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8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Uda, Ibuki Fujii, Katsuyuki Okumura, Yasuyuki Graduate Program of Mechatronics Graduate School of Science and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Department of Mechatronics Nagoya Japan

ISBN: (纸本)9781728135755

A communication medium known as a wearable two-dimensional communication sheet that can locate multiple small devices on clothes is being researched. By wearing the sheet, the desired communication may not be achieved because the sheet is bent owing to human movement. Therefore, in this study, we employ the finite-difference time-domain (FDTD) method to evaluate the electric field distribution inside the sheet in the 2.4-GHz band by considering the bending angle of the sheet to be a parameter. © 2019 IEEE.

关键词： Finite difference time domain method

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Superposition of Next Generation PON to Existing PON's OOK Signals 8

Superposition of Next Generation PON to Existing PON's OOK S...

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8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Ogawa, Shoki Okumura, Yasuyuki Fujii, Katsuyuki Graduate Program of Mechatronics Graduate School of Sience and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Department of Mechatronics Nagoya Japan

ISBN: (纸本)9781728135755

Recent research into raising the speed and capacity of optical access networks has focused on converting RF (Radio Frequency) signals into optical signals. One approach to efficient transmission, combining wide spread OOK (ON-OFF Keying) systems with phase modulation, is being actively researched. However, studies to date have considered only the downlink. This paper focuses on the uplink of optical access networks and proposes a method for demodulating superimposed OOK and phase modulation signals. © 2019 IEEE.

关键词： Amplitude shift keying

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Evaluation of TCM to Coexisting OOK and PSK in optical access 8

Evaluation of TCM to Coexisting OOK and PSK in optical acces...

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8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Kuno, Yuki Okumura, Yasuyuki Fujii, Katsuyuki Graduate Program of Mechatronics Graduate School of Sience and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Department of Mechatronics Nagoya Japan

ISBN: (纸本)9781728135755

Studies for enhancing network speed and capacity to handle the rapid increases in traffic are being conducted. Even in optical access, which is the backbone network, studies on next generation modulation schemes that utilize phase and amplitude, rather than modulation by conventional light intensity, are being conducted. However, it is difficult to update all the terminals at once, and there is a possibility that signals with old and new modulation schemes coexist on one optical fiber. Such situations are known to yield high error rates. Therefore, this study evaluates the effectiveness of TCM (Trellis Coded Modulation), which is an error correcting scheme. © 2019 IEEE.

关键词： Phase shift keying

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Antibacterial and Photocatalytic Dye Degradation Activities of Green Synthesized NiSe Nanoparticles from Hibiscus rosa-sinensis Leaf Extract

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Water (Switzerland) 2023年第7期15卷 1380页

作者： Velayutham, Lakshmi Parvathiraja, C. Anitha, Dhivya Christo Mahalakshmi, K. Jenila, Mary Gupta, Jeetendra Kumar Wabaidur, Saikh Mohammad Siddiqui, Masoom Raza Aftab, Sikandar Lai, Wen-Cheng Palayamkottai Manonmaniam Sundaranar University Tamilnadu Tirunelveli627012 India Department of Physics Manonmaniam Sundaranar University Tamilnadu Tirunelveli627012 India Chemistry Department College of Science King Saud University Riyadh11451 Saudi Arabia Department of Intelligent Mechatronics Engineering Sejong University 209 Neungdong-ro Gwangjin-gu Seoul05006 Korea Republic of Bachelor Program in Industrial Projects National Yunlin University of Science and Technology Douliu640301 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology Douliu640301 Taiwan

Ecosystems worldwide face a serious and life-threatening water crisis due to water contamination. Nanotechnology offers a promising solution to this issue by providing methods for removing pollutants from aquatic sources. In this study, we utilized a green and simple approach to biosynthesize NiSe NPs using Hibiscus rosa-sinensis extract as the bio-source. The plant extract acts as a reducing, stabilizing, and capping agent in the synthesis process. A simple hydrothermal method was employed to blend the NiSe NPs photocatalysts. UV-Visible DRS spectroscopy was utilized to confirm the reduction in and stabilization of Ni2+ and Se2− ions. The resulting NiSe NPs have a bandgap of 1.74 eV, which facilitates electron and hole production on their surfaces. To characterize the functional groups on the NiSe NPs and their surface interactions with bio-compounds, FTIR spectroscopy was utilized. XRD analysis revealed the crystallite size of the NiSe NPs to be 24 nm, while FE-SEM and TEM imaging showed their spherical shape and material distribution. EDX spectroscopy confirmed the integrity of the NiSe NPs’ material. XPS analysis provided information on the chemical composition, nickel and selenium valency, and their interface. The efficacy of the NiSe NPs as a blended photocatalyst in photodegrading Methylene Blue (MB) dye was tested under visible light, resulting in 92% degradation. Furthermore, the NiSe NPs exhibited bactericidal activity against Escherichia coli and Staphylococcus aureus bacteria due to their advanced oxidation and reduction in charge particles, which increased the degradation efficiency and suppressed cell proliferation. Based on the obtained findings, the NiSe NPs show promise as a powerful agent for water remediation and microbial resistance. © 2023 by the authors.

