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5th IEEE International Conference on Computational Electromagnetics, ICCEM 2019

作者： Wang, Wu Department of High Performance Computing Technology and Application Development Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781538671115

Fast multipole method (FMM) is a fast, robust and accurate algorithm which is widely used in molecular dynamics, electrostatics and electromagnetics simulations. In this paper, we implemented and optimized parallel FMM for potential field integral equation on Sunway supercomputer with heterogeneous manycore processors. Two main optimization methods are proposed to improve the performance: direct memory access (DMA) and SIMD vectorization. Morton curve line cutting and local essential tree are used for parallel implementation. The speedup and parallel scalability of FMM are presented. © 2019 IEEE.

关键词： Integral equations

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A Real-time Relaxed Garbage Collection in DSM

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电子学报(英文版) 2007年第1期16卷 7-12页

作者： WU Junmin SONG Zhenhua Anhui Province Co-Key Laboratory of High Performance Computing and Application Department of Computer Science ＆ Technology University of Science ＆ Technology of China Hefei 230027 China

Garbage collection is a memory management mechanism for automatically reclaiming garbage objects in memory. It can effectively relieve the programmers' burden and optimize the design of programs. Currently many garbage collection methods for distributed systems have been put forth as the distributed systems are more and more popular. Relaxed consistency model is a very important kind of memory consistency model in distributed system, but it is inefficiently to perform garbage collection in the Distributed shared memory system (DSM) on relaxed memory model with traditional methods. This article proposes a trace-based garbage collection algorithm for DSM system based on relaxed memory model. Our algorithm notes the references among active objects of every node in DSM system, which makes the application process and the collection process able to execute concurrently. And it makes use of the relaxed consistency model's features to reduce communication cost and response delay. Furthermore, the use of two tables insures the algorithm correct and effective. This algorithm displays its advantages of real-time and incremental, and it is proved to be correct and effective.

关键词：垃圾回收算法分布式共享存储系统实时弱一致性模型 DSM

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An overview of the haplotype problems and algorithms

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中国高等学校学术文摘·计算机科学 2007年第3期1卷 272-282页

作者： ZHAO Yuzhong XU Yun ZHANG Qiangfeng CHEN Guoliang Computer Science Department University of Science and Technology of ChinaHefei 230027China Anhui Province-MOST Co-Key Laboratory of High Performance Computing and Its Application Hefei 230027China

A single nucleotide polymorphism (SNP),as the most common form of genetic variation,has been widely studied to help analyze the possible association between diseases and *** gain more information,SNPs on a single chromosome are usually studied together,which constitute a *** haplotypes from biological experiments is usually very costly and time-consuming,which causes people to develop efficient methods to determine haplotypes from the computational *** problems and algorithms about haplotypes have been proposed to reduce the cost of studies of disease *** general,four categories of problems are widely researched:the haplotype assembly problem,the haplotype inference problem,the haplotype block partition problem,and the haplotype tagging SNP selection *** former two problems have been well reviewed by many researchers,whereas the latter two have not been comprehensively surveyed to our *** this paper,we try to make a detailed introduction to the four problems,especially the latter two.

关键词： bioinformatics haplotype single nucleotide polymorphism (SNP) algorithm complexity

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Blood Flow Modeling in Stenosed Arteries Using CFD Solver 9th

Blood Flow Modeling in Stenosed Arteries Using CFD Solver

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9th International and 49th National Conference on Fluid Mechanics and Fluid Power, FMFP 2022

作者： Praharaj, Priyambada Sonawane, Chandrakant Kumar, Vikas Symbiosis Institute of Technology Pune412115 India High Performance Computing-Scientific and Engineering Application Centre for Development of Advanced Computing Pune411008 India

ISBN: (纸本)9789819971763

Simulation of blood flow in arteries is an extensive topic of research to study various hemodynamic factors in CFD. This paper studies two different degrees of stenosis (less than 50 and 80% by flow area) that have been extracted from real images. The pulsatile nature of the blood flow has been considered. Changes in velocity flow patterns and wall shear stress for the two cases have been studied. Results show that the peak velocity increases drastically as the stenosis area increases to 80%. Negative velocity near the walls of the artery shows flow separation. This value also increases with the increase in stenosis area. This is seen in almost all regions of the cardiac cycle except in the accelerating flow region. With the increase in stenosis area, wall shear stress (WSS) rises drastically. Negative wall shear stress seen downstream of stenosis also indicates recirculation. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Computational fluid dynamics

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Coverage and Exposure Paths in Wireless Sensor Networks

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Journal of Computer Science & technology 2006年第4期21卷 490-495页

作者：黄刘生徐宏力汪炀吴俊敏李虹 Department of Computer Science and Technology University of Science & Technology of China Hefei 230027 P.R. China Anhui Province-Most Co-Key Laboratory of High Performance Computing and Its Application Hefei 230027 P.R. China

Wireless sensor networks have posed a number of challenging problems such as localization, deployment and tracking, etc. One of the interesting problems is the calculation of the coverage and exposure paths for the sensor networks. This paper presents a fully localized algorithm to solve the worst coverage problem first introduced by Meguerdichian et al. The nodes of the sensor network cooperate to construct the worst coverage path only by the one-hop neighbor＇s information, thus avoiding the massive communication and conserving the energy. The correctness of the proposed algorithm is proved formally under the sensing diminishing model. Moreover, this algorithm can be easily extended to solve the minimal exposure problem with local information as well.

关键词： coverage wireless sensor networks localized algorithm exposure

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MPUS: A scalable parallel simulator for RedNeurons parallel computer (work-in-progress) 2

MPUS: A scalable parallel simulator for RedNeurons parallel ...

