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arXiv 2022年

作者： Cheng, Kai Chen, Hao Yin, Wei Xu, Guangkai Chen, Xuejin The National Engineering Laboratory for Brain Inspired Intelligence Technology and Application University of Science and Technology of China Hefei230026 China The Computer Graphics and Computer Assisted Design Laboratory Zhejiang University Hangzhou310058 China DJI Technology

Multi-view depth estimation plays a critical role in reconstructing and understanding the 3D world. Recent learning-based methods have made significant progress in it. However, multi-view depth estimation is fundamentally a correspondence-based optimization problem, but previous learning-based methods mainly rely on predefined depth hypotheses to build correspondence as the cost volume and implicitly regularize it to fit depth prediction, deviating from the essence of iterative optimization based on stereo correspondence. Thus, they suffer unsatisfactory precision and generalization capability. In this paper, we are the first to explore more general image correlations to establish correspondences dynamically for depth estimation. We design a novel iterative multi-view depth estimation framework mimicking the optimization process, which consists of 1) a correlation volume construction module that models the pixel similarity between a reference image and source images as all-to-all correlations;2) a flow-based depth initialization module that estimates the depth from the 2D optical flow;3) a novel correlation-guided depth refinement module that reprojects points in different views to effectively fetch relevant correlations for further fusion and integrate the fused correlation for iterative depth update. Without predefined depth hypotheses, the fused correlations establish multi-view correspondence in an efficient way and guide the depth refinement heuristically. We conduct sufficient experiments on ScanNet, DeMoN, ETH3D, and 7Scenes to demonstrate the superiority of our method on multi-view depth estimation and its best generalization ability. Copyright © 2022, The Authors. All rights reserved.

关键词： Optimization

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Stress topology analysis for porous infill optimization

arXiv

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arXiv 2021年

作者： Wang, Junpeng Wu, Jun Westermann, Rüdiger Computer Graphics and Visualzation Technical University of Munich Munich Germany Department of Sustainable Design Engineering Delft University of Technology Delft Netherlands

The optimization of porous infill structures via local volume constraints has become a popular approach in topology optimization. In some design settings, however, the iterative optimization process converges only slowly, or not at all even after several hundreds or thousands of iterations. This leads to regions in which a distinct binary design is difficult to achieve. Interpreting intermediate density values by applying a threshold results in large solid or void regions, leading to sub-optimal structures. We find that this convergence issue relates to the topology of the stress tensor field that is simulated when applying the same external forces on the solid design domain. In particular, low convergence is observed in regions around so-called trisector degenerate points. Based on this observation, we propose an automatic initialization process that prescribes the topological skeleton of the stress field into the material field as solid simulation elements. These elements guide the material deposition around the degenerate points, but can also be remodelled or removed during the optimization. We demonstrate significantly improved convergence rates in a number of use cases with complex stress topologies. The improved convergence is demonstrated for infill optimization under homogeneous as well as spatially varying local volume constraints. © 2021, CC BY-NC-ND.

关键词： Stress tensor

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Measuring and Modeling the Influences of Street Tree Species on Microclimate and Pedestrian Comfort 7

Measuring and Modeling the Influences of Street Tree Species...

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2022 7th International Conference on Information Science, computer Technology and Transportation, ISCTT 2022

作者： Li, Yingnan Song, Zipeng Ding, Lu Liu, Tao Zhou, Zhengzhong Cheng, Kai Department of Environmental Design School of Arts Jiangsu University Zhenjiang212013 China Department of Environmental Planning Institute Seoul National University Seoul08826 Korea Republic of Department of Computer Graphics Technology Purdue University West Lafayette47907 United States Institute of Urban and Rural Mining Changzhou University Changzhou213164 China Zhenjiang Puyuan Ecological Technology Co. Ltd. Zhenjiang212000 China

