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Dynamic weight-based connectivity recovery in wireless sensor and actor networks

Journal of Supercomputing 2024年第1期80卷 734-760页

作者： Chiang, Mao-Lun Hsieh, Hui-Ching Lin, Tzu-Ling Chang, Tsui-Ping Chen, Hong-Wei Bachelor Degree Program of Artificial Intelligence National Taichung University of Science and Technology Taichung City Taiwan Department of New Media Communication Hsing Wu University New Taipei City Taiwan Department of Business Management National Taichung University of Science and Technology Taichung City Taiwan Department of Computer Science and Information Engineering National Taichung University of Science and Technology Taichung City Taiwan Department of Information and Communication Engineering Chaoyang University of Technology Taichung City Taiwan

Wireless sensors and actor networks (WSANs) have been widely used in various fields, from basic data collection to precise real-time control and monitoring, including battlefield monitoring, rescue, and exploration. The actor nodes in a WSAN play a key role in processing and transmitting data, and because of the harsh environmental conditions encountered, network node failures are prone to occur. The failure of an actor causes a loss of connectivity with its neighbor nodes, resulting in network splits and failure to deliver messages between nodes. Therefore, determining how to quickly and autonomously recover network connectivity while minimizing the moving distance of backup nodes and the number of relocated nodes is crucial. In this paper, we propose a dynamic weight-based connectivity recovery (DWCR) method to minimize the total moving distance of actor nodes, the number of relocated nodes, the total messages sent, and the coverage loss rate. The proposed DWCR method involves selecting a backup node for each critical node by dynamically adjusting the weight. If a critical node fails, the backup node starts to move to restore the connectivity of the failed node. The simulation results indicate that the proposed DWCR method outperforms the recovery through inward motion (RIM) method and other methods in terms of minimizing the total moving distance, the number of relocated nodes, and the total messages sent. However, because the RIM algorithm requires the relocation of more nodes during the network process, the DWCR algorithm is slightly inferior to the RIM algorithm in terms of coverage loss rate. Nevertheless, the DWCR algorithm still outperforms the distributed actor recovery algorithm and the distributed autonomous connectivity restoration method based on finite state machine algorithm. © 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

关键词： Recovery

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

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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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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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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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Reliable Data Transmission through Private CBRS Networks

arXiv

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arXiv 2023年

作者： Kuo, Hsun-Yu Liu, Szu-Yu Huang, Chin-Ya Chen, Yu-Chi Xie, Meng-Hua The Bachelor Degree Program of Applied Science and Technology National Taiwan University of Science and Technology Taiwan The Dept. of Electronic and Computer Engineering National Taiwan University of Science and Technology Taiwan

We consider the use of a domain proxy assisted private citizen broadband radio service (CBRS) network and propose a Maximum Transmission Continuity (MTC) scheme to transmit Internet of Things (IoT) data reliably. MTC dynamically allocates available CBRS channels to sustain the continuity of data transmission without violating the channel access requirements. MTC allocates the granted CBRS channels according to the priority of each user, the instant channel access status, interference among users, and the fairness. The simulation results demonstrate the improvement in managing reliable IoT data transmission in the private CBRS network. Copyright © 2023, The Authors. All rights reserved.

关键词： Internet of things

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Wave attenuation by a submerged circular porous membrane

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Journal of ocean engineering and Science 2022年

作者： Gayathri, R. Khan, Mohamin B M Behera, Harekrushna Tsai, Chia-Cheng Department of Mathematics SRM Institute of Science and Technology Chengalpattu District Kattankulathur Tamil Nadu 603203 India Bachelor Degree Program in Ocean Engineering and Technology National Taiwan Ocean University Keelung 202301 Taiwan Center of Excellence for Ocean Engineering National Taiwan Ocean University Keelung 202301 Taiwan

