Tohoku University. Research Profiles

LANGUAGE

"D" Keywords - 74 Result(s)

D

 D

[Damage Concentration]

[Data Analytics]

Data Analytics for Creation of Social Values

Features

My research field is a data analytics for creation of social values by data science approaches. In modern society, we can observe various data sets about our daily life, business or community. I aim to create new services for it using such data set and methods of Bayesian modeling, data mining or machine learning.

Targeted Application(s)/Industry

Graduate School of Economics and Management
ISHIGAKI Tsukasa, Associate Professor Doctor of Philosophy

[Data Science]

Data Analytics for Creation of Social Values

Features

My research field is a data analytics for creation of social values by data science approaches. In modern society, we can observe various data sets about our daily life, business or community. I aim to create new services for it using such data set and methods of Bayesian modeling, data mining or machine learning.

Targeted Application(s)/Industry

Graduate School of Economics and Management
ISHIGAKI Tsukasa, Associate Professor Doctor of Philosophy

[Deep depth]

Development of the method of Baby Borehole Hydraulic Fracturing, BABHY

Features

For the effective measurement of the reopening pressure in hydraulic fracturing, it is necessary to use the testing equipment with sufficiently small compliance. This limitation makes it difficult to apply the hydraulic fracturing for the measurement of the maximum stress, because the compliance of conventional equipments is generally so large. Taking account of this situation, we proposed a new concept which allows us to do the in-situ tests of hydraulic fracturing for stress measurement at so deep depths as more than 1 km. We call the concept the Baby Borehole Hydrofracturing, BABHY for short. In order to put the new concept into practice, we developed the BABHY sonde and finally we succeeded to carry out hydraulic fracturing test by using the tools in a vertical borehole of 811 m depth. We hope to conduct collaborative research with a willing company for a practical application of this technology in industry.

Large-Scale Environmental Fluid Dynamics Laboratory, Complex Flow Division, Institute of Fluid Science
ITO Takatoshi, Professor Doctor of Engineering

[Defect]

Analysis and Function Elucidation of Fine Clusters and Defects in Materials Invisible by Electron Microscopy

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Features

It is well known that nano-scale impurity/solute clusters, defects, defect clusters and their complexes affect the mechanical and electrical properties in materials. However, it is very difficult to observe these objects even by state-of-the-art electron microscopes. We overcome the difficulty by employing noble two techniques: laser three-dimensional atom probe (3D-AP) technique and positron annihilation spectroscopy (PAS). Laser 3D-AP can map out each atom in various materials (metals, semiconductors, insulators) in three-dimensional real space with nearly atomic scale resolution. PAS can detect vacancy-type defects and defect-impurity complexes very sensitively.

Targeted Application(s)/Industry

By combining these methods, we are going to reveal the functions of the fine impurity clusters and defects to the materials: developments of new nano-structured materials, the mechanism of degradation of aged structural materials, the fall in the yield of semiconductor device production, and developments of quantum devices etc.

Institute for Materials Research
NAGAI Yasuyoshi, Professor PhD

[Degradation]

Innovative Preparing and Thick Coating Technique without Heat Affected Zone and Phase Transformation

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Features

The cold spray (CS) technique is known as a new technique not only for coating but also for thick depositions. It has many advantages, i.e. dense coating, high deposition rate, low oxidation, and no phase transformation. We have been carrying out establishment of innovative preparing and coating techniques using the CS, and maintenance of reliability and safety of the cold sprayed repairing parts and coatings. Moreover, in order to evaluate the compatibility between a substrate material and particles based on an adhesion mechanism and scientific basis, various adhesion conditions are examined a micro / nano-structure observation and a molecular simulation.

Targeted Application(s)/Industry

Our targets were mainly hot section parts of thermal power plants and reactor piping and tubes etc. Recently, it is possible to make a ceramic coating. Therefore, we accelerate the evolution of the other fields including the creation of the functionality materials in near future.

Fracture and Reliability Research Institute, Graduate School of Engineering
OGAWA Kazuhiro, Professor Doctor of Engineering

[Delay Tolerant Network]

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

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Features

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.

Targeted Application(s)/Industry

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.

Graduate School of Information Sciences
KATO Nei, Professor Doctor of Engineering

[DEM]

Powder Processing Contributing to the Global Environmental Protection

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Features

Material properties and characteristics of the product as a raw material powder are dependent on the particle packing structure as well as the chemical composition. Sophisticated control of the powder processing such as mixing and grinding is strongly required. In our laboratory, we are creating the simulation method as a tool for controlling the powder processing and optimizing the powder process for achieving a resource-saving and energy-saving by the computer simulation.

Targeted Application(s)/Industry

We are conducting research on analysis/optimization of powder processing such as grinding, mixing, and packing by using simulation, metal recycle from urban mine through active utilization of mechanochemical effect, and generation of energy from biomass.

