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检索条件"机构=Research Center of Virtual Reality and Visualization Technology and Engineering"

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research on Severe Weather Prediction Model Based on Multi-view Learning

Research on Severe Weather Prediction Model Based on Multi-v...

引用

2021 International Conference on Electronic Information engineering and Computer Science, EIECS 2021

作者： Sun, Wenjie Zhang, Suli Zheng, Guoxun Zhang, Weixuan Changchun University of Technology School of Computer Science Engineering Jilin Prov. Changbai Mt. Ecol. Culture and Virtual Reality Simulation Engineering Research Center Jilin Provincial Key Laboratory of Changbai Historical Culture and VR Reconstruction Technology Changchun China

ISBN: (纸本)9781665416740

In the study of accurate prediction of severe weather, the regional climate characteristics are often not considered for targeted prediction. For the purpose of predicting severe weather more scientifically and accurately, and further accelerate the development of tourism in the Changbai Mountain area, we collect weather data in the Changbai Mountain area, redivision of severe weather based on regional characteristics, and propose Tri-Training severe weather forecasting model based Multi-view Semi-Supervised Learning. The experimental results show that the model proposed in this paper can accurately predict severe weather based on a very small number of labeled weather samples. When the proportion of labeled data samples is 20%, the model accuracy can reach more than 85%, and when the labeled data reaches 80%, the prediction accuracy can reach 95%. © 2021 IEEE.

关键词： Weather forecasting

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RETRACTED ARTICLE: The relationship between COP and COM during upright stance with ankle fixation

RETRACTED ARTICLE: The relationship between COP and COM duri...

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作者： Rui, Kou Fang, Pu Yang, Yang Meng, Zhang Honglun, Su Deyu, Li Yubo, Fan State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing 100191 China School of Biological Science and Medical Engineering Beihang University Beijing 100191 China National Research Center for Rehabilitation Technical Aids Beijing 100176 China

ISBN: (纸本)9781424450893

center of pressure (COP) excursion is often used to quantify the stability of standing balance in clinical and experiments, but in fact, the stand balance is determined by maintaining the center of mass (COM) of body within the base of support. As ankle fixation will change the mechanism of keeping standing balance, the relationship between COP and COM may also be changed. On the purpose of discussing whether COP can still be used to assess the stability of standing balance with ankle fixed, this study employed a method for simultaneous measurement of COP and COM to acquire 10 subjects' standing balance data. Then we analyzed the difference between COP and COM during standing with or without ankles fixation. We found there are some differences and the correlation between COP and COM decreased. Therefore, we suggest these differences should be considered when COP is used to quantify the balance stability of postures with ankle fixation. © 2011 IEEE.

关键词： Biomedical engineering

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An improved vertex-clustering-based progressive mesh encoder

An improved vertex-clustering-based progressive mesh encoder

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Guoping Wang Yongzhen Wu Guojing Hu Jingliang Peng Beijing Engineering Research Center of Virtual Simulation and Visualization (Peking University) School of Computer Science and Technology Shandong University

In this work, we propose improvements on a state-of-the-art scheme for progressive triangular mesh compression, which is based on hierarchical vertex clustering. Specifically, we fix several shortcomings of that scheme including quantization error accumulation, false facet generation and lack of facet orientation encoding. In addition, the resultant mesh encoder yields better rate-distortion performance than another state-of-the-art one on our test model, as demonstrated by the experiments.

关键词： Encoding Geometry Three-dimensional displays Rate-distortion Solid modeling visualization Intellectual property

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RETRACTED ARTICLE: A quantitative method for assessing the effect of training tasks on hand motor function

RETRACTED ARTICLE: A quantitative method for assessing the e...

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ISBN: (纸本)9781424450893

Training program is important for the rehabilitation of hand function, but its design is still based on the experience of the therapists. This paper presents a quantitative method based on quantity of the movement (QOM) to assess the effect of training tasks on certain joints, which can be a basis on establishing proper training programs for the concerned joints and fingers. Twelve subjects participated in 11 training tasks, and the movements of 14 joints of hand were recorded with data glove in each task, then QOM of each joint was calculated. The results demonstrated the feasibility of quantifying the training tasks with QOM. The joints that showed high QOM in a certain task were considered to be effectively trained by this task. Based on this, we can choose some specific tasks for training certain pathological joints and fingers. © 2011 IEEE.

关键词： Personnel training

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research on Image Feature Point Matching Based on ORB and RANSAC Algorithm 2

Research on Image Feature Point Matching Based on ORB and RA...

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2020 2nd International Conference on Artificial Intelligence Technologies and Application, ICAITA 2020

作者： Zhang, Hua Zheng, Guoxun Fu, Haohai School of Computer Technology and Engineering Changchun Institute of Technology Changchun Jilin130012 China Jilin Provincial Key Laboratory of Changbai Historical Culture and VR Reconstruction Technology Changchun Jilin130012 China Jilin Provincial Engineering Research Center Changbai Ecological Culture Virtual Reality Simulation Changchun Jilin130012 China

Image matching is one of the basic problems in the field of machine vision research. In order to improve the accuracy of image feature point matching and enhance the anti-interference ability of the algorithm, for the shortcomings of traditional ORB algorithm, an image feature point matching algorithm based on ORB and RANSAC algorithm is proposed. The algorithm can filter out false matches on the basis of coarse matching results, and filter out exact matching points through the homography matrix. Experiments show that this method can effectively improve the accuracy of image matching and shorten the execution time, and it is very robust to image matching with different scales, ambiguities, brightness and rotation. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Image matching

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COMPRESSING MATERIAL AND TEXTURE ATTRIBUTES FOR TRIANGULAR MESHES

COMPRESSING MATERIAL AND TEXTURE ATTRIBUTES FOR TRIANGULAR M...