关键词： Degradation

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Quality Monitoring Methodology for Micro-Shrinkage of Thick-Walled Injection Molded Components

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SSRN 2022年

作者： Huang, Ming-Shyan Chen, Jian-Yu Xiao, Yu-Qi Department of Mechatronics Engineering National Kaohsiung University of Science and Technology 1 University Road Yanchao Dist. Kaohsiung City824 Taiwan Bachelor’s Program of Precision System Design Feng Chia University 100 Wenhwa Road Seatwen Taichung City40724 Taiwan

Sink mark degrades the surface quality of the thick-walled injection molded components. An effective method for quantifying sink marks, and predicting the occurrence of such defects as a function of the injection molding process parameters, are of significant interest in improving the molding quality. The present study proposes a method for measuring the micro-shrinkage using a simple image-processing technique. Simulation and experimental trials are performed to investigate the effects of injection molding parameters on the quality of the polymer melt (as evaluated using quality indexes extracted from the pressure profiles within the chamber and the tie-bar elongation, respectively) and the quality of the final molded component. The sink mark is determined mainly by the holding pressure. The quality indexes revealed in this study are all highly correlated with micro-shrinkage. They provide a viable means of predicting the formation of sink marks and excessive micro-shrinkage in thick-walled injection molded components. © 2022, The Authors. All rights reserved.

关键词： Injection molding

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Numerical Evaluation of Low-Head Inverted Cross-Flow Turbine Design Methodology: A Comprehensive Study

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SSRN 2023年

作者： Ha, Hojin Ham, Sangwoo Ehsan, Adeeb Lee, Jeong Wan Interdisciplinary Program in Biohealth-Machinery Convergence Engineering Kangwon National University 1 Kangwondaehak-gil Gangwon-do Chuncheon-si24341 Korea Republic of Division of Mechanical & Biomedical Mechatronics and Materials Science and Engineering Kangwon National University 1 Kangwondaehak-gil Gangwon-do Chuncheon-si24341 Korea Republic of Kangwon Institute of Inclusive Technology Kangwon National University 1 Kangwondaehak-gil Gangwon-do Chuncheon-si24341 Korea Republic of

In this study, we aim to address the challenges of micro-hydropower generation in low-head environments. The authors reviewed and assessed various factors affecting the feasibility of micro-hydro systems, such as geographical constraints, construction costs, and grid connectivity. To overcome the limitations of conventional hydro turbines in such conditions, the authors proposed a novel cross-flow turbine. Initially, they designed and analyzed an inverted cross-flow turbine based on design rules established by previous researchers and performed numerical analyses. Four steps parametric studies were conducted to achieved optimum turbine values, such as runner diameter ratio and the number of blades, considering the maximum efficiency point from the previous step. The best efficiency point of the optimized design turbine was 72.92 % at a runner rotational speed of 170 RPM with a 0.75 runner diameter ratio and 35 blades. To validate the optimized design, the authors compared it with the initial design using hill charts and numerical values obtained from parametric studies. Overall, this research demonstrates the usefulness of computational fluid dynamics simulations and parametric studies in optimizing the design of an inverted cross-flow turbine under low head conditions. © 2023, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Study on the reduction of the local specific absorption rate of a 1.2-GHz- band transceiver with a reflector 8

Study on the reduction of the local specific absorption rate...

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8th IEEE Global Conference on Consumer Electronics, GCCE 2019

作者： Kumita, Yu Fujii, Katsuyuki Okumura, Yasuyuki Graduate Program of Mechatronics Graduate School of Science and Engineering Nanzan University Nagoya Japan Faculty of Science and Engineering Nanzan University Nagoya Department of Mechatronics Nagoya Japan

ISBN: (纸本)9781728135755

Amateur radio stations, which use greater radiation power than smartphones, are expected to have a high specific absorption rate (SAR). However, few studies have explored the electromagnetic wave exposure in amateur stations. In this paper, we propose mounting a reflector on a 1.2-GHz-band monopole antenna that is mounted on a transceiver-simulating metallic case. Numerical analysis was performed through the finite-difference time-domain (FDTD) method using a simple brain-equivalent model and a numerical model of the human body. The results demonstrated that the SAR can be reduced through the proposed method without greatly altering the antenna characteristics. © 2019 IEEE.

