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Accelerating the LOBPCG method on sunway taihulight 21

Accelerating the LOBPCG method on sunway taihulight

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21st IEEE International conference on high performance Computing and Communications, 17th IEEE International conference on Smart City and 5th IEEE International conference on Data Science and Systems, HPCC/SmartCity/DSS 2019

作者： Yu, Tianyu Zhao, Yonghua Zhao, Lian Computer Network Information Center Chinese Academy of Sciences University of Chinese Academy of Sciences Beijing China Computer Network Information Center Chinese Academy of Sciences Beijing China

ISBN: (纸本)9781728120584

LOBPCG is a numerical eigensolver which can be parallelly implemented. In this paper, methods of optimization suitable for Sunway TaihuLight are discussed cover the main computations of LOBPCG. Two-level parallel architecture is proposed and followed by the introduction of a communication-avoiding parallel algorithm of sparse matrix-vector product. The algorithm not only overlaps computation and MPI communication but also overlaps data transfer between main memory and the scratch memory on the core group. A data buffering strategy with automatic adjustment during the runtime is proposed. Then, a new implementation of dense matrix multiplication adapted to the Sunway architecture is proposed. The scalability results demonstrate our routines led to significant promotions. We also analyze the performance on the Hamilton matrix from the Density Matrix Renormalization Group (DMRG) method, which is widely used by the computational physicist. © 2019 IEEE.

关键词： Data transfer

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RF performance of 130 nm Al0.75Ga0.25N/Al0.6Ga0.4N HFETs with MBE-Regrown Contacts

RF Performance of 130 nm Al0.75Ga0.25N/Al0.6Ga0.4N HFETs wit...

引用

2019 Device Research conference, DRC 2019

作者： Xue, Hao Lee, Choong Hee Hussian, Kamal Razzak, Towhidur Abdullah, Mamun Xia, Zhanbo Sohel, Shahadat Hasan Khan, Asif Rajan, Siddharth Lu, Wu Ohio State University Department of Electrical and Computer Engineering ColumbusOH43210 United States College of Engineering and Computing University of South Carolina 301 Main Street ColumbiaSC29208 United States

ISBN: (纸本)9781728121123

AlGaN channel transistors are promising candidates for high power RF transistors due to their superior material properties. The larger breakdown field and similar saturation velocity compared to GaN make AlGaN channel transistors potentially capable of delivering higher power density at high frequencies. So far the highest reported \mathrm{f}-{\mathrm{T}} is 28 GHz on Al0.85Ga0.15N/Al0.70Ga0.30N transistors with RF power density of 0.3 W/mm at 3 GHz [1]. The major obstacle to achieve high RF performance is the challenge to form good ohmic contacts to Al-rich AlGaN. Here, we show significantly better small and large signal RF performance than what have been reported on high Al-composition AlGaN transistors with regrown side contacts. © 2019 IEEE.

关键词： Ohmic contacts

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The implementation and evaluation of high-speed link monitoring tool for supercomputer 1

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22nd Annual conference on computer Engineering and Technology, NCCET 2018

作者： Xu, Jiaqing He, Jie Hu, Xiaotao Cao, Jijun Zhang, Lei Wang, Chongfeng School of Computer National University of Defense Technology Changsha China

ISBN: (数字)9789811359194

ISBN: (纸本)9789811359187

With the increase of system scale and link speed, the link failure has become the most important type of interconnect fault in supercomputers, which has brought great challenges to the maintenance of high-performance interconnect networks. In order to meet the needs of operation and maintenance personnel to monitor the status and performance of all high-speed links of supercomputer in real-time, this paper designs a high-speed link monitoring tool based on in-band network, which has good scalability and robustness for real-time monitoring of high-speed link status and performance information. The tool has been practically utilized in the operation and maintenance of domestic supercomputers to speed up the process of locating and troubleshooting link failures, effectively reducing the downtime of supercomputers. © 2019, Springer Nature Singapore Pte Ltd.

