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2nd International Conference on Deep Sciences for Computing and Communications, IconDeepCom 2023

作者： Ananthi, M. Mangayarkarasi, T. Department of Computer Science and Business Systems Sri Sairam Engineering College Chennai India Department of Instrumentation and Control Engineering Sri Sairam Engineering College Chennai India

ISBN: (纸本)9783031689079

Massive streaming data is the most current technology for storing and manipulating large quantities of data. Processing the substantial amount of streaming data is still a challenging issue. The speed and throughput can be improved while extracting this huge amount of data by using a dynamic query processing technique. The sector-based incremental clustering indexing and scalable deletion approach is used in this paper to improve the system performance. Stream processing can be more effective and flexible by applying dynamic query processing technique. Incremental clustering using sector-based method and scalable deletion which removes unwanted, spurious data is proposed in this work in order to process incoming streaming data effectively. Incremental clustering is one of the clustering methods used for processing dynamic information. It is not necessary to plan the entire dataset ahead of time in this method which is suitable for live streaming data, because it processes one instance at a time. So, less space and time is used. Various queries with different types of datasets executed using sector based incremental clustering and scalable deletion methods. The proposed system achieves the highest results for more than 90% accuracy with less space and more speed when the execution time and data retrieval are empirically increased compared with conventional approaches. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Data streams

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Efficient and Safe Learning-based control of Piecewise Affine systems Using Optimization-Free Safety Filters 63

Efficient and Safe Learning-based Control of Piecewise Affin...

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63rd IEEE Conference on Decision and control, CDC 2024

作者： He, Kanghui Shi, Shengling Van Den Boom, Ton De Schutter, Bart Delft University of Technology Delft Center for Systems and Control Delft Netherlands Massachusetts Institute of Technology Department of Chemical Engineering CambridgeMA United States

ISBN: (纸本)9798350316339

control of piecewise affine (PWA) systems under complex constraints faces challenges in guaranteeing both safety and online computational efficiency. Learning-based methods can rapidly generate control signals with good performance, but rarely provide safety guarantees. A safety filter is a modular method to improve safety for any controller. When applied to PWA systems, a traditional safety filter usually need to solve a mixed-integer convex program, which reduces the computational benefit of learning-based controllers. We propose a novel optimization-free safety filter designed to handle state constraints that involve a combination of polyhedra and ellipsoids. The proposed safety filter only utilizes algebraic and min-max operations to determine safe control inputs. This offers a notable advantage compared with traditional safety filters by allowing for significantly more efficient computation of control signals. The proposed safety filter can be integrated into various function approximators, such as neural networks, enabling safe learning throughout the learning process. Simulation results on a bicycle model with PWA approximation validate the proposed method regarding constraint satisfaction, CPU time, and the preservation of sub-optimality. © 2024 IEEE.

关键词： Integer programming

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Origin of superlubricity of diamond-like carbon(DLC)

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Friction 2025年第1期13卷 85-99页

作者： Seokhoon Jang Zhe Chen Seong H.Kim Department of Chemical Engineering and Materials Research Institute Pennsylvania State UniversityUniversity ParkPA 16802USA State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China

Hydrogenated diamond-like carbon(H-DLC)is typically produced as a coating or thin film through plasma-enhanced chemical vapor deposition(PE-CVD).H-DLC is relatively hard and well known to exhibit *** superlubricity an intrinsic property of H-DLC?This paper argues that H-DLC is not intrinsically superlubricious,but it has an ideal structure that allows transition of the interface region to a superlubricious structure upon frictional shear in proper ***,its superlubricity is an extrinsic *** argument is made by comparing frictional behaviors of three allotropes of carbon materials—graphite,amorphous carbon(a-C),and diamond,and carefully scrutinizing the run-in behavior as well as environment sensitivity of H-DLC *** superlubricious structure is generally known to be graphitic,but its exact structure remains elusive and is subject to further ***,accurate knowledge of how superlubricity is induced for H-DLC can guide engineering design to achieve superlubricious behaviors with other carbon materials produced via different synthetic routes.

关键词： superlubricity diamond-like carbon(DLC) run-in environmental sensitivity

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Pseudo-Linearization Observer-Based Tracking control of Boiler-Turbine-Generator System Using Linear Matrix Inequalities 10

Pseudo-Linearization Observer-Based Tracking Control of Boil...

