The generation of magnetic fields by wireless power transmission (WPT) systems has the potential to impact nearby electronic devices and may also pose a risk to human health. It is therefore imperative that an accurate evaluation of these fields be conducted. Conventional techniques frequently encounter difficulties in the efficient analysis of complex magnetic field distributions generated by multiple coils and intricate configurations. This study proposes a method utilising vector potentials to facilitate an intuitive and efficient evaluation of the magnetic field characteristics of WPT systems comprising multiple coils. By calculating the vector potential for different configurations, this approach enables a clear understanding of the impact of different magnetic field structures on leakage fields and dosimetry evaluations. A comparison with CST Studio simulations confirmed the high accuracy and significantly reduced computational cost of the proposed method, making it a valuable tool for assessing safety and enhancing the design of complex WPT systems.

The PAS (publicly available specification) of APD (absorbed power density) conversion method using SAR (specific absorption rate) at 6 - 10 GHz have been published by IEC. However, the possibility of conversion method in actual measurement was rarely discussed. In this study, the APD conversion method was performed in flat phantom using the conformity assessment system to validate the method. The converted APD from SAR measurement was agreed with the numerical reference within the range of uncertainty. The result indicates the validity of the APD conversion method in a flat phantom.

IoT technology is expected to continue its expanding, and considered a necessary technology for all engineering fields. Then we proposed an IoT education program for beginners aimed at the group which was consisted by students from various engineering fields. IoT education program we proposed is using PBL method, and incorporated the Kolb’s experiential learning method. Our class is the year-round classes, first of all, our students worked on the “skills improvement training”, and then they developed “Rover” as an IoT system according to our education program. In the “skills improvement training”, students experienced 3 trainings of IoT basic, basic of mechatronics and IoT application. Then, using these knowledge, students firstly produced basic rover. After that, students produced remotely operated rover and autonomous rover respectively. Thus, students produced hybrid rover. Results of conducting IoT education program we proposed was found that by creating IoT systems multiple times, knowledge was acquired and retained through the effect of experiential learning, and also found that education program we proposed was effectiveness to the various filed students. IoT Knowledge of the students was acquired and retained even when the students of information and communication engineering did not include our class.

In the present paper, an optimal and easy determination way of flight time t_i in Null Collision method was proposed. Results and computational times have compared to conventional Lin and Bardsley's method by calculating electron swarms in several gases, such as Helium and Argon. It is found that the results of electron swarms are in good agreement between them and the computational times of the swarms become >1.5 times faster (Max.13 times faster) than the conventional method. The key of speed up is less numbers of free flight time calculation, so mean numbers of flight time calculation have been derived and made comparisons. The results show similar tendencies in each gas. The present method would be very helpful to calculate in condition of numerous collisions occurrence, such as atmospheric discharges.

Since the eddy current loss of the Soft Magnetic Composite cores (SMC cores) is smaller than that of the stacked core, it is suitable for reducing the iron loss in high frequency applications. In this study, iron loss characteristics under sinusoidal and inverter excitation conditions are evaluated for SMC core made of insulated pure iron powder. The SMC core showed lower iron loss in the frequency range of about 1 kHz or over under sinusoidal excitation and about 400 Hz or over under inverter excitation compared with the stacked core of 0.35 mm thick electrical steel sheet. Furthermore, inverter iron losses of SMC core measured under various excitation conditions and harmonic components included in the excitation waveform were analyzed and the relationship was formulated. The calculated inverter iron losses agreed with the experimental results with high accuracy.

The magneto-optical (MO) interferences in optical cavities consisting of magnetic stacked films were theoretically analyzed for chemical and biological sensing applications. The MO cavity systems indicated large MO enhancements and sharp responses to the changes in the environmental refractive. The resolution of refractive index was approximately seven times higher than that of conventional surface plasmon sensors.

This study focused on the cultural beliefs of elementary school teachers to identify the factors that lead to gender differentiation in the humanities and sciences. The results suggest that teachers are more likely to identify boys as “science-oriented” and less likely to identify girls as “science-oriented,” regardless of the student's academic ability. This tendency was particularly strong among female teachers with stronger gender-related cultural beliefs. The results suggest that the cultural beliefs of female teachers, in particular, may be related to students' perceptions of being science-oriented, highlighting the need to eliminate gender bias in education.