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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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Realistic Haptic Feedback for Material Removal in Medical Simulations

Realistic Haptic Feedback for Material Removal in Medical Si...

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International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (HAPTICS)

作者： Maximilian Kaluschke René Weller Niels Hammer Luigi Pelliccia Mario Lorenz Gabriel Zachmann Institute for Computer Graphics and Virtual Reality University of Bremen Department of Orthopedics University Hospital Leipzig Professorship Machine Tool Design and Forming Technology Chemnitz University of Technology

ISBN: (数字)9781728102344

ISBN: (纸本)9781728102351

We present a novel haptic rendering method to simulate material removal in medical simulations at haptic rates. The core of our method is a new massively-parallel continuous collision detection algorithm in combination with a stable and flexible 6-DOF collision response scheme that combines penalty- and constraint-based force computation. Moreover, a volumetric object representation of the 3D objects allows us to derive a realistic local material model from experimental human cadaveric data, as well as support real-time continuous material removal. We have applied our algorithm to a hip replacement simulator and two dentistry-related simulations for root-canal opening and caries removal. The results show realistic continuous forces and torques at haptic rates.

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Nobel hopes competition as a means of developing the cognitive interest of students 1

Nobel hopes competition as a means of developing the cogniti...

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1st International Scientific Conference on Advances in Science, Engineering and Digital Education, ASEDU 2020

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 Chemical Technology of Petroleum and Gas Processing Kazan National Research Technological University 68 Karl Marx Street Kazan420015 Russia

The importance of carrying competitions among students of general education institutions and the effectiveness of these activities as a means of developing the cognitive interest of students are shown. The article describes the experience of carrying competitions among schoolchildren and students of colleges, accumulated in the Kazan National Research Technological University. It is shown that these activities allow to reveal the creative potential of participants, and form the interest in engineering and design activities, which subsequently affects the choice of school leavers who are in demand in the modern labour market of specialties and professions. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： Students

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Robust computation of subcortical functional connectivity guided by quantitative susceptibility mapping: An application in Parkinson's disease diagnosis

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NeuroImage 2025年 314卷 121256-121256页

作者： Qin, Jianmei Wu, Haoting Wu, Chenqing Guo, Tao Zhou, Cheng Duanmu, Xiaojie Tan, Sijia Wen, Jiaqi Zheng, Qianshi Yuan, Weijin Zhu, Zihao Chen, Jingwen Wu, Jingjing He, Chenyu Ma, Yiran Liu, Chunlei Xu, Xiaojun Guan, Xiaojun Zhang, Minming Department of Radiology the Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China Joint Laboratory of Clinical Radiology the Second Affiliated Hospital Zhejiang University School of Medicine Hangzhou China State Key Laboratory of Computer-aided Design & Computer Graphics Zhejiang University College of Computer Science and technology Hangzhou China State Key Laboratory of Industrial Control Technology Zhejiang University College of Control Science and Engineering Hangzhou China Department of Electrical Engineering and Computer Sciences University of California Berkeley CA United States Helen Wills Neuroscience Institute University of California Berkeley CA United States

Previous resting state functional MRI (rs-fMRI) analyses of the basal ganglia in Parkinson's disease heavily relied on T1-weighted imaging (T1WI) atlases. However, subcortical structures are characterized by subtle contrast differences, making their accurate delineation challenging on T1WI. In this study, we aimed to introduce and validate a method that incorporates quantitative susceptibility mapping (QSM) into the rs-fMRI analytical pipeline to achieve precise subcortical nuclei segmentation and improve the stability of RSFC measurements in Parkinson's disease. A total of 321 participants (148 patients with Parkinson's Disease and 173 normal controls) were enrolled. We performed cross-modal registration at the individual level for rs-fMRI to QSM (FUNC2QSM) and T1WI (FUNC2T1), *** consistency and accuracy of resting state functional connectivity (RSFC) measurements in two registration approaches were assessed by intraclass correlation coefficient and mutual information. Bootstrap analysis was performed to validate the stability of the RSFC differences between Parkinson's disease and normal controls. RSFC-based machine learning models were constructed for Parkinson's disease classification, using optimized hyperparameters (RandomizedSearchCV with 5-fold cross-validation). The consistency of RSFC measurements between the two registration methods was poor, whereas the QSM-guided approach showed better mutual information values, suggesting higher registration accuracy. The disruptions of RSFC identified with the QSM-guided approach were more stable and reliable, as confirmed by bootstrap analysis. In classification models, the QSM-guided method consistently outperformed the T1WI-guided method, achieving higher test-set ROC-AUC values (FUNC2QSM: 0.87–0.90, FUNC2T1: 0.67–0.70). The QSM-guided approach effectively enhanced the accuracy of subcortical segmentation and the stability of RSFC measurement, thus facilitating future biomarker development in Parkinso

