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arXiv 2025年

作者： Haubenwallner, Paul Heller, Matthias Fraunhofer Institute for Computer Graphics Research IGD Darmstadt Germany Technical University of Darmstadt Interactive Graphics Systems Group Darmstadt Germany

We present a fully numerical framework for the optimization of molecule-specific quantum chemical basis functions within the quantics tensor train format using a finite-difference scheme. The optimization is driven by solving the Hartree-Fock equations (HF) with the density-matrix renormalization group (DMRG) algorithm on Cartesian grids that are iteratively refined. In contrast to the standard way of tackling the mean-field problem by expressing the molecular orbitals as linear combinations of atomic orbitals (LCAO) our method only requires as much basis functions as there are electrons within the system. Benchmark calculations for atoms and molecules with up to ten electrons show excellent agreement with LCAO calculations with large basis sets supporting the validity of the tensor network approach. Our work therefore offers a promising alternative to well-established HF-solvers and could pave the way to define highly accurate, fully numerical, molecule-adaptive basis sets, which, in the future, could lead to benefits for post-HF calculations. Copyright © 2025, The Authors. All rights reserved.

关键词： Tensors

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Clustering Single-Cell RNA-seq Data: Impact of Data Binarization on Algorithmic Performance

Clustering Single-Cell RNA-seq Data: Impact of Data Binariza...

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18th International Joint Conference on Biomedical Engineering systems and Technologies, BIOSTEC 2025

作者： Widzisz, Karolina Kania, Mateusz Zyla, Joanna Polański, Andrzej Department of Computer Graphics Vision and Digital Systems Silesian University of Technology Akademicka 16 Gliwice Poland Department of Applied Informatics Silesian University of Technology Akademicka 16 Gliwice Poland Department of Data Science and Engineering Silesian University of Technology Akademicka 16 Gliwice Poland

The primary objective of this study was to test the hypothesis that the binary information on the presence or absence of gene expression can sufficiently capture the inherent heterogeneity within single-cell RNA se quencing (scRNA-seq) data. This hypothesis posits that even without detailed expression levels, valuable insights about cellular diversity can be obtained. Utilizing this method can be particularly advantageous when analyzing large datasets, a common scenario in the field of scRNA-seq. In this paper, we evaluate clustering performance and cluster separability of a variety of model-based algorithms and distance-based methods to an alyze both expression level data and threshold-encoded binarized data. We examined the performance of the Bernoulli-mixture model and Gaussian-mixture model. These were compared against traditional clustering techniques such as hierarchical clustering, K-means, and the Louvain algorithm on a range of scRNA-seq datasets. Our findings reveal that mixture models exhibit a lower dependence on the specific dataset compared to distance-based methods. Mixture models, particularly, demonstrate greater efficacy in accurately estimat ing the number of clusters present within the data. Among analyzed algorithms, the Bernoulli-mixture model stands out, outperforming distance-based approaches in several key aspects. Binary data, presence/absence of gene expression, seem to be indeed adequate to capture the heterogeneity of scRNA-seq data when clus tering with methods specifically designed for binary datasets. The implications of this finding are significant, as it opens up new possibilities for simplifying data analysis in scRNA-seq studies without compromising the accuracy of the results. © 2025 by SCITEPRESS– Science and Technology Publications, Lda.

关键词： Data accuracy

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A Hybrid Adaptive Filter for Head Tracking in Augmented Reality (AR)-based Flight Simulators

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IEEE Transactions on computers 2025年

作者： Nwobodo, Onyeka J. Kuaban, Godlove Suila Nkemeni, Valery Wereszczynski, Kamil Cyran, Krzysztof A. Silesian University of Technology Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Gliwice Poland Polish Academy of Sciences Institute of Theoretical and Applied Informatics Poland University of Buea Laboratory of Electrical Engineering and Computing Faculty of Engineering and Technology Buea Cameroon

