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Evolution analysis of a UAV real-time operating system from a network perspective

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Chinese journal of Aeronautics 2019年第1期32卷 176-185页

作者： zheng zheng Guanping XIAO School of Automation Science and Electrical Engineering Beihang University

With the flourishing development of Unmanned Aerial Vehicles(UAVs), the mission tasks of UAVs have become more and more complex. Consequently, a Real-Time Operating System(RTOS) that provides operating environments for various mission services on these UAVs has become crucial, which leads to the necessity of having a deep understanding of an RTOS. In this paper, an empirical study is conducted on FreeRTOS, a commonly used RTOS for UAVs, from a complex network perspective. A total of 85 releases of FreeRTOS, from V2.4.2 to V10.0.0, are modeled as directed networks, in which the nodes represent functions and the edges denote function calls. It is found that the size of the FreeRTOS network has grown almost linearly with the evolution of the versions, while its main core has evolved steadily. In addition, a k-core analysis-based metric is proposed to identify major functionality changes of FreeRTOS during its *** result shows that the identified versions are consistent with the version change logs. Finally,it is found that the clustering coefficient of the Linux OS scheduler is larger than that of the FreeRTOS scheduler. In conclusion, the empirical results provide useful guidance for developers and users of UAV RTOSs.

关键词： Complex networks Evolution FreeRTOS k-core decomposition Real-time operating system

A novel direct reduction method to synthesize ordered Fe-pt alloy nanoparticles

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journal of Materials Science & Technology 2019年第4期35卷 560-567页

作者： Q.zheng Z.R.Zhang j.Du L.L.Lin W.X.Xia j.Zhang B.R.Bian j.p.Liu School of Materials and Chemical Engineering Ningbo University of Technology CAS Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology & EngineeringChinese Academy of Sciences Department of physics University of Texas at Arlington

In this work, a direct green solid-phase reduction method for the fabrication of large yield of ordered phase Fe-pt alloy nanoparticles was reported, in which inorganic salts were used as metal precursors and H_2-containing atmosphere was used as reducer. Utilizing this method, the composition and chemical ordered phase, such as L1_2-Fe_3 pt, L1_2-Fept_3, and L1_0-Fept phases can be easily achieved by one step reaction. The synthesized nanoparticles have clean surface because no organic precursors, no organic solutions or organic surfactants/ligands were used. Their magnetic performance and the formation mechanism of Fe-pt alloy nanoparticles were also investigated. This strategy can be applied to synthesize many other types of alloy nanoparticles with desired composition and necessary crystal structure, which can be used for a variety of practical applications, such as in magnetism and catalyst research fields.

关键词： Magnetic nanoparticles Fept Chemical synthesis

Characterization of Magnetron Sputter CN_(x) Thin Films

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Chinese physics Letters 1998年第2期15卷 120-122页

作者： zheng Wei-tao j.E.Sundgren Department of Materials Science Jilin UniversityChangchun 130023 Department of physics Linkoping UniversityS-58183 LinkopingSweden

Carbon nitride thin films were deposited at different substrate temperature(ST)by using reactive magnetron sputtering in a pure N_(2) discharge,and studied by laser Raman spectroscopy,x-ray photoelectron spectroscopy(XpS),and spectroscopic *** Raman spectra of the films show that I(D)/I(G)decreased with the increase of *** D bandposition shifted towards lower frequency,while the G bandposition shifted towards higher frequency as the ST *** XpS data exhibit that Nls binding states also depend on *** optical band gap of the films is found dropped from 0.22eV to 0.10eV with the increase of ST.

关键词： shifted films spectroscopic

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基于双目视觉技术的茶叶嫩芽定位方法研究

农机化研究 2025年第2期47卷 49-53页

作者：朱龙舜郑旻璐东南大学成贤学院南京210088 南京机电职业技术学院南京211306

进一步提升茶叶嫩芽定位的准确性及茶叶嫩芽采摘的作业效率,选取双目视觉技术作为切入点,针对其识别、定位、采摘等环节展开设计研究。考虑茶叶嫩芽采摘的基础特征和双目视觉技术的应用条件,合理搭建双目视觉模型,选用立体匹配的核心定... 详细信息

