Tetsuya Yamamoto

ORCID

Publication Activity (10 Years)

Years Active: 1986-2024
Publications (10 Years): 24

Top Venues

IEICE Trans. Commun.

CCNC

Medical Imaging: Computer-Aided Diagnosis

APCC

Publications

Kai Nakamura, Hiroki Nishiyama, Akihiko Nishio, Tetsuya Yamamoto, Toshiaki Sakurai, Takayuki Sotoyama
A Processing Task Offloading Technique for Energy-Efficient vRANs Powered by Renewable Energy. ICC Workshops (2024)
Keisuke Asano, Mamoru Okumura, Takumi Abe, Eiji Okamoto, Tetsuya Yamamoto
High-Quality Secure Wireless Transmission Scheme Using Polar Codes and Radio-Wave Encrypted Modulation. IEICE Trans. Commun. 106 (4) (2023)
Keisuke Asano, Takumi Abe, Kenta Kato, Eiji Okamoto, Tetsuya Yamamoto
High-Quality and Low-Complexity Polar-Coded Radio-Wave Encrypted Modulation Utilizing Multipurpose Frozen Bits. IEICE Trans. Commun. 106 (10) (2023)
Mamoru Okumura, Keisuke Asano, Takumi Abe, Eiji Okamoto, Tetsuya Yamamoto
Performance Improvement of Radio-Wave Encrypted MIMO Communications Using Average LLR Clipping. IEICE Trans. Commun. (8) (2022)
Kaga Tomoki, Mamoru Okumura, Eiji Okamoto, Tetsuya Yamamoto
Multi-Level Encrypted Transmission Scheme Using Hybrid Chaos and Linear Modulation. IEICE Trans. Commun. (5) (2022)
Mamoru Okumura, Kaga Tomoki, Eiji Okamoto, Tetsuya Yamamoto
Chaos-Based Interleave Division Multiple Access Scheme with Physical Layer Security. CCNC (2021)
Kohei Miyata, Takahiko Koike, Eri Nakagawa, Tokiko Harada, Motofumi Sumiya, Tetsuya Yamamoto, Norihiro Sadato
Neural substrates for sharing intention in action during face-to-face imitation. NeuroImage 233 (2021)
Yoshihisa Okamoto, Takafumi Sasaoka, Norihiro Sadato, Masaki Fukunaga, Tetsuya Yamamoto, Zu Soh, Takahide Nouzawa, Shigeto Yamawaki, Toshio Tsuji
Is Human Brain Activity During Driving Operations Modulated by the Viscoelastic Characteristics of a Steering Wheel?: An fMRI Study. IEEE Access 8 (2020)
Yoshihiro Masuda, Eiji Okamoto, Tetsuya Yamamoto
Low Complexity Decoding of Downlink Chaos NOMA Scheme with Physical Layer Security. CCNC (2020)
Yoshihiro Masuda, Eiji Okamoto, Keita Ito, Tetsuya Yamamoto
An Uplink Non-Orthogonal Multiple Access Scheme Having Physical Layer Security Based on Chaos Modulation. ICOIN (2019)
Takahiro Miura, Ken-ichiro Yabu, Youji Shimizu, Kenichi Tanaka, Masamitsu Furukawa, Seiko Michiyoshi, Tetsuya Yamamoto, Kazutaka Ueda, Tohru Ifukube
Cognitive workload of in-car auditory-vocal interfaces on visuospatial sketchpad based on a dual task of visual pattern test. SAC (2019)
Naoto Horiike, Hiroki Kitagawa, Eiji Okamoto, Tetsuya Yamamoto
Chaos MIMO-based downlink non-orthogonal multiple access scheme with physical layer security. CCNC (2018)
Naoto Horiike, Eiji Okamoto, Tetsuya Yamamoto
A downlink non-orthogonal multiple access scheme having physical layer security. EURASIP J. Wirel. Commun. Netw. 2018 (2018)
Eiji Okamoto, Naoto Horiike, Tetsuya Yamamoto
Large-Scale Grant-Free Sparse Chaos Code Multiple Access Scheme for 5G IoT. VTC Fall (2018)
Eiji Okamoto, Naoto Horiike, Tetsuya Yamamoto
Sparse chaos code multiple access scheme achieving larger capacity and physical layer security. WPMC (2017)
Ryusuke Watanabe, Chisako Muramatsu, Kyoko Ishida, Akira Sawada, Yuji Hatanaka, Tetsuya Yamamoto, Hiroshi Fujita
