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Big data analytics: six techniques

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Geo-Spatial Information Science 2016年第2期19卷中插3-中插3,119-128页

作者： Hong shu The State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing (LIESMARS)Wuhan UniversityWuhanChina Collaborative Innovation Center of Geospatial Technology Wuhan UniversityWuhanChina

Big data have 4V characteristics of volume, variety, velocity, and veracity, which authentically calls for big data analytics. However, what are the dominant characteristics of big data analysis? Here, the analytics is related to the entire methodology rather than the individual specific analysis. In this paper, six techniques concerning big data analytics are proposed, which include: (1) Ensemble analysis related to a large volume of data, (2) Association analysis related to unknown data sampling, (3) High-dimensional analysis related to a variety of data, (4) Deep analysis related to the veracity of data, (5) Precision analysis related to the veracity of data, and (6) Divide-and-conquer analysis related to the velocity of *** essential of big data analytics is the structural analysis of big data in an optimal criterion of physics, computation, and human cognition. fundamentally, two theoretical challenges, ie the violation of independent and identical distribution, and the extension of general set-theory, are posed. In particular, we have illustrated three kinds of association in geographical big data, ie geometrical associations in space and time, spatiotemporal correlations in statistics, and space-time relations in semantics. furthermore, we have illustrated three kinds of spatiotemporal data analysis, ie measurement (observation) adjustment of geometrical quantities, human spatial behavior analysis with trajectories, data assimilation of physical models and various observations, from which spatiotemporal big data analysis may be largely derived.

关键词： Big data ensemble analysis association analysis high-dimensional analysis deep analysis precision analysis divide-and-conquer analysis

Holocene shelf-coastal sedimentary systems associated with the Changjiang River: An overview

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Acta Oceanologica Sinica 2013年第12期32卷 4-12页

作者： GAO shu Ministry of Education Key Laboratory for Coast and Island Development Nanjing University

The fate of the terrestrial sediment supplied by rivers is a critical issue for understanding the patterns of Holocene environmental change on continental shelves. The East China Sea is a typical broad continental shelf with abundant sediment supply from large rivers. Here, a variety of sedimentary records were formed during the Holocene period. The sedimentary systems associated with these records have unique charac- teristics in terms of spatial distribution, material composition, deposition rate and the timing of deposition, which are related to active sediment transport processes induced by tides and waves, shelf circulations and sediment gravity flows. The sedimentary records thus formed are high resolution slices, i.e., each record has a temporal resolution of up to 10^-10-1 a, but only covers a limited part of the Holocene time. In terms of the spatial distribution, these records are scattered over a large area on the shelf. Further studies of these systems are required to understand the underlying process-product relationships. In particular, the mid- Holocene coastal deposits on the Jiangsu coast, the early to middle Holocene sequences of the Hangzhou Bay, as well as the Holocene mud deposits off the Zhejiang-Fujian coasts, should be investigated in terms of the material supply （from both seabed reworking during the sea level rise event and river discharges）, transport-accumulation processes, the sediment sequences and the future evolution of the sedimentary systems. Advanced numerical modeling techniques should be developed to meet the needs of these studies.

关键词： Transport-accumulation processes Holocene sedimentary systems process-product relationships sedimentary records East China Sea

Anisotropic exciton Stark shift in hemispherical quantum dots

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Chinese Physics B 2021年第5期30卷 338-347页

作者： shu-Dong Wu College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China

The exciton Stark shift and polarization in hemispherical quantum dots(HQDs)each as a function of strength and orientation of applied electric field are theoretically investigated by an exact diagonalization method.A highly anisotropic Stark redshift of exciton energy is *** the electric field is rotated from Voigt to Faraday geometry,the redshift of exciton energy monotonically *** is because the asymmetric geometric shape of the hemispherical quantum dot restrains the displacement of the wave function to the higher orbital state in response to electric field along Faraday geometry.A redshift of hole energy is found all the time while a transition of electron energy from this redshift to a blueshift is found as the field is rotated from Voigt to Faraday *** advantage of the diminishing of Stark effect along Faraday geometry,the hemispherical shapes can be used to improve significantly the radiative recombination efficiency of the polar optoelectronic devices if the strong internal polarized electric field is along Faraday geometry.

关键词： anisotropic Stark shift exciton hemispherical quantum dots electric field

Electromagnetically Induced Transparency in an Optomechanical System

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Chinese Physics Letters 2011年第10期28卷 87-90页

作者： shu Jing School of Electronic and Optical Engineering Nanjing University of Science and TechnologyNanjing 210094

We demonstrate a form of induced transparency enabled by the large gradient force between one optical and two mechanical *** tune the frequency of the mechanical flapping mode into resonance with the mechanical breathing mode to obtain the internal mechanical *** with all-photonic physical systems,the quantum optomechanical system exhibits a significantly longer lifetime.

