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Effects of topographical disturbances on flexural wave motion in a viscous fluid

Physics of Fluids 2024年第3期36卷 037103-037103页

作者： Prasad, Indra Mani Behera, Harekrushna Tsai, Chia-Cheng Hsu, Tai-Wen Department of Mathematics SRM Institute of Science and Technology Tamil Nadu Kattankulathur603203 India Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung202301 Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung202301 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung202301 Taiwan

Main causes of ground disturbances are geological events such as earthquakes, underwater gravity mass flows, volcanic eruptions, and bottom explosions. This paper investigates the effects of transitory ground disturbance on the generation of flexural waves in the presence of a thin floating elastic plate. The problem is formulated using the Stokes stream function and wave potential boundary value problems in a viscous fluid. The expression of the plate deflection is obtained as multiple infinite integrals using the Fourier and Laplace transforms, which is further solved by the steepest descent method. Three types of ground disturbances such as H 0 ( x ) = e ( − x 2 / 2 ) , H 0 ( x ) = e − | x | , and H 0 ( x ) = δ ( x ) are considered. The deflection of the floating elastic plate is investigated in connection to ground disturbances, fluid viscosity, and structural parameters such as mass per unit length of the plate and flexural rigidity. The study reveals that with higher viscosity and flexural rigidity, the amplitude of the plate deflection is reduced. Moreover, these two parameters play a great role in the reduction of plate deflection. © 2024 Author(s).

关键词： Viscous flow

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Wave power extraction by a dual OWC chambers over an undulated bottom

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Renewable Energy 2023年第1期216卷

作者： Naik, Nikita Gayathri, R. Behera, H. Tsai, Chia-Cheng Department of Mathematics SRM Institute of Science and Technology Tamil Nadu Kattankulathur603203 India Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung202301 Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung202301 Taiwan

The impacts of sloping bottom and slanted impenetrable wall on dual oscillating water columns (OWCs) with a slanted front wall are examined. To tackle the physical model, a coupled eigenfunction expansion — boundary element system is employed. The concept is based on employing the anticipated amplification of scattered and reflected wave fields generated by the existence of sloping walls to enhance the absorption of wave power driven by the walls’ wave reflections. The study concludes that 100% efficiency occurs for smaller incident wave angles. It is also observed that compared with short waves, the efficiency of the device is more in the long-wave region. OWCs are observed to be more effective over the undulating bottom and sloping impermeable wall with an increased spacing between the water columns and the second OWC to the impermeable wall. Additionally, the chambers’ width and the sloping bottom angle are vital parameters for higher power extraction from the OWCs. Furthermore, the optimal values of slope bottom and wall inclination may be employed to build and implement an efficient OWC device. Moreover, the proposed model can also be used as a breakwater to protect the coastline. © 2023 Elsevier Ltd

关键词： Boundary element method

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Study on the Application of Typhoon Experience Parameter Analysis in Taiwan’s Offshore Wind Farms

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Water (Switzerland) 2023年第14期15卷 2575页

作者： Fang, Hui-Ming Hsu, Hao-Teng Wang, Hsing-Yu Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung20224 Taiwan Ship and Ocean Industries R&D Center Taipei251401 Taiwan Department of Shipping Technology National Kaohsiung University of Science and Technology Kaohsiung805301 Taiwan

Due to the rapid development of computers, researchers have made efforts since the 1990s to develop typhoon forecasting models and stochastic typhoon simulation models to assess typhoon disasters and risks. Typhoon forecasting models are primarily used to predict and track the movement of typhoons and provide warning information to the general public before landfall. Stochastic typhoon simulation models can assess extreme wind speeds and compensate for the limitations of current observations and simulation data length. Taiwan experiences approximately three to four typhoons yearly, of varying intensities and paths. Whether the marine meteorological data includes events of strong typhoon centers passing through will affect the results of frequency analysis. The development of offshore wind power in Taiwan is closely related to the unique marine meteorological conditions throughout the lifecycle stages, including wind farm site selection, feasibility studies, planning and design, construction and installation, operation and maintenance, and decommissioning. This study references relevant research and analyzes sixty-three scenarios using nine types of maximum storm wind speed radii and seven Holland-B parameters. The data from Japan Meteorological Agency Best Track Data (JMA BTD) is utilized, explicitly selecting 20 typhoon events after 2000 for wind speed simulation using a typhoon wind speed model. After validating the typhoon wind speeds with observation data from the Central Weather Bureau (CWB) in Hsinchu and the Longdong buoy, the technique of Monte Carlo simulation is utilized to generate synthetic typhoons randomly. The average of the relative absolute errors for the simulated maximum wind speeds is calculated, and through comprehensive evaluation, optimal parameter combinations ((Formula presented.), (Formula presented.)) are obtained. © 2023 by the authors.

