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SSRN 2024年

作者： Sun, Ying-Sui Chu, Peng-Wei Cheng, An-Yu You, Jhu-Lin Chang, Tsung-Ming Jian, Shun-Yi Chi, Chun-Shang Liu, Yu-Cheng Chang, Chin-Jou School of Dental Technology College of Oral Medicine Taipei Medical University Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu300044 Taiwan Department of Chemical & Materials Engineering Chung Cheng Institute of Technology National Defense University Taoyuan335 Taiwan System Engineering and Technology Program National Chiao Tung University Hsinchu300 Taiwan Department of Material Engineering Ming Chi University of Technology New Taipei City24301 Taiwan Center for Plasma and Thin Film Technology Ming Chi University of Technology New Taipei243303 Taiwan Combination Medical Device Technology Division Medical Devices R&D Service Department Metal Industries Research & Development Centre Kaohsiung802 Taiwan

Mg and its alloys are characterized by favorable biocompatibility and nontoxicity, and these properties have stimulated considerable research interest in their application as degradable biomaterials for medical implants. However, the clinical application of these materials is restricted by their rapid degradation. Therefore, this study designed a surface modification method for Mg and Mg alloys to enable them to satisfy clinical requirements. A two-step conversion coating method was applied to pure Mg. Pure Mg samples were first coated with calcium phosphate (Ca–P), following which they were coated with titanium fluoride (Ti–F), resulting in the production of Mg samples coated with a bioactive Ca–P/Ti–F composite. The composition of the coated samples was investigated through energy-dispersive X-ray spectroscopy with transmission electron microscopy, and their morphology was characterized through scanning electron microscopy. Moreover, hydrogen evolution measurements in simulated body fluid (SBF), electrochemical impedance spectroscopy, and polarization curves were employed to evaluate the samples’ corrosion resistance. The prepared composite conversion coatings had an average thickness of approximately 350 nm, and their corroded area was less than 5% of their total area following their immersion in SBF for 72 h. Thus, the prepared Ca–P/Ti–F composite conversion coatings effectively inhibited Mg corrosion in SBF. Moreover, the attachment and differentiation of MG-63 cells on the prepared coatings were observed. © 2024, The Authors. All rights reserved.

关键词： Energy dispersive spectroscopy

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The Impact of Greening Strategies on Temperature Reduction at Bus Stop Utilizing Computational Fluid Dynamics (Cfd) Analysis

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SSRN 2024年

作者： Kim, Na Youn Kim, Eun Sub Yun, Seokhwan Lee, Dong Kun Department of Landscape Architecture and Rural System Engineering Seoul National University Seoul08826 Korea Republic of Interdisciplinary Program in Landscape Architecture Seoul National University Seoul08826 Korea Republic of Integrated Major in Smart City Global Convergence Program Seoul National University Seoul08826 Korea Republic of Specialized Graduate School of Intelligent Eco-Science 4 Dept. of Landscape Architecture Seoul National University Seoul08826 Korea Republic of

This study analyzed the effectiveness of a vegetation strategy for mitigating heat within a bus stop shelter by implementing vegetation wind permeability and transpiration cooling processes using a computational fluid dynamics (CFD) simulation. In scenario 1, a pot-type vertical greening system (VGS) without wind permeability had no significant effect on temperature reduction in the bus stop shelter. In contrast, scenario 2, with a mesh VGS allowing wind permeability, resulted in an average temperature reduction of 0.16°C within the interior area of the bus stop shelter, accompanied by shelter improved ventilation. Scenario 3, which entailed the removal of the shelter and the planting of trees, resulted in the least reduction in wind speed and an average temperature reduction of 0.14°C in the bus waiting area. Scenario 2 demonstrated the most effective temperature reduction for interior and surrounding area of the bus stop. Considering the normal effective temperature (NET), Scenario 3 provided the lowest sensation temperature. This indicates that the improved ventilation in Scenario 3 had a substantial impact on NET. Considering the effects of the vegetation strategies proposed in this study, it is essential to select suitable strategies for heat mitigation in bus-stop shelters based on regional and spatial considerations. © 2024, The Authors. All rights reserved.

