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13th IEEE Global Conference on Consumer Electronic, GCCE 2024

作者： Takahashi, Kuuta Kawamoto, Shinichi Gunma College Advanced Production Systems Engineering Course Maebashi Japan Gunma College Department of Information and Computer Engineering Maebashi Japan

ISBN: (纸本)9798350355079

In recent decades, digital signages have been widely used. Specifically, digital signages that have a purpose of either providing information or advertising, it is important to direct people's attention toward that information. Conventionally, some approaches to attract viewer's attention include using animation and audible information such as playing background music or a flashing a catchphrase. However, language information has not been implemented in these approaches. In this study, we propose a method to call out a specific person to the front of a digital signage by using color images and depth information. By calling out a specific person by using this method, it is expected for this person to have an awareness that they are a target intended by a digital signage. In this study, we conducted experiments that use utterances based on a person's position, distance from a digital signage, clothing colors, or a pair of two features. Based on the study results, we confirm that a pair of features, that is, clothing color and depth, is the most effective to call out a specific person to the front of a digital signage © 2024 IEEE.

关键词： User interfaces

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Research on Metamaterial Technology for Microwave Wireless Power Transfer

Research on Metamaterial Technology for Microwave Wireless P...

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2024 International Symposium on Antennas and Propagation, ISAP 2024

作者： Yamamoto, Tsunayuki Kobashi, Takeo Maruyama, Tamami Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (纸本)9798350364774

In this paper, two technologies of metamaterial for microwave wireless power transfer are shown. One is a zeroth-order resonance for a microwave snow melting system, and another one is a focusing reflector for realizing of a highly efficient wireless power transfer space. A zeroth-order resonance leads a uniformed microwave heating and a flexibility of feeding in a snow melting system. Focusing reflector can make some electromagnetic hot and null points in a space. These are expected to be required technologies for highly efficient wireless power transfer. © 2024 IEEE.

关键词： Reflection

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Investigation of system-driven talking approaches using depth and color image information for digital signage with speech user interface

Investigation of system-driven talking approaches using dept...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Kuuta Takahashi Shinichi Kawamoto Advanced Production Systems Engineering Course National Institute of Technology(KOSEN) Gunma College Maebashi Japan Department of Information and Computer Engineering National Institute of Technology(KOSEN) Gunma College Maebashi Japan

ISBN: (数字)9798350355079

ISBN: (纸本)9798350355086

In recent decades, digital signages have been widely used. Specifically, digital signages that have a purpose of either providing information or advertising, it is important to direct people’s attention toward that information. Conventionally, some approaches to attract viewer’s attention include using animation and audible information such as playing background music or a flashing a catchphrase. However, language information has not been implemented in these approaches. In this study, we propose a method to call out a specific person to the front of a digital signage by using color images and depth information. By calling out a specific person by using this method, it is expected for this person to have an awareness that they are a target intended by a digital signage. In this study, we conducted experiments that use utterances based on a person’s position, distance from a digital signage, clothing colors, or a pair of two features. Based on the study results, we confirm that a pair of features, that is, clothing color and depth, is the most effective to call out a specific person to the front of a digital signage

关键词： Image color analysis Clothing Color User interfaces Animation Advertising Consumer electronics

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Transient Characteristics of a Centrifugal Pump at Rapid Startup

Transient Characteristics of a Centrifugal Pump at Rapid Sta...

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作者： Tanaka, Teiichi Toyomoto, Takeshi Nasu, Kosuke Tabaru, Michiya Department of Mechanical and Intelligent Systems Engineering National Institute of Technology Kumamoto College 2627 Hirayamashinmachi Yatsushiro866-8501 Japan Production Systems Engineering Course Advanced Courses National Institute of Technology Kumamoto College 2627 Hirayamashinmachi Yatsushiro866-8501 Japan

An experimental and CFD(Computational Fluid Dynamics) study was conducted on the transient behavior of a rapidly starting centrifugal pump. The transient characteristics of the centrifugal pump in the transient period were examined from experimental results. Instantaneous flow rate and pressure were measured at suction and discharge ports of the pump with rotational speed and pump shaft torque when the pump is in transient operation. The suction and discharge pressures of the pump were measured by pressure sensors of the strain gauge type. The unsteady flow rate was calculated based on the pressure difference between two pressure measurement points in the straight suction pipe of the pump. The unsteady pump rotational speed and shaft torque were measured using the highly responsive torque meter. The true pump total head because of the pumping action at the unsteady operation of the pump was able to be calculated by subtracting the apparent pump total head cause by the fluid inertia effect from the measured pump total head. According to the present study, the transient characteristics of the rapid starting pump can be measured using the experimental setup. And it was shown that the dynamic operating point and shaft torque during the pump startup period deviate from the quasi-steady change. Comparing the experimental results with CFD, the reason for the deviation of transient characteristics from quasi-steady change was considered to be due to that the formation of the flow field in the pump during the transient period is delayed relative to the flow field of the steady-state. © Published under licence by IOP Publishing Ltd.

