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SSD object detection algorithm based on knowledge map

International Journal of Wireless and Mobile Computing 2024年第2期27卷 152-160页

作者： Huang, Li Wang, Xiaofeng Lu, Jianhua Hu, Wei Zhang, Changrong College of Computer Science and Technology Wuhan University of Science and Technology Hubei Wuhan China China Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System Wuhan University of Science and Technology Hubei Wuhan China Key Laboratory of Metallurgical Equipment and Control Technology of the Ministry of Education Wuhan University of Science and Technology Hubei Wuhan China Precision Manufacturing Research Institute Research Centre for Biomimetic Robot and Intelligent Measurement and Control Wuhan University of Science and Technology Hubei Wuhan China

With the pervasive integration of artificial intelligence into all aspects of human life, talent emerges as a primary resource. Upon analysing the current state of talent training in higher education institutions, issues such as dispersed knowledge points, overlapping content, a singular practice approach and ineffective evaluation have been identified. In response to these challenges, this paper proposes a multidisciplinary and comprehensive practical teaching methodology grounded in the knowledge graph framework. It delves into diverse paths for practical teaching and assessment, including aspects like teaching objectives, problem decomposition, resource integration, implementation methods and performance evaluation. The practical application of the SSD algorithm in researching service robot indoor object detection serves as an illustrative example. Employing the holistic practical teaching approach facilitated by the knowledge graph, this model guides students in acquiring object detection expertise, thereby enhancing their comprehensive development. Copyright © 2024 Inderscience Enterprises Ltd.

关键词： Object detection

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STUDY ON THE measurement METHOD OF GROUND CONDUCTIVITY OF INJECTED GROUND CURRENT FIELD 10

STUDY ON THE MEASUREMENT METHOD OF GROUND CONDUCTIVITY OF IN...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Ling, Zhongao Su, Zhong Zhao, Hui Wang, Yanke Cu, Sirui Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

The injected ground field technology is crucial for personnel localization and communication in complex geological environments, and accurate acquisition of ground conductivity information is a matter of communication quality and positioning accuracy. Aiming at the limitations of the traditional four-terminal electrode method of laying electrodes, this paper proposes a ground conductivity measurement method with non-linearly laid electrodes. The feasibility of the method was verified and analyzed in a numerical simulation environment. The results show that the method has good feasibility and accuracy, but attention should be paid to the effect of electrode asymmetry on the measurement results in the case of close distance between the detection electrode and the injection electrode. In the field measurement experiments, the standard deviation of the measured data of this method is less than 0.55 us/mm, and the maximum relative error is not more than 8.82%, which is able to meet the needs of the actual project, and provides a feasible solution for the measurement of conductivity under the complex geological environments, especially when the application of the traditional four-terminal electrode method is limited. © The Institution of Engineering & technology 2024.

关键词： FINITE ELEMENT NUMERICAL SIMULATION FOUR-TERMINAL ELECTRODE METHOD GROUND CONDUCTIVITY GROUND CURRENT FIELD NONLINEAR ELECTRODE PLACEMENT

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EQUIVALENT CONDUCTIVITY measurement METHODS FOR MIXED NON-HOMOGENEOUS MEDIA 10

EQUIVALENT CONDUCTIVITY MEASUREMENT METHODS FOR MIXED NON-HO...

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10th International Symposium on Test Automation and Instrumentation, ISTAI 2024

作者： Sun, Zhenzhen Su, Zhong Li, Fei Zhang, Zhicheng Beijing Key Laboratory of High Dynamic Navigation Technology Beijing Information Science and Technology University Beijing100192 China Key Laboratory of Modern Measurement and Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100192 China

ISBN: (纸本)9781837242672

Aiming at the problems of complicated electrode deployment and uncertain measurement range under a non-uniform medium in the "current-voltage" four-terminal method of conductivity measurement, a two-electrode equivalent conductivity measurement method based on the ground current field transport model is proposed. The "air-ground" layered medium ground current field transmission model is constructed, the equivalent conductivity model is further derived, the model error is corrected, and the simulation results show that the measurement accuracy of the uniform medium reaches 99%;the measurement results of the mixed non-uniform medium are in line with the theory;the dielectric conductivity increases firstly with the increase of the medium volume and then tends to be stable, and the measurement range of conductivity can be roughly determined accordingly. Under the two dry clay and soil environments, the measurement results are consistent with the soil EC value detector, which meets the application requirements. © The Institution of Engineering & technology 2024.

