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Using an Immersive Video Environment to Assess Pedestrians' Compliance With COVID Distance Keeping Interventions

INTERACTING WITH COMPUTERS 2023年第5期35卷 628-636页

作者： Stenkamp, Jan Karic, Benjamin Scharf, Paula Verstegen, Judith A. Kray, Christian Univ Munster Inst Geoinformat Munster Germany Univ Utrecht Dept Human Geog & Spatial Planning Utrecht Netherlands

Physical distancing is a key measure to slow the spread of many highly infectious diseases, e.g. COVID-19. Streetscape interventions such as pedestrian signage can contribute to ensuring distances are kept, but it is unclear to what extent people comply with these in practice. This paper tackles this question using an immersive video environment to realistically simulate real-life streetscapes in the lab. In a controlled user study, we augmented panoramic video footage with pedestrian one-way street signage and recorded route decisions to assess compliance with distance keeping measures. Our results indicate that such signage affects routing decisions and can thus help pedestrians to avoid crowded situations where distance keeping is difficult. We also identified further factors affecting decisions and a correlation between intention to comply and actual compliance. The experimental method we used enabled us to effectively and safely carry out a study of a phenomenon that in the real world depends on interaction with the physical environment. This method may have applications in other areas in which simulations of physical environments are important.

关键词： empirical studies in HCI human-computer interaction (HCI) human-centered computing model development and analysis modeling and simulation computing methodologies

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Global Physical Prior Based Fluid Reconstruction for VR/AR

Global Physical Prior Based Fluid Reconstruction for VR/AR

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30th IEEE Conference Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Zhang, Qifan Xiao, Shibang Cen, Yunchi Han, Jing Liang, Xiaohui Beihang Univ Beijing Peoples R China Beihang Univ China Zhongguancun Lab Beijing Peoples R China

ISBN: (纸本)9798350348392

Fluid is a common natural phenomenon and often appears in various VR/AR applications. Several works use sparse view images and integrate physical priors to improve reconstruction results. However, existing works only consider physical priors between adjacent frames. In our work, we propose a differentiable fluid simulator combined with a differentiable renderer for fluid reconstruction, which can make full use of global physical priors among long series. Furthermore, we introduce divergence-free Laplacian eigenfunctions as velocity bases to improve efficiency and save memory. We demonstrate our method on both synthetic and real data and show that it can produce better results.

关键词： Computing methodologies modeling and simulation model development and analysis modeling methodologies

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An Efficient Self-supporting Infill Structure for Computational Fabrication

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COMPUTER GRAPHICS FORUM 2023年第7期42卷 e14953-e14953页

作者： Wang, Shengfa Liu, Zheng Hu, Jiangbei Lei, Na Luo, Zhongxuan Dalian Univ Technol Int Sch Informat Sci & Engn Dalian Peoples R China Dalian Univ Technol Sch Software Technol Dalian Peoples R China Nanyang Technol Univ Sch Comp Sci & Engn Nanyang Singapore

Efficiently optimizing the internal structure of 3D printing models is a critical focus in the field of industrial manufacturing, particularly when designing self-supporting structures that offer high stiffness and lightweight characteristics. To tackle this challenge, this research introduces a novel approach featuring a self-supporting polyhedral structure and an efficient optimization algorithm. Specifically, the internal space of the model is filled with a combination of self-supporting octahedrons and tetrahedrons, strategically arranged to maximize structural integrity. Our algorithm optimizes the wall thickness of the polyhedron elements to satisfy specific stiffness requirements, while ensuring efficient alignment of the filled structures in finite element calculations. Our approach results in a considerable decrease in optimization time. The optimization process is stable, converges rapidly, and consistently delivers effective results. Through a series of experiments, we have demonstrated the effectiveness and efficiency of our method in achieving the desired design objectives.

关键词： CCS Concepts center dot Computing methodologies -> modeling and simulation model development and analysis center dot Applied computing -> Computer-aided design

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DSNet: Deep Shadow Network for Illumination Estimation 28

DSNet: Deep Shadow Network for Illumination Estimation

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28th IEEE Conference on Virtual Reality and 3D User Interfaces (IEEE VR)

作者： Xiong, Yuan Chen, Hongrui Wang, Jingru Zhu, Zhe Zhou, Zhong Beihang Univ State Key Lab Virtual Real Technol & Syst Beijing Peoples R China Duke Univ RaiLab Durham NC USA

ISBN: (纸本)9781665418386

Illumination consistency has applications to modeling and rendering in virtual reality. In 3D reconstruction and Mixed Reality(MR) fusion, the appearance of a large-scale outdoor scene may change in response to lighting and seasons, for example. Since 3D reconstruction from scratch is costly, it is helpful to be able to update existing models with recently captured photographs. However, the illumination conditions of the captured photograph can be arbitrary, making it challenging to fit to the existing model. To tackle this problem, this paper proposes a novel approach that can precisely estimate the illumination of the input image. Our Deep Shadow Network (DSNet) collaboratively utilizes illumination-based data augmentation for sun position estimation, along with a dataset of illumination-based augmented renderings. Our run-time rendering and optimization strategy is also discussed. We show that accurate simulation of illumination can improve the performance of visual applications including place recognition and long-term localization. Experimental results validate the effectiveness of the proposed approach, and show its superiority over the state-of-the-art.

