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8th International Conference on Computing, Control and Industrial Engineering, CCIE 2024

作者： Wang, Linna Wu, Bowen Guo, Pin China Academy of Launch Vehicle Technology R&D Center Beijing China

ISBN: (纸本)9789819769339

As a complex system engineering, the design of test and launch system is related to many specialties. A virtual system can be established by analyzing the architecture of test and launch system, the relationship between its various parts, and the requirements for launch program and training. A set of intuitive and common simulation models can be designed based on the technology of virtual test middleware, modular modeling encapsulation and distributed integration. The test and virtual launch system includes test application system, real time simulation system, auxiliary analysis tools, model integration environment and data management system. Compared with physical system, the simulation system is more comprehensive. The major factors affecting the launch and flight process are simulated. The functionality simulation and performance evaluation for the physical system are realized. Costs, deadlines and performance in both development and experiment can be optimized. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Middleware

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Improvement of Output Characteristics of a Large-Mode-Area Er-doped Fiber Amplifier Pulse Pumped by a Cascaded raman Fiber Laser With a Low repetition Frequency

IEEE Photonics Journal

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IEEE Photonics Journal 2023年第5期15卷 1页

作者： Nomura, Junia Ohata, Nobuo Mitsubishi Electric Corporation Information Technology R&d Center Kanagawa Kamakura247-8501 Japan

We improve the output of a MOPA system that emits single-frequency high-energy optical pulses using a large mode area Er-doped fiber amplifier pumped by a cascaded raman fiber laser with a low 150 Hz repetition frequency. It is found that the unwanted light generated in the cascaded raman fiber laser at the same time as the pump light saps the gain of the amplifier and degrades its output characteristics. By combining the removal of unwanted light with a pulse pump technique, the pulse energy is improved from less than 1.0 mJ to 1.2 mJ with at the same time a SNr of 30 dB compared to 19 dB before the improvement. The percentage of power in the signal also improves from 61.0% to over 90.7%. © 2009-2012 IEEE.

关键词： Pulsed lasers

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A review of Techniques for Lightweight Monocular depth Estimation 10

A Review of Techniques for Lightweight Monocular Depth Estim...

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10th IEEE Asia-Pacific Conference on Applied Electromagnetics, APACE 2024

作者： Man, Abdullah Abuajwa, Osama M. S. Hidayati Abdul Aziz, Nor Center of Robotic & Sensing Technology TM R&D Cyberjaya Malaysia Center For Intelligent Network TM R&D Cyberjaya Malaysia Multimedia University Center for Engineering Computational Intelligence Faculty of Engineering & Technology Melaka Malaysia

ISBN: (纸本)9798350364163

recent advancements in lightweight neural networks have enabled the deployment of monocular depth estimation (MdE) models on embedded platforms, including microcontrollers, mobile devices, and edge computing environments. Importantly, it allows the effective implementation of various applications, including visual synchronous localization and mapping (SLAM) in resource-constrained robotic systems. This review examines multiple approaches currently being explored for lightweight monocular depth estimation models, with a focus on techniques such as architecture optimization, network pruning and slimming, hybrid convolutional neural network (CNN)-transformer architectures, knowledge distillation, quantization, and low-precision computation, efficient training strategies, innovative loss functions, edge information utilization, energy-quality scalability, and improvements in up-sampling and decoders. This review highlights that combining architecture optimization, network pruning, and slimming with quantization and low-precision computation provides the optimal approach for reducing model parameters while preserving high accuracy. © 2024 IEEE.

关键词： SLAM robotics

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Semantic Segmentation of QrS complex in 12-Lead ECG Signals 46

Semantic Segmentation of QRS complex in 12-Lead ECG Signals

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46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2024

作者： de Paula da Silva, Mateus Costa, Marly G. F. Vieira, diego Giovani A. Costa Filho, Cicero F. F. Federal University of Amazonas R&d Center in Electronic and Information Technology Manaus Brazil

ISBN: (纸本)9798350371499

In this work we present a method for semantic segmentation of the QrS complex in 12-lead ECG signals. The dataset used in the work was St Petersburg INCArT 12-lead. The proposed method is comprised or three steps: 1. data preprocessing, where the binary vectors corresponding to the ground truth are obtained. In the ground truth vector, the samples corresponding to the QrS complex are identified as logical 1, while the other samples are identified as logical 0;2. segmentation of the QrS complex, using autoencoders. Three different autoencoder architectures, with different number of kernels in convolutions layers are evaluated;3. post-processing filters to remove noise, desgined using heuristic rules. The result obtained for detecting the QrS complex, an F1-score over 99.90%, is the state-of-the-art and surpasses the performance obtained with other methods previously published in the literature. © 2024 IEEE.

关键词： Semantic Segmentation

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Evaluation of depth-wise Separable Convolution and Channel Attention Mechanism to Bacilli Segmentation 46

Evaluation of Depth-wise Separable Convolution and Channel A...

