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International Conference on advanced Communication Technology (ICACT)

作者： Shichang Ding Xiangyang Luo Meijuan Yin Yan Liu Fenlin Liu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Science and Technology Institute China

ISBN: (纸本)9781467381161

Recent years have seen a rapid growth of location-aware applications such as targeted marketing, restricted content delivery and location-based security check. Although existing delay-based IP geolocation techniques work well in some developed countries, the assumption of a strong delay-distance correlation that they often rely on may fail in many developing countries for poor network connectivity. To obtain more accurate delay-based IP geolocation results in poor-connected networks, an IP geolocation method based on rich-connected sub-networks is presented in this paper. At first, the network connectivity of one particular network is measured. Next, if the network is poor-connected, the method will divide it and search rich-connected sub-networks based on properties such as ISP and location information of probing hosts and landmarks. Then, based on the discovered rich-connected sub-networks, landmarks and probing hosts are deployed and selected to measure data such as delay, distance and topology, etc. At last, the location of the target host is estimated by modifying the processes of existing delay-based IP geolocation techniques based on selected landmarks and probing hosts. The experiments which cover 30 provinces and 3 major ISPs of China show that the proposed method can find corresponding rich-connected sub-networks and significantly improve the performance of existing typical delay-based IP geolocation techniques in an actual poor-connected network.

关键词： Geology IP networks Cities and towns Delays Correlation Internet Databases

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Search for Continuous Gravitational Waves from Known Pulsars in the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run

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Astrophysical Journal 2025年第2期983卷 99-99页

作者： Abac, A.G. Abbott, R. Abouelfettouh, I. Acernese, F. Ackley, K. Adhicary, S. Adhikari, N. Adhikari, R.X. Adkins, V.K. Agarwal, D. Agathos, M. Aghaei Abchouyeh, M. Aguiar, O.D. Aguilar, I. Aiello, L. Ain, A. Ajith, P. Akutsu, T. Albanesi, S. Alfaidi, R.A. Al-Jodah, A. Alléné, C. Allocca, A. Al-Shammari, S. Altin, P.A. Alvarez-Lopez, S. Amato, A. Amez-Droz, L. Amorosi, A. Amra, C. Ananyeva, A. Anderson, S.B. Anderson, W.G. Andia, M. Ando, M. Andrade, T. Andres, N. Andrés-Carcasona, M. Andrić, T. Anglin, J. Ansoldi, S. Antelis, J.M. Antier, S. Aoumi, M. Appavuravther, E.Z. Appert, S. Apple, S.K. Arai, K. Araya, A. Araya, M.C. Areeda, J.S. Argianas, L. Aritomi, N. Armato, F. Arnaud, N. Arogeti, M. Aronson, S.M. Ashton, G. Aso, Y. Assiduo, M. Assis de Souza Melo, S. Aston, S.M. Astone, P. Attadio, F. Aubin, F. AultONeal, K. Avallone, G. Babak, S. Badaracco, F. Badger, C. Bae, S. Bagnasco, S. Bagui, E. Baier, J.G. Baiotti, L. Bajpai, R. Baka, T. Ball, M. Ballardin, G. Ballmer, S.W. Banagiri, S. Banerjee, B. Bankar, D. Baral, P. Barayoga, J.C. Barish, B.C. Barker, D. Barneo, P. Barone, F. Barr, B. Barsotti, L. Barsuglia, M. Barta, D. Bartoletti, A.M. Barton, M.A. Bartos, I. Basak, S. Basalaev, A. Bassiri, R. Basti, A. Bates, D.E. Bawaj, M. Baxi, P. Bayley, J.C. Baylor, A.C. Baynard, P.A. Bazzan, M. Bedakihale, V.M. Beirnaert, F. Bejger, M. Belardinelli, D. Bell, A.S. Benedetto, V. Benoit, W. Bentley, J.D. Ben Yaala, M. Bera, S. Berbel, M. Bergamin, F. Berger, B.K. Bernuzzi, S. Beroiz, M. Bersanetti, D. Bertolini, A. Betzwieser, J. Beveridge, D. Bevins, N. Bhandare, R. Bhardwaj, U. Bhatt, R. Bhattacharjee, D. Bhaumik, S. Bhowmick, S. Bianchi, A. Bilenko, I.A. Billingsley, G. Binetti, A. Bini, S. Birnholtz, O. Biscoveanu, S. Bisht, A. Bitossi, M. Bizouard, M.-A. Blackburn, J.K. Blagg, L.A. Blair, C.D. Blair, D.G. Bobba, F. Bode, N. Boileau, G. Boldrini, M. Bolingbroke, G.N. Bolliand, A. Bonavena, L.D. Bondarescu, R. Bondu, F. Bonilla, E. Bonilla, M.S. Bonino, A. Bonnand, R. Booker, P. Borchers, A. Boschi, V. Bose, S. Boss Max Planck Institute for Gravitational Physics (Albert Einstein Institute) Potsdam D-14476 Germany LIGO Laboratory California Institute of Technology Pasadena 91125 CA United States LIGO Hanford Observatory Richland 99352 WA United States Dipartimento di Farmacia Università di Salerno Fisciano Salerno I-84084 Italy INFN Sezione di Napoli Napoli I-80126 Italy University of Warwick Coventry CV 47AL United Kingdom The Pennsylvania State University University Park 16802 PA United States University of Wisconsin-Milwaukee Milwaukee 53201 WI United States Louisiana State University Baton Rouge 70803 LA United States Université Catholique de Louvain Louvain-la-Neuve B-1348 Belgium Inter-University Centre for Astronomy and Astrophysics Pune 411007 India Queen Mary University of London London E1 4NS United Kingdom Department of Physics and Astronomy Sejong University 209 Neungdong-ro Gwangjin-gu Seoul 143-747 South Korea Instituto Nacional de Pesquisas Espaciais São José dos Campos São Paulo 12227-010 Brazil Stanford University Stanford 94305 CA United States Università di Roma Tor Vergata Roma I-00133 Italy INFN Sezione di Roma Tor Vergata Roma I-00133 Italy Cardiff University Cardiff CF24 3AA United Kingdom Universiteit Antwerpen Antwerpen 2000 Belgium International Centre for Theoretical Sciences Tata Institute of Fundamental Research Bengaluru 560089 India Gravitational Wave Science Project National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan Advanced Technology Center National Astronomical Observatory of Japan 2-21-1 Osawa Mitaka City Tokyo 181-8588 Japan INFN Sezione di Torino Torino I-10125 Italy Theoretisch-Physikalisches Institut Friedrich-Schiller-Universität Jena Jena D-07743 Germany Dipartimento di Fisica Università degli Studi di Torino Torino I-10125 Italy SUPA University of Glasgow Glasgow G12 8QQ United Kingdom OzGrav University of Western Australia Crawley 6009 WA

