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A class of multilevel recursive incomplete LU preconditioning techniques

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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Superconductivity in tin telluride films grown by molecular beam epitaxy

arXiv

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arXiv 2025年

作者： Gonzalez, Antonio Poage, Samuel J. Langa, Bernardo Sapkota, Deepak Salmani-Rezaie, Salva Chikara, Shalinee Williams, Michael D. Muller, David A. Sardashti, Kasra Ahadi, Kaveh Department of Materials Science and Engineering North Carolina State University RaleighNC27695 United States Department of Physics and Astronomy Clemson University ClemsonSC29634 United States School of Applied and Engineering Physics Cornell University IthacaNY14853 United States Kavli Institute Cornell for Nanoscale Science Cornell University IthacaNY14853 United States National High Magnetic Field Laboratory TallahasseeFL32310 United States Department of Physics Clark Atlanta University AtlantaGA30314 United States Department of Electrical and Computer Engineering The Ohio State University ColumbusOH43210 United States Department of Materials Science and Engineering The Ohio State University ColumbusOH43210 United States

The intersection of superconductivity and ferroelectricity hosts a wide range of exotic quantum phenomena. Here, we report on the observation of superconductivity in high-quality tin telluride films grown by molecular beam epitaxy. Unintentionally doped tin telluride undergoes a ferroelectric transition at ~100 K. The critical temperature of superconductivity increases monotonically with indium concentration. The critical field of superconductivity, however, does not follow the same behavior as critical temperature with indium concentration and exhibits a carrier-density-dependent violation of the Pauli limit. The electron-phonon coupling, from the McMillan formula, exhibits a systematic enhancement with indium concentration, suggesting a potential violation of BCS weak coupling at high indium concentrations. © 2025, CC BY.

关键词： Ferroelectricity

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Topology-aware virtual network embedding based on closeness centrality

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Frontiers of computer science 2013年第3期7卷 446-457页

作者： Zihou WANG Yanni HAN Tao LIN Yuemei XU Song CI Hui TANG High Performance Network Laboratory Institute of Acoustics Chinese Academy of Sciences Beijing 100190 China Department of Computer and Electronics Engineering University of Nebraska-Lincoln NE 68182 USA

Network virtualization aims to provide a way to overcome ossification of the Internet. However, making efficient use of substrate resources requires effective techniques for embedding virtual networks： mapping virtual nodes and virtual edges onto substrate networks. Previous research has presented several heuristic algorithms, which fail to consider that the attributes of the substrate topology and virtual net- works affect the embedding process. In this paper, for the first time, we introduce complex network centrality analysis into the virtual network embedding, and propose virtual network embedding algorithms based on closeness centrality. Due to considering of the attributes of nodes and edges in the topology, our studies are more reasonable than existing work. In addition, with the guidance of topology quantitative evalua- tion, the proposed network embedding approach largely improves the network utilization efficiency and decreases the embedding complexity. We also investigate our algorithms on real network topologies （e.g., AT＆T, DFN） and random network topologies. Experimental results demonstrate the usability and capability of the proposed approach.

关键词： network virtualization virtual network embedding complex networks closeness centrality

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Using a performance-based skeleton to implement divisible load applications on grid computing environments

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Journal of Information science and engineering 2009年第1期25卷 59-81页

作者： Shih, Wen-Chung Yang, Chao-Tung Tseng, Shian-Shyong Department of Information Science and Applications Asia University Taichung 413 Taiwan High-Performance Computing Laboratory Department of Computer Science and Information Engineering Tunghai University Taichung 407 Taiwan Department of Computer Science National Chiao Tung University Hsinchu 300 Taiwan

Applications with divisible loads have such a rich source of parallelism that their parallelization can significantly reduce their total completion time on grid computing environments. However, it is a challenge for grid users, probably scientists and engineers, to develop their applications which can exploit the computing power of the grid. We propose a performance-based skeleton algorithm for implementing divisible load applications on grids. Following this skeleton, novice grid programmers can easily develop a high performance grid application. To examine the performance of programs developed by this approach, we apply this skeleton to implement three kinds of applications and conduct experiments on our grid test-bed. Experimental results show that programs implemented by this approach run more rapidly than those using conventional scheduling schemes.

