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Real-time controlling of crowd paths via distance propagating

Journal of Computational Information Systems 2012年第19期8卷 8009-8016页

作者： Wu, He Qi, Li Gang, Lei Chen, Weilong Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal University Chengdu 610068 China Digital Media Department of Sichuan Normal University Chengdu 610068 China

In this paper, we propose a novel approach for controlling of crowd paths in real-time virtual environments. The proposed algorithm focus on addressing two problems: (1) the grid-based distance propagating for controlling of crowd paths. We propose a grid-based distance propagating algorithm for controlling of crowd paths, which requires no prior knowledge of crowd and obstacles. (2) the penalty function for collision-free. We propose using the penalty function to collision-free, which incorporates safety margins around obstacle using local information. Experimental results show that the proposed algorithm could be used for real-time navigation of many moving crowd in complicated virtual environments. © 2012 Binary Information Press.

关键词： Virtual reality

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A blocked statistics method based on directional derivative

A blocked statistics method based on directional derivative

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2012 International Conference on Web Information Systems and Mining, WISM 2012

作者： Li, Junli Chu, Chengxi Li, Gang Lou, Yang Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal University Chengdu 610066 China Information Science and Engineering College Ningbo University Ningbo 315211 China

ISBN: (纸本)9783642334689

The basic idea of identifying the motion blurred direction using the directional derivative is that the original image be an isotropic first-order Markov random process. However, the real effect of this method is not always good. There are many reasons, of which the main is that a lot of pictures do not meet the physical premises. The shapes of objects and texture of pictures would be vulnerably influenced for identifying. In this paper, according to the image characteristics of the local variance, we extract multiple blocks and identify the motion directions of the blocks to identify the motion blurred direction. Experimental results show that our method not only improve the identification accuracy, but also reduce the amount of computation. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Markov processes

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Traffic accident reconstruction technology research and simulation realization

Traffic accident reconstruction technology research and simu...

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2012 IEEE Symposium on Electrical and Electronics Engineering, EEESYM 2012

作者： Liao, Xuehua Zhu, Zhousen Yan, Yusong Lv, Tao Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Chengdu China Institute of Physics and Electronic Engineer Sichuan Normal University Chengdu China Institute of Computer Science Sichuan Normal University Chengdu China

ISBN: (纸本)9781467323659

Accident reconstruction is not only an important way for responsibility identification or cause analysis in traffic accident but also an important step in study on traffic safety improvement. In this work, a type of physical analysis and an assumption model for traffic accident reconstruction, together with their respective realization methods, were introduced and described;simulation technology in two-vehicle collision accident was investigated;2-Dimension impact calculation of velocity variations before and after collision was specifically given;computer simulation system was established to analyze and reconstruct impact velocities and vehicle behaviors according to data measured in accident scene;software application in practice was also briefly discussed. © 2012 IEEE.

关键词： Virtual reality

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Research and realization of distributed digital registration system for universities

Research and realization of distributed digital registration...

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2012 International Conference on Computer Science and Electronics Engineering, ICCSEE 2012

作者： Liao, Xue-Hua Zhu, Zhou-Sen Wu, Zhen-Dong Yu, Xiao Institute of Computer Science Sichuan Normal University Chengdu Sichuan China Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Chengdu Sichuan China Institute of Physics and Electronic Engineer Sichuan Normal University Chengdu Sichuan China

ISBN: (纸本)9780769546476

In response to the changes in the registration procedure at the universities, i.e. one university has several districts and different registration requirements;this paper proposes the distributed digital registration system that can be customized. We then elaborate on the design and realization method of the system. The university registration procedure is standardized with the use of this system, and the distributed data of related departments are integrated. It is confirmed that the system can operate in good conditions. © 2012 IEEE.

关键词： component Digital Registration Distributed System Process Customization

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Confidence estimation for graph-based semi-supervised learning

Journal of Software

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Journal of Software 2012年第6期7卷 1307-1314页

作者： Guo, Tao Li, Guiyang Visual Computing and Visual Reality Key Laboratory of Sichuan Province Chengdu China College of Computer Science Sichuan Normal University Chengdu China

To select unlabeled example effectively and reduce classification error, confidence estimation for graph based semi-supervised learning (CEGSL) is proposed. This algorithm combines graph-based semi-supervised learning with collaboration-training. It makes use of structure information of sample to calculate the classification probability of unlabeled example explicitly. With multi-classifiers, the algorithm computes the confidence of unlabeled example implicitly. With dual confidence estimation, the unlabeled example is selected to update classifiers. The comparative experiments on UCI datasets indicate that CEGSL can effectively exploit unlabeled data to enhance the learning performance. © 2012 ACADEMY PUBLISHER.

关键词： Classification (of information)

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ON THE CONCENTRATION PROPERTIES FOR THE NONLINEAR SCHRDINGER EQUATION WITH A STARK POTENTIAL

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Acta Mathematica Scientia 2011年第5期31卷 1923-1938页

作者：朱世辉张健 Visual Computing and Virtual Reality Key Laboratory Sichuan Normal University College of Mathematics Sichuan University

In this paper, we study blow-up solutions of the Cauchy problem to the L2 critical nonlinear Schrdinger equation with a Stark potential. Using the variational characterization of the ground state for nonlinear Schrdinger equation without any potential, we obtain some concentration properties of blow-up solutions, including that the origin is the blow-up point of the radial blow-up solutions, the phenomenon of L2-concentration and rate of L2-concentration of blow-up solutions.