关键词： Reflection

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On the Optimization of the Semi-Active Suspension for a Railway Vehicle

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IFAC-PapersOnLine 2020年第2期53卷 8494-8499页

作者： Aslı Soyiç Leblebici Semiha Türkay Mechatronics Program Eskisehir Osmangazi University Eskisehir Turkey. Electrical Engineering Department Eskisehir Technical UniversityEskisehir Turkey

In this study, a nine-degrees-of-freedom full wagon railway model with linear parameters is used to study the vehicle’s vibrational response on the random rail data collected by Turkish State Railways Research Center (TCDD-DATEM). The performance of suspension system is determined by comparing the body vertical, pitch and roll accelerations, and suspension travels to assess ride comfort and handling properties of the vehicle. The semi-active suspension system is designed for three different controllers;skyhook, groundhook and hybrid since these approaches feature simplicity and lower cost compared to their active counterparts. For the proposed controllers, their effectiveness is validated by simulation results performed in MATLAB by comparing the achieved time responses.

关键词： Railway vehicle skyhook control groundhook control hybrid design multi-objective control

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Influence of Phase Transformation Coefficient on Thermomechanical Modeling of Laser Powder Bed Fusion for Maraging 300 Steel

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SSRN 2024年

作者： dos Santos Silva, Bruno Caetano de Figueiredo Soares, Lucas Coelho, Rodrigo Santiago Sitek, Wojciech Król, Mariusz Batalha, Gilmar Ferreira University Center SENAI CIMATEC SENAI Innovation Institute for Forming and Joining of Materials Av. Orlando Gomes 1845 Piata BA Salvador41650-010 Brazil Department of Mechatronics and Mechanical Systems Engineering Polytechnic School of Engineering University of Sao Paulo Av. Prof. Mello Moraes 2231 Butantã SP Sao Paulo05508-030 Brazil University Center SENAI CIMATEC Post-Graduation Program MPDS/GETEC/MCTI Av. Orlando Gomes 1845 Piata Salvador-BA41650-010 Brazil Department of Engineering Materials and Biomaterials Faculty of Mechanical Engineering Silesian University of Technology 18A Konarskiego St. Gliwice44-100 Poland

Manufacturing maraging steel components using laser-based powder bed fusion (LPBF) presents an attractive proposition for industries due to the material's combination of mechanical properties such as hardness, wear resistance, and toughness, and the capability to produce parts with complex geometries and high precision. Despite these advantages, the LPBF process induces defects such as distortion and residual stress associated with the complex thermal cycles, compromising final part quality. Numerical simulations have been developed to predict these defects. However, LPBF simulations remain challenging due to the complexity of the process and the substantial computational resources required. For maraging steel, for example, the occurrence of phase transformation promotes compressive stress that interferes in results and makes simulations inaccurate. This research aims to simulate a geometry with a circular inner channel and investigate distortion, volume fraction of martensite and equivalent stress results. Modeling was performed by varying phase transformation rate parameters to assess the impact of transformations on simulation outcomes. Results showed minimal impact of these parameters on distortions and equivalent stress. Equivalent stress results were compared with literature findings, while distortion results were validated against experimental data to validate the accuracy of the model. © 2024, The Authors. All rights reserved.

关键词： Phase transitions

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HMI design of autonomous electric wheelchair for patients mobility in the hospital

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AIP Conference Proceedings 2024年第1期3069卷

作者： Kadek Heri Sanjaya Yukhi Mustaqim Kusuma Sya'Bana Nugrahaning Sani Dewi Muqorob Tajalli M. Maulana Damaringrat Ryo Prasetyo Nugroho Raynaldi Aryasena Research Center for Smart Mechatronics National Research and Innovation Agency (BRIN) Bandung Indonesia Biomedical Engineering Study Program Institut Teknologi Sepuluh Nopember (ITS Surabaya) Surabaya Indonesia

With the pandemic and physical distancing requirements, there is a need for patients to be able to perform mobility with greater independence in the hospital environment. As such, the development of an autonomous electric vehicle (AEV) for a smart wheelchair is necessary. The aim of this study is to make the design concept of a human-machine interface (HMI) for a smart wheelchair. The base for the smart wheelchair is an autonomous vehicle prototype designated as an autonomous individual mobility system (AIMS). The design methodology was started by formulating the design concept, through the review of several references that have information on the HMI modalities. From those studies, we propose an HMI system for the autonomous wheelchair to be operated in the hospital. The system receives input from sensors such as color sensor, ultrasound, infra-red sensor, and an LCD touchscreen. Those sensors are connected to a microcontroller, which in turn commands the operation of the motor driver and electric motor. The control also includes smartphone control so that the patients may control the wheelchair through their interaction with the smartphone. In this conceptual design, we also consider the operational smart system to serve the patients. The concept will make the smart wheelchair become easier to use so that it will have greater accessibility to various patients.

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