Continuous gravitational waves (CWs) emission from neutron stars carries information about their internal structure and equation of state, and it can provide tests of general relativity. We present a search for CWs from a set of 45 known pulsars in the first part of the fourth LIGO-Virgo-KAGRA observing run, known as O4a. We conducted a targeted search for each pulsar using three independent analysis methods considering single-harmonic and dual-harmonic emission models. We find no evidence of a CW signal in O4a data for both models and set upper limits on the signal amplitude and on the ellipticity, which quantifies the asymmetry in the neutron star mass distribution. For the single-harmonic emission model, 29 targets have the upper limit on the amplitude below the theoretical spin-down limit. The lowest upper limit on the amplitude is 6.4 × 10^-27 for the young energetic pulsar J0537-6910, while the lowest constraint on the ellipticity is 8.8 × 10^-9 for the bright nearby millisecond pulsar J0437-4715. Additionally, for a subset of 16 targets, we performed a narrowband search that is more robust regarding the emission model, with no evidence of a signal. We also found no evidence of nonstandard polarizations as predicted by the Brans-Dicke theory. © 2025. The Author(s). Published by the American Astronomical Society.

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Hidden System APIs Based Code Obfuscation

Hidden System APIs Based Code Obfuscation

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2015 International Conference on Mechanical,Electronic and Information Technology engineering

作者： Fei Xiang Fenlin Liu Bin Lu Daofu Gong Zhengzhou Information Science and Technology Institute State Key Laboratory of Mathematical Engineering and Advanced Computing

For the problem that static disassembly can expose system API calls in programs, this paper proposes a kind of code obfuscation aimed at hiding system API calls from reverse analysis. The algorithm is implemented by creating a system API address table and constructing secret index variables. During execution, the program looks up the table for the correct API to call, thus keeping the semantic unchanged. Analysis and experiments show that the algorithm can effectively protect system API calls from static reverse analysis.

关键词： static disassembly reverse analysis code obfuscation system API address table

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Exploiting transmission lines on heterogeneous networks-on-chip to improve the adaptivity and efficiency of cache coherence 15

Exploiting transmission lines on heterogeneous networks-on-c...