关键词： Computational fluid dynamics

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Effect of surface curvature on drop impact forces on curved superhydrophobic surfaces

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International Journal of Multiphase Flow 2025年 191卷

作者： Akash Ranjan Pati Ikroh Yoon Young-su Ko Seungwon Shin Choongyeop Lee Department of Mechanical Engineering (Integrated Engineering Program) Kyung Hee University Yongin-si 17104 Republic of Korea Department of Mechanical System Engineering Korea Military Academy Seoul 01805 Republic of Korea Department of Mechanical and System Design Engineering Hongik University Seoul 04066 Republic of Korea

The dynamic impact of liquid drops on rigid surfaces can be found in numerous practical applications, including spray cooling, inkjet printing, spray coating, airplane wings, and steam turbine blade. Notably, the post-impact dynamics can affect the robustness and durability of the impacted surfaces by causing erosion or degradation. This study experimentally and numerically investigates the impact forces on cylindrically curved superhydrophobic (C-SHPo) surfaces across a wide range of Weber number (We = 50 − 175) and cylinder diameter (3 − 20 mm). The results show two distinct peaks in the impact force: the one originating from the inertial impact of the drop and the other from the pressure rise during the retraction motion. Initial peak force increases with We owing to higher inertial effect, whereas the second peak force shows unexpected behavior on small C-SHPo surfaces: the second peak force increases with We first then it decreases again if We is greater than the certain Weber numbers. Based on the three-dimensional direct numerical simulation, it is found that the reduced contact area resulted from the detached and fingered parts of drop plays a major role in the reduced second peak force on small C-SHPo surfaces.

关键词： Asymmetric spreading Curved superhydrophobic surface Direct numerical simulation Impact force Retraction dynamics

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Surface Second Harmonic Generation from Topological Dirac Semimetal PdTe2

arXiv

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arXiv 2023年

作者： Faizanuddin, Syed Mohammed Chien, Ching-Hang Chan, Yao-Jui Kuo, Chia-Nung Lue, Chin Shuan Wen, Yu-Chieh Institute of Physics Academia Sinica Taipei11529 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu300044 Taiwan Department of Physics National Cheng Kung University Tainan701401 Taiwan Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan

Three-dimensional topological semimetals were shown to host anomalously strong optical nonlinearity, but yet whether such enhancement can occur at their surfaces via topological boundary states remains an open question. Here we tackle this question by examining polarization-dependent rotational-anisotropy optical second harmonic generation (SHG) from transition metal dichalcogenide Dirac semimetal PdTe2. We find its reflected SHG to follow C3v surface symmetry with a time-varying intensity dictated by oxidation kinetics of the material after its surface cleavage, confirming the surface-derived origin of SHG. The complex surface nonlinear optical susceptibility tensor is fully characterized by heterodyne interferometry, unveiling a hidden giant out-of-plane response χzzz (2) (> 10.6 nm2/V or, equivalently, an effective bulk nonlinear susceptibility > 10.3 nm/V). Our results highlight the topological surfaces/interfaces as a new route toward nonlinear optical applications with released symmetry constraints, and demonstrate SHG as a viable means for in situ probing of surface chemistry of topological systems. Copyright © 2023, The Authors. All rights reserved.

关键词： Nonlinear optics

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Studying sprouting angiogenesis under combination of oxygen gradients and co-culture of fibroblasts using microfluidic cell culture model

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Materials Today Bio 2023年 21卷 100703页

作者： Hsu, Heng-Hua Ko, Ping-Liang Peng, Chien-Chung Cheng, Ya-Jen Wu, Hsiao-Mei Tung, Yi-Chung Research Center of Applied Sciences Academia Sinica Taipei Taiwan Department of Engineering and System Science National Tsing Hua University Hsinchu Taiwan Department of Mechanical Engineering National Taiwan University Taipei Taiwan Institute of Molecular Biology Academia Sinica Taipei Taiwan Neuroscience Program of Academia Sinica Academia Sinica Taipei Taiwan Department of Biomechatronics Engineering National Taiwan University Taipei Taiwan College of Engineering Chang Gung University Taoyuan Taiwan

