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Change of electrical and Transport Properties of Nickel Oxide by Carrier Concentration and Temperature through First‑Principle Calculations

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Nanomanufacturing and Metrology 2023年第4期6卷 109-118页

作者： Nayem Md.Reza Shah Chang‑dong Yeo Minyeong Choi Yang‑Ki Hong Jeong H.You Department of Mechanical Engineering Texas Tech UniversityLubbockTX 79409USA Department of Electrical and Computer Engineering and Material Science Ph.D.Program The University of AlabamaTuscaloosaAL 35487USA Department of Mechanical Engineering School of EngineeringUniversity of St.ThomasSt.PaulMN 55105USA

Nickel is typically used as one of the main components in electrical contact devices or *** oxide(NiO)is usually formed on the surfaces of electrodes and can negatively impact system performance by introducing electrical contact *** thermal,electrical,and transport properties of NiO,as a Mott insulator or a p-type semiconductor,can be altered by operating and environmental conditions such as temperature and stress/strain by *** this study,we inves-tigate the fundamental material properties of NiO through the first-principle ***,we obtain and compare the lattice parameter,magnetic moment,and electronic structure for NiO via the WIEN2K simulations with four different poten-tials(i.e.,GGA,GGA+U,LSdA,and LSdA+U).Then,using the WIEN2K simulation results with LSdA+U potential that produces a highly accurate bandgap for NiO,we calculate the electrical conductivity and electrical part of the thermal conductivity of nickel and NiO as a function of temperature and carrier concentration through the BoltzTraP *** simulation results revealed that the electrical conductivity relative to the relaxation time for NiO increases with the carrier concentration,while it shows a slightly decreasing trend with temperature under a fixed carrier *** contrast,the electrical part of the thermal conductivity shows an increasing trend considering carrier concentration and temperature.

关键词： Nickel oxide Magnetic moments density of states Seebeck coefcient electrical conductivity

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Micro-Cantilever Array With Electroplating Tin Bumps for Flip-Chip Bonding Technology

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IEEE Transactions on Components, Packaging and Manufacturing Technology 2023年第12期13卷 2040-2045页

作者： Hu, Zihsong Liou, Chengshiun Tsou, Chingfu Feng Chia University Department of Automatic Control Engineering Taichung40724 Taiwan Institute of Nano Engineering and Microsystems National Tsing Hua University Hsinchu30013 Taiwan Feng Chia University Doctorate Degree of the Ph.D. Program of Electrical and Communications Engineering Taichung40724 Taiwan

A Nickel (Ni) microcantilever beam array with tin (Sn) solder bumps has been designed for flip-chip bonding with high-density electrodes. Micro-electro-mechanical system (MEMS) technology and the micro-electroplating process were used in the fabrication process. Utilizing the out-of-plane deformation of the suspended microcantilever beam, the satisfied heights partially compensate the substrate curvature to ensure a high flip-chip bonding yield, thus, improving package quality in terms of electrical connections. To demonstrate this technique, this study developed a flip-chip carrier for a typical micro-LEd array with a beam length of 70~ μm and a bump height of 2~ μm. The measurement results revealed that the displacement of the microcantilever beam was approximately 0.8~ μm when a 500~ μN force was applied on top of the tin bump. When a glass substrate directly mounts to the flip-chip carrier through the tin bump at a heat reflow of 270 °C, most of the tin bumps successfully melt and solidify, which results in good bonding performance. These results revealed that the proposed approach could be applied to the wafer-level packaging process with high-density ball grid array electrodes. © 2011-2012 IEEE.

关键词： Flip chip devices

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Visual Field Examination Technology Based on Semi-transparent Elliptical Mirror 6

Visual Field Examination Technology Based on Semi-transparen...