关键词： Parkinson's disease Quantitative susceptibility mapping Resting-state functional connectivity Subcortical nuclei

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Phoenixmap: An abstract approach to visualize 2D spatial distributions

arXiv

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arXiv 2020年

作者： Zhao, Junhan Liu, Xiang Guo, Chen Qian, Zhenyu Cheryl Chen, Yingjie Victor Department of Computer Graphics Technology Purdue University West LafayetteIN47907 United States Department of Computer and Information Technology Purdue University West LafayetteIN47907 United States School of Media Arts and Design James Madison University HarrisonburgVA22807 United States Department of Art and Design Purdue University West LafayetteIN47907 United States

The multidimensional nature of spatial data poses a challenge for visualization. In this paper, we introduce Phoenixmap, a simple abstract visualization method to address the issue of visualizing multiple spatial distributions at once. The Phoenixmap approach starts by identifying the enclosed outline of the point collection, then assigns different widths to outline segments according to the segments' corresponding inside regions. Thus, one 2D distribution is represented as an outline with varied thicknesses. Phoenixmap is capable of overlaying multiple outlines and comparing them across categories of objects in a 2D space. We chose heatmap as a benchmark spatial visualization method and conducted user studies to compare performances among Phoenixmap, heatmap, and dot distribution map. Based on the analysis and participant feedback, we demonstrate that Phoenixmap 1) allows users to perceive and compare spatial distribution data efficiently;2) frees up graphics space with a concise form that can provide visualization design possibilities like overlapping;and 3) provides a good quantitative perceptual estimating capability given the proper legends. Finally, we discuss several possible applications of Phoenixmap and present one visualization of multiple species of birds' active regions in a nature preserve. Copyright © 2020, The Authors. All rights reserved.

关键词： Data visualization

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Single trial ERP amplitudes reveal the time course of acquiring representations of novel faces in individual participants

arXiv

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arXiv 2020年

作者： Sommer, Werner Stapor, Katarzyna Kończak, Grzegorz Kotowski, Krzysztof Fabian, Piotr Ochab, Jeremi Bereś, Anna Ślusarczyk, Grażyna Humboldt-University at Berlin Department of Psychology Germany Silesian University of Technology Institute of Computer Science Gliwice Poland University of Economics in Katowice Department of Statistics Econometrics and Mathematics Poland Silesian University of Technology Department of Applied Informatics Gliwice Poland Silesian University of Technology Department of Algorithmics and Software Gliwice Poland Jagiellonian University Department of Theory of Complex Systems Krakow Poland Jagiellonian University Department of Cognitive Neuroscience and Neuroergonomics Krakow Poland Jagiellonian University Department of Design and Computer Graphics Krakow Poland Institut für Psychologie Humboldt-Universität zu Berlin Rudower Chaussee 18 Berlin12489 Germany Faculty of Automatic Control Electronics and Computer Science Department of Applied Informatics Silesian University of Technology Akademicka 16 Gliwice44-100 Poland

The neural correlates of face individuation – the acquisition of memory representations for novel faces – have been studied only in coarse detail and disregarding individual differences between learners. In their seminal study, (Tanaka, Curran, Porterfield, & Collins, 2006) required the identification of a particular novel face across 70 trials and found that the N250 component in the ERP became more negative from the first to the second half of the experiment, where it reached a similar amplitude as a well-known face. We were unable to directly replicate this finding in our study when we used the original spilt of trials. However, when we applied a different split of trials we observed very similar changes in N250 amplitude. Then, we developed and applied a new two-step explorative-confirmative non-parametric method based on permutation testing to determine the time course of face individuation in individual participants based on single trial N250 amplitudes. We show that the assumption of a steep initial increase of N250 amplitude across multiple presentations of the target face, followed by a plateau, yields plausible results in fitting linear trends for most participants. The transition point from initial acquisition to the plateau phase differed strongly between participants and tended to be earlier when performance in target face recognition was better. Hence, face individuation may be accounted for by a biphasic process of early, fast acquisition, followed by a slower, asymptotic consolidation or maintenance phase. The current approach might be fruitfully applied to further investigations into face individuation and their neural correlates. © 2020, CC BY-NC-ND.

