Koichi Ogawa

53 papers B 7C 2Journal 32Unranked 12
YearRankTypeTitle / Venue / Authors
2025 J jnl
Comprehensive evaluation of pipelines for classification of psychiatric disorders using multi-site resting-state fMRI datasets.
Neural Networks
Yuji Takahara, Yuto Kashiwagi, Tomoki Tokuda, Junichiro Yoshimoto, Yuki Sakai, Ayumu Yamashita, Toshinori Yoshioka, Hidehiko Takahashi, Hiroto Mizuta, Kiyoto Kasai, Akira Kunimitsu, Naohiro Okada, Eri Itai, Hotaka Shinzato, Satoshi Yokoyama, Yoshikazu Masuda, Yuki Mitsuyama, Go Okada, Yasumasa Okamoto, Takashi Itahashi, Haruhisa Ohta, Ryu-ichiro Hashimoto, Kenichiro Harada, Hirotaka Yamagata, Toshio Matsubara, Koji Matsuo, Saori C. Tanaka, Hiroshi Imamizu, Koichi Ogawa, Sotaro Momosaki, Mitsuo Kawato, Okito Yamashita
2023 B conf
Analysis of Activity Logs of GakuNin LMS in the Use of the Information Security Course at Gunma University.
KES
Nobukuni Hamamoto, Koichi Ogawa, Hiroshi Ueda, Masako Furukawa, Motonori Nakamura, Kazutsuna Yamaji
2021 J jnl
Quantitative evaluation of deep convolutional neural network-based image denoising for low-dose computed tomography.
Vis. Comput. Ind. Biomed. Art
Keisuke Usui, Koichi Ogawa, Masami Goto, Yasuaki Sakano, Shinsuke Kyougoku, Hiroyuki Daida
2018 J jnl
A Waffle-Iron Ridge Guide with Combined Fast- and Slow-Wave Modes for Array Antenna Applications.
IEICE Trans. Commun.
Hideki Kirino, Kazuhiro Honda, Kun Li, Koichi Ogawa
2017 J jnl
Regression-Based Channel Capacity for the Evaluation of 2×2 MIMO Antennas.
IEICE Trans. Commun.
Kazuhiro Honda, Takeshi Kitamura, Kun Li, Koichi Ogawa
2017 J jnl
Wavelength Analysis Using Equivalent Circuits in a Fast and Slow Wave Waffle-Iron Ridge Guide.
IEICE Trans. Commun.
Hideki Kirino, Kazuhiro Honda, Kun Li, Koichi Ogawa
2016 — conf
Bit-error-rate OTA testing of BAN antennas based on shadowing-fading hybrid effects.
ISMICT
Kun Li, Keisuke Murata, Kazuhiro Honda, Koichi Ogawa
2016 J jnl
Channel Capacity Evaluation of MIMO Antenna Based on Eigenvalues of
IEICE Trans. Commun.
Naoki Honma, Kentaro Murata, Hiroshi Sato, Koichi Ogawa, Yoshitaka Tsunekawa
2016 J jnl
Three-Dimensional Over-The-Air Assessment for Vertically Arranged MIMO Array Antennas.
IEICE Trans. Commun.
Kun Li, Kazuhiro Honda, Koichi Ogawa
2016 J jnl
Weighted-Polarization Wearable MIMO Antenna with Three Orthogonally Arranged Dipoles Based on RF Signal Processing.
IEICE Trans. Commun.
Kazuhiro Honda, Kun Li, Koichi Ogawa
2015 — conf
Experiments of a polarization-controlled active antenna to enhance BAN on-body link in human dynamic channels.
ISMICT
Kun Li, Kazuhiro Honda, Koichi Ogawa
2015 J jnl
Rice Channel Realization for BAN Over-The-Air Testing Using a Fading Emulator with an Arm-Swinging Dynamic Phantom.
IEICE Trans. Commun.
Kun Li, Kazuhiro Honda, Koichi Ogawa
2014 J jnl
A Spatial Fading Emulator for Evaluation of MIMO Antennas in a Cluster Environment.
IEICE Trans. Commun.
Tsutomu Sakata, Atsushi Yamamoto, Koichi Ogawa, Hiroshi Iwai, Jun-ichi Takada, Kei Sakaguchi
2014 C conf
Network operational method by using software-defined networking for improvement of communication quality at disasters.
