Research Profiles

JP

"M" Keywords - 130 Result(s)

M
View Details

 M

[M2M]

Message Transmission without Cellular Coverage, “Relay-by-Smartphone"

 
NEXT
PREV
特徴・独自性
  • Our technology provides the necessary method for sending messages even when the physical infrastructure is not available. The technology utilizes common smartphone WiFi functionality to send message in a multi-hop fashion. Thus it is possible to send message to people further away. Our technology has been designed to be based on Delay-Tolerant Networks (DTN), but the technical key idea is the combination of DTN and Mobile Adhoc Network (MANET), which can improve the message delivery in an area with high population density or where mobility are fixed such as evacuation center.
実用化イメージ

This technology can be used to distribute information during emergency situation such as after disaster. In addition, it is possible to provide additional services such as advertisement within shopping areas, distribution of coupons, exchange of information within small group during public events or uses as transceiver during group hiking. There is also possibility of using this technology to provide communications service in developing nations.

Researchers

Graduate School of Information Sciences

Nei Kato

[Machine Learning]

Developing plastic waste sorter using Terahertz waves and social implementation of sustainable recycling technology

 
 
 
NEXT
PREV
概要

This research utilizes the characteristics of terahertz waves, used in next-generation communications and autonomous driving, to identify the materials of plastic waste. It improves existing recycling technologies and can be applied to evaluate the quality of recycled plastics, ensuring stable production of high-quality recycled plastics. It enables easy development of devices to solve various issues in containers and packaging and automobile recycling, contributing to the realization of decarbonization and a circular economy.

従来技術との比較

Conventional plastic waste identification and sorting technologies use specific gravity sorting or near-infrared devices. Particularly, near-infrared sorting technology has accumulated an enormous amount of data and serves as the primary sorting technology in plastic recycling plants. However, near-infrared devices struggle with identifying black plastics, additives, and degradation. This technology uses terahertz waves to measure and evaluate transmission and absorption characteristics, allowing for identification of black plastics, additives, and degradation.

特徴・独自性
  • In recent years, there has been increasing global attention on plastic waste issues, such as marine pollution from drifting garbage and microplastics, the overseas export of plastic waste resources, and the increase in disposable containers like plastic bags and straws, especially due to the impact of COVID-19. There is growing demand for advanced identification and recycling of plastic waste materials, especially in the context of achieving the Sustainable Development Goals (SDGs) and realizing a circular economy.
  • The research group from Tohoku University, Shibaura Institute of Technology, and Shizuoka University has conducted research on the commercialization of advanced sorting devices for plastic packaging waste. We have successfully identified mixed plastics containing black plastics, additives, and flame retardants, which were difficult to identify with existing devices, by utilizing the characteristics of terahertz waves. We have also confirmed the ability of terahertz waves in assessing degradation caused by UV or long-term use. Furthermore, the method has been shown to be effective for distinguishing bioplastics, which is expected to see increasing demand in the future, in addition to plastic waste from container packaging, automobiles, and home appliances.
  • These identification technologies can be applied to properly sort plastic waste generated by the “The Plastic Resource Circulation Act,” enacted in 2022, contributing greatly to securing high-quality recycled resources through plastic waste resource recycling.
  • Our research group conducts interdisciplinary research with experts in various fields: social engineering, resource circulation (Professor Jeongsoo YU), optical engineering (Professor Tadao TANABE of Shibaura Institute of Technology and Professor Tetsuo SASAKI of Shizuoka University), information science and big data analysis (Associate Professor Kazuaki OKUBO), data collection and analysis, international cooperation (Specially Appointed Lecturer Gaku MANAGO), social experiments, and behavioral economics (Assistant Professor Xiaoyue LIU). We address the needs from social, economic, and environmental issues both domestically and internationally, working from diverse perspectives to solve challenges and contribute to the creation of a sustainable society. Collaboration and networking with private companies, government agencies, research institutions, and civic organizations are also expected.
実用化イメージ

This technology can be applied to the development of plastic waste identification and sorting devices from processes such as containers and packaging recycling, automobile recycling, and home appliance recycling, as well as the production and quality evaluation of recycled plastics.

