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IEEE International Conference on Automation Science and Engineering (CASE)

作者： Ehtisham Lodhi Zeeshan Lodhi Zhu Fenghua Gang Xiong Feiyue Wang Waheed ur Rehman Tariku Sinshaw The SKL for Management and Control of Complex Systems Institute of Automation Chinese Academy of Sciences Beijing China School of Artificial Intelligence University of Chinese Academy of Sciences Beijing China Department of Electrical and Computer Engineering COMSATS University Islamabad Abbottabad Campus Pakistan Guangdong Engineering Research Center of 3D Printing and Intelligent Manufacturing Cloud Computing Center Chinese Academy of Sciences Dongguan Guangdong China Beijing Engineering Research Center of Intellectual System and Technology Chinese Academy of Sciences Beijing China College of Mechanical Engineering and Applied Electronics Technologies Beijing University of Technology Beijing China

ISBN: (数字)9781728169040

ISBN: (纸本)9781728169057

In modern era, one of the rising power quality (PQ) concern is harmonics distortion (Hd). The Hd is usually produced by increase in the utilization of nonlinear user loads at domestic level. It not only spoils the PQ but also have harmful effects on electrical appliances. So, this paper presents a new approach to mitigate the Hd in home appliances rapidly by utilizing the active band pass filter (ABPF). The fast Fourier transform (FFT) technique is employed for the detection of harmonics in appliances. The band pass filter dramatically affects the response time of active filter. The suggested control methodology is capable to eliminate harmonics from distorted input voltage waveform and provides a pure sinusoidal waveform. The prototype of this model is also implemented. Experimental results along with simulation show that the proposed model is quite effective in eliminating Hd despite load variations and also useful to compensate the reactive power in electronic home appliances. Hence, this technique is cost effective for domestic users with high quality performance in all aspects.

关键词： Power harmonic filters Harmonic analysis Band-pass filters Harmonic distortion Home appliances

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data Encoding in Lossless Prediction-Based Compression Algorithms

Data Encoding in Lossless Prediction-Based Compression Algor...

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IEEE International Conference on e-Science and Grid computing

作者： Ugur Cayoglu Frank Tristram Jörg Meyer Jennifer Schröter Tobias Kerzenmacher Peter Braesicke Achim Streit Steinbuch Centre for Computing Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Institute of Meteorology and Climate Research - Atmospheric Trace Gases and Remote Sensing Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Institute of Applied Physics (APH) - 3D Matter Made to Order (3DMM2O) Karlsruhe Institute of Technology Karlsruhe Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany Atmospheric Trace Gases and Remote Sensing Karlsruhe Institute of Technology Eggenstein-Leopoldshafen Germany

ISBN: (数字)9781728124513

ISBN: (纸本)9781728124520

The increase in compute power and development of sophisticated simulation models with higher resolution output triggers a need for compression algorithms for scientific data. Several compression algorithms are currently under development. Most of these algorithms are using prediction-based compression algorithms, where each value is predicted and the residual between the prediction and true value is saved on disk. Currently there are two established forms of residual calculation: Exclusive-or and numerical difference. In this paper we will summarize both techniques and show their strengths and weaknesses. We will show that shifting the prediction and true value to a binary number with certain properties results in a better compression factor with minimal additional computational costs. This gain in compression factor allows for the usage of less sophisticated prediction algorithms to achieve a higher throughput during compression and decompression. In addition, we will introduce a new encoding scheme to achieve an 9% increase in compression factor on average compared to the current state-of-the-art.

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Square Kilometre Array Science data Challenge 3a: foreground removal for an EoR experiment

