Search Results 1-20 of 32200

  • A New Ultra-Thin High Voltage Power Supply Using FPC with Low Expansion Coefficient  [in Japanese]

    指田 和之 , 竹原 奈津紀 , 大貫 仁

    エレクトロニクス実装学会誌 = Journal of the Japan Institute of Electronics Packaging 24(1), 121-129, 2021-01

  • Localization with Portable APs in Ultra-Narrow-Band-based LPWA Networks

    Fukumoto Miya , Yoshihiro Takuya

    … Since many low-price IoT devices usually need to work with limited power budget, this kind of low-power long-range communication technique is a strong tool to populate IoT deployment. …

    Journal of Information Processing 29(0), 149-156, 2021

    J-STAGE 

  • Single-Pass Full-Penetration Welding for Thick Stainless Steel Using High-Current GMAW  [in Japanese]

    BABA Hayato , KADOTA Keiji , ERA Tetsuo , UEYAMA Tomoyuki , MAESHIMA Motoshi , KADOI Kota , INOUE Hiroshige , TANAKA Manabu

    … This paper describes a high-current Gas Metal Arc Welding (GMAW) process using a constant voltage power source developed for high-efficiency welding of thick stainless steel plates. … A "low-frequency modulated voltage control" was applied for stabilizing a high-current arc that can maintain the short arc length without short circuiting. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 39(1), 39-50, 2021

    J-STAGE 

  • Recent Progress and Issues of Diamond Metal-oxide-semiconductor (MOS) Interface for High-Frequency and Power Device Application  [in Japanese]

    MATSUMOTO Tsubasa , ZHANG Xufang , TOKUDA Norio

    … Therefore, diamond is expected as high-frequency, low-loss and high-power device materials. … Our fabricated diamond metal-oxide-semiconductor field-effect transistors (MOSFETs) showed normally off properties, which is important for power devices. … However, the MOSFETs suffer from low field-effect mobility, which is mainly attributed to existence of high interface state density near the valence band edge on diamond. …

    Vacuum and Surface Science 64(2), 80-85, 2021

    J-STAGE 

  • Effective methods to promote heat dissipation of wrist wearables

    Matsuhashi Kodai , Hachiya Koutaro , Kanamoto Toshiki , Kashiwazaki Shinsuke , Kusumi Kyosuke , Kurokawa Atsushi

    … Heat generation due to power consumption may cause both circuit malfunctions and low-temperature burns. …

    IEICE Electronics Express, 2021

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  • Study of the Cavitation Phenomenon Inside Roller Vane Pump

    Zhang Bin , Zhao Chun-xiao , Hong Hao-cen , Bai Da-peng , Yang Hua-yong

    … The negative pressure region near the relief groove has an extreme low pressure at 0.08 MPa, and the maximum flow velocity is 99.3 m/s. …

    International Journal of Fluid Machinery and Systems 14(1), 42-51, 2021

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  • P-09　Improvement of bio diesel fuel combution in ultra low temperature condition by a small diesel engine.  [in Japanese]

    YAMADA Masakazu , YUKUMOTO Masao , KOBAYASI Naoto

    … <p>BDF solidifies at a higher temperature than light oil when placed in a low temperature environment. … The BDF was electrostatically purified, and two types of additives, a low-temperature fluidity improver and a cetane number improver, were added. … Exhaust gas and power generation were measured by putting samples classified according to the presence or absence of two types of additives and electrostatic purification and the storage environment into a small generator and operating it. …

    Proceedings of the Conference on Biomass Science 16(0), 79-80, 2021

    J-STAGE 

  • Characterization of dielectric relaxations in CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> via diverse complex planes: Effect of dipole polarization and dc conductivity

    ZHAO Xue-Tong , ZHENG Wen-Yue , ZHANG Jie-Xin , LIANG Jie , CHEN Han , XU Chao , YANG Li-Jun , LIAO Rui-Jin