Researchers

Graduate School of International Cultural Studies

Jeongsoo Yu

Optimizing everything / Optimal Society

 
 
 
NEXT
PREV
特徴・独自性
  • Aiming at developing practical quantum optimization technology known as quantum annealing, we are working on exploring basic technologies that can overcome the limitations and applications in collaboration with multiple companies. The advantage of the method is that it can be used simply by formulating a cost function that draws the goal to be optimized once, but we are not limited to the original method. We extend it by considering a much easier problem, sequential optimization by learning, black box optimization, etc.. In particular, it is being applied to automated driving, logistics in factories, and evacuation guidance during disasters.
実用化イメージ

Applications to route search problems such as automatic driving of various vehicles, evacuation route guidance at the time of disaster, process scheduling and a large number of combination problems. We can provide a solution to combinatorial optimization in each industry. (Transportation / distribution, manufacturing, materials, drug discovery, etc.)

Researchers

Graduate School of Information Sciences

Masayuki Ohzeki

newData science-based analysis for unsteady aerodynamic flows

 
 
 
NEXT
PREV
概要

Our group studies a range of unsteady flow phenomena leveraging data science, nonlinear machine learning, complex network theory, information theory, and computational fluid dynamics. Our ultimate goal is to build a data-oriented foundation for real-time analysis, modeling, and control of unsteady flows ubiquitously appearing in various situations around small air vehicles, airplanes, motor vehicles, and fluid-based industrial machines.

従来技術との比較

Equipped with nonlinear machine learning-based sparse sensor reconstruction and data compression supported through traditional numerical and experimental analysis, our approach enables high-resolution reconstruction, real-time prediction, and control of flow fields with limited availability of data.
These techniques are aimed at analyzing and controlling large-scale, complex nonlinear flow phenomena that have been challenging to tackle with conventional linear methods.

特徴・独自性
  • ・Real-time spatiotemporal flow field reconstruction from sparse sensors is enabled by turbulence super-resolution analysis with machine learning.
  • ・Understanding and modeling of unsteady fluid flows at low cost is made possible through low-dimensional manifold identification and compression.
  • ・Development of explainable machine-learning approaches for analyzing causal vortex interactions based on complex network theory and information theory.
  • ・Multi-modal data analysis through the fusion of numerical, experimental, and theoretical data.
実用化イメージ

Our group aims to develop technologies that accurately sense, predict, model, and control fluid flows —such as air and water— around objects including airplanes, automobiles, and wind turbines, even with sparse sensor information.

These technologies can contribute to society in various ways, including:
・Improving fuel efficiency and safety of aircraft
・Enhancing the aerodynamic performance of vehicles for energy savings
・Supporting disaster prevention through wind flow prediction during emergencies

We actively seek to co-create innovations through joint research with industrial companies interested in the following areas:

・Predicting and controlling fluid flows using AI and machine learning
・Understanding flow structures through information theory and network science
・Building highly accurate and reproducible models by integrating traditional fluid dynamics with modern data-driven methods

Equipped with physics-based nonlinear machine learning, we are working to develop groundbreaking fluid analysis technologies that benefit a wide range of industrial, environmental, and societal applications.

Researchers

Department of Aerospace Engineering, Graduate School of Engineering

Kai Fukami

newAnalyzing Social Phenomena and Human Behavior with Information Technology and Big Data.

概要

Computational social science seeks to understand social phenomena and human behavior using advanced computational methods, including machine learning, simulations, and digital experiments. The field covers a wide range of topics—from opinion formation on social media to spatial social segregation, where different social groups are geographically separated—and actively explores new possibilities offered by innovative generative AI technologies, such as large language models. In this term, it aims to contribute both to establishing a new research framework and to solving practical social issues.

従来技術との比較

A key advantage of computational social science methods lies in their ability to dynamically and accurately capture complex social phenomena and human behavior, overcoming limitations of traditional social sciences that primarily rely on small-scale surveys and static data.

First, by directly analyzing the vast amounts of behavioral data generated daily, it becomes possible to understand large-scale, high-granularity social processes that were previously difficult to grasp. Second, the use of computational methods allows for the discovery of complex patterns and the structure of new social phenomena that might be overlooked by human intuition or conventional theories alone. Third, by combining simulations and digital experiments, the field has moved beyond mere description and correlation analysis to verifying causal mechanisms and future scenarios.

In this way, computational social science complements traditional methodologies and possesses the advantage of developing social science into a discipline that contributes to solving social problems.

特徴・独自性
  • This field is positioned as a new research framework that integrates social science and information science. It establishes the subject and direction of analysis based on theoretical considerations from social science, then verifies and develops those theories through empirical analysis and simulations that utilize computational techniques and big data.
実用化イメージ

By leveraging information technology and big data to examine diverse social phenomena and human behavior, the field offers valuable knowledge and expertise for understanding current societal conditions and for designing and evaluating effective intervention strategies.

