Department of Electrical and Communication Engineering

As of March 2018

Applied Superconductivity Engineering Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~ase/)

SeokBeom KIM, Professor

Hiroshi UEDA, Associate Professor

Research Themes:

  • Fabrication of Superconducting Motor/Generator Using High Temperature Superconducting (HTS) Wires
  • Development of Compact NMR/MRI Magnets Using HTS Bulks and Wires
  • Developments of 3-D Superconducting Actuator and a Non-Contact Levitation System Using HTS Bulks
  • Medical Application of HTS Magnet
  • Development of Numerical Simulation Technique for HTS Application and Electrical Equipment

Representative Publication :

  • SeokBeom Kim, Katusya Hojo and Daiki Miyazawa, “Study on the Magnetic Field Homogeneity of HTS Bulk Magnets Including the Degraded HTS Bulk for Developing the Compact NMR Relaxometry,” IEEE Trans. on Applied Superconductivity, Vol. 26, No. 4, 4302104, January 2016.
  • Hiroshi Ueda, Yohei Imaichi, Tao Wang, Atsushi Ishiyama, So Noguchi, Sadanori Iwai, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, and Hidenao Fukuyama, “Numerical Simulation on Magnetic Field Generated by Screening Current in 10-T-Class REBCO Coil,” IEEE Trans. on Applied Superconductivity, Vol. 26, No. 4, 4701205, June 2016.

Electric Power Conversion System Engineering Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~epc/en/index.html)

Eiji HIRAKI, Professor

Nozomu NANATO, Associate Professor

Kazuhiro UMETANI, Assistant Professor

Research Themes:

  • Protection and Diagnosis of Superconducting Magnets
  • Compact and High Efficiency AC Power Supply with a Single Phase
    Superconducting Transformer
  • Wireless Power Transfer Systems / High Frequency Induction Heating
  • Innovative SRM Drive for EVs

Representative Publication :

  • Tomohide Shirakawa, Genki Yamasaki, Kazuhiro Umetani and Eiji Hiraki, “Extremum Co-Energy Principle for Analyzing AC Current Distribution in Parallel-Connected Wires of High-Frequency Power Inductors,” IEEJ Journal of Industry Applications, Vol. 7, No.1, pp.35-42, Jan. 2018
  • Kazuhiro Umetani, Kyota Aikawa and Eiji Hiraki, “Straightforward Measurement Method of Common Source Inductance for Fast Switching Semiconductor Devices Mounted On-board,” IEEE Transactions on Industrial Electronics, Vol. 64, Issue 10, pp.8258-8267, Oct. 2017
  • Nozomu Nanato, Noriyuki Kishi, Yuhi Tanaka and Mikishi Kondo, “Basic study for a large AC current supply with a single phase air-core Bi2223 high temperature superconducting transformer,” Journal of Physics: Conference Series, Vol. 871, 012101, 2017

Power System Control Engineering Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~psc/index.html)

Shigeyuki FUNABIKI, Professor

Jun IMAI, Associate Professor

Akiko TAKAHASHI, Assistant Professor

Research Themes:

  • Voltage Control Methods in Distribution Systems with a Large Number of PV Systems
  • Optimal Allocation of FACTS in a High-Voltage Distribution System
  • Measuring Methods for Solar Irradiance Based on Image Analyses
  • Active Vibrating Control of Robot Arms: Digital Real Time Implementation
  • Temperature Profile Control of Blast Furnaces: Sensor Optimal Location

Representative Publication :

  • Akiko Takahashi, Akihiro Yamagata, Jun Imai and Shigeyuki Funabiki, “Decomposition of Fluctuating Photovoltaic Generation Power in Frequency Bands and Analysis of Chaotic Properties,” Electrical Engineering in Japan, Vol. 201, No. 4, pp. 26-33, December 2017.
  • Akiko Takahashi, Hiroaki Morio, Jun Imai and Shigeyuki Funabiki, “An Estimation Method for Solar Radiation Intensity Using Web Camera,” Journal of the Japan Institute of Energy, Vol. 94, No. 11, pp. 1330-1336, November 2015.
  • Jun Imai, Katsuyuki Noso, Akiko Takahashi, and Shigeyuki Funabiki, “On Mixed Galerkin Modeling for Controller Design of Boundary Control Systems,” IFAC-PapersOnLine, Vol.50, Issue 1, pp. 7133-7138, 2017.

