Overview
Organizations
Research Fields
006
High resolution electron microscopy revealed atomic structure of defects in Mg doped GaN.
Atomic resolution structural analysis revealed that Mg impurity atoms (dopant) segregates at defects in GaN crystal and that the segregation determines the upper limits the free carrier density in p-type GaN. The results were reported in the journal, Appl. Phys. Express (vol 12, 031004 (2019)), and the article was selected as a spotlight article (editor-selected article).
This work was completed in collaboration with Toyota Central R&D Labs. Inc. and was supported by MEXT "Program for research and development of next-generation semiconductors to realize an energy-saving society."
High resolution electron micrograph of a Mg segregated defect in GaN. Ga atoms are observed as bright spots. Mg atoms segregate at dark atomic layer sandwiched by GaN crystals. Inset shows simulated image of the Mg segregated defect structure.
005
Power Electronics Laboratory have achieved 19MHz switching operation using GaN MOS-FET.
Collaboration Project between Power Electronics Laboratory in Nagoya University and TOYODA GOSEI Co., Ltd. has achieved 19MHz switching operation using GaN MOS-FET which is vertical GaN power device. GaN MOS-FET can operate two times higher switching transient as compared with SiC MOS-FET. Using this technique, the wireless power transfer system can expand 10 times power transfer distance in EV, PC and mobile phone applications.
Figure (left) Power Conversion System applying GaN MOS-FET, (right) Comparative data of High Frequency Operation between GaN MOS-FET and SiC MOS-FET
004
Kazuo Shiokawa (Electrical Engineering) was elected as the SCOSTEP President
During the SCOSTEP General Council Meeting held in July 13, 2019 in Montreal, Canada, Prof. Kazuo Shiokawa (Electrical Engineering) was elected as the SCOSTEP President for the next four years. The SCOSTEP (The Scientific Committee on Solar Terrestrial Physics) is an interdisciplinary body of the International Council for Science (ICSU, currently ISC). SCOSTEP runs international interdisciplinary scientific programs and promotes solar-terrestrial physics research by providing the necessary scientific framework for international collaboration and dissemination of the derived scientific knowledge in collaboration with other ICSU bodies. SCOSTEP is a permanent observer at the United Nations Committee on the Peaceful Uses of Outer Space (UNCOPUOS).
Prof. Kazuo Shiokawa at the inauguration statement.
003
Behavior Signal Processing Laboratory researches signal processing theory and creates new environment for human.
Behavior Signal Processing Laboratory researches signal processing theory such as machine learning methods, and develops application systems such as speech recognition, behavior understanding, autonomous driving, interaction, sports science and so on. We have realized a multi-modal communication enabled autonomous driving system that can operate the autonomous vehicle using voice, gesture and gaze.
Details are here
002
Researches on high-density memory and advanced sensor devices
At Iwata Laboratory of Department of Electronics, we have been developing the efficient way of the magnetization switching utilizing spin current, electric field, Joule heating, etc. Functional magneto-resistance sensor devices and nano-fabrication of the magnetic thin films for ultra high-density storage are also studied. These researches are quite important to transform society through the next-generation IoT (internet of Things).
Figure
- (a)Schematic and experimental result on the magnetization switching of GdFeCo by spin Hall effect.
- (b)Schematic and optical microscope image of domain wall displacement type magneto-resistance sensor device.
- (c)Schematic and magnetic force microscope image of bit patterned medium fabricated by ion irradiation.
001
Research of space plasma with the data analysis of satellites and computer simulations
Miyoshi Laboratory (Space Information Engineering group) has studied various phenomena in solar atmosphere and geospace such as solar flares, aurora and high energy electron accelerations using the data from the cutting-edge satellites Arase and Hinode. Moreover, the laboratory has studied space plasma processes with supercomputers.
Caption (a) Geospace exploration satellite “Arase” (© ERG Science Team), (b) Solar satellite “Hinode” (© ISAS/JAXA), (c) The CIDAS supercomputer system at the Institute for Space-Earth Environmental Research.
011
Development of wearable assistive systems that can contact softly and safely with wearers
Doki Laboratory of Department of Information and Communication Engineering develops wearable assistive systems taking safe and effective assists for wearers. Some prototypes of assistive robot and soft actuators are developed; robots enabling to detect contact force with wearers via tactile pressure sensors for ensuring safety, fabric-type actuators generating three-dimensional motions for assisting human naturals.
Examples of researches for safe and effective assist systems
010
pn diodes with GaN theoretical performance limit was demonstrated.
