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Journal of Mechanical and Electrical Intelligent System (JMEIS, J. Mech. Elect. Intel. Syst.) An international open-access peer-reviewed journal ISSN 2433-8273
Vol.4, No.2
TABLE OF CONTENTS
Articles
Personal Respiratory Air Purification Device (Helmet-type): Distancing-Free Mask (Prototype No.5) Yusaku Fujii, Akihiro Takita Journal of Mechanical and Electrical Intelligent System, Vol.4, No.2, pp.1-5, 2021. Abstract: The Distancing-Free Mask, which is an inexpensive and high-performance helmet-type respiratory air purification device, is improved. Its wearers can go out freely even when the lockdown is needed, since they cannot be infected from others and cannot infect others. We propose a new social system, in which the lockdown is not needed, by means of spreading the devices throughout the society.
Personal Respiratory Air Purification Device (Booth-type): Distancing-Free Booth (Prototype No.1) Yusaku Fujii, Akihiro Takita Journal of Mechanical and Electrical Intelligent System, Vol.4, No.2, pp.6-12, 2021. Abstract: The Distancing-Free Booth, which is an inexpensive and high-performance booth-type respiratory air purification device, has been developed. This is a variation of Distancing-Free Mask, which has been developed by the authors as an inexpensive and high- performance helmet-type respiratory air purification device. Anyone, who uses Distancing-Free Booth and Mask all the time when he/she is outside his/her home, he/she can be allowed to go out freely even when the lockdown is deemed necessary. We propose a new social system, in which the lockdown is not needed, by means of spreading these devices throughout the society.
A Novel Operation Method to Precisely Control Synaptic Strength for Phase-Change Artificial Synapse You Yin Journal of Mechanical and Electrical Intelligent System, Vol.4, No.2, pp.13-18, 2021. Abstract: In this work, a novel operation method was proposed to control the synaptic strength in phase-change artificial synapse by applying staircase pulses. In the device, the recrystallization process was well controlled to achieve this aim. Simulation results exhibited that the phase change material was heated above its melting point during the first subpulse of the staircase pulse and then annealing temperature can be controlled by only varying amplitude of the second subpulse. This implied that the recrystallization region was precisely controllable by applying staircase pulses. Conductance (synaptic strength) change as a function of the amplitude of the second subpulse, which is caused by the growth and the shrinkage of recrystallized region, was obtained at each width of second subpulse.
Electromagnetic Analysis of Antenna Used for Optical Rectenna Keisuke Yanagisawa, Takashi Akahane, You Yin Journal of Mechanical and Electrical Intelligent System, Vol.4, No.2, pp.19-24, 2021. Abstract: Nowadays, energy consumption is rapidly increasing and more and more renewable energy is demanded to reduce the emission of CO2 since global warming has become a very serious problem for us. Solar cells are popular and widely used worldwide because almost no CO2 is emitted during energy generation. However, their power conversion efficiencies are not high enough and costly. In order to solve these problems, optical rectenna was proposed and researched in recent years. In this work, we focused on the antenna, an important part of optical rectenna. We proposed and simulated three types of possible antennas for optical rectenna by electromagnetic analysis. Patch antenna, one of these antennas exhibited very good directivity, implying that it is suitable for the optical rectenna.
Frequency Estimation Sampling Circuit with Hilbert Filter and Proactive Usage of Aliasing Phenomenon Yudai Abe, Shogo Katayama, Anna Kuwana, Haruo Kobayashi Journal of Mechanical and Electrical Intelligent System, Vol.4, No.2, pp.25-34, 2021. Abstract: This paper describes a high-frequency signal estimation circuit using an analog Hilbert filter and multiple low-frequency sampling circuits followed by analog-to-digital converters (ADCs); here the sampling frequencies are relatively prime. Our proposed waveform sampling system uses aliasing phenomena of sampling in frequency domain proactively, and the input signal frequency can be estimated based on the residue number theory. A conventional high frequency sampling circuit can directly estimate a high frequency input signal, but handling of high frequency signals in electronic circuits is difficult; on the other hand, the proposed circuit is relatively easy to implement. Cosine wave with high frequency is provided as an input signal, and then cosine and sine signals with the same frequency are generated with an analog Hilbert filter (such as an RC polyphase filter); they are fed into sampling circuits with different (relatively prime) and low sampling frequencies. Their analog outputs are analog-to-digital converted and for their digital outputs, complex FFTs are performed. Since the high frequency signal is sampled with low frequency clocks, the aliasing (spectrum folding) occurs. However, each aliased frequency is different from each other because each sampling clock frequency is different in sampling circuits. Then based on the Chinese remainder theorem, the input frequency can be estimated. Notice that usage of the analog Hilbert filter is new in this paper; if the analog Hilbert filter is not used and the cosine input is directly sampled, the residue frequency cannot be obtained.
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