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25th IEEE International Parallel and Distributed Processing Symposium, Workshops and Phd Forum, IPDPSW 2011

作者： Sandrieser, Martin Benkner, Siegfried Pllana, Sabri Department of Scientific Computing Faculty of Computer Science University of Vienna Austria

ISBN: (纸本)9780769543857

Heterogeneous many-core architectures offer a way to cope with energy consumption limitations of various computing systems from small mobile devices to large datacenters. However, programmers typically must consider a large diversity of architectural information to develop efficient software. In this paper we present our ongoing work towards a Platform Description Language (PDL) that enables to capture key architectural patterns of commonly used heterogeneous computing systems. PDL architecture patterns support programmers and toolchains by providing platform information in a well-defined and explicit manner. We have developed a source-to-source compiler that utilizes PDL descriptors to transform sequential task-based programs to a form that is convenient for execution on heterogeneous many-core computing systems. We show various usage scenarios of our PDL and demonstrate our approach for a commonly used scientific kernel. © 2011 IEEE.

关键词： Energy utilization

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Recognizing Hand Movements Using EEG-Signal Classification 11

Recognizing Hand Movements Using EEG-Signal Classification

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11th IEEE International Conference on Intelligent computing and Information Systems, ICICIS 2023

作者： Abdelhamid, Mohamed Mahmoud Wael Abdelmawgod, Amr Al-Metwally, Mohamed Tharwat Mohamed Hossien, Abdelrahman Shedeed, Howida A. Saeed Fouly, Eslam Naser, Aya Ain Shams University Faculty of Computer and Information Science Scientific Computing Department Cairo Egypt Ain Shams University Faculty of Computer and Information Science Scientific Computing Department Egypt

ISBN: (纸本)9798350322101

Classifying various precise manual movements based on electroencephalogram (EEG) signals presents an important research obstacle, particularly in the category of motor rehabilitation within brain-computer interface (BCI) applications. This study focuses on classifying EEG signals into six hand movement classes (forward, backward, up, down, right, left) utilizing machine learning and deep learning methods. The goal is to detect the person's current thoughts and intentions, including motor imagery and real movements, to assist individuals with physical disabilities or limb loss in controlling their robotic arms. After data collection and preprocessing, feature extraction is performed on the EEG signals obtained from the five signal bands (alpha, beta, theta, delta, gamma). Deep learning techniques include the use of recurrent neural networks with long short-term memory (RNN-LSTM) and convolutional neural networks (CNN), in addition to more traditional classifiers like Support Vector Machines (SVM) and Linear Discriminant Analysis (LDA), an overall best accuracy 70% is achieved in detecting the 6 hand movements classes from one subject. DWT with Logistic Regression, also CSP using SVM (one vs rest) achieved the same accuracy. EEG-Net also got 70% accuracy on the 6 classes. 93% accuracy is achieved for binary classification (2 classes) with CSP as a feature and Random Forest classifier also DWT using LSTM achieved the same accuracy using a 60-channel EEG system, the results that overcome the results from literature review on the same dataset. Cross subjects' technique is experimented also in this study. Using cross subjects' data from 4 classes, CSP using LSTM shows high accuracy of 61%. The use of a 60-channel EEG system and the adoption of deep learning techniques resulted in the best accuracy for hand movement recognition in this study. © 2023 IEEE.

关键词： Brain computer interface

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Orthogonality in Banach spaces and orthogonal multiscale L^1-approximation

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Chinese science Bulletin 1999年第1期44卷 25-35页

作者： YANG LihuaDepartment of scientific computing and computer Applications, School of Mathematics and computing science, Zhongshan (Sun Yatsen) University, Guangzhou 510275, China Institute of Mathematics, Chinese Academy of sciences, Beijing 100080, China Department of Scientific Computing and Computer Applications School of Mathematics and Computing Science Zhongshan (Sun Yatsen) University Guangzhou China Institute of Mathematics Chinese Academy of Sciences Beijing China

The orthogonality in Hilbert spaces is extended to the general Banach spaces and a concrete shift-invariant orthogonal family in L^1(R) is constructed. The corresponding projection approximation theorems and the algor... 详细信息

关键词： Banach spaces orthogonality approximation multiscale analysis.