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46th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2024

作者： Soares, ronaldo rodrigues Monteiro, Felipe Paes Pinheiro, Gabriel Martins Serrão, Mikaela Kalline MacIel Costa Filho, Cícero F. F. Costa, Marly G. F. Federal University of Amazonas R&d Center in Electronic and Information Technology Manaus Brazil

ISBN: (纸本)9798350371499

Tuberculosis (TB) is the second leading cause of death from a single infectious agent. In the field of computer vision, much works has been developed to automate the identification of bacilli in sputum smear microscopy field images. In recent years, deep machine learning techniques have been increasingly used. In this work, architectures with different depth, implemented with channel attention mechanism and with depth-wise separable convolution are evaluated to accomplish the task of bacilli segmentation in microscopy images. The best result was obtained with a deeper architecture, implemented with channel attention mechanism and depth-wise separable convolution, with an F1-score of 99.38%. © 2024 IEEE.

关键词： Semantic Segmentation

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Maintaining Average Torque and Suppressing Torque ripple With T-Shaped Auxiliary Pole for Spoke Type Multi-Consequent-Pole Motor

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IEEE Transactions on Energy Conversion 2025年第2期40卷 1400-1410页

作者： Hidaka, Yuki Takahashi, Sho Kondo, Shota Iezawa, Masahiro Nagaoka University of Technology Department of Electrical Electronics and Information Engineering Nagaoka940-2188 Japan Advanced Technology R&D Center Mitsubishi Electric Corporation Amagasaki661-8661 Japan

A novel stator structure for spoke-type multi-consequent-pole motors was proposed in this paper. While spoke-type multi-consequent pole motors were effective to improve torque density, it was necessary to allow for torque ripple increasing due to the non-uniform magnetic flux density in the air gap. Although torque ripple could be reduced using the I-shaped auxiliary pole reported in the previous study, worsen in average torque was needed to be tolerated. In the proposed motor, T-shaped auxiliary poles were placed on the stator to maintain torque and reduce torque ripple. The point of the proposed motor lies in the magnetic circuit in which the stator coil was divided into upper and lower coils, and the leakage flux, which was generated in the previous auxiliary pole, could be picked by the lower coil. To validate its effectiveness, numerical verification was conducted using the verification model and obtained results were compared with the conventional motors. Moreover, experimental verification was conducted using prototype motors. From the results, it was confirmed that torque ripple could be reduced without decreasing average torque by using the proposed stator structure. © 1986-2012 IEEE.

关键词： Magnetic circuits

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design of an integrated vehicle fluid system based on energy-fluid matching 74

Design of an integrated vehicle fluid system based on energy...

引用

74th International Astronautical Congress, IAC 2023

作者： Ai, Liqiang Yang, Wei Zhang, Wanxuan Wu, Shengbao Wang, Xiaowei R&D Center China Academy of Launch Vehicle Technology R&D Center 1 Nandahongmen Road Beijing100084 China

The integrated vehicle fluid (IVF) system integrates the functions of attitude control, electricity supply, and tank pressurization through the unified management of the high-specific-impulse cryogenic propellant of hydrogen and oxygen, which can significantly reduce the system redundancy. In a typical IVF system, a small internal combustion engine (ICE) burns gas hydrogen and oxygen evaporated from tank and generates electricity to supply the vehicle electrical equipment. The ICE provides necessary heat for liquid hydrogen and oxygen to convert to gas in heat exchanger (HEX). The gas hydrogen and oxygen are collected in accumulators and provide attitude control with hydrogen/oxygen thrusters. The gas in the accumulators are also used for self-pressurization of tank. Applying IVF could significantly reduce the types of propellant of space transportation vehicle, which has great advantage in future on-orbit refueling era. In this paper, a design of an integrated vehicle fluid system is proposed based on energy-fluid matching. The new system design has a couple of differences from previous IVF designs. Firstly, the ICE-burned gas hydrogen is taken from the evaporation waste of liquid hydrogen tank as usual, while the ICE-burned gas oxygen is supplied by the gas oxygen accumulator, which provides better control regulation capability of ICE power and seamlessly accommodates the subcooling of liquid oxygen. Secondly, a combined hydrogen-oxygen-coolant three-way HEX replaces the two separated hydrogen and oxygen HEX. Through two different heat exchanging stage, the heat obtained from ICE could be flexibly distributed between hydrogen and oxygen, while the temperature of both fluid at the outlet of HEX could be stably controlled. The system parameters and workflow of IVF is designed based on energy-fluid matching. The temperature, pressure, flow rate, heat, electricity of different modules must match with each other during four different operative mode of IVF. A modular in

关键词： energy-fluid matching hydrogen integrated vehicle fluid IVF oxygen

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research on design of Electric Vehicle Sound Synthesis Based on Frequency Shift Algorithm

Research on Design of Electric Vehicle Sound Synthesis Based...