进一步提升茶叶嫩芽定位的准确性及茶叶嫩芽采摘的作业效率,选取双目视觉技术作为切入点,针对其识别、定位、采摘等环节展开设计研究。考虑茶叶嫩芽采摘的基础特征和双目视觉技术的应用条件,合理搭建双目视觉模型,选用立体匹配的核心定位算法,完成茶叶嫩芽的定位方法与采摘功能优化,并布置相应的试验机构,展开定位采摘验证试验。结果表明:基于双目视觉技术的茶叶嫩芽定位方法应用具有显著的优越性,较普通定位方法而言,识别误匹配率可降低至4.01%,平均漏采率为3.20%,嫩芽采摘完整率达93.40%,可以很好地促进茶叶嫩芽的后续处理加工,是采摘茶叶嫩芽的品质化的重要基础保障。

关键词：茶叶嫩芽定位双目视觉立体匹配采摘完整率品质化

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公众人工智能价值敏感性的测度解析

自然辩证法通讯 2025年第1期47卷 18-27页

作者：张学义周洲郑宇涵东南大学哲学与科学系江苏省道德发展智库

“价值敏感性”源于巴迪亚·弗里德曼的“价值敏感性设计”概念，指在技术设计、研发、生产和使用中具有伦理意蕴的价值感知能力。课题组创新性地应用“三方方法论”，通过多指标多因素结构方程模型(MIMIC)测量公众对人工智能的价值敏... 详细信息

“价值敏感性”源于巴迪亚·弗里德曼的“价值敏感性设计”概念，指在技术设计、研发、生产和使用中具有伦理意蕴的价值感知能力。课题组创新性地应用“三方方法论”，通过多指标多因素结构方程模型(MIMIC)测量公众对人工智能的价值敏感性，评估现有技术是否支持价值敏感设计目标。研究发现：(1)公众对人工智能的价值敏感排序为：透明性、算法公正、劳动就业保障、责任归属等，说明这些价值需在技术设计阶段予以重视；(2)信息安全和生态失衡未引起广泛关注；(3)性别和职业对价值敏感性无显著影响，但年龄和学历差异显著。

关键词：人工智能价值敏感性多指标多因素模型伦理治理

Sleep as a window to understand and regulate Alzheimer's disease:emerging roles of thalamic reticular nucleus

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Neural Regeneration Research 2025年第6期20卷 1711-1712页

作者： Haoqi Sun Shiqian Shen Robert j.Thomas M.Brandon Westover Can Zhang Department of Neurology Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Center for Translational pain Research Department of AnesthesiaCritical Care and Pain MedicineMassachusetis General HospitalHarvard Medical SchoolBostonMAUSA Division of pulmonary Critical Care and Sleep MedicineDepartment of MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Genetics and Aging Research Unit McCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolBostonMAUSA

Introduction:Alzheimer 's disease(AD) is a common neurodegenerative disorder and the primary cause of dementia. Considerable evidence supports the “amyloid hypothesis,” stating that the pathogenesis of AD is primarily caused by the deposition of amyloid-β(Aβ), which drives tau phosphorylation, neuroinflammation, and neurodegeneration in the brain. The amyloid hypothesis is strengthened by the significant and moderate benefit of lecanemab, a humanized antibody through an anti-amyloid mechanism,showing slowed clinical decline(van Dyck et al.,2023). The recent positive results of anti-amyloid trials have brought back focus on the amyloid hypothesis through biochemical, genetic, and pharmacological approaches(Zhang, 2023).

关键词： Alzheimer inflammation hypothesis

X-Ray properties of pSR j1811-1925 by Nu STAR

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Research in Astronomy and Astrophysics 2023年第11期23卷 51-59页

作者： jin-Tao zheng Ming-Yu Ge Xiang-Hua Li Department of Astronomy Yunnan UniversityKunming 650090China Key Laboratory for particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China

We analyzed the spectral properties and pulse profile of pSR j1811-1925,a pulsar located in the center of composite supernova remnant(SNR)G11.2-0.3,by using high timing resolution archival data from the Nuclear Spectroscopic Telescope Array Mission(NuSTAR).Analysis of archival Chandra data over different regions rules out the SNR shell as the site of the hard X-ray emission while spectral analysis indicates that the NuSTAR photons originate in the pulsar and its *** pulse profile exhibits a broad single peak up to 35 *** jointed spectrum by combining NuSTAR and Chandra can be well fitted by a power-law model with a photon index ofΓ=1.58±*** integrated flux of jointed spectrum over 1-10 keV is 3.36×10^(-12)erg cm^(-2)s^(-1).The spectrum of pulsar having photon indexΓ=1.33±0.06 and a 1-10 keV flux of 0.91×10^(-12)erg cm^(-2)s^(-1).We also performed the phase-resolved spectral analysis by splitting the whole pulse-on phase into five phase *** photon indices of the bins are all around 1.4,indicating that the photon index does not evolve with the phase.