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ANALYSIS AND SYNTHESIS OF RADIATE ACCRETIVE GROWTH IN 3 DIMENSIONS

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JOURNAL OF THEORETICAL BIOLOGY 1995年第1期175卷 39-55页

作者： KAANDORP, JA University of Amsterdam Parallel Scientific Computing and Simulation Group Faculty of Mathematics and Computer Science Kruislaan 403 1098 SJ Amsterdam The Netherlands

The growth forms of a series of samples of the sponge Haliclona oculata, collected along an environmental gradient, are compared to a series of three-dimensional simulated growth forms. In the series of three-dimensional objects the environmental gradient is simulated by gradually changing a model parameter that represents the capabilities of the transport system by which nutrients are transported through the sponge tissue. Actual and simulated forms are compared by applying methods from mathematical morphology. (C) 1995 Academic Press Limited

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HYPOTHETICAL C-100 MOLECULE AND DIAMOND-GRAPHITE INTERFACE - UNSTABLE AND METASTABLE STATES OF CARBON

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DIAMOND AND RELATED MATERIALS 1995年第4期4卷 528-531页

作者： LATHAM, CD HEGGIE, MI Scientific Computing Group Department of Computer Science Exeter University Exeter EX4 4PT UK

We summarise our ab initio calculations on diamond to date and their consequences for diamond film growth. Local spin density calculations on 50 and 62 atom clusters have given good estimates for hydrogenation reactions including activation energies and surface reconstructions. Larger calculations on the icosahedral, tetrahedrally bonded C-100 molecule reveal it should spontaneously decompose into two concentric fullerenes (C-20 and C-80). It is possible that a similar mechanism might cause graphitisation at a diamond asperity if hydrogen were not present, at least where a twin boundary meets the surface. However, the saturated, tetrahedrally bonded C100H60 molecule was found to be stable, elegantly illustrating one of the much discussed roles of hydrogen in diamond growth. We have tested the graphite-diamond interface model of Lambrecht et al. (Nature, 364 (1993) 607-610) and find the interface to be stable, but less so than their interatomic potential calculations suggested. We find some evidence for bond reconstruction and basal dislocation formation.

关键词： MODELING GROWTH MECHANISMS METASTABLE CARBON INTERFACES

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MatterChat: A Multi-Modal LLM for Material science

arXiv

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arXiv 2025年

作者： Tang, Yingheng Xu, Wenbin Cao, Jie Ma, Jianzhu Gao, Weilu Farrell, Steve Erichson, Benjamin Mahoney, Michael W. Nonaka, Andy Yao, Zhi Applied Mathematics and Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA United States National Energy Research Scientific Computing Center Lawrence Berkeley National Laboratory BerkeleyCA United States NSF National AI Institute for Student-AI Teaming University of Colorado at Boulder Boulder United States Institute for AI Industry Research Tsinghua University Beijing China Department of Electrical and Computer Engineering The University of Utah Salt Lake CityUT United States Scientific Data Division Lawrence Berkeley National Laboratory BerkeleyCA United States International Computer Science Institute BerkeleyCA United States Department of Statistics University of California at Berkeley BerkeleyCA United States

Understanding and predicting the properties of inorganic materials is crucial for accelerating advancements in materials science and driving applications in energy, electronics, and beyond. Integrating material structure data with language-based information through multi-modal large language models (LLMs) offers great potential to support these efforts by enhancing human–AI interaction. However, a key challenge lies in integrating atomic structures at full resolution into LLMs. In this work, we introduce MatterChat, a versatile structure-aware multi-modal LLM that unifies material structural data and textual inputs into a single cohesive model. MatterChat employs a bridging module to effectively align a pretrained machine learning interatomic potential with a pretrained LLM, reducing training costs and enhancing flexibility. Our results demonstrate that MatterChat significantly improves performance in material property prediction and human-AI interaction, surpassing general-purpose LLMs such as GPT-4. We also demonstrate its usefulness in applications such as more advanced scientific reasoning and step-by-step material synthesis. © 2025, CC BY.

