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Method for constructing multi-dimensional feature map of malicious code

Journal of Physics: Conference Series 2021年第4期1748卷

作者： Haocong Ma Ji Zhang Junhua Zhou Xiang Zhai Junjie Xue Hang Ji State Key Laboratory of Intelligent Manufacturing System Technology Beijing Institute of Electronic System Engineering Beijing 100854 China Beijing Complex Product Advanced Manufacturing Engineering Research Center Beijing simulation Center Beijing 100854 China Science and Technology on Space System Simulation Laboratory Beijing Simulation Center Beijing 100854 China School of Computer Science and Technology Beijing Institute of Technology Beijing 100081 China

Malicious code is characterized by a large number of types, rapid increase in number, continuous update of transmission routes, and continuous enhancement of back analysis and back detection methods. Therefore, how to effectively detect and analyze malicious code has been a problem of great concern. This paper studies the features of binary file and disassembly file of malicious code, introduces the concept of information gain, and proposes a method to construct the multi-dimensional characteristic graph of malicious code. Finally, the convolutional neural network is used to classify the multi-dimensional feature graph of malicious code, which provides a new idea for the feature extraction of malicious code.

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Is the existence of a J/ψJ/ψbound state plausible?

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Science Bulletin 2021年第24期66卷 2462-2470,M0003页

作者： Xiang-Kun Dong Vadim Baru Feng-Kun Guo Christoph Hanhart Alexey Nefediev Bing-Song Zou CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institut für Theoretische Physik Ⅱ Ruhr-Universität BochumBochum D-44780Germany Institute for Theoretical and Experimental Physics NRC“Kurchatov Institute” Moscow 117218Russia Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichJülich D-52425Germany P.N.Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991Russia Moscow Institute of Physics and Technology Moscow 141700Russia School of Physics Central South UniversityChangsha 410083China

In a recent measurement LHCb reported pronounced structures in the J/ψJ/ψ*** of the various possible explanations of those is that they emerge from non-perturbative interactions of vector *** is thus important to understand whether it is possible to form a bound state of two charmonia interacting through the exchange of gluons,which hadronise into two pions at the longest *** this paper,we demonstrate that,given our current understanding of hadron-hadron interactions,the exchange of correlated light mesons(pions and kaons)is able to provide sizeable attraction to the di-J/ψsystem,and it is possible for two J/ψmesons to form a bound *** a side result we find from an analysis of the data for theψ/(2 S)J/ψππtransition including bothππand KK final state interactions an improved value for theψ(2 S)→J/ψtransition chromo-electric polarisability:|αψ(2 S)J/ψ|=(1.8±0.1)GeV-3,where the uncertainty also includes the one induced by the final state interactions.

关键词： Fully-charm tetraquark Hadronic molecule Exotic hadron Dispersion relation

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Magnetic skyrmion braids

arXiv

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arXiv 2021年

作者： Zheng, Fengshan Rybakov, Filipp N. Kiselev, Nikolai S. Song, Dongsheng Kovács, András Du, Haifeng Blügel, Stefan Dunin-Borkowski, Rafal E. Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute Forschungszentrum Jülich Jülich52425 Germany Department of Physics KTH-Royal Institute of Technology StockholmSE-10691 Sweden Peter Grünberg Institute Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany Information Materials and Intelligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Institutes of Physical Science and Information Technology Anhui University Hefei230601 China HefeiAnhui Province230031 China

Filamentary textures can take the form of braided, rope-like superstructures in nonlinear media such as plasmas and superfluids1-3. The formation of similar superstructures in solids has been predicted, for example from flux lines in superconductors4. However, their observation has proved challenging5,6. Here, we use electron microscopy and numerical methods to reveal braided superstructures of magnetic skyrmions7-10 in thin crystals of B20-type FeGe. Their discovery opens the door to applications of rich topological landscapes of geometric braids11,12 in magnetic solids. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetism

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Rely-Guarantee Reasoning about Messaging System for Autonomous Vehicles

Rely-Guarantee Reasoning about Messaging System for Autonomo...

