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Data layout transformation for structure vectorization on SIMD architectures

Data layout transformation for structure vectorization on SI...

ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Peng-yuan Li Qing-hua Zhang Rong-cai Zhao Hai-ning Yu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

Structure references are commonly-used at the core of applications in a multitude of domains such as image processing, signal processing, especially the scientific and engineering applications. SIMD instruction sets, as SSE, AVX, AltiVec and 3DNow, provide a promising and widely available avenue for enhancing performance on modern processors. However existing memory accessing shackles limit the achieved performance for structure reference on modern SIMD architectures. In this paper, we propose a novel data layout transformation technology that addresses the accessing obstacles, along with a static analysis technique for detecting the legal loops in where this transformation is suitable. And this approach is implemented in the Optimizing Compiler Open64. The experimental results show that the proposed method can translate application with structure access into vectorizable codes, thereby advancing the execution efficiency adequately.

关键词： Decision support systems Arrays Layout Switches Indexes Transforms Benchmark testing

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Improving Steganalysis by Fusing SVM Classifiers for JPEG Images

Improving Steganalysis by Fusing SVM Classifiers for JPEG Im...

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International Conference on Computer Science and Mechanical Automation (CSMA)

作者： Peiqing Liu Fenlin Liu Chunfang Yang Xiaofeng Song State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781467391672

As the present fusing strategies cannot utilize the correlation of different detection results for image steganography effectively, a steganalysis method is proposed based on fusing SVM classifiers. Firstly, different feature subsets are used for the training of SVM classifiers. Secondly, the detection results of multi-classifiers are utilized to train a fusing classifier, the fusing classifier can learn the correlation and diversity of detection results of sub-classifiers. From the experimental result, it can be seen that the proposed steganalysis method can achieve better detection performance for J-UNIWARD steganography compared with voting and Bayesian methods.

关键词： Feature extraction Discrete cosine transforms Support vector machines Training Correlation Transform coding Bayes methods

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An Automatic Reassembly Model and Algorithm of Log File Fragments Based on Graph Theory

An Automatic Reassembly Model and Algorithm of Log File Frag...

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2015 6th IEEE International Conference on Software engineering and Service Science(ICSESS 2015)

作者： Shuai Yi Xueli Hu Hao Wu Information Engineering University State Key Laboratory of Mathematical Engineering and Advanced Computing

Automatic reassembly of log file fragments from a collection of mixed fragments is one of the most important process during log file carving. In this paper we propose a general process model and design an algorithm based on graph theory for automatic reassembly of log file fragments. Finally, an experiment is designed and explored and results demonstrated the validity of the proposed model and algorithm.

关键词： file carve log file reassembly file recovery graph theory

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Web Service QoS Prediction with Adaptive Calibration

Web Service QoS Prediction with Adaptive Calibration

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International Conference on Computer Sciences and Applications (CSA)

作者： Guo-Sheng Li Na Wang State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781479999620

Web services QoS (Quality of Service) prediction in dynamic environment is a critical method to support service selection and service composition. The existing QoS prediction methods focus on the user-side QoS but not the server-side. However, the prediction accuracy of QoS prediction methods for user-side QoS are restricted by the subjectivity of user's feedback, while the server-side QoS prediction methods could get higher prediction accuracy with relying on objective QoS measured value. To this end, we purposed a server-side QoS prediction method for Web service dubbed QoSPAC. Based on Kalman Filter, QoSPAC generates the QoS predicted value and uses the QoS measured value to calibrate it. Furthermore, QoSPAC measures the prediction accuracy, which is also used to calibrate and optimize the prediction period. Experimental results demonstrate that QoSPAC can adapt to the noteworthy measurement error, and can significantly improve the prediction accuracy compared with the conventional technology.

关键词： Quality of service Web services Noise measurement Covariance matrices Time measurement Calibration Q measurement

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SIMD vectorization of nested loop based on strip mining

SIMD vectorization of nested loop based on strip mining

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ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed computing (SNPD)

作者： Jinlong Xu Huihui Sun Rongcai Zhao State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

The difference between vector machine and SIMD extension is analyzed at the very start. The multilevel loop vector code generation algorithm termed Codegen put forward by Kennedy and other fellows can't be directly applied to SIMD extension as it is oriented to vector machine. The vectorization algorithm in state-of-the-art compilers can only process one level of nested loop. In order to vectorize the entire nested loop, a vectorization algorithm based on strip mining called simdcodegen is proposed. Firstly, the formation reason of dependence circles is analyzed and the role of strip mining played in elimination of dependence circles is discussed. Then on the basis of codegen, strip mining is applied on each level of the loop recursively to explore the SIMD parallelism in the nested loop. Although strip mining is always legitimate, the executing cost increases after strip mining. To assure that strip mining is beneficial, that is to say, strip mining can break some dependence circles, cycle broken test is applied before implementation of strip mining. Effectiveness of this method is verified by the experimental results.