Automated detection of nerve fiber layer defects on retinal fundus images using fully convolutional network for early diagnosis of glaucoma. Medical Imaging: Computer-Aided Diagnosis (2017)
Naoto Horiike, Eiji Okamoto, Tetsuya Yamamoto
Performance improvement of multi-user chaos MIMO transmission scheme using dirty paper coding. APCC (2017)
Naoto Horiike, Eiji Okamoto, Tetsuya Yamamoto
Performance improvement of chaos MIMO transmission scheme by LDPC code concatenation using symbol MAP detection and STBC. ICOIN (2017)
Chisako Muramatsu, Kyoko Ishida, Akira Sawada, Yuji Hatanaka, Tetsuya Yamamoto, Hiroshi Fujita
Automated detection of retinal nerve fiber layer defects on fundus images: false positive reduction based on vessel likelihood. Medical Imaging: Computer-Aided Diagnosis (2016)
Hidekazu Murata, Eiji Okamoto, Manabu Mikami, Akihiro Okazaki, Satoshi Suyama, Takamichi Inoue, Jun Mashino, Tetsuya Yamamoto, Makoto Taromaru
Radio Access Technologies for Fifth Generation Mobile Communications System: Review of Recent Research and Developments in Japan. IEICE Trans. Commun. (8) (2016)
Takahiro Miura, Ken-ichiro Yabu, Kenichi Tanaka, Hiroshi Ozawa, Masamitsu Furukawa, Seiko Michiyoshi, Tetsuya Yamamoto, Kazutaka Ueda, Tohru Ifukube
Visuospatial Workload Measurement of an Interface Based on a Dual Task of Visual Working Memory Test. AutomotiveUI (2016)
Amnart Boonkajay, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Excess-Bandwidth Transmit Filtering Based on Minimization of Variance of Instantaneous Transmit Power for Low-PAPR SC-FDE. IEICE Trans. Commun. (4) (2015)
Yuki Matsumura, Katsuhiro Temma, Ren Sugai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Interference-Aware Channel Segregation Based Dynamic Channel Assignment for Wireless Networks. IEICE Trans. Commun. (5) (2015)
Hidekazu Murata, Eiji Okamoto, Manabu Mikami, Akihiro Okazaki, Satoshi Suyama, Takamichi Inoue, Jun Mashino, Tetsuya Yamamoto, Makoto Taromaru
R&D activities for 5G in IEICE technical committee on radio communication systems. APCC (2015)
Chisako Muramatsu, Yuji Hatanaka, Kyoko Ishida, Akira Sawada, Tetsuya Yamamoto, Hiroshi Fujita
Preliminary study on differentiation between glaucomatous and non-glaucomatous eyes on stereo fundus images using cup gradient models. Medical Imaging: Computer-Aided Diagnosis (2014)
Tetsuya Yamamoto, Fumiyuki Adachi
Training Sequence Inserted OFDM Transmission with MMSE-FDE. IEICE Trans. Commun. (2) (2014)
Shinya Kumagai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Joint Tx/Rx MMSE Filtering for Single-Carrier MIMO Transmission. IEICE Trans. Commun. (9) (2014)
Yuji Hatanaka, Yuuki Nagahata, Chisako Muramatsu, Susumu Okumura, Kazunori Ogohara, Akira Sawada, Kyoko Ishida, Tetsuya Yamamoto, Hiroshi Fujita
Improved automated optic cup segmentation based on detection of blood vessel bends in retinal fundus images. EMBC (2014)
Hideyuki Moroga, Tetsuya Yamamoto, Fumiyuki Adachi
Iterative Overlap QRM-ML Block Detection for Single-Carrier MIMO Transmission Without CP Insertion. Wirel. Pers. Commun. 74 (4) (2014)
Tetsuya Yamamoto, Fumiyuki Adachi
