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Camouflaged target detection based on multimodal image input pixel-level fusion

Frontiers of Information Technology & Electronic Engineering 2024年第9期25卷 1226-1239页

作者： Ruihui PENG Jie LAI Xueting YANG Dianxing SUN Shuncheng TAN Yingjuan SONG Wei GUO qingdao Innovation and Development Base Harbin Engineering UniversityQingdao 266000China College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China Insitute of Information Fusion Naval Aeronautical UniversityYantai 264001China

Camouflaged targets are a type of nonsalient target with high foreground and background fusion and minimal target feature information,making target recognition extremely *** detection algorithms for camouflaged targets use only the target’s single-band information,resulting in low detection accuracy and a high missed detection *** present a multimodal image fusion camouflaged target detection technique (MIF-YOLOv5) in this ***,we provide a multimodal image input to achieve pixel-level fusion of the camouflaged target’s optical and infrared images to improve the effective feature information of the camouflaged ***,a loss function is created,and the K-Means++clustering technique is used to optimize the target anchor frame in the dataset to increase camouflage personnel detection accuracy and ***,a comprehensive detection index of camouflaged targets is proposed to compare the overall effectiveness of various *** crucially,we create a multispectral camouflage target dataset to test the suggested *** results show that the proposed method has the best comprehensive detection performance,with a detection accuracy of 96.5%,a recognition probability of92.5%,a parameter number increase of 1×10^(4),a theoretical calculation amount increase of 0.03 GFLOPs,and a comprehensive detection index of *** advantage of this method in terms of detection accuracy is also apparent in performance comparisons with other target algorithms.

关键词： Camouflaged target detection Pixel-level fusion Anchor box optimization Loss function Multispectral dataset

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Rapid transfer alignment for SINS of carrier craft

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Journal of Systems Engineering and Electronics 2013年第2期24卷 303-308页

作者： Jingshuo Xu Yongjun Wang Zhicai Xiao qingdao campus of naval aeronautical and Astronautical University Department of Control Engineering Naval Aeronautical and Astronautical University

In order to improve the survival ability and rapid response ability of the carrier craft,a new rapid transfer alignment method of the strapdown inertial navigation system（SINS） on a rocking base is put *** the method,the aircraft carrier does not need any form of ***,interfering motions such as rolling,pitching,and yawing motions caused by sea waves are effectively ***,the deck flexure deformation model is ***,the state space model of transfer alignment is ***,the feasibility of this method is validated by the *** results show that the misalignment angle error can be estimated and reach an anticipated precision-0.2 mrad in 5 s,while the deck deformation angle error can be estimated and reach a better precision- 0.1 mrad in 20 s.

关键词： strapdown inertial navigation system(SINS) transfer alignment carrier aircraft carrier moored.

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Effects of pitting corrosion on fatigue life of aluminum alloy Y12CZ based on initial discontinuity state

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中国有色金属学会会刊：英文版 2006年第A3期16卷 1319-1322页

作者：郁大照陈跃良胡家林杨茂胜 naval aeronautical Engineering academy Yantai 264001China qingdao Branch Naval Aeronautical Engineering AcademyQingdao 266041China

Based on initial discontinuity state (IDS) of material, a preliminary analytical model was presented to evaluate the effect of interaction of pitting corrosion and fatigue loading on the residual fatigue life of aluminum alloy LY12CZ. A life prediction was carried out using constant and variable amplitude loading for various pitting corrosion levels, and the prediction agreed reasonably with the available test data. The results suggest that the combination of a pit and IDS can be treated as the initial crack size. Pitting corrosion causes a significant decrease in fatigue lives with small corrosion depths. But the effect of pit on fatigue life is gradually reduced with increasing pit size. A pit with a constant depth can be applied to the model for long exposure structure. A preliminary recommendation for the pit depth is about 1 mm for LY12CZ. At last the effect of multiple-site corrosion damage (MSCD) on fatigue life was also studied, and the result shows that MSCD can decrease substantially fatigue life compared with that of a single crack.

关键词：铝合金疲劳分析金属腐蚀强度

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Flight mission modeling based on BDI Petri net

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Journal of Systems Engineering and Electronics 2017年第4期28卷 776-783页

作者： Yuanyuan Zhang Wenhai Wu qingdao Branch Naval Aeronautical Engineering Institute Qingdao 266041 China Navy Flight academy Huludao 125000 China

Goals reasoning and management of pilot is a key issue to monitor pilot's behavior and intention. Traditional modeling methods are based on scenarios or situations, such methods will cause the,covering problem due to redundancy and are incapable of depicting interactions among various goals and plans of pilot. Petri net integrated with belief, desire and intention (BDI) theory (BDI Petri net) is designed to solve this problem. Focusing on the BDI theory, goal states of agent are discussed firstly. Belief, desire and intention are modeled by places and transitions based on the Petri net theory. In order to simplify the network, colored token is introduced to depict various states of belief, and the hierarchy transition is applied to model the intention, together with tokens' flow derrionstrating the interaction among various goals and relationship among belief, desire and intention. A search and rescue mission is used to validate the proposed method and the result indicates that the model can be used to monitor goals and behaviors of pilots.