关键词： Strips Support vector machines Parallel processing Data mining Fellows Registers Data processing

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Executable Program Code Segment Address Randomization

Executable Program Code Segment Address Randomization

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International Conference on Computer Sciences and Applications (CSA)

作者： Jian Lin Yu-Dong Guo Yu-Jia Man Shao-Huang Zhou State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781479999620

In Linux Address Space layout Randomization, not all memory addresses are random. Executable Program is still loaded to a static address, so an attacker can do code reuse attack by using gadgets in executable program code segment. To improve the weaken ASLR, this paper proposes and implements a new protection method named EPCSAR (Executable Program Code Segment Address Randomization). Taking advantage of static analysis results of IDA, EPCSAR used an IDA plugin to identify the instructions needing relocation in the ELF executable program. By modifying the ELF loader, EPCSAR mapped the executable program code segment into a random address. Evaluation shows the EPCSAR can defense the code reuse attack using gadgets in static region, and only has low runtime overhead of 1.31%.

关键词： Ground penetrating radar Geophysical measurement techniques Linux Libraries Registers Layout Data mining

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Research on Technology of Process Hiding Based on VMM

Research on Technology of Process Hiding Based on VMM

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International Conference on Computer Sciences and Applications (CSA)

作者： Wei-Liang Kong Guang-Yu Zeng Deng-Yuan Zhou State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China

ISBN: (纸本)9781479999620

Kernel-level Rootkit injects malicious code in the system kernel and realizes vicious function by modifying kernel code and data. The emergence of virtualization technology makes Rootkit hide itself and accesses system resources effectively. This paper proposes a kind of Rootkit based on VMM (VMRootkit) which can hide system process and system cannot find it. For realizing it, we firstly puts forward formal model of VMRootkit about cooperative concealment combined with Trojans thought about cooperative concealment, then researches the process switch and data structure of operating system and realized prototype of it, which can monitor system process and realize process depth hiding by modifying data structure related process view. Experiment shows that VMRootkit prototype meets the idea of cooperative concealment, can realize process depth hiding and has better hidden property than kernel-level Rootkit.

关键词： Kernel Monitoring Switches Data structures Prototypes Linux Instruction sets

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Input optics systems of the KAGRA detector during O3GK

