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Performance analysis of heterogeneous database management system (DBMS) synchronization using message digest 5

AIP Conference Proceedings 2020年第1期2291卷

作者： Ayu Helinda Zuhar Musliyana Desita Ria Yusian TB Mahendar Dwipayana Julinawati Suanda Atikah Nor Johari 1Department of Engineering Informatics Faculty of Computer Science Ubudiyah Indonesia University Acheh Indonesia 2Department of Information System Faculty of Computer Science Ubudiyah Indonesia University Acheh Indonesia 3Center of Excellence Geopolymer & Green technology (CEGeoGTech) Universiti Malaysia Perlis Perlis Malaysia

Currently, the Database Management System (DBMS) keeps growing and is available on various platforms. The use of various types of DBMS in a system can cause problems with limitations in the synchronization process because each DBMS only provides synchronization methods for similar DMBS. Previous research has examined heterogeneous database synchronization algorithms on mobile devices using the Message Digest 5 (MD5) method. The process of synchronization with this method is done by comparing the hash values of each record data in the source table with the data hash values in the destination table. If a different hash value is obtained, the synchronization process is based on the type of transaction that has been determined. Based on the principle of work, this algorithm requires a long synchronization time for large-scale databases because it has to check the hash values of each data record. This study examined the performance analysis of the DBMS synchronization method using MD5. The testing was performed by observing the parameters of execution time of synchronization ptocess for the MySQL DBMS and PostgreSQL types. The results showed that the execution time of the MD5 synchronization process was proportional to the number of data records that need to be synchronized. This is because the hashing process that must be done on every data record and synchronization mechanism requires all data to be sent to check and compare the hash values of each data record in the destination synchronization database even though the data has not changed.

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A new battery management system for self-powered smart shoes

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AIP Conference Proceedings 2020年第1期2228卷

作者： Muladi Adim Firmansah Aripriharta Ilham Ari Elbaith Zaeni Anik Nur Handayani I. Made Wirawan Gwo Jiun Horng 1Department of Electrical Engineering Faculty of Engineering Universitas Negeri Malang Indonesia 2Centre of Advanced Materials for Renewable Energy Indonesia 3Graduate School Faculty of Engineering Universitas Negeri Malang Indonesia 4Department of Computer Science and Information Engineering Southern Taiwan University of Science and Technology Tainan City Taiwan

This paper presents a battery management system on a self-powered smart shoes application. As a mobile device, smart shoes have limited battery reserves and are separated from installed energy sources. The use of batteries must be as save as possible so that the device can still function while in use. Smart shoes can sense heart rate and oxygen levels in blood. Both collected data is encapsulated in a single frame prior to sending it to the database server through wireless sensor network. We developed an energy-saving method to extend battery life through duty cycle. The proposed method used sleep feature, data reduction, wireless transceiver optimization, and fixed network authentication configuration. The sleep feature allows the device active during data acquisition and delivery, the rest it will be going to sleep. The data is reduced to minimize power transmission. Testing energy consumption on devices with proposed battery management is carried out on wireless network ecosystem that uses static addressing. The results are compared with energy consumption from devices with conventional battery management. The results show that the proposed battery management system can reduce energy consumption up to 4.85%. Overall the proposed method has better performance than the conventional method.

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Decentralized Pose control of Modular Reconfigurable Robots Operating in Liquid Environments

Decentralized Pose Control of Modular Reconfigurable Robots ...

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2019 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)

作者： João V. Amorim Marques Anil Özdemir Matthew J. Doyle Daniela Rus Roderich Groß Department of Automatic Control and Systems Engineering The University of Sheffield Mappin St Sheffield S1 3JD UK Computer Science and Artificial Intelligence Lab Massachusetts Institute of Technology 32 Vassar St Cambridge MA USA

Modular reconfigurable robots are touted for their flexibility, as their bodies can assume a wide range of shapes. A particular challenge is to make them move efficiently in 3D without compromising the scalability of the system. This paper proposes decentralized and fully reactive controllers for pose control of 3D modular reconfigurable robots. The robots operate in liquid environments, and move by routing fluid through themselves. Each module uses only two bits of sensory information per face. Additionally, the modules can use up to five bits of information that are exchanged via shared power lines. We prove that robots of convex shape are guaranteed to reach a goal object with a preferred orientation. Using computer simulations of Modular Hydraulic Propulsion robots, all controllers are assessed for different environments, system sizes and noise, and their performances compared against a centralized controller. Given the simplicity of the solutions, modules could be realized at scales below a millimeter-cube, where robots of high spatial resolution could perform accurate movements in 3D liquid environments.

