Fumiaki Nin

    PNAS Nexus   2024.7

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    Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    Abstract

    Ultrasound, or sound at frequencies exceeding the conventional range of human hearing, is not only audible to mice, microbats, and dolphins, but also creates an auditory sensation when delivered through bone conduction in humans. Although ultrasound is utilized for brain activation and in hearing aids, the physiological mechanism of ultrasonic hearing remains unknown. In guinea pigs, we found that ultrasound above the hearing range delivered through ossicles of the middle ear evokes an auditory brainstem response and a mechano-electrical transduction current through hair cells, as shown by the local field potential called the cochlear microphonic potential (CM). The CM synchronizes with ultrasound, and like the response to audible sounds is actively and nonlinearly amplified. In vivo optical nano-vibration analysis revealed that the sensory epithelium in the hook region, the basal extreme of the cochlear turns, resonates in response both to ultrasound within the hearing range and to harmonics beyond the hearing range. The results indicate that hair cells can respond to stimulation at the optimal frequency and its harmonics, and the hook region detects ultrasound stimuli with frequencies more than two octaves higher than the upper limit of the ordinary hearing range.

    DOI： 10.1093/pnasnexus/pgae280

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  • Generation of stochastic electromagnetic beams based on modified degenerate cavity lasers

    Pu, H., Sasaki, O., Suzuki, T., Choi, S., Ji, X.

    Scientific Reports   14 ( 1 )   2024

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1038/s41598-024-68664-5

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  • Phase refractive index measurement of thick glass plates with a spectrally resolved interferometer

    Kaining Zhang, Osami Sasaki, Songjie Luo, Samuel Choi, Takamasa Suzuki, Jixiong Pu

    Optics Continuum   2 ( 3 )   683 - 683   2023.3

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    Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    Measurements of phase refractive indexes of thick objects by using fitting method have been reported in many papers, but the fitting method produces errors in the fitted coefficients of a fitting function. In this paper it is made clear that the thickness of object, for which the phase refractive index can be measured exactly, is limited by the errors. Phase refractive indexes of three kinds of glass plates of 1 mm thickness are measured directly from spectral phases detected with a spectrally resolved interferometer. Instead of using the fitting method, the 2π phase ambiguity contained in a detected spectral phase is determined by using an assumption that an actual refractive index measured in experiment is almost the same as well-known data of the refractive index. The actual refractive indexes measured with an error less than 8 × 10<sup>−5</sup> are slightly different from the well-known data about the slope and the constant value in the distributions.

    DOI： 10.1364/optcon.482318

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  • Linear-wavenumber swept source based on an acousto-optic device for optical coherence tomography

    Ji, X., Suzuki, T., Choi, S., Sasaki, O., Pu, J.

    Optics Express   31 ( 26 )   2023

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OE.509217

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  • Measurements of phase distributions of optical vortices based on the sinusoidal phase modulation method

    Haosen Pu, Osami Sasaki, Takamasa Suzuki, Samuel Choi

    Optics Continuum   1 ( 11 )   2287 - 2287   2022.10

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    Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    Vortex beams (VBs), a type of light beam with a spiral wavefront, have unique properties, such as the orbit angular momentum (OAM), and diverse applications in optical communications and optical trapping and tweezers. Therefore, accurate measurements and estimations of the phase distribution and topological charge are essential for their applications to ensure VB quality. In this paper, we employed a sinusoidal phase modulation (SPM) interferometry to measure the phase distributions of VBs and the topological charge of VBs were estimated by mean of a method of the process of unwrapped phase. The phase measurement of optical vortices generated by a spatial light modulator (SLM) demonstrated that the SPM interferometry-based technique had a high measurement accuracy with a simplified configuration. The estimation errors of the topological charges for various orders of VBs were within approximately 4%. The fluctuation in the surface of the SLM leading to the flatness of the wavefront was estimated to be 0.06 rad by 10 consecutive measurements

    DOI： 10.1364/optcon.473876

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  • Sparsity-Aware OCT Volumetric Data Restoration Using Optical Synthesis Model Reviewed

    Ruiki Kobayashi, Genki Fujii, Yuta Yoshida, Takeru Ota, Fumiaki Nin, Hiroshi Hibino, Samuel Choi, Shunsuke Ono, Shogo Muramatsu

    IEEE Transactions on Computational Imaging   8   505 - 520   2022.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1109/TCI.2022.3183396

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    Other Link： https://dblp.uni-trier.de/db/journals/tci/tci8.html#KobayashiFYONHC22

  • External-cavity laser diode using acousto-optic deflector as tunable grating

    Takamasa Suzuki, Yuzuki Kaneko, Samuel Choi, Osami Sasaki

    Optics Letters   47 ( 7 )   1871 - 1871   2022.3

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    Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    In this study, a novel, to the best of our knowledge, external-cavity laser diode (ECLD) without a diffraction grating is proposed and demonstrated. In the proposed configuration, an acousto-optic deflector (AOD) acts not only as a deflector but also as a diffraction grating. Thus, the AOD functions as a wavelength-selective device, which helps improve the overall performance of the ECLD. In fact, the proposed configuration realizes a wide range of wavelength scanning with a simple configuration, highly efficient optical feedback, and a steady optical resonator with a constant cavity length. We confirm that the wavelengths scanned with the proposed ECLD agree well with theoretical calculations. The scanning range and maximum frequency response reached approximately 60 nm and 50 kHz, respectively. Moreover, reproducible measurements of the three-dimensional thickness distribution of a thin glass plate indicates that the proposed ECLD can be used for optical coherence tomography imaging systems.

    DOI： 10.1364/ol.454021

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  • Measurement of phase refractive index directly from phase distributions detected with a spectrally resolved interferometer

    Kaining Zhang, Osami Sasaki, Samuel Choi, Songjie Luo, Takamasa Suzuki, Jixiong Pu

    Applied Optics   60 ( 31 )   10009 - 10009   2021.11

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    Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    A phase refractive index is measured directly from an unwrapped spectral phase distribution whose ambiguity is determined by fitting the spectral phase distribution with functions based on Cauchy’s equation. The phase refractive index of a quartz glass with 20 µm thickness is measured exactly from three spectral phase distributions detected in two different configurations of a spectrally resolved interferometer. Since there is a high possibility that the ambiguity cannot be correctly determined when there is a large difference between a function of the real refractive index and Cauchy’s equation, characteristics of the fitting are examined.