关键词： Electric conductivity measurement

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Graphene binding on black phosphorus enables high on/off ratios and mobility

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National Science Review 2024年第2期11卷 188-195页

作者： Fanrong Lin Zhonghan Cao Feiping Xiao Jiawei Liu Jiabin Qiao Minmin Xue Zhili Hu Ying Liu Huan Lu Zhuhua Zhang Jens Martin Qingjun Tong Wanlin Guo Yanpeng Liu Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Centre for Advanced 2D Materials National University of Singapore School of Physics and Electronics Hunan University Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and MeasurementSchool of PhysicsBeijing Institute of Technology Leibniz Institute für Kristallzüchtung

Graphene is one of the most promising candidates for integrated circuits due to its robustness against short-channel effects, inherent high carrier mobility and desired gapless nature for Ohmic contact, but it is difficult to achieve satisfactory on/off ratios even at the expense of its carrier mobility, limiting its device applications. Here, we present a strategy to realize high back-gate switching ratios in a graphene monolayer with well-maintained high mobility by forming a vertical heterostructure with a black phosphorus multi-layer. By local current annealing, strain is introduced within an established area of the graphene, which forms a reflective interface with the rest of the strain-free area and thus generates a robust off-state via local current depletion. Applying a positive back-gate voltage to the heterostructure can keep the black phosphorus insulating, while a negative back-gate voltage changes the black phosphorus to be conductive because of hole accumulation. Then, a parallel channel is activated within the strain-free graphene area by edge-contacted electrodes, thereby largely inheriting the intrinsic carrier mobility of graphene in the on-state. As a result, the device can provide an on/off voltage ratio of >10～3 as well as a mobility of ～8000 cm2V-1s-1at room temperature, meeting the low-power criterion suggested by the International Roadmap for Devices and Systems.

关键词： graphene on/off ratio mobility black phosphorus reflective interface

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High temperature piezoelectric properties and ultra-high temperature sensing properties of bismuth tungstate

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Journal of Advanced Ceramics 2024年第12期13卷 1931-1942页

作者： Yaoyao Liao Qingwei Liao Yuxiang Yin Yinghao Li Mingkun Du Hanqing Zhao Lingxia Li Yuying Wang Lei Qin Key Laboratory of Sensors Beijing Information Science&Technology UniversityBeijing 100192China Key Laboratory of Modern Measurement&Control Technology Ministry of EducationBeijing Information Science&Technology UniversityBeijing 100192China School of Microelectronics Tianjin UniversityTianjin 300072China Nanjing Light Xingjian Biological Technology Co. Ltd.Nanjing 210012China

In energy generation,aerospace,and other related industries,high-temperature acceleration sensing is an essential tool for diagnostic testing,troubleshooting,and quality ***,commercial acceleration sensors have a maximum operating temperature of no more than 550℃.The study of high-temperature piezoelectric ceramics is important for increasing the operating temperature of *** this work,high-temperature Bi_(2)Mo_(x)W_(1−x)O_(6)(BW)piezoelectric ceramics were prepared,and an all-mechanical center compression high-temperature acceleration sensor was designed and *** results show that when the doping ratio is x=0.001,the ceramic sample has the best performance:the relative density of 92%,the piezoelectric coefficient(d33)of 15 pC·N^(−1),the quality factor(Q_(m))of 1642,the dielectric constant(ε)of 307(1 kHz),and the dielectric loss(tanδ)of 0.33(1 kHz).With increasing B-doped Mo^(6+)content,the Curie temperatures of the ceramics are 975,966,961,and 967℃and the high-temperature annealing temperatures are 975,975,950,and 950°C,*** to tests of temperature performance,the developed BW high-temperature sensor has a good linear response and *** room temperature,a BW high-temperature piezoelectric sensor can be used stably within 1 kHz,and the average sensitivity is 3.259 pC·g^(−1).At 800℃,this device can be used in the frequency range of 0.1–1.1 kHz,and the average sensitivity is 3.305 pC·g^(−1);the linearity is greater than 0.99,and the sensitivity deviation is 1.4%.

