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arXiv 2019年

作者： Huang, Wen Zhou, Yi Yao, Hong Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen 518055 China Institute for Advanced Study Tsinghua University Beijing 100084 China Center for Quantum Computing Peng Cheng Laboratory Shenzhen 518005 China Beijing National Laboratory for Condensed Matter Physics & Institute of Physics Chinese Academy of Sciences Beijing 100190 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Low Dimensional Quantum Physics Tsinghua University Beijing 100084 China

The unconventional superconductivity in Sr2RuO4 continues to defy a unified interpretation. In this paper, we focus on some novel aspects of its superconducting pairing by exploiting the orbital degree of freedom in this material. The multi-orbital nature, combined with the symmetry of the orbitals involved, leads to a plethora of exotic Cooper pairings not accessible in single-orbital systems. In the presence of finite spin-orbit coupling (SOC), spin-singlet and spin-triplet pairings are entangled, thus the spin susceptibility is generically expected to be suppressed below Tc. Essential physics is illustrated first using a two-orbital model with dxz- and dyzorbitals. We classify the gap functions according to the underlying lattice symmetries, analyze the effective theories of a few representative pairings, and make connections to Sr2RuO4 in the course. For completeness, the classification is generalized to the three-orbital model involving the dxy-orbital as well. The orbital-basis approach distinguishes from the itinerant-band description for Sr2RuO4, and hence offers an alternative perspective to investigate its enigmatic superconducting state. Copyright © 2019, The Authors. All rights reserved.

关键词： Strontium compounds

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Intrusion Detection Algorithm Based on Convolutional Neural Network

Intrusion Detection Algorithm Based on Convolutional Neural ...

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2017 4th International Conference on engineering Technology and Application (ICETA 2017)

作者： Yuchen Liu Shengli Liu Xing Zhao State Key Laboratory of Mathematical Engineering and Advanced Computing

A periodic load balancing method is proposed according to the load imbalance of network server in a clustered system of high concurrency. It is divided into different load periods based on the load condition of server node. Corresponding load balancing strategy is adopted for each period that the strategy of fast select is used in the period of small load while the server node with stable response time is first adopted in the period of large load. Periodic load strategy avoids the load imbalance caused by the single load strategy. It can be known from the experimental comparison that the improved periodic load balancing strategy is superior to the load balancing strategy of weighted least connection.

关键词： intrusion detection system deep learning convolution neural network

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VBD-MF:A Block Device to Monitor the File System of Virtual Machine

VBD-MF:A Block Device to Monitor the File System of Virtual ...

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2017 International Conference on Mathematics, Modelling and Simulation Technologies and Applications（MMSTA 2017)

作者： Rui LOU Lie-hui JIANG Yi-sen WANG State Key Laboratory of Mathematical Engineering and Advanced Computing

The virtual block device is the data carrier of virtual machine(VM) and user information,while the file system is the ultimate goal of many *** proposed a security device named virtual block device mapping to file(VBD-MF) that can translate block-level operations into file-level ones by building a mapping from blocks to ***-MF could provide an out-of-VM way to monitor the file system with no modification on the code of virtual machine monitor(VMM)and guest OS,and it also provided other security tools and methods with direct interface to operate the file *** implemented a prototype on Linux and *** evaluation shows that VBD-MF has a better capability of monitoring with some loss on performance of read and *** to the traditional monitoring of host-based file system,VBD-MF has a better hidden and safety property.

关键词： Virtualization Virtual block device File system monitoring File access control

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Cross-Platform Embedded-System Dynamic Information Acquisition Method

Cross-Platform Embedded-System Dynamic Information Acquisiti...