    DOI： 10.1364/ao.438267

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  • Optical coherence tomography using nonstationary signal processing based on continuous wavelet transform

    Takamasa Suzuki, Jiro Shimazaki, Osami Sasaki, Samuel Choi

    Twelfth International Conference on Information Optics and Photonics   2021.11

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    Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2606987

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  • Author Correction: Computer modeling defines the system driving a constant current crucial for homeostasis in the mammalian cochlea by integrating unique ion transports. International journal

    Fumiaki Nin, Takamasa Yoshida, Shingo Murakami, Genki Ogata, Satoru Uetsuka, Samuel Choi, Katsumi Doi, Seishiro Sawamura, Hidenori Inohara, Shizuo Komune, Yoshihisa Kurachi, Hiroshi Hibino

    NPJ systems biology and applications   7 ( 1 )   39 - 39   2021.10

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  • Large thickness measurement of glass plates with a spectrally resolved interferometer using two positions of a reference surface and a compensation glass

    Kaining Zhang, Samuel Choi, Osami Sasaki, Songjie Luo, Takamasa Suzuki, Jixiong Pu

    Optical Metrology and Inspection for Industrial Applications VIII   2021.10

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    Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2601233

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  • Shape measurement of large thickness glass plates with a white-light scanning interferometer using a compensation glass and a fixed reference surface

    Kaining Zhang, Samuel Choi, Osami Sasaki, Songjie Luo, Takamasa Suzuki, Yongxin Liu, Jixiong Pu

    Engineering Research Express   3 ( 2 )   025044 - 025044   2021.6

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    Publishing type：Research paper (scientific journal)   Publisher：IOP Publishing  

    DOI： 10.1088/2631-8695/ac09d8

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    Other Link： https://iopscience.iop.org/article/10.1088/2631-8695/ac09d8/pdf

  • Large thickness measurement of glass plates with a spectrally resolved interferometer using variable signal positions

    Kaining Zhang, Samuel Choi, Osami Sasaki, Songjie Luo, Takamasa Suzuki, Yongxin Liu, Jixiong Pu

    OSA Continuum   4 ( 6 )   1792 - 1792   2021.5

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    Publishing type：Research paper (scientific journal)   Publisher：Optica Publishing Group  

    In order to measure exactly a large thickness of glass plate with a spectrally resolved interferometer using a spectral analyzer with a low resolution of 0.5 nm and a supercontinuum light source with a large bandwidth of about 300 nm, a new measurement method with a spectrally resolved interferometer is proposed where a variable signal position is generated by moving a reference surface with a piezoelectric stage. It is made clear how to decide the signal position by analyzing amplitude distribution of Fourier transform of the interference signal. Through four-step measurement by using four different optical configurations with four different signal positions the thickness of glass plate can be obtained from a slope of a spectral phase distribution which does not contain the refractive index of glass plate. A small measurement error of 50 nm is achieved in measuring 1 mm thickness of a glass plate.

    DOI： 10.1364/osac.417141

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  • Rapid optical tomographic vibrometry using a swept multi-gigahertz comb Reviewed International journal

    Samuel Choi, Takeru Ota, Fumiaki Nin, Tatsutoshi Shioda, Takamasa Suzuki, Hiroshi Hibino

    Optics Express   29 ( 11 )   16749 - 16749   2021.5

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    Authorship：Lead author,　Last author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：The Optical Society  

    DOI： 10.1364/oe.425972

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  • Shape measurement of a thin glass plate through analyzing dispersion effects in a white-light scanning interferometer

    Songjie Luo, Osami Sasaki, Samuel Choi, Takamasa Suzuki, Ziyang Chen, Jixiong Pu

    Optics and Lasers in Engineering   139   2021.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier Ltd  

    DOI： 10.1016/j.optlaseng.2020.106505

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  • Optimization of spectral-domain optical coherence tomography with a supercontinuum source for in vivo motion detection of low reflective outer hair cells in guinea pig cochleae

    Fumiaki Nin, Samuel Choi, Takeru Ota, Zhang Qi, Hiroshi Hibino

    Optical Review   28 ( 2 )   239 - 254   2021.4

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    Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    <title>Abstract</title>Sound evokes sub-nanoscale vibration within the sensory epithelium. The epithelium contains not only immotile cells but also contractile outer hair cells (OHCs) that actively shrink and elongate synchronously with the sound. However, the in vivo motion of OHCs has remained undetermined. The aim of this work is to perform high-resolution and -accuracy vibrometry in live guinea pigs with an SC-introduced spectral-domain optical coherence tomography system (SD-OCT). In this study, to reveal the effective contribution of SC source in the recording of the low reflective materials with the short total acquisition time, we compare the performances of the SC-introduced SD-OCT (SCSD-OCT) to that of the conventional SD-OCT. As inanimate comparison objects, we record a mirror, a piezo actuator, and glass windows. For the measurements in biological materials, we use in/ex vivo guinea pig cochleae. Our study achieved the optimization of a SD-OCT system for high-resolution in vivo vibrometry in the cochlear sensory epithelium, termed the organ of Corti, in mammalian cochlea. By introducing a supercontinuum (SC) light source and reducing the total acquisition time, we improve the axial resolution and overcome the difficulty in recording the low reflective material in the presence of biological noise. The high power of the SC source enables the system to achieve a spatial resolution of 1.72 ± 0.00 μm on a mirror and reducing the total acquisition time contributes to the high spatial accuracy of sub-nanoscale vibrometry. Our findings reveal the vibrations at the apical/basal region of OHCs and the extracellular matrix, basilar membrane.

    DOI： 10.1007/s10043-021-00654-8

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    Other Link： https://link.springer.com/article/10.1007/s10043-021-00654-8/fulltext.html

  • Characterisation of the static offset in the travelling wave in the cochlear basal turn Reviewed

    Takeru Ota, Fumiaki Nin, Samuel Choi, Shogo Muramatsu, Seishiro Sawamura, Genki Ogata, Mitsuo P. Sato, Katsumi Doi, Kentaro Doi, Tetsuro Tsuji, Satoyuki Kawano, Tobias Reichenbach, Hiroshi Hibino

    PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY   2020.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s00424-020-02373-6

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  • Vibration distribution measurement using downsampling phase-shifting interferometer

    Yuta Ohara, Takamasa Suzuki, Samuel Choi, Osami Sasaki

    Optical Engineering   59 ( 3 )   2020.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPIE  

    DOI： 10.1117/1.OE.59.3.034112

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  • An offset component associated with the activity of outer hair cells in the cochlear travelling wave Reviewed

    Takeru Ota, Fumiaki Nin, Samuel Choi, Shogo Muramatsu, Seishiro Sawamura, Genki Ogata, Mitsuo P. Sato, Katsumi Doi, Kentaro Doi, Tetsuro Tsuji, Satoyuki Kawano, Tobias Reichenbach, Hiroshi Hibino

    Pflügers Archiv - European Journal of Physiology   2020

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  • In vivo nano-scale vibrometry in apical-basal ends of contractile outer hair cells in the mammalian cochlea by supercontinuum source spectral-domain OCT

    Fumiaki Nin, Samuel Choi, Takeru Ota, Hiroshi Hibino

    Progress in Biomedical Optics and Imaging - Proceedings of SPIE   11239   2020

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2539303

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  • Multifrequency-swept optical coherence microscopy for full-field in-vivo intracochlear vibration measurement

    Samuel Choi, Fumiaki Nin, Takeru Ota, Hiroshi Hibino

    Progress in Biomedical Optics and Imaging - Proceedings of SPIE   11228   2020

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2545362

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  • Acousto-optically tuned external-cavity laser diode for optical coherence tomography with continuous wavelet transform

    Takamasa Suzuki, Nariyasu Sugawara, Samuel Choi, Osami Sasaki

    Optical Engineering   58 ( 10 )   2019.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：SPIE  

    DOI： 10.1117/1.OE.58.10.104108

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  • OCT Volumetric Data Restoration with Latent Distribution of Refractive Index Reviewed

    Genki Fujii, Yuta Yoshida, Shogo Muramatsu, Shunsuke Ono, Samuel Choi, Takeru Ota, Fumiaki Nin, Hiroshi Hibino

    Proc. of 2019 IEEE International Conference on Image Processing (ICIP)   764 - 768   2019.9

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：IEEE  

    DOI： 10.1109/ICIP.2019.8803737

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    Other Link： https://dblp.uni-trier.de/db/conf/icip/icip2019.html#FujiiYMOCONH19

  • In vivo tomographic visualization of intracochlear vibration using a supercontinuum multifrequency-swept optical coherence microscope Reviewed

    Choi, S., Nin, F., Ota, T., Sato, K., Muramatsu, S., Hibino, H.