Institute of Multidisciplinary Research for Advanced Materials
KANO Junya, Professor Doctor of Engineering

[Dementia]

Brain Development and Aging Using Large Brain MRI Database

Features

We have revealed relationships among brain structure, brain function, lifestyle, genetic factor, and cognitive function using brain magnetic resonance imaging (MRI) database. The goal of our project is to prevent several diseases and disorders such as dementia by performing personalized medicine using the large brain MRI database.

Targeted Application(s)/Industry

Our research is related with several industrial fields such as food, sleep, and other lifestyle industries. In addition, our research is also related with medical field such as preventing medicine and brain check-up.

Institute of Development, Aging and Cancer
TAKI Yasuyuki, Professor Ph.D.

Brain Science-Based Preventive Care and Rehabilitation for Dementia in Communities

Features

1. To produce the brain science-based evidence for dementia prevention using neuropsychological tests and neuroimaging methods (amyloid PET etc.)
2. To establish the evidence-based integrated community care system including early detection, preventive care, and rehabilitation for dementia.
3. To apply for early screening of the " weakness due to disaster" by considering the measure for dementia is similar to that for the weakness.

Targeted Application(s)/Industry

An industry-academic cooperation is expected with insurance companies, industries for producing screening device, program for preventive care and rehabilitation.

Division of Geriatric Behavioral Neurology, Cyclotron and Radioisotope Center
MEGURO Ken-ichi, Professor MD, PhD

[Dental caries]

Oral Biofilm Functional Analysis: from “What Are They?" to “What Are They Doing?"

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Features

A large number of microorganisms inhabit the oral cavity, such as the teeth, gingiva and tongue, in the form of oral biofilm. The oral cavity forms an ecosystem where the host (humans) and parasites (microorganisms) coexist. Disruption of the balance of this oral ecosystem leads to dental caries, periodontal diseases and oral malodor, and even deterioration of dental materials.

Using leading-edge techniques of anaerobic experimental systems including original and unique devices, as well as the notion of "omics" such as metagenomics and metabolomics, we conduct research on oral biofilm functions. Knowledge of oral biofilms, from "what are they?" to "what are they doing?", enables us to address their control, that is, prevention of and therapy for oral biofilm-associated diseases.

Targeted Application(s)/Industry

Risk assessment of oral biofilm-associated diseases, such as dental caries, periodontal disease, oral malodor and aspiration pneumonia
Effects of medicine and food ingredients on oral biofilm function
Evaluation of biofilm-mediated material deterioration

Division of Oral Ecology and Biochemistry, Graduate School of Dentistry
TAKAHASHI Nobuhiro, Professor DDS, PhD

[Dental occlusion]

High-Precision Capturing of 3-D Dental-Arch Shapes and Their Occlusal Relation and its Potential Implementation into CAD/CAM Dentistry

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Features

In spite of the long history of digital dentistry, the accuracy of the prosthetics fabricated with CAD/CAM systems is far from satisfactory. Jaw opening during taking impression elicits deformation of the mandible and the lower dental arch, and consequently causes the inaccuracy of occlusal relationship of the upper and lower dental arches on the CAD data. The method presented here utilizes the check-bite record at the maximum intercuspation to correct the relative positions among the teeth in the dental arches as well as between the arches. After this correction, the accuracy of the CAD data is satisfactory enough for the fabrication of the dental prosthetics which need no adjustment during their setting.

Targeted Application(s)/Industry

This method uses the newly-developed check-bite recording technique together with the conventional precious impression or optical impression techniques. It can easily be applied to the commercial CAD/CAM systems in the market. We hope to collaborate to the manufacturers of dental CAD/CAM systems to increase the accuracy of the systems.

Graduate School of Dentistry
HATTORI Yoshinori, Professor DDS, PhD

 d

[damage-free nanofabrication]

Development of Innovative Green Nanodevices Using Damage-Free Processes

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Features

We developed an entirely new concept of "bio-template ultimate process technology" and realized fabrication of uniform, size-controllable, defect-free, high-density and regularly-distributed quantum dot array on surface of arbitrary material. The quantum dot array can be applied to high efficiency and inexpensive quantum dot solar cells, high luminescence quantum dot lasers, high-speed graphene / germanium transistors, and so on, i.e., energy-generating, energy-storing, and low-energy-consumption devices.

Targeted Application(s)/Industry

We can accept collaborative researches on nanodevices such as quantum dot solar cells or lasers, low-energy-consumption devices such as graphene transistor and germanium transistor, and fundamental technologies such as plasma/beam processes, thin film deposition, doping, and surface treatment.

Green Nanotechnology Laboratory, Innovative Energy Research Center, Institute of Fluid Science
SAMUKAWA Seiji, Professor Doctor of Engineering

[database]

Brain Development and Aging Using Large Brain MRI Database

Features

We have revealed relationships among brain structure, brain function, lifestyle, genetic factor, and cognitive function using brain magnetic resonance imaging (MRI) database. The goal of our project is to prevent several diseases and disorders such as dementia by performing personalized medicine using the large brain MRI database.