关键词： high-temperature sensing acceleration sensor bismuth tungstate(BW) piezoelectric

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Effectiveness Verification of Bearing Health Assessment Method Based on SAE-MD 6th

Effectiveness Verification of Bearing Health Assessment Meth...

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6th China Aeronautical Science and technology Conference, CASTC 2023

作者： Jie, Zhenguo Shen, Yong Chen, Lijing Guo, Peipei Xu, Zhi Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai China AVIC Shanghai Aero Measurement and Control Technology Research Institute Shanghai China

ISBN: (纸本)9789819988631

To verify the effectiveness of the health assessment model, experimental validation research on helicopter dynamic component was conducted. Firstly, the health representation of bearing signals was self-learning by stacked auto-encoder, and the health representation was input to Mahalanobis distance for health assessment. Then, the comprehensive design of test and verification profile for evaluating the degradation capability of bearing performance was carried out. Finally, the bearing degradation test and signal acquisition was carried out, and the collected vibration signals was analyzed and processed using the stacked auto encoder and Mahalanobis distance method, which verified the effectiveness of the health assessment methods proposed in this paper. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： Signal encoding

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Research on Identification Method of Toroidal Propeller

Research on Identification Method of Toroidal Propeller

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2024 International Conference on measurement, Communication, and Virtual Reality, MCVR 2024

作者： Han, Chuang Hu, Aiai Wu, Haibin Heilongjiang Province Key Laboratory of Laser Spectroscopy Technology and Application Harbin University of Science and Technology Harbin China School of Measurement - Control Technology and Communication Engineering Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781510691773

With the continuous development of marine science and technology, propeller shapes are developing in a more complex direction. Among them, the toroidal propeller represents the latest research progress in propeller technology. This design features a ring-shaped geometry for the blades, which are similar to the catenary curve of a hanging chain. This propeller offers the advantages of higher efficiency and lower noise. In this paper, starting from the geometric shape analysis study of toroidal propeller, we introduce the geometric parameters such as wheelbase, outboard angle, lateral inclination angle among others, derive the mathematical formula of the coordinates of toroidal propeller in detail, simulate the modulation waveform and spectrogram of the toroidal propeller, and compare with those of the ordinary propeller, and according to the experimental data, the geometric shape of toroidal propeller can be recognized by using the proposed method. This lays a firm foundation for further research on the physical properties and scientific problems of toroidal propellers. © 2025 SPIE.

关键词： Geometry

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Cognitive Load State Analysis of Drivers Using Multimodal Physiological Data and Machine Learning in a VR Simulator

Cognitive Load State Analysis of Drivers Using Multimodal Ph...

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2024 International Conference on measurement, Communication, and Virtual Reality, MCVR 2024

作者： Tao, Xinyu Ma, Dezhong Xiong, Xiaotong College of Measurement-control Technology & Communications Engineering Harbin University of Science & Technology Harbin China Heilongjiang Province Key Laboratory of Laser Spectroscopy Technology and Application Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781510691773

Driver inattention is the primary cause of highway accidents. Various distractions can impair driving performance, posing a significant threat to road safety. This study uses a VR driving simulator to examine distracted driving, creating a simulated driving environment. It involves designing main and sub-driving tasks to replicate the cognitive load and distractions experienced by drivers. Data are collected using NASA-TLX scales, eye-tracking technology, and physiological signal acquisition. The impact of different distraction workloads on driver performance was assessed using statistical analysis and support vector machines (SVM). A multi-source data fusion model was developed to discriminate distracted driving behaviors. This research aims to provide theoretical insights and practical guidance for improving safe driving practices. © 2025 SPIE.