    Biomedical Optics Express   10 ( 7 )   3317 - 3342   2019.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/BOE.10.003317

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  • Intracochlear vibration measurement using supercontinuum multifrequency-swept optical coherence microscope

    Samuel Choi, Fumiaki Nin, Takeru Ota, Hiroshi Hibino

    Optical Design and Fabrication 2019   2019.6

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  • In-vivo tomographic visualization of intracochlear vibration using supercontinuum multifrequency-swept optical coherence microscope Invited

    Samuel Choi, Fumiaki Nin, Takeru Ota, Hiroshi Hibino

    The 8th Advanced Lasers and Photon Source, OPTICS & PHOTONICS International Congress 2019   2019.4

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  • Signal correction by detection of scanning position in a white-light interferometer for exact surface profile measurement Reviewed

    Luo, S., Suzuki, T., Sasaki, O., Choi, S., Chen, Z., Pu, J.

    Applied Optics   58 ( 13 )   3544 - 3558   2019.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/AO.58.003548

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  • Detection of an atypical motion in cochlear sensory epithelium. Oral presentation: “Symposium 8: Biophysical mechanisms underlying nano-vibrations of the sensory epithelium in hearing organs”

    Ota T, Nin F, Choi S, Hibino H

    9th Federation of the Asian and Oceanian Physiological Societies Congress in conjunction with The 96th Annual Meeting of the Physiological Society of Japan   2019.3

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  • 聴覚の特徴に資する内耳感覚上皮帯のナノ振動の同定 解剖学会-生理学会 連携シンポジウム：「内耳蝸牛・聴覚伝導路に置ける音信号伝達・処理メカニズムの形態学的・生理学的基盤」

    太田 岳, 任 書晃, 崔 森悦, 日比野 浩

    第124回日本解剖学会総会全国学術集会   2019.3

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  • 内耳の感覚上皮帯に生じるナノ振動の抽出とその調節機構の検討

    太田 岳, 任 書晃, 崔 森悦, 日比野 浩

    第92回日本薬理学会年会   2019.3

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  • 先端的イメージング振動計測装置による内耳感覚上皮帯ナノ振動の平面分布

    崔 森悦, 任 書晃, 太田 岳, 日比野 浩

    第92回日本薬理学会年会   2019.3

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  • 改良型イメージング振動計測装置による内耳感覚上皮帯ナノ振動の深度分布

    任 書晃, 太田 岳, 崔 森悦, 日比野 浩

    第92回日本薬理学会年会   2019.3

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  • 聴覚の特徴に資する内耳感覚上皮帯のナノ振動の同定 Reviewed

    太田 岳, 任 書晃, 崔 森悦, 日比野 浩

    第124回日本解剖学会総会全国学術集会、解剖学会-生理学会 連携シンポジウム   2019.3

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  • Analysis of nanoscale vibrations in the inner ear by advanced vibrometries

    Hibino H, Ota T, Choi S, Nin F

    Symposium 79: Mechanomedicine” in 9th Federation of the Asian and Oceanian Physiological Societies Congress in conjunction with The 96th Annual Meeting of the Physiological Society of Japan   2019.3

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  • An imaging system for 3D detection of nano-vibrations in sensory epithelium of the inner ear Reviewed

    Nin F, Choi S, Ota T, Hibino H

    9th FAOPS Federation of the Asian and Oceanian Physiological Societies Congress   2019.3

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  • 内耳の感覚上皮ナノ振動の３次元計測を志向した光干渉顕微鏡の創製

    任 書晃, 崔 森悦, 太田 岳, 日比野 浩

    第65回中部日本生理学会   2019.2

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  • Full-field optical coherence tomography with an acousto-optically tuned external-cavity laser diode

    Takamasa Suzuki, Nariyasu Sugawara, Samuel Choi

    Proceedings of SPIE - The International Society for Optical Engineering   11209   2019

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：SPIE  

    DOI： 10.1117/12.2547786

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  • 3D thickness measurement using pulse-driven optical coherence tomography based on wavelet transform

    Takamasa Suzuki, Bin Liu, Samuel Choi

    Proceedings of SPIE - The International Society for Optical Engineering   11102   2019

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    DOI： 10.1117/12.2534005

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  • 感覚上皮帯の非典型な動きの同定と分析

    太田 岳, 任 書晃, 崔 森悦, 日比野 浩

    第65回中部日本生理学会   2018.11

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  • 内耳の感覚上皮ナノ振動の３次元計測を志向した新規光干渉顕微鏡の創製

    任 書晃, 崔 森悦, 太田 岳, 日比野 浩

    第28回日本耳科学会総会・学術講演会   2018.10

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  • 改良型レーザ干渉計による内耳蝸牛の感覚上皮帯ナノ振動測定

    太田 岳, 崔 森悦, 任 書晃, 日比野 浩

    第28回日本耳科学会総会・学術講演会   2018.10

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  • 改良型振動計による内耳ナノ振動の測定と解析 シンポジウム「分子から個体のメカノバイオ：多様な物理刺激とその応答」

    日比野 浩, 太田 岳, 崔 森悦, 任 書晃

    第56回日本生物物理学会年会   2018.9

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  • 階層的スパース正則化とハード制約を利用したOCTボリュームデータ復元の実データ検証

    藤井 元暉, 村松 正吾, 崔 森悦, 小野 峻佑, 太田 岳, 任 書晃, 日比野 浩

    電子情報通信学会信号処理研究会   2018.8

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  • 内耳の感覚上皮ナノ振動の３次元計測を志向した新規光干渉顕微鏡の創製

    崔 森悦, 任 書晃, 太田 岳, 日比野 浩

    第57回日本生体医工学会大会   2018.6

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  • 内耳のナノ振動計測を標的とした改良型レーザー干渉法の創出 口頭発表：第57回日本生体医工学会大会

    太田 岳, 崔 森悦, 任 書晃, 日比野 浩

    第57回日本生体医工学会大会   2018.6

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  • 階層的スパース正則化とハード制約を利用したOCTボリュームデータ復元の検討

    村松 正吾, 長 小野 峻佑, 太田 岳, 任 書晃, 日比野 浩

    電子情報通信学会信号処理研究会   2018.5

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  • OCT VOLUMETRIC DATA RESTORATION VIA PRIMAL-DUAL PLUG-AND-PLAY METHOD Reviewed

    Muramatsu S, Choi S, Ono S, Ota T, Nin F, Hibino H

    IEEE International Conference on Acoustics, Speech and Signal Processing   2018.4

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  • Exact surface profile measurement without subtracting dispersion phase through Fourier transform in a white-light scanning interferometer Reviewed

    Songjie Luo, Osami Sasaki, Ziyang Chen, Samuel Choi, Jixiong Pu

    Applied Optics   57 ( 4 )   894 - 899   2018.2

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    DOI： 10.1364/AO.57.000894

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  • Full-field optical coherence tomography using acousto-optically tuned external-cavity laser diode and wavelet transform

    Takamasa Suzuki, Gen Suda, Samuel Choi, Osami Sasaki

    Optics InfoBase Conference Papers   2018   2018

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    DOI： 10.1364/FIO.2018.FM3D.3

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  • Improvement of wavelength-scanning range in acousto-optically tuned external-cavity laser diode