关键词： Centrifugal pumps

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Research on Metamaterial Technology for Microwave Wireless Power Transfer

Research on Metamaterial Technology for Microwave Wireless P...

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International Symposium on Antennas and Propagation (ISAP)

作者： Tsunayuki Yamamoto Takeo Kobashi Tamami Maruyama Department of Integrated Science and Technology National Institute of Technology Tsuyama College Tsuyama-shi Japan Advanced Electronics and Information System Engineering Course National Institute of Technology Tsuyama College Tsuyama-shi Japan Department of Production Systems Engineering Institute of Technology Hakodate College Hakodate-shi Japan

ISBN: (数字)9798350364774

ISBN: (纸本)9798350364781

关键词： Microwave antennas Microwave technology Electromagnetic heating Snow Focusing Wireless power transfer Resonance Metamaterials Electromagnetics Microwave propagation

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MEASUREMENT OF VOID FRACTION DISTRIBUTION WITH SMALL WIRE MESH SENSOR INWATER-AIR TWO-PHASE BUBBLE AND SLUG FLOWS IN VERTICAL SMALL DIAMETER PIPE

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Multiphase Science and Technology 2021年第4期33卷 15-30页

作者： Tsubone, Hiroaki Shiotsuka, Tatsuya Yamashiro, Tomoharu Fujino, Tomohito Department of Creative Engineering National Institute of Technology Ariake College Japan Department of Mechanical and Aerospace Engineering Kyushu University Japan Advanced Production and Information Systems Engineering Course National Institute of Technology Ariake College Japan

Several refrigerants have been developed to solve environmental problems and to create efficient heat exchangers. The optimal design of the heat exchanger depends on the physical properties of the refrigerant. An electrical measurement for the flow characteristics is an effective experimental method. We developed a small wire mesh sensor to measure void fraction distribution parameters in refrigerant-air two-phase flow. Small wire mesh sensors without switching systems can be used for a refrigerant (e.g., HFE-71IPA), which can flow a small electric current under high voltage. For verification of the small wire mesh sensor, instantaneous and time averaged void fraction distribution in water-air two-phase flow in a vertical small diameter pipe was measured and analyzed for both bubble and slug flows. The test channel was a vertical circular 9 mm i.d. glass pipe. Each volumetric flux was 0.2-2.0 m/s for the gas phase and 0.1 m/s for the liquid phase in bubble flow, and 0.5- 1.0 for the gas phase and 0.2-0.3 m/s for the liquid phase in slug flow. The resulting void fraction distribution data were compared with different flow regimes, and past data and literature. The result showed that detail void fraction distribution measurement by using the small wire mesh sensor without switching system is possible for bubble and slug flow. © 2021 Begell House Inc.. All rights reserved.

关键词： Refrigerants

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Improvement of Generating Efficiency of Vertical-axis Wind Turbine with Wind Lens

Improvement of Generating Efficiency of Vertical-axis Wind T...

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IEEE Global Conference on Consumer Electronics (GCCE)

作者： Keita Shimizu Taiga Yoshinari Yamato Muto Hiroyuki Abo Hisao Yaguchi dept. of Advanced Production Systems Engineering Course National Institute of Technology (KOSEN)Gunma College Maebashi Japan dept. of Mechanical Engineering Faculty of Engineering Chiba University Chiba Japan dept. of Aerospace Engineering Graduate School of Engineering Tohoku University Sendai Japan dept. of Mechanical Engineering National Institute of Technology (KOSEN) Gunma College Maebashi Japan

ISBN: (纸本)9781665492331

Offshore large wind turbines attract lots of attention in the decarbonization business. But, the inland region gets left out of this movement. Limited places are suitable for onshore power generation with large propeller wind turbines in Japan. We shed light on vertical-axis small wind turbines which are relatively inexpensive and untroubled. The brimmed diffuser called “Wind Lens” for vertical-axis small wind turbines is studied to improve the generation efficiency of a wind turbine. In this paper, we investigate the influence of the burble inside the wind lens on the amplification of airflow speed using the boundary-layer control technology such as plasma actuator and turbulence tripping. Results show that the wind lens using turbulence tripping is found to be effective to amplify airflow speed.

