A5051569420- Speech and Audio Processing
- Hand Gesture Recognition Systems
- Indoor and Outdoor Localization Technologies
- Soft Robotics and Applications
- Tactile and Sensory Interactions
- Silicon Carbide Semiconductor Technologies
- Structural Behavior of Reinforced Concrete
- Semiconductor materials and devices
- Ultrasound and Hyperthermia Applications
- Gaze Tracking and Assistive Technology
- Superconducting and THz Device Technology
- Silicon and Solar Cell Technologies
- Robot Manipulation and Learning
- Thin-Film Transistor Technologies
- Interactive and Immersive Displays
- Music and Audio Processing
- Structural Load-Bearing Analysis
- earthquake and tectonic studies
- Advanced Surface Polishing Techniques
- Video Surveillance and Tracking Methods
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Optical Wireless Communication Technologies
- Face and Expression Recognition
- Neural Networks and Applications
Future University Hakodate
2024-2025
Hokkaido University
1981-2024
Nitto (Japan)
2013-2023
National Institute of Information and Communications Technology
2023
Hokkaido University of Science
2022
ORCID
2022
Toyota Kosei Hospital
2021
Action in the Community Environment
2017
Ricoh (Japan)
1991-2017
Kobe University
2013-2017
In this study, we propose a new input method for mobile and wearable computing using facial expressions. Facial muscle movements induce physical deformation in the ear canal. Our system utilizes such characteristics estimates expressions canal transfer function (ECTF). Herein, user puts on earphones with an equipped microphone that can record internal sound of The transmits ultrasonic band-limited swept sine signals acquires ECTF by analyzing response. An important novelty feature our is it...
Large language models (LLMs) are increasingly utilized in domains such as finance, healthcare, and interpersonal relationships to provide advice tailored user traits contexts. However, this personalization often relies on sensitive data, raising critical privacy concerns necessitating data minimization. To address these challenges, we propose a framework that integrates zero-knowledge proof (ZKP) technology, specifically zkVM, with LLM-based chatbots. This integration enables...
Abstract Power devices are operated under harsh conditions, such as high currents and voltages, so degradation of these is an important issue. Our group previously found significant increases in reverse leakage current after applying continuous forward stress to GaN p–n junctions. In the present study, we identified type threading dislocations that provide pathways for this current. diodes were grown by metalorganic vapor phase epitaxy on freestanding GaN(0001) substrates with dislocation...
Threading dislocations (TD's) in a 4H-SiC MOSFET were characterized using transmission electron microscopy with special emphasis of their effects on leakage p–n junction. Two types TD's identified; threading near-screw dislocation (TnSD) , and mixed (TMD) the last which has been found for first time this study. The TnSD show only negligibly small leakage, while TMD shows large leakage. Origins difference degree have discussed.
In this study, we show a new gesture recognition method for clothing-based input methods using active and passive acoustic sensing. Our system consists of piezoelectric speaker microphone. The transmits ultrasonic swept sine signals, the microphone simultaneously records signals that propagate through garment rubbing sounds generated by gestures on garment. recognizes variety gestures, such as pinch, twist, touch, swipe, incorporating An important feature our is it does not require dedicated...
We present a material model to represent the viscoelastic and material, nonlinear properties of liver tissue for needle insertion simulation. Material were measured using rheometer modeled from data. The characteristics represented by differential equations, including fractional derivative term. Next, nonlinearity with respect was measured, stress-strain relationship cubic function modeled. simple equation only few parameters. evaluated variety each stiffness parameter measurements 50...
To assess when and how the microcatheter-facilitated reverse wire technique should be applied to cross guidewire into side branches in coronary bifurcations.Three interventional cardiologists with different levels of experience performed vitro bench testing using an originally developed bifurcation simulator which had six bifurcations. The angles were 90, 105, 120, 135, 150 165 degrees (°). Experiment 1 was conducted what is required. Antegrade advancement two guidewires: spring coil SION...