Targeted Application(s)/Industry

Our research is related with several industrial fields such as food, sleep, and other lifestyle industries. In addition, our research is also related with medical field such as preventing medicine and brain check-up.

Institute of Development, Aging and Cancer
TAKI Yasuyuki, Professor Ph.D.

[databases]

Advanced Software Development Environment Based on a New Functional Language SML#

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Features

We have been developing a new functional programming language, SML#. This language combines the benefits of higher-order and typed programming language ML with the practically important features including: flexible treatment of record structures through record polymorphism, seamless interoperability with C language, and seamless integration of SQL, a standard database query language. These features make SML# a viable alternative to existing programming languages in developing large and complex software systems. In particular, its seamless integration of SQL would enhance the productivity and reliability in developing recently emerging cloud computing software, for which database access and high-level programming are essential.

Targeted Application(s)/Industry

We hope to conduct collaborative research with a willing company on developing advanced and reliable software development environment based on SML# and the underlying language technologies.

Research Institute of Electrical Communication
Atsushi Ohori, Professor PhD

[dealloying]

Development of Open Nanoporous Base and Half Metals, Metalloids and their Alloys

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Features

Nanoporous metals have drawn considerable attention due to their highly functional properties. They are generally produced by selective dissolution of elements from a multicomponent alloy (known as the dealloying method). As this method is based on differences in the electrode potential of each element present in the alloy, and this potential is high for noble metals, porous structure can be obtained only for noble metals. Recently we have found a new, simple and easy dealloying method without using aqueous solution, which enable us to develop an open nanoporous non-oxidized metallic material even with base metals (such as Ti, Ni, Cr, Fe, Mo, etc), metalloids and their alloys.

Targeted Application(s)/Industry

This technique is very powerful for developing new functional electrodes, catalysts, filters as well for removing toxic metallic element from the surface of biomaterials containing the toxic element.

Institute for Materials Research
KATO Hidemi, Professor PhD (Engineering)

[deep learning]

Natural Language Processing for Semantic Analysis of Big Data

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Features

This lab conducts fundamental research for deep natural language processing (NLP) and NLP-oriented information organization such as classification, extraction, and summarization of language information. Our activities also cover a broad range of applied research including NLP-based information and knowledge mining, information credibility analysis, and resilient ICT through the maximal use of Big Data.

Targeted Application(s)/Industry

(i) Analysis of market trend or research trend through intelligent text mining, (ii) Discovery of potential needs and risks from opinions in social media, (iii) Management of knowledge in a company by analyzing internal documents, etc.

Graduate School of Information Sciences
INUI Kentaro, Professor Doctor of Engineering

[delayed fracture]

Hydrogen embrittlement of high strength steels

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Features

We are studying hydrogen embrittlement property of high strength steels from the aspects of both the effect of hydrogen on mechanical properties of high strength steels and hydrogen uptake behavior in corrosive environments. The topics of our study includes clarification of mechanism of hydrogen embrittlement of various steels, investigation of hydrogen entry caused by corrosion using electrochemical techniques, hydrogen visualization, proposing evaluation methods for hydrogen embrittlement property and so forth.

Targeted Application(s)/Industry

Collaborative research in the field of hydrogen embrittlement, for example, hydrogen embrittlement properties of high strength steels and the effects of metallographic structure and hydrogen traps, proposal of evaluation methods for hydrogen embrittlement property for some specific steel and for parts with specific shape, development of novel hydrogen visualization techniques.

Institute for Materials Research
AKIYAMA Eiji, Professor Doctor of Science

[demand analysis]

[dental magnetic attachment]

Development of the Nickel-Free Dental Magnetic Attachment Using the Magnetic Shielding Material which Lost its Magnetism by Nitrogen-Solid Solution

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Features

In the dental magnetic attachments which retain dentures, superstructures of dental implants, and so on, the non-magnetic stainless steel containing nickel is used in order to reinforce their retentive force by a magnetic circuit. The surface layer of magnetic stainless steel which loses its magnetism by nitrogen-solid solution obtained from heating in nitrogen gas at high temperature, enable to form a magnetic circuit, which does not contain nickel at all, and to reduce its components and manufacturing processes. The method using the nitrogen-solid solution in this study is warrantable to manufacture the nickel-free dental magnetic attachment with high safety.

Targeted Application(s)/Industry

The nickel-free magnetic attachment realizes a retainer with higher safety, and can expect the application to medical and dental care for clinical uses, such as not only a denture but a dental implant, an epithese, and so on with easy desorption.

Division of Dental Biomaterials, Graduate School of Dentistry
TAKADA Yukyo, Associate Professor Doctor of Engineering