Advanced Electro Measurement Technology Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~sense/)

Keiji TSUKADA, Professor

Toshihiko KIWA, Associate Professor

Kenji SAKAI, Assistant Professor

Research Themes:

  • Highly Sensitive Magnetic Measurement System
  • Non-Destructive Evaluation by a Magnetic Method
  • Gas and Ion Sensing System
  • Terahertz Measurement System

Representative Publication :

  • Keiji Tsukada, Yatsuse Majima, Yoshihiro Nakamura, Takuya Yasugi, Nangnang Song, Kenji Sakai, and Toshihiko Kiwa, “Detection of inner cracks in thick steel plates using unsaturated AC magnetic flux leakage testing with a magnetic resistance gradiometer”, IEEE TRANSACTIONS ON MAGNETICS, Vol. 53, No. 11, 2501305, Nov. 2017
  • Takuya Kuwana, Masahiro Ogawa, Kenji Sakai, Toshihiko Kiwa and Keiji Tsukada, “Label-free detection of low-molecular-weight samples using a terahertz chemical microscope”, Applied Physics Express, Vol. 9, No. 4, 042401, March 2016
  • Kenji Sakai, Tsubasa Kizu, Toshihiko Kiwa and K. Tsukada, “Magnetic AC impedance analysis method using high-Tc SQUID based magnetic measurement system”, IEEE Transactions on Applied Superconductivity, Vol. 27, No. 4, 1601205, July 2017

Nanodevice and Materials Engineering Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~dm/index_e.html)

Yasuhiko HAYASHI, Professor

Yoshifumi YAMASHITA, Associate Professor

Takeshi NISHIKAWA, Assistant Professor

Masaki HADA, Assistant Professor

Research Themes:

  • Advanced Nanocarbon Materials & Devices, Organic Electronics Materials & Devices
  • Defect Properties and Engineering in Semiconductor Crystals
  • Material Processing by Atmospheric Pressure Plasmas
  • Photoinduced Structural Dynamics of Functional Materials Explored with Femtosecond Electron Diffraction and Optical Spectroscopy

Representative Publication :

  • Masaki Hada, Yoichi Hasegawa, Ryota Nagaoka, Tomoya Miyake, Ulugbek Abdullaev, Hiromi Ota, Takeshi Nishikawa, Yoshifumi Yamashita and Yasuhiko Hayashi, ” In-situ X-ray diffraction reveals the degradation of crystalline CH3NH3PbI3 by water-molecule collisions at room temperature” Jpn. J. Appl. Phys. 57, 028001 (2018).
  • Yoshifumi Yamashita, Ryu Nakata, Takeshi Nishikawa, Masaki Hada, and Yasuhiko Hayashi, “Expansion of Shockley stacking fault observed by scanning electron microscope and partial dislocation motion in 4H-SiC,” J. Appl. Phys. 123, 161580 (2018).
  • Masaki Hada, Shohei Saito, Sei’ichi Tanaka, Ryuma Sato, Masahiko Yoshimura, Kazuhiro Mouri, Kyohei Matsuo, Shigehiro Yamaguchi, Mitsuo Hara, Yasuhiko Hayashi, Fynn Röhricht, Rainer Herges, Yasuteru Shigeta, Ken Onda, R. J. Dwayne Miller, ” Structural Monitoring of the Onset of Excited-State Aromaticity in a Liquid Crystal Phase” J. Am. Chem. Soc. 139, 15792–15800 (2017).

Multiscale Device Design (Tsuruta) and Microwave Circuit (Sanagi) Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~mdd/index.html)

(URL:http://www.ec.okayama-u.ac.jp/~micro/index.html)

Kenji TSURUTA, Professor

Minoru SANAGI, Associate Professor

Atsushi ISHIKAWA, Assistant Professor

Research Themes:

  • Ab-Initio/Multiscale Computational Design of Energy-Harvesting Nanomaterials/Nanodevices
  • Phononic Crystals and Acoustic Metamaterials for Energy Harvesting Systems
  • Plasmonic Metamaterials for Optical Functional Devices
  • Microwave Multiple-Port Power Divider/Combiner
  • Efficient Microwave-DC Interconversion

Representative Publication :

  • A. Ishikawa, S. Hara, T. Tanaka, Y. Hayashi, and K. Tsuruta, "Cross-Polarized Surface-Enhanced Infrared Spectroscopy by Fano-Resonant Asymmetric Metamaterials," Scientific Reports Vol. 7, pp. 3205-1-8, June 2017.
  • Y. Iwasaki, K. Tsuruta, and A. Ishikawa, "Rectification of Lamb wave propagation in thin plates with piezo-dielectric periodic structures," Japanese Journal of Applied Physics Vol. 55, pp. 07KB02-1-4, May 2016.
  • M. Sanagi, J. Fujiwara, K. Fujimori, and S. Nogi, "Beam Control in Unilaterally Coupled Active Antennas with Self-oscillating Harmonic Mixers,"IEICE Trans. Electron., Vol.E88-C, No.7, pp.1375-1381, July 2005.