关键词： Grid computing

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SQLS:A Storm-Based Query Language System for Real-Time Stream Data Analysis

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Chinese Journal of Electronics 2016年第6期25卷 1025-1033页

作者： JI Yimu ZHANG Dianchao SUN Yanfei ZHAO Chuanxin HE Jing WANG Ruchuan CHEN Guoliang Computer of Science Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Laboratory of Computer Network and Information Integration Southeast University Key Laboratory of Intelligent Perception and Systems for High-Dimensional Information of Ministry of Education Nanjing University of Science and Technology Computer of Telecommunications Nanjing University of Posts and Telecommunications Department of Computer Anhui Normal University Engineering and Science Victoria University

In this work, a Storm-based query language System(SQLS) is proposed for real-time data stream analysis. The system is compatible with Continuous query language(CQL) specification. It supports both continuous queries and one-time queries over streaming data, and meets the requirements of user experience(traditional SQL queries) and Qo S(such as real-time and throughput). In order to better meet the requirement of throughput and enhance the processing efficiency, the load shedding algorithm and cache optimization are employed during the implementation of SQL-like operators. Finally, performance testing of the proposed SQLS has been conducted on standalone Storm platform and Storm clusters. Experimental results show that our system can not only meet the needs of users, but also extend the function of real-time streaming queries processing.

关键词： Continuous query Ad hoc query Storm CQL Real-time query processing

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Optimization of a global seventh-order dissipative compact finite-difference scheme by a genetic algorithm

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Applied Mathematics and Mechanics(English Edition) 2018年第11期39卷 1679-1690页

作者： Yu LIN Yaming CHEN Chuanfu XU Xiaogang DENG College of Computer National University of Defense Technology College of Aerospace Science and Engineering National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology

A global seventh-order dissipative compact finite-difference scheme is optimized in terms of time stability. The dissipative parameters appearing in the boundary closures are assumed to be different, resulting in an optimization problem with several parameters determined by applying a generic algorithm. The optimized schemes are analyzed carefully from the aspects of the eigenvalue distribution, the ε-pseudospectra, the short time behavior, and the Fourier analysis. Numerical experiments for the Euler equations are used to show the effectiveness of the final recommended scheme.

关键词： high-order dissipative compact finite-difference scheme genetic algorithm time stable

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On construction of a BioGrid platform for parallel bioinformatics applications

Proceedings of the ACM Symposium on Applied Computing

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Proceedings of the ACM Symposium on Applied Computing 2007年 144-145页

作者： Yang, Chao-Tung Han, Tsu-Fen Kan, Heng-Chuan High Performance Computing Laboratory Department of Computer Science and Information Engineering Tunghai University Taichung 40704 Taiwan Southern Business Unit National Center for High-performance Computing Hsinshi Tainan County 74147 Taiwan

ISBN: (纸本)1595934804;9781595934802

In this paper, we report on implementing an experimental distributed computing application for bioinformatics consisting of basic high-performance computing environments (Grid and PC Cluster systems), multiple interfaces at user portals that provide useful graphical interfaces to enable biologists who are not IT specialists to benefit directly from the use of high-performance technology. Copyright 2007 ACM.

关键词： Bioinformatics

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performance evaluation of a hybrid wireless network architecture for rural communication

Performance evaluation of a hybrid wireless network architec...

引用

7th IEEE International Conference on Personal Wireless Communications, ICPWC 2005

作者： Balaji, K. Hegde, N. Venkata Ramana, B. Manoj, B.S. Siva Ram Murthy, C. High Performance Computing and Networking Laboratory Department of Computer Science and Engineering IIT Madras 600036 India

In this paper, we evaluate the performance of Meghadoot - a packet based wireless mesh network architecture for low cost rural community networks. Meghadoot is designed for rural community networks as an alternative for the single-hop last mile. We have built a prototype network for Meghadoot architecture and studied the impact of multi-hop relaying and constrained devices on end-to-end throughput. The experimental results show that in certain situations multi-hop last mile improves performance in addition to the enhanced coverage and also the presence of constrained nodes brings down the performance drastically. ©2005 IEEE.