Wave action over a submerged circular flexible porous membrane is investigated and the impact of porosity in dampening the far-field wave amplitude is examined in a scattering of incoming waves. The unknown potential for the free surface and the membrane-covered regions are obtained by coupling the respective boundary conditions and Darcy's law for permeable structure. The associated boundary value problem is solved using the method of expansions of the eigenfunctions as Fourier-Bessel series. To understand the efficiency of the present study, wave force excitation on the circular membrane, far-field scattering wave amplitude, energy dissipation, and flow distribution are computed and examined. The study shows that on the leeward side of the membrane the wave amplitude reduces drastically. In addition, the submergence depth has a significant impact on wave energy dissipation. This model will be beneficial in developing the mechanism to minimize wave force on coastal structures for a variety of marine operations. In addition, this structure has minimal environmental effects on different coastline processes and can therefore be used in a variety of coastal/ocean applications. © 2022

关键词： Circular membrane Eigenfunction expansion method Flow distribution Plane wave integration Porous-effect parameter

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EXTERNAL MEASUREMENT OF INTERNAL PRESSURE

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NAVAL ENGINEERS JOURNAL 1969年第6期81卷 117-&页

作者： PETRISKO, EM Mr. Edwin M. Petrisko is Project Engineer in the office of the Ocean Technology Program Coordinator of the Naval Ship Research and Development Laboratory Annapolis Maryland. He graduated from the University of Pittsburgh in 1964 with a Bachelor of Science degree in Mechanical Engineering.

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Recent innovations in material research

Recent innovations in material research

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作者： Cai, W.J. Chen, D. Hu, H. Huang, X.P. Khotsyanovskii, A.O. Li, X.S. Silva, F.J.G. Yao, S.H. Zheng, H.N. Department of Chemical Materials and Biomolecular Engineering University of Connecticut United States School of Engineering and Applied Science Harvard University United States Department of Mechanical Automotive and Materials Engineering University of Windsor Canada Department of Mechanical Engineering Massachusetts Institute of Technology United States Pisarenko Institute of Problems of Strength National Academy of Sciences of Ukraine Ukraine Mechanical Engineering Department ISEP School of Engineering Polytechnic of Porto Portugal Bachelor Degree Program in Technology Management Chang Jung Christian University Taiwan

The new trends and developments in the novel functional materials and material research innovations presented at the 3rd Global Conference on Materials Science and engineering (CMSE2014), which was held on 20-23 October 2014 in Shanghai, China, is discussed. R. Toyoda, M. Tawata, M. Hashimoto, and Y. Matsumura presented 'Internal stress control of transition-metal thin films', where the effects of ion bombardment parameter Pi on the internal stress of thin films were evaluated. X.G. Wang, Z.L. Chen, and X.Y. Wang presented their study 'Measurement of the interface characteristic based on ultrasonic longitudinal wave', which provided a lucrative alternative to conventional ultrasonic techniques, since it allows one to avoid the mutual superposition of reflected waves at the same thin coating interface. P. Wang and C.Y. Zhao presented their 'Study on reducing railway noise by porous concrete sound-absorbing panel', which is crucial for noise reduction near the railway lines. In the paper entitled 'Numerical study on the heat preservation of the ladle used for twin-roll strip casting', J.H. Dong, M. Chen and N. Wang developed a 3D mathematical model, in order to analyze the heat transfer and temperature drop on the ladle using the finite volume method.

关键词： Finite volume method

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Comments on a Computation-Transferable Authenticated Key Agreement Protocol for Smart Healthcare

Comments on a Computation-Transferable Authenticated Key Agr...

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International Conference on Applied System Innovation (ICASI)

作者： Ya-Fen Chang Chung-Yi Tsai 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

Recently, Wang et al. proposed a computationally transferable authenticated key agreement protocol for smart healthcare by adopting the certificateless public-key cryptography. They claimed that their protocol could ensure privacy, resist various attacks, and possess superior properties. After analyzing their protocol, we find that it suffers from some flaws. Firstly, user privacy is not ensured as claimed. Secondly, some statements are inaccurate or missing. Thirdly, it cannot resist DoS attack. In this paper, the details of how these flaws threaten Wang et al.’s protocol are shown.

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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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