Optoelectronic and Electromagnetic Wave Engineering

(URL:http://www.ec.okayama-u.ac.jp/~opt/index.html)

Hideki FUKANO, Professor

Kazuhiro FUJIMORI, Associate Professor

Shuji TAUE, Assistant Professor

Research Themes:

  • Optical Fiber Sensors
  • Optically Powered Sensor
  • Study of Wireless Power Transmission
  • Study of Antenna

Representative Publication :

  • Hideki Fukano, Daichi Watanabe, and Shuji Taue, “Sensitivity characteristics of multimode-interference optical-fiber temperature-sensor with solid cladding material,” IEEE Sensors Journal, Vol. 16, No. 24, pp. 8921-8927, 2016.
  • Shuji Taue, Tsuyoshi Takahashi, and Hideki Fukano, “Coating-free reflection technique for fiber-optic sensors based on multimode interference: a temperature-sensing study,” Jpn. J. Appl. Phys., Vol. 55, 08RE03, 2016.

Information Transmission Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~trans/)

Nobumoto YAMANE, Associate Professor

Research Themes:

  • Medical Image Processing and Diagnostic Imaging
  • Earth Quake Prediction
  • Multi-media Signal Processing and Compression

Representative Publication :

  • Hirofumi Inoue, Nobumoto Yamane and Hisao Oka “An Automatic Visual Inspection Method Based on Supervised Machine Learning for Rapid On-Site Evaluation in EUS-FNA,” IEEE Society of Instruction and Control Engineers (CISE 2014), September 2014.

Information System Design Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~infsys/index_en.html)

Hiroto KAGOTANI, Senior Assistant Professor

Research Themes:

  • Design Methods of Asynchronous Processors
  • Reconfigurable Computer Architecture
  • General Purpose Computing on GPU
  • Secure Cryptographic Hardware Implementation

Representative Publication :

  • Hiroto Kagotani, Yuji Sugiyama, Takuya Okamoto “An Efficient Algorithm to Determine Equivalence of Pipelined Dependency Graphs for Their Simplification,” IEICE Transactions on Information and Systems, Vol. J100-D, No. 6, pp. 616-626, June 2017.

Computer Networks and Medical Information Laboratory

Research Themes:

  • Highly Distributed Cloud Computing Environment
  • Design of Virtual Networks
  • Technologies to Improve the Performance of Internet Communication Protocols
  • Technologies to Treat Medical Information

Representative Publication :

  • Shigeyuki Osada, Ryo Miyayama, Yukinobu. Fukushima, and Tokumi Yokohira, “TCP Incast Avoidance Based on Connection Serialization in Data Center Networks,” International Journal of Computer Networks and Communications, Vol. 8, pp. 83-102, July 2016.
  • Yukinobu Fukushima, Tutomu Murase, Gen Motoyoshi, Tokumi Yokohira, and Tatsuya Suda, “Determining Server Locations in Server Migration Service to Minimize Monetary Penalty of Dynamic Server Migration,” Journal of Network and Systems Management, 41 pages, 2018.

Mobile Communications Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~mob/index_eng.htm)

Kazuhiro UEHARA, Professor

Shigeru TOMISATO, Associate Professor

Research Themes:

  • LED Visible Light Wireless Communications
  • Radio Propagation Modeling for Transmission Paths between Underground and Ground
  • Non-Linear Distortion Noise Reduction in Multi-Band OFDM Transmission
  • Signal Separation Method for Sensor Terminals by Accumulation Batch Signal Processing

Representative Publication :

  • Takahiro Chikamori, Shigeru Tomisato, Satoshi Denno, Kazuhiro Uehara, “Transmission Quality Improvement by LED Back-off Optimization for Visible Light Wireless Communications,” Proc. of the 20th International Symposium on Wireless Personal Multimedia Communications (WPMC 2017), pp. 228-232, Dec. 2017.