Researchers

Graduate School of Arts and Letters

Lyu Zeyu

[Macroclusters]

Development of Nano-Interface Chemistry for Materials Sciences Using Surface Forces Measurement

 
 
 
NEXT
PREV
特徴・独自性
  • Our research aims at developing methods, including instrumentation, for characterizing surface (or interface) at the nano-meter level. Most of our research subjects are related to the surface forces measurement, which can directly monitor the interaction between two surfaces. We study phenomena occurring at the solid-liquid interface such as adsorption and structuring of liquids. We have developed the resonance shear measurement which is a sensitive method for evaluating properties of confined liquid for nano-rheology and tribology. Twin-path surface forces apparatus we developed enabled us to study wide variety of samples such as metals, ceramics and plastics.
実用化イメージ

These methods are applicable for characterizing lubricants, nano-materials, paints, sealants, and cosmetics. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Researchers

New Industry Creation Hatchery Center

Kazue Kurihara

[magma]

Forecasting eruption transition through geologic and petrologic approaches

NEXT
PREV
特徴・独自性
  • 1) In addition to geophysical observations, recent advances in volcanic stratigraphy and petrology would make us possible to forecast the transition of volcanic eruptions. We have been developing near-real-time volcanology based on the erupted materials in an early eruption stage.
  • 2) Automation of textural analyses of erupted materials, Risk assessment of volcanic eruption based on eruption stratigraphy
実用化イメージ

Researchers

Graduate School of Science

Michihiko Nakamura

[Magnesium battery]

Advanced Nanotechnology for Critical metal free secondary battery

 
 
NEXT
PREV
特徴・独自性
  • Monoatomic layered materials of Graphene, Transition metal sulfide nanosheet, nanocrystalline active materials, nanoparticles and nanoporous materials are investigated for realizing high capacity, high power, high safety and low cost energy storage devices as a post- Lithium ion battery. Advanced chemistry of functional materials and device processes for All solid state battery, Magnesium battery, fuel cells, supercapacitor and wearable batteries are investigated.
実用化イメージ

Academia – Industry collaboration with manufacturing companies of functional materials, batteries, and also smart grid, renewable energy, electrical power companies are encouraged for developments of advanced energy materials and post-Lithium ion battery.

Researchers

Institute of Multidisciplinary Research for Advanced Materials

Itaru Homma

[magnetic actuator]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[magnetic anisotropy]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[Magnetic film]

Polymer-nanoparticle hybrid materials

 
 
NEXT
PREV
特徴・独自性
  • Hybrid materials that show multi-functions of polymer and nanoparticles are expected to be used in future industries, and thus many research and development have been actively conducted. However, since the affinity of polymer and inorganic nanoparticles is very low, in most of the cases, properties of different materials are incompatible in the hybrid materials. To create the hybrid materials with incompatible multi-functions has been considered a difficult task.
  • However, by using supercritical fluid technology, we have succeeded in making hybrid materials with incompatible multi-functions.
実用化イメージ

Now, variety of hybrid materials are being developed, including
・Transparent, flexible, high reflective index, and high fabricability,
・Flexible, high heat conductivity, low electric resistivity, and high fabricability.

Researchers

Advanced Institute for Materials Research

Tadafumi Ajiri

[Magnetic Material]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[magnetic materials]

Spintronics Devices and Materials

 
 
 
NEXT
PREV
特徴・独自性
  • Spintronics is a technology utilizing electron spin which provided magnetic sensor, nonvolatile magnetic memory, and so on. Our studies are as below.
  • Noble & Rare-earth free magnetic films with large perpendicular magnetic anisotropy. We achieved to develop various Mn-bases alloy films exhibiting high perpendicular magnetic anisotropy (Fig.1 ).
  • THz range observation of magnetization motion. We achieved to detect a motion of magnetization using pulse laser in time domain (Fig. 2).
  • Novel organic spin devices. We achieved to fabricate hybrid junction consisting of an organic layer sandwiched by two inorganic magnetic layers and to observe magnetoresistance effect.
  • Tunnel Magnetoresistive devices: We are developing TMR devices with Mn-Ga alloys films (Fig.3 ).
実用化イメージ

Magnetic memory and storage. Microwave and Terahertz wave. Magnetic sensors.
We hope to conduct collaborative research with a willing company for a practical application of these devices and materials in industry.