关键词： Materials properties

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A class of multilevel recursive incomplete LU preconditioning techniques

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Journal of Applied Mathematics and computing 2001年第2期8卷 213-234页

作者： Zhang, Jun Laboratory for High Performance Scientific Computing and Computer Simulation Department of Computer Science University of Kentucky 773 Anderson Hall Lexington KY 40506-0046 United States

We introduce a class of multilevel recursive incomplete LU preconditioning techniques (RILUM) for solving general sparse matrices. This technique is based on a recursive two by two block incomplete LU factorization on the coefficient matrix. The coarse level system is constructed as an (approximate) Schur complement. A dynamic preconditioner is obtained by solving the Schur complement matrix approximately. The novelty of the proposed techniques is to solve the Schur complement matrix by a preconditioned Krylov subspace method. Such a reduction process is repeated to yield a multilevel recursive preconditioner. © 2001 Korean Society for Computational & Applied Mathematics and Korean SIGCAM.

关键词： Computational methods

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POST-DISASTER RECOLONIZATION of MANGROVE FORESTS with A STOCHASTIC AGENT-BASED MODEL

POST-DISASTER RECOLONIZATION of MANGROVE FORESTS with A STOC...

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2019 Geomatics and Data science: Towards Adaptive Management in a Changing World, PhilGEOS x GeoAdvances 2019

作者： Bongolan, V.P. Branzuela, J.E. Torres, G.M. Scientific Computing Laboratory Department of Computer Science University of the Philippines Diliman Philippines

Mangrove forests in the Philippine coastline are susceptible to severe damage due to tropical storms. These mangrove forests provide a home for other plants and animals as well as providing resources for people living in coastal areas. Thus, it is important to promote proper conservation and judicious replanting in areas affected by storms. Since different species vary on their tolerance to physical conditions such as water salinity and soil composition, the appropriate genus must be used in reforestation efforts. This study aims to model the change in soil composition due to the introduction of a non-native species, Rhizophora mucronata, and restoring soil condition to aid recolonization of the existing native species, Avicennia and Sonneratia. The study uses an agent-based model for the prediction of the regenerative behaviour of mangrove stands consisting of the native species and the planted or non-native species in a fragmented habitat, with the use of spatio-temporal coloured noise to simulate stochastic seedling dispersal and subject to storm damage. The model uses Salmo and Juanico's model for mangrove growth. Stochastic experiments were carried out in a shoreline habitat with an existing native population of varying ages and a larger population of planted, non-native seedlings. The GIS data of Bangrin Marine Protected Area was used to simulate the recovery trajectory of the stand after typhoon Chan-hom of 2009. © 2020 Authors.

关键词： Storms

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Optimization techniques and performance analyses of two life science algorithms for novel GPU architectures

Optimization techniques and performance analyses of two life...

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20th Euromicro International Conference on Parallel, Distributed and Network-Based Processing, PDP 2012

作者： Dilch, David Mehofer, Eduard Research Group Scientific Computing Faculty of Computer Science University of Vienna Austria

ISBN: (纸本)9780769546339

In this paper we evaluate two life science algorithms, namely Needleman-Wunsch sequence alignment and Direct Coulomb Summation, for GPUs. Whereas for Needleman-Wunsch it is difficult to get good performance numbers, Direct Coulomb Summation is particularly suitable for graphics cards. We present several optimization techniques, analyze the theoretical potential of the optimizations with respect to the algorithms, and measure the effect on execution times. We target the recent NVIDIA Fermi architecture to evaluate the performance impacts of novel hardware features like the cache subsystem on optimizing transformations. We compare the execution times of CUDA and OpenCL code versions for Fermi and predecessor models with parallel OpenMP versions executed on the main CPU. © 2012 IEEE.

关键词： Graphics processing unit

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A Fast Augmented Lagrangian Method for Euler’s Elastica Models

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Numerical Mathematics(Theory,Methods and Applications) 2013年第1期6卷 47-71页

作者： Yuping Duan Yu Wang Jooyoung Hahn Institute for Infocomm Research Singapore Computer Science Department TechnionHaifa 32000Israel Institute for Mathematics and Scientific Computing University of GrazAustria

In this paper,a fast algorithm for Euler’s elastica functional is proposed,in which the Euler’s elastica functional is reformulated as a constrained minimization *** the augmented Lagrangian method and operator splitting techniques,the resulting saddle-point problem is solved by a serial of *** tackle the nonlinear constraints arising in the model,a novel fixed-point-based approach is proposed so that all the subproblems either is a linear problem or has a closed-form *** show the good performance of our approach in terms of speed and reliability using numerous numerical examples on synthetic,real-world and medical images for image denoising,image inpainting and image zooming problems.

关键词： Euler’s elastica augmented Lagrangian method image denoising image inpainting image zooming

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