2-Step Frequency-Domain Iterative Channel Estimation for Training Sequence Inserted Single-Carrier Block Transmission. IEICE Trans. Commun. (1) (2014)
Amnart Boonkajay, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Selective mapping for broadband single-carrier transmission using joint Tx/Rx MMSE-FDE. PIMRC (2013)
Jimmy Hadi Susanto, Hiroyuki Miyazaki, Katsuhiro Temma, Tetsuya Yamamoto, Tatsunori Obara, Fumiyuki Adachi
Linearly distributed antenna diversity using single frequency network for high-speed railway communications. APCC (2013)
Norimichi Mashiko, Tetsuya Yamamoto, Mayumi Akutagawa, Yasuhiro Minamoto
Digitization of Bromide Paper Records to Extract One-Minute Geomagnetic Data. Data Sci. J. 12 (2013)
Amnart Boonkajay, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Frequency-domain single-carrier spread spectrum with joint FDE and spectrum combining. ICICS (2013)
Tetsuya Yamamoto, Fumiyuki Adachi
A Novel Receiver Design for Training Sequence Inserted OFDM Transmission. VTC Fall (2013)
Shinya Kumagai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Joint Tx/Rx MMSE filtering and joint rank adaptation/adaptive modulation for single-carrier MIMO packet transmission. ISPACS (2013)
Masayuki Nakada, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Outage Channel Capacity of Direct/Cooperative AF Relay Switched SC-FDMA Using Spectrum Division/Adaptive Subcarrier Allocation. IEICE Trans. Commun. (4) (2013)
Shinya Kumagai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Adaptive Single-Carrier MIMO Transmission Using Joint Tx/Rx MMSE Filtering. VTC Fall (2013)
Shinya Kumagai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Joint Tx/Rx filtering for single-carrier MIMO spatial multiplexing and HARQ packet combining. ICCS (2012)
Katsuhiro Temma, Tetsuya Yamamoto, Fumiyuki Adachi
Training sequence inserted single-carrier transmission using 2-step QRM-ML block signal detection. ICCS (2012)
Yuki Matsumura, Shinya Kumagai, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Channel segregation based dynamic channel assignment for WLAN. ICCS (2012)
Amnart Boonkajay, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Performance evaluation of Low-PAPR transmit filter for single-carrier transmission. APCC (2012)
Katsuhiro Temma, Tetsuya Yamamoto, Fumiyuki Adachi
2-Step QRM-MLBD Using Detection Ordering for Single-Carrier Transmission. VTC Spring (2012)
Katsuhiro Temma, Tetsuya Yamamoto, Kyesan Lee, Fumiyuki Adachi
2-Step QRM-MLBD for Broadband Single-Carrier Transmission. IEICE Trans. Commun. (4) (2012)
Hideyuki Moroga, Tetsuya Yamamoto, Fumiyuki Adachi
Iterative Overlap TD-QRM-ML Block Signal Detection for Single-Carrier Transmission without CP Insertion. VTC Fall (2012)
Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection. IWCMC (2012)
Hideyuki Moroga, Tetsuya Yamamoto, Fumiyuki Adachi
Overlap QRM-ML Block Signal Detection for Single-Carrier Transmission without CP Insertion. VTC Spring (2012)
Tetsuya Yamamoto, Fumiyuki Adachi
2-Step Frequency-Domain Channel Estimation for Training Sequence Inserted Single-Carrier Block Transmission. VTC Fall (2012)
Masayuki Nakada, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Power Allocation for Direct/Cooperative AF Relay Switched SC-FDMA. VTC Spring (2012)