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10th International Conference on control, Instrumentation and Automation, ICCIA 2024

作者： Kalamian, Nasrin Keshavarz-Mohammadiyan, Atiyeh Tafresh University Department of Electrical Engineering Tafresh Iran Smart Control Systems Department Tehran Iran

ISBN: (纸本)9798331509972

This paper deals with the problem of controller and observer design for the nonlinear, highly coupled constrained boiler-Turbine-generator system. The input vector (control valve state) has upper and lower limits, which poses a challenge in the controller design process. Moreover, the nonlinear relationship between system output and the inputs and state variables in the observation model, makes the design procedure more challenging. To solve these problems, extended pseudo-linearization technique is utilized, which simplifies the controller design and avoids instability. Since, the resulting pseudo-linear model has state-dependent coefficients, a new state-dependent observer is also designed in this paper. To ensure the stability of the proposed method, a time-varying Lyapunov function is defined to guarantee convergence of both state estimation and tracking errors, throughout Linear Matrix Inequalities (LMIs). Simulations are carried out on a 160-MW boiler-Turbine-generator unit to validate effectiveness and stability of the proposed method, confirming control signals saturation limit satisfaction. © 2024 IEEE.

关键词： Turbogenerators

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Decentralized Game-based Auction Algorithm for Scheduling Robotic Chargers to Service EVs with Uncertain Demands

IEEE Transactions on Intelligent Vehicles

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IEEE Transactions on Intelligent Vehicles 2024年 1-14页

作者： Fang, Qiuyang Zhang, Jianlei Wang, Chen Xie, Guangming Zhang, Chunyan Department of Automation College of Computer and Control Engineering Nankai University Tianjin China National Engineering Research Center of Software Engineering Peking University Beijing China State Key Laboratory for Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing China

In this study, we introduce a novel auction-based algorithm modeled as a decentralized coalition formation game, designed for the complex requirements of large-scale multi-robot task allocation under uncertain demand. This context is particularly illustrative in scenarios where robots are tasked to charge electric vehicles. The algorithm begins by partitioning a composite task sequence into distinct subsets based on spatial similarity principles. Subsequently, we employ a coalition formation game paradigm to coordinate the assembly of robots into cooperative coalitions focused on these distinct subsets. To mitigate the impact of unpredictable task demands on allocations, our approach utilizes the conditional value-at-risk to assess the risk associated with task execution, along with computing the potential revenue of the coalition with an emphasis on risk-related outcomes. Additionally, integrating consensus auctions into the coalition formation framework allows our approach to accommodate assignments for individual robot-task pairings, thus preserving the stability of individual robotic decision autonomy within the coalition structure and assignment distribution. Simulative analyses on a prototypical parking facility layout confirm that our algorithm achieves Nash equilibrium within the coalition structure in polynomial time and demonstrates significant scalability. Compared to competing algorithms, our proposal exhibits superior performance in resilience, task execution efficiency, and reduced overall task completion times. The results demonstrate that our approach is an effective strategy for solving the scheduling challenges encountered by multi-robot systems operating in complex environments. IEEE

关键词： Polynomial approximation

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Power and Voltage control Based on DC Offset Injection for Bipolar Low-voltage DC Distribution System

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Journal of Modern Power systems and Clean Energy 2023年第5期11卷 1529-1539页

作者： Xinyi Kong Jianwen Zhang Jianqiao Zhou Jiajie Zang Jiacheng Wang Gang Shi Xu Cai key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Department of Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Electronic and Electrical Engineering Shanghai University of Engineering ScienceShanghaiChina School of Mechatronic Systems Engineering Simon Fraser UniversitySurreyBCCanada

The bipolar low-voltage DC(LVDC) distribution system has become a prospective solution to better integration of renewables and improvement of system efficiency and reliability. However, it also faces the challenge of power and voltage imbalance between two poles. To solve this problem, an interface converter with bipolar asymmetrical operating capabilities is applied in this paper. The steady-state models of the bipolar LVDC distribution system equipped with this interface converter in the gridconnected mode and off-grid mode are analyzed. A control scheme based on DC offset injection at the secondary side of the interface converter is proposed, enabling the bipolar LVDC distribution system to realize the unbalanced power transfer between two poles in the grid-connected mode and maintain the inherentpole voltage balance in the off-grid mode. Furthermore, this paper also proposes a primary-side DC offset injection control scheme according to the analysis of the magnetic circuit model, which can eliminate the DC bias flux caused by the secondaryside DC offset. Thereby, the potential core magnetic saturation and overcurrent issues can be prevented, ensuring the safety of the interface converter and distribution system. Detailed simulations based on the proposed control scheme are conducted to validate the function of power and voltage balance under the operation conditions of different DC loads.