ISBN: (纸本)9783800760565

Street trees are important components of urban green spaces, and their ecosystem services improve the urban thermal environment. The shade from the tree cover can create a more comfortable pedestrian space in a city with hot summer. In addition, urban microclimate analyses are becoming more and more to address the planning decision process to create liveable and healthy public spaces. However, the specific relationship between street tree species and microclimate has not been sufficiently studied in diverse urban settings. Therefore, this study took two typical "three boards and four belts" type streets in Nanjing as a study site. The research objective is to investigate how the street tree species affect microclimate and pedestrian comfort. We analyzed the microclimate variations by on-site meteorological measurement. Furthermore, the ENVI-met model was used to analyze the optimal strategies for improving the thermal environment. The human thermal comfort was evaluated by Universal Thermal Climate Index (UTCI), which can be calculated in the model. The results revealed: (1) the microclimate in the streets planted with deciduous trees can create a better thermal environment than conifers. (2) Street trees performed differently by influencing the thermal environment in streets in different directions. (3) Over-dense tree canopy may reduce the vertical air circulation, which leads to the heated air block in the pedestrian spaces. The findings of this study showed great opportunities for supporting decision-makers in improving the urban thermal environment through street greenery. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Decision making

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Influence of Voltage Deviation and Asymmetry on Transitional Processes in Asynchronous Electric Drive 20

Influence of Voltage Deviation and Asymmetry on Transitional...

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20th IEEE International Conference on Modern Electrical and Energy Systems, MEES 2021

作者： Savchenko, Vitaliy Synyavskiy, Oleksandr Dudnyk, Alla Nesvidomin, Andriy National University of Life and Environmental Sciences of Ukraine Department of Electroenergetics Electrotechnics and Electromechanics Kyiv Ukraine National University of Life and Environmental Sciences of Ukraine Department of Automatics and Robototechnical Systems Kyiv Ukraine National University of Life and Environmental Sciences of Ukraine Department of Descriptive Geometry Computer Graphics and Design Kyiv Ukraine

ISBN: (纸本)9781665423663

Investigations of electromagnetic and electromechanical transients in an asynchronous electric drive with voltage deviation and asymmetry have been carried out. Analytical expressions are obtained that describe the transients in an asynchronous electric drive with a shock load at voltage deviation and *** the voltage decreases and asymmetries, the electromechanical constant of time increases, and as the voltage increases, electromechanical constant decreases. As a result, in drives with a small electromechanical time constant, increasing the voltage can cause torques and speed to fluctuate, while reducing and asymmetry can eliminate *** electric drives with a large moment of inertia, the transient process is aperiodic. When the voltage is higher than the nominal one, the duration of the transient process decreases, and when the voltage decreases and asymmetries, duration of the transient process *** decrease and asymmetry of the voltage causes a decrease in the steady angular speed compared to the nominal, and an increase in voltage - angular speed increase. © 2021 IEEE.

关键词： Electric drives

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SGLDBench: A Benchmark Suite for Stress-Guided Lightweight 3D designs

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IEEE Transactions on Visualization and computer graphics 2025年 PP卷 PP页

作者： Wang, Junpeng Bukenberger, Dennis R. Niedermayr, Simon Neuhauser, Christoph Wu, Jun Westermann, Rudiger Technische Universität München Computer Graphics & Visualization Group Garching Germany Delft University of Technology Department of Sustainable Design Engineering Delft Netherlands

We introduce the Stress-Guided Lightweight design Benchmark (SGLDBench), a comprehensive benchmark suite for applying and evaluating material layout strategies to generate stiff, lightweight designs in 3D domains. SGLDBench provides a seamlessly integrated simulation and analysis framework, including six reference strategies and a scalable multigrid elasticity solver to efficiently execute these strategies and validate the stiffness of their results. This facilitates the systematic analysis and comparison of design strategies based on the mechanical properties they achieve. SGLDBench enables the evaluation of diverse load conditions and, through the tight integration of the solver, supports high-resolution designs and stiffness analysis. Additionally, SGLDBench emphasizes visual analysis to explore the relationship between the geometric structure of a design and the distribution of stresses, offering insights into the specific properties and behaviors of different design strategies. SGLDBench's specific features are highlighted through several experiments, comparing the results of reference strategies with respect to geometric and mechanical properties. © 1995-2012 IEEE.