Shinya Kumagai, Ryusuke Matsukawa, Tatsunori Obara, Tetsuya Yamamoto, Fumiyuki Adachi
Spectral Efficiency of Distributed Antenna Network Using MIMO Spatial Multiplexing. VTC Fall (2012)
Masashi Itagaki, Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Uplink Capacity of OFDM Multi-User MIMO Using Near-ML Detection in a Cellular System. IEICE Trans. Commun. (1) (2012)
Tetsuya Yamamoto, Koichi Adachi, Sumei Sun, Fumiyuki Adachi
Recursive QR packet combining for uplink single-carrier multi-user MIMO HARQ using near ML detection. Wirel. Commun. Mob. Comput. 12 (18) (2012)
Yuji Hatanaka, Chisako Muramatsu, Akira Sawada, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Glaucoma risk assessment based on clinical data and automated nerve fiber layer defects detection. EMBC (2012)
Hideyuki Moroga, Tetsuya Yamamoto, Fumiyuki Adachi
Iterative overlap QRM-MLBD for single-carrier MIMO transmission without CP insertion. WPMC (2012)
Tetsuya Yamamoto, Fumiyuki Adachi
HARQ Throughput Performance of Training Sequence Aided SC-MIMO Using Reduced Complexity ML Block Detection. VTC Spring (2012)
Chisako Muramatsu, Toshiaki Nakagawa, Akira Sawada, Yuji Hatanaka, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Automated segmentation of optic disc region on retinal fundus photographs: Comparison of contour modeling and pixel classification methods. Comput. Methods Programs Biomed. 101 (1) (2011)
Tetsuya Yamamoto, Kazuki Takeda, Kyesan Lee, Fumiyuki Adachi
Transmission Performance of Frequency-Domain Filtered Single-Carrier Transmission Using Frequency-Domain Block Signal Detection with QRM-MLD. IEICE Trans. Commun. (5) (2011)
Yuji Hatanaka, Atsushi Noudo, Chisako Muramatsu, Akira Sawada, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Automatic measurement of cup to disc ratio based on line profile analysis in retinal images. EMBC (2011)
Tomonari Okada, Tetsuya Yamamoto, Tsutomu Terada, Masahiko Tsukamoto
Wearable MC system a system for supporting MC performances using wearable computing technologies. AH (2011)
Fumiyuki Adachi, Tatsunori Obara, Tetsuya Yamamoto
Capacity and BER performance considerations on single-carrier frequency-domain equalization. ICICS (2011)
Tetsuya Yamamoto, Fumiyuki Adachi
Adaptive single-carrier transmission using QRM-ML block signal detection. ICICS (2011)
Fumiyuki Adachi, Kazuki Takeda, Tetsuya Yamamoto, Ryusuke Matsukawa
Gigabit distributed antenna network and its related wireless techniques. IWCMC (2011)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Training Sequence-Aided QRM-MLD Block Signal Detection for Single-Carrier MIMO Spatial Multiplexing. ICC (2011)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Frequency-Domain Block Signal Detection with QRM-MLD for Training Sequence-Aided Single-Carrier Transmission. EURASIP J. Adv. Signal Process. 2011 (2011)
Suguru Okuyama, Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Iterative MMSE Detection with Interference Cancellation for Up-Link HARQ Using Frequency-Domain Filtered SC-FDMA MIMO Multiplexing. IEICE Trans. Commun. (12) (2011)
Fumiyuki Adachi, Kazuki Takeda, Tetsuya Yamamoto, Ryusuke Matsukawa, Shinya Kumagai
Recent advances in single-carrier distributed antenna network. Wirel. Commun. Mob. Comput. 11 (12) (2011)