    Nariyasu Sugawara, Takamasa Suzuki, Samuel Choi

    Optics InfoBase Conference Papers   2018   2018

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    DOI： 10.1364/OPJ.2018.31aAJ8

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  • Advanced signal processing in a white-light scanning interferometer for exact surface profile measurement

    Songjie Luo, Osami Sasaki, Samuel Choi, Takamasa Suzuki, Jixiong Pu

    Proceedings of SPIE - The International Society for Optical Engineering   10819   2018

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    DOI： 10.1117/12.2502790

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  • Hearing Loss Controlled by Optogenetic Stimulation of Nonexcitable Nonglial Cells in the Cochlea of the Inner Ear Reviewed

    Mitsuo P. Sato, Taiga Higuchi, Fumiaki Nin, Genki Ogata, Seishiro Sawamura, Takamasa Yoshida, Takeru Ota, Karin Hori, Shizuo Komune, Satoru Uetsuka, Samuel Choi, Masatsugu Masuda, Takahisa Watabe, Sho Kanzaki, Kaoru Ogawa, Hidenori Inohara, Shuichi Sakamoto, Hirohide Takebayashi, Katsumi Doi, Kenji F. Tanaka, Hiroshi Hibino

    FRONTIERS IN MOLECULAR NEUROSCIENCE   10   300   2017.9

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    DOI： 10.3389/fnmol.2017.00300

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  • 3-D surface profile measurement using spectral interferometry based on continuous wavelet transform Reviewed

    Takuma Serizawa, Takamasa Suzuki, Samuel Choi, Osami Sasaki

    OPTICS COMMUNICATIONS   396   216 - 220   2017.8

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    DOI： 10.1016/j.optcom.2017.03.053

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  • Multifrequency-swept optical coherence microscopy for highspeed full-field tomographic vibrometry in biological tissues Reviewed

    Samuel Choi, Keita Sato, Takeru Ota, Fumiaki Nin, Shogo Muramatsu, Hiroshi Hibino

    BIOMEDICAL OPTICS EXPRESS   8 ( 2 )   608 - 621   2017.2

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    DOI： 10.1364/BOE.8.000608

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  • Computer modeling defines the system driving a constant current crucial for homeostasis in the mammalian cochlea by integrating unique ion transports. Reviewed International journal

    Nin F, Yoshida T, Murakami S, Ogata G, Uetsuka S, Choi S, Doi K, Sawamura S, Inohara H, Komune S, Kurachi Y, Hibino H

    NPJ systems biology and applications   3   24 - 24   2017

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    The cochlear lateral wall-an epithelial-like tissue comprising inner and outer layers-maintains +80 mV in endolymph. This endocochlear potential supports hearing and represents the sum of all membrane potentials across apical and basolateral surfaces of both layers. The apical surfaces are governed by K+ equilibrium potentials. Underlying extracellular and intracellular [K+] is likely controlled by the "circulation current," which crosses the two layers and unidirectionally flows throughout the cochlea. This idea was conceptually reinforced by our computational model integrating ion channels and transporters; however, contribution of the outer layer's basolateral surface remains unclear. Recent experiments showed that this basolateral surface transports K+ using Na+, K+-ATPases and an unusual characteristic of greater permeability to Na+ than to other ions. To determine whether and how these machineries are involved in the circulation current, we used an in silico approach. In our updated model, the outer layer's basolateral surface was provided with only Na+, K+-ATPases, Na+ conductance, and leak conductance. Under normal conditions, the circulation current was assumed to consist of K+ and be driven predominantly by Na+, K+-ATPases. The model replicated the experimentally measured electrochemical properties in all compartments of the lateral wall, and endocochlear potential, under normal conditions and during blocking of Na+, K+-ATPases. Therefore, the circulation current across the outer layer's basolateral surface depends primarily on the three ion transport mechanisms. During the blockage, the reduced circulation current partially consisted of transiently evoked Na+ flow via the two conductances. This work defines the comprehensive system driving the circulation current.

    DOI： 10.1038/s41540-017-0025-0

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  • Vibration distribution measurement using phase-shifting interferometry and down-sampling technique Reviewed

    Takamasa Suzuki, Ryo Umeki, Samuel Choi, Osami Sasaki

    Optics InfoBase Conference Papers   2017   2017

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    DOI： 10.1364/OFT.2017.OW4B.4

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  • The unique ion permeability profile of cochlear fibrocytes and its contribution to establishing their positive resting membrane potential Reviewed

    Takamasa Yoshida, Fumiaki Nin, Shingo Murakami, Genki Ogata, Satoru Uetsuka, Samuel Choi, Takashi Nakagawa, Hidenori Inohara, Shizuo Komune, Yoshihisa Kurachi, Hiroshi Hibino

    PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY   468 ( 9 )   1609 - 1619   2016.9

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    DOI： 10.1007/s00424-016-1853-2

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  • WIDE-FIELD HETERODYNE VIBROMETRY FOR MEASUREMENT OF SURFACE VIBRATIONS IN BIOLOGICAL TISSUES Reviewed

    Samuel Choi, Fumiaki Nin, Takamasa Suzuki, Hiroshi Hibino

    2016 INTERNATIONAL CONFERENCE ON OPTICAL MEMS AND NANOPHOTONICS (OMN)   2016

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    DOI： 10.1109/OMN.2016.7565864

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  • Profile measurement of thin films by backpropagation of multiple-wavelength optical fields with two sinusoidal phase-modulating interferometers Reviewed

    Osami Sasaki, Jian Xin, Samuel Choi, Takamasa Suzuki

    OPTICS COMMUNICATIONS   356   578 - 581   2015.12

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    DOI： 10.1016/j.optcom.2015.08.066

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  • Wide-field heterodyne interferometric vibrometry for two-dimensional surface vibration measurement Reviewed

    Samuel Choi, Yuta Maruyama, Takamasa Suzuki, Fumiaki Nin, Hiroshi Hibino, Osami Sasaki

    OPTICS COMMUNICATIONS   356   343 - 349   2015.12

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    DOI： 10.1016/j.optcom.2015.08.016

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  • Self-pulsation laser diode interferometer based on spectral-domain optical coherence tomography Invited Reviewed

    T. Suzuki, Y. Ueno, S. Choi

    Technical digest of OIE2015   28 - 29   2015.9

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  • Phase-shifting interferometer with pulse modulation based on a downsampling technique Reviewed

    Takuma Serizawa, Takamasa Suzuki, Samuel Choi

    OPTICAL ENGINEERING   54 ( 8 )   2015.8

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    DOI： 10.1117/1.OE.54.8.085107

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  • Multifrequency swept common-path en-face OCT for wide-field measurement of interior surface vibrations in thick biological tissues Reviewed

    Samuel Choi, Tomoya Watanabe, Takamasa Suzuki, Fumiaki Nin, Hiroshi Hibino, Osami Sasaki

    OPTICS EXPRESS   23 ( 16 )   21078 - 21089   2015.8

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    DOI： 10.1364/OE.23.021078

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  • Multifrequency swept common-path en-face OCT for wide-field measurement of interior surface vibrations in thick biological tissues Reviewed

    Samuel Choi, Tomoya Watanabe, Takamasa Suzuki, Fumiaki Nin, Hiroshi Hibino, Osami Sasaki

    OPTICS EXPRESS   23 ( 16 )   21078 - 21089   2015.8

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    DOI： 10.1364/OE.23.021078

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  • Optical multi-frequency swept sensing for wide-field vibration measurement of interior surfaces in biological tissue Reviewed

