2021年度より第6次科学技術・イノベーション基本計画がスタートしたが，その骨子には第5次基本計画で提唱された「サイバー空間とフィジカル空間を高度に融合させたシステムにより，経済発展と社会的課題の解決を両立する人間中心の社会」であるSociety 5.0の実現が主要な目標と

This paper describes the results measured with a radio evaluation system using under-sampling when the frequency difference between carrier and local signals changes continuously. In addition, we show the correction performance by estimating the frequency difference before and after correction. As a result, the phase fluctuation within the correction range could be corrected. Meanwhile, it was clarified that the element of the fluctuating frequency difference affects the signal evaluation and that there is a residual frequency difference after correction.

I have observed sea clutter containing an embedded target (ship) using an X-band radar with a frequency of 9.41GHz, a beamwidth of 1.0^°, a pulsewidth of 0.5µs, and a pulse-repetition frequency of 1,600Hz. To investigate the sea clutter amplitude statistics, I have used the Akaike Information Criterion (AIC). It has been found that the sea clutter amplitudes obey the Weibull distribution with the shape parameter of c=3.20 for entire data and the log-normal, Weibull, log-Weibull, and Nakagami-m distributions with the shape parameters of σ=0.508, c=3.60 to 5.42, c=8.72 to 12.07, and m=1.72 to 2.05, respectively, for data within the beam width of an antenna. The number of best fit of the log-normal, Weibull, log-Weibull, and Nakagami-m distributions to data is 1, 16, 2, and 2, respectively, from 21 small data. I have applied Weibull/CFAR (Constant False Alarm Rate) circuit configured by modifying Cell-Averaging (CA) LOG/CFAR circuit to the observed data. To generate random numbers in this CFAR circuit, I have introduced the Mersenne Twister method which is superior to the conventional multiplication congruence method. I have succeeded in detecting ship embedded in sea clutter and suppressed it with improvement of 45.12dB by Weibull/CFAR processing.

It is important to keep the skin condition healthy since the skin has a function to protect the body from various stimuli in the environment. The monitoring of the skin condition, especially, the amount of water in the stratum corneum which is one of the important indicators for evaluating the skin condition is required. The purpose of this research is to develop a contactless and simple skin moisture measurement system. In this paper, a new contactless electrostatic charged sensor for skin moisture measurement is proposed. The proposed sensor consists of the charge electrode and measurement electrode. The voltage is induced to the measurement electrode by which the proposed sensor approaches and releases the skin. The moisture is estimated by which the voltage depends on the water content of the skin. First, the charge structure of proposed sensor was evaluated. Next, the skin moisture measurement was demonstrated by the proposed sensor. As a result, it was found that the proposed sensor had a potential as contactless moisture sensor although there are some issues should be solved.

In this paper, a contactless differential electrostatic sensor is proposed for removing distance error on the skin wetness measurement. In the proposed sensor, two electrodes with the electrostatic charge plates were arranged at arbitrary different distance for the target. Voltages induced by the electrostatic effect are measured while the proposed sensor approaches and separates from the target. It is possible to remove the influence of distance by differential values on two electrodes although the induced voltage was changed by the distance between the electrode and the target. In the experiment, the induced voltages were measured by the proposed sensor when the distance between the sensor and the target was changed. As a result, it was shown that differential value of induced voltages obtained on two electrodes was constant. Therefore, it was presented that the proposed sensor was usefulness as one of the methods to compensate the error of the distance.

In this paper, we propose a new method to improve the frequency resolution and time resolution of QCM, which measures masses of several nanograms or less by using changes in the resonance frequency of the quartz crystal resonator. Since our method does not use a frequency counter to measure the frequency, there is no waiting time due to the gate time, therefore high-speed frequency measurement is possible. In this method, the output waveforms of two crystal oscillators are sampled directly by a 2-channel AD converter and the phase is calculated by numerical calculation processing on the sampled digital data. The instantaneous frequency is calculated from the time derivative of the obtained phase and converted into the change in mass.

In order to verify the frequency measurement accuracy of the fully digital phase detection QCM, the frequency change simulating the mass change was used and compared with the conventional high-precision differential QCM using reciprocal counter. As a result, it was shown that the frequency resolution and time resolution could be significantly improved.

The purpose of this study is to estimate subjective arousal levels from nasal skin temperature data during exposure to two types of red LEDs using a convolutional neural network. Subjective arousal is estimated from nasal skin temperature and the accuracy was shown to vary depending on the bandwidth of the light.

This study aims to examine technology of estimation to driver's drowsiness using the nasal skin temperature. Five common machine learning techniques were commonly examined for the estimation, and consider the best.

This study investigates a fire detection method using random forest that is one of the machine learning algorithms, which is applied to catch signs from minute temperature changes indirectly measured by a temperature sensor deployed on an idler of a belt conveyor. Belt conveyors are often used outdoors and the ambient temperature changes, which makes it difficult to distinguish them from temperature changes due to fire, especially for a conventional simple threshold determination. Based on features of measured temperature with a trend, random forests classify whether the individual temperature is abnormal or not. It is described that even if the individual classification results include false detections, false classification can be reduced by rearranging the individual results in temporal order. To implement this temporal factor, a method of using the past classification result as a feature quantity is proposed. Simulations are conducted with the feature quantities added the preceding classification result, and it is shown that false detections are eliminated.

The magnetization direction in which the magnetic field becomes the strongest on one axis is derived by the spherical coordinate system. It was found that the magnetic field was strongest at the top and bottom on the axis, and was weakest at the 0 points on the axis. Therefore, it is indicated that there is an optimal division instead of equality when segmenting. Based on the direction of magnetization of the spherical coordinate system, the direction applied in the cylindrical coordinate system and the orthogonal coordinate system is shown. For Halbach sphere and Halbach cylinder, the magnetic field is shown. This magnetization direction is the guiding principle of the design of the magnetic field source, for example, magnetic drag targeting systems and MRI devices. This can be applied not only to the design of magnetic field sources of permanent magnets, but also to the design of electromagnets and superconducting electromagnets.

We successfully made 2D MHD simulation of spherical tokamak (ST) formation and merging using a cylindrical vacuum vessel model with a pair of external poloidal field (PF) coils. We swing down the PF coil currents, forming merging ST plasmas with both of private and common poloidal fluxes and the merging process transform the former flux to the latter flux through magnetic reconnection. Under the fixed amount of PF coil energy, we optimized PF coil position to maximize the private poloidal magnetic flux which reconnects for the reconnection heating.