关键词： Face recognition

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

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Journal of Physics: Conference Series 2021年第2期1889卷

作者： A G Mukhametzyanova V V Bronskaya O S Kharitonova Department of Computer Graphics Engineering and Computer-Assisted Design Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 Russia Department of Chemical Process Engineering Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 Russia Department of Information Systems Kazan Federal University 35 Kremlyovskaya Street Kazan 420008 Russia Department of Chemical Technology of Petroleum and Gas Processing Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 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...

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Nobel hopes competition as a means of developing the cognitive interest of students

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Journal of Physics: Conference Series 2020年第1期1691卷

作者： A G Mukhametzyanova V V Bronskaya O S Kharitonova Department of Computer Graphics Engineering and Computer-Assisted Design Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 Russia Department of Chemical Process Engineering Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 Russia Department of Chemical Technology of Petroleum and Gas Processing Kazan National Research Technological University 68 Karl Marx Street Kazan 420015 Russia

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Research on the effect of visual conventions on perception and inference 6th

Research on the effect of visual conventions on perception a...

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6th International Conference on design, User Experience, and Usability, DUXU 2017, held as part of the 19th International Conference on Human-computer Interaction, HCI 2017

作者： Peng, Ningyue Xue, Chengqi Wang, Haiyan Niu, Yafeng Chen, Yingjie Victor School of Mechanical Engineering Southeast University Nanjing China Institute of Product Design and Reliability Engineering Southeast University Nanjing China Department of Computer Graphics Technology in Purdue Polytechnic Institute Purdue University IN United States

ISBN: (纸本)9783319586335

Visual conventions are perceptually efficient graphic agreements with common-sense like referents and are commonly used in what we interact with in daily life. It becomes a studying-worthy issue on whether such conventions can enhance performances and reduce cognitive load when we perceive and reason about new knowledge. Furthermore, whether the visual conventions can affect experts, who have prior knowledge and design experience about different visual encoding principles the same degree as novice who have no background knowledge in this area, is another research focus in this study. Our research is carried out according to action features when we read visualizations. Four task features are extracted, based on which behavioral and eye-tracking measurement were conducted, that is data localization, simple and complex data comparison, and knowledge inference. Both expert and novice participants were enrolled in our experiment. The result indicates that conventional elements in visualizations can hugely improve performances in more complex tasks involving higher-level cognition, like making comparisons and reasoning about new knowledge. The performance improvement can be seen from shorter response time on achieving conclusions and higher accuracy rates. Meanwhile, cognitive load, which can be measured from shorter total fixation duration and fewer fixation counts in AOIs, is reduced through applying visually conventional features. No statistically significant difference is found in comparing perceptual and inferential outputs of expert and novice group. We draw conclusions that visual conventions in visualizations can better performance in relatively complex activities, and it can be equally perceived and acquired regardless of the user’s knowledge background is. What we conclude in this study can be extended to areas of dynamic data visualization and layout design in the digital interface domain. © Springer International Publishing AG 2017.

关键词： Visualization

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The interactive image: A media archaeology approach

The interactive image: A media archaeology approach

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ACM SIGGRAPH 2017 Art Gallery - International Conference on computer graphics and Interactive Techniques, SIGGRAPH 2017

作者： Bravo, Esteban García Burbano, Andrés Byrd, Vetria L. Forbes, Angus G. Purdue University Department of Computer Graphics Technology West LafayetteIN47907 United States Universidad de Los Andes Department of Design Cra 1 No. 18A-12 Bogotá111711 Colombia University of Illinois at Chicago Electronic Visualization Laboratory Department of Computer Science M/C 152 851 S Morgan Room 1120 ChicagoIL60607 United States

ISBN: (纸本)9781450349987

This paper examines the history of the influential Interactive Image computer graphics showcase, which took place at museum and conference venues from 1987 to 1988. The authors present a preliminary exploration of the historical contexts that led to the creation of this exhibition by the Electronic Visualization Lab (EVL), which included the integrated efforts of both artists and computer scientists. In addition to providing historical details about this event, the authors introduce a media archaeology approach for examining the cultural and technological contexts in which this event is situated. © 2017 Esteban García Bravo, Andr's Burbano, Vetria L. Byrd, Angus G. Forbes.

关键词： Exhibitions

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