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Design of dual band notched ultra wideband microstrip patch antenna for 5G lower bands application

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AIP Conference Proceedings 2020年第1期2306卷

作者： M. M. Hasan Mahfuz Md Rafiqul Islam Norun Abdul Malek Md. Shazzadul Islam G. M. Asadullah 1Department of Electrical and Computer Engineering International Islamic University Malaysia Jalan Gombak 53100 Selangor Malaysia. 2Department of Electrical and Computer Engineering International Islamic University Malaysia Jalan Gombak 53100 Selangor Malaysia. 3Department of Electrical and Computer Engineering International Islamic University Malaysia Jalan Gombak 53100 Selangor Malaysia. 4Department of Electrical and Computer Engineering International Islamic University Malaysia Jalan Gombak 53100 Selangor Malaysia. 5Department of Electrical and Computer Engineering International Islamic University Malaysia Jalan Gombak 53100 Selangor Malaysia.

Fifth-generation (5G) forums in ASEAN countries have proposed lower frequency bands for 5G applications at 4.5 – 5.5 GHz and also the fixed-satellite service (FSS) has realised 3.3 – 3.8 GHz in C-band for 5G cellular communication recently, which leads the necessity of proposing antennas for the particular bands. In this paper, a compact ultra-wideband (UWB) patch antenna with dual band-notched characteristics has been proposed for lower 5G bands. The UWB has been achieved with a partial ground plane and further two notched 5G bands have been obtained with a rectangular slot on the patch and by connecting an arc shape open loop (ASOL) on top of the patch. The antenna has achieved a wide – 10 dB bandwidth of around 12.4 GHz (2.91 – 15.3 GHz) and VSWR < 2 except for two notched lower 5G bands of 3.3 – 4.2 GHz and 4.5 – 5.5 GHz. Besides, the proposed antenna has achieved a peak radiation efficiency of more than 80 % for UWB, while at the notched bands as low as 40%. Moreover, the proposed antenna is compact with a dimension of 29×23 mm2 that makes it suitable for lower 5G bands application.

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Erratum: “Giant polarization charge density at lattice-matched GaN/ScN interfaces” [Appl. Phys. Lett. 115, 232103 (2019)]

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Applied Physics Letters 2021年第6期119卷

作者： Nicholas L. Adamski Cyrus E. Dreyer Chris G. Van de Walle 1Department of Electrical and Computer Engineering University of California Santa Barbara California 93106-9560 USA 2Department of Physics and Astronomy Stony Brook University Stony Brook New York 11794-3800 USA and Center for Computational Quantum Physics Flatiron Institute (a division of the Simons Foundation) 162 5th Avenue New York New York 10010 USA 3Materials Department University of California Santa Barbara California 93106-5050 USA

In the original published article (Ref. 1), the following two minor errors were identified:

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Solving Lur'e equations through zeroing neural networks

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Information Sciences 2025年 718卷

作者： Yu He Xiaojuan Wang Yafei Tie Huanqi Yang Theodore E. Simos Spyridon D. Mourtas Vasilios N. Katsikis School of Computer Science and Artificial Intelligence Huanghuai University Zhumadian 463000 China Henan International Joint Laboratory of Behavior Optimization Control for Smart Robots Henan 463000 China Henan Key Laboratory of Smart Lighting Zhumadian 46300 China Hangzhou Dianzi University School of Mechanical Engineering Er Hao Da Jie 1158 Xiasha Hangzhou 310018 China Center for Applied Mathematics and Bioinformatics Gulf University for Science and Technology West Mishref 32093 Kuwait Section of Mathematics Dept. of Civil Engineering Democritus Univ. of Thrace Xanthi 67100 Greece Department of Economics Division of Mathematics-Informatics and Statistics-Econometrics National and Kapodistrian University of Athens Sofokleous 1 Street 10559 Athens Greece Laboratory “Hybrid Methods of Modelling and Optimization in Complex Systems” Siberian Federal University Prosp. Svobodny 79 660041 Krasnoyarsk Russia

Solving Lur'e equations plays a critical role in addressing linear-quadratic optimal control (LQOC) problems, especially in cases where the control cost matrices are singular. This paper introduces, for the first time, two novel zeroing neural network (ZNN) models—ZNNLE and ZNNLE-LQOC—specifically designed to solve the Lur'e equation system and the LQOC problem, respectively. The proposed models extend the applicability of the ZNN methodology to these challenging scenarios by offering robust and efficient solutions to time-varying matrix equations. Theoretical analyses confirm the validity of both models, while numerical simulations and practical applications demonstrate their effectiveness. Moreover, a comparative study with an enhanced alternating-direction implicit (ADI) method highlights the superior performance of the ZNNLE-LQOC model in solving LQOC problems.