关键词： Petri net belief desire and intention (BDI) theory flight mission modeling agent

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Strategy dominance mechanism of autonomous collaboration in unmanned swarm within the framework of public goods game

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系统工程与电子技术:英文版 2023年第5期34卷 1252-1266页

作者： PAN Li WU Zhonghong YU Minggang LIU Jintao MEI Dan Weaponry Engineering College Naval University of EngineeringWuhan 430000China Electronics Engineering College Naval University of EngineeringWuhan 430000China Coastal Defense College Naval Aeronautical UniversityYantai 264001China qingdao campus Naval Aeronautical UniversityQingdao 266000China

The key advantage of unmanned swarm operation is its autonomous cooperation. How to improve the proportion of cooperators is one of the key issues of autonomous collaboration in unmanned swarm operations. This work proposes a strategy dominance mechanism of autonomous collaboration in unmanned swarm within the framework of public goods game. It starts with the requirement analysis of autonomous collaboration in unmanned swarm;and an aspiration-driven multiplayer evolutionary game model is established based on the requirement. Then the average abundance function and strategy dominance condition of the model are constructed by theoretical derivation. Furthermore, the evolutionary mechanism of parameter adjustment in swarm cooperation is revealed via simulation,and the influences of the multiplication factor r, aspiration levelα, threshold m and other parameters on the strategy dominance conditions were simulated for both linear and threshold public goods games(PGGs) to determine the strategy dominance characteristics;Finally, deliberate proposals are suggested to provide a meaningful exploration in the actual control of unmanned swarm cooperation.

关键词： unmanned combat swarm autonomous collabora-tion strategy dominance multi-player public goods game(PGG)

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Register Allocation Algorithm for High-Level Circuit Synthesis for Improved Testability

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Tsinghua Science and Technology 2008年第6期13卷 836-842页

作者：成本茂王红杨士元牛道恒靳洋 Department of Automation Tsinghua University qingdao Branch Naval Aeronautical Engineering Academy

Register allocation in high-level circuit synthesis is important not only for reducing area, delay, and power overheads, but also for improving the testability of the synthesized circuits. This paper presents an improved register allocation algorithm that improves the testability called weighted graph-based balanced register allocation for high-level circuit synthesis. The controllability and observability of the registers and the self-loop elimination are analyzed to form a weighted conflict graph, where the weight of the edge between two nodes denotes the tendency of the two variables to share the same register. Then the modified desaturation algorithm is used to dynamically modify the weights to obtain a final balanced register allocation which improves the testability of the synthesized circuits a higher fault coverage than other algorithms with Tests on some benchmarks show that the algorithm gives less area overhead and even less time delay.

关键词： high-level synthesis (HLS) register allocation testability weighted graph

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Initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments

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Chinese Journal of Aeronautics 2022年第1期35卷 277-289页

作者： Yangguang ZHANG Yueliang CHEN Yong ZHANG Guixue BIAN Chenguang WANG Andong WANG naval Aviation University qingdao campus Qingdao 266041China

The initial corrosion behavior and mechanism of 7B04 aluminum alloy under acid immersion and salt spray environments(pH=3.5)are studied by Scanning Electron Microscope(SEM),optical microscope,Fourier Transform Infrared Spectroscopy(FT-IR),X-Ray Diffraction(XRD),potentiodynamic polarization,Electrochemical Impedance Spectroscopy(EIS),and Scanning Kelvin Probe(SKP).The results show that pitting corrosion occurs at the initial corrosion stage,and the potential difference between the second phase particles is the main cause of *** pits on different locations gradually expand and coalesce with the proceeding of *** main components of corrosion products are Al_(2)O_(3),Al(OH)_(3),and AlCl_(3),and the generation rate of the corrosion product layer under the salt spray environment is larger than that under acid immersion *** both environments,the Volta potential distribution first disperses and then concentrates,while the charge transfer resistance first decreases and then increases with the corrosion *** Volta potential gradually shifts in a positive direction,indicating that corrosion products have an inhibitory effect on *** the same corrosion time,the corrosion product layer resistance and the expectation of the Volta potential of the salt spray sample are higher than those of the immersion ***,the corrosion current density for the salt spray sample is significantly lower than the immersion sample,which indicates that the thicker the corrosion product layer,the stronger the inhibition of corrosion reaction.