    … ceramic as a model sample, a typical dielectric relaxation induced by dipolar polarization is presented in the low-temperature range of 123–163 K. … The activation energies of the low-temperature and high-temperature relaxation peaks are 0.094–0.097 and 0.92–0.93 eV, which corresponds to the bulk defect and grain boundary defect of the CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> …

    Journal of the Ceramic Society of Japan 129(2), 97-104, 2021

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  • Wild Animal Detection and Tracking Drone System Using Centerline Extraction  [in Japanese]

    Tohma Eisaku , Tadakuma Kotaro , Chinen Hibiki , Suriyon Tansuriyavong , Anezaki Takashi

    … The authors have been developing a non-GPS autonomous control drone system for power line inspection, animal detection, and tracking. … We verified the effectiveness of our combination of a deep learning system trained by images taken by a drone equipped with a camera having a wide field of view and flying at low altitude for image magnification, and our centerline extraction method for more accurate discrimination of wild boars.</p> …

    IEEJ Transactions on Industry Applications 141(2), 155-160, 2021

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  • Design and Verification of Ultra-small Processor with Specializes Binarized Neural Network  [in Japanese]

    Masubuchi Tomokazu , Ito Yuya , Tsuda Norio , Goshima Keishiro

    … However, it is also necessary to use a low-power consumption and small-scale processor with a neural network for an embedded image-processing system. …

    IEEJ Transactions on Electronics, Information and Systems 141(2), 165-171, 2021

    J-STAGE 

  • A Voltage Control Method for Distribution System by Coordinating LRT and DG Power Factors  [in Japanese]

    Takenawa Riku , Nagata Takeshi

    … <p>Currently, the introduction of renewable energy is progressing globally toward the realization of a low-carbon society. …

    IEEJ Transactions on Power and Energy 141(2), 97-102, 2021

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  • A Study on AM-AM/PM Characteristics of a Single-Stage HBT Power Amplifier

    TANAKA Satoshi

    … In order to increase the transmission speed in 5G mobile phones, the multi-level of the modulated signal is advanced, and for that, the power amplifier (PA) high linearity is required even at low output power. … As a performance index of the distortion of the PA, the output power dependence of the gain and phase, the AM (Amplitude Modulation)-AM/PM (Phase Modulation) characteristic is well known. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E104.A(2), 484-491, 2021

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  • A Low-Power Current-Reuse LNA for 3D Ultrasound Beamformers

    NAKAMURA Yohei , KAJIYAMA Shinya , IGARASHI Yutaka , OSHIMA Takashi , YAMAWAKI Taizo

    … <p>3D ultrasound imagers require low-noise amplifier (LNA) with much lower power consumption and smaller chip area than conventional 2D imagers because of the huge amount of transducer channels. … This paper presents a low-power small-size LNA with a novel current-reuse circuitry for 3D ultrasound imaging systems. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E104.A(2), 492-498, 2021

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  • A 26-GHz-Band High Back-Off Efficiency Stacked-FET Power Amplifier IC with Adaptively Controlled Bias and Load Circuits in 45-nm CMOS SOI

    YOSHIMASU Toshihiko , FANG Mengchu , SUGIURA Tsuyoshi

    … <p>This paper presents a 26-GHz-band high back-off efficiency power amplifier (PA) IC with adaptively controlled bias and load circuits in 45-nm CMOS SOI. … A 4-stacked-FET is employed to increase the output power and to conquer the low breakdown voltage issue of scaled MOSFET. … The PA IC exhibits a saturated output power of 20.5dBm and a peak power-added-efficiency (PAE) as high as 39.4% at a supply voltage of 4.0V. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E104.A(2), 477-483, 2021

    J-STAGE 

  • Temperature-Robust 0.48-V FD-SOI Intermittent Startup Circuit with 300-nA Quiescent Current for Batteryless Wireless Sensor Capable of 1-μA Energy Harvesting Sources