Information Security Laboratory

(URL:http://isec.ec.okayama-u.ac.jp/home/)

Yasuyuki NOGAMI, Professor

Takuya KUSAKA, Senior Assistant Professor

Research Themes:

  • Elliptic Curve Cryptography
  • Error Correction Code
  • Lattice-Based Cryptography
  • Discrete Mathematics
  • IoT Security

Representative Publication :

  • Takuya Kusaka, Sho Joichi, Ken Ikuta, Md. Al-Amin Khandaker,, Yasuyuki Nogami, Satoshi Uehara, Nariyoshi Yamai, and Sylvain Duquesne, “Solving 114-bit ECDLP for a Barreto-Naehrig Curve,” The 20th Annual International Conference on Information Security and Cryptology (ICISC2017), 2017.

Multimedia Radio Systems Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~wcs/)

Satoshi DENNO, Professor

Yafei HOU, Assistant Professor

Research Themes:

  • Random Access Techniques for Spatial Multiplexing in Wireless Local Area Networks
  • Physical Layer Network Coding in Wireless Bidirectional Relaying Systems
  • Noise Cancellation Techniques for Electric Vehicles
  • Machine learning for cognitive radio
  • Signal process and applications, Radio over fiber

Representative Publication :

  • Cao Lengchi and Satoshi Denno, “Nonlinear Precoding for XOR Physical Layer Network Coding in Bi-directional MIMO Relay Systems,” IEICE Trans. Commun., Vol.E100-B, No.3, pp.440-448, Mar. 2017.
  • Satoshi Denno and Yusuke Murakami, “Uplink Multiuser MIMO Access With Probe Packets in Distributed Wireless Networks,” IEICE Trans. Commun., Vol.E101-B, No.6, 2018.

Distributed System Design Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~dist/index_eng.html)

Nobuo FUNABIKI, Professor

Minoru KURIBAYASHI, Associate Professor

Research Themes:

  • Java Programming Learning Assistant System
  • Desktop Grid Computing System
  • Elastic Wireless LAN System
  • Digital Watermarking and its Applications
  • Design of Aesthetic QR Code

Representative Publication :

  • M. Kuribayashi and N. Funabiki, “Universal scoring function based on bias equalizer for bias-based fingerprinting codes,” IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, Vol.E101-A, No.1, pp.119-128, January 2018.

Optical and Electromagnetic Waves Laboratory

(URL:http://www.ec.okayama-u.ac.jp/~oew/index_en.html)

Yoshitaka TOYOTA, Professor

Kengo IOKIBE, Assistant Professor

Research Themes:

  • Electromagnetic Compatible Design of Electrical and Electronic Devices and Systems
  • Control of Electromagnetic Wave Propagation by Periodic Structure
  • Measurement, Modeling and Simulation of EMC Characteristics of Semiconductor Devices
  • Countermeasures Against Side-channel Attacks on Cryptographic Devices

Representative Publication :

  • Yoshitaka Toyota, Shohei Kan, Kengo Iokibe, “Suppression of Mode Conversion by Using Tightly Coupled Asymmetrically Tapered Bend in Differential Lines,” IEICE Transactions on Communications, Vol. E98-B, No. 7, pp. 1188-1195, July 2015.
  • Kengo Iokibe, Tetsuo Amano, Kaoru Okamoto and Yoshitaka Toyota, “Equivalent Circuit Modeling of Cryptographic Integrated Circuit for Information Security Design,” IEEE Transactions on Electromagnetic Compatibility, Vol. 55, No.3, pp. 581-588, June 2013.

Network Systems Laboratory

(URL:TBD)

Yukinobu Fukushima (Associate Professor)

Research Themes:

  • Highly Distributed Cloud Computing Environment
  • Design of Virtual Networks
  • Design of Optical Networks
  • Knowledge-Defined Networking

Representative Publication :

  • Yukinobu Fukushima, Wenjie Chen and Tokumi Yokohira, “A Trail Multi-Splitting Method for Throughput Improvement in Light Trail Networks,” Photonic Network Communications, Vol. 30, pp. 178-189, May 2015.
  • Yukinobu Fukushima, Tutomu Murase, Gen Motoyoshi, Tokumi Yokohira, and Tatsuya Suda, “Determining Server Locations in Server Migration Service to Minimize Monetary Penalty of Dynamic Server Migration,” Journal of Network and Systems Management, 41 pages, 2018.