NUEE Department of Electrical Engineering, Electronics,and Information Engineering,School of Engineering, Nagoya University Department of Electrical Engineering,Department of Electronics, and Department of Information and Communication Engineering,Graduate School of Engineering,Nagoya University

NEWS
2019
009

Realization of a liquid-crystalline structure of magnetic vortices

Magnetic vortices -skyrmions- show the arrays analogous to atomic arrays of solid states. The researchers of Nano-Electronic Materials Laboratory has found a liquid-crystalline structure of skyrmions, using Lorentz transmission electron microscopy. This finding may provide a new avenue for next-generation spintronics devices.

Details are here

a liquid-crystalline structure of skyrmions
2019
008

Research on information security and cryptography

Tetsu Iwata's research group and partners including NEC identified serious security vulnerabilities in the ISO/IEC standard authenticated encryption OCB2. Given the results, ISO/IEC announced the removal of OCB2 from the international standard. The paper describing the vulnerabilities and also proposes ways to fix the issues was presented at CRYPTO 2019, and received the Best Paper award. This work gives useful insight to design secure and efficient authenticated encryption schemes.

Details are here

Overview of the plaintext recovery attack

Overview of the plaintext recovery attack

Announcement of ISO/IEC to remove OCB2 from ISO/IEC19772:2009-02

2019
007

Establishment of the center for Low-temperature Plasma Sciences (cLPS)

Ceremony, commemorative lectures and facility tour to commemorate the establishment of the center for Low-temperature Plasma Sciences (cLPS) were held on July 23 were held on July 23, 2019. Over 550 participants from universities, reserch institutes, and companies were attended.

2019
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.

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.

2019
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

Figure (left) Power Conversion System applying GaN MOS-FET, (right) Comparative data of High Frequency Operation between GaN MOS-FET and SiC MOS-FET

2019
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.

Prof. Kazuo Shiokawa at the inauguration statement.

2019
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

Multi-modal Communication Enabled Autonomous Vehicle

Multi-modal Communication Enabled Autonomous Vehicle

2019
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).

(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.
2019
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.

(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.

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.

2018
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 (Upper left: wearable assistive robots fitting to the human body surface, Lower left: Advantage of control system feedbacking contact force distribution, Upper right: developed fabric-type actuator and its motions, Lower right: control to follow the human complex motions)
2018
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

(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

2018
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).

(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).

2018
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

Early Detection of Symptoms of Dementia is challenged by measuring EEG (Electroencephalogram).
2018
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.

We have succeeded in the real-time terahertz spectroscopy and fast spectroscopic imaging system using multi-wavelength terahertz parametric generation and detection technique.

2018
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.

molecular dynamics simulation

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.

2018
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

Todai Robot Project
2018
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.)

Microphotograph of demonstrated microprocessor (Fabricated with the AIST process.)

2018
003

The highest superconducting property at liquid nitrogen temperature was achieved by introduction of well-aligned artificial pinning centers into high temperature superconducting films.

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(a) plan-view and (b) cross-sectional transmission electron microscopy in RE-based high temperature superconducting films with well-aligned artificial pinning centers.

(a) plan-view and (b) cross-sectional transmission electron microscopy in RE-based high temperature superconducting films with well-aligned artificial pinning centers.

2018
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

Success of non-destructive deep imaging of mouse brain using 1.7 um OCT/OCM
2018
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

A scanning electron microscope micrograph of a part of large-scale fuzzy structure.

Fig : A scanning electron microscope micrograph of a part of large-scale fuzzy structure.

2017
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)

2017
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

2017
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

 Fabrication of permittivity graded material (ε-FGM) for gas-insulated switchgear spacers

Fig : Fabrication of permittivity graded material (ε-FGM) for gas-insulated switchgear spacers

2017
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

Upper limitation of deliverable power
2017
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

2017
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

2017
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

2017
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

Process Pipeline of 3-D Display System

Fig : Process Pipeline of 3-D Display System

2017
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

Magnet-free sputtering device using surface wave plasma with RF bias power

Fig : Magnet-free sputtering device using surface wave plasma with RF bias power

2017
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

2017
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

2017
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

2017
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

2017
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