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6th IEEE Eurasian Conference on Educational Innovation, ECEI 2023

作者： Chang, Chao-Kai Chiang, Chun-Yu Yeh, Feng-Ming Lee, Chi-Hung Tien, Chuen-Lin Chen, der-Chin Department of Optometry Yuanpei University of Medical Technology Hsinchu Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Electrical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9798350334289

In this study, the human visual field test technology is established by using an optoelectrical system consisting of a translucent ellipsoid, an area light source, and a landscape scene with an indicator. during the test, the subjects stared at the indicator directly in front of them with one eye and kept their eyeballs still, scanning the light strip with peripheral vision and using the mouse button plus the playback program to record the start and end positions of the scanning light strip in the landscape scene. This method is tested subjectively, and the subject needs to respond during the test. Therefore, before the test, the subject needs to understand the test process and be trained in advance to improve the exam accuracy. In the experiment, fifteen subjects with normal vision and no eye disease were selected. Their visual fields were confirmed normal after a preliminary assessment. The test results showed that the subjects' eyes were within the normal visual field, indicating that this method was feasible. In this research, a digital optical platform for the near visual field is proposed to establish an optoelectric visual field measurement technology. The proposed method is characterized by small size, rapid operation, and easy portability. With the digital LCd and visual imaging technology, both dynamic and static visual fields can be tested. The test data on the eyes' upper, lower, nasal, and temporal sides were consistent with the normal visual field. This shows that this method is feasible and worthy of promotion in the optometry industry. © 2023 IEEE.

关键词： Light sources

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danceOnStage: positioning training of dancing stage performance in virtual reality 6

DanceOnStage: positioning training of dancing stage performa...

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6th IEEE International Conference on Artificial Intelligence and eXtended and Virtual Reality, AIxVR 2024

作者： Wu, Ssu-Hsuan Wang, Kai-Ting Chiang, Chia-Chen Chang, Hsin-Yu Yeh, Cheng-Yun Hu, Min-Chun National Tsing Hua University International Intercollegiate Ph.D.Program Hsinchu Taiwan National Tsing Hua University Master of Computer Science Program Hsinchu Taiwan National Tsing Hua University Interdisciplinary Program of Electrical Engineering and Computer Science Hsinchu Taiwan National Tsing Hua University Interdisciplinary Program of Technology and Art Hsinchu Taiwan National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9798350372021

This research aims to create a virtual reality-based practice system that simulates real-stage performance environments, assisting amateur dancers in overcoming stage fright and practicing group choreography that is difficult to achieve during individual practice. In this study, users can engage in performance simulations within the created system using the HTC VIVE virtual reality device. Within the system, we have developed a virtual stage space system that only requires a 2m x 3.5m physical area to simulate a large virtual stage experience. Users can also simulate choreographic positioning with virtual dance partners within this system, providing amateur dancers with group dance rehearsal practice opportunities that are not feasible during solo practice. Additionally, by creating three different audience modes, we aim to help users simulate various audience scenarios they may encounter during a performance. The system includes a recording feature that captures users' simulated performances, allowing them to review their actions and receive feedback after practice. © 2024 IEEE.

关键词： Virtual reality

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New type of optical machine system for object depth sensing

New type of optical machine system for object depth sensing

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Optical Technology and Measurement for Industrial Applications Conference 2023

作者： Chen, Kun-Huang Hung, Sheng-Chun Cheng, Chia-Cheng Lan, Tian-Le Dept. of Electrical Engineering Feng Chia Univ. 100 Wenhwa Road Seatwen Taichung Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia Univ. 100 Wenhwa Road Seatwen Taichung Taiwan

ISBN: (纸本)9781510663411

An optical machine system for measuring the depth distance of an object was proposed. This system can scan a region by obtaining the relationship curve between focus distance and motor step. The depth distance was acquired by determining whether the captured objects was in focus or not by discerning the sharpness of the object’s outline, with the motor step when the object was in focus. This system has been verified its feasibility in the experiment and has the merits of a larger sensing range, lower manufacturing cost, and can be used outdoors. © 2023 SPIE · 0277-786X ·

关键词： Optical instruments

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Compact Refractive Error Measuring device 6

Compact Refractive Error Measuring Device

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6th IEEE Eurasian Conference on Educational Innovation, ECEI 2023

作者： Yeh, Feng-Ming Chiang, Chun-Yu Chang, Chao-Kai Wang, Hsuan-Fu Tien, Chuen-Lin Chen, der-Chin Department of Optometry Yuanpei University of Medical Technology Hsinchu Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Aeronautical Engineering National Formosa University Yunlin Taiwan Department of Electrical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9798350334289