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IEEE International Conference on Multimedia and Expo

ISBN: (纸本)9781479947607

A novel scheme for single-rate compression of material and texture attributes for triangular meshes is proposed in this work. For the material coding, it proposes a novel approach based on breadth-first surface traversal, exploiting the local coherence of the material attributes among neighboring facets;for the texture coordinate coding, it proposes a similar-triangle-based prediction method, exploiting the correlation between 3D geometry and its texture-space parameterization. As a result, the proposed algorithm achieves efficient coding of the material and the texture attributes, as experimentally demonstrated.

关键词： Compression Material Texture Mesh

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Modelling Study on Learning Affects for Classroom Teaching/Learning Auto-Evaluation

Modelling Study on Learning Affects for Classroom Teaching/L...

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2018第三届教育与创新国际会议

作者： Minyu Pan Jing Wang Zuying Luo College of Information Science and Technology Beijing Normal University Engineering Research Center of Virtual Reality and Applications Ministry of Education

In studies on classroom teaching auto-evaluation, we have achieved some remarkable results in Classroom Attendance Auto-management, learning attention & facial expression auto-analysis. For further utilizing learning affects to auto-evaluate classroom teaching/learning effects, we watch a large number of classroom videos. Then, based on the stimulus-response mechanism, we use learning facial expressions & attention to categorize students' learning affects(SLA) and construct a SLA transfer model. At last, we simply describe how to use SLA analysis results to auto-evaluate the classroom teaching/learning effects. This work lays a theoretical foundation for the studies on learning facial expressions and learning affects for classroom teaching/learning auto-evaluation.

关键词： Learning Affect Classroom Evaluation Affect Modelling Facial Expression Recognition

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Aging Simulation of 3D Models Based on Curvature Analysis and Color Transition

Aging Simulation of 3D Models Based on Curvature Analysis an...

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International Conference on virtual reality and visualization (ICVRV)

作者： Ying Zhou Mingquan Zhou Zhongke Wu Wuyang Shui Qingqiong Deng Wei Wang College of Information Science and Technology Engineering Research Center of Virtual Reality and Applications Beijing P.R.C

ISBN: (纸本)9781467376747

Aging simulation is one of the hot issues in the field of realistic rendering. This paper presents a method to simulate the aging phenomena of 3D models with the combination of curvature analysis and color transition. For a given 3D model, we analyze the curvature of each vertex, so as to determine its global geometrical features. And then on the assumption that different areas reflect diversely in the process of aging, we use curvature as a determining factor as we make color transition rules to simulate the visual effect of a certain aging phenomenon. The experimental results show that our method can achieve a satisfying sense of reality at a low time expense.

关键词： Aging Color Solid modeling Analytical models Three-dimensional displays Image color analysis Rendering (computer graphics)

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visualization Analysis of Learning Attention Based on Single-image Pn P Head Pose Estimation

Visualization Analysis of Learning Attention Based on Single...

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2017 2nd International Conference on Education,Sports,Arts and Management engineering(ICESAME 2017)

作者： Li Dongxing Liu Heng Chang Wenquan Xu Pengfei Luo Zuying College of Information Science and Technology Beijing Normal University Engineering Research Center of Virtual Reality and Applications Ministry of Education

Learning attention analysis of students is the important indicator of classroom teaching/learning quantitative evaluation. Owing to the fact that the head-mounted eye tracker is expensive and unsuitable to be widely used in the large-scale classroom evaluation under expenditure limitation, in this paper, we uses the Pn P(Perspective-nPoint) method to estimate student's head pose for single-image. And then we achieve visualization of learning attention. Experiments demonstrate the following advantages of our method.(1) The method limits the average head-pose estimation errors under 4.88° with Biwi database.(2) This work has implemented student learning attention visualization analyses for three typical learning cases including engagement, attention, and disregard.

关键词： Head Pose visualization Attention Analysis Classroom Evaluation

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Design of temperature compensation for silicon-sapphire pressure sensor

Design of temperature compensation for silicon-sapphire pres...

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2017 IEEE International Conference on Imaging Systems and Techniques, IST 2017

作者： Manguo, Huang Defeng, Liu Chao, Lu Zhanshe, Guo Xin, Li Advanced Sensor Technology Center AVIC Beijing Changcheng Aeronautic Measurement Control Technology Research Institute Aviation Key Laboratory of Science and Technology Special Condition Monitoring Sensor Technology Beijing China School of Instrument Science and Opto-electronics Engineering State Key Laboratory of Virtual Reality Technology and Systems Beihang University Beijing China

ISBN: (纸本)9781538616208

In order to solve the problem that the temperature drift of the silicon-on-sapphire pressure sensor is too large to reduce the accuracy of pressure measurement at high temperature, a temperature compensation scheme based on a single chip is proposed. The temperature of the working environment is obtained by a PT100, and integrated with the output of pressure sensor to calculate the compensated pressure sensor. Problems of power supply and signal acquisition are solved by the high precision, low drift voltage and current references, programmable amplifiers and high precision ADCs on chip. According to the working characteristics of the silicon-on-sapphire pressure sensor, an efficient temperature compensation algorithm is designed, and written to the on-chip ARM processor. The experimental results show that the maximum measurement error of pressure in the temperature range of -20∼250°C and measurement range of 0∼28 MPa is 8.37%FS before compensation and reduced to 0.3%FS after compensation. The accuracy of the sensor is greatly improved by the compensation system. © 2017 IEEE.

关键词： Pressure sensors

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