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arXiv 2019年

作者： Zhou, Yuyang Cheng, Guang Jiang, Shanqing Dai, Mian School of Cyber Science and Engineering Southeast University Nanjing China Key Laboratory of Computer Network and Information Integration Ministry of Education Nanjing China Jiangsu Provincial Key Laboratory of Computer Network Technology Southeast University Nanjing China National Key Laboratory of Science and Technology on Information System Security Beijing China

Intrusion detection system (IDS) is one of extensively used techniques in a network topology to safeguard the integrity and availability of sensitive assets in the protected systems. Although many supervised and unsupervised learning approaches from the field of machine learning have been used to increase the efficacy of IDSs, it is still a problem for existing intrusion detection algorithms to achieve good performance. First, lots of redundant and irrelevant data in high-dimensional datasets interfere with the classification process of an IDS. Second, an individual classifier may not perform well in the detection of each type of attacks. Third, many models are built for stale datasets, making them less adaptable for novel attacks. Thus, we propose a new intrusion detection framework in this paper, and this framework is based on the feature selection and ensemble learning techniques. In the first step, a heuristic algorithm called CFS-BA is proposed for dimensionality reduction, which selects the optimal subset based on the correlation between features. Then, we introduce an ensemble approach that combines C4.5, Random Forest (RF), and Forest by Penalizing Attributes (Forest PA) algorithms. Finally, voting technique is used to combine the probability distributions of the base learners for attack recognition. The experimental results, using NSL-KDD, AWID, and CIC-IDS2017 datasets, reveal that the proposed CFS-BA-Ensemble method is able to exhibit better performance than other related and state of the art approaches under several metrics. Copyright © 2019, The Authors. All rights reserved.

关键词： Data mining

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Assessment Method of Offshore Wind Resource Based on Multi-dimenssiional Indexes system

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CSEE Journal of Power and Energy systems 2024年第1期10卷 76-87页

作者： Xiaomei Ma Yongqian Liu Jie Yan Shuang Han Li Li Hang Meng Muhammet Deveci Konstanze Kolle Umit Cali the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(NCEPU) School of New EnergyNorth China Electric Power UniversityBeijing 102206China School of Physical and Electronic Information Engineering Qinghai Normal UniversityXiningQinghai 810016China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(NCEPU) School of New EnergyNorth China Electric Power UniversityBeijing 102206China the Royal School of Mines Imperial College London.London SW72AZUKand also with Department of Industrial EngineeringTurkish Naval AcademyNational Defence University34940IstanbulTurkey Department of Energy Systems SINTEF Energy ResearchTrondheimNO-7034 Norway Department of Electric Power Engineering Norwegian University of Science and TechnologyTrondheimNO-7491 Norway

Traditional assessment indexes could not fully describe offshore wind resources,for the meteorological properties of offshore are more complex than *** a result,the uncertainty of offshore wind power projects would be increased and final economic benefits would be ***,a study on offshore wind resource assessment is carried out,including three processes of“studying data sources,conducting multidimensional indexes system and proposing an offshore wind resource assessment method based on analytic hierarchy process(AHP).First,measured wind data and two kinds of reanalysis data are used to analyze the characteristics and reliability of data ***,indexes such as effective wind speed occurrence,affluent level occurrence,coefficient of variation,neutral state occurrence have been proposed to depict availability,richness,and stability of offshore wind resources,*** with existing parameters(wind power density,dominant wind direction occurrence,water depth,distance to coast),a multidimensional indexes system has been built and on this basis,an offshore wind energy potential assessment method has been ***,the proposed method is verified by the annual energy production of five offshore wind turbines and practical operating data of four offshore wind farms in *** study also compares the ranking results of the AHP model to two multi-criteria decision making(MCDM)models including weighted aggregated sum product assessment(WASPAS)and multi-attribute ideal real comparative analysis(MAIRCA).Results show the proposed method gains well in practical engineering applications,where the economic score values have been considered based on the offshore reasonable utilization hours of the whole life cycle in China.