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9th IEEE/ACM International Symposium on Networks-on-Chip, NOCS 2015

作者： Hu, Qi Liu, Peng Huang, Michael C. Xie, Xiang-Hui College of Information Science and Electronic Engineering Zhejiang University Hangzhou310027 China Dept. of Electrical and Computer Engineering University of Rochester RochesterNY14627 United States State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi214125 China

ISBN: (纸本)9781450333962

Emerging heterogeneous interconnects have shown lower latency and higher throughput, which can improve the efficiency of communication and create new opportunities for memory system designs. In this paper, transmission lines are employed as a latency-optimized network and combined with a packet-switched network to create heterogeneous interconnects improving the efficiencies of on-chip communication and cache coherence. We take advantage of this heterogeneous interconnect design, and keep cache coherence adaptively based on data locality. Different type of messages are adaptively directed through selected medium of the heterogeneous interconnects to enhance cache coherence effectiveness. Compared with a state-of-the-art coherence mechanism, the proposed technique can reduce the coherence overhead by 24%, reduce the network energy consumption by 35%, and improve the system performance by 25% on a 64-core system. Copyright is held by the owner/author(s).

关键词： Heterogeneous networks

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Real-time rendering for sea water based on height field model and light interaction

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ICIC Express Letters, Part B: Applications 2016年第9期7卷 1975-1981页

作者： Xu, Jie Zhang, Yang Fu, Jinhua School of Software Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou450002 China College of Mathematics and Information Science Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou450002 China State Key-Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Information Science and Technology Institute Zhengzhou450000 China School of Computer and Communication Engineering Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou450002 China

Real-time simulation of liquids like sea water is an important task nowadays in the field of computer graphics. In this paper, combined with simulation of light interaction, rendering of sea water at interactive rates is implemented based on the height field model. The focus of the sea rendering is a real-time and graphically realistic simulation, capable of handling different types of illumination such as refraction and reflection. In order to improve the realism of sea water, surface details are efficiently acquired by normal mapping. The effects of lighting and shading via our method are more obvious and clear in such as reflection, refraction, foam and soft shadow, which are in accord with physical interaction between light and water. © 2016 ICIC International.

关键词： Refraction

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Pressure-induced Superconductivity in the three-component fermion topological semimetal molybdenum phosphide

arXiv

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arXiv 2017年

作者： Chi, Zhenhua Chen, Xuliang An, Chao Yang, Liuxiang Zhao, Jinggeng Feng, Zili Zhou, Yonghui Zhou, Ying Gu, Chuanchuan Zhang, Bowen Yuan, Yifang Kenney-Benson, Curtis Yang, Wenge Wu, Gang Wan, Xiangang Shi, Youguo Yang, Xiaoping Yang, Zhaorong Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei230031 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China University of Science and Technology of China Hefei230026 China Beijing100094 China Department of Physics Harbin Institute of Technology Harbin150080 China Natural Science Research Center Academy of Fundamental and Interdisciplinary Sciences Harbin Institute of Technology Harbin150080 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Department of Physics and Engineering Zhengzhou University Zhengzhou450052 China HPCAT Geophysical Laboratory Carnegie Institution of Washington ArgonneIL60439 United States Shanghai201203 China Institute of High Performance Computing 1 Fusionopolis Way 16-16 Connexis Singapore138632 Singapore National Laboratory of Solid State Microstructures College of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

Topological semimetal, a novel state of quantum matter hosting exotic emergent quantum phenomena dictated by the non-trivial band topology, has emerged as a new frontier in condensed-matter physics. Very recently, a coexistence of triply degenerate points of band crossing and Weyl points near the Fermi level was theoretically predicted and immediately experimentally verified in single crystalline molybdenum phosphide (MoP). Here we show in this material the high-pressure electronic transport and synchrotron X-ray diffraction (XRD) measurements, combined with density functional theory (DFT) calculations. We report the emergence of pressure-induced superconductivity in MoP with a critical temperature Tc of about 2 K at 27.6 GPa, rising to 3.7 K at the highest pressure of 95.0 GPa studied. No structural phase transitions is detected up to 60.6 GPa from the XRD. Meanwhile, the Weyl points and triply degenerate points topologically protected by the crystal symmetry are retained at high pressure as revealed by our DFT calculations. The coexistence of three-component fermion and superconductivity in heavily pressurized MoP offers an excellent platform to study the interplay between topological phase of matter and superconductivity. Copyright © 2017, The Authors. All rights reserved.