Sprouting angiogenesis is an essential process for expanding vascular systems under various physiological and pathological conditions. In this paper, a microfluidic device capable of integrating a hydrogel matrix for cell culture and generating stable oxygen gradients is developed to study the sprouting angiogenesis of endothelial cells under combinations of oxygen gradients and co-culture of fibroblast cells. The endothelial cells can be cultured as a monolayer endothelium inside the device to mimic an existing blood vessel, and the hydrogel without or with fibroblast cells cultured in it provides a matrix next to the formed endothelium for three-dimensional sprouting of the endothelial cells. Oxygen gradients can be stably established inside the device for cell culture using the spatially-confined chemical reaction method. Using the device, the sprouting angiogenesis under combinations of oxygen gradients and co-culture of fibroblast cells is systematically studied. The results show that the oxygen gradient and the co-culture of fibroblast cells in the hydrogel can promote sprouting of the endothelial cells into the hydrogel matrix by altering cytokines in the culture medium and the physical properties of the hydrogel. The developed device provides a powerful in vitro model to investigate sprouting angiogenesis under various in vivo-like microenvironments. © 2023 The Authors

关键词： Endothelial cells

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Statistical Analysis of Intrinsic High-Frequency Characteristic Fluctuation of Emerging Silicon Gate-All-Around Nanosheet (NS) MOSFETs at Sub-3-nm Nodes

Statistical Analysis of Intrinsic High-Frequency Characteris...

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IEEE Electron Devices Technology and Manufacturing Conference (EDTM)

作者： Sekhar Reddy Kola Yiming Li Min-Hui Chuang Kazuhiko Endo Seiji Samukawa Parallel and Scientific Computing Laboratory Electrical Engineering and Computer Science International Graduate Program Institute of Communications Engineering Department of Electronics and Electrical Engineering Institute of Biomedical Engineering Center for mm Wave Smart Radar System and Technologies National Yang Ming Chiao Tung University Hsinchu Taiwan Institute of Fluid Science Tohoku University 2-1-1 Katahira Aoba-ku Sendai Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan

In recent years, the GAA NS Si MOSFET has been explored as a leading technology. However, the intrinsic parameters of GAA NS Si MOSFETs are affected to varying degrees by various fluctuation sources, Statistically independent and identically distributed $(iid)$ assumptions on the aforementioned random variables overestimate the variability of high-frequency characteristics, compared with considering all fluctuation factors simultaneously. Notably, the random nanosized metal grains dominates the variations of voltage gain, cut-off frequency, and 3dB frequency because the random work functions strongly alter the channel surface potential.

关键词： MOSFET Fluctuations Statistical analysis Gallium arsenide Cutoff frequency Metals Logic gates

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An Embedded Real-Time Monocular SLAM system Utilizing a Dynamically Reconfigurable Processor 5th

An Embedded Real-Time Monocular SLAM System Utilizing a Dyna...

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5th Asian Conference on Pattern Recognition,ACPR 2019

作者： Kawashima, Koki Katsura, Koyo System Design Program Graduate School Engineering Kogakuin University 1-24-2 Nishi-Shinjuku Shinjuku-ku Tokyo163-8677 Japan

ISBN: (纸本)9789811536502

In this paper, we propose an Embedded Real-time Monocular SLAM (Simultaneous Localization and Mapping) system for an autonomous indoor mobile robot. Autonomous mobile robots must be able to estimate and maintain the pose of the robot and the map of the environment at the same time. SLAM performs those tasks using one or more external sensors (e.g., LiDAR, Camera, and Inertial Measurement Unit). The previous SLAM system had problems with a sensor size, high power consumption, and high cost. Thus, it is hard to implement on a small indoor robot. We propose an Embedded (small size, low power consumption, and low cost) Real-time Monocular SLAM system which combines an ORB feature extraction-based SLAM (ORB-SLAM), a monocular camera, and a dynamically reconfigurable processor (DRP). This system realizes real-time (30 fps over) and low-power (less than 2 W) SLAM utilizing the hardware accelerating function of DRP. In the future, we will examine the speed-up of all processing and build it into a device. © 2020, Springer Nature Singapore Pte Ltd.

关键词： Field programmable gate arrays (FPGA)

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Semantic SLAM-based Autonomous Tributary Navigation system Using 3D LiDAR Point Cloud for UAV

Semantic SLAM-based Autonomous Tributary Navigation System U...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Jeonghyeon Pak Hyoung Il Son Department of Convergence Biosystems Engineering Chonnam National University 77 Yongbong-ro Gwangju Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Yongbong-ro 77 Gwangju Republic of Korea

Remote sensing methodologies are useful for managing natural systems. Among them, we focused on a methodology for collecting data by attaching three-dimensional (3D) light detection and ranging (LiDAR) sensors to unmanned aerial vehicles (UAVs) that can perform detection over a wide area with high mobility. In this study, we propose a semantic simultaneous localization and mapping (SLAM)-based autonomous driving system for tributary mapping by using a UAV equipped with a 3D LiDAR. As a natural system, tributaries are not studied extensively for diagnosing polluted watersheds and managing water quality. Therefore, it is necessary to develop a robust autonomous driving system for mapping tributary environments.