关键词： Supercomputers

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BC-store: A scalable design for blockchain storage 20

BC-store: A scalable design for blockchain storage

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2nd International Electronics Communication conference, IECC 2020 and the 2nd Blockchain and Internet of Things conference, BIOTC 2020

作者： Chou, I-Te Su, Hung-Han Hsueh, Yu-Ling Hsueh, Chih-Wen National Chung Cheng University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taiwan

ISBN: (纸本)9781450377706

The blockchain technology has obtained significant success in the past decades. However, a serious underlying problem still exists in the blockchain system - data bloating. In the blockchain system, each (full) node must store the full data set in blockchain history, incurring significant storage pressure in the initial synchronization process and the following maintenance of the blockchain system. Data bloating is a challenging problem to be confronted in the immediate future of blockchain. To address this problem, in this paper, we introduce the BC-Store framework that deploys a data accessing model on an IPFS-cluster system to classify the hot and cold blockchain data. The hot data are stored in the local cache, whereas the cold data are stored in the IPFS cluster, thereby substantially shortening the blockchain initial synchronization time and saving a considerable amount of data storage. Empirical experimentation shows that our framework can reduce the local storage size from over 265GB to 4GB with a hit ratio of 77% for Bitcoin without significant performance degradation with the whole data shared in an IPFS cluster. © 2020 ACM.

关键词： Blockchain

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Vertex-disjoint paths in the generalized hypercube under 1-restricted connectivity 21

Vertex-disjoint paths in the generalized hypercube under 1-r...

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作者： Wang, Guijuan Lin, Cheng-Kuan Fan, Jianxi Cheng, Baolei Liu, Zhao School of Computer Science and Technology Soochow University Suzhou215006 China College of Mathematics and Computer Science Fuzhou University Fuzhou350108 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Jiangsu Province Nanjing210003 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou215006 China

ISBN: (纸本)9781728120584

The generalized hypercube is an excellent interconnection network since it includes many interconnection topologies and it can be used to construct many data center networks. Considering the probability that, in general, all neighbors of one vertex becoming faulty at the same time is extremely low, we assume that each vertex has at least one fault-free neighbor. An r-dimensional generalized hypercube is denoted by G(m-r, m-r-1,⋅, m-1). In this paper, we proposed an efficient algorithm which can construct at least κ^1(G) disjoint paths based on any two adjacent vertices in G(m-r, m-r-1, m-1) in O(rm) time where κ^1(G) is the 1-restricted connectivity of G(m-r, m-r-1, m-1). The maximum length of these disjoint paths is bounded by 7. © 2019 IEEE.

关键词： Fault tolerance

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program Model of the Interacting Adaptive Traffic Control System 10th

Program Model of the Interacting Adaptive Traffic Control Sy...

引用

10th International conference on high-performance Computing Systems and Technologies in Scientific Research, Automation of Control and Production, HPCST 2020

作者： Radionov, Timofei Mikhalev, Anton Kukartsev, Vladislav Tynchenko, Vadim Siberian Federal University Svobodnyy Ave 82A Krasnoyarsk660041 Russia Reshetnev Siberian State University of Science and Technology Gazety Krasnoyarsky Rabochy Ave. 31 Krasnoyarsk660014 Russia Marine Hydrophysical Institute of Russian Academy of Sciences Kapitanskaya Street 2 Sevastopol299011 Russia

ISBN: (纸本)9783030668945

The article is devoted to the issue of traffic management. A review of existing software solutions for simulating traffic situations has been carried out, and several approaches to optimizing the operation of traffic lights have been described. The algorithms and features of the functioning of modern automated traffic control systems are described. A developed software model, its interface, functionality, and a device for studying various algorithms for traffic lights regulation at two intersections with four-way intersection are considered. A traffic light signal regulation algorithm developed by the authors is presented, which is a modification of the existing adaptive regulation algorithm. The article presents the traffic light regulation algorithm developed by the authors, which is a modification of the existing adaptive regulation algorithm. The structure and operation of this algorithm are described mathematically. The analysis and comparison of the presented algorithm with the existing control algorithms in terms of efficiency and time are carried out. Based on the results obtained, conclusions were made about the possibility of introducing the author’s algorithm considered in the article into a real process. © 2020, Springer Nature Switzerland AG.

关键词： Traffic congestion

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Improving 3D Medical Image Compression Efficiency Using Spatiotemporal Coherence 18

Improving 3D Medical Image Compression Efficiency Using Spat...

