Research on Multimedia system
(1) develop a 3D map presentation system while linking to the database system, and develop applications based on the system
(2) develop a teaching material presentation technology using database ECA rule mechanism

Research on IoT related technologies
(1) devise a location estimation method using radio strength of Bluetooth and evaluate the effectiveness by prototype system
(2) devise a recognition method of human movement status by acceleration sensor data

[Supercomputer × Bigdata × AI] With the experience accumulated through the operation and use of large-scale computer systems, we are conducting research aimed at designing intelligent computational algorithms for bigdata analytics, and creating practical and social solutions from the user’s perspective. Examples of bigdata processing using supercomputer include (i) detection, diagnosis, and prediction of lesions in clinical dentistry, (ii) identification and tracking of individuals in ecological research, and (iii) design of adaptive job scheduling algorithms to reduce waiting time and operational costs. We are developing a wide variety of applications using artificial intelligence, machine learning, evolutionary computation, and combinatorial optimization techniques.

On the basis of the formal language theory, algorithms to solve the language phenomenon have been developed. As applications, my study is developing reputation analysis of the questionnaire, analysis of the words of difficulty degree of difference between the multilingual, and a regional information analysis utilizing short comments (Twitter).

More than ten thousands people died caused fatal accidents in houses every year in Japan. Among them a number of the aged people died in falling down to flat floor even though without any steps. Floor slipperiness is usually represented as static friction coefficient at the slips in toe-off during last half of gait cycle. However, it is said that slips are also occurred at heel down to floor during first half of gait cycle. In order to evaluate floor slipperiness at heel down, it is necessary to measure the dynamic friction coefficient between footwear and floor under incremental vertical load during the heel down.
The wear of UHMWPE(ultrahigh molecular weight polyethylene) used in artificial joint is investigated more than 5 million cycles using joint simulator. The simulator is reproduced vertical load, flexion/extension, abduction/adduction and internal/external rotaion during gate cycle.

Computer games have grown along with technology, incorporating various cutting-edge technologies. Among them, our research focuses on real-time rendering technology that supports interactivity and immersion, and networks that support connections with others. Through research on the mechanisms of getting hooked on games and social media, I would like to work on social contribution through games (education, community revitalization, aesthetics, public relations, etc.) and the role that games play in society.

We are interested in the effects of the artificial environment of imaging systems on humans. We have studied both pros and cons effects. Examples of the good effects are viewers’ sense of power, immersion, and presence, in which the viewers feel as if they are in the space projected by the imaging system. The problem of quantifying these senses is that it is not possible to measure them with a measuring instrument. These characteristics related to human senses and sensitivity can quantified through subjective evaluations and questionnaires. At the same time, biometric measurements are performed to search for measurement items that may serve as biological indices. We are investigating the relationship between subjective evaluations and biological indices.
Conversely, undesirable effects are that a person watching 3D images or a shaky image may experience eye fatigue or a motion sickness. To clarify what can be done to minimize these undesirable effects, we are studying the relationship between the undesirable effects and presented images by subjective evaluations and biometric measurements. In this process, we measure eye movements, autonomic nervous system, and brain activity to quantify the degree of the undesirable effects. Based on these results, we have proposed measures to prevent and mitigate undesirable biological effects.

There are many application fields for the development of rational methods for inferring desired information from observed data. One of the techniques is the alternating least squares method for decomposing a matrix. This method is used in a wide range of fields from analysis of psychological data to image processing. However, the theoretical background of this approach does not seem to be fully clarified. I am conducting research with various interests, centering on research to clarify the theoretical background of the alternating least squares method.

Even if you think you understand it, if you look at it from a different perspective, you may find some unclear points.
We are researching the construction of an easy-to-understand learning system that makes difficult-to-understand teaching materials easier to handle, encourages confirmation from multiple perspectives, and is easy to understand.
Based on conventional CAI and e-learning methods, we aim to build and release learning support systems such as algorithms and programming.
We are also researching a system that presents answers to simple puzzles in order to cultivate logical thinking.

１. It is important to develop the orthosis which improves the Quality of Life (QOL) and maintains health conditions. We focus on an electric wheelchair which is a welfare apparatus for mobility support of a physically handicapped person. Therefore, the estimated method can be obtained unknown parameters of the driving environment.

２. It is important to develop the orthosis which improves the Quality of Life and maintains health conditions. As one of treatment methods done to lumbago, the waist fixation method is performed. A waist active orthosis implement with pneumatic flexible actuators developed.

３. We develop 3D quasi-passive walker with flat feet.
And an antagonistic pneumatic system is used as joint actuators. 3D quasi-passive walking in the level ground can realize by the simple swinging input of the frontal direction.

