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Transforming Education with Photogrammetry:Creating Realistic 3D Objects for Augmented Reality Applications

Computer modeling in Engineering & Sciences 2025年第1期142卷 185-208页

作者： Kaviyaraj Ravichandran Uma Mohan Department of computational Intelligence School of ComputingSRM Institute of Science and TechnologyKattankulathur603203India

Augmented reality(AR)is an emerging dynamic technology that effectively supports education across different *** increased use of mobile devices has an even greater *** the demand for AR applications in education continues to increase,educators actively seek innovative and immersive methods to engage students in ***,exploring these possibilities also entails identifying and overcoming existing barriers to optimal educational ***,this surge in demand has prompted the identification of specific barriers,one of which is three-dimensional(3D)*** 3D objects for augmented reality education applications can be challenging and time-consuming for the *** address this,we have developed a pipeline that creates realistic 3D objects from the two-dimensional(2D)*** for augmented and virtual reality can then utilize these created 3D *** evaluated the proposed pipeline based on the usability of the 3D object and performance ***,with 117 respondents,the co-creation team was surveyed with openended questions to evaluate the precision of the 3D object created by the proposed photogrammetry *** analyzed the survey data using descriptive-analytical methods and found that the proposed pipeline produces 3D models that are positively accurate when compared to real-world objects,with an average mean score above *** study adds new knowledge in creating 3D objects for augmented reality applications by using the photogrammetry technique;finally,it discusses potential problems and future research directions for 3D objects in the education sector.

关键词： Augmented reality education immersive learning 3D object creation photogrammetry and StructureFromMotion

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Moment Selection and Generalized Empirical Likelihood Estimation in High-Dimensional Unconditional Moment Conditions

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Journal of Systems Science & Complexity 2024年第6期37卷 2738-2770页

作者： WANG Wenjun YANG Zhihuang Yunnan Key laboratory of statistical modeling and Data Analysis Yunnan UniversityKunming 650091China

This paper investigates the moment selection and parameter estimation problem of highdimensional unconditional moment conditions. First, the authors propose a Fantope projection and selection(FPS) approach to distinguish the informative and uninformative moments in high-dimensional unconditional moment conditions. Second, for the selected unconditional moment conditions, the authors present a generalized empirical likelihood(GEL) approach to estimate unknown parameters. The proposed method is computationally feasible, and can efficiently avoid the well-known ill-posed problem of GEL approach in the analysis of high-dimensional unconditional moment conditions. Under some regularity conditions, the authors show the consistency of the selected moment conditions, the consistency and asymptotic normality of the proposed GEL estimator. Two simulation studies are conducted to investigate the finite sample performance of the proposed methodologies. The proposed method is illustrated by a real example.

关键词： Fantope projection and selection generalized empirical likelihood high dimensionality moment selection unconditional moment condition

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PRESSURE-VELOCITY EQUILIBRIUM HYDRODYNAMIC MODELS

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Acta Mathematica Scientia 2010年第2期30卷 563-594页

作者： John W.Grove computational Physics Group Computer Computationaland Statistical Sciences DivisionCCS-2 MS D413Los Alamos National Laboratory

This article describes mathematical models for phase separated mixtures of materials that are in pressure and velocity equilibrium but not necessarily temperature equilibrium. General conditions for constitutive model... 详细信息

关键词： Euler equations multiple phase mixtures non-equilibrium temperature mixtures

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Conditions for formation and trapping of the two-ion Coulomb cluster in the dissipative optical superlattice

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Chinese Physics B 2015年第6期24卷 305-313页

作者： I.V.Krasnov Institute of computational modeling Siberian DivisionRussian Academy of Sciences

Conditions have been studied under which a polychromatic optical superlattice can form and trap the Coulomb cluster of two strongly interacting ions. In our previous work （Krasnov I V and Kamenshchikov L P 2014 Opt. Comm. 312 192） this new all-optical method of obtaining and confining the Coulomb clusters was demonstrated by numerical simulations for special values of the optical superlattice parameters and in the case of Yb ions. In the present paper the conditions are explicitly formulated, under which the long-lived two-ion cluster in the superlattice cell is formed. The peculiarity of these conditions is the renormalization of the ion-ion Coulomb interaction. Notably, the renormalized Coulomb force is determined by the effective charge which depends on the light field parameters and can strongly differ from the ＂bare＂ ion charge. This result can be accounted for by the combined manifestation of the quantum fluctuations of optical forces, nonlinear dependence of these forces on the velocity, and non-Maxwellian （Tsallis type） velocity distribution of the ions in the optical superlattice. Explicit analytical formulas are also obtained for the parameters of the optical two-ion cluster.

关键词： optical trap ion trap rectified gradient force Coulomb clusters

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Simulating the Peculiar Periphery of the Cygnus Loop

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Research in Astronomy and Astrophysics 2024年第12期24卷 194-208页

作者： Jun-Yu Shen Bi-Wen Bao Li Zhang Department of Astronomy Key Laboratory of Astroparticle Physics of Yunnan Province Yunnan University Key laboratory of statistical modeling and Data Analysis of Yunnan Province Yunnan University

The middle-aged Galactic supernova remnant （SNR）-the Cygnus Loop （CL）-displays a peculiar morphology in X-rays,featuring a blowout in the southern *** underlying process accounting for the formation of the peculiar periphery remains a *** this end,we conduct hydrodynamical simulations to investigate the SNR evolution coupled with a tailored stellar-wind model:a bipolar stellar wind emanating from a runaway red supergiant progenitor,excavating a wind-blown cavity elongated along *** simulation results reveal that the forward shock of the consequent SNR sweeps up the modified ambient media,shaping the overall morphology with a blowout comparable to that of ***,a series of simulation runs are performed to assess the impacts of different model parameters and the projection effect (observational angle θobs) on the final SNR *** physical quantities are extracted from simulation results to characterize the simulated SNR and make a direct comparison with the X-ray observations of *** find that the final SNR morphology is sensitive to both stellar-wind properties and θobs.A Cygnus-Loop-like SNR could be reproduced under appropriate parameter combinations at θobs=0°.While for ■,the projected morphology akin to CL could be also generated under specific conditions.

