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A self-optimizing QoS-aware service composition approach in a context sensitive environment

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第3期12卷 221-238页

作者： Yuan-hong shen Xiao-hu YANG School of Computer Science and Technology Zhejiang University Hangzhou 310027 China

QoS-aware service composition is aimed to maximize the global QoS of a composite service when selecting candidate *** a context sensitive service execution environment in pervasive computing,the context information for service composition is not static:device,policy,and user constraints,and QoS requirements may change,new services may be deployed,old ones withdrawn,or existing ones change their QoS *** results in the current service composition plan failing or its QoS degrading from the *** this paper,a runtime self-optimizing service composition framework is *** implementation of a prototype for this framework is presented,addressing the issues of reducing extra delay while increasing global QoS in service composition in a dynamic context *** service re-plan algorithms are compared that can be used in dynamic context environment,i.e.,minimal-conflict hill-climbing repair genetic algorithm(MCHC-repair GA),an improved penalty-based GA,and our multi-population conflicts sorted repair genetic algorithm(MP-CS-repair GA),as well as three kinds of service composition mechanisms-with backup,without backup,and our context-aware service re-selection *** results show that our MP-CS-repair GA and context-aware service re-selection method can reduce more extra delay while acquiring a higher global QoS for the composite service in a context sensitive *** context-aware service re-selection mechanism also shows some adaptability to different context change frequencies and user requirements for reducing computation cost in the self-optimizing process.

关键词： Service composition Quality of service(QoS) Context Repair genetic algorithm Self-optimizing

Dramatic sediment load changes and sedimentation characteristics upstream of the Three Gorges Dam due to the large reservoirs construction

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Frontiers of Earth Science 2024年第3期18卷 565-578页

作者： Jie LIU Wenwu ZHANG Ying shen xin WANG National Inland Waterway Regulation Engineering Research Center Chongqing Jiaotong UniversityChongqing 400074China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of River&Ocean Engineering Chongqing Jiaotong UniversityChongqing 400074China Tianjin Research Institute for Water Transport Engineering Tianjin 300456China

After the construction of cascade reservoirs in the upper reaches of the Three Gorges Reservoir(TGR),the sediment load outflow of the upper Yangtze River Basin(YRB)has been significantly altered,decreasing from 491.8 Mt/yr(1956–2002)to 36.1 Mt/yr(2003–2017)at Yichang *** has widely affected river hydrology,suspended sediment grain size distribution,and channel *** study analyzed hydrological variations in water discharge and sediment load of the upper YRB over the past 62 years(1956–2017)by employing a double mass *** variations in the source areas of sediment yielding for the upper YRB were quantified,and field measurement data of the cross-channel profile were collected to investigate the sedimentation process in the TGR from 2003 to *** than 90%of the sediment load reduction in the upper YRB may be explained by human *** Jinshajiang River was no longer the largest sediment source area for the Zhutuo station(accounting for 5.23%)in the 2013–2017 time span,and the sediment rating rates for the inflow and outflow of the TGR shifted to negatively correlated.A longitudinal fining trend was revealed in the suspended sediment ***,the mean median grain size of suspended sediment in the TGR had an increasing trend in the 2013–2017 *** result may be closely related to sediment regulation in reservoirs and incoming sediment load *** in the TGR decreased sharply from 299.8 Mt/yr in 2003–2012 to 47.2 Mt/yr in 2013–2017,but the sedimentation rate of the TGR remained at>80%***,some cross sections in the fluctuating backwater zone experienced scouring.

关键词： cascade reservoirs sediment load sedimentation characteristics suspended sediment grain size Three Gorges Reservoir

Curcumin Prevents Induced Drug Resistance:A Novel Function?