关键词： Shape optimization

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Generation of Entrepreneurship Environments for New Product Development 10th

Generation of Entrepreneurship Environments for New Product ...

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10th International Joint Conference on Mechanics, design Engineering and Advanced Manufacturing, JCM 2020

作者： Martin-Doñate, Cristina Lucena-Muñoz, Fermín García-Cabrera, Lina Guadalupe Mercado-Colmenero, Jorge Manuel Department of Engineering Graphics Design and Projects University of Jaén Campus Las Lagunillas s/n Jaen23071 Spain Department of Management Marketing and Sociology University of Jaen Campus Las Lagunillas s/n Jaen23071 Spain Department of Computer Sciences University of Jaen Campus Las Lagunillas s/n Jaen23071 Spain

ISBN: (纸本)9783030705657

The economic environment demands companies to be able of innovating and presenting new products and technologies. However, current industrial environments are composed of big established companies, small or medium family businesses and regional clusters. This business map does not comply with the dynamism required for detecting needs and proposals in form of new products that meet the current customer requirements. The creation of start-ups in the field of engineering is considered as a possibility to cover a growing market in designing high technological products. However, despite the importance and economic impact of the start-ups for less industrialized environments the courses in the engineering field do not include activities that contextualize theoretical knowledge and entrepreneurship. The paper presents the results of creating an entrepreneurial environment focused on the student as entrepreneurial unit. In this context, a series of new activities based on new design proposals have been developed on the basis of new technical solutions for industrial companies. The new designs have been presented as minimum viable products. The technical knowledge required for making the new designs has been complemented with entrepreneurial training. The results show an increase in students' willingness to create small companies based in new products as an employment option at the end of their studies. © 2021, The Author(s).

关键词： CAD Entrepreneurship Industrial design Product development

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Automatic Story Generation Based on Graph Model Using Godot Engine 19th

Automatic Story Generation Based on Graph Model Using Godot ...

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19th International Conference on Artificial Intelligence and Soft Computing, ICAISC 2020

作者： Grabska-Gradzińska, Iwona Nowak, Leszek Grabska, Ewa Department of Games Technology Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow Poland Department of Information Technologies Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow Poland Department of Design and Computer Graphics Faculty of Physics Astronomy and Applied Computer Science Jagiellonian University Krakow Poland

ISBN: (纸本)9783030614003

This paper deals with storytelling aspects of computer games. A new approach to automatic story generation based on graph modelling is proposed. Godot Engine for visualization of output stories is used. In our research the plot is represented by a specific graph called the layered graph composed of story building blocks, namely layer of locations, layer of characters, layer of items, layer of narration and plot dependencies. An appropriate set of graph rules (productions) stored in JSON format is a generative tool for the building blocks. Graph rules are internal representation of actions which can be taken by the hero of the story. A sequence of the rules from start to end can describe the whole gameplay of one player or can be generated in automatic way as a possible gameplay. All such sequences of the rules create the space of all potential gameplays. Every rule corresponds to a certain animation made in Godot Engine. It allows to visualize every possible story, represented by sequence of rules, by seamless animation. Given a rule, animation is based on graphic assets corresponding to the rule nodes of the layered graph. © 2020, Springer Nature Switzerland AG.

关键词： Animation

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Comparing bayesian models for organ contouring in headand neck radiotherapy

arXiv

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arXiv 2021年

作者： Mody, Prerak P. Chaves-De-Plaza, Nicolas Hildebrandt, Klaus van Egmond, René de Ridder, Huib Staring, Marius Department of Radiology Leiden University Medical Center Leiden Netherlands Computer Graphics and Visualization Lab TU Delft Delft Netherlands Industrial Design Engineering TU Delft Delft Netherlands