    S. Choi, F. Nin, H. Hibino, T. Suzuki

    Progress in Biomedical Optics and Imaging - Proceedings of SPIE   9792   2015

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    DOI： 10.1117/12.2204984

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  • 3-D OCT Data Denoising with Nonseparable Oversampled Lapped Transform Reviewed

    Shogo Muramatsu, Samuel Choi, Takumi Kawamura

    2015 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA)   901 - 906   2015

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    DOI： 10.1109/APSIPA.2015.7415402

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  • Two-dimensional thickness measurement using acousto-optically tuned external-cavity laser diode Reviewed

    Takamasa Suzuki, Shingo Abe, Samuel Choi

    OPTICAL SYSTEMS DESIGN 2015: OPTICAL FABRICATION, TESTING, AND METROLOGY V   9628   2015

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    DOI： 10.1117/12.2193027

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  • Optical multi-frequency swept sensing for wide-field vibration measurement of interior surfaces in biological tissue Reviewed

    S. Choi, F. Nin, H. Hibino, T. Suzuki

    BIOPHOTONICS JAPAN 2015   9792   2015

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    DOI： 10.1117/12.2204984

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  • Three-dimensional step-height measurement using sinusoidal wavelength scanning interferometer with four-step phase-shift method Reviewed

    Samuel Choi, Shouhei Takahashi, Osami Sasaki, Takamasa Suzuki

    OPTICAL ENGINEERING   53 ( 8 )   2014.8

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    DOI： 10.1117/1.OE.53.8.084110

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  • Multi-frequency scanning interferometry using variable spatial spectral filter Reviewed

    Samuel Choi, Ryoko Sato, Heiichi Kato, Osami Sasaki, Takamasa Suzuki

    OPTICS COMMUNICATIONS   316   168 - 173   2014.4

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    DOI： 10.1016/j.optcom.2013.12.015

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  • Low-coherence interferomety based on continuous wavelet transform Reviewed

    Takamasa Suzuki, Hiroo Matsui, Samuel Choi, Osami Sasaki

    OPTICS COMMUNICATIONS   311   172 - 176   2014.1

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    DOI： 10.1016/j.optcom.2013.08.018

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  • Full-field step profile measurement with sinusoidal wavelength scanning interferometer Reviewed

    Samuel Choi, Osami Sasaki, Takama Suzuki

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS III   9110   2014

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    DOI： 10.1117/12.2053539

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  • Low-coherence interferometer using a pulsation laser diode Reviewed

    Takamasa Suzuki, Yusuke Ueno, Samuel Choi, Osami Sasaki

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS III   9110   2014

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    DOI： 10.1117/12.2050190

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  • Two-Wavelength Multi-Gigahertz Frequency Comb-Based Interferometry for Full-Field Profilometry Reviewed

    Samuel Choi, Ken Kashiwagi, Shuto Kojima, Yosuke Kasuya, Takashi Kurokawa

    APPLIED PHYSICS EXPRESS   6 ( 10 )   2013.10

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    DOI： 10.7567/APEX.6.106601

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  • Wide-range wavelength tuning in a VCSEL based on pulsed modulation Invited Reviewed

    T. Suzuki, T. Ishizuka, S. Choi, O. Sasaki

    Technical digest of OIE13   23 - 24   2013.9

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  • Wavelength-scanning interferometers for shape measurement of thin films by backpropagation of multiple-wavelength optical fields Reviewed

    O. Sasaki, X. Jian, C. Samuel, T. Suzuki

    Proc. CLEO-PR 2013   TuF4-4   2013.7

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  • Profile measurement of glass sheet using multiple wavelength backpropagation interferometry Reviewed

    Samuel Choi, Kohei Otsuki, Osami Sasaki, Takamasa Suzuki

    APPLIED OPTICS   52 ( 16 )   3726 - 3731   2013.6

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    DOI： 10.1364/AO.52.003726

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  • Profile measurement of glass sheet using multiple wavelength backpropagation interferometry Reviewed

    Samuel Choi, Kohei Otsuki, Osami Sasaki, Takamasa Suzuki

    APPLIED OPTICS   52 ( 16 )   3726 - 3731   2013.6

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    DOI： 10.1364/AO.52.003726

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  • OCT based on multi-frequency sweeping Fizeau interferometer with phase modulating method Reviewed

    S. Choi, T. Watanabe, O. Sasaki, T. Suzuki

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS II   8839   2013

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    DOI： 10.1117/12.2023816

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  • Time-Shared Multiple Optical Traps Using a Pulsed Laser Diode Reviewed

    Takamasa Suzuki, Hiroyuki Takayama, Osami Sasaki, Samuel Choi

    2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)   WJ3-4   2013

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  • Coaxial phase-shifting laser diode interferometer based on pulse modulation Reviewed

    Takamasa Suzuki, Takuma Serizawa, Osami Sasaki, Samuel Choi

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS II   8839   2013

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    DOI： 10.1117/12.2023531

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  • Surface profile measurement of a diffraction grating by a laser beam scanning interferometer using sinusoidal phase modulation Reviewed

    Osami Sasaki, Takuya Kubota, Samuel Choi, Takamasa Suzuki

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS II   8839   2013

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    DOI： 10.1117/12.2025328

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  • Multi-frequency Light Source Using Spatial Light Modulator for Profilometry Reviewed

    Samuel Choi, Shunsuke Takatsuka, Osami Sasaki, Takamasa Suzuki

    2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS PACIFIC RIM (CLEO-PR)   2013

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    DOI： 10.1109/CLEOPR.2013.6600579

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  • Step-height measurement with a low coherence interferometer using continuous wavelet transform Reviewed

    Zhang Jian, Takamasa Suzuki, Samuel Choi, Osami Sasaki

    2013 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTOELECTRONIC MEASUREMENT TECHNOLOGY AND SYSTEMS   9046   2013

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    DOI： 10.1117/12.2042640

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  • Multi-gigahertz frequency comb-based interferometry using frequency-variable supercontinuum generated by optical pulse synthesizer Reviewed

    Samuel Choi, Ken Kasiwagi, Yosuke Kasuya, Shuto Kojima, Tatsutoshi Shioda, Takashi Kurokawa

    OPTICS EXPRESS   20 ( 25 )   27820 - 27829   2012.12

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    DOI： 10.1364/OE.20.027820

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  • Phase-shifting laser diode interferometer using pulse modulation Reviewed

    Takamasa Suzuki, Tsubasa Adachi, Osami Sasaki, Samuel Choi

    APPLIED OPTICS   51 ( 18 )   4109 - 4112   2012.6

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    DOI： 10.1364/AO.51.004109

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  • Phase-shifting laser diode interferometer using pulse modulation Reviewed

    Takamasa Suzuki, Tsubasa Adachi, Osami Sasaki, Samuel Choi

    APPLIED OPTICS   51 ( 18 )   4109 - 4112   2012.6

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    DOI： 10.1364/AO.51.004109

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  • Utilization of frequency information in a linear wavenumber-scanning interferometer for profile measurement of a thin film Reviewed

    Osami Sasaki, Satoshi Hirakubo, Samuel Choi, Takamasa Suzuki

    APPLIED OPTICS   51 ( 13 )   2429 - 2435   2012.5

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    DOI： 10.1364/AO.51.002429

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  • Utilization of frequency information in a linear wavenumber-scanning interferometer for profile measurement of a thin film Reviewed