关键词： Automobile driver simulators

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Construction of Pressure Vessel Accident Emergency Drill System and Design of Scoring Mechanism based on Virtual Reality technology

Construction of Pressure Vessel Accident Emergency Drill Sys...

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2024 International Conference on measurement, Communication, and Virtual Reality, MCVR 2024

作者： Wang, Xinmiao Ma, Dezhong Niu, Chenchen Han, Yichi Li, Zhichao College of Measurement-control Technology & Communications Engineering Harbin University of Science & Technology Harbin China Heilongjiang Province Key Laboratory of Laser Spectroscopy Technology and Application Harbin University of Science and Technology Harbin China

ISBN: (纸本)9781510691773

To address the issues of high risk, high cost, limited coverage, and low effectiveness in pressure vessel emergency drills, this study aims to construct a pressure vessel accident emergency drill system based on virtual reality technology. The system utilizes Unity3D to develop a human-computer interaction interface and implements various functional modules using C# scripting. The system incorporates features such as scenario simulation, safety education and training, interactive operations, multi-player collaboration, and feedback and evaluation, enabling drill participants to train and examine their emergency response skills within a virtual environment. To ensure the objectivity and comprehensiveness of the scoring system, this study employs a combined weighting method of the Entropy Weight Method and Analytic Hierarchy Process to analyze the weights of the operational steps in the exercise process. A comprehensive and objective scoring mechanism for the pressure vessel accident emergency exercise system has been designed, which evaluates the performance of the exercise personnel from multiple dimensions and levels. Furthermore, a comprehensive and objective rating mechanism for the emergency drill system of pressure vessels was designed to evaluate the performance of the drill personnel from multiple dimensions and hierarchical levels. This system effectively enhances participants' abilities in rapid response, emergency handling, and teamwork during accidents. © 2025 SPIE.

关键词： Virtual environments

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Multi-stream fusion network for continuous gesture recognition based on sEMG

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International Journal of Wireless and Mobile Computing 2024年第4期26卷 374-383页

作者： Li, Jun Zou, Chunlong Tang, Dalai Sun, Ying Fan, Hanwen Li, Boao Tang, Xinjie Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering Wuhan University of Science and Technology Hubei Wuhan China College of Mechanical Engineering Hubei University of Automotive Technology Hubei Shiyan China Inner Mongolia University of Finance and Economics Hohhot China Research Centre for Biomimetic Robot and Intelligent Measurement and Control Wuhan University of Science and Technology Hubei Wuhan China Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education Wuhan University of Science and Technology Hubei Wuhan China

Dynamic gesture recognition is an essential step in human-computer interaction. However, dynamic gesture recognition based on Surface Electromyography (sEMG) signals faces issues such as incomplete feature extraction and incomplete recognition of temporal information between continuous gestures. Therefore, this paper proposes a multi-stream fusion network (MSK-LCNN) for dynamic gesture recognition to improve accuracy. We combine CNN and LSTM models into a unified framework which extracts spatio-temporal information both globally and in depth, and combines feature fusion to retain essential information. This framework uses an attention mechanism (SKNet) to learn more intricate feature information. The gesture recognition accuracy of this method on our data set is 95.23%, and on the NinaPro DB1 data set, it is 91.45%, which outperforms other similar networks in recent years. Applying this algorithm to prosthetic hand control has achieved flexible and stable control of the prosthetic hand. © 2024 Inderscience Enterprises Ltd.

关键词： Gesture recognition

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