Deep learning models for organ contouring in radiotherapy are poised for clinical usage, but currently, there exist few tools for automated quality assessment (QA) of the predicted contours. Using Bayesian models and their associated uncertainty, one can potentially automate the process of detecting inaccurate predictions. We investigate two Bayesian models for auto-contouring, DropOut and FlipOut, using a quantitative measure – expected calibration error (ECE) and a qualitative measure – region-based accuracy-vs-uncertainty (R-AvU) graphs. It is well understood that a model should have low ECE to be considered trustworthy. However, in a QA context, a model should also have high uncertainty in inaccurate regions and low uncertainty in accurate regions. Such behaviour could direct visual attention of expert users to potentially inaccurate regions, leading to a speed-up in the QA process. Using R-AvU graphs, we qualitatively compare the behaviour of different models in accurate and inaccurate regions. Experiments are conducted on the MICCAI2015 Head and Neck Segmentation Challenge and on the DeepMindTCIA CT dataset using three models: DropOut-DICE, Dropout-CE (Cross Entropy) and FlipOut-CE. Quantitative results show that DropOut-DICE has the highest ECE, while Dropout-CE and FlipOut-CE have the lowest ECE. To better understand the difference between DropOut-CE and FlipOut-CE, we use the R-AvU graph which shows that FlipOut-CE has better uncertainty coverage in inaccurate regions than DropOut-CE. Such a combination of quantitative and qualitative metrics explores a new approach that helps to select which model can be deployed as a QA tool in clinical settings. © 2021, CC BY.

关键词： Entropy

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The 3D Trajectory-based Stress Visualizer

arXiv

引用

arXiv 2021年

作者： Wang, Junpeng Neuhauser, Christoph Wu, Jun Gao, Xifeng Westermann, Rüdiger The Computer Graphics & Visualization Group Technische Universität München Garching Germany The Department of Sustainable Design Engineering Delft University of Technology Delft Netherlands The Lightspeed & Quantum Studio Tencent America United States

We present the 3D Trajectory-based Stress Visualizer (3D-TSV), a visual analysis tool for the exploration of the principal stress directions in 3D solids under load. 3D-TSV provides a modular and generic implementation of key algorithms required for a trajectory-based visual analysis of principal stress directions, including the automatic seeding of space-filling stress lines, their extraction using numerical schemes, their mapping to an effective renderable representation, and rendering options to convey structures with special mechanical properties. In the design of 3D-TSV, several perceptual challenges have been addressed when simultaneously visualizing three mutually orthogonal stress directions via lines. We present a novel algorithm for generating a space-filling and evenly spaced set of mutually orthogonal lines. The algorithm further considers the locations of lines to obtain a more regular pattern repetition, and enables the extraction of a Focus+Context representation with user-selected levels of detail for individual stress directions. To further reduce visual clutter, the system provides the combined visualization of two selected principal directions via appropriately oriented ribbons. The rendering uses depth cues to better convey the spatial relationships between trajectories and improves ribbon rendering on steep angles. 3D-TSV is accessible to end users via a C++- and OpenGL-based rendering frontend that is seamlessly connected to a MATLAB-based extraction backend. A TCP/IP-based communication interface supports the flexible integration of alternative rendering frontends. The code (BSD license) of 3D-TSV is made publicly available. Copyright © 2021, The Authors. All rights reserved.

关键词： Stresses

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Creative graphic works of first-year students of Bachelors' degree of engineering educational program 2

Creative graphic works of first-year students of Bachelors' ...

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2nd International Scientific Conference on Metrological Support of Innovative Technologies, ICMSIT II-2021

作者： Mukhametzyanova, A.G. Bronskaya, V.V. Kharitonova, O.S. Department of Computer Graphics Engineering and Computer-Assisted Design Kazan National Research Technological University 68 Karl Marx Street Kazan420015 Russia Department of Chemical Process Engineering Kazan National Research Technological University 68 Karl Marx Street Kazan420015 Russia Department of Information Systems Kazan Federal University 35 Kremlyovskaya Street Kazan420008 Russia Department of Chemical Technology of Petroleum and Gas Processing Kazan National Research Technological University 68 Karl Marx Street Kazan420015 Russia

Such a form of organization of extracurricular work as a scientific circle is considered in this article. The purpose and content of the scientific circle on descriptive geometry, engineering and computer graphics are... 详细信息

关键词： computer graphics

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