关键词： Bipolar low-voltage DC distribution system interface converter DC offset injection unbalanced power voltage balance

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AutYOLO-ATT: an attention-based YOLOv8 algorithm for early autism diagnosis through facial expression recognition

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Neural Computing and Applications 2024年第27期36卷 17199-17219页

作者： Hosney, Reham Talaat, Fatma M. El-Gendy, Eman M. Saafan, Mahmoud M. Computers and Control Systems Engineering Department Faculty of Engineering Mansoura University Mansoura Egypt Faculty of Artificial Intelligence Kafrelsheikh University Kafrelsheikh33516 Egypt Faculty of Computer Science and Engineering New Mansoura University Gamasa35712 Egypt Nile Higher Institute for Engineering and Technology Mansoura Egypt

Autism Spectrum Disorder (ASD) is a developmental condition resulting from abnormalities in brain structure and function, which can manifest as communication and social interaction difficulties. Conventional methods for diagnosing ASD may not be effective in the early stages of the disorder. Hence, early diagnosis is crucial to improving the patient's overall health and well-being. One alternative and effective method for early autism diagnosis is facial expression recognition since autistic children typically exhibit distinct facial expressions that can aid in distinguishing them from other children. This paper provides a deep convolutional neural network (DCNN)-based real-time emotion recognition system for autistic kids. The proposed system is designed to identify six facial emotions, including surprise, delight, sadness, fear, joy, and natural, and to assist medical professionals and families in recognizing facial expressions in autistic children for early diagnosis and intervention. In this study, an attention-based YOLOv8 (AutYOLO-ATT) algorithm for facial expression recognition is proposed, which enhances the YOLOv8 model's performance by integrating an attention mechanism. The proposed method (AutYOLO-ATT) outperforms all other classifiers in all metrics, achieving a precision of 93.97%, recall of 97.5%, F1-score of 92.99%, and accuracy of 97.2%. These results highlight the potential of the proposed method for real-world applications, particularly in fields where high accuracy is essential. © The Author(s) 2024.

关键词： Diagnosis

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Integrated System of Solid Oxide Fuel Cell and Ethanol Partial Oxidation: Process Simulation and Heat Exchanger Network 6th

Integrated System of Solid Oxide Fuel Cell and Ethanol Parti...

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6th International on Clean Energy and Electrical systems, CEES 2024

作者： Saebea, Dang Thanomjit, Chollaphan Arpornwichanop, Amornchai Patcharavorachot, Yaneeporn Interdisciplinary Centre for Decarbonisation & Green Energy Department of Chemical Engineering Faculty of Engineering Burapha University Chonburi20131 Thailand Center of Excellence in Process and Energy Systems Engineering Department of Chemical Engineering Faculty of Engineering Chulalongkorn University Bangkok10330 Thailand Department of Chemical Engineering School of Engineering King Mongkut’s Institute of Technology Ladkrabang Bangkok10520 Thailand

ISBN: (纸本)9789819757749

A solid oxide fuel cell (SOFC) fueled by reformate obtained from an ethanol partial oxidation (POX) was investigated regarding electrical and the thermal performances. Performance analysis was performed through Aspen Plus simulator. Gas compositions obtained from POX and SOFC were computed through the Gibbs free energy minimization method. Three voltage losses that include activation, ohmic and concentration losses was considered in an electrochemical model. Effects of operating parameters in both POX and SOFC on performance of SOFC-POX system were examined. From the simulation results, it was found that the suitable condition of POX was at the reformer temperature of 700 ℃ and oxygen to ethanol molar ratio of 0.1. While, the operating temperature of SOFC should be 900 ℃. Under these operating conditions, the maximum electrical and thermal efficiencies of 67.24% and 25.77%, respectively, can be achieved. Finally, the heat integration of the SOFC-POX system was considered using pinch analysis. The minimum cold utility is 88.1 kW while the hot utility is no need for this system. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Free energy

