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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Li, Da Rong, Bao Rui, Xiaoting Liu, Yixin Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing China National Key Laboratory of Complex Multibody System Dynamics Nanjing China

ISBN: (纸本)9789819980475

Cotton fiber is a natural material composed of cellulose that exhibits excellent water absorption properties. Centrifugal dewatering is typically required during the processing of cotton fibers. However, the water absorbed by the fibers can affect the dewatering process, leading to reduced efficiency and lower quality. To investigate the effects of factors such as fiber water absorption and centrifugal speed on the dewatering process, a numerical model based on the conservation of liquid inside and outside the fiber was developed in this study. The findings provide valuable insights into the dewatering process of cotton fiber-like materials and serve as an important theoretical foundation for future research in this area. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Numerical models

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Improved Image Matching Method Between SAR and Optical Based on Gaussian Vote by Ballot 11th

Improved Image Matching Method Between SAR and Optical Based...

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11th China Conference on Command and Control, C2 2023

作者： Yang, Yanjiao Wang, Ziwei Qu, Guangzhou Ma, Meng Liu, ShuaiShuai Chi, QingXi Beijing Electro-Mechanical Engineering Institute Beijing China Science and Technology on Complex System Control and Intelligent Agent Coopration Laboratory Beijing China

ISBN: (纸本)9789819990207

Aiming to obtain the high-precision matching position and reduce time and resource requirements, an image matching method between SAR and optical based on CSP-DenseNet and Gaussian vote by ballot is proposed. First, in order to detect stable interest points and extract deep feature in SAR image, we use FAST operator and CSP-DenseNet. Then, in order to save time and resource requirements, we use gaussian vote by ballot to determine the high-precision matching position between two *** simulation results reveal the validity of the algorithm. © Chinese Institute of Command and Control 2024.

关键词： Synthetic aperture radar

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Online Queue-Aware Service Migration and Resource Allocation in Mobile Edge Computing

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IEEE Transactions on Vehicular technology 2025年第5期74卷 8063-8078页

作者： Du, An Jia, Jie Chen, Jian Wang, Xingwei Huang, Ming Northeastern University School of Computer Science and Engineering Engineering Research Center of Security Technology of Complex Network System Key Laboratory of Intelligent Computing in Medical Image Ministry of Education Shenyang110819 China Northeastern University School of Computer Science and Engineering Shenyang110819 China

Mobile edge computing (MEC) integrated with Network Functions Virtualization (NFV) helps run a wide range of services implemented by Virtual Network Functions (VNFs) deployed at MEC networks. This emerging paradigm offers flexible edge resource management for Internet Service Providers (ISPs) and improves service satisfaction of diverse applications. However, a critical challenge lies in processing extremely unpredictable and bursty traffic flow, especially in event-trigger sensing tasks. In this paper, we study queue-aware service migration and resource allocation in an MEC network, where different devices with different arrival patterns request different network services. To this end, we first formulate a novel long-term operation cost minimization problem subject to the stability of multiple queues by adopting a simultaneous migration scheme and determining resource allocation dynamically. To address the problem efficiently, we propose an online control framework to make decisions without any prior system information. We first adopt the Lyapunov optimization technique to decompose the long-term optimization problem into multi-per-slot subproblems. Then, we adopt a decoupled optimization algorithm based on the coordinate descent method and augmented Lagrangian method to solve the offline mixed integer non-linear programming (MINLP) subproblems. Extensive results reveal that the proposed online optimization framework can efficiently balance queue stability and cost consumption. © 1967-2012 IEEE.

关键词： Mobile edge computing

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An Anomaly Detection Method Based on Adaptive Log and Dual Feature Fusion Analysis for Distributed systems 11

An Anomaly Detection Method Based on Adaptive Log and Dual F...

