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A review of addressing class noise problems of remote sensing classification

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Journal of Systems Engineering and Electronics 2023年第1期34卷 36-46页

作者： feng Wei LONG Yijun WANG Shuo quan Yinghui School of Electronic Engineering Xidian UniversityXi’an 710071China Xi’an Key Laboratory of Advanced Remote Sensing Xi’an 710071China Key Laboratory of Collaborative Intelligence Systems Ministry of EducationXidian UniversityXi’an 710071China

The development of image classification is one of the most important research topics in remote sensing. The prediction accuracy depends not only on the appropriate choice of the machine learning method but also on the quality of the training datasets. However, real-world data is not perfect and often suffers from noise. This paper gives an overview of noise filtering methods. Firstly, the types of noise and the consequences of class noise on machine learning are presented. Secondly, class noise handling methods at both the data level and the algorithm level are introduced. Then ensemble-based class noise handling methods including class noise removal, correction, and noise robust ensemble learners are presented. Finally, a summary of existing data-cleaning techniques is given.

关键词： class noise label noise mislabeled classification ensemble learning remote sensing

Synthesis, Crystal Structure and Catalytic Properties of a Novel Ni(Ⅱ) MOF with a Rare [3+3+3] Nine Fold Interpenetrated Network

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Chinese Journal of Structural Chemistry 2020年第8期39卷 1489-1495,1360页

作者： guo feng Chongqing Key Laboratory of Inorganic Special Functional Materials College of Chemistry and Chemical EngineeringYangtze Normal UniversityFulingChongqing 408100China

Metal-organic frameworks are a sort of rapid development crystal solids,which have greatly attracted a large amount of attention in recent *** construction of 3D[Ni(bcp)(bpp)]n(namely complex 1)displays a rare[3+3+3]nine-fold interpenetrated diamond topology,which can be successfully synthesized by a mixed strategy of 1,3-bis(4-carboxyphenoxy)propane(H2bcp)and 1,4-bis(4-pyridylmethyl)piperazine(bpp).The interpenetrated network may be ascribed to these flexible bridging linkers to facilitate the penetration *** addition,the resultant sample was adequately characterized by elemental analysis,single-crystal X-ray diffraction,powder X-ray diffraction,and thermal gravimetric ***,the as-synthesized sample can be used as catalysis for chemical fixation of CO2 and epoxide to carbonate.

关键词： Ni(Ⅱ)-organic framework interpenetrated structure CO2 catalysis

3D printing of architectured graphene-based aerogels by cross-linking GO inks with adjustable viscoelasticity for energy storage devices

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Rare Metals 2023年第3期42卷 971-981页

作者： San-Can Han Jia-Le quan Fu-guo Zhou Yu-Hua Xue Na Li feng-Yu Li Ding Wang School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China

Three-dimensional(3D)functional graphenebased architecture with superior electrical conductivity and good mechanical strength has promising applications in energy storage and ***-adjustable inks make it possible to achieve desired 3D architectures with interconnected and continuous interior networks by microextrusion *** this work,ultra-low-concentration graphene oxide(GO)inks of~15 mg·ml-1 have been obtained and demonstrated in direct 3D printing with a facile cross-linking(direct ink writing).The rheological behavior of the GO strategy by cations,which is the lowest concentration to achieve direct ink writing inks,could be adjusted from 1×10^(4) to 1×10^(5) Pa·s^(-1) with different concentrations of cations due to strong cross-linking networks between GO sheets and ***,the specific strength and electrical conductivity of 3D-printed graphene architecture are notably enhanced,reaching up to 51.7×10^(3) N·m·kg^(-1)and 119 S·m^(-1),which are superior to conventional graphene ***,3D printing graphene-based architecture assembled in micro-superc apacitor exhibits excellent electrochemical performance,which can be ascribed to the effective ion transportation through the interconnected *** strategy demonstrated is useful in the design of complex-shaped,graphene-based architectures for scalable manufacturing of practical energy storage applications.

关键词： Three-dimensional(3D)printing Graphene oxide(GO)inks Cross-linking strategy Graphene-based architecture

Design of a Servo Mechanical Press with Redundant Actuation

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Chinese Journal of Mechanical Engineering 2009年第4期22卷 574-579页

作者： guo Weizhong GAO feng State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai 200240 China

A servo press is a new type of mechanical press that is driven by programmable motors and offers superior performance such as low noise, excellent efficiency and high precision for metal forming operations. Similar to multi-link mechanical presses, a servo mechanical press tends to grow in size as the tonnage increases that calls for larger, heavy duty servo motors, which could be expensive and may not even be available. In this paper, a new concept of servo mechanical press with redundant actuation is proposed firstly using two servo motors driving one input shaft, i.e. one-point-two-motor mode that makes it possible to produce a larger press with available servomotors. Then the punching mechanism design is detailed. The performance indices are set up including mechanical advantage reciprocal and link force ratios. A bounded feasible solution space is constructed for dimensional synthesis based on non-dimensional link lengths and assembly conditions. The performance atlases are depicted over the bounded feasible solution space that lead to a visual solution of the punching mechanism with global optimization. Finally, case studies are given to illustrate the design method with visual global optimization, and a prototype with 200 t punching force is being developed in our laboratory to demonstrate efficacy of the new concept for servo mechanical press. The presented research provides a feasible solution to the development of heavy-duty servo mechanical presses and finds potential applications in the development of other types of heavy equipments with electric drive.