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Chinese Journal of Cancer Research 2011年第3期23卷 218-223页

作者： Dong Xu Wei Tian hong shen Department of Surgical Oncology Hangzhou 310009China Department of Medical Oncology Second Affiliated HospitalZhejiang University College of MedicineHangzhou 310009China

Objective：We supposed that it will be a promising strategy to ＂prevent＂ multidrug resistance （MDR） instead of ＂reversing＂ *** study was designed to investigate the potency of curcumin to prevent the acquired drug resistance induced by adriamycin （ADM） in native K562 ***：K562 cells were pretreated with curcumin or 0.5% DMSO for 24 h and then were co-incubated with ADM.P-glycoprotein （P-gp） and mdr1 mRNA levels were analyzed separately by flow cytometry and quantitative real-time *** intracellular Rh-123 accumulation was also detected by flow ***,we performed a MTT assay to determine the ADM-induced cytotoxicity with or without pretreatment of ***：P-gp and mdr1 mRNA expressions were elevated in the ADM alone *** in the curcumin pretreated groups,the induced P-gp and mdr1 mRNA levels gradually decreased with increasing curcumin concentrations,and the Rh-123 accumulation level was almost recovered close to the control group＇***,the MTT colorimetric assay verified the enhanced effect of curcumin on ADM-induced ***：Our present study suggested that curcumin exhibits the novel ability to prevent the up-regulation of P-gp and its mRNA induced by *** prevention capacity is also functionally associated with the elevated intracellular drug accumulation and parallel enhanced ADM *** revealed a novel function of curcumin as a potential drug resistance preventor.

关键词： Curcumin Drug resistance P-glycoprotein K562 cell

Ground-based/UAV-LiDAR data fusion for quantitative structure modeling and tree parameter retrieval in subtropical planted forest

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Forest Ecosystems 2022年第5期9卷 674-691页

作者： Reda Fekry Wei Yao Lin Cao xin shen Department of Land Surveying and Geo-informatics The Hong Kong Polytechnic UniversityHung HomHong KongChina The hong Kong Polytechnic University shenzhen Research Institute ShenzhenChina Co-Innovation Center for Sustainable Forestry Nanjing Forestry UniversityNanjing210037China

Light detection and ranging(LiDAR)has contributed immensely to forest mapping and 3D tree *** the perspective of data acquisition,the integration of LiDAR data from different platforms would enrich forest information at the tree and plot *** research develops a general framework to integrate ground-based and UAV-LiDAR(ULS)data to better estimate tree parameters based on quantitative structure modelling(QSM).This is accomplished in three sequential ***,the ground-based/ULS LiDAR data were co-registered based on the local density peaks of the clustered ***,redundancy and noise were removed for the ground-based/ULS LiDAR data ***,tree modeling and biophysical parameter retrieval were based on *** were performed for Backpack/Handheld/UAV-based multi-platform mobile LiDAR data of a subtropical forest,including poplar and dawn redwood ***,ground-based/ULS LiDAR data fusion outperforms ground-based LiDAR with respect to tree parameter estimation compared to field *** fusion-derived tree height,tree volume,and crown volume significantly improved by up to 9.01%,5.28%,and 18.61%,respectively,in terms of *** contrast,the diameter at breast height(DBH)is the parameter that has the least benefits from fusion,and rRMSE remains approximately the same,because stems are already well sampled from ground ***,particularly for dense forests,the fusion-derived tree parameters were improved compared to those derived from ground-based ***-based LiDAR can potentially be used to estimate tree parameters in low-stand-density forests,whereby the improvement owing to fusion is not significant.

关键词： Ground/aerial view mobile LiDAR Point cloud Co-registration Fusion QSM Tree parameter retrieval

FINITE ELEMENT APPROXIMATIONS FOR SCHRDINGER EQUATIONS WITH APPLICATIONS TO ELECTRONIC STRUCTURE COMPUTATIONS

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Journal of Computational Mathematics 2008年第3期26卷 310-323页

作者： xin-Gao Gong Lihua shen Dier Zhang Aihui Zhou Department of Physics Fudan University Shanghai 200433 China Institute of Mathematics and Interdisciplinary Science Department of Mathematics Capital Normal University Beijing 100037 China LSEC ICMSEC Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

In this paper, both the standard finite element discretization and a two-scale finite element discretization for SchrSdinger equations are studied. The numerical analysis is based on the regularity that is also obtained in this paper for the Schroedinger equations. Very satisfying applications to electronic structure computations are provided, too.