arXiv

引用

arXiv 2022年

作者： Akutsu, T. Ando, M. Arai, K. Arai, Y. Araki, S. Araya, A. Aritomi, N. Asada, H. Aso, Y. Bae, S. Bae, Y. Baiotti, L. Bajpai, R. Barton, M.A. Cannon, K. Cao, Z. Capocasa, E. Chan, M. Chen, C. Chen, K. Chen, Y. Chiang, C.-I. Chu, H. Chu, Y.-K. Eguchi, S. Enomoto, Y. Flaminio, R. Fujii, Y. Fujikawa, Y. Fukunaga, M. Fukushima, M. Furuhata, T. Gao, D. Ge, G.-G. Ha, S. Hagiwara, A. Haino, S. Han, W.-B. Hasegawa, K. Hattori, K. Hayakawa, H. Hayama, K. Himemoto, Y. Hiranuma, Y. Hirata, N. Hirose, E. Hong, Z. Hsieh, B.-H. Huang, G.-Z. Huang, H.-Y. Huang, P. Huang, Y.-C. Huang, Y.-J. Hui, D.C.Y. Ide, S. Ikenoue, B. Imam, S. Inayoshi, K. Inoue, Y. Ioka, K. Ito, K. Itoh, Y. Izumi, K. Jeon, C. Jin, H.-B. Jung, K. Jung, P. Kaihotsu, K. Kajita, T. Kakizaki, M. Kamiizumi, M. Kanbara, S. Kanda, N. Kang, G. Kataoka, Y. Kawaguchi, K. Kawai, N. Kawasaki, T. Kim, C. Kim, J. Kim, J.C. Kim, W.S. Kim, Y.-M. Kimura, N. Kita, N. Kitazawa, H. Kojima, Y. Kokeyama, K. Komori, K. Kong, A.K.H. Kotake, K. Kozakai, C. Kozu, R. Kumar, R. Kume, J. Kuo, C. Kuo, H.-S. Kuromiya, Y. Kuroyanagi, S. Kusayanagi, K. Kwak, K. Lee, H.K. Lee, H.W. Lee, R. Leonardi, M. Li, K.L. Lin, L.C.-C. Lin, C.-Y. Lin, F.-K. Lin, F.-L. Lin, H.L. Liu, G.C. Luo, L.-W. Majorana, E. Marchio, M. Michimura, Y. Mio, N. Miyakawa, O. Miyamoto, A. Miyazaki, Y. Miyo, K. Miyoki, S. Mori, Y. Morisaki, S. Moriwaki, Y. Nagano, K. Nagano, S. Nakamura, K. Nakano, H. Nakano, M. Nakashima, R. Nakayama, Y. Narikawa, T. Naticchioni, L. Negishi, R. Nguyen Quynh, L. Ni, W.-T. Nishizawa, A. Nozaki, S. Obuchi, Y. Ogaki, W. Oh, J.J. Oh, K. Oh, S.H. Ohashi, M. Ohishi, N. Ohkawa, M. Ohta, H. Okutani, Y. Okutomi, K. Oohara, K. Ooi, C. Oshino, S. Otabe, S. Pan, K.-C. Pang, H. Parisi, A. Park, J. Pena Arellano, F.E. Pinto, I. Sago, N. Saito, S. Saito, Y. Sakai, K. Sakai, Y. Sakuno, Y. Sato, S. Sato, T. 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 Research Center for the Early Universe The University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo113-0033 Japan Institute for Cosmic Ray Research KAGRA Observatory The University of Tokyo 5-1-5 Kashiwa-no-Ha Kashiwa City Chiba277-8582 Japan 1-1 Oho Tsukuba City Ibaraki305-0801 Japan Earthquake Research Institute The University of Tokyo 1-1-1 Yayoi Bunkyo-ku Tokyo113-0032 Japan Department of Mathematics and Physics Graduate School of Science and Technology Hirosaki University 3 Bunkyo-cho Aomori Hirosaki036-8561 Japan Kamioka Branch National Astronomical Observatory of Japan 238 Higashi-Mozumi Kamioka-cho Gifu Hida City506-1205 Japan 2-21-1 Osawa Mitaka City Tokyo181-8588 Japan Korea Institute of Science and Technology Information 245 Daehak-ro Yuseong-gu Daejeon34141 Korea Republic of National Institute for Mathematical Sciences 70 Yuseong-daero 1689 Beon-gil Yuseong-gu Daejeon34047 Korea Republic of International College Osaka University 1-1 Machikaneyama-cho Toyonaka City Osaka560-0043 Japan 1-1 Oho Tsukuba City Ibaraki305-0801 Japan Department of Astronomy Beijing Normal University Xinjiekouwai Street 19 Haidian District Beijing100875 China Department of Applied Physics Fukuoka University 8-19-1 Nanakuma Jonan Fukuoka Fukuoka City814-0180 Japan Department of Physics Tamkang University No. 151 Yingzhuan Rd. Danshui Dist. New Taipei City25137 Taiwan Department of Physics Institute of Astronomy National Tsing Hua University No. 101 Section 2 Kuang-Fu Road Hsinchu30013 Taiwan Department of Physics Center for High Energy and High Field Physics National Central University No.300 Zhongda

KAGRA, the underground and cryogenic gravitational-wave detector, was operated for its solo observation from February 25th to March 10th, 2020, and its first joint observation with the GEO 600 detector from April 7th - 21st, 2020 (O3GK). This study presents an overview of the input optics systems of the KAGRA detector, which consist of various optical systems, such as a laser source, its intensity and frequency stabilization systems, modulators, a Faraday isolator, mode-matching telescopes, and a high-power beam dump. These optics were successfully delivered to the KAGRA interferometer and operated stably during the observations. The laser frequency noise was observed to limit the detector sensitivity above a few kHz, whereas the laser intensity did not significantly limit the detector sensitivity. © 2022, CC BY.