关键词： Stochastic systems

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Application of Rogue Waves Simulation for Reef Coasts Risk Assessment

SSRN

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SSRN 2023年

作者： Tseng, I-Fan Hsu, Chih-Hung Department of Marine Environment and Engineering National Sun Yat-sen University Kaohsiung80424 Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung202301 Taiwan

Coastal regions are crucial for human settlements, and comprehending the risks they pose is imperative. This study introduces a comprehensive risk assessment framework employing numerical simulations of rogue waves for reef coasts in Taiwan. This methodology integrates bathymetric data, wave conditions, and the FLOW-3D computational fluid dynamics model to replicate wave patterns and their evolution in nearshore areas. Such integration permits the assessment of rogue wave occurrence probability and associated hazard level ratings for designated reef coast sites in Taiwan. The study analyzed 30 reef coast locations, focusing specifically on the likelihood and hazard scores of rogue waves. An evaluation of historical wave data and simulation results revealed that zones with elevated rogue wave occurrence probabilities align with previous incident patterns. This framework offers invaluable insights into latent risks, thereby enhancing coastal safety and benefiting engineering strategies. © 2023, The Authors. All rights reserved.

关键词： Numerical models

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Application of Unmanned Aerial VehicleeBased Infrared Images in Determining Characteristics of Sea Surface Temperature Distribution

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Journal of Marine Science and technology (Taiwan) 2023年第1期31卷 13-25页

作者： Wang, Hsing-Yu Fang, Hui-Ming Chiang, Yun-Chih Department of Shipping Technology College of Maritime National Kaohsiung University of Science and Technology Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Taiwan Center for General Education Tzu Chi University Taiwan

This study investigated the temperature field of a body of water by using rotary-wing unmanned aerial vehicles (DJI Mavic 2 Enterprise Dual) comprising visible light and infrared cameras to determine sea temperature distribution. With a flight height of 150 metres, image overlap of 80%, and image resolution of 4.75 cm/pixel, the proposed method was more effective than the conventional portable conductivityetemperatureedepth device in rapidly measuring sea surface temperature and determining sea temperature distribution. The discharged heated water of the Hoping Power Plant traveled 100e330 metres from the wastewater outfall and then gradually diffused in the range of 100e490 metres before reaching a similar temperature to the background sea temperature. The diffusion of the thermal plume was mainly affected by regional marine meteorological conditions. © 2023 National Taiwan ocean University.

关键词： Unmanned aerial vehicles (UAV)

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Mental Status Identification for Infertile Patients Using Artificial Intelligence Models 14th

Mental Status Identification for Infertile Patients Using Ar...

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14th International Conference on Frontier Computing, FC 2024

作者： Hsu, Hao-Siang Wang, Jong-Yi Chiou, Hai-Chi Wu, Fu-Hsing Lin, Chuen-Horng Chan, Yung‑Kuan Department of Computer Science and Information Engineering National Taichung University of Science and Technology Taichung404336 Taiwan Department of Health Services Administration China Medical University Taichung406040 Taiwan Bachelor Degree Program of Artificial Intelligence National Taichung University of Science and Technology Taichung404336 Taiwan Department of Management Information Systems National Chung-Hsing University Taichung402202 Taiwan

ISBN: (纸本)9789819623945

Infertile patients may be a high-risk group of mental disorder. The precise identification of the mental status of infertile patients can provide decision support to healthcare professionals and may be helpful in providing preventive measures accordingly. Rare studies focused on the mental status identification using artificial intelligence (AI) models for infertile people. This study aimed to precisely identify the mental status (anxiety and depression) of infertile patients using three AI models, the XGBoost, decision tree, and stacking models. The dataset, retrieved from a structured questionnaire survey in 2011, which included 400 infertility outpatients seeking reproductive treatments at three teaching hospitals in Taiwan was adopted for training and testing AI models. Aforementioned AI models were designed and reached identification performances of accuracy, precision, recall and area under ROC curve (AUC) equaling 0.75–0.82, 0.70–0.80, 0.64–0.72, and 0.64–0.72, respectively. The XGBoost model (accuracy = 0.82, precision = 0.80, recall = 0.72, and AUC = 0.72) outperformed or equaled the decision tree and stacking models in terms of accuracy, precision, recall, and AUC values. Designed AI models for mental status identification can be integrated into the clinical decision support system (CDSS) to provide the anxiety and depression group automatically. Accordingly, the worsening of infertility-related anxiety and depression can be prevented. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： artificial intelligence infertile patients Mental status identification stacking model XGBoost