关键词： mode transparency Electromagnetic

Singularities of the Curve Shortening Flow in a Riemannian Manifold

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Acta Mathematica Sinica,English Series 2021年第11期37卷 1783-1793页

作者： shu Jing PAN School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026P.R.China

In this paper,the curve shortening flow in a general Riemannian manifold is studied,Altschuler’s results about the flow for space curves are *** any n-dimensional(n ≥ 2)Riemannian manifold(M,g) with some natural ass... 详细信息

关键词： Curve shortening flow blow-up singularity formation

The Implementation and Evaluation of Training Course for Chinese as Second Language E-Teacher

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Computer Technology and Application 2012年第10期3卷 706-711页

作者： shu-Ping Chang huei-Tse Hou Kuo-En Chang Yao-Ting Sung You-huei Chen Department of Multimedia Design Chihlee Institute of Technology Taipei 220 Taiwan Graduate Institute of Engineering National Taiwan University of Science and Technology Taipei 106 Taiwan Graduate Institute of Information and Computer Education National Taiwan Normal University Taipei 106 Taiwan Department of Educational Psychology and Counseling National Taiwan Normal University Taipei 106 Taiwan

In this study, we made references to past literatures and developed an e-learning training program for CSL （Chinese as a Second Language） teachers. The class was held from July to August, 2010, in Chinese Culture University （Taiwan）, and we designed a performance-evaluation questionnaire with the Delphi method. Three months after the training program was completed, the questionnaire was given to the 30 students of the class, and they were asked to answer questions regarding their use of e-learning in the actual practice. We also asked 5 teachers to conduct experimental e-learning for us to video-record and observe. This effort allows us to discuss the use of e-learning among CSL teachers in Taiwan, come up with a conclusion and suggestions, and use the findings as references for course-planning and policies or research regarding the digital learning of Chinese.

关键词： E-learning CFL (Chinese as a foreign language) CSL (Chinese as a second language) CALL (computer-assistedlanguage learning).

Review:Acute lung injury/acute respiratory distress syndrome (ALI/ARDS): the mechanism,present strategies and future perspectives of therapies

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第1期8卷 60-69页

作者： LUH Shi-ping CHIANG Chi-huei Department of Surgery Chung-Shan Medical University Hospital 402 Taichung Taiwan China Division of Pulmonary Immunology and Infectious Diseases Taipei Veterans General Hospital 112 Taipei Taiwan China

Acute lung injury/acute respiratory distress syndrome （ALI/ARDS）, which manifests as non-cardiogcnic pulmonary edema, respiratory distress and hypoxemia, could be resulted from various processes that directly or indirectly injure the lung. Extensive investigations in experimental models and humans with ALI/ARDS have revealed many molecular mechanisms that offer therapeutic opportunities for cell or gene therapy. Herein the present strategies and future perspectives of the treatment for ALI/ARDS, include the ventilatory, pharmacological, as well as cell therapies.

关键词： Acute lung injury Acute respiratory distress syndrome Ventilator Cell therapy

Onβ-extinction and Stability of a Stochastic Lotka-Volterra System with Infinite Delay

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Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1045-1059页

作者： shu-fen ZHAO School of Mathematics and Statistics Taishan UniversityTaian 271000China

In this paper,a stochastic Lotka-Volterra system with infinite delay is considered.A new concept of extinction,namely,the almost sureβ-extinction is proposed and sufficient conditions for the solution to be almost sureβ-extinction are *** the positive equilibrium exists and the intensities of the noises are small enough,any solution of the system is attracted by the positive ***,numerical simulations are carried out to support the results.

关键词： almost sureβ-extinction Lotka-Volterra system infinite delay

DRAG REDUCTION OF A CATIONIC SURFACTANT SOLUTION AND ITS SHEAR STRESS RELAXATION

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Journal of Hydrodynamics 2012年第2期24卷 202-206页

作者： CAI shu-peng Institute of High Pressure Water Jet Hunan University of Technology Zhuzhou 412007 China

In order to study the mechanisms of the turbulent frictional drag reduction by surfactant additives,the drag reduction,the shear viscosity and the shear stress relaxation were measured for solutions of a cationic surfactant cetyltrimethyl ammonium bromide （CTAB） with the same molar sodium salicylate as a *** is found that the first step relaxation time decreases with increasing concentration and,thus,with the maximum drag-reducing rates,which indicates that the stiffness of the micellar structures with the first relaxation time,increases with the increase of the concentration of ***,for this surfactant,a viscoelastic property is necessary for reducing drag,while a stronger viscoelasticity characterized by a tail relaxation time does not necessarily mean a higher drag-reducing rate.

关键词： drag reduction shear stress relaxation relaxation time viscoelasticity