关键词： nonlinear Schrdinger equation blow-up solution blow-up point L2-concentration concentration compact principle

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Traffic accident reconstruction technology research and simulation realization

Traffic accident reconstruction technology research and simu...

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IEEE Symposium on Electrical & Electronics Engineering (EEESYM)

作者： Xuehua Liao Zhousen Zhu Yusong Yan Tao Lv 1. Visual Computing and Virtual Reality Key Laboratory of Sichuan Province 2. Institute of Computer Science of Sichuan Normal University Chengdu Sichuan China Institute of Physics and Electronic Engineer of Sichuan Normal University Chengdu Sichuan China Institute of Computer Science of Sichuan Normal University Chengdu Sichuan China

ISBN: (纸本)9781467323635

Accident reconstruction is not only an important way for responsibility identification or cause analysis in traffic accident but also an important step in study on traffic safety improvement. In this work, a type of physical analysis and an assumption model for traffic accident reconstruction, together with their respective realization methods, were introduced and described; simulation technology in two-vehicle collision accident was investigated; 2-Dimension impact calculation of velocity variations before and after collision was specifically given; computer simulation system was established to analyze and reconstruct impact velocities and vehicle behaviors according to data measured in accident scene; software application in practice was also briefly discussed.

关键词： Educational institutions

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Crowd flow-based information for crowd simulation

International Journal of Digital Content Technology and its ...

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International Journal of Digital Content Technology and its Applications 2012年第23期6卷 145-152页

作者： Wu, He Qi, Li Rao, Yunbo Visual Computing and Virtual Reality Key Laboratory of Sichuan Province Sichuan Normal University Chengdu Sichuan 610068 China Digital Media Department Sichuan Normal University Chengdu Sichuan 610068 China School of Information Science and Technology Southwest Jiaotong University Chengdu Sichuan 610031 China School of Information and Software Engineering University of Electronic Science and Technology of China Chengdu Sichuan 6100541 China

In this paper, we propose a novel algorithm for crowd simulation in real-time virtual environments. The proposed algorithm uses a navigation mesh for global planning in a polygonal multilayered threedimensional (3D) environment and crowd flow-based information to help individuals collision-free. At the same time, the proposed algorithm also focuses on addressing two problems: 1) in order to improve precision of collision-free, we propose based on hierarchy priority for collision-free of the individuals. 2) To avoid "shaking" behaviors of the individuals in the original place, we propose the stopping rule for solving it. Experimental results show that the proposed algorithm could be used for crowd simulation in complicated virtual environments.

关键词： Virtual reality

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Adaptive Framework for Online Deployment of Virtual Scenes on Heterogeneous Applications

Adaptive Framework for Online Deployment of Virtual Scenes o...

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The 2011 International Conference on Advanced Materials and Information Technology Processing(AMITP 2011)

作者： Qianyi Gu Visual Computing and Virtual Reality Key Laboratory of Sichuan Province College of Computer Science Sichuan Normal University

ISBN: (纸本)9783037851579

With emergence of online virtual reality applications, the 3D data of virtual scenes are available to heterogeneous end user devices with relatively limited computing power, resolution and transmission rate. Still, many virtual scenes created by expert developers are composed of complex 3D data models with huge number of geometry primitives and appearence elements. This complexity can cause a lot of problems when the scenes are deployed on the limited access devices. To address this issue, we propose a virtual scene adaptation framework which is able to perform the transformation of given complex 3D model into new forms with less geometric and appearance data. Through the framework, complex virtual scenes are connected with real-world semantics and are preprocessed with selected optimization strategies based on the semantic features matching client devices' capabilities before deployment.

关键词： Virtual reality,Semantics,Ontology,Optimization,Deployment

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Define a function on gene order of DNA microarray data and use it to identify genes associated with Alzheimer's disease

Define a function on gene order of DNA microarray data and u...

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IEEE International Conference on Granular computing (GRC)

作者： Ben-Qiong Hu Pei Shuai Zheng-chao Shan Chao-Yang Pang College of Management Science Chengdu University of Technology Chengdu China Group of Gene Computation College of Mathematics and Software Science Sichuan Normal University Chengdu China Group of Gene Computation Key Laboratory of Visual Computation and Virtual Reality of Sichuan Province Chengdu China

Alzheimer's disease (AD) is the most ordinary kind of dementia. Identifying genes associated with AD is a new topic, and the key is to design algorithm to search AD genes. Gene order is a permutation of genes in which similar genes are ordered together. In this paper, a function is defined on gene order, and function value measures the similarity degree between a gene and its neighbors. Through the function value, the neighbors of a gene can be identified. The genes keeping as neighbor of AD gene (APOE, presenilins 1 or 2) at any stage (control, incipient, moderate, severe) are identified as the candidate of the gene associated with AD, where AD gene has been proved acting risk factor of AD. Experiment results of this paper have been proved some genes associated with AD.

关键词： Vectors Alzheimer's disease DNA Gene expression Heating

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