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International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory (DIPED)

作者： Vitaliy Korendiy Oleksandr Kachur Viktor Zakharov Department of Technical Mechanics and Engineering Graphics Department of Computer-Aided Design Lviv Polytechnic National University Lviv Ukraine Department of Technical Mechanics and Engineering Graphics "Galca" Ltd Lviv Polytechnic National University Lviv Ukraine

Vibratory equipment is widely used in various fields of mechanical, industrial, and manufacturing engineering. Particularly, such machines can be effectively implemented while carrying out finishing technological operations, e.g., glazing, polishing, and lapping of different machine parts. The present paper is focused on developing the control system for the novel design of a vibratory lapping-polishing machine driven by six solenoids. The main purpose consists in providing the circular trajectory of the working member and ensuring the machining uniformity at each point of the surface being treated. In such a case, it is proposed to actuate the solenoids with the specified time shift depending on the forced frequency needed to be provided. The duration of the signal actuating the solenoid is equal to one-sixth of the total duration of a cycle (period) of the working body oscillation. The corresponding control approach is developed and simulated in the Tinkercad application, while the control system is designed based on the Arduino hardware and software. In addition, the laboratory prototype of the vibratory lapping-polishing machine and the corresponding control system are implemented in practice. The performed laboratory studies and experimental tests substantiate the possibilities of generating the circular oscillations of the working member of the vibration-driven lapping-polishing machine. The obtained results may be useful for engineers and technologists dealing with control systems of various vibratory technological equipment based on electromagnetic and solenoid-type drives.

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Fuzzy Model for the Analysis of Corporate Degradation in Crisis Conditions 25

Fuzzy Model for the Analysis of Corporate Degradation in Cri...

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25th International Conference on Soft Computing and Measurements, SCM 2022

作者： Nedosekin, Alexey O. Abdoulaeva, Zinaida I. Kurbanbaeva, Dinara F. Karpenko, Nadezhda A. LLC c-Finance Russia St. Petersburg Russia North-Western State Medical University Named after I. I. Mechnikov Department of Medical Informatics and Physics St. Petersburg Russia St. Petersburg State University of Film and Television Department of Computer Graphics and Design St. Petersburg Russia

ISBN: (数字)9781665496698

ISBN: (纸本)9781665496698

The paper presents a fuzzy model of corporate degradation, with the allocation of three sign levels of degradation. Each level of corporate degradation is represented by its quantitative and qualitative linguistic assessment. The following factors are used during the analysis: quick reinvestment ratio (QRIC), economic stability index (RI), level of equity of the organization. As a result statistical data are presented on the levels of corporate degradation within a group of 86 world largest industrial enterprises. Conclusion. It is necessary to learn how to link levels of corporate degradation with implicit factors of corporate culture (for example, presented. © 2022 IEEE.

关键词： Investments

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A Streamline-guided De-Homogenization Approach for Structural design

arXiv

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arXiv 2022年

作者： Wang, Junpeng Westermann, Rüdiger Wu, Jun Computer Graphics and Visualization Department of Informatics Technical University of Munich Garching 85748 Germany Department of Sustainable Design Engineering Delft University of Technology Delft2628 CE Netherlands

We present a novel de-homogenization approach for efficient design of high-resolution load-bearing structures. The proposed approach builds upon a streamline-based parametrization of the design domain, using a set of space-filling and evenly-spaced streamlines in the two mutually orthogonal direction fields that are obtained from homogenization-based topology optimization. Streamlines in these fields are converted into a graph, which is then used to construct a quad-dominant mesh whose edges follow the direction fields. In addition, the edge width is adjusted according to the density and anisotropy of the optimized orthotropic cells. In a number of numerical examples, we demonstrate the mechanical performance and regular appearance of the resulting structural designs, and compare them with those from classic and contemporary approaches. Copyright © 2022, The Authors. All rights reserved.

关键词： Structural design

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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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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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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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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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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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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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