关键词： Point cloud compression Laser radar Three-dimensional displays Simultaneous localization and mapping Navigation Semantics Water quality

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A Study on Giant Magnetostrictive Actuator for Interior Sound Control system of the Ultra-Compact Mobility: Fundamental Consideration on Formation of the Giant Magnetostrictive Phases Depending on Heat Treatment Condition

A Study on Giant Magnetostrictive Actuator for Interior Soun...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Taro Kato Ryusei Naganuma Koki Bando Kentaro Sawada Wu Wenbao Ikkei Kobayashi Jumpei Kuroda Daigo Uchino Kazuki Ogawa Keigo Ikeda Ayato Endo Hideaki Kato Takayoshi Narita Mitusaki Furui Department of Mechanical Engineering Tokyo University of Technology Hachioji-shi Tokyo Japan Sustainable Engineering Program Graduate School of Engineering Tokyo University of Technology Hachioji-shi Tokyo Japan Course of Mechanical Engineering Tokai University Hiratsuka-shi Kanagawa Japan Course of Science and Technology Tokai University Hiratsuka-shi Kanagawa Japan Department of Mechanical Engineering National Institute of Technology (KOSEN) Numazu College Numazu-shi Shizuoka Japan Department of Electronic Robotics Aichi University of Technology Gamagori-shi Aichi Japan Department of Mechanical Engineering Hokkaido University of Science Sapporo Hokkaido Japan Department of Electrical Engineering Fukuoka Institute of Technology Fukuoka-shi Fukuoka Japan Department of Mechanical System Engineering Tokai University Hiratsuka-shi Kanagawa Japan

ISBN: (数字)9784886864406

ISBN: (纸本)9798350379105

An active noise control system using giant magnetostrictive actuator has been proposed as a countermeasure for interior noise of the ultra-compact mobilities, which is a new transportation tools. In this paper, as basic research toward the development of the proposed giant magnetostrictive actuator for active noise control, we conduct experiments on the material properties when terbium, dysprosium, and iron powder, which make up the giant magnetostrictive material, are mixed and the heat treatment conditions are changed. In this study, the heat treatment temperature was varied from $800^{\circ}\mathrm{C}$ to $1100^{\circ}\mathrm{C}$ in $100^{\circ}\mathrm{C}$ incrementsbased on the equilibrium state temperature of each material, and the heat treatment time was set in 30-minute increments from 1 hour to 3 hours. As a result, TbFe2 was confirmed after heat treatment at an electric furnace temperature of $1000^{\circ}\mathrm{C}$ for 3 hours, although its strength was insufficient.

关键词： Actuators Heat treatment Powders Temperature Magnetostriction Noise Terbium Iron Resistance heating Material properties

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A Multi-Antenna-based Active Tracking system for Localization of Invasive Hornet Vespa velutina

A Multi-Antenna-based Active Tracking System for Localizatio...

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International Conference on Control, Automation and systems ( ICCAS)

作者： Bosung Kim Jeonghyeon Pak Chanyoung Ju Hyoung Il Son Department of Convergence Biosystems Engineering Chonnam National University Yongbong-ro 77 Gwangju Republic of Korea Interdisciplinary Program in IT-Bio Convergence System Chonnam National University Yongbong-ro 77 Gwangju Republic of Korea

Herein, we design three experiments to prove the traceability of a multi-antenna-based active tracking system by using an unmanned aerial vehicle (UAV) in variable environments and actual Vespa velutina. In the first experiment, the movement of Vespa velutina with an attached sensor is measured, and it is checked whether there is a difference between the measurements obtained with and without the attached sensor. In the second experiment, we track a small drone instead of a Vespa velutina, which cannot provide ground truth data, and compare and analyze the path of the small drone with the tracking path of the UAV. In the third experiment, we track an actual Vespa velutina in various environments, in addition to measuring and evaluating the distance between the UAV and the target at the end of tracking, the localization result, and the tracking path. The experimental results will help to prove that transmitter attachment does not affect the target and traceability of the multi-antenna-based active tracking system when it is attached to real Vespa velutina.

关键词： Location awareness Target tracking Automation Transmitters Autonomous aerial vehicles Control systems Drones

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