关键词： servo mechanical press redundant actuation mechanism design visual global optimization prototype

Infinite Horizon Forward-Backward Doubly Stochastic Differential Equations and Related SPDEs

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Acta Mathematicae Applicatae Sinica 2021年第2期37卷 319-336页

作者： Qing-feng ZHU Liang-quan ZHANG Yu-feng SHI School of Mathematics and quantitative Economics Shandong University of Finance and EconomicsandShandong Key Laboratory of Blockchain FinanceJinan 250014China Institute for Financial Studies and School of Mathematics Shandong UniversityJinanChina School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

A type of infinite horizon forward-backward doubly stochastic differential equations is *** some monotonicity assumptions,the existence and uniqueness results for measurable solutions are established by means of homotopy method.A probabilistic interpretation for solutions to a class of stochastic partial differential equations combined with algebra equations is given.A significant feature of this result is that the forward component of the FBDSDEs is coupled with the backward variable.

关键词： infinite horizon forward-backward doubly stochastic differential equations homotopy stochastic partial differential equation

A randomized, open-label, multicentre study to evaluate plasma atherosclerotic biomarkers in patients with type 2 diabetes mellitus and arteriosclerosis obliterans when treated with Probucol and Cilostazol

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Journal of Geriatric Cardiology 2012年第3期9卷 228-236页

作者： Xiao-Wei Ma Xiao-Hui guo Xin-Hua Xiao Li-Xin guo Xiao-feng Lv quan-Min Li Yan Gao Department of Endocrinology Peking University First Hospital No. 7 of Xishiku Street Xicheng District Beijing 100034 China Department of Endocrinology Peking Union Medical College Hospital No.1 Shuaifuyuan Dongcheng District Beijing 100005 China Department of Endocrinology Peking Hospital No. 1 Dahua Road Dongdan Dongcheng District Beijing 100730 China Department of Endocrinology Military General Hospital of Peking PLA No.5 Nanmencang Dongsishitiao Dongcheng District Beifing 100070 China Department of Endocrinology Second Artillery Forces General Hospital of Peking PLA No.16 Xinjiekouwai Street Xicheng District Beijing 100088 China

Objectives To evaluate the plasma atherosclerotic biomarkers in patients with type 2 diabetes mellitus （T2DM） and arteriosclerosis obliteran （ASO） when treated with Probucol plus Cilostazol in combination and individually. Methods In this open-label study, patients aged 40-75 years were randomized to receive conventional therapy alone, or with Cilostazol 100 mg bid, or with Probucol 250 mg bid, or with both in combination. Endpoints included changes in plasma biomarker and safety at 12 weeks. Results Of the 200 randomized pati- ents, 165 for per-protocol and 160 for the safety （QTc intervals） were set, respectively. Probucol significantly reduced total cholesterol （P 〈 0.001）, low-density lipoprotein cholesterol （LDL-C）, （P = 0.01）, and high-density lipoprotein cholesterol （HDL-C）（P 〈 0.001） compared with conventional therapy. Cilostazol was effective in increasing HDL-C （P = 0.002） and reducing triglycerides levels （P 〈 0.01） compared with conventional therapy. A trend towards significance was observed for the difference between conventional therapy alone and Probucol plus Cilostazol group for the change in oxidized low-density lipoprotein （Ox-LDL, P = 0.065）. No significant effects on the majority of the remaining biomarkers were found across the treatment groups. Conclusions We have confirmed that Ox-LDL could be a possible plasma atherosclerotic biomarker among the evaluated biomarkers, which reflected the synergetic effect of Cilostazol plus Probucol in patients with T2DM and ASO shown previously in preclinical studies.

关键词： Cilostazol Probucol Combination treatment Atherosclerosis Biomarkers Synergetic effect

Distribution of static equilibrium points in static electric field produced by fixed electrons

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The Journal of China Universities of Posts and Telecommunications 2014年第4期21卷 92-95页

作者： guo feng School of Science China University Mining & Technology(Beijing)

Fix n electrons on the disk ｜z｜≤R. They generate a static electric field. Let a be an electron located in the disk ｜z｜≤R sin π/n. It shows that the closed disk with center a and radius R contains at least one s... 详细信息

关键词： fixed electrons static electric field static equilibrium points

Regularity Criteria of Axisymmetric Weak Solutions to the 3D Magnetohydrodynamic Equations

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 289-302页

作者： Bao-quan YUAN feng-ping LI School of Mathematics and Information Science Henan Polytechnic University

In this paper, we study the regularity criteria for axisymmetric weak solutions to the MHD equa- tions in R3. Let we, Jo and ue be the azimuthal component of w, J and u in the cylindrical coordinates, respectively. Then the axisymmetric weak solution （u,b） is regular on （0, T） if （wo,Jo） E Lq（O,T;Lp） or （oae,V（uoeo）） e Lq（0,T;Lp） with 3 ＋ 2 〈 2, 3 〈 p 〈 oo. In the endpoint case, one needs conditions （we, Jo） C LI（0, T;B∞∞） or （wo, V（uoeo）） C LI（0, T;B ∞∞）.

关键词： regularity criteria axisymmetric solutions Besov space

Normality of Tetravalent Cayley Graphs of Odd Prime-cube Order and Its Application

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Acta Mathematica Sinica,English Series 2005年第4期21卷 903-912页

作者： Yan quan feng Ming Yao XU Department of Mathematics Beijing Jiaotong University Beijing 100044 P. R. China LMAM Institute of Mathematics Peking University Beijing 100871 P. R. China

Let p be an odd prime. In this paper we prove that all tetravalent connected Cayley graphs of order p^3 are normal. As an application, a classification of tetravalent symmetric graphs of odd prime-cube order is given.

关键词： Cayley graph Normal Cayley graph Symmetric graph