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Theoretical Aspects of Software Engineering (TASE)

作者： Wenjing Xu Yongwang Zhao Dianfu Ma YuXin Zhang Qian Xiao State Key Laboratory of Software Development Environment School of Computer Science and Engineering Beihang Univerisity Beijing China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing China State Key Laboratory of Automotive Simulation and Control College of Automotive Engineering Jilin University Jilin China School of Computer Science and Technology Guizhou University Guiyang China

Messaging system as a communicating infrastructure is a safety-critical component of autonomous vehicles. For the purpose of safety certification of Level 4 autonomous driving systems, its necessary to provide a formally verified specification of messaging systems. This paper presents a realistic case study using the PiCore rely-guarantee framework to formally verify the DGPS (Differential Global Positioning System) of UISEE autonomous driving systems. We first create an axiom model of messaging systems by extending PiCore, which is reusable for concrete applications. The model supports dynamic configuration of message buffers as well as the automatic generation of the rely and guarantee conditions for compositional reasoning. It is instantiated when developing the formal specification of DGPS. Then, we use the rely-guarantee proof system of PiCore to verify the functional correctness and invariant of DGPS. The specification and its proof provide a strong evidence for the ongoing safety certification of DGPS.

关键词： Cognition Safety Formal specifications Vehicle dynamics Autonomous vehicles Certification Global Positioning System

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A Study on the Correlation Between Poles and Cuts in ππ Scattering

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Communications in Theoretical Physics 2019年第11期71卷 1309-1318页

作者： Ling-Yun Dai Xian-Wei Kang Tao Luo School of Physics and Electronics Hunan University College of Nuclear Science and Technology Beijing Normal University Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) and Institute of Modern Physics Fudan University Helmholtz Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Universit?t Bonn Institute for Advanced Simulation Institut f¨ur Kernphysik and Jülich Center for Hadron Physics Forschungszentrum Jülich

In this paper we propose a dispersive method to describe two-body scattering with unitarity imposed. This approach is applied to elastic ππ scattering. The amplitudes keep single-channel unitarity and describe the experimental data well, and the low-energy amplitudes are consistent with that of chiral perturbation theory. The pole locations of the σ, f0(980), ρ(770) and f2(1270) and their couplings to ππ are obtained. A virtual state appearing in the isospin-two S-wave is confirmed. The correlations between the left(and right) hand cut and the poles are discussed. Our results show that the poles are more sensitive to the right hand cut rather than the left hand cut. The proposed method could be used to study other two-body scattering processes.

关键词： dispersion relations partial-wave analysis chiral lagrangian meson production

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The cutting performance of coated and uncoated segmented flute routers with tool wear progression in milling multidirectional CFRP composites

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Wear 2025年 578-579卷

作者： Yanli He Yuxiang Fan Depan Wang Redouane Zitoune Jing Luo Junde Qi Key Laboratory of High Performance Manufacturing for Aero Engine (Ministry of Industry and Information Technology) School of Mechanical Engineering Northwestern Polytechnical University Xi'an Shaanxi 710072 PR China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine (Ministry of Education) School of Mechanical Engineering Northwestern Polytechnical University Xi'an Shaanxi 710072 PR China Jiangxi Hongdu Aviation Industry Group Nanchang Jiangxi PR China Institut Clément Ader (ICA) UMR-CNRS 5312 Université de Toulouse Toulouse 31077 France