关键词： Quantum theory

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High performance porous iron oxide-carbon nanotube nanocomposite as an anode material for lithium-ion batteries

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Electrochimica Acta 2016年 212卷 179-186页

作者： Qian Lin Jie Wang Yijun Zhong Jaka Sunarso Moses O. Tadé Li Li Zongping Shao Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering Nanjing Tech University No.5 Xin Mofan Road Nanjing 210009 PR China College of Chemical Engineering Nanjing Forestry University Nanjing 210037 PR China Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga 93350 Kuching Sarawak Malaysia Department of Chemical Engineering Curtin University Perth WA 6845 Australia Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) State Key Laboratory of Materials-Oriented Chemical Engineering College of Energy Nanjing Tech University No.5 Xin Mofan Road Nanjing 210009 PR China

Here, we showed that relatively high content of Fe 3 O 4 nanoparticles (up to 83 wt. %) can be homogeneously dispersed into carbon nanotubes (CNTs) conductive networks using non-aqueous media by refluxing method. Three different Fe 3 O 4 -CNTs composites were prepared, i.e., Fe 3 O 4 -CNTs-50, Fe 3 O 4 -CNTs-80 and Fe 3 O 4 -CNTs-90 that contain increasing amount of Fe 3 O 4 from 50 wt. % to 83 wt. % and to 89 wt. %. These composites have higher surface area and higher pore volume than Fe 3 O 4 component due to CNTs content. The best composite, i.e., Fe 3 O 4 -CNTs-80 demonstrated negligible capacity loss up to 100 cycles and high discharge capacity of 930 mA h g −1 at 100th cycle and 100 mA g −1 current discharge rate. This composite also exhibited excellent rate capability where up to the 78.8% of original capacity can be retained at high current discharge rate of 1000 mA g −1 . These performances were enabled by a unique porous architecture based on homogenous dispersion of Fe 3 O 4 nanoparticles into CNTs networks that leads to short Li + diffusion path, high electric conductivity and buffering space to accommodate large volume change of Fe 3 O 4 component during the charge-discharge processes.

关键词： Anode Carbon nanotubes Fe 3 O 4 High performance Lithium-ion batteries

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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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IEEE International Conference on Software engineering and Service Sciences (ICSESS)

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

ISBN: (纸本)9781479983544

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： Algorithm design and analysis Finite element analysis Graph theory File systems Semantics Probability Manganese

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Exploiting Pure Superword Level Parallelism for Array Indirections

Exploiting Pure Superword Level Parallelism for Array Indire...

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International Symposium on Parallel Architectures, Algorithms and Programming (PAAP)

作者： Huihui Sun Rongcai Zhao Wei Gao Yi Gong Gang Li State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou China Information Engineering University Zhengzhou China

SIMD (Single Instruction Multiple Data) extension units are ubiquitous in modern processors. Array indirections raise several challenges for SIMD vectorization including disjoint memory access, unknown alignment and dependence cycle. Existing SIMD automatic vectorization methods fail to handle these challenges very well. This paper presents a new method exploiting Pure SLP (Superword Level Parallelism) to address these problems. Dependence equation is rewritten to work out the dependence testing for index array. To address the problem of non-aligned and disjoint challenges, data alignment in recombinant registers and redundant statements are employed respectively. In addition, a precise cost model is proposed to guarantee positive benefits. Experiments on three typical array indirection applications extracted from SPEC2006 benchmarks verified the validity of this method.

关键词： Arrays Testing Indexes Parallel processing mathematical model Registers Program processors

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An Algorithm of City-Level Landmark Mining Based on Internet Forum

An Algorithm of City-Level Landmark Mining Based on Internet...

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International Conference on Network-Based Information Systems (NBIS)

作者： Guang Zhu Xiangyang Luo Fenlin Liu Jingning Chen State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Science and Technology Institute Zhengzhou China

Density and accuracy of network entity landmarks are an important foundation of IP geolocation. For the existing problems of the limited quantity and low reliability of landmarks mined by current landmark mining methods, an algorithm of city-level landmark mining based on Internet forum is proposed in this paper. Firstly, the basic principle of Web-Based landmark mining methods and their existing flaws are analyzed, and then according to existing a huge amount of individual IP addresses in the Internet forums, a technical framework of network entity landmark mining based on the Internet forum is given, Next, the Internet forum selection strategy, IP addresses extraction, IP addresses screening and other major processing steps are described respectively for two major parts of the framework, including landmark extraction algorithm and landmark evaluation algorithm. The classic GeoTrack, a network entity geolocation algorithm, is improved and used for evaluating the candidate landmarks. Finally, the feasibility of our framework and algorithm are studied from 2 aspects: forum selection strategy, and Forum-Based landmark mining algorithm. Experimental results based on 27 Internet forums of 3 types forums in 3 cities show that compared with the classic Web-Based landmark mining methods, the proposed algorithm can not only mine huge amounts of city-level landmarks, but also improve the city-level network entity geolocation accuracy obviously.

关键词： IP networks Geology Web servers Reliability Data mining HTML

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