In this study, a reflective aspheric optical system is used to establish an eye examination device for distance and near vision tests. The system includes a micro-display with a rotating device, an off-axis parabolic mirror, an off-axis ellipsoid mirror, a chin-fixing bracket, and vision software. The display contents of the micro-display include English C and E charts, Chinese words, graphics, and animation. The off-axis parabolic mirror and off-axis ellipsoid mirror are confocal, and the micro-display is placed at the confocal point. The micro-display is projected through an off-axis parabolic mirror for myopia's distance vision testing, and an off-axis elliptical mirror for myopia's near vision testing. Others, the graphics and animation, provide visual checks for young children. In addition, CCd cameras and AI recognition can be used as visual examinations for people with language impairment. In this study, twenty-five subjects with the refractive error were tested using E-chart and this device to obtain the decimal point VA value, and the trial frame and lens were used to obtain the diopter of glasses. The date of the experimental results was used as a reference value for ophthalmological examination. This system uses an off-axis parabolic mirror and an off-axis ellipsoidal mirror. Optical alignment is a challenge to solve for the system. Students participating in the study obtained good optics training. The advantages of the developed device include the convenience to carry with a multi-purpose and straightforward use. © 2023 IEEE.

关键词： Mirrors

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Integrating Visual SLAM and Smooth Speed Control for Realizing Real-Time Autonomous System

Integrating Visual SLAM and Smooth Speed Control for Realizi...

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International Conference on Computer and Automation engineering, ICCAE

作者： Mao-Jen Ko Yu-Chen Lin Chih-Hung Cheng Thanh-Tan Nguyen Department of Automatic Control Engineering Feng Chia University Taichung Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan

ISBN: (数字)9798350370058

ISBN: (纸本)9798350370164

In recent years, the rapid development of autonomous system technology has increasingly positioned it as a crucial player in modern transportation. Appropriate speed planning emerges as one of the key elements for achieving safe and efficient autonomous system operations. Speed planning not only requires adherence to road speed limits and ensuring safe distances to avoid collisions but also necessitates consideration for ensuring passenger comfort. This paper proposes a method that restricts acceleration and jerk to achieve smooth speed control, enabling autonomous system to emulate the driving style of human drivers. Utilizing visual SLAM for feature extraction and matching on images, a sparse point cloud three-dimensional map of the environment is constructed. The recorded path is tracked using the Pure Pursuit algorithm. Finally, this paper will validate the proposed approach through an embedded system deployed in a real vehicle. The integration of visual SLAM and smooth speed control technology realizes a real-time and smooth autonomous system, providing a safer autonomous system experience.

关键词： Point cloud compression Visualization Simultaneous localization and mapping Autonomous systems Velocity control Feature extraction Real-time systems

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Separation of Heart and Lung Sounds by A deep Network-Based Model

Separation of Heart and Lung Sounds by A Deep Network-Based ...

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IEEE International Conference on Knowledge Innovation and Invention (ICKII)

作者： Tung-Sheng Tsai Chun-Chieh Hsu Ching-Lung Hsieh Yi-Jui Liu Ph.D. Program of Electrical and Communications Engineering Feng Chia University Feng Chia University Chung Shan Medical University Hospital

Breath and heart sounds are the two main biological sound signals. Heart sounds are produced by the beating of the heart caused by blood flows in the heart valves and blood vessels, while lung sounds are produced by the flow of air in and out of the airways during the breathing cycle. Both signals are recorded from the chest area. However, these two signals are mostly superimposed on each other, so it is of great research interest to separate these heart sound signals (HSS) and lung sound signals (LSS). A "Looking to Listen" model developed by Google, is a joint audiovisual model for isolating a single speech signal from a mix of sounds such as other speakers and background noise. In this study, we evaluated the feasibility of separating HSS and LSS by the audio part of the "Looking to Listen" model. We collected the pure HSS (phSS) and pure LSS (PLSS) data from the public website (kaggle dataset, CoronaHack Respiratory Sound dataset). Then, heart and lung sounds (MHLS) were combined HSS and LSS with different weighting power (3:7, 5:5, and 7:3). A total of 8076 MHLSs were generated with 72% of the data in the training set, 10% in the validation set, and 18% in the test set. The cross-correlation coefficient (CC) of pure sound and mixed sound and CC of separated and pure sounds were compared to evaluate the efficacy of extraction HSS or LSS from MHLS. The results showed the mean CC was 0.4, 0.7, and 0.9 for pure HSS and MHLS with 3:7, 5:5, and 7:3, respectively; and the mean CC was 0.79, 0.87, and 0.97 for pure HSS and predicted HSS with 3:7, 5:5, and 7:3, respectively. The mean CC was 0.9, 0.7, and 0.4 for pure LSS and MHLS with 3:7, 5:5, and 7:3, respectively. The mean CC was 0.95, 0.91, and 0.81 for pure LSS and predicted LSS with 3:7, 5:5, and 7:3, respectively. The feasibility of separating HSS and LSS by the audio part of the "Looking to Listen" model was validated.

