Koichi Ogawa

Publication Activity (10 Years)

Years Active: 1986-2023
Publications (10 Years): 9

Top Topics

Channel Capacity

Quantitative Evaluation

Multiple Input Multiple Output

Top Venues

IEICE Trans. Commun.

Vis. Comput. Ind. Biomed. Art

Publications

Nobukuni Hamamoto, Koichi Ogawa, Hiroshi Ueda, Masako Furukawa, Motonori Nakamura, Kazutsuna Yamaji
Analysis of Activity Logs of GakuNin LMS in the Use of the Information Security Course at Gunma University. KES (2023)
Keisuke Usui, Koichi Ogawa, Masami Goto, Yasuaki Sakano, Shinsuke Kyougoku, Hiroyuki Daida
Quantitative evaluation of deep convolutional neural network-based image denoising for low-dose computed tomography. Vis. Comput. Ind. Biomed. Art 4 (1) (2021)
Hideki Kirino, Kazuhiro Honda, Kun Li, Koichi Ogawa
A Waffle-Iron Ridge Guide with Combined Fast- and Slow-Wave Modes for Array Antenna Applications. IEICE Trans. Commun. (2) (2018)
Hideki Kirino, Kazuhiro Honda, Kun Li, Koichi Ogawa
Wavelength Analysis Using Equivalent Circuits in a Fast and Slow Wave Waffle-Iron Ridge Guide. IEICE Trans. Commun. (2) (2017)
Kazuhiro Honda, Takeshi Kitamura, Kun Li, Koichi Ogawa
Regression-Based Channel Capacity for the Evaluation of 2×2 MIMO Antennas. IEICE Trans. Commun. (2) (2017)
Kun Li, Keisuke Murata, Kazuhiro Honda, Koichi Ogawa
Bit-error-rate OTA testing of BAN antennas based on shadowing-fading hybrid effects. ISMICT (2016)
Kazuhiro Honda, Kun Li, Koichi Ogawa
Weighted-Polarization Wearable MIMO Antenna with Three Orthogonally Arranged Dipoles Based on RF Signal Processing. IEICE Trans. Commun. (1) (2016)
Naoki Honma, Kentaro Murata, Hiroshi Sato, Koichi Ogawa, Yoshitaka Tsunekawa
-Parameter. IEICE Trans. Commun. (1) (2016)
Kun Li, Kazuhiro Honda, Koichi Ogawa
Three-Dimensional Over-The-Air Assessment for Vertically Arranged MIMO Array Antennas. IEICE Trans. Commun. (1) (2016)
Kun Li, Kazuhiro Honda, Koichi Ogawa
Experiments of a polarization-controlled active antenna to enhance BAN on-body link in human dynamic channels. ISMICT (2015)
Kun Li, Kazuhiro Honda, Koichi Ogawa
Rice Channel Realization for BAN Over-The-Air Testing Using a Fading Emulator with an Arm-Swinging Dynamic Phantom. IEICE Trans. Commun. (4) (2015)
Koichi Ogawa, Noriaki Yoshiura
Network operational method by using software-defined networking for improvement of communication quality at disasters. APNOMS (2014)
Tsutomu Sakata, Atsushi Yamamoto, Koichi Ogawa, Hiroshi Iwai, Jun-ichi Takada, Kei Sakaguchi
A Spatial Fading Emulator for Evaluation of MIMO Antennas in a Cluster Environment. IEICE Trans. Commun. (10) (2014)
Kazuhiro Honda, Kun Li, Koichi Ogawa
Shadowing-Fading BER Characterization of a BAN Diversity Antenna Based on Statistical Measurements of the Human Walking Motion. IEICE Trans. Commun. (10) (2013)
Koichi Ogawa, Kazuhiro Honda
Effects of Received Power Imbalance on the Diversity Gain of a Digital TV MRC Array Antenna. IEICE Trans. Commun. (3) (2013)
Kun Li, Kazuhiro Honda, Koichi Ogawa
Shadowing-fading BER characterization of BAN antennas based on realistic walking models. ISMICT (2013)