Katsuhiro Temma, Tetsuya Yamamoto, Fumiyuki Adachi
Improved 2-Step QRM-ML Block Signal Detection for Single-Carrier Transmission. VTC Fall (2011)
Chisako Muramatsu, Yuji Hatanaka, Akira Sawada, Tetsuya Yamamoto, Hiroshi Fujita
Computerized detection of peripapillary chorioretinal atrophy by texture analysis. EMBC (2011)
Akihiro Sugiura, Masaru Miyao, Tetsuya Yamamoto, Hiroki Takada
Effect of strategic accommodation training by wide stereoscopic movie presentation on myopic young people of visual acuity and asthenopia. Displays 32 (4) (2011)
Tetsuya Yamamoto, Tsutomu Terada, Masahiko Tsukamoto
Designing gestures for hands and feet in daily life. MoMM (2011)
Yuji Hatanaka, Atsushi Noudo, Chisako Muramatsu, Akira Sawada, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Vertical cup-to-disc ratio measurement for diagnosis of glaucoma on fundus images. Medical Imaging: Computer-Aided Diagnosis (2010)
Yuji Hatanaka, Atsushi Noudo, Chisako Muramatsu, Akira Sawada, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Automatic Measurement of Vertical Cup-to-Disc Ratio on Retinal Fundus Images. ICMB (2010)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Frequency-Domain Block Signal Detection for Single-Carrier Transmission. IEICE Trans. Commun. (8) (2010)
Fumiyuki Adachi, Kazuki Takeda, Tatsunori Obara, Tetsuya Yamamoto, Hiroki Matsuda
Recent Advances in Single-Carrier Frequency-Domain Equalization and Distributed Antenna Network. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (11) (2010)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Training Sequence-Aided Single-Carrier Block Signal Detection Using QRM-MLD. WCNC (2010)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Frequency-Domain Block Signal Detection with QRM-MLD for Frequency-Domain Filtered Single-Carrier Transmission. VTC Fall (2010)
Hiroki Takada, Tetsuya Yamamoto, Masaru Miyao, Tatehiko Aoyama, Masashi Furuta, Tomoki Shiozawa
Effect of a Stereoscopic Movie on the Correlation between Head Acceleration and Body Sway. HCI (13) (2009)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
Joint Frequency-Domain Equalization and Despreading for Multi-Code DS-CDMA Using Cyclic Delay Transmit Diversity. IEICE Trans. Commun. (5) (2009)
Akihiro Sugiura, Tetsuya Yamamoto, Hiroki Takada, Masaru Miyao
Effect of an Eyesight Recovering Stereoscopic Movie System on Visual Acuity and Asthenopia. HCI (13) (2009)
Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi
A Study of Frequency-Domain Signal Detection for Single- Carrier Transmission. VTC Fall (2009)
Chisako Muramatsu, Toshiaki Nakagawa, Akira Sawada, Yuji Hatanaka, Takeshi Hara, Tetsuya Yamamoto, Hiroshi Fujita
Determination of cup-to-disc ratio of optical nerve head for diagnosis of glaucoma on stereo retinal fundus image pairs. Medical Imaging: Computer-Aided Diagnosis (2009)
Tetsuya Yamamoto, Masahiko Tsukamoto, Tomoki Yoshihisa
Foot-Step Input Method for Operating Information Devices While Jogging. SAINT (2008)
Shoji Tominaga, Tetsuya Yamamoto
Metal-dielectric object classification by polarization degree map. ICPR (2008)
Tetsuya Yamamoto, Aki Miyake, Takahiro Yamada, Toshiyuki Morizane, Tetsuhiro Arimitsu, Hisao Makino, Naoki Yamamoto