Researchers

Advanced Institute for Materials Research

Shigemi Mizukami

[magnetic sensor]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[magnetic thin film]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[magnetism]

Neutron scattering study on macroscopic quantum phenomena

 
 
NEXT
PREV
特徴・独自性
  • In contrast to other scattering techniques, such as x-ray and electron diffractions, neutron scattering has the following advantages: 1) light atoms, such as H and Li, can be detected; 2) electron spins can be detected; 3) low energy excitations can be investigated. Using the neutron scattering technique, we search for macroscopic quantum phenomena in many-body electron systems, such as macroscopic singlet ground states in the quantum frustrated magnets and spin-fluctuation-mediated unconventional superconductors.
実用化イメージ

As noted above, neutron scattering can be used for investigating magnetic structure, spin dynamics, light atom positions in crystalline materials and their dynamics. Hence, this technique is very useful when those pieces of information are to be known.

Researchers

Institute of Multidisciplinary Research for Advanced Materials

Taku J Sato

[magneto elastic materia]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

[magneto-optical effect]

Spintronics Devices and Materials

 
 
 
NEXT
PREV
特徴・独自性
  • Spintronics is a technology utilizing electron spin which provided magnetic sensor, nonvolatile magnetic memory, and so on. Our studies are as below.
  • Noble & Rare-earth free magnetic films with large perpendicular magnetic anisotropy. We achieved to develop various Mn-bases alloy films exhibiting high perpendicular magnetic anisotropy (Fig.1 ).
  • THz range observation of magnetization motion. We achieved to detect a motion of magnetization using pulse laser in time domain (Fig. 2).
  • Novel organic spin devices. We achieved to fabricate hybrid junction consisting of an organic layer sandwiched by two inorganic magnetic layers and to observe magnetoresistance effect.
  • Tunnel Magnetoresistive devices: We are developing TMR devices with Mn-Ga alloys films (Fig.3 ).
実用化イメージ

Magnetic memory and storage. Microwave and Terahertz wave. Magnetic sensors.
We hope to conduct collaborative research with a willing company for a practical application of these devices and materials in industry.

Researchers

Advanced Institute for Materials Research

Shigemi Mizukami

[magnetoresistive devices]

Spintronics Devices and Materials

 
 
 
NEXT
PREV
特徴・独自性
  • Spintronics is a technology utilizing electron spin which provided magnetic sensor, nonvolatile magnetic memory, and so on. Our studies are as below.
  • Noble & Rare-earth free magnetic films with large perpendicular magnetic anisotropy. We achieved to develop various Mn-bases alloy films exhibiting high perpendicular magnetic anisotropy (Fig.1 ).
  • THz range observation of magnetization motion. We achieved to detect a motion of magnetization using pulse laser in time domain (Fig. 2).
  • Novel organic spin devices. We achieved to fabricate hybrid junction consisting of an organic layer sandwiched by two inorganic magnetic layers and to observe magnetoresistance effect.
  • Tunnel Magnetoresistive devices: We are developing TMR devices with Mn-Ga alloys films (Fig.3 ).
実用化イメージ

Magnetic memory and storage. Microwave and Terahertz wave. Magnetic sensors.
We hope to conduct collaborative research with a willing company for a practical application of these devices and materials in industry.

Researchers

Advanced Institute for Materials Research

Shigemi Mizukami

[magnetostriction]

Magnetic Applications and Magnetic Materials

 
 
NEXT
PREV
特徴・独自性
  • The aim of our research are to obtain the high accuracy sensor system for the signals from the human body or electric devices and to obtain the system for approaching action to the human body by using the nano-scale controlled magnetic materials and by the development of the devices under the functions of the magnetics.
  • We studied the mechanism of obtaining the magnetic anisotropy of the magnetic thin films for the sensitive magnetic sensors. We obtained a non-metal probe for high frequency magnetic field, and confirmed the probe can measure the high frequency magnetic field with its phase information. In addition, 3D position detecting system using magnetic markers was studied to improve its position accuracy. The study about the magnetic actuator driven by the external magnetic field was carried out for biomimetic robots using the rotational magnetic field, and small wireless pumps were obtained and clarified for their application for an artificial heart-support pump.
実用化イメージ

<Medical Applications>
Motion system for capsule endoscope, Support system for endoscopic surgery, Position detecting system (motion capture), Wireless pump for artificial heart
<Sensors>
Magnetic field sensors, Strain sensors, Wireless sensors
<Materials>
Electrical steels of ultra low loss, Electrochemicaly produced materials (structure controlled in nano-scale)

Researchers

Research Institute of Electrical Communication

Kazushi Ishiyama

Research Profiles

Fields

ENGLISH
Close