Koichi Ogawa, Masahiko Sakata, Yu Li
Adaptive Noise Reduction of Scintigrams with a Wavelet Transform. Int. J. Biomed. Imaging 2012 (2012)
Masaru Kiyama, Hitoshi Iyatomi, Koichi Ogawa
Robust video-oculography for non-invasive autonomic nerve quantification. EMBC (2011)
Takuya Yamakawa, Koichi Ogawa, Hitoshi Iyatomi, Etsuo Kunieda
Feasibility evaluation of a motion detection system with face images for stereotactic radiosurgery. EMBC (2011)
Naotake Yamamoto, Naganori Shirakata, Daisuke Kobayashi, Koichi Ogawa
BAN Communication Quality Assessments Using an Arm-Waving Dynamic Phantom Replicating the Walking Motion of a Human. ICC (2011)
Gia Khanh Tran, Nguyen Dung Dao, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
Performance Analysis of MIMO Schemes in Residential Home Environment via Wideband MIMO Propagation Measurement. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (4) (2010)
Tsutomu Sakata, Atsushi Yamamoto, Koichi Ogawa, Jun-ichi Takada
MIMO channel capacity measurement in the presence of spatial clusters using a fading emulator. PIMRC (2009)
Hitoshi Iyatomi, Hiroshi Oka, M. Emre Celebi, Masahiro Hashimoto, Masafumi Hagiwara, Masaru Tanaka, Koichi Ogawa
An improved Internet-based melanoma screening system with dermatologist-like tumor area extraction algorithm. Comput. Medical Imaging Graph. 32 (7) (2008)
Atsushi Yamamoto, Koichi Ogawa, Tetsuo Horimatsu, Akihito Kato, Masayuki Fujise
Path-Loss Prediction Models for Intervehicle Communication at 60 GHz. IEEE Trans. Veh. Technol. 57 (1) (2008)
Toshifumi Nakatani, Koichi Ogawa
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. (6) (2008)
Hideki Kirino, Koichi Ogawa, Takeshi Ohno
A Variable Phase Shifter Using a Movable Waffle Iron Metal Plate and Its Applications to Phased Array Antennas. IEICE Trans. Commun. (6) (2008)
Atsushi Yamamoto, Koichi Ogawa, Hiroshi Shirai
Empirical Investigation of the LOS Propagation Characteristics on an Undulating Road for Millimeter Wave Inter-Vehicle Communication. IEICE Trans. Electron. (9) (2007)
Koichi Ogawa, Satoru Amari, Hiroshi Iwai, Atsushi Yamamoto
Effects of Received Power Imbalance on the Channel Capacity of a Handset MIMO. PIMRC (2007)
Toshifumi Nakatani, Koichi Ogawa
IM3 Cancellation Method Using Current Feedback Suitable for a Multi-Stage RFIC Amplifier. IEICE Trans. Electron. (6) (2007)
Atsushi Yamamoto, Toshiteru Hayashi, Koichi Ogawa, Kim Olesen, Jesper Ødum Nielsen, Naizheng Zheng, Gert Frølund Pedersen
Outdoor Urban Propagation Experiment of a Handset MIMO Antenna with a Human Phantom Located in a Browsing Stance. VTC Fall (2007)
Gia Khanh Tran, Nguyen Dung Dao, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
Performance Analysis of MIMO-OFDM Systems using Indoor Wideband MIMO Channel Measurement Data. VTC Spring (2006)
Hiroki Kawai, Koichi Ito, Masaharu Takahashi, Kazuyuki Saito, Takuya Ueda, Masayoshi Saito, Hisao Ito, Hisao Osada, Yoshio Koyanagi, Koichi Ogawa
Simple Modeling of an Abdomen of Pregnant Women and Its Application to SAR Estimation. IEICE Trans. Commun. (12) (2006)