关键词： Annual energyproduction aatmospheric stability data sources offshore wind resource wind power density

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Ultrafast carrier and phonon dynamics in Bi2Se3 under high pressure

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Physical Review B 2024年第6期109卷 064307-064307页

作者： Y. Yang Y. H. Meng B. R. Lu F. Jin Y. G. Shi F. Hong S. S. Zhang X. H. Yu X. B. Wang J. L. Luo Key Laboratory of Education Ministry for Laser and Infrared System Integration Technology Shandong University Qingdao 266237 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Information Science and Engineering Shandong University Qingdao 266237 China

The nonequilibrium carrier and phonon dynamics in Bi2Se3 was studied by a combination of Raman scattering and ultrafast optical pump-probe spectroscopy at high pressures up to 31 GPa. Detailed analysis reveals that the pressure dependence of the relaxation time and the damping rate of the A1g1 phonon mode exhibit an anomaly around 3 GPa supporting the occurrence of an electronic topological transition. At higher pressure, the transient reflectivity spectra manifest discontinuous changes around 11.5, 18.9, and 28 GPa, which can be assigned to the structure transitions as evidenced by the Raman spectra. Especially, low-frequency phonon modes, corresponding to the Ag phonon modes in the monoclinic C2/m phase, were identified in both Raman and transient reflectivity spectra in the pressure range of 11.5 to 18.9 GPa. These results not only provide crucial insights into carrier-phonon interaction of Bi2Se3 under high pressure, but also pave the way for investigating the pressure-induced phase transitions from transient reflection spectroscopy.

关键词： High-pressure studies Raman spectroscopy Ultrafast femtosecond pump probe

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BAT: Mining Binary-API Topic for Multi-service Application Development

BAT: Mining Binary-API Topic for Multi-service Application D...

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International Conference on Computer Supported Cooperative Work in Design

作者： Pengfei He Linlin Liu Dianlong You Limin Shen Zhen Chen School of Information Science and Engineering Yanshan University Qinhuangdao China National Science Libraries Chinese Academy of Sciences Beijing China The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province Qinhuangdao China

With the growing popularity of API-driven multiservice application (mashup) development, the burgeoning web APIs have left developers drowning in the sea of web API selections. Matching developers with the most appropriate APIs is the key to improving user satisfaction and promoting more popular web applications. As a result, more and more researchers pay attention to web API recommender systems based on collaborative filtering. However, employing collaborative filtering to recommend APIs is challenging due to the severe sparsity of mashup and API interactions. To address this problem, we propose a probabilistic generative model, called the Binary-API Topic model (BAT), to parameterize mashups and APIs. Technically, BAT is equipped with a mechanism to extract binary-APIs and predict unknown pairwise interactions. To improve generality and capture more relevance from a limited number of interactions, we learn binary-API topics by directly modeling the generation of API co-occurrence patterns across the repository (all mashup collections from ***). The main advantage of BAT is that it preserves API co-occurrence patterns in model learning and exploits the rich global relevance. Finally, through extensive experiments, we demonstrate that BAT can achieve the highest performance on the sparse real-world data set.

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Self-powered solar-blind photodiodes based on EFG-grown(100)-dominant β-Ga_(2)O_(3) substrate

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Chinese Physics B 2021年第1期30卷 483-486页

作者： Xu-Long Chu Zeng Liu Yu-Song Zhi Yuan-Yuan Liu Shao-Hui Zhang Chao Wu Ang Gao Pei-Gang Li Dao-You Guo Zhen-Ping Wu Wei-Hua Tang Laboratory of Information Functional Materials and Devices School of Science&State Key Laboratory of Information Photonics and Optical CommunicationsBeijing University of Posts and TelecommunicationsBeijing 100876China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The Engineering Research Center for Semiconductor Integrated Technology Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China China Aerospace System Simulation Technology Co. Ltd.(Beijing)Beijing 100195China Division of Interdisciplinary and Comprehensive Research&Platform for Characterization and Test Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Center for Optoelectronics Materials and Devices&Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhou 310018China School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210046China

We report the edge-defined-film-fed(EFG)-grown β-Ga_(2)O_(3)-based Schottky *** device has a reverse leakage current of ~nA and a rectified ratio of ~10^(4) at ±5 *** addition,the photodiode detector shows a dark current of 0.3 pA,a photo-responsivity(R) of 2.875 mA/W,a special detectivity(D*) of 10^(10) Jones,and an external quantum efficiency(EQE) of 1.4% at zero bias,illustrating a self-powered *** work may advance the development of the Ga_(2)O_(3)-based Schottky diode solar-blind photodetectors.

