Researcher List

Laboratories in Department of Electronics and Information Systems Engineering

Software Systems Laboratory
Prof. Katsumi HARASHIMA

Large-scale fire simulation
Large-scale fire simulation

Our goal is to create an optimal social environment by generating artificial lifes as software agents on a computer and modeling the real problems of society with the concept of artificial life. Specifically, we model the constituent systems of the target problems (organisms, humans, etc.) as software agents, evolve each agent according to the environment, and reflect the behavior of the agent in the environment. By repeating this process and converging to a stable environment, we can evaluate the behavioral rules of the agents and the environment that has been formed.

Main Research Topics

  • Autonomous robot patrol system using drones
  • Simulation of evacuation behavior using software agents
  • Development of a porter-agent system

Information Communication Laboratory
Prof. ZHOU Hong

Student working on a wireless transmission experiment using the USRP software radio kit.
Student is conducting wireless transmission experiment using the USRP software radio kits.

The Internet of Things (IoT) is a key technology of the advanced information society of the 21st century. In IoT, not only individual human being, but also all kinds of things are connected to the Internet, enabling communication "anytime, anywhere, with anyone, and with any kind of information". Wireless communication, including cell phones and wireless LANs, is an indispensable technology for the realization of the IoT. However, the quality of ultra-high speed communication is significantly degraded due to the poor propagation environment of the communication channels for mobile and cellular communications and wireless LAN. On the other hand, ad-hoc/multi-hop wireless is a field that is expected to develop greatly in the future, as it can be used to build a network flexibly, quickly, and easily through autonomous distributed control of wireless terminals, and is useful for securing communication means between vehicles, temporarily, in emergencies, and in military situations. In this laboratory, we are conducting research in the fields of mobile communication, wireless LAN, and ad-hoc/multi-hop wireless networks, with a particular focus on communication systems and methods, with the aim of contributing to the realization of an IoT society.

Main Research Topics

  • Research on next-generation high-performance multi-hop wireless networks
  • Research on adaptive OFDM transmission systems
  • Application of neural networks to digital wireless communications
  • Research on advanced mobile wireless networks using ad hoc MIMO communication methods
  • Development of a porter-agent system

Functional System Device Laboratory
Prof. Kazuto KOIKE

Fig.1  Glucose detection characteristics of the enzyme-modified EGFET.
Fig.1 Glucose detection characteristics of the enzyme-modified EGFET.
Fig.2  Glucose detection range of the enzyme-modified EGFET.
Fig.2 Glucose detection range of the enzyme-modified EGFET.
Ref.) K. Koike, M. Yano et al., Biosensors 2020, 10, 57.

Main Research Topic

Development of FET-type biosensors

Biomedical sensors to detect various human health markers from a small droplet of blood are developed. We have been studied FET-type biosensors to detect antibody by aptamer, and glucose and urea by enzyme. Recently, we have succeeded to fabricate a high-performance glucose sensor based on an enzyme-modified extended-gate FET. Figure 1 shows the glucose detection characteristic of the fabricated sensor. The sensor was able to detect reversibly and repeatedly the glucose concentration in phosphate buffered solution with a considerably low Michaelis constant of ~0.05 mg/mL for more than a month. These results indicate that the sensor enables to detect repeatedly such low glucose concentrations as those in urine, sweat and saliva. Due to the fast response time and a wide detection range of the glucose concentration as shown in Fig. 2, our sensors are promising for the application to next-generation health care chips.

Systems Control Laboratory
Prof. Hiroshi OKU

An experimental device for autonomous flight control of a small radio-controlled helicopter with six degrees of freedom. The position and attitude are measured using a motion capture system, and the control input signals calculated according to the control algorithm implemented in the PC are transmitted to the radio-controlled helicopter via the radio.
An experimental device for autonomous flight control of a small radio-controlled helicopter with six degrees of freedom. The position and attitude are measured using a motion capture system, and the control input signals calculated according to the control algorithm implemented in the PC are transmitted to the radio-controlled helicopter via the radio.

The modeling is the key technology for analysis, estimation, control and diagnosis of systems. Systems Control Laboratory works on developing methods and algorithms for modeling. Especially, system identification is the central keyword for our laboratory. System identification is methodology to model a system using data sampled from the system to be modeled. Our laboratory has developed a closed-loop state-space subspace identification method, and applied it to practical systems, e.g., feedback control of radio-controlled miniature helicopters, quadrotor drones, cart-inverted pendulum systems, and so on. As a spin-off of system identification, our laboratory has developed online fault detection algorithms for early warning systems.

Simulation Laboratory
Prof. Akio NISHIGUCHI

Examples of computer simulation results.
Examples of computer simulation results.