    SUDO Minoru , UTSUNOMIYA Fumiyasu , TANAKA Ami , DOUSEKI Takakuni

    … The ISC consists of an ultralow-voltage detector composed of a depletion-type MOSFET and low-Vth MOSFETs, a Dickson-type gate-boosted charge pump circuit, and a power-switch control circuit. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E104.A(2), 506-515, 2021

    J-STAGE 

  • A Differential on Chip Oscillator with 1.47-μs Startup Time and 3.3-ppm/°C Temperature Coefficient of Frequency

    ZHANG Guoqiang , CAO Lingjin , YAYAMA Kosuke , KATSUSHIMA Akio , MIKI Takahiro

    … <p>A differential on chip oscillator (OCO) is proposed in this paper for low supply voltage, high frequency accuracy and fast startup. … The differential architecture helps the OCO achieve a good power supply rejection ratio (PSRR) without using a regulator so as to make the OCO suitable for a low power supply voltage of 1.38V. … for low supply voltage operation. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E104.A(2), 499-505, 2021

    J-STAGE 

  • EQUIPMENT CONSTITUTION AND OCCUPANT BEHAVIOR IN A NET ZERO ENERGY HOUSE CONSIDERING STAYING AT HOME DURING POWER OUTAGES  [in Japanese]

    INABA Manae , KIM Jungmin , OKI Reina , AKIMOTO Mizuho , TANABE Shin-ichi , MORITO Naomi

    … <p> The goal of this study is to propose combinations of equipment, including photovoltaic (PV) power generation and storage battery (BT) charging, in a net zero energy house (ZEH) that considers sheltering at home during power outages. … To validate the resilience performance of houses in various conditions compared to a ZEH house, the self-sufficient rate during power outages was calculated based on PV capacity, BT capacity, and insulation performance. …

    Journal of Environmental Engineering (Transactions of AIJ) 86(779), 111-120, 2021

    J-STAGE 

  • Dielectric Properties of a BaTiO<sub>3</sub>/REBa<sub>2</sub>Cu<sub>3</sub>O<i><sub>y</sub></i> Multilayered Structure for Low-Loss Capacitors  [in Japanese]

    MORIGUCHI Yoshiyasu , TSUCHIYA Yuji , ICHINO Yusuke , YOSHIDA Yutaka

    … <p>A high Q value for resonant circuits is necessary for wireless power transfer. … thus, it is important to use elements with a low internal resistance such as superconductors. …

    TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 56(1), 32-37, 2021

    J-STAGE 

  • Secure Cryptographic Unit as Root-of-Trust for IoT Era

    MATSUMOTO Tsutomu , IKEDA Makoto , NAGATA Makoto , UEMURA Yasuyoshi

    … For ensuring IoT security, it is desirable to create a situation that even a terminal component device with many restrictions in computing power and energy capacity can easily verify other devices and data and communicate securely by the use of public key cryptography. … To concretely achieve the big goal of penetrating public key cryptographic technology to most IoT end devices, we elaborated the secure cryptographic unit (SCU) built in a low-end microcontroller chip. …

    IEICE Transactions on Electronics, 2021

    J-STAGE 

  • Energy-Efficient Post-Processing Technique Having High Extraction Efficiency for True Random Number Generators

    ZHANG Ruilin , WANG Xingyu , SHINOHARA Hirofumi

    … However, as the N value increases, the mapping table complexity increases exponentially (2<i><sup>N</sup></i>), which made VN_N unsuitable for low-power TRNGs. … To develop a technique with high ExE and low-cost, we designed and fabricated an 8-bit von Neumann with waiting strategy (VN_8W) in a 130-nm CMOS. … At 0.45 V and 1 MHz, VN_8W achieved the minimum energy of 0.18 pJ/bit, which was suitable for sub-pJ low energy TRNGs.</p> …

    IEICE Transactions on Electronics, 2021

    J-STAGE 

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