Hitoshi Iyatomi, Hiroshi Oka, Masaru Tanaka, Koichi Ogawa
Automatic Identification of Shot Body Region from Clinical Photographies. AIPR (2006)
Shoichi Kajiwara, Atsushi Yamamoto, Koichi Ogawa, Akihiro Ozaki, Yoshio Koyanagi
Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes. IEICE Trans. Commun. (6) (2005)
Nobuhiro Haruta, Koichi Ogawa
Evaluation of iterative methods for aperture correction in SPECT. Systems and Computers in Japan 36 (2) (2005)
Nguyen Dung Dao, Hai-Yeow-Eugene Chua, Kei Sakaguchi, Kiyomichi Araki, Hiroshi Iwai, Tsutomu Sakata, Koichi Ogawa
Measurements on Area Coverage of 5GHZ Band MIMO-OFDM System in Residential Home Environment. PIMRC (2005)
Hitoshi Iyatomi, Hiroshi Oka, Masahiro Hashimoto, Masaru Tanaka, Koichi Ogawa
An Internet-based Melanoma Diagnostic System - Toward the Practical Application. CIBCB (2005)
Koichi Ogawa, Jin Ohta
Image reconstruction with a source space tree algorithm for Compton CT. Systems and Computers in Japan 34 (11) (2003)
Kazumitsu Kondo, Koichi Ogawa, K. Sakura
Extraction of the vertebral foramen of the third lumbar vertebra with snakes. ICIP (2) (2002)
Koichi Ogawa, Masahiro Takahashi
Selection of projection sets and order of calculation in ordered subsets expectation maximization method. Systems and Computers in Japan 33 (13) (2002)
Koichi Ogawa, Toshimitsu Matsuyoshi, Kenji Monma
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. 50 (3) (2001)
Koichi Ogawa, Toshimitsu Matsuyoshi
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. 50 (3) (2001)
Koichi Ogawa, Jin Ohta
Accurate image reconstruction with the source space tree algorithm (SSTA) for Compton CT. ICIP (1) (2001)
Kotoko Morikawa, Koichi Ogawa
Comparative Study on Statistical Image Reconstruction Combined with Modification of the Number of Projections. ICIP (2000)
Yoshiyuki Nyui, Koichi Ogawa, Etsuo Kunieda
Extraction of Arteriovenous Malformation with Factor Analysis. ICIP (2000)
Koichi Ogawa, Tomoki Uwano, Masao Takahashi
A shoulder-mounted planar antenna for mobile radio applications. IEEE Trans. Veh. Technol. 49 (3) (2000)
Hiroshi Urabe, Koichi Ogawa
Introduction of Ordered Subsets Algorithm to Maximum a posteriori Expectation Maximization Method. ICIP (3) (1998)
Atsuhisa Saito, Masato Nakajima, Koichi Ogawa
Optimum contrast enhancement using fuzzy sets. Systems and Computers in Japan 22 (11) (1991)
Koichi Ogawa, Atsuhisa Saito, Masato Nakajima, Yutaka Ando, Shozo Hashimoto
Regional adaptive histogram equalization using fuzzy sets. Medical Imaging: Image Processing (1990)
Ritsu Kusaba, Masato Nakajima, Koichi Ogawa, Shin'ichi Yuta, Tatsuru Morozumi
Attenuation correction method for single-photon emission ct without any additional data collection. Systems and Computers in Japan 18 (12) (1987)
Satoshi Iwata, Chiaki Yoshida, Masato Nakajima, Koichi Ogawa, Shin'ichi Yuta
Correction method for collimator effect of ECT. Systems and Computers in Japan 17 (4) (1986)
Satoshi Iwata, Masato Nakajima, Shin'ichi Yuta, Koichi Ogawa
-ray camera. Systems and Computers in Japan 17 (10) (1986)