Properties of Transparent Conductive Ga-Doped ZnO Films on Glass, PMMA and COP Substrates. IEICE Trans. Electron. (10) (2008)
Kazuki Takeda, Tetsuya Yamamoto, Fumiyuki Adachi
Time-Domain Spreading And Frequency-Domain Spreading for Delay-time/Code Division Multi-Access. VTC Spring (2008)
Yoshinori Hayashi, Toshiaki Nakagawa, Yuji Hatanaka, Akira Aoyama, Masakatsu Kakogawa, Takeshi Hara, Hiroshi Fujita, Tetsuya Yamamoto
Detection of retinal nerve fiber layer defects in retinal fundus images using Gabor filtering. Medical Imaging: Computer-Aided Diagnosis (2007)
Takaaki Kamatani, Tetsuya Yamamoto
Comparison of codon usage and tRNAs in mitochondrial genomes of Candida species. Biosyst. 90 (2) (2007)
Tetsuya Yamamoto, Takashi Amemiya, Tomohiko Yamaguchi
Learning and Recalling of Phase Patterns in Coupled BVP oscillators with Time Delay. Int. J. Bifurc. Chaos 17 (10) (2007)
Dongli Han, Yuhei Kato, Kazuaki Takehara, Tetsuya Yamamoto, Kazunori Sugimura, Minoru Harada
QA System Metis Based on Web Searching and Semantic Graph Matching. Intelligent Information Processing (2006)
Yuji Hatanaka, Takeshi Hara, Hiroshi Fujita, Masaru Aoyama, Hideya Uchida, Tetsuya Yamamoto
Automated analysis of the distributions and geometries of blood vessels on retinal fundus images. Medical Imaging: Image Processing (2004)
Yuji Hatanaka, Yusuke Sakakibara, Takeshi Hara, Hiroshi Fujita, Akira Aoyama, Tetsuya Yamamoto
Development of an automated method for detecting abnormal blood vessels on retinal images. CARS (2004)
K. Tagawa, Tetsuya Yamamoto, T. Igaki, S. Seki
An Imanishian genetic algorithm for the optimum design of surface acoustic wave filter. IEEE Congress on Evolutionary Computation (2003)
Masayuki Hirayama, Tetsuya Yamamoto, Osamu Mizuno, Tohru Kikuno
Analysis of Software Test Item Generation - Comparison between High Skilled and Low Skilled Engineers. Asian Test Symposium (2003)
Masayuki Hirayama, Tetsuya Yamamoto, Jiro Okayasu, Osamu Mizuno, Tohru Kikuno
Elimination of Crucial Faults by a New Selective Testing Method. ISESE (2002)
Masayuki Hirayama, Tetsuya Yamamoto, Jiro Okayasu, Osamu Mizuno, Tohru Kikuno
A Selective Software Testing Method Based on Priorities Assigned to Functional Modules. APAQS (2001)
Masayuki Hirayama, Jiro Okayasu, Tetsuya Yamamoto, Osamu Mizuno, Tohru Kikuno
Generating test items for checking illegal behaviors in software testing. Asian Test Symposium (2000)
Larry T. Chen, Leslee Xu, Tatsuya Suda, Tetsuya Yamamoto, Koji Obinata
Reflective object-oriented distributed system for heterogeneous multimedia environments. Comput. Commun. 19 (8) (1996)
Larry T. Chen, Leslee Xu, Tatsuya Suda, Tetsuya Yamamoto, Koji Obinata
A reflective object-oriented distributed system for heterogeneous multimedia environments. ICCCN (1995)
Goro Suzuki, Tetsuya Yamamoto, Kyoji Yuyama, Kotaro Hirasawa
MOSAIC: a tile-based datapath layout generator. ICCAD (1992)
Tetsuya Yamamoto, Yoshikazu Ohta, Yoichi Yamashita, Riichiro Mizoguchi
Dialog management system mascots in speech understanding system. ICSLP (1990)

Tetsuya Yamamoto.css-eqlu8i{font-size:small;padding-left:4px;}

Publication Activity (10 Years)

Top Topics

Top Venues

Tetsuya Yamamoto