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An Improved One-Line Evolution Formulation for the Dynamic Shoreline Planforms of Embayed Beaches

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Water (Switzerland) 2024年第5期16卷 774页

作者： Tao, Hung-Cheng Hsu, Tai-Wen Fan, Chia-Ming Doctoral Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung20224 Taiwan Centre of Excellence for Ocean Engineering National Taiwan Ocean University Keelung20224 Taiwan Department of Harbor and River Engineering National Taiwan Ocean University Keelung20224 Taiwan

In this paper, an improved one-line evolution formulation is proposed and derived for the dynamic shoreline planforms of embayed beaches. Although embayed sandy beaches can perform several functions, serving as leisure spots and areas of coastal protection, shoreline advances and retreats occur continuously as a result of many natural forces, such as winds, waves, currents, tides, etc. The one-line evolution formulation for dynamic shoreline planforms based on the polar coordinate can be adopted to simulate high-planform-curvature shorelines and achieve better stability and simplicity in comparison with other description coordinates. While the polar coordinate and rectangular control volume are adopted to derive the one-line evolution formulation for dynamic shoreline planforms, the difference between the radial direction of the polar coordinate and the normal direction of the shoreline segment may result in inaccurate predictions of shoreline movements. In this study, a correction coefficient, which can adjust the influence of these two misaligned directions, is derived and included in the one-line evolution formulation, which is based on the polar coordinate. Thus, by considering the correction coefficient, an improved one-line evolution formulation for dynamic shoreline planforms of crenulate-shaped bays is proposed in this paper. Some numerical examples are provided to verify the merits of the proposed improved one-line evolution formulation. Moreover, the proposed numerical approach is applied to simulate the dynamic movements of the shoreline in Taitung—the southeastern part of Taiwan—and the effectiveness of the proposed formulation in solving realistic engineering applications is evidently verified. © 2024 by the authors.

关键词： Beaches

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Analysis of Wind Wave Characteristics of Offshore Wind Farm-Case Study in Miaoli Sea Area

Analysis of Wind Wave Characteristics of Offshore Wind Farm-...

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International Conference on Imaging, Signal Processing and Communication (ICISPC)

作者： Wang Hsing-Yu Fang Hui-Ming Chiang Yun-Chih Department of Shipping Technology National Kaohsiung University of Science and Technology Kaohsiung Taiwan Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung Taiwan Center for General Education Tzu Chi University Hualien Taiwan

Taiwan’s outer sea of Miaoli has a met mast. In order to meet the national energy policy, many offshore wind turbines will be built in the future. However, due to the unique geographical conditions in Taiwan, the northeast monsoon is strong in winter, and typhoons in summer. Special meteorological conditions will affect the hydrodynamic conditions of the sea area, further affecting the scouring conditions of offshore wind turbine foundations. To calculate the foundation scouring conditions, it is necessary to understand the local hydrodynamic conditions. This study used the 2016–2019 wave observation data of the met mast for statistical analysis. The analysis results show that the wind and wave height data in the Miaoli area are highly correlated. The direction of the significant wind speed is mainly in NE~NNE, and the considerable wave height is obtained under the same conditions. The joint probability distribution is used to describe the composition of the wave fully. By using a fixed interval, the contours show that most of the measured component waves are: the wave height is 0.5~1.0 m, and the period is 4~5 sec.

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Comments on a Blockchain-Enabled Privacy-Preserving Scheme for Demand-Response Management in Smart Grid Environments

Comments on a Blockchain-Enabled Privacy-Preserving Scheme f...

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International Conference on Applied System Innovation (ICASI)

作者： Ya-Fen Chang Jia-Yen Wu Wei-Liang Tai Department of Computer Science and Information Engineering National Taichung University of Science and Technology Taichung Taiwan Bachelor Degree Program of Artificial Intelligence National Taichung University of Science and Technology Taichung Taiwan

ISBN: (数字)9798350394924

ISBN: (纸本)9798350394931

To protect privacy, Park et al. proposed a blockchain-enabled privacy-preserving scheme (BPPS) to achieve demand response in the smart grid environment. Park et al. claimed that their scheme could resist various attacks and ensure both of privacy and data integrity. However, with thorough analysis of their scheme, we find that it suffers from three flaws.

关键词： Privacy Technological innovation Resists Load management Denial-of-service attack Demand response Smart meters

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Corrigendum to “Boussinesq modeling of typhoon-induced infragravity oscillations in Hualien Harbor, eastern Taiwan: Influence of the adjacent coast” [Coast. Eng. 201 (2025) 104789]

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Coastal engineering 2025年

作者： Shih-Feng Su Gangfeng Ma Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung Taiwan

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