    Osami Sasaki, Satoshi Hirakubo, Samuel Choi, Takamasa Suzuki

    APPLIED OPTICS   51 ( 13 )   2429 - 2435   2012.5

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    DOI： 10.1364/AO.51.002429

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  • Profilometry based on comb interval frequency sweeping of two supercontinua with different center wavelengths Reviewed

    Shuto Kojima, Yosuke Kasuya, Ken Kashiwagi, Samuel Choi, Takashi Kurokawa

    Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012   855 - 856   2012

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    DOI： 10.1109/OECC.2012.6276664

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  • Multi-frequency sweeping sinusoidal phase modulated Fizeau interferometer for OCT Reviewed

    S. Choi, J. Hukumoto, O. Sasaki, T. Suzuki

    Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012   568 - 569   2012

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    DOI： 10.1109/OECC.2012.6276575

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  • Sinusoidal wavelength-scanning interferometer for profile measurement of metal surfaces Reviewed

    Osami Sasaki, Takahiro Kurashige, Samuel Choi, Takamasa Suzuki

    INTERFEROMETRY XVI: TECHNIQUES AND ANALYSIS   8493   2012

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    DOI： 10.1117/12.929137

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  • Multi-frequency sweeping interferometry using spatial optical frequency modulation Reviewed

    Samuel Choi, Heiichi Kato, Osami Sasaki, Takamasa Suzuki

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS II   8563   2012

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    DOI： 10.1117/12.999555

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  • Absolute measurement of optical surface profile with a Fizeau interferometer Reviewed

    Osami Sasaki, Akihiro Watanabe, Samuel Choi, Takamasa Suzuki

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS II   8563   2012

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    DOI： 10.1117/12.2000145

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  • Real-time displacement measurement using VCSEL interferometer Reviewed

    Takamasa Suzuki, Noriaki Yamada, Osami Sasaki, Samuel Choi

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS II   8563   2012

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    DOI： 10.1117/12.999720

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  • Step-height measurement by low-coherence interferometry based on wavelet transform

    Takamasa Suzuki, Satoshi Atsumi, Osami Sasaki, Samuel Choi

    Computational Optical Sensing and Imaging, COSI 2012   JTu5A.4   2012

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  • Step-height measurement by low-coherence interferometry based on wavelet transform

    Takamasa Suzuki, Satoshi Atsumi, Osami Sasaki, Samuel Choi

    Applied Industrial Optics: Spectroscopy, Imaging and Metrology, AIO 2012   JTu5A.4   2012

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  • Frequency comb generator using spatial frequency optical filter and its interferometeric characteristics Reviewed

    S. Choi, H. Kato, O. Sasaki, T. Suzuki

    Proc. The ninth Japan-Finland Joint Symposium on Optics in Engineering   2011.9

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  • Rapid wavelength scanning based on acousto-optically tuned external-cavity laser diode Reviewed

    Takamasa Suzuki, Ryu-ichi Nagai, Osami Sasaki, Samuel Choi

    OPTICS COMMUNICATIONS   284 ( 19 )   4615 - 4618   2011.9

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    DOI： 10.1016/j.optcom.2011.06.012

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  • Phase-shifting interferometer using a pulsed laser diode Reviewed

    T. Suzuki, T. Adachi, O. Sasaki, S. Choi

    Proc. The ninth Japan-Finland Joint Symposium on Optics in Engineering   2011.9

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  • Enhancement of optical gradient force employed in optical tweezers using a pulsed laser diode Reviewed

    T. Suzuki, T. Maeda, O. Sasaki, S. Choi

    Proc. 2011 OSA Optics & Photonics Congress   OTMD4p   2011.4

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  • Spectral interferometer using sinusoidal phase modulation and back-propagation method Reviewed

    S. Choi, K. Otsuki, O. Sasaki, T. Suzuki

    2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.   325 - 326   2011

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    DOI： 10.1109/IQEC-CLEO.2011.6194003

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  • Profile measurement of thin films by linear wavenumber-scanning interferometry Reviewed

    Osami Sasaki, Satoshi Hirakubo, Samuel Choi, Takamasa Suzuki

    DIMENSIONAL OPTICAL METROLOGY AND INSPECTION FOR PRACTICAL APPLICATIONS   8133   2011

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    DOI： 10.1117/12.894454

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  • Beam scanning laser interferometer with high spatial resolution over a large field of view Reviewed

    Osami Sasaki, Tsuyoshi Saito, Samuel Choi, Takamasa Suzuki

    2011 INTERNATIONAL CONFERENCE ON OPTICAL INSTRUMENTS AND TECHNOLOGY: OPTOELECTRONIC MEASUREMENT TECHNOLOGY AND SYSTEMS   8201   2011

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    DOI： 10.1117/12.910102

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  • Profilometry using optical comb light source and sinusoidal phase modulation technique in Fizeau-type interferometer Reviewed

    S. Choi, H. Miyatsuka, O. Sasaki, T. Suzuki

    Proc. of Photonics Asia 2010   7855   19   2010.10

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    DOI： 10.1117/12.870985

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  • Profilometry using Fizeau-interferometer based on optical comb interferometry and sinusoidal phase modulation method Reviewed

    Samuel Choi, Hidetaka Miyatsuka, Osami Sasaki, Takamasa Suzuki

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS   7855   2010

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1117/12.870985

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  • Multiple-wavelength interferometers using backpropagation of optical fields for profile measurement of thin glass sheets Reviewed

    Osami Sasaki, Choi Samuel, Takamasa Suzuki

    INTERFEROMETRY XV: TECHNIQUES AND ANALYSIS   7790   2010

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    DOI： 10.1117/12.861534

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  • Sinusoidal wavelength-scanning common-path interferometer with a beam-scanning system for measurement of film thickness variations Reviewed

    Osami Sasaki, Takafumi Morimatsu, Samuel Choi, Takamasa Suzuki

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS   7855   2010

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1117/12.871030

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  • Profile measurement based on spectral interferometer with multi-wavelength back-propagation methods Reviewed

    Kohei Otsuki, Samuel Choi, Osami Sasaki, Takamasa Suzuki

    OPTICAL METROLOGY AND INSPECTION FOR INDUSTRIAL APPLICATIONS   7855   2010

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    DOI： 10.1117/12.870987

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  • Highly Precise Optical Pulse Synthesis for Flat Spectrum Supercontinuum Generation with Wide Mode Spacing Reviewed

    Ken Kashiwagi, Hiroyuki Ishizu, Yuichiro Kodama, Samuel Choi, Takashi Kurokawa

    2010 36TH EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION (ECOC), VOLS 1 AND 2   2010

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  • Supercontinuum Comb Generation Using Optical Pulse Synthesizer and Highly Nonlinear Dispersion-Shifted Fiber Reviewed

    Samuel Choi, Naoyuki Tamura, Ken Kashiwagi, Tatsutoshi Shioda, Yosuke Tanaka, Takashi Kurokawa

    JAPANESE JOURNAL OF APPLIED PHYSICS   48 ( 9 )   2009.9

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    DOI： 10.1143/JJAP.48.09LF01

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  • Profilometry based on optical frequency comb Reviewed

    Samuel Choi, Takashi Kurokawa

    2009 LASERS & ELECTRO-OPTICS & THE PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1 AND 2   1229 - 1230   2009

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  • Three-dimensional microscopic interferometer by frequency sweep of supercontinuum frequency comb Reviewed

    Samuel Choi, Naoyuld Tamura, Ryo Kobe, Thtsutoshi Shioda, Yosuke Tanaka, Takashi Kurokawa