arXiv

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arXiv 2025年

作者： Bonaldi, A. Hartley, P. Braun, R. Purser, S. Acharya, A. Ahn, K. Aparicio Resco, M. Bait, O. Bianco, M. Chakraborty, A. Chapman, E. Chatterjee, S. Chege, K. Chen, X. Chen, Z. Conaboy, L. Cruz, M. darriba, L. de Santis, M. denzel, P. diao, K. Feron, J. Finlay, C. Gehlot, B. Ghosh, S. Giri, S.K. Grumitt, R. Hong, S.E. Ito, T. Jiang, M. Jordan, C. Kim, S. Kim, M. Kim, J. Krishna, S.P. Kulkarni, A. López-Caniego, M. Labadie-García, I. Lee, H. Lee, d. Lee, N. Line, J. Liu, Y. Mao, Y. Mazumder, A. Mertens, F.G. Munshi, S. Nasirudin, A. Ni, S. Nistane, V. Norregaard, C. Null, d. Offringa, A. Oh, M. Oh, S.-H. Parkinson, d. Pritchard, J. Ruiz-Granda, M. Salvador López, V. Shan, H. Sharma, R. Trott, C. Yoshiura, S. Zhang, L. Zhang, X. Zheng, Q. Zhu, Z. Zuo, S. Akahori, T. Alberto, P. Allys, E. An, T. Anstey, d. Baek, J. Basavraj Brackenhoff, S. Browne, P. Ceccotti, E. Chen, H. Chen, T. Choudhuri, S. Choudhury, M. Coles, J. Cook, J. Cornu, d. Cunnington, S. das, S. de Lera Acedo, E. delouis, J.-M. deng, F. ding, J. Elahi, K.M.A. Fernandez, P. Fernández, C. Alcázar, A. Fernández Galluzzi, V. Gao, L.-Y. Garain, U. Garrido, J. Gendron-Marsolais, M.-L. Gessey-Jones, T. Ghorbel, H. Gong, Y. Guo, S. Hasegawa, K. Hayashi, T. Herranz, d. Holanda, V. Holloway, A.J. Hothi, I. Höfer, C. Jelić, V. Jiang, Y. Jiang, X. Kang, H. Kim, J.-Y. Koopmans, L.V. Lacroix, R. Lee, E. Leeney, S. Levrier, F. Li, Y. Liu, Y. Ma, Q. Meriot, R. Mesinger, A. Mevius, M. Minoda, T. Miville-deschenes, M.-A. Moldon, J. Mondal, R. Murmu, C. Murray, S. Nirmala, S.R. Niu, Q. Nunhokee, C. O’Hara, O. Pal, S.K. Pal, S. Park, J. Parra, M. Patra, N.N. Pindor, B. Remazeilles, M. Rey, P. Rubino-Martin, J.A. Saha, S. Selvaraj, A. Semelin, B. Shah, R. Shao, Y. Shaw, A.K. Shi, F. Shimabukuro, H. Singh, G. Sohn, B.W. Stagni, M. Starck, J.-L. Sui, C. Swinbank, J.d. Sánchez, J. SKA Observatory Jodrell Bank Lower Whitington MacclesfieldSK11 9FT United Kingdom Max-Planck Institute for Astrophysics Karl-Schwarzschild-Straße 1 Garching85748 Germany Department of Earth Sciences Chosun University Gwangju61452 Korea Republic of Universidad Europea de Madrid Madrid28670 Spain Observatoire de Sauverny Versoix1290 Switzerland Department of Physics Trottier Space Institute McGill University 3600 rue University MontréalQCH3A 2T8 Canada School of Physics and Astronomy The University of Nottingham University Park NottinghamNG7 2RD United Kingdom Department of Physics and Astronomy University of the Western Cape Cape Town Bellville7535 South Africa Kapteyn Astronomical Institute University of Groningen PO Box 800 Groningen9700 AV Netherlands Research Center for Astronomical Computing Zhejiang Laboratory Hangzhou311121 China National Astronomical Observatories Chinese Academy of Sciences Beijing100101 China Institute for Astronomy The University of Edinburgh Royal Observatory EdinburghEH9 3HJ United Kingdom Avda. de los Castros s/n SantanderE-39005 Spain Glorieta de la Astronomía s/n Granada18008 Spain Saint-Imier Switzerland Centre for Artificial Intelligence ZHAW Zurich University of Applied Sciences Technikumstrasse 71 Winterthur8400 Switzerland Department of Astronomy Tsinghua University Beijing100084 China Département de Physique Théorique Center for Astroparticle Physics Université de Geneve 24 quai Ernest Ansermet Geneve 41211 Switzerland Nordita KTH Royal Institute of Technology Stockholm University Hannes Alfv´ens väg 12 StockholmSE-106 91 Sweden Korea Astronomy and Space Science Institute Daejeon34055 Korea Republic of Astronomy Campus University of Science and Technology Daejeon34055 Korea Republic of Kumamoto University International Research Organization for Advanced Science and Technology 2-39-1 Kurokami Chuo-ku Kumamoto860-8555 Japan National Key Laboratory of Radar Signal Processing

We present and analyse the results of the Science data challenge 3a (SdC3a, https://***/challenges/ foregrounds), an EoR foreground-removal community-wide exercise organised by the Square Kilometre Array Observatory (SKAO). The challenge ran for 8 months, from March to October 2023. Participants were provided with realistic simulations of SKA-Low data between 106 MHz and 196 MHz, including foreground contamination from extragalactic as well as Galactic emission, instrumental and systematic effects. They were asked to deliver cylindrical power spectra of the EoR signal, cleaned from all corruptions, and the corresponding confidence levels. Here we describe the approaches taken by the 17 teams that completed the challenge, and we assess their performance using different metrics. The challenge results provide a positive outlook on the capabilities of current foreground-mitigation approaches to recover the faint EoR signal from SKA-Low observations. The median error committed in the EoR power spectrum recovery is below the true signal for seven teams, although in some cases there are some significant outliers. The smallest residual overall is 4.2+−204.2 × 10−4 K2h−3cMpc3 across all considered scales and frequencies. The estimation of confidence levels provided by the teams is overall less accurate, with the true error being typically underestimated, sometimes very significantly. The most accurate error bars account for 60 ± 20% of the true errors committed. The challenge results provide a means for all teams to understand and improve their performance. This challenge indicates that the comparison between independent pipelines could be a powerful tool to assess residual biases and improve error estimation. © 2025, CC BY.

