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

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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An Embedded FPGA Operating System Optimized for Vision computing (Abstract Only) 15

An Embedded FPGA Operating System Optimized for Vision Compu...

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Proceedings of the 2015 ACM/SIGDA International Symposium on Field-Programmable Gate Arrays

作者： Zhilei Chai Jin Yu Zhibin Wang Jie Zhang Haojie Zhou Jiangnan University Wuxi China State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China

ISBN: (纸本)9781450333153

Although FPGA's power and performance advantages were recognized widely, designing applications on FPGA-based systems is traditionally a task undertaken by hardware experts. It is significant to allow application-level programmers with less system-level but more algorithm knowledge to realize their applications conveniently on FPGAs. In this paper, an embedded FPGA operating system is proposed to facilitate application-level programmers to use FPGAs. Firstly, it builds specific I/Os and optimizes bus interconnection among I/Os, DDR memory, user IPs etc within the FPGA for vision computing. Secondly, it manages resources of the FPGA such as I/Os, DDR memory, communication etc, frees users from low-level details. Thirdly, it schedules tasks (IPs) executed on the FPGA dynamically in runtime, which makes the FPGA multiplexed when necessary. After porting the FPGA operating system to different FPGA platforms and implementing vision algorithms based on that, it shows the FPGA operating system is able to simplify algorithm development on FPGA platforms and improve portability of user applications. Furthermore, implementation results of several popular vision algorithms show the FPGA operating system is efficient and effective for vision computing. Finally, experimental results shows that for multiple algorithms requiring more FPGA resources, runtime task scheduling of multiple IPs is more efficient than a fixed IP when the SoC of FPGA is considered.

关键词： vision computing operating systems portability of applications application programmers fpgas

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Practical attacks on decoy-state quantum-key-distribution systems with detector efficiency mismatch

Practical attacks on decoy-state quantum-key-distribution sy...

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中国密码学会2015年量子密码专业委员会学术会议

作者： Yangyang Fei Ming Gao Weilong Wang Chaobo Li Zhi Ma Key Laboratory of Mathematical Engineering and Advanced Computing ZhengzhouHenan450001China

To the active-basis-choice decoy-state quantum-key-distribution systems with detector efficiency mismatch,we present a modified attack strategy,which is based on the faked states attack,with quantum nondemolitionmeasurement ability to restress the threat of detector efficiency *** that perfect quantumnondemolition measurement ability doesn't exist in real life,we also propose a practical attack strategy usingphoton number resolving detectors.

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Ameba: A High-Performance and Energy-Efficient Online Video Retrieval System

Ameba: A High-Performance and Energy-Efficient Online Video ...

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IEEE International Conference on Multimedia Big Data (BigMM)

作者： Jin Yang Jianmin Pang Jintao Yu Wei Cao State Key Laboratory of Mathematical Engineering Advanced Computing Zhengzhou China State Key Laboratory of ASIC System Fudan University Shanghai China

ISBN: (纸本)9781479986897

This paper describes a high-performance and energy-efficient online video retrieval system called Ameba. Ameba contains a number of custom reconfigurable nodes which are grouped by a novel architecture. The system aims to address the performance and energy efficiency issues for large scale dynamic concurrent query requests. The open SURF approach and a Hamming distance based matching algorithm were implemented and improved on FPGA to increase the performance and energy efficiency. A predictive algorithm is proposed to forecast the trends of online query requests. This scalability which is obtained from the dynamic reconfiguration, makes the system have ability to improve its energy efficiency with the guarantee of performance. The simulation experiments are conducted with a considerable library which consists of 4650 videos with a combined length of more than 3000 hours. The comparative results demonstrate that Ameba has performance and energy efficiency advantages when facing large scale online video retrieval requests.

关键词： Field programmable gate arrays Energy efficiency Prediction algorithms Servers Computer architecture Streaming media Feature extraction

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Carrier-depletion Mach-Zehnder silicon optical modulator for high-speed and multi-level applications

Carrier-depletion Mach-Zehnder silicon optical modulator for...

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IEEE International Conference on Group IV Photonics

作者： Jianfeng Ding Lin Yang Lei Zhang Ping Zhou State Key Laboratory of Mathematical Engineering and Advanced Computing Wuxi China State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Beijing China

We demonstrate a 64-Gbps carrier-depletion modulator which also can be used to generate the PAM-4 optical signal. This proves that the silicon optical modulator is suitable for different kinds of applications.

ISBN: (纸本)9781479982561

关键词： Optical device fabrication Nonlinear optics Optical modulation High-speed optical techniques Silicon

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Security analysis and improvement of two attribute-based signature schemes

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Tongxin Xuebao/Journal on Communications 2016年 37卷 168-173页

作者： Yang, Xiao Xiang, Guang-Li Wei, Jiang-Hong Sun, Rui-Zong School of Computer Science and Technology Wuhan University of Technology Wuhan430070 China PLA Information Engineering University Zhengzhou450001 China Stake Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450001 China

In order to overcome the drawbacks of current attribute-based signature (ABS) schemes in terms of security, efficiency and signing policy, Ma, et al. and Cao, et al. respectively proposed a threshold ABS with single attribute authority and a multi-authority ABS with signing policy supporting AND, OR, threshold gates, and presented the security proof of their schemes under computational Diffie-Hellman assumption. Both schemes were demonstrated have security pitfalls by presenting specified attacks against them. Specifically, their schemes are all vulnerable to forgery attack. Thus, they are not feasible for practical applications. In addition, the cause of the flaws in these ABS schemes are presented, as well as an improvement of Ma et al.'s scheme. © 2016, Editorial Board of Journal on Communications. All right reserved.

关键词： Security systems

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Quantum state Tomography via Reduced Density Matrices

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Physical Review Letters 2017年第2期118卷 020401-020401页

作者： Tao Xin Dawei Lu Joel Klassen Nengkun Yu Zhengfeng Ji Jianxin Chen Xian Ma Guilu Long Bei Zeng Raymond Laflamme State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua University Beijing 100084 China Institute for Quantum Computing University of Waterloo Waterloo Ontario N2L 3G1 Canada Department of Physics University of Guelph Guelph N1G 2W1 Ontario Canada Centre for Quantum Computation and Intelligent Systems Faculty of Engineering and Information Technology University of Technology Sydney New South Wales 2007 Australia Department of Mathematics and Statistics University of Guelph Guelph N1G 2W1 Ontario Canada State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences 100190 Beijing China Joint Center for Quantum Information and Computer Science University of Maryland College Park Maryland USA Department of Physics and Astronomy University of Waterloo Waterloo Ontario N2L 3G1 Canada Canadian Institute for Advanced Research Toronto M5G 1Z8 Ontario Canada Perimeter Institute for Theoretical Physics Waterloo Ontario N2L 2Y5 Canada

Quantum state tomography via local measurements is an efficient tool for characterizing quantum states. However, it requires that the original global state be uniquely determined (UD) by its local reduced density matrices (RDMs). In this work, we demonstrate for the first time a class of states that are UD by their RDMs under the assumption that the global state is pure, but fail to be UD in the absence of that assumption. This discovery allows us to classify quantum states according to their UD properties, with the requirement that each class be treated distinctly in the practice of simplifying quantum state tomography. Additionally, we experimentally test the feasibility and stability of performing quantum state tomography via the measurement of local RDMs for each class. These theoretical and experimental results demonstrate the advantages and possible pitfalls of quantum state tomography with local measurements.

关键词： Quantum entanglement Quantum information processing Quantum tomography Random matrix theory

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