GaN power devices have attracted attention to realize an energy-saving society, but it was difficult to fabricate devices that showed sufficient breakdown voltage. In this research, we developed a fabrication technology of a Butte type structure that deeply and vertically etched GaN. By using this method, we succeeded in fabricating GaN vertical pn diodes with uniform electric field distribution and the breakdown voltage of the theoretical performance limit.
Details are here
(a) Schematic image of the Bute type GaN pn diode, (b) Cross sectionnal SEM image, (c), (d) Simulation result of electric field distribution, (e) Emission image by avalanche breakdown current, (f) Reverse direction J- Etching depth dependence of V characteristics
009
New longitudinal network observatories, which measure aurora and electromagnetic waves from geospace, have been developed
The Space Observation group has been installed high-sensitive cameras, magnetometers, and antennas at Russia, Canada, Alaska, Iceland, and Finland to monitor longitudinal extent of aurora and radio waves from geospace since 2016, in collaboration with the Arase satellite of JAXA. This project is named as PWING Project. A lot of scientific results have been obtained from this project.
Details are here
(Left) Observation sites of the PWING Project. The Pc1/EMIC waves were observed over 200-deg longitudes at the arrival of specific solar-wind structure called CIR on March 21, 2017. (top right) Interesting blue aurora was observed at that time at Husafell, Iceland (Shiokawa et al., GRL, 2018). (bottom right) Longitudinal distribution of oxygen ions in geospace around the earth (Nosé et al., GRL, 2018).
This work is supported by JSPS KAKENHI (JP 16H06286; 16H04057).
008
Early Detection of Symptoms of Dementia is challenged by measuring EEG (Electroencephalogram).
Furuhashi laboratory identified the model to estimate MMSE (Mini Mental State Examination) score using EEG data measured by a smart chair* equipped with non-contact magnetic sensor. It is expected that the possibility of dementia can be detected at an early stage while an elderly person living alone is relaxing with a smart chair every day.
*Under development in Sustainable Platform Research Group of Nagoya university COI (Center of Innovation)
Details are here
Details are here
007
Real-time Terahertz spectroscopy and fast spectroscopic imaging system using multi-wavelength terahertz parametric generation were newly developed.
Real-time terahertz spectroscopy and fast spectroscopic imaging system were succeeded using multi-wavelength terahertz parametric generation and detection technique. It can be used for illicit drug detection in a mail and nondestructive testing of the plastic product.
Details are here
Details are here
We have succeeded in the real-time terahertz spectroscopy and fast spectroscopic imaging system using multi-wavelength terahertz parametric generation and detection technique.
006
DNA damage by tritium disintegration was estimated qualitatively, using molecular dynamics simulation.
We estimate the DNA damage by disintegration of tritium to helium (beta decay) qualitatively using Molecular Dynamics (MD) simulation. In the simulation, we adopted telomere structure of the human DNA. Moreover, we replaced some hydrogen atoms in guanine of the telomere to helium atoms. Then we perfumed MD simulation and analyzed the DNA structure. From this simulation, we found that as the number of the replaced helium increases, the double helix structure of the telomere becomes more fragile.
Fig : As the initial configuration, some hydrogen atoms in guanine of the telomere are replaced to helium atoms (Gray balls). We performed MD simulation, and it is found that this replacement weakens the hydrogen bonding between DNA chains.
005
The book of Todai Robot Project was published from University of Tokyo Press
Sato-Matsuzaki Laboratory has conducted research on automatic solving university-entrance exam from 2013, as a member of Todai Robot Project. Our research results in three subjects, Japanese Language, Mathematics, and World History, are described in this book.
Details are here
004
Execution of Stored Programs in a Superconductor Single-Flux-Quantum Microprocessor with Embedded Memories was demonstrated at 50 GHz
We successfully executed programs stored in an instruction memory in a superconductor single-flux-quantum bit-serial, 8-bit microprocessor using 50 GHz clocks. This is the first demonstration of stored-program computing using non-semiconductor integrated circuits.
Details arehere
Details arehere
Microphotograph of demonstrated microprocessor (Fabricated with the AIST process.)
003
The highest superconducting property at liquid nitrogen temperature was achieved by introduction of well-aligned artificial pinning centers into high temperature superconducting films.
Details are here
(a) plan-view and (b) cross-sectional transmission electron microscopy in RE-based high temperature superconducting films with well-aligned artificial pinning centers.