关键词： Error analysis Finite element Eigenvalue Quantum chemistry Schroedinger equation Two-scale

Utility and Application of a Versatile Analytical Method for MMF Calculation in AC Machines

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CES Transactions on Electrical Machines and Systems 2024年第1期8卷 22-31页

作者： Ze-Zheng Wu Robert Nilssen Jian-xin shen IEEE the College of Electrical Engineering Zhejiang UniversityHangzhou 310027China the Department of Electric Energy Norwegian University of Science and TechnologyTrondheimNorwayand also affiliated with the College of Electrical EngineeringZhejiang UniversityHangzhou 310027China

A versatile analytical method(VAM) for calculating the harmonic components of the magnetomotive force(MMF) generated by diverse armature windings in AC machines has been proposed, and the versatility of this method has been established in early literature. However, its practical applications and significance in advancing the analysis of AC machines need further elaboration. This paper aims to complement VAM by augmenting its theory, offering additional insights into its conclusions, as well as demonstrating its utility in assessing armature windings and its application of calculating torque for permanent magnet synchronous machines(PMSM). This work contributes to advancing the analysis of AC machines and underscores the potential for improved design and performance optimization.

关键词： AC machine Analytical method Harmonic analysis MMF Magnetic field Torque calculation

Moment Analysis of Process J/φ→ρηπ and 1^(-+) Exotic Hybrid

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Chinese Physics Letters 1999年第7期16卷 484-486页

作者： YU hong shen Qi-xing Institute of High Energy Physics Chinese Academy of SciencesBeijing 100039

Does an exotic 1^(-+) hybrid candidate p(1405)in the vicinity of α_(2)(1320)exist?It is worth to confirm this state in the process J/φ→ρηπ at the BEPC(Beijing Electron-Positron Collider)/BES(Beijing Spectrameter).Considering p(1405),α_(2)(1320)and α_(0)(1450)overlap in this mass region,the three-state coupling structure mode is discussed by using the generalized moment analysis method.A series of moments for the mode and a criterion are given for confirming the exotic 1^(-+) hybrid.

关键词： method. overlap criterion

Enhancement of Curie Temperature and Magnetoresistance in the Perovskit es La_(2/3)Ca_(1/_3)Mn_(1-x)Si_(x)O_(3)

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Chinese Physics Letters 2000年第11期17卷 832-834页

作者： LI Run-Wei WANG Zhi-hong SUN Ji-Rong CHEN xin shen Bao-Gen State Key Laboratory of Magnetism Institute of Physics and Center for Condensed Matter PhysicsChinese Academy of SciencesBeijing 100080

Structural,magnetic,and transport properties of perovskite La_(2/3)Ca_(1/_3)Mn_(1-x)Si_(x)O_(3)(x=0,0.025,0.05)have been *** incorporation of Si decreases the overall resistivity,but obviously increases the Curie temperature(TC),metal-insulator transition temperature(TP),and the magnetoresistance ratio MR(defined as[R(0)-R(H)]/R(0))near room *** with La_(2/3)Ca_(1/_3)MnO_(3)the TC,TP,and MR of the sample with x=0.05 increase by 30,45K,and 20%,*** effects may play a more important role than the magnetic dilution in the case of low Si substitution.

关键词： temperature. resistance (3)

A new methodology for the CFD uncertainty analysis

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Journal of Hydrodynamics 2013年第1期25卷 131-147页

作者： YAO Zhen-qiu shen hong-cui GAO Hui School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology China Ship Scientific Research Center

With respect to the measurement uncertainty, this paper discusses the definition, the sources, the classification and the expressions of the CFD uncertainty. Based on the orthogonal design and the statistics inference theory, a new verification and validation method and the related procedures in the CFD simulation are developed. With the method, two examples of the CFD verification and validation are studied for the drag coefficient and the nominal wake fraction, and the calculation factors and their interactions which would significantly affect the simulation results are obtained. Moreover, the sizes of all uncertainty components resulting from the controlled and un-controlled calculation factors are determined, and the optimal combination of the calculation factors is obtained by an effect estimation in the orthogonal experiment design. It is shown that the new method can be used for the verification in the CFD uncertainty analysis, and can reasonably and definitely judge the credibility of the simulative result. As for CFD simulation of the drag coefficient and the nominal wake fraction, the results predicted can be validated. Although there is still some difference between the simulation results and the experiment results, its approximate level and credibility can be accepted.

关键词： CFD uncertainty verification validation