A5087021066- Microwave Imaging and Scattering Analysis
- Geophysical Methods and Applications
- Advanced SAR Imaging Techniques
- Non-Invasive Vital Sign Monitoring
- Ultrasonics and Acoustic Wave Propagation
- Hemodynamic Monitoring and Therapy
- Ultrasound Imaging and Elastography
- Radar Systems and Signal Processing
- Indoor and Outdoor Localization Technologies
- Heart Rate Variability and Autonomic Control
- Optical Network Technologies
- ECG Monitoring and Analysis
- Knee injuries and reconstruction techniques
- Advanced Photonic Communication Systems
- Total Knee Arthroplasty Outcomes
- Ultra-Wideband Communications Technology
- Flow Measurement and Analysis
- Numerical methods in inverse problems
- Sparse and Compressive Sensing Techniques
- Advanced Optical Network Technologies
- Optical Imaging and Spectroscopy Techniques
- Cardiovascular Health and Disease Prevention
- Sports injuries and prevention
- Obstructive Sleep Apnea Research
- Photoacoustic and Ultrasonic Imaging
Chiba University
2021-2025
Kyoto University
2016-2025
Nippon Medical School Hospital
2025
Scripps Institution of Oceanography
2024
University of Tsukuba
2018-2024
Scripps (United States)
2024
Chiba University Hospital
2018-2024
Toho University
2024
The University of Tokyo
2001-2024
Toho University Medical Center Sakura Hospital
2024
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Ultrawide-band pulse radars have immeasurable potential for a high-range-resolution imaging in the near field and can be used noncontact measurement of industrial products with specular or precision surfaces, such as reflector antenna aircraft fuselage, identifying locating human body security systems. In our previous work, we developed stable high-speed 3-D algorithm, Envelope, which is based on...
We demonstrate dense SDM transmission of 20-WDM multi-carrier PDM-32QAM signals over a 40-km 12-core × 3-mode fiber with 247.9-b/s/Hz spectral efficiency. Parallel MIMO equalization enables 21-ns DMD compensation 61 TDE taps per subcarrier.
The objectives of this paper are to propose a method that can accurately estimate the human heart rate (HR) using an ultrawideband (UWB) radar system, and determine performance proposed through measurements. uses feature points signal HR efficiently accurately. Fourier- periodicity-based methods inappropriate for estimation instantaneous HRs in real time because heartbeat waveforms highly variable, even within beat-to-beat interval. We define six waveform features enable correlation...
A low distortion dc coupled CW radar system with high signal to noise ratio is capable of accurate representation respiration in human subjects. We propose test the hypothesis that a non-contact physiological monitoring which measures and characterizes subtle body kinematics, can be made resolve patterns accurately enough recognize an individual's identity. This paper investigates technique attain requisite by offset management. Detailed exploration unique features signals using noncontact...
In remote sensing, micro-Doppler signatures are widely used in moving target detection and automatic recognition. However, since Doppler easily affected by the direction of target, prior information aspect angle is essential for spectral analysis. Thus, a micro-Doppler-based classifier considered to be "angle-sensitive." this article, we propose an angle-insensitive omnidirectional classification problem using monostatic radar through proposed new convolutional neural network. We further...
A novel concept, called range‐Doppler surface (RDS), for human target analysis using ultra‐wideband radar is proposed. The construction of RDS involves (RD) imaging, adaptive threshold detection and isosurface extraction. Keystone‐transform‐based range migration compensation approach proposed to allow high‐quality RD imaging radar. Adaptive applied detect the extended in image, constructed by extracting an from a video sequence, which defined as sequence images. In comparison with...
This paper presents a compressive technique that simplifies the architecture of multiple-input multiple-output (MIMO) radar imaging systems. By means passive device connected to an MIMO array antennae, novel approach is introduced extract interaction between antennae from compressed signal measured two ports. relies on multiplexing principle exploits frequency diversity and it thus particularly suitable for ultrawideband theoretical underlying this technique, defining key parameters...
We propose a hand gesture recognition technique using convolutional neural network applied to radar echo in-phase/quadrature (I/Q) plot trajectories. The proposed is demonstrated accurately recognize six types of gestures for ten participants. system consists low-cost 2.4-GHz continuous-wave monostatic with single antenna. trajectories are converted low-resolution images and used the training evaluation technique. Results indicate that can average accuracy exceeding 90%.
In this paper, we propose a fast and accurate radar-imaging algorithm that combines Kirchhoff migration with Stolt's frequency-wavenumber (F-K) migration. F-K is known as fast-imaging method in the domain, while reported to be more accurate. However, requires reflection points located function of antenna position delay time. This prevents use Fourier transforms (FFTs) because must processed time can extremely consuming. The proposed overcomes hurdle by introducing texture angle inverse...