002
Success of non-destructive deep imaging of mouse brain using 1.7 um OCT/OCM
Researcher in Nishizawa lab. in Dept. Electronics developed high resolution optical coherence tomography (OCT) / optical coherence microscopy (OCM) using wideband ultrashort pulse fiber laser source at 1.7 um for the first time. Using the developed system, they succeeded in the non-destructive measurement of deep part of mouse brain (hippocampus) with micrometer resolution.
Details are here
Details are here
001
Large-scale fuzzy metallic nanostructure processing method was newly developed.
Large-scale fiberform nanostructures can be developed on metal surfaces by additional precipitation of metallic particles together with He ion bombardment in plasmas.
Details are here
Fig : A scanning electron microscope micrograph of a part of large-scale fuzzy structure.
014
Toward the realization of reliable remote machine control: Cross-layer optimization of control and communication
Katayama Laboratory (Institute of Materials and Systems for Sustainability) of Department of Information and Communication Engineering has been conducting research in communication systems for reliable remote machine control, and has proposed cross-layer optimization schemes that achieve not only communication performance improvement but also control performance improvement as an entire system. We are working for further developments of this work partly supported by JSPS Grant-in-Aid for Young Scientists (B) under Grant 15K21071.
Details are listed below (Papers)
Details are listed below (International Conferences)
013
JOB OPENING (deadline of application: 29 June 2018)
Applications are invited for a Professor at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
012
Toward gas-insulated power apparatus for the next generation with functionally graded materials
Hayakawa Laboratory at the Department of Electrical Engineering has proposed to apply functionally graded materials (FGM) to the compact and advanced gas insulated power apparatus for next generation. Recently, we presented 2 papers on its effect of electric field relaxation and breakdown strength improvement at the international conferences, ISH2017 on high voltage engineering and CEIDP on electrical insulating materials. This research is on-going as a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO) which was approved and started this year.
Details are here
Fig : Fabrication of permittivity graded material (ε-FGM) for gas-insulated switchgear spacers
011
Formulated Representation for Upper Limitation of Deliverable Power in Low-Voltage DC Distribution System
The research group on electrical-energy conversion engineering (Prof. Y. Yokomizu) has derived the formulated representation for the upper limitation of a deliverable power in a direct-current distribution system, in view of the voltage-instability phenomenon occurring at a load terminal.
This achievement reveals one of the significant properties for the dc delivery system, supporting employment of the direct current delivery in various electric facilities.
Details are here
010
JOB OPENING (deadline of application: 30 September 2017)
Applications are invited for an Assistant Professor at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
009
JOB OPENING (deadline of application: 30 September 2017)
Applications are invited for an Assistant Professor at Research Group of Electrical Energy Conversion, Department of Electrical Engineering, Graduate School of Engineering, Nagoya University.
Details are here
008
JOB OPENING (deadline of application: 30 September 2017)
Applications are invited for an Associate Professor or Lecturer at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
007
We have developed a system that can display real 3-D objects on a layered 3-D display.
Visual Information Laboratory of Department of Information and Communication Engineering has developed an end-to-end system where images of real objects are taken from 25 different viewpoints, converted into a layer representation, and fed to their prototype 3-D display that is composed of three stacked LCD panels.
Their system provides not only binocular 3-D perception but also natural motion parallax along with the motion of the observer.
Details are here
Fig : Process Pipeline of 3-D Display System
006
Oxide Film Deposition by Magnet-free Sputtering Using Surface Wave Plasma
Plasma Electronics research group developed a magnet-free sputtering device by combining a surface wave plasma and RF bias power.
The efficiency of utilizing a sputtering target was improved as compared with the conventional magnetron sputtering and deposition of high-quality insulating film with good spatial uniformity was realized.
The technique is expected to be applied to next-generation MRAM manufacture.
Details are here
Fig : Magnet-free sputtering device using surface wave plasma with RF bias power
005
JOB OPENING (deadline of application: 30 September 2017)
Applications are invited for an Assistant Professor at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
004
JOB OPENING (deadline of application: 30 September 2017)
Applications are invited for an Assistant Professor at Research Group of Electrical Energy Conversion, Department of Electrical Engineering, Graduate School of Engineering, Nagoya University.
Details are here
003
JOB OPENING (deadline of application: 30 June 2017)
Applications are invited for an Associate Professor at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
002
JOB OPENING (deadline of application: 31 May 2017)
Applications are invited for an Assistant Professor at Department of Electronics Engineering, Graduate School of Engineering, Nagoya University.
Details are here
001
JOB OPENING (deadline of application: 30 June 2017)
Applications are invited for a Professor at Department of Electrical Engineering, Graduate School of Engineering, Nagoya University.
Details are here
