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Towards the manipulation of topological states of matter： a perspective from electron transport

Science Bulletin 2018年第9期63卷 580-594页

作者： Cheng Zhang Hai-Zhou Lu Shun-Qing Shen Yong P. Chen Faxian Xi State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China Institute for Quantum Science and Engineering and Department of Physics South University of Science and Technology of China Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China Department of Physics The University of Hong Kong. Hong Kong China Department of Physics and Astronomy Purdue University West Lafayette 47907 USA Birck Nanotechnology Center Purdue University West Lafayette 47907 USA School of Electrical and Computer Engineering Purdue University West Lafayette 47907 USA Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China

The introduction of topological invariants, ranging from insulators to metals, has provided new insights into the traditional classification of electronic states in condensed matter physics. A sudden change in the topological invariant at the boundaw of a topological nontrivial system leads to the formation of exotic surface states that are dramatically different from its bulk. In recent years, significant advancements in the exploration of the physical properties of these topological systems and regarding device research related to spintronics and quantum computation have been made. Here, we review the progress of the characterization and manipulation of topological phases from the electron transport perspective and also the intriguing chiral/Majorana states that stem from them. We then discuss the future directions of research into these topological states and their potential applications.

关键词： Topological insulator Dirac semimetal Weyl semimetal Quantum transport

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Photoinduced Radical Emission in a Coassembly System

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Angewandte Chemie 2021年第44期133卷

作者： Yiran Li Dr. Glib V. Baryshnikov Chenggang Xu Prof. Hans Ågren Prof. Liangliang Zhu Prof. Tao Yi Prof. Yanli Zhao Prof. Hongwei Wu State Key Laboratory for Modification of Chemical Fiber and Polymer Materials National Manufacturing Innovation Center of Advanced Dyeing and Finishing Technology College of Chemistry Chemical Engineering and Biotechnology Donghua University Shanghai 201620 P. R. China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 China Laboratory of Organic Electronics Department of Science and Technology Linköping University 60174 Norrköping Sweden Department of Physics and Astronomy Uppsala University Box 516 75120 Uppsala Sweden Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore

Developing radical emission at ambient conditions is a challenging task since radical species are unstable in air. In the present work, we overcome this challenge by coassembling a series of tricarbonyl-substituted benzene molecules with polyvinyl alcohol (PVA). The strong hydrogen bonds between the guest dopants and the PVA host matrix protect the free radicals of carbonyl compounds after light irradiation, leading to strong solid state free radical emission. Changing temperature and peripheral functional groups of the tricarbonyl-substituted benzenes can influence the intensity of the radical emission. Quantum-chemical calculations predict that such free radical fluorescence originates from anti-Kasha D 2 →D 0 vertical emission by the anion radicals. The photoinduced radical emission by the tricarbonyl-substituted benzenes was successfully utilized for information encryption application.

关键词： anti-counterfeiting coassembly light emission photoirradiation radical luminescence

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IP geolocation base on local delay distribution similarity 9th

IP geolocation base on local delay distribution similarity

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9th International Symposium on Cyberspace Safety and Security, CSS 2017

作者： Zhao, Fan Luo, Xiangyang Gan, Yong Zu, Shuodi Liu, Fenlin State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China School of Computer and Communication Engineering Zhengzhou University of Light Industry Zhengzhou450001 China

ISBN: (纸本)9783319694702

IP geolocation technology can be used to obtain the real-time locations of target Internet hosts especially mobile computers, which can help law enforcement to quickly get the criminal evidence or arrest criminals. Among existing numerous geolocation methods, SLG (Street-Level Geolocation) method can achieve geolocation result with relative higher precision for a target host. However, the geolocation accuracy will be significantly reduced once the common routers that play an important role in geolocation are anonymous, which often happens in paths detection. To solve this problem, this paper proposes an IP geolocation algorithm base on local delay distribution similarity. Firstly, the target’s location at city-level granularity is obtained based on traditional SLG method. Secondly, the landmarks connected with the target by common routers are found out by topology analysis. The target’s local delay between the nearest common router and the target is gained by multi-measurement and calculation, so do the landmarks’. Thirdly, their local delay distribution is obtained by statistical analysis. Lastly, the landmark whose local delay distribution is the most similar with the target’s is selected as the estimated location of the target. Experimental results show that the proposed algorithm obviously improves the geolocation accuracy compared with traditional SLG when the common routers are anonymous. © 2017, Springer International Publishing AG.

关键词： Routers

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Numerical simulation of liquid sloshing with multiple flexible baffles using a coupled SPH with smoothed point interpolation method 28

Numerical simulation of liquid sloshing with multiple flexib...

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28th International Ocean and Polar engineering Conference, ISOPE 2018

作者： Wang, Shuangqiang Zhang, Guiyong Yan, Boqian Zhang, Zhiqian Zong, Zhi School of Naval Architecture Engineering Dalian University of Technology Liaoning Engineering Laboratory for Deep-Sea Floating Structures Dalian China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai China Institute of High Performance Computing A*STAR Singapore

ISBN: (纸本)9781880653876

A novel method of coupled SPH with smoothed point interpolation method (S-PIM) has been employed to simulate the 2-D problem of liquid sloshing with multiple flexible baffles. In this simulation, the exciting force enforces a rectangular tank to move in a horizontal direction periodically. And multiple baffles with different defamations and location arrangements have been investigated to present the complex mechanism of sloshing mitigation. Copyright © 2018 by the International Society of Offshore and Polar Engineers (ISOPE)

关键词： Interpolation

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Enhancing Traffic Performance of Scale-free Networks by Employing Hybrid-information-based Queuing Strategy

Enhancing Traffic Performance of Scale-free Networks by Empl...

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2018 International Conference on Mechanical,Electrical,Electronic engineering & Science(MEEES 2018)

作者： Yulin Lu Fenlin Liu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Science and Technology Institute

ISBN: (纸本)9781510868755

Traffic congestion problem has become a bottleneck restricting the development of modern transportation systems, and accordingly the networked traffic system has drawn lots of researcher's attention. To enhance transportation efficiency on scale-free networks, we proposed a hybridinformation-based(HIB) queuing strategy, where one packet's priority is related to its available transmission resource in the surplus path and current distance to destination. Numerical results show that the HIB queuing strategy perform much better than the traditional first-in-first-out(FIFO) queuing strategy in the congestion state, and the average travelling time, the rate of waiting time to travelling time Pwt and the packet arrived rate which can reflect transportation efficiency are improved remarkably. Our work should be valuable and helpful for research on networked traffic systems.

关键词： Scale-free network queuing strategy networked traffic system

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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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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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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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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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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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