引用

18th Image Processing: Algorithms and Systems conference, IPAS 2020

作者： Zerva, Matina Ch. Vrigkas, Michalis Kondi, Lisimachos P. Nikou, Christophoros Department of Computer Science and Engineering University of Ioannina Ioannina Greece

Advanced methodologies for transmitting compressed images, within acceptable ranges of transmission rate and loss of information, make it possible to transmit a medical image through a communication channel. Most prior works on 3D medical image compression consider volumetric images as a whole but fail to account for the spatial and temporal coherence of adjacent slices. In this paper, we set out to develop a 3D medical image compression method that extends the 3D wavelet difference reduction algorithm by computing the similarity of the pixels in adjacent slices and progressively compress only the similar slices. The proposed method achieves high-efficiency performance on publicly available datasets of MRI scans by achieving compression down to one bit per voxel with PSNR and SSIM up to 52.3 dB and 0.7578, respectively. © 2020, Society for Imaging Science and Technology

关键词： Efficiency

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FOXNET: A MULTI-FACE ALIGNMENT METHOD 26

FOXNET: A MULTI-FACE ALIGNMENT METHOD

引用

26th IEEE International conference on Image Processing (ICIP)

作者： Wu, Yuxiang Cheng, Zehua Huang, Bin Chen, Yiming Zhu, Xinghui Wang, Weiyang Hunan Agr Univ AISA Res Changsha Hunan Peoples R China SnowCloud Ai Beijing Peoples R China

ISBN: (纸本)9781538662496

Multi-face alignment aims to identify geometry structures of multiple faces in an image, and its performance is essential for the many practical tasks, such as face recognition, face tracking, and face animation. In this work, we present a fast bottom-up multi-face alignment approach, which can simultaneously localize multi-person facial landmarks with high precision. In more detail, our bottom-up architecture maps the landmarks to the high-dimensional space with which landmarks of all faces are represented. By clustering the features belonging to the same face, our approach can align the multi-person facial landmarks synchronously. Extensive experiments show that our method can achieve high performance in the multi-face landmark alignment task while our model is extremely fast. Moreover, we propose a new multi-face dataset to compare the speed and precision of bottom-up face alignment method withtop-down methods. Our dataset is publicly available at(1).