关键词： hydrodynamics ISM: supernova remnants methods: numerical

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Adjusted Empirical Likelihood Estimation of Distribution Function and Quantile with Nonignorable Missing Data

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Journal of Systems Science & Complexity 2018年第3期31卷 820-840页

作者： DING Xianwen TANG Niansheng Key laboratory of statistical modeling & Data Analysis of Yunnan Province Yunnan University Kunming 650500 China Department of Mathematics Jiangsu University of Technology Changzhou 213001 China

This paper considers the estimation problem of distribution functions and quantiles with nonignorable missing response data. Three approaches are developed to estimate distribution functions and quantiles, i.e., the Horvtiz-Thompson-type method, regression imputation method and augmented inverse probability weighted approach. The propensity score is specified by a semiparametric expo- nential tilting model. To estimate the tilting parameter in the propensity score, the authors propose an adjusted empirical likelihood method to deal with the over-identified system. Under some regular conditions, the authors investigate the asymptotic properties of the proposed three estimators for distri- bution functions and quantiles, and find that these estimators have the same asymptotic variance. The jackknife method is employed to consistently estimate the asymptotic variances. Simulation studies are conducted to investigate the finite sample performance of the proposed methodologies.

关键词： Adjusted empirical likelihood distribution estimation exponential tilting model nonig-norable missing data quantile.

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Absorption of laser radiation in ultracold plasma

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Chinese Physics B 2016年第10期25卷 128-131页

作者： N Y Shaparev Institute of computational modeling Russian Academy of Sciences National Research Tomsk State University

In this paper, we analyze the spectral behavior(optical thickness, shape and linewidth) of laser radiation absorption under the correlation heating of ions in an ultracold plasma. The Voigt formula is used to find the absorption *** spectral line width is shown to grow with time while the optical thickness reduces. Our modeling results are in good agreement with the experimental findings reported in the literature.

关键词： absorption laser radiation ultracold plasma

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D-BERT: Incorporating dependency-based attention into BERT for relation extraction

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CAAI Transactions on Intelligence Technology 2021年第4期6卷 417-425页

作者： Yuan Huang Zhixing Li Wei Deng Guoyin Wang Zhimin Lin Chongqing Key laboratory of computational Intelligence Chongqing University of Posts and TelecommunicationsChongqingChina Centet of statistical Research Southwestern Univetsity of Finance and EconomicsChengduChina

Relation extraction between entity pairs is an increasingly critical area in natural language *** the pre-trained bidirectional encoder representation from transformer(BERT)performs excellendy on the text classification or sequence labelling ***,the high-level syntactic features that consider the dependency between each word and the target entities into the pre-trained language models are *** model also utilizes the intermediate layers of BERT to acquire different levels of semantic information and designs multi-granularity features for final relation *** model offers a momentous improvement over the published methods for the relation extraction on the widely used data sets.

关键词： BERT relation processing.

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The combined effect of optical laser and microwave radiations on a metal surface

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Chinese Physics B 2014年第2期23卷 359-363页

作者： Anatoli P Gavrilyuk Nikolai Ya Shaparev Institute of computational modeling of Siberian Branch of Russian Academy of Sciences Akademgorodok Siberian Federal University

In this paper, it is shown that the laser radiation intensity required for complete ionization of vapors produced on an irradiated metal surface can be reduced by more than an order of magnitude through using pulsed l... 详细信息

关键词： laser microwave radiation metal surface plasma

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Feedback of Efficient Shock Acceleration on Magnetic-field Structure Inside Young Type Ia Supernova Remnants

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Research in Astronomy and Astrophysics 2024年第6期24卷 234-244页

作者： Jun-Yu Shen Bi-Wen Bao Li Zhang Department of Astronomy Key Laboratory of Astroparticle Physics of Yunnan ProvinceYunnan UniversityKunming 650091China Key laboratory of statistical modeling and Data Analysis of Yunnan Province Yunnan UniversityKunming 650091China

Using an effective adiabatic index γ_(eff) to mimic the feedback of efficient shock acceleration,we simulate the temporal evolution of a young type Ia supernova remnant (SNR) with two different background magnetic field(BMF) topologies:a uniform and a turbulent *** density distribution and magnetic-field characteristics of our benchmark SNR are studied with two-dimensional cylindrical magnetohydrodynamic *** γ_(eff)is considered,we find that:(1) the two-shock structure shrinks and the downstream magnetic-field orientation is dominated by the Rayleigh–Taylor instability structures;(2) there exists more quasi-radial magnetic fields inside the shocked region;and (3) inside the intershock region,both the quasi-radial magnetic energy density and the total magnetic energy density are enhanced:in the radial direction,with γ_(eff)=1.1,they are amplified about 10–26 times more than those with γ_(eff)=5/*** in the angular direction,the total magnetic energy densities could be amplified about 350 times more than those with γ_(eff)=5/3,and there are more grid cells within the intershock region where the magnetic energy density is amplified by a factor greater than 100.

关键词： methods:numerical ISM:magnetic fields ISM:supernova remnants magnetohydrodynamics(MHD)

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