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2nd International Conference on Scalable Information Systems, InfoScale 2007

作者： Hui, Li Junming, Wu Guoliang, Chen Xiufeng, Sui Department of Computer Science and Technology Anhui Province Co-Key Laboratory of High Performance Computing and Application University of Science and Technology of China China

ISBN: (纸本)9781595937575

In this paper, we present a scalable parallel simulator - MPUS - for verifying the design of our next generation high performance parallel computer - RedNeurons(RN) parallel computer. The RedNeurons parallel computer is based on CMP technology, and it adopts an advanced but maybe some complicated architecture and topology. This paper mainly describes the design and implementation of the MPUS.

关键词： Simulators

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Using Supercomputer to Speed up Neural Network Training

Using Supercomputer to Speed up Neural Network Training

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International Conference on Parallel and Distributed Systems (ICPADS)

作者： Yue Yu Jinrong Jiang Xuebin Chi Department of High Performance Computing Technology and Application Development University of Chinese Academy of Sciences Beijing China Department of High Performance Computing Technology and Application Development Center of Scientific Computing Applications & Research Beijing China Department of High Performance Computing Technology and Application Development Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781509053827

Recent works in deep learning have shown that large models can dramatically improve performance. In this paper, we accelerated the deep network training using many GPUs. We have developed a framework based on Caffe called Caffe-HPC that can utilize computing clusters with multiple GPUs to train large models. Caffe[6] provides multimedia scientists and practitioners with a clean and modifiable framework for state-of-the-art deep learning algorithms and a collection of reference models. And Caffe-HPC retains all the features of the original Caffe, the model trained on original Caffe can be continue to trained on Caffe-HPC. It provides a convenient solution for people who are using Caffe and want to speed up the training. Using an Asynchronous Stochastic Gradient Descent optimizer, We made a good acceleration on training a CNN model on ILSVRC[5] 2012 dataset. And we have compared the convergence of different SGD algorithms. We believe our work will makes it possible to train larger networks on larger training sets in a reasonable amount of time.

关键词： Servers Training Graphics processing units Neural networks Machine learning Computational modeling Acceleration

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A transmission power control MAC protocol for wireless sensor networks

A transmission power control MAC protocol for wireless senso...

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6th International Conference on Networking, ICN'07

作者： Zhao, Zhiwei Zhang, Xinming Sun, Peng Liu, Pengxi Department of Computer Science and Technology University of Science and Technology of China MOST Co-Key Laboratory of High Performance Computing and Its Application Anhui Province Hefei 230027 China

ISBN: (纸本)0769528058

Wireless sensor networks have been widely used in many important fields. Medium Access Control (MAC) protocols have a significant effect on the function and performance of sensor networks. At present, most MAC protocols use the same transmission power when sensor nodes send packets. However, the deployment of the sensor nodes is asymmetrical in wireless sensor networks, which will bring more energy consumption and unnecessary collisions. By jointing the MAC layer and physical layer of the senor nodes, and based on Sensor MAC (SMAC) [1] protocol, we propose a transmission power control MAC protocol in wireless sensor networks (transmission Power control in SMAC, PSMAC). The simulation results show that, compared with the SMAC protocol, our protocol has improved a lot in the delay of packets, reception rate, energy consumption and throughput of the networks. © 2007 IEEE.

关键词： Wireless sensor networks

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A novel virtual anchor node-based localization algorithm for wireless sensor networks

A novel virtual anchor node-based localization algorithm for...

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6th International Conference on Networking, ICN'07

作者： Liu, Pengxi Zhang, Xinming Tian, Shuang Zhao, Zhiwei Sun, Peng Department of Computer Science and Technology University of Science and Technology of China MOST Co-Key Laboratory of High Performance Computing and Its Application Anhui Province Hefei 230027 China

ISBN: (纸本)0769528058

The accuracy of localization is a significant criterion to evaluate the practical utility of localization algorithm in wireless sensor networks. In mostly localization algorithms, one of the main methods to improve localization accuracy is to increase the number of anchor nodes. But the number of anchor nodes is always limited because of the hardware restrict, such as cost, energy consumption and so on. In this paper, we propose a novel algorithm with small extra logical overhead, which uses the shortest-hop path scheme to upgrade virtual anchor nodes, while the real number of physical anchors is the same as before. This algorithm firstly chooses out some special nodes from all the unknown ones to figure out more accurate positions of them, and then makes these ones as new virtual anchor nodes assist other unknowns in localizing together with the real anchors. The simulation results illustrate our algorithm has improved the accuracy of localization greatly. © 2007 IEEE.

关键词： Wireless sensor networks

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A practical low interference topology control for mobile ad hoc networks

A practical low interference topology control for mobile ad ...

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6th International Conference on Networking, ICN'07

作者： Yu, Xiang Zhang, Xinming Que, Can Liu, Qiong Department of Computer Science and Technology University of Science and Technology of China Anhui Province - MOST Co-Key Laboratory of High Performance Computing and Its Application Hefei 230027 China

ISBN: (纸本)0769528058

The interference imposes a potential negative impact on the performance of a wireless network. A device is interfered if it receives a transmission not intended for it. In this paper, we introduce an explicit computation model of node interference based on its actual inducement on the physical layer. We prove that there exists an optimal algorithm to solve the corresponding topology control problem, constructing a network topology with minimum node interference. We also investigate the bad performance of existing methods of solving it and propose a revised algorithm, namely Low Interference-amount Neighborhood Tree (LINT), based on a new link cost metric. The simulation results illustrate that our model is able to reduce node interference effectively and maintain the network performance. © 2007 IEEE.

关键词： Ad hoc networks

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