关键词： β-Ga_(2)O_(3)substrate Schottky photodiode solar-blind detection

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Fully integrated hybrid microwave photonic receiver

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Photonics Research 2022年第6期10卷 1472-1483页

作者： JIACHEN LI SIGANG YANG HONGWEI CHEN XINGJUN WANG MINGHUA CHEN WEIWEN ZOU Beijing National Research Center for Information Science and Technology(BNRist) Department of Electronic EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Advanced Optical Communications System and Networks Department of ElectronicsSchool of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(imLic)Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Microwave photonic receivers are a promising candidate in breaking the bandwidth limitation of traditional radio-frequency(RF)*** further balance the performance superiority with the requirements regarding size,weight,and power consumption(SWa P),the implementation of integrated microwave photonic microsystems has been considered an upgrade ***,up to now,to the best of our knowledge,chip-scale fully integrated microwave photonic receivers have not been reported due to the limitation of material *** this paper,we report a fully integrated hybrid microwave photonic receiver(FIH-MWPR)obtained by comprising the indium phosphide(In P)laser chip and the monolithic silicon-on-insulator(SOI)photonic circuit into the same substrate based on the low-coupling-loss micro-optics *** from the integration of all optoelectronic components,the packaged FIH-MWPR exhibits a compact volume of 6 cmand low power consumption of 1.2 *** FIH-MWPR supports a wide operation bandwidth from 2 to 18 ***,its RF-link performance to down-convert the RF signals to the intermediate frequency is experimentally characterized by measuring the link gain,the noise figure,and the spurious-free dynamic range metrics across the whole operation frequency ***,we have utilized it as a de-chirp receiver to process the broadband linear frequencymodulated(LFM)radar echo signals at different frequency bands(S-,C-,X-,and Ku-bands)and successfully demonstrated its high-resolution-ranging *** the best of our knowledge,this is the first realization of a chip-scale broadband fully integrated microwave photonic receiver,which is expected to be an important step in demonstrating the feasibility of all-integrated microwave photonic microsystems oriented to miniaturized application scenarios.

关键词： method microwave bands

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The Design of High-temperature Permanent Magnet Synchronous Motor based on Multi-physics Simulation

The Design of High-temperature Permanent Magnet Synchronous ...

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International Conference on Power Electronics and Motion Control (IPEMC)

作者： Yu Gao Zhenyang Hao Qiang Zhou Long Wang Yuqi Jia Wenjun Cui Yuliang Lu College of Automation Nanjing University of Aeronautics and Astronautics Nanjing China The Sixty-third Research Institute National University of Defense Technology Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration AVIC Nanjing Engineering Institute of Aircraft System Nanjing China

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

The development of power electronics technology has made it possible for all-electric combat vehicle (AECV). The high-voltage power supply system, high-temperature working environment and high power density requirements of AECV bring new challenges to the design of the permanent magnet synchronous motor (PMSM). In this paper, the electromagnetic design and thermal design of PMSM for AECV are taken as the research object. A high-speed PMSM with rated power of 1.5kW and rated speed of 18000r/min is designed. In order to accurately calculate the losses in the PMSM under the space vector pulse width modulation (SVPWM) voltage, this paper uses a multi-physics simulation method. Finally, electromagnetic simulation and thermal simulation of the motor are carried out. The results show that the motor meets the design requirements.