关键词： (stars:)pulsars:individual(pSR j1811-1925) stars:neutron methods:data analysis

X-Ray and Radio Studies of the Candidate Millisecond pulsar Binary 4FGL j0935.3+0901

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Research in Astronomy and Astrophysics 2022年第2期22卷 128-134页

作者： Dong zheng Zhong-Xiang Wang Yi Xing jithesh Vadakkumthani Department of Astronomy School of Physics and AstronomyYunnan UniversityKunming 650091China Key Laboratory of Astroparticle physics of Yunnan province Yunnan UniversityKunming 650091China Shanghai Astronomical Observatory Chinese Academy of Sciences80 Nandan RoadShanghai 200030China Inter-University Centre for Astronomy and Astrophysics PB No.4GaneshkhindPune-411007India Department of physics University of CalicutMalappuram-673635KeralaIndia

4 FGL j0935.5+0901, a γ-ray source recently identified as a candidate redback-type millisecond pulsar(MSp)binary, shows an interesting feature of having double-peaked emission lines in its optical spectrum. This feature would further suggest the source is a transitional MSp system in the sub-luminous disk state. We have observed the source with XMM-Newton and Five-hundred-meter Aperture Spherical radio Telescope(FAST) at X-ray and radio frequencies respectively for further studies. From the X-ray observation, a bimodal count-rate distribution, which is a distinctive feature of the transitional MSp systems, is not detected, but the properties of X-ray variability and power-law spectrum are determined for the source. These results help establish the consistency of it being a redback in the radio pulsar state. However no radio pulsation signals are found in the FAST observation, resulting in an upper limit on the flux density of ~4 μjy. Implications of these results are discussed.

关键词： (stars:)binaries(including multiple):close (stars:)pulsars:general gamma-rays:stars

NECAB family of neuronal calcium-binding proteins in health and disease

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Neural Regeneration Research 2025年第5期20卷 1236-1243页

作者： Diones Bueno Michael K.E.Schafer Sudena Wang Michael j.Schmeisser Axel Methner Institute for Molecular Medicine University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Department of Anesthesiology University Medical Center of the Johannes Gutenberg-UniversityMainzGermany Institute of Anatomy University Medical Center of the Johannes Gutenberg-UniversityMainzGermany

The N-terminal EF-hand calcium-binding proteins 1–3(NECAB1–3) constitute a family of predominantly neuronal proteins characterized by the presence of at least one EF-hand calcium-binding domain and a functionally less well characterized C-terminal antibiotic biosynthesis monooxygenase domain. All three family members were initially discovered due to their interactions with other proteins. NECAB1 associates with synaptotagmin-1, a critical neuronal protein involved in membrane trafficking and synaptic vesicle exocytosis. NECAB2 interacts with predominantly striatal G-protein-coupled receptors, while NECAB3 partners with amyloid-β A4 precursor protein-binding family A members 2 and 3, key regulators of amyloid-β production. This demonstrates the capacity of the family for interactions with various classes of proteins. NECAB proteins exhibit distinct subcellular localizations: NECAB1 is found in the nucleus and cytosol, NECAB2 resides in endosomes and the plasma membrane, and NECAB3 is present in the endoplasmic reticulum and Golgi apparatus. The antibiotic biosynthesis monooxygenase domain, an evolutionarily ancient component, is akin to atypical heme oxygenases in prokaryotes but is not wellcharacterized in vertebrates. prokaryotic antibiotic biosynthesis monooxygenase domains typically form dimers, suggesting that calcium-mediated conformational changes in NECAB proteins may induce antibiotic biosynthesis monooxygenase domain dimerization, potentially activating some enzymatic properties. However, the substrate for this enzymatic activity remains uncertain. Alternatively, calcium-mediated conformational changes might influence protein interactions or the subcellular localization of NECAB proteins by controlling the availability of protein–protein interaction domains situated between the EF hands and the antibiotic biosynthesis monooxygenase domain. This review summarizes what is known about genomic organization, tissue expression, intracellular localization, interac

关键词： calcium EF hand mitochondria nervous system signal transduction