This paper presents a novel approach for head tracking in augmented reality (AR) flight simulators using an adaptive fusion of Kalman and particle filters. This fusion dynamically balances the strengths of both algorithms, leveraging Kalman filters for computational efficiency and particle filters for handling non-linearities based on real-time factors such as sensor noise and head movement patterns. Our method demonstrates superior tracking precision and reduced latency, making it particularly effective for immersive pilot training in AR-based flight simulations. While focused on flight simulation, our approach holds high potential for broader applications in other AR and virtual reality (VR) environments where precise, real-time head tracking is crucial. These results provide actionable design guidance for developers optimizing tracking systems in environments that require fast response times and high accuracy. Future extensions of this research could explore the generalization of our approach across diverse AR applications, including human-computer interaction (HCI), medical simulations, and gaming. © 1968-2012 IEEE.

关键词： Flight simulators

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Spider: A high-speed network interconnect

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IEEE MICRO 1997年第1期17卷 34-39页

作者： Galles, M Silicon Graphics Computer Systems USA

The Spider chip, an interconnect for high-end networking applications, sustains a data transfer rate of 4.8 Gbytes/s, ether between chips in a single chassis or between remote chassis over cables up to 5 meters long.

关键词： Switching Networks Interconnects Interprocessor Communication SGI Spider Chip

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DESIGNING THE TFP MICROPROCESSOR

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IEEE MICRO 1994年第2期14卷 23-33页

作者： HSU, PY Silicon Graphics Computer Systems USA

Designed to efficiently support large, real-world, floating-point-intensive applications, the TFP (short for Tremendous Floating-Point) microprocessor is a superscalar implementation of the Mips Technologies architecture. This floating-point, computation-oriented processor uses a superscalar machine organization that dispatches up to four instructions each clock cycle to two floating-point execution units, two memory load/store units, and two integer execution units. Its split-level cache structure reduces cache misses by directing integer data references to a 16-Kbyte on-chip cache, while channeling floating-point data references off chip to a 4-Mbyte cache.

关键词： Microprocessors Supercomputers Workstations Bandwidth Delay Network servers computer architecture computer aided instruction Clocks Costs

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HARDWARE ACCELERATOR PICKS UP THE PACE ACROSS FULL DESIGN CYCLE

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ELECTRONIC DESIGN 1985年第24期33卷 177-&页

作者： AZAR, C BUTTS, M Mentor Graphics Corp Computer Systems Div Beaverton OR USA Mentor Graphics Corp Computer Systems Div Beaverton OR USA

Designers using CAE workstations often feel as if they are stuck in stop-and-go traffic. Some steps, like entering a schematic, move along briskly. Others, say, simulating a circuit and checking its design rules, slow progress to a crawl because of the requisite computing time and muscle. True, hardware accelerators have helped unsnarl the simulation tie-up, but until now none has attempted to boost throughput across the full design cycle - from schematic entry to prototype testing. Rather than concentrate on a single step, a workstation accelerator brings its interactive approach to bear on the whole design cycle.

关键词： computerS

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Analysis of a parallel volume rendering system based on the shear-warp factorization

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IEEE TRANSACTIONS ON VISUALIZATION AND computer graphics 1996年第3期2卷 218-231页

作者： Lacroute, P Silicon Graphics Computer Systems Mountain view CA USA

This paper presents a parallel volume rendering algorithm that can render a 256 x 256 x 225 voxel medical data set at over 15 Hz and a 512 x 512 x 334 voxel data set at over 7 Hz on a 32-processor Silicon graphics Challenge. The algorithm achieves these results by minimizing each of the three components of execution time: computation time, synchronization time, and data communication time. Computation time is low because the parallel algorithm is based on the recently-reported shear-warp serial volume rendering algorithm which is over five times faster than previous serial algorithms. The algorithm uses run-length encoding to exploit coherence and an efficient volume traversal to reduce overhead. Synchronization time is minimized by using dynamic load balancing and a task partition that minimizes synchronization events. Data communication costs are low because the algorithm is implemented for shared-memory multiprocessors, a class of machines with hardware support for low-latency fine-grain communication and hardware caching to hide latency. We draw two conclusions from our implementation. First, we find that on shared-memory architectures data redistribution and communication costs do not dominate rendering time. Second, we find that cache locality requirements impose a limit on parallelism in volume rendering algorithms. Specifically, our results indicate that shared-memory machines with hundreds of processors would be useful only for rendering very large data sets.

