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Structural diversity for decision tree ensemble learning

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Frontiers of Computer Science 2018年第3期12卷 560-570页

作者： Tao sun Zhi-hua ZHOU National Key Laboratory for Novel Software Technology Nanjing University Nanjing 210023 China

Decision trees are a kind of off-the-shelf predictive models, and they have been successfully used as the base learners in ensemble learning. To construct a strong classi- fier ensemble, the individual classifiers should be accurate and diverse. However, diversity measure remains a mystery although there were many attempts. We conjecture that a deficiency of previous diversity measures lies in the fact that they consider only behavioral diversity, i.e., how the classifiers behave when making predictions, neglecting the fact that classifiers may be potentially different even when they make the same predictions. Based on this recognition, in this paper, we advocate to consider structural diversity in addition to behavioral diversity, and propose the TMD （tree matching diversity） measure for decision trees. To investigate the usefulness of TMD, we empirically evaluate performances of selective ensemble approaches with decision forests by incorporating different diversity measures. Our results validate that by considering structural and behavioral diversities together, stronger ensembles can be constructed. This may raise a new direction to design better diversity measures and ensemble methods.

关键词： ensemble learning structural diversity decisiontree

Experimental and numerical investigation on the gas leakage regime for ventilated tail cavity of an underwater vehicle

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Journal of Hydrodynamics 2023年第1期35卷 46-60页

作者： xiao-bo Quan Shao-hua Cheng College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China China Academy of Launch Vehicle Technology Beijing100076China Beijing Institute of Astronautical Systems Engineering Beijing100076China

The objective of this paper is mainly to investigate the ventilated tail cavity flow of an underwater vehicle with focus on the gas leakage regime by experimental and numerical methods.A high-speed camera and pressure measurement system are used to record the cavity flow patterns and pressure behavior,*** numerical simulation is carried out with volume of fluid(VOF)model and Filter-based turbulence model(FBM).Good agreement can be obtained between the experimental and numerical *** are three gas leakage types in the evolution of the intact tail cavity,i.e.,twin-vortex tube entrainment(TVTE),toroidal vortex shedding(TVS)and hybrid twin-vortex tube entrainment and toroidal vortex shedding(TVTE-TVS).With the increase of Fr,the unsteady behavior of the cavity with different gas leakage types becomes more *** internal flow characteristics revealed three distinct regions including the ventilation influence region,the reverse flow region and the high shear flow region and have an important effect on the transition of gas leakage regime.

关键词： Ventilated tail cavity gas leakage regime unsteady behavior internal flow characteristics

经皮耳穴迷走神经刺激联合多模式镇痛对全膝关节置换术后患者康复的临床研究

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中国疗养医学 2025年第1期34卷 22-26页

作者：陈小花颜妍江西中医药大学附属医院急诊科江西南昌330006 江西中医药大学附属医院护理部江西南昌330006

目的探讨经皮耳穴迷走神经刺激联合多模式镇痛对全膝关节置换术后患者的康复效果。方法由相同手术团队对66例膝骨关节炎患者实施全膝关节置换术,采用随机数字表分为两组,对照组予多模式镇痛方案,研究组加用经皮耳穴迷走神经刺激,评价数... 详细信息

目的探讨经皮耳穴迷走神经刺激联合多模式镇痛对全膝关节置换术后患者的康复效果。方法由相同手术团队对66例膝骨关节炎患者实施全膝关节置换术,采用随机数字表分为两组,对照组予多模式镇痛方案,研究组加用经皮耳穴迷走神经刺激,评价数字等级量表(NRS)评分、痛阈值和焦虑自评量表(SAS)评分,记录并发症和不良事件。结果两组术后1 d NRS评分差异无统计学意义,两组在术后7 d和14 d均有明显改善,研究组NRS术后7 d(2.63±0.78)分、术后14 d(1.25±0.64)分,明显低于对照组NRS术后7 d(3.88±0.83)分、术后14 d(2.73±0.65)分,差异有统计学意义(P<0.05);两组痛阈值在术后7、14 d均改善,研究组优于对照组(P<0.05),两组术后3、7、14 d的SAS评分均有所改善,研究组显著低于对照组,差异有统计学意义(P<0.05);两组并发症和不良事件发生率差异无统计学意义,安全性较佳。结论经皮耳穴迷走神经刺激联合多模式镇痛对全膝关节置换术后患者康复效果显著,能够发挥协同增效作用,安全性佳,对膝骨关节炎术后康复有临床指导价值。

关键词：经皮耳穴迷走神经刺激全膝关节置换术术后康复应用研究

The Zuo Jin Wan Formula increases chemosensitivity of human primary gastric cancer cells by AKT mediated mitochondrial translocation of cofilin-1

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Chinese Journal of Natural Medicines 2019年第3期17卷 198-208页