关键词： Cosmology

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Construction of 3d Virtual Humans from 2d Images

Construction of 3D Virtual Humans from 2D Images

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IEEE International Conference on Networking, Sensing and Control

作者： Xiaojing Zhou Zhengxu Zhao School of instrument science and engineering South-East University Nanjing China Applied Computing and 3D Graphics School of Computing University of Derby Derby UK

Constructing highly realistic virtual human figures and simulating their motions are gaining real application ground in computer games and virtual reality (VR). This paper presents the construction of a 3d virtual human based on three 2d orthogonal images and a standard 3d human model template. The construction methods used are 1) extracting silhouettes of 2d images; 2) comparing discrepancies between the shapes of the template and the individual 2d orthogonal images; 3) deforming triangular mesh model of the template; 4) matching textures and skeleton system. Static and dynamic virtual human models generated via these methods have realistically modeled the shapes and clothes (texture) of 2d body images and simulated body actions based on relevant motion parameters.

关键词： Humans Biological system modeling Virtual reality Shape Computational modeling Computer simulation Application software Computer applications deformable models Skeleton

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A scalable avatar for conversational user interfaces

Lecture Notes in Artificial Intelligence (Subseries of Lectu...

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Lecture Notes in Artificial Intelligence (Subseries of Lecture Notes in Computer Science) 2003年 2615卷 350-359页

作者： Berner, Uwe Rieger, Thomas Technische Universität Darmstadt Interactive Graphics Systems Group 3D Graphics Computing Fraunhoferstraße 5 064283 Darmstadt Germany

Computers are becoming more and more ubiquitous, moving from the desktop into our everyday life. Today's challenge is to build a suitable visualization architecture for anthropomorphic conversational user interfaces which will run on different devices like laptops, PdAs and mobile phones. This new kind of interface will be adaptive to the current user, personal preferences, the history of the conversation, the device and the current context. Concrete implementations as a part of conversational interfaces are User-Interface Avatars, anthropomorphic representatives on the base of artificial 2d or 3d characters. The user can talk to an avatar on every device he is using. The avatar system is designed to exchange different graphical representations of the avatar easily. The existing system and ongoing work on optimization and Tenderers implementation are discussed. © Springer-Verlag Berlin Heidelberg 2003.

关键词： User interfaces

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Computer graphics in Germany

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Computer graphics (ACM) 2001年第3期35卷 14-21页

作者： Saupe, dietmar Alexa, Marc Chesnais, Alain Encarnação, Jose Institut für Informatik Universität Leipzig GRIS Technische Universität Darmstadt University of Leipzig Research Group on Computer Graphics and Image Processing Alias Wavefront 17 bis rue Joseph de Maistre 75018 Paris France Fraunhofer-Institut fuer Graphische Datenverarbeitung Wilhelminenstrasse 7 D-64283 Darmstadt Germany 3D Graphics Computing Department of Computer Science Technische Universität Darmstadt

The various institution and developments in the field of computer graphics in Germany is discussed. The German Research Foundation( dFG), as recognition of research in computer graphics, sponsors a special interdisciplinary graduates study program on 3d image analysis and synthesis at the University of Erlangen-Nuremburg. The German Association for Informatics, founded in 1983, brings together about 40 representatives from Universities, colleges and industry that co-ordinate activities form five subgroups specializing in foundations and systems, imaging and visualization, graphical user interfaces, simulation and animation, and geometric modeling. Several companies and forums working in the area of computer graphics are situated in darmstadt.

关键词： Computer graphics

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MIT educators share success

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Computer graphics (ACM) 2001年第1期35卷 20-23页

作者： Wolfe, Rosalee Belcher, John W. Mark Bessette, R. Massachusetts Institute of Technology Astrophysics Division MIT Physics Department Studio/TEAL Project MIT New England 3D Studio Max Users Group Physics Demonstration Group MIT Department of Physics Center for Space Research Massachusetts Institute of Technology Center for Educational Computing Initiatives Massachusetts Institute of Technology Division of Graphics and Human-Computer Interaction School of Computer Science Telecommunications and Information Systems DePaul University School of Computer Science DePaul University Chicago IL 60604

Professor John Belcher developed a series of short videos with animation and text of selected experiments to properly demonstrate the phenomena of electromagnetism. Such 3d animations are visually compelling, instilling in the student both a sense of wonder about the phenomena and a mental model of why and how it works. The products of these approach includes video clips of demonstrations, 3d animations of these demonstration which display time changing field-lines as a guide to understanding their dynamical effects and Java applets which allow the student to actively construct and animate 2d field lines for varying configurations of sources. These technologies are also implemented to develop animations for Faraday's insights, using video clips.

关键词： Computer graphics

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