关键词： Wireless telecommunication systems

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On Rank Factorizations and Factor Prime Factorizations for Multivariate Polynomial Matrices

引用

Journal of Systems science & Complexity 2018年第6期31卷 1647-1658页

作者： GUAN Jiancheng LI Weiqing OUYANG Baiyu College of Mathematics and Computer Science Key Laboratory of High Performance Computing and Stochastic Information Processing (Ministry of Education of China)Hunan Normal UniversityChangsha 410081China Department of Mathematics Xiangnan UniversityChenzhou 423000China College of Mathematics and Computer Science Key Laboratory of High Performance Computing and Stochastic Information Processing (Ministry of Education of China)Hunan Normal UniversityChangsha 410081China

In this paper,rank factorizations and factor left prime factorizations are *** authors prove that any polynomial matrix with full row rank has factor left prime *** for a class of polynomial matrices,the authors give an algorithm to decide whether they have rank factorizations or factor left prime factorizations and compute these factorizations if they exist.

关键词： Factor prime factorizations multivariate polynomial matrices rank factorizations

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Quantum oscillations of holes in GaN

arXiv

引用

arXiv 2025年

作者： Chang, Chuan F.C. Dill, Joseph E. Zhang, Zexuan Chen, Jie-Cheng Pieczulewski, Naomi Bader, Samuel J. Valenzuela, Oscar Ayala Crooker, Scott A. Balakirev, Fedor F. McDonald, Ross D. Encomendero, Jimy Muller, David A. Giustino, Feliciano Jena, Debdeep Xing, Huili Grace Department of Physics Cornell University IthacaNY United States School of Applied and Engineering Physics Cornell University IthacaNY United States School of Electrical and Computer Engineering Cornell University IthacaNY United States Department of Physics The University of Texas Austin AustinTX United States Oden Institute for Computational Engineering and Sciences The University of Texas Austin AustinTX United States Department of Materials Science and Engineering Cornell University IthacaNY United States Foundry Technology Research Intel Corporation HillsboroOR United States National High Magnetic Field Laboratory Los Alamos National Laboratory Los AlamosNM United States Kavli Institute at Cornell for Nanoscale Science IthacaNY United States

GaN has emerged to be a major semiconductor akin to silicon due to its revolutionary impacts in solid state lighting, critically enabled by p-type doping1, and high-performance radio-frequency and power electronics2–4. Suffering from inefficient hole doping and low hole mobility5, quantum oscillations in p-type GaN have not been observed, hindering fundamental studies of valence bands and hole transport in GaN. Here, we present the first observation of quantum oscillations of holes in GaN. Shubnikov-de Haas (SdH) oscillations in hole resistivity are observed in a quantum-confined two-dimensional hole gas at a GaN/AlN interface, where polarization-induced doping overcomes thermal freeze-out, and a sharp and clean interface boosts the hole mobility enough to unmask the quantum oscillations. These holes degenerately occupy the light and heavy hole bands of GaN and have record-high mobilities of ~1900 cm2/Vs and ~400 cm2/Vs at 3K, respectively. We use magnetic fields up to 72 T to resolve SdH oscillations of holes from both valence bands to extract their respective sheet densities, quantum scattering times, and the effective masses of light holes (0.5-0.7 m0) and heavy holes (1.9 m0). SdH oscillations of heavy and light holes in GaN constitute a direct metrology of valence bands and open new venues for quantum engineering in this technologically important semiconductor. Like strained silicon transistors, strain-engineering of the valence bands of GaN is predicted6,7 to dramatically improve hole mobilities by reducing the hole effective mass, a proposal that can now be explored experimentally, particularly in a fully fabricated transistor, using quantum oscillations. Furthermore, the findings of this work suggest a blueprint to create 2D hole gases and observe quantum oscillations of holes in related wide bandgap semiconductors such as SiC and ZnO in which such techniques are not yet possible. Copyright © 2025, The Authors. All rights reserved.

关键词： Gallium nitride

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