    2008 CONFERENCE ON LASERS AND ELECTRO-OPTICS & QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE, VOLS 1-9   450 - 451   2008

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/CLEO.2008.4551160

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  • Frequency-comb-based interference microscope with a line-type image sensor Reviewed

    Samuel Choi, Tatsutoshi Shioda, Yosuke Tanaka, Takashi Kurokawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 10A )   6842 - 6847   2007.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JJAP.46.6842

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  • Application of faraday rotator reflector and faraday rotator transmitter to profilometry and tomography Reviewed

    Tatsutoshi Shioda, Daisuke Moteki, Samuel Choi, Yosuke Tanaka, Takashi Kurokawa

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS   46 ( 10A )   6848 - 6852   2007.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1143/JJAP.46.6848

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  • Frequency comb based interference microscope with a line-type image sensor Reviewed

    Samuel Choi, Tatsutoshi Shioda, Yosuke Tanaka, Takashi Kurokawa

    2007 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS, VOLS 1-4   399 - 400   2007

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/CLEOPR.2007.4391287

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  • Frequency-comb-based interferometer for profilometry and tomography Reviewed

    S Choi, M Yamamoto, D Moteki, T Shioda, Y Tanaka, T Kurokawa

    OPTICS LETTERS   31 ( 13 )   1976 - 1978   2006.7

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OL.31.001976

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  • Interferometer for profilometry and tomography using waveguide-type frequency comb generator Reviewed

    Samuel Choi, Daisuke Moteki, Tatsuya Sugimoto, Yosuke Tanaka, Takashi Kurokawa

    Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006   2006

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1109/CLEO.2006.4627912

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  • A novel profilometry using frequency comb light source Reviewed

    S Choi, M Yamamoto, D Moteki, T Shioda, Y Tanaka, M Takeda, T Kurokawa

    2005 PACIFIC RIM CONFERENCE ON LASERS AND ELECTRO-OPTICS   1007 - 1009   2005

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MISC

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Awards

  • 第3回学長賞

    2016.11   新潟大学   若手教員研究奨励

    崔 森悦

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  • コニカミノルタ画像科学奨励賞（優秀賞）

    2015.3   コニカミノルタ画像科学技術振興財団   生体内3次元振動分布の可視化技術の開発

    崔 森悦

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Research Projects

  • 深さ分解能の制約を打破した超高速光コム断層ダイナミック計測装置の開発

    Grant number：24K21607

    2024.6 - 2027.3

    System name：科学研究費助成事業

    Research category：挑戦的研究(萌芽)

    Awarding organization：日本学術振興会

    崔 森悦, 任 書晃

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    Grant amount：\6370000 （ Direct Cost: \4900000 、 Indirect Cost：\1470000 ）

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  • 内耳性難聴の予防・予後診断を志向した超音波聴力検査装置の創製

    Grant number：24K02596

    2024.4 - 2027.3

    System name：科学研究費助成事業

    Research category：基盤研究(B)

    Awarding organization：日本学術振興会

    任 書晃, 安部 力, 土井 謙太郎, 奥田 弘, 小原 奈津子, 崔 森悦, 堀井 和広

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    Grant amount：\18590000 （ Direct Cost: \14300000 、 Indirect Cost：\4290000 ）

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  • Development and application of dynamic polarization sensitive optical coherence tomography

    Grant number：24K00897

    2024.4 - 2027.3

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

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    Grant amount：\18460000 （ Direct Cost: \14200000 、 Indirect Cost：\4260000 ）

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  • Development of en-face OCT vibromery technology for medical applications

    Grant number：19KK0364

    2022 - 2024

    System name：Grants-in-Aid for Scientific Research

    Research category：Fund for the Promotion of Joint International Research (Fostering Joint International Research (A))

    Awarding organization：Japan Society for the Promotion of Science

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    Grant amount：\15210000 （ Direct Cost: \11700000 、 Indirect Cost：\3510000 ）

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  • 周期可変回折格子を用いた高速広帯域波長走査光源の構築とＯＣＴへの展開

    Grant number：21K04922

    2021.4 - 2024.3

    System name：科学研究費助成事業

    Research category：基盤研究(C)

    Awarding organization：日本学術振興会

    鈴木 孝昌, 崔 森悦

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    Grant amount：\4160000 （ Direct Cost: \3200000 、 Indirect Cost：\960000 ）

    本研究の目的は、音響光学偏向器（AOD）を単なる光偏向器としてではなく、周期可変な回折格子として捉え、新たな原理の波長走査光源（SS）を構築するとともに、光コヒーレンストモグラフィ（OCT）への展開を図ることにある。
    令和３年度は、研究実施計画に従い、以下の通り研究を進めた。
    外乱の影響を排除しつつ機械的安定度を高めるため、専用の筐体を設計し、これまで使用実績のある840nm帯の無反射コート半導体レーザ（AR-LD）を用いて新提案の波長走査光源（SS）を構築した。ここで音響光学偏向器（AOD）の印過電圧を制御し、波長走査幅を測定したところ、約60nmの波長走査幅が得られた。また、測定された波長は、理論曲線に沿って変化することを確認した。ただし、ゲイン特性から期待される波長走査幅目標値（約80nm）の達成は困難であった。LDの損傷や劣化を考慮し、注入電流を低めに抑えたことが一因と考えられるが、他の要因に関して検証を行っていく必要がある。一方、波長走査周波数（速度）の上限値は、約50ｋHzであった。圧電素子（PZT）等を用いた機械的な波長走査に比較すると走査周波数は飛躍的に向上することが示された。ここまでの内容が、令和３年度実施計画に示された内容であり、研究は当初の計画通り遂行することができた。特に、AODを周期可変な回折格子とし用い、新たな原理に基づいてSSを構築できた意義は大きく、今後の光計測技術進展への寄与は大きいものと考えられる。
    加えて、令和３年度は、以下に詳述の通りOCTシステムでの動作検証、特許出願、論文発表を行った。

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  • Structured Convolutional Networks for High-dimensional Signal Restoration

    Grant number：19H04135

    2019.4 - 2022.3

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

    Muramatsu Shogo

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    Grant amount：\17680000 （ Direct Cost: \13600000 、 Indirect Cost：\4080000 ）

    The purpose of this study was to clarify effective structural constraints on generative models of high-dimensional signals in order to improve the efficiency and performance of high-dimensional signal restoration. New structured dictionaries and structured convolutional networks were constructed, and efforts were made to improve the efficiency of complex extension, parallelization, hierarchization, multilayering, learning design, and restoration algorithms. We evaluated the effectiveness of the proposed restoration process on a variety of real data, including volumetric data, complex image data, and high-dimensional time series data.
    As research results, we made 21 presentations at domestic conferences, 16 presentations at international conferences, and published 3 papers in academic journals.

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  • Development of optical tomographic imaging system for in-vivo nano-vibration measurement of whole 3D structure in biological tissue

    Grant number：19H02151

    2019.4 - 2022.3

    System name：Grants-in-Aid for Scientific Research

    Research category：Grant-in-Aid for Scientific Research (B)

    Awarding organization：Japan Society for the Promotion of Science

    Choi Samuel

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    Grant amount：\17940000 （ Direct Cost: \13800000 、 Indirect Cost：\4140000 ）

    In this study, we aimed to develop an optical tomography imaging system oriented to nano-vibration measurement of the entire 3D structure at the biological tissue. First, we proposed the principle of a heterodyne coherence microscope that can measure the vibration distribution along with a three-dimensional tomographic scan, and demonstrated its usefulness through validation experiments. Next, we constructed a system using a DD-MZM comb generator and proposed a method to realize ultra high-speed measurement at a scan rate of 20 MHz, which enables transient measurement of the vibration state as well as depth profile. Furthermore, by applying the same light source to a spatial interference microscope, it was shown that 3D measurements with nano-order precision over a wide depth range of several hundred micrometers to millimeters are possible. The possibility of the proposed methodwas demonstrated.