With the improvement of computer performance, computer simulations have been used in various fields. In this laboratory, we are developing computer simulation methods to reproduce or simulate various phenomena by numerical calculation. Computer simulations can reproduce or simulate any phenomenon that can be expressed by mathematical equations. Recently, we are studying especially the analysis of phenomena such as electromagnetic waves, normal fluids, electromagnetic fluids, plasmas, and astronomical phenomena.

Main Research Topics

  • Generation of spontaneous magnetic fields in high temperature and high density plasmas and their effects on plasma behavior
  • Research on non-local electron heat conduction in high temperature and high density plasmas
  • Visualization of three-dimensional computer simulation data
  • Research on numerical methods for fluid dynamics

Microcomputer Systems Laboratory
Prof. Tokuo YODO

Multicolor LED plant factory (example of hydroponic cultivation of potherb mustard)
Multicolor LED plant factory (example of hydroponic cultivation of potherb mustard)

Control of systems using microcomputers and their construction.
The first project is the application of microcomputer systems to plant factories. Although Japan's agriculture has world-class cultivation technology, its land area is small, and it is important to introduce electronic technology into the agricultural sector. The key to the survival of agriculture is the "plant factory," an electronic cultivation technology that enables unmanned mass production while maintaining the quality and safety of agricultural products. We are also applying unattended optimization using microcomputers to the cultivation of vegetables and grains, and developing high-intensity LED light sources with optimal light spectra.

Main Research Topics

  • Research and development of high-brightness LED light sources with optimal light spectrum for cultivation of vegetables and grains
  • Research on nitride material process technology for realization of blue optoelectronic integrated circuits using plasma
  • Technical study for unmanned practical use of a grain factory using a microcomputer
  • Research on Nitride/Oxide Ceramics/Semiconductor Integration Process for Realization of New Optical Functional Devices
  • Research on the effects of various wavelengths of high-brightness LED light on the growth process of various vegetables and grains

Communication Systems Laboratory
Associate Prof. Kazuo KUMAMOTO

Communication Systems Laboratory

Recently, wireless communication services have been widely developed and our lifestyle becomes very convenient. On the other hand, the systems are becoming more complex. As a result, wireless communication services are not always “kindness” for users, as the number of types of wireless services is increasing. Goals of our laboratory is to establish “user-oriented” wireless communication network which the communication network and terminals have intelligence and automatically construct a better communication environment for the user by reflecting the user's environment and intentions. In this laboratory, we are researching various theme in related fields to realize such a network.

Main Research Topics

  • Research on bi-directional highly precise positioning estimation system utilizing heterogeneous wireless
  • Research on WiFi security key generations using multipath transmission spectrum on RoF distribution antenna system
  • Research on atmospheric turbulence on free space optics using 2 micro-meter LD
  • Research on RoFSO-MIMO transmission
  • Development of smart disaster prevention system using painless-mesh network

Applied Materials Nanosystems Laboratory
Associate Prof. Nobuya HIROSHIBA

Applied Materials Nanosystems Laboratory

Our research aim is to construct nanosystems such as FET devices and biosensing systems by applied materials with the various functions and properties. We are investigating the materials properties that lead to innovative device functions. Especially, nanofabrication techniques and precise thin-film formation methods are our emphasis. We have developed unique technologies to fabricate organic semiconductor nanowires and molecular superlattice structures.

Main Research Topics

  • Investigation of the growth mechanism of organic semiconductor nanowires
  • Sensing device applications using oxide semiconductor thin films
  • Sensing device applications using graphene and atomically thin films
  • Analysis of polymer materials utilizing terahertz spectroscopy

Information Photonics Laboratory
Associate Prof. Ryohei YASUKUNI

Information Photonics Laboratory

We develop novel manipulation, measurement, and analysis methods based on various interactions between light and matter in nano to micrometer scale.

Main Research Topics

  • Fabrication of functional nanomaterials by laser ablation
  • Development of new methodologies to evaluate physical property in microdomain by combining laser and microscopy techniques

Electromagnetic Compatibility Laboratory
Assistant Prof. Masashi KAWAKAMI

EMI Diagram
EMI Diagram

With the development of technologies using electromagnetic waves (Wi-Fi, Bluetooth, wireless power transmission, etc.), electromagnetic interference (EMI) unintentionally generated from electronic devices can cause malfunctions in other electronic devices, and interference between electromagnetic waves can cause communication problems in wireless communications. In this laboratory, we are working on elucidating the mechanisms of these problems, developing countermeasure methods, designing RF circuits to make effective use of electromagnetic waves, and developing applied technologies using electromagnetic waves.

Main Research Topics

  • RF characteristics of communication wire harnesses
  • PI/SI/EMC co-design methods for electronic devices
  • Energy harvesting using radio waves