关键词： Space vector pulse width modulation Power system measurements Power supplies Permanent magnet motors Synchronous motors Power electronics Electromagnetics

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Reliability and real-time assurance of fly-by-light network for flight control system

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Guangxue Xuebao/Acta Optica Sinica 2008年第SUPPL. 2期28卷 196-200页

作者： Luo, Jiarong Luo, Xuan He, Hao Jin, Yaohui Huang, Haoyi Wu, Jianmin State Key Laboratory on Fiber-Optic Local Area Network and Advanced Optical Communication Systems Shanghai Jiaotong University Shanghai 200240 China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology Shanghai 200233 China

A survey is made on several traditional topologies of fly-by-light(FBL) network. Based on the comparison of their reliability and real-time performance, a mesh optical switching network topology with 256 nodes is chosen. The redundancy topology gives the ability to sustain 3 link faults, which assures the reliability of network. The seriousness of the network failure can be measured by the number of link faults. And when several link faults occur at the same time, it must also be measured by the contiguity degree among the faults. A simulation is taken to test the end-to-end latency under all network failure situations. The simulation results show that even when some serious fault occurs, the number of hops of the end-to-end route increases slightly. So it still meets the real-time communication requirements.

关键词： Flight control systems

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Multi-parameter prediction model of the aeroengine based on chaos particle swarm optimization

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Hangkong Taikong ji Minhang Xuekan/Journal of Aeronautics, Astronautics and Aviation, Series B 2012年第1期44卷 43-48页

作者： Niu, Wei Cheng, Juan Wang, Guo-Ging Zhai, Zheng-Jun College of Computer Northwestern Polytechnical University Xi'an 710072 China Xi'an Institute of Applied Optics Xi'an 710065 China National Key Laboratory of Science and Technology on Avionics System Integration Shanghai 200233 China

The fault prediction of weapon is getting more difficult for its complex structure, unique operating environment and multi-plicate faults. Currently although the main fault prediction methods have achieved certain success in practical application, they all fall short in some aspects. In grey forecasting model, the theoretical basis of transformation from discrete form to continuous form and the forecasting stability, which puzzled those who are absorbed in grey theory. Many scholars used all kinds of methods to revise the model, and they have made some progress, but they didn't solve it absolutely in principle. Based on the discrete grey prediction theory and with an analysis of the disadvantages of the discrete grey model, an adaptive prediction model with several characteristic parameters for small samples is proposed. This model reconstructs the initial value based on chaos particle swarm optimization and takes into account the interrelations of the parameters and characteristics of prediction series. The data of a certain aeroengine are taken as an example for prediction and analysis, and the results showed that the model had high availability and precision.

关键词： Forecasting

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Maximally steerable mixed state based on the linear steering inequality and the Clauser-Horne-Shimony-Holt–like steering inequality

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Physical Review A 2018年第3期97卷 032119-032119页

作者： Changliang Ren Hong-Yi Su Haofei Shi Jingling Chen Center for Nanofabrication and System Integration Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences 400714 People's Republic of China Chongqing Key Laboratory of Multi-Scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences 400714 People's Republic of China CAS Key Laboratory of Quantum Information University of Science and Technology of China Hefei 230026 People's Republic of China Theoretical Physics Division Chern Institute of Mathematics Nankai University Tianjin 300071 People's Republic of China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543

The two-qubit maximally steerable mixed state (MSMS), defined as one that violates to the most degree a steering inequality for any fixed linear entropy, is derived mathematically here based on the two-setting (three-setting) linear steering inequality and the two-setting Clauser-Horne-Shimony-Holt–like steering inequality. Interestingly, the form of the MSMS based on such different steering inequalities obtained here is identical to the two-qubit maximally nonlocal mixed state (MNMS). It is clearly shown that finding any two-qubit state, of which the state mixedness exceeds 2/3, thus violating the three-setting steering inequalities, is impossible. The violation of the inequalities with the Werner state and with the maximally entangled mixed state, respectively, as well as the relations between their optimal violation and the linear entropy, is also discussed comprehensively. In particular, within the range ɛ(ρ)∈[0,2/3] of the fixed linear entropy, the Werner state reaches the same violation as the MSMS does of the three-setting linear steering inequality, but not of the two-setting steering inequalities (for the latter inequalities the violation with the Werner state is generally less than that with the MSMS). For the MEMS, the optimal violation is always lower than that of the MSMS for any fixed linear entropy.

关键词： Nonlocality Quantum entanglement Resource theories

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