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A Versatile BenzimidazoleSubstituted Spirolactam Mechanophore:When Excited State Intramolecular Proton Transfer Couples with Rhodamine

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CCS Chemistry 2024年第7期6卷 1798-1809页

作者： Huan Hu Xin Cheng Zhimin Ma Qingyuan Yang Rint PSijbesma Zhiyong Ma Beijing Advanced Innovation Center for Soft Matter Science and Engineering State Key Laboratory of Organic-Inorganic CompositesCollege of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029 College of Engineering Peking UniversityBeijing 100871 Department of Chemical Engineering and Chemistry Institute for Complex Molecular SystemsEindhoven University of Technology5600 MBEindhoven

Exploration of multicolor mechanochromic bulk polymers based on a single mechanophore is a big challenge to ***,we report a versatile benzimidazole-substituted spirolactam mechanophore where excited state intramolecular proton transfer(ESIPT)coupled with *** mechanophore was facilely synthesized and then covalently linked to polyurethane(PU)*** PU film containing the mechanophore(1@PU)showed cooperative photochromism upon irradiation involving simultaneous enhancement of normalized enol and rhodol emissions based on a cooperative ESIPT process and the ring-opening reaction of ***,the film exhibited dual-mode multicolor mechanochromism upon stretching and *** normalized intensity of enol emission increased and the fluorescence turned from light green to cyan after stretching,then red coloration appeared from colorless after *** experiments and density functional theory calculations confirmed that the stretch-induced increase of enol emission was attributed to torsion of the dihedral angle between xanthene and benzimidazole in the mechanophore via force-induced disaggregation and direct force action on the isolated *** of the dihedral angle and the ring-opening reaction of spirolactam in a single mechanophore occurred sequentially during compression,resulting in an observed red *** study might provide a glimpse into the design of novel multicolor mechanochromic mechanophores.

关键词： mechanophore rhodamine excited state intramolecular proton transfer cooperative photochromism dual-mode mechanochromism

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Process simulation and exergy analysis of fermentative hydrogen and methane production

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International Journal of Hydrogen Energy 2025年 138卷 1336-1346页

作者： Peng, Yangyang Chen, Cheng Xia, Ao Huang, Yun Zhu, Xianqing Show, Pau-Loke Zhu, Xun Liao, Qiang Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing University Ministry of Education Chongqing400044 China Institute of Engineering Thermophysics School of Energy and Power Engineering Chongqing University Chongqing400044 China Department of Chemical & Petroleum Engineering Khalifa University PO Box 127788 Abu Dhabi United Arab Emirates Department of Chemical and Environment Engineering Faculty of Science and Engineering University of Nottingham Malaysia Jalan Broga Semenyih43500 Malaysia

The biogas production process involves a variety of biochemical reactions, which complicates the assessment of thermodynamic performance and the enhancement of process performance. In this study, simulations of the anaerobic digestion processes were carried out to explore the effects of organic loading rate (OLR) and hydraulic retention time (HRT) on biogas production performance. The thermodynamic performance of a conventional single-stage anaerobic digestion and a two-stage anaerobic digestion separating the hydrogen and methane production stages was also evaluated. The results showed that when OLR increased from 1.0 kg volatile solids (VS)/(m3·d) to 3.0 kg VS/(m3·d), the biogas yield increased slightly from 268.46 L/kg VS and then decreased by 17.41% to 221.72 L/kg VS. When HRT extended from 4 d to 20 d, the corresponding biogas yield increased by 28.38% (from 230.88 L/kg VS to 296.41 L/kg VS). The exergy efficiencies of single-stage and two-stage anaerobic digestion were 34.39% and 53.13%, respectively. Compared to the digestion unit in the single-stage system, the input exergy decreased by 3.09%, while the output exergy increased by 48.78% in the two-stage system. It mainly resulted from the enhancement of the exergy efficiency of the digestion unit from 35.58% to 54.63%. In particular, the biogas slurry and residue caused significant exergy losses. It accounted for 47.08% of the total input exergy of the single-stage system and 25.84% of that of the two-stage system, respectively. The utilization of these wastes can play an essential role in the further improvement of the exergy efficiency of anaerobic digestion. © 2024 Hydrogen Energy Publications LLC

关键词： Exergy

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