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2017 2nd International Conference on Computer engineering,Information Science and Internet Technology(CII 2017)

作者： YISEN WANG JING JING JIANJING SHEN WEIYU DONG State Key Laboratory of Mathematical Engineering and Advanced Computing

With the widespread application of embedded devices,embedded software vulnerabilities and oriented attacks to embedded system are also *** being wellknown,the hardware architecture of the embedded devices is heterogeneous,and the software stacks on them are customizable and flexible as *** dynamic information extraction and analysis technologies have been successfully used for general platform in vulnerability mining,malicious code detection and so on,its usage on embedded system lags behind *** paper provides(1) a CrossPlatform-Dynamic Instrumentation Framework,which,by leveraging an extensible intermediate code module and a semantic constraint database,decouples the instrumentation plugins from underlying hardware and OS;(2) a set of instrumentation interfaces which may be implemented by plugins to extract runtime state of various code granularity;(3) ability of system semantic introspection to extract processes and modules information(system semantic views),by using system attribute description files and abstract state extraction *** with TEMU and DECAF,our method shows more advantages in performance of abstract state extraction,and reducing the time and memory overhead.

关键词： Cross-Platform Embedded-System Dynamic Information Acquisition Method

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A Technique for Bytecode Decompilation of PLC Program

A Technique for Bytecode Decompilation of PLC Program

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2017 IEEE 第2届先进信息技术,电子与自动化控制国际会议(IAEAC 2017)

作者： Xuefeng LV Yaobin Xie Xiaodong Zhu Lu Ren State Key Laboratory of Mathematical Engineering and Advanced Computing

Program logical controllers(PLCs) are the kernel equipment of industrial control system(ICS) as they directly monitor and control industrial processes. Recently, ICS is suffering from various cyber th

ISBN: (纸本)9781467389808

关键词： Programmable logical controller Bytecode Decompilation Mapping rules address byte decompilation Programmable logic controllers Integrated circuits

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An Efficient Improved Model for Tor Anonymous Network

An Efficient Improved Model for Tor Anonymous Network

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2017 4th International Conference on engineering Technology and Application (ICETA 2017)

作者： Yitong Meng Yimin Liu Jinlong Fei Yuefei Zhu State Key Laboratory of Mathematical Engineering and Advanced Computing

In order to improve the transmission efficiency, security and anonymity of Tor anonymous communication system, this paper analyzes the efficiency of Tor anonymous system through research and analysis of the security and vulnerability of transmission mechanism, encryption rules and node distribution of Tor anonymous network system, and then proposes an efficient improved model EFTAN for Tor anonymous network, and finally obtains a network system that can improve the efficiency, security and anonymity of the anonymous communication.

关键词： Tor efficiency security anonymity vulnerability improved model

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Route Intrusion Detection Based on Long Short Term Memory Recurrent Neural Network

Route Intrusion Detection Based on Long Short Term Memory Re...

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2017 2nd International Conference on Computer engineering,Information Science and Internet Technology(CII 2017)

作者： YUCHEN LIU SHENGLI LIU YANG WANG State Key Laboratory of Mathematical Engineering and Advanced Computing

With the rapid development and extensive use of the Internet,network security is the key point of the current research of computer *** router is the key interconnection equipment in the Internet system,and it is necessary to improve the security of the router *** routing protocol is used in the packet switching *** communication is implemented by each switching node in the network to forward data *** present,most of the router intrusion detection systems are based on the machine learning *** paper proposes a Long Short Term Memory(LSTM) architecture applied to the Recurrent Neural Network(RNN),and uses the KDD Cup 1999 data set to train the IDS *** performance testing,the ability to efficiently and accurately classify network traffic into attacks and normal capabilities.

关键词： Router Intrusion Detection Long Short Term Memory KDD99 dataset Recurrent Neural Network

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Identification of mobile device threats based on PCA-fused neural network

Boletin Tecnico/Technical Bulletin

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Boletin Tecnico/Technical Bulletin 2017年第3期55卷 278-285页

作者： Chu, Sijun Wu, Hao Lu, Yulin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450000 China

To monitor and identify whether a mobile device is under threat or at risk effectively, in this paper, we summarize feature data from threat information of common mobile devices and set up an identification model of mobile device threats based on PCA-fused BP neural network. When extracting features from raw sample data, we consider primary vector information of all training samples. While more than 95% of the information in raw data is reserved, interference information in the data is eliminated and the robustness of the BP network model built subsequently is optimized. Finally, the trained model is tested and compared with other model algorithms. Results show that the overall identification accuracy of the proposed model algorithm reaches 91%. The identification accuracy of test samples reaches 90.4%. Compared with previous identification models, it has higher identification accuracy.