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Doppler tracking and compensation for underwater acoustic channels using shift-orthogonal pilot sequences

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Proceedings of Meetings on Acoustics 2020年第1期42卷

作者： Ali Mohamad Bassam Mae L. Seto 1Department of Electrical & Computer Engineering Dalhousie University Halifax Nova Scotia B3H4R2 CANADA al903300@dal.ca 2Department of Mechanical Engineering Halifax Nova Scotia B3J1Z1 CANADA mz715250@cs.dal.ca

A novel time-domain Doppler tracker and compensator, using shift-orthogonal OFDM pilot sequences, was developed and assessed in simulations and early in-water trials. The objective is to address large Mach numbers like those experienced in the acoustic communications of autonomous underwater vehicles (AUV). To start, the Doppler estimator extracts pilots in the received signal to produce Mach number estimates for every received signal sample. Given the large number of estimator samples, a Doppler tracker is proposed to reduce the number and simultaneously track Mach number variations. This novel tracker reduces the computational load on the compensator and makes it possible to implement on AUVs. Then, the Doppler compensator's first stage resamples the received signal using the Mach number estimates from the tracker's output. Since the estimates vary with time, the resampling performed is time-varying. Then, the final stage estimates the residual Doppler shift from the estimator and eliminates it with a phase rotation. The proposed receiver subsystem outperforms most existing compensators as measured through the mean-squared error, is more computationally efficient and addresses higher Mach numbers. Each element of the proposed receiver is tested in simulations and the results are shown to agree with theory. Comprehensive at-sea trials are next.

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Heat distribution in the deep drawing device components working by high temperatures 10

Heat distribution in the deep drawing device components work...

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10th International Conference Machine and Industrial Design in Mechanical engineering, KOD 2018

作者： Tropp, M. Brumerčík, F. Šteininger, J. Weis, P. Glowacz, A. Univerzity of Žilina Faculty of Mechanical Engineering Department of Design and Mechanical Elements Univerzitná 1 Žilina010 26 Slovakia AGHUniversity of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Al. A. Mickiewicza 30 Kraków30-059 Poland

The subject of the article is a simulation of heat affected components of a device for deep drawing by extreme conditions in vacuum by high temperatures required for forming of crystallization containers made from thin molybdenum sheets. The simulation is focused on the distribution of heat in particular components in relation with their shape. There are presented the design of working components and the boundary conditions of transient thermal simulations with the results. © 2018 Institute of Physics Publishing. All rights reserved.

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Problem solving process for heat and mass transfer modeling

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AIP Conference Proceedings 2019年第1期2177卷

作者： Perepi Rajarajeswari M. Ravikumar 1Department of Computer science and Engineering Kingston Engineering College Vellore India 2Department of Mechanical Engineering Kingston Engineering College Vellore India

Normally in engineering, conceptual models provide formal model of the system. Mathematical modeling gives the systematic representation in terms of properties. Modeling process is performed by using design space analysis and mathematical equations and this can be performed with different design alternatives. Conceptual analysis of natural convection is described. In this paper the modeling of heat and mass transfer is performed with the concepts of heat and mass transfer and properties of objects in the design space. Numerical solution has been conducted for energy equation with different boundary conditions. The present work analyses the heat and mass transfer modeling process with mathematical equations.

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Atomistic investigation of diffusion welding of dissimilar materials through molecular dynamics simulation

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AIP Conference Proceedings 2020年第1期2256卷

作者： M. Zaenudin M. N. Mohammed Adhes Gamayel Ade Sunardi 1Department of Mechanical Engineering Faculty of Engineering and Computer Science Institut Teknologi & Kesehatan Jakarta (ITKJ) Jl. Jatiwaringin Raya No. 278 Pondok Gede 17411 Jakarta Indonesia 2Department of Engineering & Technology Faculty of Information Sciences and Engineering Management & Science University University Drive Off Persiaran Olahraga 40100 Shah Alam Selangor Malaysia

Molecular dynamics simulation of diffusion welding between aluminum and nickel has been performed and the tensile behavior of the as-welded material has been examined. Two slabs Al-Ni are being contacted directly to introduce diffusion between the two with certain parameters. Diffusion welding was performed at a temperature of 500 K, at the pressure of 10 MPa in the x-direction, and a holding time of 200 ps. The tensile test is performed at a strain value of 2.64e9/s. The results have shown that the displacement of atoms during diffusion welding significantly occurs from the beginning until it reaches about 10 ps. However, the movement of atoms experiencing a plateau stage and less atomic exchange is occurring afterward. nickel slab that has a better strength was able to maintain its fcc crystalline structure during diffusion welding and tensile test than aluminum which has lower strength. The higher melting point of Ni promoting better resistance in the interface to be deformed, while the lower melting point of Al has been promoting better bonding between the two that is promoted by the defects that occur at the interface. During the tensile test, the lower strength of Al made it randomly deformed and crack seems to occur. However, failure of the diffusion-welded Al-Ni has occurred around the interface. The ultimate tensile strength of the diffusion-welded Al-Ni reaches up to 4.166 GPa at a strain value of 0.07128.

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