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11th International Conference on Information systems and Computing technology, ISCTech 2023

作者： Jia, Yijiang Li, Kefei Lu, Ping Xie, Baodi Wang, Huayang Chen, Jincai Huazhong University of Science and Technology School of Computer Science and Technology Wuhan China Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Wuhan China National Key Laboratory of Modeling and Simulation for Complex Systems Beijing China

ISBN: (纸本)9798350342406

In this study, we present a middleware-based approach for detecting anomalies in distributed systems. Our method facilitates the dynamic collection of logs at various levels of detail and incorporates an a priori dictionary-based compression strategy to process and transmit logs, minimizing the performance impact on distributed systems. Additionally, we utilize a dual feature fusion technique to analyze the logs. We evaluate the effectiveness of our approach by performing anomaly detection in a publish/subscribe distributed system and comparing it with existing methods. The results illustrate that our method outperforms other approaches, demonstrating superior performance. © 2023 IEEE.

关键词： Anomaly detection

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simulation Analysis on the Ignition Mechanism of Box Propellant Under Temperature Variation Condition 2nd

Simulation Analysis on the Ignition Mechanism of Box Propell...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhao, Xin Rui, Xiaoting Wang, Yan Chai, Haodong Zhang, Bowen Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing University of Science and Technology Nanjing210094 China

ISBN: (纸本)9789819980475

Box propellant is subject to undergo a long storage time before charging, during which accidents can cause huge casualties and economic losses. In order to reveal the ignition mechanism of box propellant, it is necessary to simulate realistically the hot spot formation process of propellant grains under different environments. The key to solving this problem is to establish a mathematical model that can couple the dynamic temperature distribution of actual storage environment and the thermal decomposition reaction of nitrate. This paper attempts to obtain the dynamic relationship between the exothermic rate of propellant and temperature based on nitrate reaction kinetics, to construct the energy source term describing the self-decomposition heat generation of propellant, and then truly reproduce the ignition process of box propellant under different environments based on a finite volume model of propellant—box. Overall, this method makes it feasible to simulate the self-ignition process of propellant under dynamic storage conditions, providing a theoretical basis for revealing the self-ignition mechanism of box propellant. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Thermolysis

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Numerical simulation Research on Cutting Forming Process of Energetic Materials 2nd

Numerical Simulation Research on Cutting Forming Process of ...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zhao, Pu Rong, Bao Rui, Xiaoting Xiao, Zhanhong Wang, Jun Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210000 China National Key Laboratory of Complex Multibody System Dynamics Nanjing University of Science and Technology Nanjing210000 China

ISBN: (纸本)9789819980475

In order to study the quality and thermal safety of energetic materials in the cutting forming process, the dynamic model and equation of a type of energetic material were established by using thermodynamic couple method, and the finite element simulation and analysis were performed. The simulation results show that the temperature concentration of the tool surface were distributed in the contact area between the cutting tool and energetic material during the cutting forming process. With the increase of cutting times, the temperature of the tool surface gradually rose. After two times of cutting, the tool surface temperature reaches 25.500 °C. The change conforms to the law, indicating a theoretical criterion for evaluating the thermal safety of energetic material cutting process. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Temperature

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Preparation and Rheological Response of Dual-Coated Carbonyl Iron Based Magnetorheological Fluid 2nd

Preparation and Rheological Response of Dual-Coated Carbonyl...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Han, Wen Jiao Wang, Xin Wang, Guo Ping Yang, Fu Feng Institute of Launch Dynamic Nanjing University of Science and Technology Nanjing210094 China National Key Laboratory of Complex Multibody System Dynamics Nanjing University of Science and Technology Nanjing210094 China

ISBN: (纸本)9789819980475

Magnetorheological fluid (MRF) is a stimuli-responsive materials whose rheological properties can instantaneously transform into a solid-like state under the stimulation of an external magnetic field (MF). However, MRF still has problems in engineering applications which should be improved. In particular, sedimentation stability is one of the major problems caused by the large size and high density of the magnetic particles used. Herein, dual coated carbonyl iron (CI) particle with silica and carbon nanotubes (CNT) shell was fabricated and applied as for the MRF. The silica shell was synthesized firstly, and then CNT was loaded to the surface of silica coated composite by self-assembly. The obtained dual coated CI particle not only exhibited soft-magnetic properties, but also greatly reduced density compared with CI. The dual-coated CI based MRF was prepared and its rheological properties and damping performances were investigated. Changes in the rheological properties of MRF induced by MF stimulation were tested by a rotational rheometer equipped with a MF applicator for steady-state shear and dynamic oscillation at various MF strengths. Moreover, the sedimentation testing provides information about the dispersion MR response. The CI@SiO2/CNT‐based MRF with a transient, reversible, and controllable MR response is considered a promising MRF for intelligent control applications. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Magnetorheological fluids