SUMMARY Ultra-wideband pulse radars are promising candidates for 3-dimensional environment measurements by autonomous robots. Estimating target shapes scanning with an omni-directional antenna is ill-posed inverse problem. Conventional algorithms such as the synthetic aperture method or parametric have a problem in terms of their calculation times. We clarified existence reversible transform between received data and systems. Calculation times remarkably reduced applying this because it...
Ultrawideband pulse radars have a great potential for high-range resolution in near field imaging and can be used noncontact measuring precision or specular products such as reflector antennas aircraft fuselages. We already proposed high-speed 3-D algorithm, SEABED, which is based on reversible transform, the boundary scattering between received signals target shape. However, estimated image with SEABED unstable random noise because it utilizes derivative of data. In this paper, we propose...
Target shape estimation with UWB pulse radars is a promising imaging technique for household robots. We have already proposed fast algorithm, SEABED, that based on reversible transform BST (Boundary Scattering Transform) between the received signals and target shape. However, image obtained by SEABED deteriorates in noisy environment because it utilizes derivative of data. In this paper, we propose robust method an envelope circles. clarify numerical simulation can realize level cannot be...
Ultrawideband (UWB) pulse radar with high range resolution is suitable for near-field sensing. Applications of UWB include human body identification in blurry vision security or rescue purposes and accurate spatial measurements industrial products such as a reflector antenna. The synthetic aperture still promising these applications because it creates an image even targets free space. However, complex-shaped multiple objects, this algorithm suffers from increased shadow region employs only...
We demonstrate an accurate remote measurement of heartbeats using ultra-wideband radar system. Although most conventional systems use either continuous waves or impulse-radio for vital monitoring, suffer from non-stationary clutters, while cannot detect heartbeats. Our system has a moderate fractional bandwidth intermediate these systems, resulting in both the suppression clutters and high sensitivity measuring heart rates even dynamic environment. A simultaneous signal participant employing...
Vital-sign estimation using ultra-wideband (UWB) radar is preferable because it contactless and less privacy-invasive. Recently, many approaches have been proposed for estimating heart rate from UWB data. However, their performance still not reliable enough practical applications. To improve the accuracy, this study employs convolutional neural networks to learn special patterns of heartbeats. In system, skin displacements target person are measured radar, signal converted a two-dimensional...
We developed a noncontact measurement system for monitoring the respiration of multiple people using millimeter-wave array radar. To separate radar echoes people, conventional techniques cluster in time, frequency, or spatial domain. Focusing on respiratory signals we propose method called respiratory-space clustering, which individual differences rate are effectively exploited to accurately resolve from human bodies. The proposed clustering can echoes, even when located close each other. In...
In recent years, gait-based person identification has gained significant interest for a variety of applications, including security systems and public forensics. Meanwhile, this task is faced with the challenge disguised gaits. When human subject changes what he or she wearing carrying, it becomes challenging to reliably identify subject's identity using gait data. paper, we propose an unsupervised domain adaptation (UDA) model, named <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This study proposes a method to determine the filter parameters required for topology method, which is radar-based noncontact measurement of heart inter-beat intervals. The effectiveness proposed evaluated by performing radar measurements involving both human participants and chimpanzee subjects. designed enable setting cutoff frequency eliminate respiratory components while maintaining higher harmonics heartbeat components. Measurements using millimeter-wave system reference contact -type...
Background: The factors contributing to osteoarthritis progression after anterior cruciate ligament (ACL) injury and reconstruction (ACLR) are not fully understood. Quantitative magnetic resonance imaging (MRI) offers a noninvasive way evaluate cartilage biochemical composition using T1ρ mapping, thereby detecting early degeneration. specific impact of preoperative quantitative MRI on long-term outcomes ACLR remains underreported. Purpose/Hypothesis: purpose this study was investigate the...
For high range resolution ultrasonographic vascular imaging, we apply frequency domain interferometry with the Capon method to a single frame of in-phase and quadrature (IQ) data acquired using commercial device 7.5 MHz linear array probe. In order tailor adaptive beam forming algorithm for ultrasonography employ four techniques: averaging, whitening, radio-frequency oversampling, moving average. The proposed had 0.05 mm in an ideal condition, experimentally detected boundary couple 0.17...
We propose a fast method of ultrawideband (UWB) radar imaging that can be applied to moving target, having in mind such application as concealed weapon detection. demonstrate the performance proposed using simulations and measurements with static targets. also compare computational complexity conventional clarify feasibility applying intended real-time systems.