关键词： Gravity waves

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All-sky search for long-duration gravitational-wave bursts in the third advanced LIGO and advanced Virgo run

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Physical Review D 2021年第10期104卷 102001-102001页

作者： R. Abbott T. D. Abbott F. Acernese K. Ackley C. Adams N. Adhikari R. X. Adhikari V. B. Adya C. Affeldt D. Agarwal M. Agathos K. Agatsuma N. Aggarwal O. D. Aguiar L. Aiello A. Ain P. Ajith T. Akutsu S. Albanesi A. Allocca P. A. Altin A. Amato C. Anand S. Anand A. Ananyeva S. B. Anderson W. G. Anderson M. Ando T. Andrade N. Andres T. Andrić S. V. Angelova S. Ansoldi J. M. Antelis S. Antier S. Appert Koji Arai Koya Arai Y. Arai S. Araki A. Araya M. C. Araya J. S. Areeda M. Arène N. Aritomi N. Arnaud S. M. Aronson K. G. Arun H. Asada Y. Asali G. Ashton Y. Aso M. Assiduo S. M. Aston P. Astone F. Aubin C. Austin S. Babak F. Badaracco M. K. M. Bader C. Badger S. Bae Y. Bae A. M. Baer S. Bagnasco Y. Bai L. Baiotti J. Baird R. Bajpai M. Ball G. Ballardin S. W. Ballmer A. Balsamo G. Baltus S. Banagiri D. Bankar J. C. Barayoga C. Barbieri B. C. Barish D. Barker P. Barneo F. Barone B. Barr L. Barsotti M. Barsuglia D. Barta J. Bartlett M. A. Barton I. Bartos R. Bassiri A. Basti M. Bawaj J. C. Bayley A. C. Baylor M. Bazzan B. Bécsy V. M. Bedakihale M. Bejger I. Belahcene V. Benedetto D. Beniwal T. F. Bennett J. D. Bentley M. BenYaala F. Bergamin B. K. Berger S. Bernuzzi D. Bersanetti A. Bertolini J. Betzwieser D. Beveridge R. Bhandare U. Bhardwaj D. Bhattacharjee S. Bhaumik I. A. Bilenko G. Billingsley S. Bini R. Birney O. Birnholtz S. Biscans M. Bischi S. Biscoveanu A. Bisht B. Biswas M. Bitossi M.-A. Bizouard J. K. Blackburn C. D. Blair D. G. Blair R. M. Blair F. Bobba N. Bode M. Boer G. Bogaert M. Boldrini L. D. Bonavena F. Bondu E. Bonilla R. Bonnand P. Booker B. A. Boom R. Bork V. Boschi N. Bose S. Bose V. Bossilkov V. Boudart Y. Bouffanais A. Bozzi C. Bradaschia P. R. Brady A. Bramley A. Branch M. Branchesi J. E. Brau M. Breschi T. Briant J. H. Briggs A. Brillet M. Brinkmann P. Brockill A. F. Brooks J. Brooks D. D. Brown S. Brunett G. Bruno R. Bruntz J. Bryant T. Bulik H. J. Bulten A. Buonanno R. Buscicchio D. Buskulic C. Buy R. L. Byer L. Cadonati G. Cagnoli C. Cahillane J. Calderón Bustillo J. D. Callaghan T. A. Callis LIGO Laboratory California Institute of Technology Pasadena California 91125 USA Louisiana State University Baton Rouge Louisiana 70803 USA Dipartimento di Farmacia Università di Salerno I-84084 Fisciano Salerno Italy INFN Sezione di Napoli Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy OzGrav School of Physics and Astronomy Monash University Clayton 3800 Victoria Australia LIGO Livingston Observatory Livingston Louisiana 70754 USA University of Wisconsin-Milwaukee Milwaukee Wisconsin 53201 USA OzGrav Australian National University Canberra Australian Capital Territory 0200 Australia Max Planck Institute for Gravitational Physics (Albert Einstein Institute) D-30167 Hannover Germany Leibniz Universität Hannover D-30167 Hannover Germany Inter-University Centre for Astronomy and Astrophysics Pune 411007 India University of Cambridge Cambridge CB2 1TN United Kingdom Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena D-07743 Jena Germany University of Birmingham Birmingham B15 2TT United Kingdom Center for Interdisciplinary Exploration & Research in Astrophysics (CIERA) Northwestern University Evanston Illinois 60208 USA Instituto Nacional de Pesquisas Espaciais 12227-010 São José dos Campos São Paulo Brazil Gravity Exploration Institute Cardiff University Cardiff CF24 3AA United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan (NAOJ) Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino I-10125 Torino Italy Università di Napoli “Federico II ” Complesso Universitario di Monte S. Angelo I-80126 Napoli Italy Université de Lyon Université Claude Bernard Lyon 1 CNRS Institut Lumière Matière F-69622 Villeurbanne France