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  • 先端遺伝子工学を駆使した変動性難聴モデル動物の確立とその応用

    2018.4 - 2022.3

    System name：科学研究費助成事業 基盤研究(A)

    Awarding organization：日本学術振興会

    日比野 浩

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    Grant type：Competitive

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  • 難聴モデル動物の病態解明を志向した内耳ナノ振動の新規計測プラットフォームの構築

    2018.4 - 2021.3

    System name：科学研究費助成事業 基盤研究(B)

    Awarding organization：日本学術振興会

    任 書晃

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    Grant type：Competitive

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  • 超音波駆動波長走査光源とウェーブレット変換処理を用いた実時間フルフィールドＯＣＴ

    2016.4 - 2019.3

    System name：科学研究費助成事業 基盤研究(C)

    Awarding organization：日本学術振興会

    鈴木 孝昌

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    Grant type：Competitive

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  • 周波数可変広帯域光コムを用いた生体3次元断層振動撮像装置の開発

    2016.4 - 2019.3

    System name：科研費 基盤研究(B)

    Awarding organization：日本学術振興会

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\17940000 （ Direct Cost: \13800000 、 Indirect Cost：\4140000 ）

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  • 光コムを用いた超高精細な生体断層振動イメージング装置の開発

    2016.4 - 2017.3

    System name：自然科学研究助成

    Awarding organization：双葉電子記念財団

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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  • 内耳による音のナノ振動の受容・応答機構の解明と難聴治療への展開

    2015.12 - 2021.3

    System name：革新的先端研究開発支援事業 AMED-CREST 「メカノバイオロジー機構の解明による革新的医療機器及び医療技術の創出」

    Awarding organization：国立研究開発法人日本医療研究開発機構

    日比野 浩

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    Grant type：Competitive

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  • プリンタブルエレクトロニクス用機能性フィルムの高精度断層検査装置の開発

    2015.12 - 2016.12

    System name：マッチングプランナー・プログラム

    Awarding organization：国立研究開発法人 科学技術振興機構

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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  • 生体内3次元振動分布の可視化技術の開発

    2015 - 2016

    System name：コニカミノルタ画像科学奨励

    Awarding organization：コニカミノルタ科学技術振興財団

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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  • 生体内3次元振動分布の可視化へ向けた多波長光ホログラフィック・トモグラフィー装置の開発

    2014.12 - 2015.12

    System name：研究成果展開事業（研究成果最適展開支援プログラム（A-STEP））

    Awarding organization：国立研究開発法人 科学技術振興機構

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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  • 多波長ホログラフィック高精細生体断層撮像装置の開発

    2014.4 - 2016.3

    System name：科研費 若手研究(B)

    Awarding organization：日本学術振興会

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\4030000 （ Direct Cost: \3480000 、 Indirect Cost：\550000 ）

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  • 光周波数コムを用いた構造物の広視野3次元振動歪み形状検査装置の開発

    2014 - 2016

    System name：研究助成

    Awarding organization：内田エネルギー科学振興財団

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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  • 表面プラズモン光を用いる干渉断層像センシング

    2012.4 - 2014.3

    System name：科研費 挑戦的萌芽研究

    Awarding organization：日本学術振興会

    佐々木 修己

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    Grant type：Competitive

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  • 空間周波数コム光源を用いた計測システムの開発

    2011.4 - 2014.3

    System name：科研費 若手研究(B)

    Awarding organization：日本学術振興会

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

    Grant amount：\4290000 （ Direct Cost: \3480000 、 Indirect Cost：\810000 ）

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  • 光コムと正弦波位相変調法による光コヒーレンス・トモグラフィーの開発

    2010 - 2011

    System name：奨励研究助成

    Awarding organization：中谷電子計測技術振興財団

    崔 森悦

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    Authorship：Principal investigator  Grant type：Competitive

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Teaching Experience

  • 論文輪講

    2024
    Institution name：新潟大学

  • 自然科学総論III

    2024
    Institution name：新潟大学

  • 電子情報通信実験II

    2023
    Institution name：新潟大学

  • 光計測特論

    2021
    Institution name：新潟大学

  • 卒業研修

    2020
    Institution name：新潟大学

  • 卒業研究

    2020
    Institution name：新潟大学

  • 電子情報通信設計製図

    2020
    Institution name：新潟大学

  • 論文輪講I

    2020
    -
    2023
    Institution name：新潟大学

  • 論文輪講II

    2020
    -
    2023
    Institution name：新潟大学

  • 電子情報通信実験IIB

    2020
    -
    2022
    Institution name：新潟大学

  • 電子情報通信実験IIA

    2020
    -
    2022
    Institution name：新潟大学

  • 先端科学技術総論

    2020
    Institution name：新潟大学

  • リメディアル演習

    2020
    Institution name：新潟大学

  • 電子情報通信実験IIIB

    2020
    Institution name：新潟大学

  • 電子情報通信実験IIIA

    2020
    Institution name：新潟大学

  • 工学リテラシー入門(情報電子分野)

    2019
    Institution name：新潟大学

  • 総合技術科学演習

    2019
    -
    2023
    Institution name：新潟大学

  • プログラミングBII

    2018
    -
    2022
    Institution name：新潟大学

  • プログラミングBI

    2018
    -
    2022
    Institution name：新潟大学

  • 電子情報通信概論

    2017
    Institution name：新潟大学

  • 電気数理II

    2016
    -
    2022
    Institution name：新潟大学

  • プログラミング演習

    2016
    -
    2017
    Institution name：新潟大学

  • 光コヒ-レンス工学

    2015
    Institution name：新潟大学

  • 光応用工学

    2014
    Institution name：新潟大学

  • 電気電子工学研究発表(外部発表)

    2014
    -
    2015
    Institution name：新潟大学

  • 電気電子工学文献詳読Ⅱ

    2014
    -
    2015
    Institution name：新潟大学

  • 光コヒ－レンス工学

    2013
    Institution name：新潟大学

  • 電気電子工学文献詳読Ⅰ

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学特定研究Ⅱ

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学セミナーⅠ

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学セミナーⅡ

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学特定研究Ⅰ

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学研究発表演習(中間発表)

    2013
    -
    2015
    Institution name：新潟大学

  • 電気電子工学研究発表演習(外部発表)

    2013
    Institution name：新潟大学

  • 電気回路演習I

    2013
    Institution name：新潟大学

  • 電磁気学演習I

    2011
    -
    2015
    Institution name：新潟大学

  • 電磁気学演習II

    2011
    -
    2012
    Institution name：新潟大学

  • エレクトロニクスへの招待

    2010
    -
    2016
    Institution name：新潟大学

  • 工学リテラシー入門(電気電子工学科)

    2010
    -
    2015
    Institution name：新潟大学

  • 連続時間アナログ信号処理

    2010
    -
    2012
    Institution name：新潟大学

  • プログラミング基礎演習

    2010
    Institution name：新潟大学

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