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Photonics and Microwave Engineering

Professor
Isao IYODA
[Power and Energy Conversion Lab.]

Specialties;

Power System Analysis, Power Electronics Equipment for Power System

Professional Experience;

Prof. Iyoda graduated from Kyoto University and joined Mitsubishi Electric Corp. in 1975.
He has been engaged in researches of power electronics, simulator, power system analysis and power system planning for 30 years.
He joined Osaka Prefectural College of Technology in 2005, and joined Osaka Electro-Communication University in 2009. He teaches Electrical Engineering in Power System and Power Electronics.

Isao IYODA

Research Subjects;

1. Effect of Voltage Sags in Inverters of PV Systems
Power electronics equipment is vulnerable for voltage sags of power system voltage.
Lost of generation power of distributed generations by the voltage dag might cause entire black out in future power system.
Effects of the sags are evaluated by experimental studies using a voltage sags generator.
This work was supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture of Japan (Basic research-C:18560292 and C: 20560284).

2. Real time simulation of power systems
Real time simulation is important in power system analysis especially for studies of new power electronics equipment in smart grid.
Using real time simulator, RT-LAB , modeling of power system is studied.
This work was supported by Power Academy foundation in 2010.

Isao IYODA
Isao IYODA

Associate Professor
Satoshi EBIHARA

Research Fields;

Ground penetrating radar

Satoshi EBIHARA

Introduction of laboratory;

Borehole radar is one form of ground penetrating radar.
Our research subject is related to the borehole radar system. In the system, the frequency band between 20 and 300 MHz is usually used.
Most conventional borehole radar systems use two vertical dipole antennas, which are omnidirectional.
In order to estimate objects such as fractures and faults in 3-D space with a single borehole, we are developing directional borehole radar.

Laboratory's WEB site

Satoshi EBIHARA
Satoshi EBIHARA

Professor
Akira KOMIYAMA

Research field;

Electromagnetic wave theory




Akira KOMIYAMA

Research theme;

In a disordered atomic system where the energy changes randomly from atom to atom wavefunctions for electrons are localized and concentrated into a narrow region of space.
In a disordered waveguide system composed of randomly different cores in size the same phenomenon takes place. Light propagates along a single core and does not almost leak out into neighbouring cores (see the figure above).
In a waveguide system where core sizes change randomly along the waveguide axis light diffuses (see the figure below).
His research interest is in physical and mathematical mechanisms of the localization and diffusion of light in waveguide systems.

Akira KOMIYAMA
Akira KOMIYAMA

Professor
Yoshiaki SHIBAGAKI

Research field;

Radar remote sensing

Biography;

Yoshiaki Shibagaki received the Ph.D. degree in communication engineering from Osaka Electro-Communication University in 1997.
After working as a research fellow PD of the Japan Society for the Promotion of Science (JSPS) in Kyoto University, he joined Department of Telecommunication Engineering, Osaka Electro-Communication University in 1999.
He is currently a Professor of applied radio wave engineering including remote sensing techniques.
He is a Member of the Meteorological Society of Japan and the IEICE.

Yoshiaki SHIBAGAKI

Introduction of my laboratory;

Convective precipitation systems associated with Baiu front and typhoon, generate heavy rainfall in some local areas over Japan Islands.
In our laboratory we have investigated the development and organization mechanisms of such convective precipitation systems mainly based on observations of VHF-band atmospheric radar, wind profiler, and meteorological radar.

Laboratory's WEB site

Yoshiaki SHIBAGAKI

Professor
Yasuyuki MAEKAWA

Research Field;

Radio wave propagation, Satellite communication, Radar engineering

Biography;

Yasuyuki Maekawa received the B.S., M.S., and Ph.D. degrees in electro-nics engineering from Kyoto University in 1979, 1981, and 1985, respectively.
His research activities are concerned with microwave and millimeter wave propagation on the earth-space paths and meteorological radar observations of the atmosphere.
Dr. Maekawa is a Member of Institute of Electronics, Information, and Communication Engineers (IEICE), Institute of Electrical and Electronics Engineers (IEEE), the Society of Geomagnetism and Earth, Planetary and Space Science, and the Meteorological Society of Japan.

Yasuyuki MAEKAWA

Introduction of laboratory;

This laboratory has been observing the effects of meteorological phenomena, such as rainfall or clouds, on the microwave and millimeter-wave propagation paths of satellite communications for a long time, using the experimental equipments of the Institute of Satellite Communication Research in our university.
The continuous data bases for rain attenuation of the satellite radio-wave signals and 1-min rainfall rate of rain gauges accumulated for more than 25 years are very important in this research field and not found in other places all over the world.
Recently, the rain attenuation data of satellite signals are also measured in Kyoto and Shiga prefecture, together with Southeast Asia in the equatorial region.
The performance and efficiency of satellite communication network operation in rain time are estimated among these adjacent cities near Osaka, and the differences of radio- wave propagation conditions are investigated between Japan in the temperate zone and Southeast Asia in the tropical zone.

Laboratory's WEB site

Yasuyuki MAEKAWA
Yasuyuki MAEKAWA

Professor
Katsumi MORISHITA
[Optical Fiber Technology Laboratory]

Research Fields;

Optical Fiber, Fiber-Based Optical Devices, Optical Devices

Education;

Ph. D. degree in Electrical Communication Engineering from Osaka University

Research Experience;

Dr. Morishita has been doing original researches in the fields of fiber optics and fiber-based optical devices, including fibers for optical devices, refractive-index profile measurements of optical waveguides, and fabrication techniques of fiber-based optical devices.

Membership of Academic Societies;

Fellow of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan Senior Member of the Institute of Electrical and Electronics Engineers (IEEE) Adviser to the IEICE Technical Committee of Optical Fiber Technologies

Katsumi MORISHITA

Research Activities;

Optical devices are necessary to build optical communication system, optical sensor system, and optical signal processing system.
Especially, fiber-based optical devices offer inherent advantages, such as low loss, ease of fiber attachment, stability, low material costs, and the potential for low cost.
Experimental and theoretical research works are made to realize various fiber-based optical devices.
Fabrication techniques and methods for measuring optical waveguide properties are developed to achieve fiber-based devices.

The photos show fabrications of arc-induced fiber gratings and fused fiber couplers, respectively.

Laboratory's WEB site

Katsumi MORISHITA
Katsumi MORISHITA

Associate Professor
Yiwei HE
[Laboratory of Communication Systems]

Research Area;

Electromagnetic Engineering, Numerical Electromagnetics




Yiwei HE

Introduction;

We are working on the methodology of numerical electromagnetics.
We are also intensively studying the inverse problem on how to estimate the shapes, electrical properties of the objects from their scattering fields.

In our laboratory, we are solving the electromagnetic problems by using computational analysis.
In addition to the study of methodology of numerical analysis, we performed the numerical analysis to various practical electromagnetic problems, such as the optical disc and antennas.
The photograph shows the Luneberg lens that was analyzed by using FDTD method in our laboratory.
The Luneberg lens antennas that were developed with the aid of numerical analysis were widely used in Radar and satellite communication systems.

We are also developing the penetrating Radar to detect not only the depth, but also the shape and material property.
In order to improve the performance of the radar, we are developing wideband transmitting and receiving antennas, and improving the signal processing algorithms.
The figure in left side shows the Radar echo due to the three buried pipes, and the figure in the right side shows the echo of a single pipe extracted by means of the migration method.

Laboratory's WEB site

Yiwei HE
Yiwei HE