作者： sun Meng-Yao WANG Dan-Dan sun Jian ZHAO xiao-hua CAI Si WU Qiu-Xue JIE Tao NI Zhen-hua sun Jian-Yue TANG Qing-Feng Department of Clinical Laboratory and Central Laboratory Putuo Hospital Shanghai University of Traditional Chinese Medicine Institute of Interdisciplinary Medical Sciences Shanghai University of Traditional Chinese Medicine Department of Clinical Laboratory Shuguang Hospital Shanghai University of Traditional Chinese Medicine Department of Pediatrics Putuo Hospital Shanghai University of Traditional Chinese Medicine

Resistance to cisplatin(DDP)-based chemotherapy is a major cause of treatment failure in human gastric cancer(GC). It is necessary to identify the drugs to re-sensitize GC cells to DDP. In our previous research, Zuo Jin Wan Formula(ZJW) has been proved could increase the mitochondrial apoptosis via cofilin-1 in a immortalized cell line, SGC-7901/DDP. Due to the immortalized cells may still difficult highly recapitulate the important molecular events in vivo, primary GC cells model derived from clinical patient was constructed in the present study to further evaluate the effect of ZJW and the underlying molecular mechanism. Immunofluorescent staining was used to indentify primary cultured human GC cells. Western blotting was carried out to detect the protein expression. Cell Counting Kit-8(CCK-8) was used to evaluate cell proliferation. Flow cytometry analysis was performed to assess cell apoptosis. ZJW inhibited proliferation and induced apoptosis in primary DDP-resistant GC cells. Notably, the apoptosis in GC cells was mediated by inducing cofilin-1 mitochondrial translocation, down-regulating Bcl-2 and up-regulating Bax expression. Surprisingly, the level of p-AKT protein was higher in DDP-resistant GC cells than that of the DDP-sensitive GC cells, and the activation of AKT could attenuate ZJW-induced sensitivity to DDP. These data revealed that ZJW can increase the chemosensitivity in DDP-resistant primary GC cells by inducing mitochondrial apoptosis and AKT inactivation. The combining chemotherapy with ZJW may be an effective therapeutic strategy for GC chemoresistance patients.

关键词： Primary GC cells ZJW AKT Chemoresistance

Cerium-yttrium binary oxide microflower:synthesis,characterization and catalytic dehydration property

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Rare Metals 2021年第7期40卷 1785-1800页

作者： Cheng Pan Ben-hua huang Chao Fan xiao-Yong Li Pei-Gen Su A-Qun Zheng Yang sun Department of Applied Chemistry School of ScienceXi’an Jiaotong UniversityXi’an 710049China

Cerium dioxide has a comparatively lower Ce4+/Ce3+redox pair,which leaves abundant oxygen vacancies on oxide lattice,also making incorporation of foreign ion and subsequent applications feasible and *** this work,a series of cerium-yttrium mixed oxides were prepared by using polyvinylpyrrolidone as major template through sol-gel,which were further employed as catalyst for dehydration of aniline with formic acid into *** reveal that synthetic samples have a variety of morphologies including nanoparticle,microflower,and uniform *** monitoring of particle size,zeta potential,and ultravioletvisible(UV-Vis)of preparative solution indicate that selfassembly of polyvinylpyrrolidone and its subsequent reaction with metal ion determines sample *** catalytic dehydration,all samples show high dehydration efficiencies that are comparable to those from anhydrous Na2SO4 and combination of dicyclohexylcarbodiimide with 4-dimethylaminopyridine and dichloromethane shows better outputs than *** association with structural analysis,cerium looks more active than yttrium,while yttrium mainly plays as a structure-directing and *** micro-/nanofabrication of rare earth composites and their catalytic applications.

关键词： Cerium-yttrium binary oxide Microflower Morphology Formation monitoring Catalytic dehydration

Role of bonding filling on HER/OER/ORR multifunctional catalytic activity in transition-metals-doped PdPX(X=S,Se,Te)

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Rare Metals 2024年第10期43卷 5126-5140页

作者： Hai-hua huang Wei Li Cheng-Chao Hu Xue-Qin sun Lin-Guo Lu xiao-Feng Fan School of Materials Science and Engineering Laboratory of Sensitive Materials and DevicesShandong Department of EducationLiaocheng UniversityLiaocheng 252059China School of Environmental and Material Engineering Yantai UniversityYantai 264005China Department of Physics University of Puerto RicoRio PiedrasSan Juan.PR00931USA Key Laboratory of Automobile Materials(Jilin University) Ministry of EducationCollege of Materials Science and EngineeringJilin UniversityChangchun 130012China