关键词： 7B04 aluminum alloy Acid salt spray Corrosion mechanism Corrosion products Electrochemistry Scanning Kelvin probe

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CT local reconstruction of solid rocket motor based on PI-POCS-TVM

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航空动力学报 2017年第2期32卷 470-476页

作者： LU Hong-yi CHEN Qing-gui ZHU Min LI Peng ZHAO Ru-yan WANG Bin Airborne Vehicle Engineering Department Naval Aeronautical and Astronautical University Yantai Shandong 264001 China qingdao Branch Naval Aeronautical and Astronautical University Qingdao Shandong 266041 China No. 7 Department Naval Aeronautical and Astronautical University Yantai Shanctong 264001 China

In order to test the defects of solid rocket motor(SRM)accurately and efficiently,the computed tomography(CT)inspection scheme for SRM's defects was investigated and a CT local reconstruction algorithm called prior information-projection onto convex sets-total variation minimization(PI-POCS-TVM)was *** SRM was first inspected by industrial CT(ICT)to generate a low-resolution SRM image used as the prior information,then high-resolution local inspection was carried out for SRM's *** validate the effectiveness of the CT inspection scheme for SRM's defects,one SRM was inspected by a narrow fan beam ICT *** back projection(FBP)algorithm,POCS,POCS-TVM and PI-POCS-TVM algorithms were applied to reconstruct CT *** performance of these algorithms was also *** demonstrated the effectiveness of the CT inspection scheme for SRM's ***,the PI-POCS-TVM algorithm has better local reconstruction image quality than the other three algorithms,showing great significance for accurate measurement of SRM's defects.

关键词： interior tomography exterior tomography compressed sensing prior information projection onto convex sets-total variation minimization(POCS-TVM) solid rocket motor

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Accelerated corrosion test and corrosion failure distribution model of aircraft structural aluminum alloy

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中国有色金属学会会刊：英文版 2006年第A3期16卷 1485-1488页

作者：柳文林穆志韬金平 Airborne Vehicle Engineering Naval Aeronautical Engineering AcademyYantai 264001China qingdao Branch Naval Aeronautical Engineering AcademyQingdao 266041China School of Aeronautics Science and Technology Beijing University of Aeronautics and AstronauticsBeijing 100081China

Based on corrosion damage data of 10 years for a type of aircraft aluminum alloy, the statistical analysis was conducted by Gumbel, Normal and two parameters Weibull distribution function. The results show that aluminum alloy structural member has the corrosion history of pitting corrosion—intergranular corrosion—exfoliation corrosion, and the maximum corrosion depth is in conformity to normal distribution. The accelerated corrosion test was carried out with the complied equivalent airport accelerated environment spectrum. The corrosion damage failure modes of aluminum alloy structural member indicate that the period of validity of the former protective coating is about 2.5 to 3 years, and that of the novel protective coating is about 4.0 to 4.5 years. The corrosion kinetics law of aluminum spar flange was established by fitting corrosion damage test data. The law indicates two apparent corrosion stages of high strength aluminum alloy section material: pitting corrosion and intergranular corrosion/exfoliation corrosion. The test results agree with the statistical fit result of corrosion data collected from corrosion member in service. The fractional error is 5.8% at the same calendar year. The accelerated corrosion test validates the corrosion kinetics law of aircraft aluminum alloy in service.

关键词：金属腐蚀微观结构损伤机制密度失效模型

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Corrosion damage evolution and residual strength of corroded aluminum alloys

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Journal of University of Science and Technology Beijing 2008年第4期15卷 430-433页

作者： Youhong Zhang Guozhi Lv Hui Wang Bomei Si Yueliang Cheng The Second Artillery Engineering College Xi＇an 710025 China School of Aeronautics Northwest Polytechnical University Xi＇an 710072 China naval aeronautical Engineering academy qingdao Branch Qingdao 266041 China

The LY12CZ aluminum alloy specimens were corroded under the conditions of different test temperatures and exposure durations. After corrosion exposure, fatigue tests were performed. Scanning electron microscopy and optical microscope analyses on corrosion damage were carried out. The definition of surface corrosion damage ratio was provided to describe the extent of surface corrosion damage. On the basis of the measured data sets of the corrosion damage ratio, the probabilistic model of corrosion damage evolution was built. The corrosion damage decreased the fatigue life by a factor of about 1.25 to 2.38 and the prediction method of residual strength of the corroded structure was presented.

关键词： aluminum alloy corrosion damage fatigue statistical analysis residual strength

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