关键词： Computing methodologies modeling and simulation model development and analysis modeling methodologies Artificial intelligence Computer vision Computer vision problems Reconstruction

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Character navigation in dynamic environments based on optical flow

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COMPUTER GRAPHICS FORUM 2019年第2期38卷 181-192页

作者： Lopez, Axel Chaumette, Francois Marchand, Eric Pettre, Julien Univ Rennes CNRS INRIA IRISA Rennes France

Steering and navigation are important components of character animation systems to enable them to autonomously move in their environment. In this work, we propose a synthetic vision model that uses visual features to steer agents through dynamic environments. Our agents perceive optical flow resulting from their relative motion with the objects of the environment. The optical flow is then segmented and processed to extract visual features such as the focus of expansion and time-to-collision. Then, we establish the relations between these visual features and the agent motion, and use them to design a set of control functions which allow characters to perform object-dependent tasks, such as following, avoiding and reaching. Control functions are then combined to let characters perform more complex navigation tasks in dynamic environments, such as reaching a goal while avoiding multiple obstacles. Agent's motion is achieved by local minimization of these functions. We demonstrate the efficiency of our approach through a number of scenarios. Our work sets the basis for building a character animation system which imitates human sensorimotor actions. It opens new perspectives to achieve realistic simulation of human characters taking into account perceptual factors, such as the lighting conditions of the environment.

关键词： CCS Concepts • Computing methodologies → modeling and simulation model development and analysis model verification and validation Animation

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Parallel Crowd Simulation Based on Power Law 8

Parallel Crowd Simulation Based on Power Law

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8th International Conference on Virtual Reality and Visualization (ICVRV)

作者： Wang, Ji Mao, Tianlu Song, Xiyuan Liu, Shaohua Jiang, Hao Wang, Zhaoqi Chinese Acad Sci Inst Comp Technol Beijing Key Lab Mobile Comp & Pervas Device Beijing Peoples R China Beijing Univ Posts & Telecommun Sch Elect Engn Beijing Peoples R China Univ Elect Sci & Technol China Inst Elect & Informat Engn Guangdong Beijing Peoples R China

ISBN: (纸本)9781538684979

Crowd simulation technology is increasingly used in the fields of film, animation, games, military training, and public safety. In this paper, we propose a parallel crowd simulation model based on Power Law. This model use CUDA architecture to parallelize the Power Law model on GPU, so that each agent's behavior simulation is synchronized on different threads. This model considers the fine effects of the microscopic model while significantly improving the model simulation efficiency, making it possible to simulate large-scale crowds in real time and can accurately obtain the status information of each agent in each frame.

关键词： Computing methodologies modeling and simulation model development and analysis modeling methodologies Computing methodologies Computer graphics Animation Motion processing

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Estimating the UAV Moments of Inertia Directly from Its Flight Data 15

Estimating the UAV Moments of Inertia Directly from Its Flig...

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15th International Conference on Quality in Research (QiR) - International Symposium on Electrical and Computer Engineering

作者： Muliadi, Jemie Langit, Rizki Kusumoputro, Benyamin Univ Indonesia Dept Elect Engn Depok Indonesia

ISBN: (纸本)9781509063970

This article proposes a practical new method to obtain the moment of inertia of UAV, named ARES. The ARES method simultaneously determined all the elements of UAV's Tensor of Inertia, i.e. the moments and the products of inertia through algebraic solving. The ARES method directly uses the UAV Flight Data to accommodate accuracy issues of modeling such as vehicle's geometrical imperfection;manufacturing defect, any non-symmetrical due component placement, etc. This proposed method was applicable for various purposes of UAV modeling e.g. flight control design, flight dynamics analysis, etc. Conventionally, UAV moments of inertia were estimated by tabulating, CAD-based, or pendulum method. Since these existing methods were constrained by the accuracy and practical issues, we develop the ARES method which using the UAV's flight data to resolve both issues. After undergone appropriate mathematical strategies, the ARES produce a linear construction for algebraic solving technique. The implementation the proposed method in the quadrotor flight data showing that ARES are successfully measured the asymmetrical terms which important for nonlinear controlling, that previously neglected by the conventional methods. Thus, the ARES estimates the UAV Tensor of Inertia in holistic, sophisticated and practical fashion.

关键词： moment of inertia inertia tensor modeling methodologies model development and analysis UAV quadrotor modeling

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Computational Yeast Systems Biology: A Case Study for the MAP Kinase Cascade

Computational Yeast Systems Biology: A Case Study for the MA...

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作者： Edda Klipp

Cellular networks and processes can be mathematically described and analyzed in various ways. Here, the case example of a MAP kinase (MAPK) cascade is used to detail steps in the formulation of a system of ordinary differential equations governing the temporal behavior of a signal transduction pathway after stimulation. Different analysis methods for the model are explained and demonstrated, such as stoichiometric analysis, sensitivity analysis, or studying the effect of deletions and protein overexpression. Finally, a perspective on standards concerning modeling in systems biology is *** networks and processes can be mathematically described and analyzed in various ways. Here, the case example of a MAP kinase (MAPK) cascade is used to detail steps in the formulation of a system of ordinary differential equations governing the temporal behavior of a signal transduction pathway after stimulation. Different analysis methods for the model are explained and demonstrated, such as stoichiometric analysis, sensitivity analysis, or studying the effect of deletions and protein overexpression. Finally, a perspective on standards concerning modeling in systems biology is given.

关键词： Saccharomyces cerevisiae signal transduction mathematical models high osmolarity glycerol HOG pathway model development and analysis

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