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design of Optical System of Augmented Reality Near Eye device 6

Design of Optical System of Augmented Reality Near Eye Devic...

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6th IEEE Eurasian Conference on Educational Innovation, ECEI 2023

作者： Chang, Chao-Kai Yeh, Feng-Ming Lue, Jiann-Hwa Wang, Hsuan-Fu Hsieh, Ya-Hui Chiang, Chun-Yu Chen, der-Chin Tien, Chuen-Lin Department of Optometry Yuanpei University of Medical Technology Hsinchu Taiwan Department of Optometry Taiwan University of Science and Technology Taichung Taiwan Department of Aeronautical Engineering National Formosa University Yunlin Taiwan Department of Healthcare Information and Management Ming Chuan University Taoyuan Taiwan Ph.D. Program of Electrical and Communications Engineering Feng Chia University Taichung Taiwan Department of Electrical Engineering Feng Chia University Taichung Taiwan

ISBN: (纸本)9798350334289

Augmented reality (AR) is a technology that instantly merges digital pictures with the real scene. The perspective near-eye display is a key module of AR, through which computer-generated pictures or videos can be displayed in the existing environment. The purpose of this research is to establish the system structure of an augmented reality near-eye display device and to design the off-axis two-piece reflective aspherical mirror. Because AR glasses are wearable and are worn close to the eyes, not only the optical performance of the display but also the clear vision of the user needs to be considered. In this study, an off-axis two-piece reflective aspherical mirror is used as the optical system of the AR for displaying the digital image. The micro-display is placed at the focal point of the optical system to form a digital image, and the horizontal movement of the micro-display along the optical axis is controlled by a precise displacement mechanism so that the patient with uncorrected myopia or hyperopia can see the digital picture and real scene. Because the right and left micro-displays move horizontally independently, the user can see the images on the AR device, which becomes the biggest feature of this study. © 2023 IEEE.

关键词： Augmented reality

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Analysis of Capacitive Clamp Effect on Power Charging Cords and Plug with EFT Transient Burst Injection 13

Analysis of Capacitive Clamp Effect on Power Charging Cords ...

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13th Asia-Pacific International Symposium on Electromagnetic Compatibility and Technical Exhibition, APEMC 2022

作者： Lin, Han-Nien Ho, Tzu-Hao Syu, Wan-Yu Wei, Yu-Ming Lee, Yueh-Hsun Ye, Qain-Yu Huang, Cheng-Hao Lin, Liang-Yang Ku, Yuan-Fu Lin, Jeffrey Yen-Ting Feng Chia University Department of Communications Engineering Taichung City Taiwan Feng Chia University Ph.D. Program of Electrical and Communications Engineering Taichung City Taiwan Ministry of Economic Affairs Bureau of Standards Taipei City Taiwan Electronics Testing Center Taiwan University at Albany ECE New York United States

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

This paper investigates the coupling effect on EFT Burst transient waveform injected via CdN and capacitive clamp described in IEC 61000-4-4 [1]. We first introduce the EFT Burst transient Generator model [2] previously established published with ANSYS designer, and which has later been adopted into ANSYS Electronics desktop serving for immunity effect and protection measure analysis. Even though the EFT generator model has been validated with measured waveform and met pulse specification listed in the Standard, the users of ANSYS Electronics desktop would further like to simulate their design for immunity performance in combination of EFT generator with capacitive injection clamp as test in EMC laboratory. Therefore we investigate the capacitive coupling effect on EFT waveform which injected onto EUT, for example EV charging cables and plugs, via CdN or clamp with the model of coupling network established by utilization of ANSYS Q3d and SIwave. The coupling model also takes into account the transmission line effectivity for accuracy convergence. This study intends to provide an effective simulation model to help electronic engineers enhancing their EMS design capability. © 2022 IEEE.

关键词： Electromagnetic compatibility

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