By taking advantage of pneumatic actuators that have features of higher force / mass ratio, lightweight and flexibility based on compressibility, we have developed low-cost wearable actuators and low-cost home-based rehabilitation devices that can be disposable after using it. Specifically, we developed a flexible pneumatic cylinder that can be used even if the cylinder bends. A spherical actuator that consists of two flexible pneumatic cylinders have been also developed as an application for portable rehabilitation device. We have also developed a low-cost wearable servo valve using buckled tubes, an artificial muscle with built-in displacement sensor and a pipe inspection robot using extension type flexible pneumatic actuators. In addition, aiming at globalization for students, all graduate students in our laboratory have presentation in international conferences.

I have been engaged in research aimed at enhancing the functionality of computer networks. My specific research areas are as follows:
Highly Distributed Cloud Environments: In the context of edge computing, I am studying server placement strategies that can reduce response latency while ensuring the delivery of accurate and context-aware responses.
High-Speed Internet Technologies: I am working on methods to mitigate throughput collapse (called TCP Incast) within Data Center Networks (DCN) that employ TCP (Transmission Control Protocol) as their transport protocol.
Fault-Tolerant Internet Technologies:
I am researching techniques to ensure communication continuity by enabling rapid rerouting to bypass network failures as soon as they occur.

(Numerical analysis)In scientific computing most computational time is spent in solving systems of linear equations. It is necessary to study an algorithm for solving the large linear system fast and stably. We have proposed several new iterative algorithms and preconditioning techniques.

Vertical axis is the number of iterations, horizontal axis is the index of residual vector, and we display the magnitude of the residual vector in the color. When this becomes black beyond the red, the error becomes large and when this becomes white beyond the yellow, the error becomes small.
(ICT)Distance learning is a way of learning remotely without being in regular face-to-face contact with a teacher in the classroom. We study the support system for the programming lecture in distance learning.

Researchs are being conducted on care and welfare robot systems using soft pneumatic actuators and embedded controllers that can be used in ordinary homes. One of my research is the upper body support device for caregivers inclouding the part of arm will improve human affinity and do not interfere with caregiving movements. Because of an inexpensive, lightweight, and waterproof embedded controller, the support device can be used in small and humid spaces. The other one of my research is about the the walking training device for visually impaired children that is to reduce the burden on walking trainers, who are facing a shortage of manpower, and to reduce the physical and mental burden on the guardians. In addition, in my lab, we also develop the mattress that uses a flat soft actuator to change the position of contact between the body and the actuator by varying the applied pressure over time. Because when caring for the elderly and severely disabled, changing positions to prevent bedsores for bedridden patients which increases the caregiver’s restraining time and increases the mental burden.

The theme of our laboratory is to measure biological information obtained from humans and animals. Measured biological information is used in the development of various sensors, equipment, and software.

Statistics with Computer, R, Python, etc.

According to the increasing popularity of mobile devices such as tablet computer and smartphones, numerous contents like photo and text have been uploaded to SNS such as Twitter and Flickr.Those contents imply the information on user interests and behavior.My laboratory studies extracting and visualizing such information from SNS.

We am interested in topology of plane curves. It is related with its singularities and loction of singular points. We use several topological invariants to compare given plane curves. There are impotant class of plane curves which is called torus curves. They play important role to study topologies. We use this class for several interesting curves.

We are interested in singularities of smooth maps form R^2n to R^2. In particular, it is important to study existence of real Milnor fibrations. There were breakthrough studying it using mixed functions which were introduced by Ruas, Seade, Verjovsky and Oka.
After these work, many examples of pairs which give real Milnor fibrations have been investigated.

I study the tilting mutation, that is, an operation to get a new tilting module from given one. By using the tilting mutation, we can get many tilting modules. In association with tilting mutation, we can define partially ordered sets which are called (support tau-)tilting posets. My interest is in combinatorial properties of these posets.

Water hydraulic systems which use tap-water as working fluid are called aqua drive systems and they can realize novel green drive sources with 100% oil-free characteristics. In our laboratory, we study to realize a clean and safe system for rehabilitation, power assist, and life support. In addition, we have developed pure aqua drive systems, which can be driven without any power source, by controlling fluidic flow and have applied such systems to emergency drive sources and disaster prevention systems. We have also developed support systems to play musical instruments by only one hand.

It is widely believed that several physiological factors contribute to how humans perceive the position and shape of objects in three dimensions. 3D and aerial display technologies leverage these factors, enabling viewers to perceive images with a sense of real depth. We continue to explore ways to achieve more natural stereoscopic vision and to make objects appear as though they truly exist in empty space.
Please view the image on the right with your right eye and the image on the left with your left eye, aligning them so that the red objects overlap. You should then perceive a sense of depth, as if the red object is floating in midair with a glass plate beneath it. This effect is known as binocular disparity, one of the key physiological factors involved in depth perception.