关键词： Actuators Propellers Low-carbon economy Wind turbines Plasmas Power generation Consumer electronics

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Quantitative investigation of wear properties of soft-metal/DLC nanocomposite by transmission electron microscopy 10

Quantitative investigation of wear properties of soft-metal/...

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10th International Scientific Conference BALTTRIB 2019

作者： Goto, M. Maruyama, M. Department of Mechanical Engineering National Institute of Technology Ube College Japan Advanced Course of Production Systems Engineering National Institute of Technology Ube College Japan

The wear properties of soft-metal/diamondlike carbon nanocomposite coatings (SMe-DLC) sliding against bearing steel ball under reciprocating motion have been investigated quantitatively as a function of the metal content by transmission electron microscopy (TEM). The wear amount of thin and hard coatings under macroscopic contact condition is difficult to measure during relatively short frictional test duration because the wear amount is considered to be a trace amount. So, we have employed TEM to measure the wear loss accurately from the cross-section samples. This study revealed that TEM is an effective tool on the quantitative analysis of wear property of thin tribo-coatings showing high wear resistivity such as DLC. Copyright © 2019 The Authors.

关键词： Wear of materials

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Durability Performance Testing of SiC Diodes for use as Bypass Diodes in Photovoltaic Modules

Durability Performance Testing of SiC Diodes for use as Bypa...

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2020 47th IEEE Photovoltaic Specialists Conference (PVSC)

作者： Toshiyuki Hamada Takumi Kashiwaya Shinnosuke Yoneda Kenta Nakamoto National Institute of Technology Ube College Ube Yamaguchi Japan Advanced Course of Production Systems Engineering National Institute of Technology Ube College Ube Yamaguchi Japan Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Ibaraki Japan

ISBN: (数字)9781728161150

ISBN: (纸本)9781728161167

When a bypass diode (BPD), which is a protective element in the photovoltaic module, fails owing to a short circuit, the faulty BPD generates heat, creating a risk of burnout. In this study, durability tests were conducted simulating the use of three different types of diode-silicon Schottky barrier diode (Si-SBD), PN junction diode (PND), and silicon carbide SBD (SiC-SBD)-as BPDs to investigate the specifications of diodes suitable for use as BPDs. The PND and SiC-SBD models, which have a large forward voltage drop, generated a large amount of heat, and the SiC-SBD model suffered thermal failure at approximately 10 cycles. However, all the diodes exceeded the junction temperature during testing. This reveals the need to implement heat dissipation measures to improve the long-term durability of BPDs.

关键词： Schottky diodes Surges Schottky barriers Photovoltaic systems Temperature measurement Circuit faults Lightning

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A comparative study of bi-directional airflow turbines

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International Journal of Fluid Machinery and systems 2019年第3期12卷 228-234页

作者： Takao, Manabu Fukuma, Seisuke Okuhara, Shinya Alam, M. M. Ashraful Kinoue, Yoichi Department of Mechanical Engineering National Institute of Technology Matsue College 14-4 Nishiikuma MatsueShimane690-8518 Japan Advanced Production and Construction Systems Course National Institute of Technology Matsue College 14-4 Nishiikuma MatsueShimane690-8518 Japan Support Center for Practical Education National Institute of Technology Matsue College 14-4 Nishiikuma MatsueShimane690-8518 Japan Institute of Ocean Energy Saga University 1 Honjo SagaSaga840-8502 Japan

In an oscillating water column (OWC) based wave energy plant, a bi-directional airflow is generated in the air chamber. To harness energy, the bi-directional airflow turbines that rotate in the same direction are used in such wave energy conversion devices. Some turbines for bi-directional airflow have been proposed to date, and their performance were investigated by wind tunnel tests and CFD analyses. Some of the typical turbines have inherent disadvantages, such as severe stall problem and low efficiency. Therefore, authors proposed two unique turbines for bi-directional flow: Wells turbine with booster and counter-rotating impulse turbine. An extensive computational work was conducted to perform a comparative study between the conventional and proposed turbines for bi-directional airflow. © 2019, Turbomachinery Society of Japan. All rights reserved.

关键词： Wave energy conversion

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