Carbon fiber-reinforced polymer (CFRP) components typically undergo mechanical milling for the dimensional and form accuracy. Tool wear is one of the concerns in milling CFRPs, as the cutting performance and the machinability are significantly affected by the tool wear progression. However, the influence of cutting parameters on tool wear varies across different studies in the literature, with a lack of research on the wear behavior of segmented flute tools considering both tool material and cutting parameters. In this study, both the coated and uncoated segmented flute routers were employed in the milling of CFRPs with various parameters. The cutting performance, including the cutting force, temperature, and machining quality, along with the tool wear progression were analyzed. The results indicate that the effects of cutting speed on tool wear differ among different tools. Although the tool wear both influences and is influenced by the process load, it appears that the impact of tool wear on the process load is more pronounced than the reverse. Tool wear progression shows a strong correlation with the increasing rates of the cutting force, temperature or surface roughness progression, whereas wear behavior cannot be explained simply by the macro magnitudes of the process loads, suggesting the importance of wear mechanisms investigation from a micro-mechanical perspective. By revealing the variation in machinability with tool wear progression, this study may support the optimal selection of cutting tools and parameters for the whole milling process concerning machining efficiency, quality, and tool life.

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Selective excitation of a three-dimensionally oriented single plasmonic dipole

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Photonics Research 2019年第6期7卷 693-698页

作者： FAJUN XIAO GUANGLIN WANG XUETAO GAN WUYUN SHANG SHIYIN CAO WEIREN ZHU TING MEI MALIN PREMARATNE JIANLIN ZHAO MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Shaanxi Key Laboratory of Optical Information Technology School of Science Northwestern Polytechnical University Xi'an 710129 China Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC 3800 Australia

We experimentally demonstrate a scheme to deterministically excite a three-dimensionally oriented electric dipole in a single Au nanosphere by using a tightly focused radially polarized beam whose focal field possesses polarization states along three-dimensional(3D) orientations owing to the spatial overlap between longitudinal and radial electric field components. Experiment observations indicate that the orientation of an excited dipole moment gradually changes from out-of-plane to in-plane when the nanosphere is moved away from the beam center, which is reconfirmed by full-wave simulations. Moreover, rigorous calculation based on Mie theory reveals that a reduced effective ambient permittivity accompanies the rotation of the dipole moment, leading to a blue-shifted and narrowed resonance peak. We envision that our results could find applications in detecting the 3D orientation of isolated molecules and benefit the fine manipulation of light–matter interactions at the single-molecule level.

关键词： Selective excitation plasmonic dipole

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Fatigue crack growth behaviors in novel TC32 titanium alloy with bimodal and basket-wave microstructures

Fatigue crack growth behaviors in novel TC32 titanium alloy ...

引用

Chinese Materials Conference, 2018

作者： Li, Mingbing Zhu, Zhishou Wang, Xinnan Zhu, Liwei Shang, Guoqiang Li, Jing Liu, Gechen Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys Institute of Aeronautical Materials Beijing 100095 China

ISBN: (纸本)9783035713848

This article investigated the fatigue crack growth behaviors in the novel TC32 titanium alloy with bimodal and basket-weave microstructures, which were respectively obtained by the convectional (α+β) phase forging and quasi-β forging processing. The results showed that at the same level of tensile performance, the basket-weave microstructure had a lower fatigue crack growth rate than the bimodal microstructure, as the basket-weave microstructure had a more tortuous crack path, a rougher fracture surface and more secondary cracks. All these served to improve the fatigue crack growth resistance, which attributed largely to the effects of crack closure. Moreover, secondary cracks grew primarily along the α/β interfaces for the basket-weave microstructure but directly went across the colony-type lamellar (α+β) phase and the primary α phase without obvious regularity for the bimodal microstructure. © 2019 Trans Tech Publications, Switzerland.

关键词： Titanium alloys

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Observation of the orbital Rashba-Edelstein magnetoresistance

arXiv

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arXiv 2021年

作者： Ding, Shilei Liang, Zhongyu Go, Dongwook Yun, Chao Xue, Mingzhu Liu, Zhou Becker, Sven Yang, Wenyun Du, Honglin Wang, Changsheng Yang, Yingchang Jakob, Gerhard Kläui, Mathias Mokrousov, Yuriy Yang, Jinbo State Key Laboratory for Mesoscopic Physics School of Physics Peking University Beijing100871 China Peter Grünberg Institut Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany Institute of Physics Johannes Gutenberg-University Mainz Staudingerweg 7 Mainz55128 Germany Graduate School of Excellence Materials Science in Mainz Mainz55128 Germany Center for Quantum Spintronics Department of Physics Norwegian University of Science and Technology TrondheimNO-7491 Norway Collaborative Innovation Center of Quantum Matter Beijing100871 China Beijing Key Laboratory for Magnetoelectric Materials and Devices Beijing100871 China