After the detection of gravitational waves from compact binary coalescences, the search for transient gravitational-wave signals with less well-defined waveforms for which matched filtering is not well suited is one of the frontiers for gravitational-wave astronomy. Broadly classified into “short” ≲1 s and “long” ≳1 s duration signals, these signals are expected from a variety of astrophysical processes, including non-axisymmetric deformations in magnetars or eccentric binary black hole coalescences. In this work, we present a search for long-duration gravitational-wave transients from advanced LIGO and advanced Virgo’s third observing run from April 2019 to March 2020. For this search, we use minimal assumptions for the sky location, event time, waveform morphology, and duration of the source. The search covers the range of 2–500 s in duration and a frequency band of 24–2048 Hz. We find no significant triggers within this parameter space; we report sensitivity limits on the signal strength of gravitational waves characterized by the root-sum-square amplitude hrss as a function of waveform morphology. These hrss limits improve upon the results from the second observing run by an average factor of 1.8.

关键词： Astrophysical studies of gravity Gravitational wave detection Gravitational wave sources Gravitational waves

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Nuclear structure of Ni76 from the (p,2p) reaction

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Physical Review C 2019年第1期99卷 014312-014312页

作者： Z. Elekes Á. Kripkó D. Sohler K. Sieja K. Ogata K. Yoshida P. Doornenbal A. Obertelli G. Authelet H. Baba D. Calvet F. Château A. Corsi A. Delbart J.-M. Gheller A. Gillibert T. Isobe V. Lapoux M. Matsushita S. Momiyama T. Motobayashi H. Otsu C. Péron A. Peyaud E. C. Pollacco J.-Y. Roussé H. Sakurai C. Santamaria Y. Shiga S. Takeuchi R. Taniuchi T. Uesaka H. Wang K. Yoneda F. Browne L. X. Chung Zs. Dombrádi F. Flavigny S. Franchoo F. Giacoppo A. Gottardo K. Hadyńska-Klęk Z. Korkulu S. Koyama Y. Kubota J. Lee M. Lettmann C. Louchart R. Lozeva K. Matsui T. Miyazaki M. Niikura S. Nishimura L. Olivier S. Ota Z. Patel E. Sahin C. Shand P.-A. Söderström I. Stefan D. Steppenbeck T. Sumikama D. Suzuki Zs. Vajta V. Werner J. Wu Z. Xu MTA Atomki P.O. Box 51 H-4001 Debrecen Hungary CNRS UMR 7178 F-67037 Strasbourg France Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki 567-0047 Japan Department of Physics Osaka City University Osaka 558-8585 Japan Advanced Science Research Center Japan Atomic Energy Agency Tokai Ibaraki 319-1195 Japan RIKEN Nishina Center 2-1 Hirosawa Wako Saitama 351-0198 Japan Institut für Kernphysik Technische Universität Darmstadt 64289 Darmstadt Germany IRFU CEA Université Paris-Saclay F-91191 Gif-sur-Yvette France Center for Nuclear Study University of Tokyo RIKEN Campus Wako Saitama 351-0198 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-0033 Japan Department of Physics Rikkyo University 3-34-1 Nishi-Ikebukuro Toshima Tokyo 172-8501 Japan School of Computing Engineering and Mathematics University of Brighton Brighton BN2 4GJ United Kingdom Institute for Nuclear Science & Technology VINATOM P.O. Box 5T-160 Nghia Do Hanoi Vietnam Institut de Physique Nucléaire IN2P3-CNRS Université Paris-Sud Université Paris-Saclay 91406 Orsay Cedex France Department of Physics University of Oslo N-0316 Oslo Norway Department of Physics The University of Hong Kong Pokfulam Hong Kong Université de Strasbourg IPHC 23 rue du Loess F-67037 Strasbourg France CSNSM CNRS/IN2P3 Université Paris-Saclay F-91405 Orsay Campus France Department of Physics University of Surrey Guildford GU2 7XH United Kingdom Department of Physics Tohoku University Sendai 980-8578 Japan State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 People's Republic of China

The nuclear structure of the Ni76 nucleus was investigated by (p,2p) reaction using a NaI(Tl) array to detect the deexciting prompt γ rays. A new transition with an energy of 2227 keV was identified by γγ and γγγ coincidences. According to these coincidence spectra the observed transition connects a new state at 4147 keV and the previously known 41+ state at 1920 keV. Two weaker transitions were also obtained at 2441 and 2838 keV, which could be tentatively placed to feed the known 21+ state at 990 keV. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z=28 shell gap for nickel isotopes in accordance with previous studies.

关键词： Electromagnetic transitions Energy levels & level densities Nuclear spin & parity Nuclear structure & decays Shell model Spectroscopic factors & electromagnetic moments 59 ≤ A ≤ 89

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