It is often difficult for orthopedic surgeons to avoid LCL injury during ACL reconstruction. In this paper, we developed a steerable drill reconstruction in the process of making bone tunnel. There are two special requirements mechanism. One having sufficient flexibility bend and while cutting bone. The other rigidity buckle at base when external force exerted on tip. These cannot be met simultaneously by using previous material with uniform stiffness throughout its length. We therefore...
We propose an activity and context recognition method where the user carries a neck-worn receiver comprising microphone, small speakers on his wrists that generate ultrasounds. The system recognizes gestures basis of volume received sound Doppler effect. former indicates distance between neck wrists, later speed motions. Thus, our approach substitutes wired or wireless communication typically required in body area motion sensing networks by Our also place is people who are near ID signals...
The reliability of gate oxides is a fundamental issue for realizing SiC MOSFETs. Many reports said that crystal defects shorten the lifetime oxide. And, epi defects, basal plane dislocations and threading screw (TSD) are considered killer defects. However, because high TSD density commercial wafers, exact relationship between other kinds with has not been revealed. On hand, RAF wafers we developed have low density, so it easy to evaluate lifetime. By using in this study, clarified oxide We...
In this paper, we describe a visible-light positioning system that uses the ambient-light sensor assembly in smartphone as receiver for illumination signals from LED-based room lighting. After correcting missing or inconsistently sampled data captured by receiver, can identify source LEDs contributing to received signal via Fourier analysis of its frequency distribution. Localization is then achieved trilateration distances various LEDs, which are calculated strength each LED. Experiments...
Motivated by the development of discriminative feature extraction (DFE), many researchers have come to realize importance designing a front-end unit with an appropriate link backend classification. This paper proposes advanced formalization DFE, which we call metric design (DMD), and elaborates on its exemplar implementation using simple, linear transformation matrix. The resulting DMD is shown close relationship various pattern recognizers, including artificial neural networks. utility...
First Name is required invalid characters Last Email Address Invalid
Before the eruption of Oshima Volcano on November 15, 1986, 5 proton magnetometers were operating volcano. One them, installed about 500m south from center central crater, recorded anomalous changes in total intensity preceding eruption. The variation began around 1981. decreased gradually at a rate -5.3nT/year (-0.44nT/month), amounting to 27nT decrease years. accelerated six months before was estimated be -2.2nT/month. At time eruption, very fast and significant observed. 4nT one minute....
In this paper, we propose a method for the 2D positioning of smartphone by receiving sinusoidally modulated light signals emitted ceiling-mounted LEDs. An ambient sensor (ALS) mounted on measures reflected illumination from floor. The advantage combination is that it consumes very little power, does not require implementation additional devices, and removes constraints placement LEDs caused field view. To best our knowledge, using ALS with floor has been proposed before. We conducted several...
We propose a novel biometric authentication method that leverages sound leakage signals from hearables are captured by an external microphone. A sweep signal is played hearables, and recorded using This represents the acoustic characteristics of ear canal, auricle, or hand. Then, our system analyzes echoes authenticates user. The proposed highly adaptable to because it widely available sensors, such as speakers microphones. In addition, has potential be used in combination with existing...
Needle insertion treatments require accurate placement of the needle tip into target cancer. However, it is difficult to insert cancer because displacement due organ deformation. Then, a path planning using numerical simulation analyze deformation important for insertion. The objective our work develop and validate viscoelastic nonlinear physical liver model. First, an overview given development Second, experimental method model explained. In-vitro experiments that made use pigpsilas were...
We have repeatedly measured the electrical resistivity of Oshima Volcano using bipole-bipole electrode arrangements across central cone, Mihara-yama. Apparent resistivities obtained by three different pairs electrodes varied according to vicissitudes volcanic activity. Changes associated with eruption on November 15, 1986, were particularly remarkable. The increase apparent nearest crater vent became noticeable about one and half years before eruption, day after breakout reached a value 17%...