关键词： Face Alignment computer Vision Deep Learning Cluster

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Status of KAGRA 38

Status of KAGRA

引用

38th International Cosmic Ray conference, ICRC 2023

作者： Itoh, Yousuke Abe, H. Akutsu, T. Ando, M. Aoumi, M. Araya, A. Aritomi, N. Aso, Y. Bae, S. Bajpai, R. Cannon, K. Cao, Z. Chang, R.-J. Chen, A.H.-Y. Chen, D. Chen, H. Chen, Y. Chiba, A. Chiba, R. Chou, C. Eisenmann, M. Fujii, S. Fukunaga, I. Haba, D. Haino, S. Han, W.-B. Hayakawa, H. Hayama, K. Himemoto, Y. Hirata, N. Hirose, C. Hoshino, S. Hsieh, H.-F. Hsiung, C. Hsu, S.-C. Hui, D.C.Y. Inayoshi, K. Itoh, Y. Iwaya, M. Jin, H.B. Jung, K. Kajita, T. Kamiizumi, M. Kanda, N. Kato, J. Kato, T. Kim, S. Kimura, N. Kiyota, T. Kohri, K. Kokeyama, K. Komori, K. Kong, A.K.H. Koyama, N. Kume, J. Kuroyanagi, S. Kuwahara, S. Kwak, K. Lai, S. Lee, H.W. Lee, R. Lee, S. Leonardi, M. Li, K.L. Lin, L.C.-C. Lin, C.-Y. Lin, E.T. Liu, G.C. Ma, L.-T. Maeda, K. Matsuyama, M. Meyer-Conde, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, S. Miyoki, S. Morisaki, S. Moriwaki, Y. Murakoshi, M. Nakamura, K. Nakano, H. Narikawa, T. Nguyen Quynh, L. Nishino, Y. Nishizawa, A. Obayashi, K. Oh, J.J. Oh, K. Ohashi, M. Ohkawa, M. Oohara, K. Oshima, Y. Oshino, S. Page, M.A. Pan, K.-C. Park, J. Peña Arellano, F.E. Saha, S. Sakai, K. Sako, T. Sato, R. Sato, S. Sato, Y. Sawada, T. Sekiguchi, Y. Shao, L. Shikano, Y. Shimode, K. Shinkai, H. Shiota, J. Somiya, K. Suzuki, T. Suzuki, T. Tagoshi, H. Takahashi, H. Takahashi, R. Takamori, A. Takatani, K. Takeda, H. Takeda, M. Tamaki, M. Tanaka, K. Tanaka, S.J. Tanaka, T. Taruya, A. Tomaru, T. Tomita, K. Tomura, T. Toriyama, A. Trani, A.A. Tsuchida, S. Uchikata, N. Uchiyama, T. Uehara, T. Ueno, K. Ushiba, T. van Putten, M.H.P.M. Wang, H. Washimi, T. Wu, C. Wu, H. Yamamoto, K. Yamamoto, M. Yamamoto, T. Yamamoto, T.S. Yamamura, S. Yamazaki, R. Yang, L.-C. Yang, Y. Yeh, S.-W. Yokoyama, J. Yokozawa, T. Yuzurihara, H. Zhao, Y. Zhu, Z.-H. Osaka Metropolitan University Sumiyoshi Osaka3-3-138 Japan Graduate School of Science Tokyo Institute of Technology 2-12-1 Ookayama Meguro-ku Tokyo152-8551 Japan Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Department of Physics The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute for Cosmic Ray Research KAGRA Observatory The University of Tokyo 238 Higashi-Mozumi Kamioka-cho Hida City Gifu506-1205 Japan Earthquake Research Institute The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo113-0032 Japan LIGO Hanford Observatory RichlandWA99352 United States 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan 245 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of Department of Astronomy Beijing Normal University Xinjiekouwai Street 19 Haidian District Beijing100875 China Department of Physics National Cheng Kung University No.1 University Road Tainan City701 Taiwan Institute of Physics National Yang Ming Chiao Tung University 101 Univ. Street Hsinchu Taiwan Kamioka Branch National Astronomical Observatory of Japan 238 Higashi-Mozumi Kamioka-cho Hida City Gifu506-1205 Japan Department of Physics National Tsing Hua University No. 101 Section 2 Kuang-Fu Road Hsinchu30013 Taiwan Faculty of Science University of Toyama 3190 Gofuku Toyama City Toyama930-8555 Japan Institute for Cosmic Ray Research KAGRA Observatory The University of Tokyo 5-1-5 Kashiwa-no-Ha Chiba Kashiwa City277-8582 Japan Department of Electrophysics National Yang Ming Chiao Tung University 101 Univ. Street Hsinchu Taiwan Department of Physics Graduate School of Science Osaka Metropolitan University 3-3-138 Sugimoto-cho Sumiyoshi-ku Osaka City Osaka558-8585 Japan Inst

The gravitational wave detectors LIGO and Virgo have so far detected gravitational wave signals from 90 compact binary coalescences including two from neutron star binary mergers. Those detections are revolutionizing our understanding of the universe. This ongoing revolution will be accelerated by more accurate localizations of the gravitational wave sources and by longer coincident observation by multi-detectors, which will be made possible using as many detectors as possible. KAGRA is a gravitational wave detector built at Kamioka in Gifu prefecture, Japan, well away from the LIGO and Virgo detectors, with unique features of having cryogenic mirrors and being built underground. KAGRA can be a prototype for next-generation gravitational wave detectors and our experiences benefit those detectors that would have those features to achieve further sensitivity to gravitational waves. In this presentation, the status of KAGRA is given. © Copyright owned by the author(s) under the terms of the Creative Commons.

关键词： Gravitational effects

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A fault-tolerant routing strategy with graceful performance degradation for fat-tree topology supercomputer 21

A fault-tolerant routing strategy with graceful performance ...

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作者： Xu, Jiaqing Cai, Dongjing He, Jie Tang, Fuqiao School of Computer National University of Defense Technology Changsha Hunan China

ISBN: (纸本)9781728120584

In recent years, in order to solve the problem of high-speed signal transmission quality, the solution of short reach HSS + on-board optics + passive optical fiber is gradually replacing the original long reach HSS + AOC inter-switch interconnection scheme. When the on-board optics fails, its replacement time will be much higher than that of AOC, which increases the duration of interconnection failure in the system. We believe that it is essential that the fault-tolerant routing strategy can reduce the degradation of the performance of the interconnection network without suspending the operation of the tasks, as this will greatly improve the overall availability of the system during the duration of the failure. In this paper, a fault-tolerant routing strategy for fat-tree topology is proposed, which can tolerate multiple interconnect failures with only a graceful performance degradation through actual system testing. © 2019 IEEE.

关键词： Fault tolerance

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