关键词： Neural networks

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Significantly Improving the Durability of Single-Chamber Solid Oxide Fuel Cells: A Highly Active CO₂-Resistant Perovskite Cathode

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ACS Applied Energy Materials 2018年第3期1卷 1337-1343页

作者： Zhang, Yuan Gao, Xuechao Sunarso, Jaka Liu, Bo Zhou, Wei Ni, Meng Shao, Zongping Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University Nanjinga 210009 China College of Chemical Engineering Nanjing Tech University Nanjing 210009 China Research Centre for Sustainable Technologies Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga Kuching Sarawak 93350 Malaysia Department of Building and Real Estate Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong 999077 Hong Kong Department of Chemical Engineering Curtin University Perth 6845 WA Australia

The single-chamber solid oxide fuel cell (SC-SOFC) represents an attractive alternative to batteries for micropower applications given its simplified stack design, easy gas management, lower operation temperature, and quicker start-up. Its stable operation over long duration relies on the availability of CO₂-resistant cathode materials with high oxygen reduction reaction (ORR) activity. Here, we reported a novel perovskite oxide cathode SrSc_0.075Ta_0.025Fe_0.9O_3-δ (SSTF75), which provides CO₂ resistance and high ORR activity. A peak power density of 1430 mW cm^-2 was achieved with the SSTF75/Sm_0.2Ce_0.8O_1.9 cathode at 650 °C with a methane and oxygen gas mixture (1:1 v/v ratio). It retained stable voltage performance at 600 °C for an over 90 h duration when discharged at a current density of 1000 mA cm^-2. This work not only represents an advancing step in the SC-SOFC field but also authenticates an effective codoping strategy for the design of a CO₂-resistant cathode for low-temperature applications. © 2018 American Chemical Society.

关键词： cathode oxygen reduction reaction perovskite single-chamber SOFC solid oxide fuel cells

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Mixed protonic-electronic conducting perovskite oxide as a robust oxygen evolution reaction catalyst

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Electrochimica Acta 2018年 282卷 324-330页

作者： Liu, Hong Yu, Jie Sunarso, Jaka Zhou, Chuan Liu, Bo Shen, Yujuan Zhou, Wei Shao, Zongping Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) No. 5 Xinmofan Road Nanjing 210009 China State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech University No. 5 Xinmofan Road Nanjing 210009 China College of Chemical Engineering Nanjing Tech University No. 5 Xinmofan Road Nanjing 210009 China Research Centre for Sustainable Technologies Faculty of Engineering Computing and Science Swinburne University of Technology Jalan Simpang Tiga Kuching 93350 Sarawak Malaysia Department of Chemical Engineering Curtin University Perth 6845 Western Australia Australia

Large-scale utilization of hydro, solar, or wind-based electrochemical water splitting relies on the availability of low cost, highly active oxygen evolution reaction (OER) catalyst. Transition metal-containing perovskite oxide is attractive in this regard. The OER on such perovskite oxide in an alkaline solution is nonetheless often limited by proton transfer step. To overcome such limitation, here we apply mixed protonic-electronic conductor BaCo_0.8-xFe_xZr_0.1Y_0.1O₃ (x = 0, 0.2, and 0.4) as an OER catalyst. Among these three, BaCo_0.8Zr_0.1Y_0.1O₃ (BC_0.8ZY) in particular shows the lowest OER overpotential, the lowest Tafel slope, the highest OER mass activity, and the highest OER specific activity, which surpass those of Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3-δ (BSCF) benchmark. Using O₂-temperature programmed desorption, impedance spectroscopy, and O1s X-ray photoelectron spectroscopy, we attribute such superior OER performance to the highest oxygen desorption capacity, the lowest charge transfer resistance, and the highest hydroxide species content for BC_0.8ZY. We also demonstrate that the OER current of BC_0.8ZY exhibits a first-reaction order dependence to the solution pH between 12.5 and 14, which confirms its proton transfer rate-determining step. © 2018 Elsevier Ltd

关键词： Electrocatalysts Electrolysis Oxygen evolution reaction Perovskite

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