We report the observation of magnetoresistance (MR) originating from the orbital angular momentum transport (OAM) in a Permalloy (Py) / oxidized Cu (Cu*) heterostructure: the orbital Rashba-Edelstein magnetoresistance. The angular dependence of the MR depends on the relative angle between the induced OAM and the magnetization in a similar fashion as the spin Hall magnetoresistance (SMR). Despite the absence of elements with large spin-orbit coupling, we find a sizable MR ratio, which is in contrast to the conventional SMR which requires heavy elements. By varying the thickness of the Cu* layer, we confirm that the interface is responsible for the MR, suggesting that the orbital Rashba-Edelstein effect is responsible for the generation of the OAM. Through Py thickness-dependence studies, we find that the effective values for the spin diffusion and spin dephasing lengths of Py are significantly larger than the values measured in Py / Pt bilayers, approximately by the factor of 2 and 4, respectively. This implies that another mechanism beyond the conventional spin-based scenario is responsible for the MR observed in Py / Cu* structures - originated in a sizeable transport of OAM. Our findings not only unambiguously demonstrate current-induced torques without using any heavy elements via the OAM channel but also provide an important clue towards the microscopic understanding of the role that OAM transport can play for magnetization dynamics. Copyright © 2021, The Authors. All rights reserved.

关键词： Nickel alloys

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Quadrupole deformation of C16 studied by proton and deuteron inelastic scattering

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Physical Review C 2020年第2期101卷 024601-024601页

作者： Y. Jiang J. L. Lou Y. L. Ye Y. Liu Z. W. Tan W. Liu B. Yang L. C. Tao K. Ma Z. H. Li Q. T. Li X. F. Yang J. Y. Xu H. Z. Yu J. X. Han S. W. Bai S. W. Huang G. Li H. Y. Wu H. L. Zang J. Feng Z. Q. Chen Y. D. Chen Q. Yuan J. G. Li B. S. Hu F. R. Xu J. S. Wang Y. Y. Yang P. Ma Q. Hu Z. Bai Z. H. Gao F. F. Duan L. Y. Hu J. H. Tan S. Q. Sun Y. S. Song H. J. Ong D. T. Tran D. Y. Pang C. X. Yuan School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Institute of Modern Physics China Academy of Science Lanzhou 730000 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin 150001 China Research Center for Nuclear Physics Osaka University Osaka 567-0047 Japan School of Physics Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen University Zhuhai 519082 China

New measurements of proton/deuteron elastic and inelastic scattering to the 21+ state of the neutron-rich nucleus C16 have been performed at Radioactive Ion Beam Line in Lanzhou (RIBLL) in inverse kinematics. The angular distributions of elastic scattering were well reproduced by the systematic optical potential with normalization factors for the depths of real and imaginary parts. The neutron and proton deformation lengths of δn=1.25±0.30 fm and δp=1.07±0.26 fm were extracted from the inelastic scattering data. The ratio of neutron and proton matrix element Mn/Mp=1.95±0.47 was determined from the two different probes. Within error bar, this result is in fair agreement with the previous measurements, demonstrating that the combination of proton and deuteron inelastic scattering offers a useful method to extract Mn/Mp for the even-even nuclei. Most of the theoretical predictions by the shell model using the MK, WBT, WBT*, and YSOX interactions in p−sd model space and by the ab initio in-medium similarity renormalization group are close to these experimental results.

关键词： Direct reactions Nuclear reactions Nuclear structure & decays 6 ≤ A ≤ 19 Shell model

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