The development of stable and highly efficien multifunctional electrocatalysts for the hydrogen evolution reaction(HER),oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)are essential for the efficient conversion and storage of renewable *** significant advantages of single-atom catalysts,such as strong metal slab interactions,unsaturated coordination and efficient atomic utilization,have opened new avenues for designing multifunctional ***,based on density functional theory,a single atom doped PdPX system was designed as a multifunctional electrocatalyst,which demonstrated the synergistic effect between defects and transition metal atoms and led to enhanced catalytic *** results showed that PdPS/PdPSe with P/X vacancy,PdPTe with P/Pd vacancy and Co/Rh/Ir@PdPX exhibited promising HER ***@PdPS(Se),with an overpotential of 0.56(0.44)V,was predicted to be a promising OER ***,Rh(Ir)@PdPS(Se)catalysts exhibited efficient catalytic properties for ORR Besides,Co@PdPS(Se),Rh(Ir)@PdPS~(V(S)),Co@PdP-Se~(V(Se))and Ir@PdPS~(V(S)-1)exihibited multifunctional catalytic performance with moderate ***,the origin of catalytic activity was revealed by using the crystal orbital Hamilton populations *** a strong adsorption system,proper filling of the anti-bonding state can increase the energy of the system,weaken the adsorption strength,and facilitate the desorption of intermediates Conversely,augmenting bonding states can enhance its adsorption *** findings provide theoretica guidance for the design and fabrication of novel multifunctional electrocatalysts in terms of filling of bondingstate.

关键词： Electrocatalyst Two-dimensional PdPX Water splitting Density functional theory

Study on Hydrodynamic Characteristics of Wave Turbulent Bottom Boundary Layer Using A Large-Sized Wave Flume

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China Ocean Engineering 2021年第5期35卷 759-766页

作者： ZHANG Hong-qian XIE Ming-xiao ZHANG Chi LI Shao-wu ZHANG hua-qing sun Yu-chen State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Tianjin Research Institute for Water Transport Engineering M.O.T..Tianjin 300456China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China

Experimental studies were conducted in a super-large wave flume,aiming at uncovering the hydrodynamic characteristics involved in the turbulent wave boundary layer of full scale *** explicit formula of boundary layer thickness on rough turbulent flow was presented based on the measured velocity data of the present study and collected experimental data on wave boundary *** was found that the bottom wave-associated nominal stresses under the conditions of prototype scale tests suppress the vertical turbulence scattering upward over the boundary layer,which accounts for thickening of the boundary layer under wave *** effect has yet not been reported in the literatures using oscillatory U-tube or small-sized wave *** phase inconsistency in the turbulent boundary layer to the free stream velocity(velocity immediately outside the boundary layer)is within15°,which is remarkably smaller than the results from oscillatory U-tubes,as well as the larger wave flume experiment presented by Xie et al.(2021),showing that the coarser bed would further reduce the phase *** intensity of the vertical turbulent component is approximately 1/2 of the horizontal component,which has larger ratio compared with the value of 1/5 reported by previous ***,it was also found that the vertical turbulent energy was approximately 3/4 of the turbulent energy in spanwise directions(y-direction).This means that the turbulent fluctuation has similar order in all three-directions(x,y,z)in a full scale environment and highlights that the turbulent components in all the three directions should not be neglected when calculating the total turbulent energy.

关键词： large wave flume wave boundary layer hydrodynamic mechanism turbulent

An equivalent form of the Navier-Stokes equations

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Acta Mechanica Sinica 2023年第2期39卷 165-166页

作者： Bo-hua sun School of Civil Engineering&Institute of Mechanics and Technology Xi'an University of Architecture and TechnologyXi'an 710055China

The Navier-Stokes equations of incompressible flow can be expressed as follows[1-8]:■v/■t+■·■u=-1/ρ■ρ+v■^(2)v,(1)■·v=0(2)Equation(1)is the momentums equation and Eq.(2)is the mass conservation equation.

关键词： equation. Navier equations

Scattering Resonance States and Partial Potential Energy Surface of Reaction I+HI(v=0)→IH(v′=0) +I

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Chemical Research in Chinese Universities 2005年第5期21卷 569-572页

作者： sun xiao-min WANG hua-yang CAI Zheng-ting FENG Da-cheng BIAN Wen-sheng Institute of Theoretical Chemistry Shandong University Jinan 250100 P. R. China State Key Laboratory of Molecular Dynamics Institute of ChemistryChinese Academy of Scienees Beijing 100080 P. R. China

The partial potential energy surface of the I ＋ HI →IH ＋ I reaction involving the translational and vibrational motions has been constructed at the QCISD（ T ）//MP4SDQ level with the pseudo potential method that is helpful to interpreting the scattering resonance states. The lifetimes of the scattering resonance states in the title reaction obtained from the partial potential energy surface are about 90-120 fs, which agrees with the result of high-resolved threshold photodetachment spectroscopy of anion IHI^- measured by Neumark.

关键词： Partial potential energy surface Reaction pathway Dynamic Eyring Lake Scattering resonance state,Lifetime of resonance