关键词： volume rendering parallel algorithms for shared memory multiprocessors shear-warp factorization coherence optimizations image partition multiprocessor performance analysis

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Intraoperative perfusion assessment by continuous, low-latency hyperspectral light-field imaging: development, methodology, and clinical application 23

Intraoperative perfusion assessment by continuous, low-laten...

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Advanced Biomedical and Clinical Diagnostic and Surgical Guidance systems XXIII 2025

作者： Kray, Stefan Schmid, Andreas Wisotzky, Eric L. Gerlich, Moritz Apweiler, Sebastian Hilsmann, Anna Greiner, Thomas Eisert, Peter Kneist, Werner Institute of Smart Systems and Services Pforzheim University Pforzheim Germany Computer Vision & Graphics Vision & Imaging Technologies Fraunhofer Heinrich-Hertz-Institute HHI Berlin Germany Humboldt-University Berlin Germany Department of General- Visceral- and Thoracic Surgery Klinikum Darmstadt GmbH Darmstadt Germany

ISBN: (纸本)9781510683600

Accurate assessment of tissue perfusion is crucial in visceral surgery, especially during anastomosis. Currently, subjective visual judgment is commonly employed in clinical settings. Hyperspectral imaging (HSI) offers a non-invasive, quantitative alternative. However, HSI imaging lacks continuous integration into the clinical workflow. This study presents a hyperspectral light field system for intraoperative tissue oxygen saturation (SO2) analysis and visualization. We present a correlation method for determining SO2 saturation with low computational demands. We demonstrate clinical application, with our results aligning with the perfusion boundaries determined by the surgeon. We perform and compare continuous perfusion analysis using two hyperspectral cameras (Cubert S5, Cubert X20), achieving processing times of © 2025 SPIE.

关键词： Cameras Surgery Oxygenation Hyperspectral imaging Tissues Reflectivity Resection Perfusion imaging Visualization Image segmentation

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Design environment for the '90s

Design News (Boston)

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Design News (Boston) 1990年第10期46卷 66-67,69页

作者： Witwer, Jeffrey G. Silicon Graphics Computer Systems United States

The 1990s will be a period of revolutionary change for manufacturing firms competing at the world-class level. Global competition will force them to rely increasingly on mechanical design automation tools. graphics tools provide realistic, dynamic displays and eliminate the need for the design artifacts that add no value to the product, but add tremendous cost to development. New software and hardware tools promise to focus purely on product design and less on artifacts.

关键词： computer Aided Design

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4D-MP graphics SUPERWORKSTATION: COMPUTING plus graphics equals 40 MIPS plus MFLOPS AND 100,000 LIGHTED POLYGONS PER SECOND.

4D-MP GRAPHICS SUPERWORKSTATION: COMPUTING plus GRAPHICS equ...

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Digest of Papers - Compcon Spring 88: Intellectual Leverage, Thirty-Third IEEE computer Society International Conference.

作者： Baskett, Forest Jermoluk, Tom Solomon, Doug Silicon Graphics Computer Systems Silicon Graphics Computer Systems

ISBN: (纸本)0818608285

The 4D-MP graphics superworkstation, which brings 40 MIPS (million instructions per second) of computing performance to a graphics superworkstation is described. It also delivers 40 MFLOPS (million floating-point operations, is described per second) of geometry processing performance, enabling 100,000 lighted, four-sided, concave-tested polygons to be processed per second. This level of computing and graphics processing in an office-environment workstation is made possible by using the fastest available RISC (reduced-instruction-set computer) microprocessors in a single shared-memory multiprocessor design driving a tightly coupled, highly parallel graphics system. Aggregate sustained data rates of greater than 1 Gbyte/s are achieved by a hierarchy of buses in a balanced system designed to avoids bottlenecks.

关键词： computer graphics

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