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2024 SAE World Congress Experience, WCX 2024

作者： Yu, Shangbo Xie, Liping Lu, Chihua Qian, Yushu Liu, Zhien Songze, du Wuhan University of Technology China Fuzhou University China GAC R&D Center

The active sound generation systems (ASGS) for electric vehicles (EVs) play an important role in improving sound perception and transmission in the car, and can meet the needs of different user groups for driving and riding experiences. The active sound synthesis algorithm is the core part of ASGS. This paper uses an efficient variable-range fast linear interpolation method to design a frequency-shifted and pitch-modified sound synthesis algorithm. By obtaining the operating parameters of EVs, such as vehicle speed, motor speed, pedal opening, etc., the original sound signal is interpolated to varying degrees to change the frequency of the sound signal, and then the amplitude of the sound signal is determined according to different driving states. This simulates an effect similar to the sound of a traditional car engine. Then, a dynamic superposition strategy is proposed based on the Hann window function. Through windowing and superposition processing of each sound signal segment generated by the algorithm, the coherence and real-time performance of the synthesized engine sound are improved, so that the ASGS can quickly and accurately reflect the driving status of EVs. Finally, through the analysis and verification of the sound quality of the synthesized sound through different parameter adjustments, an engine synthesized sound that satisfies the subjective evaluation of sound quality can be obtained. This paper proposes an effective active sound synthesis algorithm for EVs, which ensures that EVs produce more textured engine sound while emphasizing the timeliness of synthesized sound. It plays an important role in improving pedestrian safety perception and driving experience, and promotes the research and development of ASGS for EVs. © 2024 SAE International. All rights reserved.

关键词： Quality control

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Improving lipid production by rhodotorula glutinis for renewable fuel production based on machine learning

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Frontiers of Chemical Science and Engineering 2024年第5期18卷 23-35页

作者： Lihe Zhang Changwei Zhang Xi Zhao Changliu He Xu Zhang National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China Collage of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Bioprocess Beijing University of Chemical TechnologyBeijing 10029China

Microbial lipid fermentation encompasses intricate complex cell growth processes and heavily relies on expert experience for optimal *** modeling of the fermentation process assists researchers in making intelligent decisions,employing logical reasoning and strategic planning to optimize lipid *** this study,the effects of medium components and concen-trations on lipid fermentation were investigated,*** then,leveraging the collated data,a variety of machine learning algorithms were used to model and optimize the lipid fermentation *** models,based on artificial neural networks and support vector machines,achieved r?values all higher than 0.93,ensuring accurate predictions of the fermentation *** linear regression was used to evaluate the respective target parameter,which were affected by the medium components of lipid ***,single and multi-objective optimiza-tion were conducted for lipid fermentation using the genetic *** results demonstrated the maximum biomass of 50.3 g·L^(-1) and maximum lipid concentration of 14.1 g:L^(-1) with the error between the experimental and predicted values less than 5%.The results of the multi-objective optimization reveal the synergistic and competitive relationship between biomass,lipid concentration,and conversion rate,which lay a basis for in-depth optimization and amplification.

关键词： microbial lipid machine learning artificial neural network support vector machine genetic algorithm

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Pitting corrosion initiated by SiO_(2)-MnO-Cr_(2)O_(3)-Al_(2)O_(3)-based inclusions in a 304 stainless steel

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Journal of Iron and Steel research International 2024年第9期31卷 2281-2293页

作者： Jin-zhen Hu Shi Li Ji Zhang Ying ren Li-feng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China School of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiChina Stainless Steel R&D Center of Central R&D Institute Baoshan Iron and Steel Co.Ltd.Shanghai201900China School of Mechanical and Materials Engineering North China University of TechnologyBeijing100144China

The influence of the aluminum content on the pitting corrosion of a 304 stainless steel by a Cl−solution was *** number,area,and composition of non-metallic inclusions were modified by the addition of aluminum in the steel,which was responsible for the variation of the corrosion degree of the 304 stainless *** detection,corrosion test,electrochemical test,thermodynamic calculation,and first-principles calculation were performed to evaluate the pitting corrosion of the stainless *** initiation of the pitting corrosion by three types of inclusions,including(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al_(2)O_(3)were in-situ *** corroding for 880 min,the corrosion index of(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al_(2)O_(3)was 0.38%,0.02%,and 0.00%min−1,*** the increase in aluminum content in the steel,the pitting potential of the stainless steel was 0.131,0.304,and 0.338 V,respectively,indicating that a higher aluminum content in the steel was beneficial to improving the pitting corrosion resistance of the 304 stainless steel.

关键词： Pitting corrosion 304 stainless steel Non-metallic inclusion First-principles calculation Galvanic corrosion

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