APNOMS
Koichi Ogawa, Noriaki Yoshiura
2013 J jnl
Effects of Received Power Imbalance on the Diversity Gain of a Digital TV MRC Array Antenna.
IEICE Trans. Commun.
Koichi Ogawa, Kazuhiro Honda
2013 J jnl
Shadowing-Fading BER Characterization of a BAN Diversity Antenna Based on Statistical Measurements of the Human Walking Motion.
IEICE Trans. Commun.
Kazuhiro Honda, Kun Li, Koichi Ogawa
2013 — conf
Shadowing-fading BER characterization of BAN antennas based on realistic walking models.
ISMICT
Kun Li, Kazuhiro Honda, Koichi Ogawa
2012 J jnl
Adaptive Noise Reduction of Scintigrams with a Wavelet Transform.
Int. J. Biomed. Imaging
Koichi Ogawa, Masahiko Sakata, Yu Li
2011 — conf
BAN Communication Quality Assessments Using an Arm-Waving Dynamic Phantom Replicating the Walking Motion of a Human.
ICC
Naotake Yamamoto, Naganori Shirakata, Daisuke Kobayashi, Koichi Ogawa
2011 — conf
Feasibility evaluation of a motion detection system with face images for stereotactic radiosurgery.
EMBC
Takuya Yamakawa, Koichi Ogawa, Hitoshi Iyatomi, Etsuo Kunieda
2011 — conf
Robust video-oculography for non-invasive autonomic nerve quantification.
EMBC
Masaru Kiyama, Hitoshi Iyatomi, Koichi Ogawa
2010 J jnl
Performance Analysis of MIMO Schemes in Residential Home Environment via Wideband MIMO Propagation Measurement.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Gia Khanh Tran, Nguyen Dung Dao, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
2009 B conf
MIMO channel capacity measurement in the presence of spatial clusters using a fading emulator.
PIMRC
Tsutomu Sakata, Atsushi Yamamoto, Koichi Ogawa, Jun-ichi Takada
2008 J jnl
A Low Distortion and Low Noise Differential Amplifier Suitable for 3G LTE Applications Using the Even- and Odd-Mode Impedance Differences of a Bias Circuit.
IEICE Trans. Electron.
Toshifumi Nakatani, Koichi Ogawa
2008 J jnl
A Variable Phase Shifter Using a Movable Waffle Iron Metal Plate and Its Applications to Phased Array Antennas.
IEICE Trans. Commun.
Hideki Kirino, Koichi Ogawa, Takeshi Ohno
2008 J jnl
An improved Internet-based melanoma screening system with dermatologist-like tumor area extraction algorithm.
Comput. Medical Imaging Graph.
Hitoshi Iyatomi, Hiroshi Oka, M. Emre Celebi, Masahiro Hashimoto, Masafumi Hagiwara, Masaru Tanaka, Koichi Ogawa
2008 J jnl
Path-Loss Prediction Models for Intervehicle Communication at 60 GHz.
IEEE Trans. Veh. Technol.
Atsushi Yamamoto, Koichi Ogawa, Tetsuo Horimatsu, Akihito Kato, Masayuki Fujise
2007 B conf
Effects of Received Power Imbalance on the Channel Capacity of a Handset MIMO.
PIMRC
Koichi Ogawa, Satoru Amari, Hiroshi Iwai, Atsushi Yamamoto
2007 J jnl
Empirical Investigation of the LOS Propagation Characteristics on an Undulating Road for Millimeter Wave Inter-Vehicle Communication.
IEICE Trans. Electron.
Atsushi Yamamoto, Koichi Ogawa, Hiroshi Shirai
2007 J jnl
IM3 Cancellation Method Using Current Feedback Suitable for a Multi-Stage RFIC Amplifier.
IEICE Trans. Electron.
Toshifumi Nakatani, Koichi Ogawa
2007 — conf
Outdoor Urban Propagation Experiment of a Handset MIMO Antenna with a Human Phantom Located in a Browsing Stance.
VTC Fall
Atsushi Yamamoto, Toshiteru Hayashi, Koichi Ogawa, Kim Olesen, Jesper Ødum Nielsen, Naizheng Zheng, Gert Frølund Pedersen
2006 — conf
Automatic Identification of Shot Body Region from Clinical Photographies.
AIPR
Hitoshi Iyatomi, Hiroshi Oka, Masaru Tanaka, Koichi Ogawa
2006 — conf
Performance Analysis of MIMO-OFDM Systems using Indoor Wideband MIMO Channel Measurement Data.