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Study on the Effect of Dynamics Factors on Extrusion Forming Process of Single-Hole Energetic Materials by Finite Element Method 2nd

Study on the Effect of Dynamics Factors on Extrusion Forming...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Zou, Jingyu Rong, Bao Rui, Xiaoting Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210000 China National Key Laboratory of Complex Multibody System Dynamics Nanjing University of Science and Technology Nanjing210000 China

ISBN: (纸本)9789819980475

Extrusion forming process is an important process in the manufacturing of energetic materials. In order to optimize the extrusion forming process of single-hole energetic materials and improve the quality of products, the dynamics modeling and simulation of this process are carried out by finite element method in this work. Based on the proposed dynamics model, the forming process under the conditions of different dynamics factors such as forming speed and different die structure parameters is simulated using the control variate method, and the effects of these dynamics factors are analyzed in this work. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Finite element method

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Study on the Rheological Properties of Propellant Substitute During Plasticization Process 2nd

Study on the Rheological Properties of Propellant Substitute...

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2nd International Conference of Mechanical system Dynamics, ICMSD 2023

作者： Shao, Xiejian Rong, Bao Yu, Hailong Rui, Xiaoting Institute of Launch Dynamics Nanjing University of Science and Technology Nanjing210000 China National Key Laboratory of Complex Multibody System Dynamics Nanjing University of Science and Technology Nanjing210000 China

ISBN: (纸本)9789819980475

In order to investigate the rheological properties of the propellant substitute during the plasticization process of propellant, and provide a basis for process stability and mold design, a capillary rheometer was used to study the rheological properties of the mixture in the plasticization process of the propellant substitute at different solvent ratios and temperatures. Regression analysis was conducted to determine the non-Newtonian index (n) and viscosity flow activation energy (ΔEη) of the substitute. The experimental results demonstrate that the propellant substitute exhibits typical pseudoplastic fluid behavior. Within the range of experimental conditions, an increase in shear rate leads to a decrease in apparent viscosity of the substitute, which conforms to the Ostwald-de Wale power-law model. Moreover, with increasing temperature and solvent ratio, the apparent viscosity of the substitute decreases, accompanied by an increase in the value of n, indicating a reduction in non-Newtonian behavior. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Viscosity

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An efficient adaptive space partitioning algorithm for electromagnetic scattering calculation of complex 3D models

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Journal of systems Engineering and Electronics 2021年第5期32卷 1071-1082页

作者： HUANG Minjie ZHOU Yaoming WANG Yongchao LIU Zhongtie School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of Complex Aviation System Simulation Beijing 100076China

The space partitioning algorithm based on the rounding and addressing operations has been proved to be an efficient space partitioning algorithm with the potential for real-time *** improvement on this kind of space partitioning algorithms for solving complex 3D models is *** examples show that the efficiency of the improved algorithm is better than that of the original *** the size of most target elements is smaller than the size of spatial grids,the efficiency of the improved method can be more than four times of that of the original *** adaptive method of space partitioning based on the improved algorithm is developed by taking the surface element density or the curvature as the threshold for deep partitioning and conducting the deep partitioning using the octree method.A computer program implementation for applying the method in some typical applications is discussed,and the performance in terms of the efficiency,reliability,and resource use is *** testing shows that the results of the adaptive spacing partitioning are more convenient for the follow-up use than that of the basic uniform space ***,when it is used to calculate the electromagnetic scattering of complex targets by the ray tracing(RT)method,the adaptive space partitioning algorithm can reduce the calculation time of the RT process by more than 40%compared with the uniform space segmentation algorithm.

关键词： adaptive space partitioning computer graphics binary space partitioning ray tracing(RT)method stealth technology

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