VTC Spring
Gia Khanh Tran, Nguyen Dung Dao, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
2006 J jnl
Simple Modeling of an Abdomen of Pregnant Women and Its Application to SAR Estimation.
IEICE Trans. Commun.
Hiroki Kawai, Koichi Ito, Masaharu Takahashi, Kazuyuki Saito, Takuya Ueda, Masayoshi Saito, Hisao Ito, Hisao Osada, Yoshio Koyanagi, Koichi Ogawa
2005 C conf
An Internet-based Melanoma Diagnostic System - Toward the Practical Application.
CIBCB
Hitoshi Iyatomi, Hiroshi Oka, Masahiro Hashimoto, Masaru Tanaka, Koichi Ogawa
2005 J jnl
Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes.
IEICE Trans. Commun.
Shoichi Kajiwara, Atsushi Yamamoto, Koichi Ogawa, Akihiro Ozaki, Yoshio Koyanagi
2005 J jnl
Evaluation of iterative methods for aperture correction in SPECT.
Syst. Comput. Jpn.
Nobuhiro Haruta, Koichi Ogawa
2005 B conf
Measurements on Area Coverage of 5GHZ Band MIMO-OFDM System in Residential Home Environment.
PIMRC
Nguyen Dung Dao, Hai-Yeow-Eugene Chua, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
2003 J jnl
Image reconstruction with a source space tree algorithm for Compton CT.
Syst. Comput. Jpn.
Koichi Ogawa, Jin Ohta
2002 — conf
Extraction of the vertebral foramen of the third lumbar vertebra with snakes.
ICIP (2)
Kazumitsu Kondo, Koichi Ogawa, K. Sakura
2002 J jnl
Selection of projection sets and order of calculation in ordered subsets expectation maximization method.
Syst. Comput. Jpn.
Koichi Ogawa, Masahiro Takahashi
2001 — conf
Accurate image reconstruction with the source space tree algorithm (SSTA) for Compton CT.
ICIP (1)
Koichi Ogawa, Jin Ohta
2001 J jnl
An analysis of the performance of a handset diversity antenna influenced by head, hand, and shoulder effects at 900 MHz .I. Effective gain characteristics.
IEEE Trans. Veh. Technol.
Koichi Ogawa, Toshimitsu Matsuyoshi
2001 J jnl
An analysis of the performance of a handset diversity antenna influenced by head, hand, and shoulder effects at 900 MHz .II. Correlation characteristics.
IEEE Trans. Veh. Technol.
Koichi Ogawa, Toshimitsu Matsuyoshi, Kenji Monma
2000 J jnl
A shoulder-mounted planar antenna for mobile radio applications.
IEEE Trans. Veh. Technol.
Koichi Ogawa, Tomoki Uwano, Masao Takahashi
2000 B conf
Comparative Study on Statistical Image Reconstruction Combined with Modification of the Number of Projections.
ICIP
Kotoko Morikawa, Koichi Ogawa
2000 B conf
Extraction of Arteriovenous Malformation with Factor Analysis.
ICIP
Yoshiyuki Nyui, Koichi Ogawa, Etsuo Kunieda
1998 — conf
Introduction of Ordered Subsets Algorithm to Maximum a posteriori Expectation Maximization Method.
ICIP (3)
Hiroshi Urabe, Koichi Ogawa
1991 J jnl
Optimum contrast enhancement using fuzzy sets.
Syst. Comput. Jpn.
Atsuhisa Saito, Masato Nakajima, Koichi Ogawa
1990 B conf
Regional adaptive histogram equalization using fuzzy sets.
Image Processing
Koichi Ogawa, Atsuhisa Saito, Masato Nakajima, Yutaka Ando, Shozo Hashimoto
1987 J jnl
Attenuation correction method for single-photon emission ct without any additional data collection.
Syst. Comput. Jpn.
Ritsu Kusaba, Masato Nakajima, Koichi Ogawa, Shin'ichi Yuta, Tatsuru Morozumi
1986 J jnl
Correction method for collimator effect of ECT.
Syst. Comput. Jpn.
Satoshi Iwata, Chiaki Yoshida, Masato Nakajima, Koichi Ogawa, Shin'ichi Yuta
1986 J jnl
Longitudinal ECT imaging using
Syst. Comput. Jpn.
Satoshi Iwata, Masato Nakajima, Shin'ichi Yuta, Koichi Ogawa