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18th Asia Joint Conference on Information Security, AsiaJCIS 2023

作者： Myung, Joonwoo Ko, Youngmin Kwon, Taewoong Lee, Jun Kim, Kyuil Song, Jungsuk Korea Institute of Science and Technology Information Science and Technology Security R&d Center Daejeon Korea Republic of

ISBN: (纸本)9798350341638

With the development of computer networks, the amount of network traffic is explosively increasing. In addition, the importance of cyber security is being highlighted as cyber threats increase accordingly. In general, rule-based detection approaches have been used to detect cyber threats. The detection rules used in these are broadly set up to reliably detect cyber threats, resulting in too many unnecessary events. This leads to unanalyzed events, which can lead to severe security incidents. To solve this problem, recently, researches on AI-based cyber threat detection system that learns network traffic information and automatically generates detection rules are being conducted. Most of them have used complex model with sophisticated structures or feature engineering techniques so that AI models can learn as much information as possible. But, these are difficult to use in real-world security monitoring environment where quick decisions need to be made in real time, and are not suitable for that environments because they have been trained and verified through only open datasets. In this paper, we propose an AI-based cyber threat detection system that efficiently learns security event characteristics without any complicated process using tree-based model which efficient to learning tabular data. The proposed system detects cyber threats by learning security event characteristics using only information provided from security devices without complicated feature extraction process. In addition, rather than using the used information as a simple value, the value is transformed through a simple process so that the model can learn the event characteristics more effectively. Using the simplicity of the proposed method, it is expected that it can be applied to the real-world environments, and the possibility of this is demonstrated through real-world data. © 2023 IEEE.

关键词： Network security

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Polyethylene Oxide-Based Composite Solid Electrolytes for Lithium Batteries:Current Progress,Low-Temperature and High-Voltage Limitations,and Prospects

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Electrochemical Energy reviews 2024年第1期7卷 53-90页

作者： Xin Su Xiao-Pei Xu Zhao-Qi Ji Ji Wu Fei Ma Li-Zhen Fan Advanced Battery Technology Center School of New EnergyHarbin Institute of TechnologyWeihai 264209ShandongChina Advanced Battery Technology Center School of Marine Science and TechnologyHarbin Institute of TechnologyWeihai 264209ShandongChina Advanced Battery Technology Center School of Automotive EngineeringHarbin Institute of TechnologyWeihai 264209ShandongChina R&D Center Shanghai Shanshan Technology Co.Ltd.Shanghai 201209China Department of Chemistry and Biochemistry Georgia Southern UniversityStatesboro GA30460USA Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

Lithium-ion batteries(LIBs)are considered to be one of the most promising power sources for mobile electronic products,portable power devices and vehicles due to their superior environmental friendliness,excellent energy density,negligible memory effect,good charge/discharge rates,stable cycling life,and efficient electrochemical energy conversion,which distinguish it from other power ***,the flammable and volatile organic solvents in carbonate-containing liquid electrolytes can leach,resulting in thermal runaway and interface reactions,thus significantly limiting its *** use of polymer solid electrolytes is an effective way to solve this safety issues,among which poly(ethylene oxide)(PEO)-based solid polymer electrolytes(SPEs)have attracted much attention because of their stable mechanical properties,ease of fabrication,excellent electrochemical and thermal ***,PEO-SPEs with their low room-temperature ionic conductivity,narrow electrochemical windows,poor interface stability,and uncontrollable growth of lithium dendrites cannot meet the demand for high energy density in future ***,this review firstly describes the ion transport mechanisms and challenges that are crucial for PEO-SPEs,and then provides a comprehensive review of current approaches to address the challenges,including novel and efficient lithium salts,additives,composite electrolytes,stable solid electrolyte interfaces,3-d lithium metals and alloys,cathode protection layers and multi-layer ***,future research directions are proposed for the stable operation of PEO-SPEs at room temperature and high voltage,which is imperative for the commercialization of safe and high energy density LIBs.

关键词： Solid polymer electrolytes Polyethylene oxide Ionic conductivity Electrochemical window Lithium-ions batteries Additives

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Construction of the proprietary model of metro intelligent customer service based on open source large language model 4

Construction of the proprietary model of metro intelligent c...

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2024 4th International Conference on Intelligent Traffic Systems and Smart City, ITSSC 2024

作者： Lin, Tianzhen Liu, Hengyu Wang, Cui Yang, Huimin R&D Center Qingdao Bonin Fortune Intelligent Transportation Technology Development Co. Ltd. Qingdao266111 China

ISBN: (纸本)9781510686304

The growth of passenger flow in Qingdao Metro has led to the rise of customer service demand. The existing customer service system is constructed based on NLP and knowledge graph, which has the problems of inaccurate understanding of questions, low correlation of answers, and low passenger satisfaction. With the development of large language model technology, customized large language models combined with domain-specific knowledge are increasingly applied to practical application scenarios. After comparing the mainstream open-source large language models, this paper selects Qwen2-7B model as the base model, combines the special knowledge of Qingdao Metro customer service field, generates the Qingdao Metro special customer service model through pre-training and fine-tuning, and develops the Qingdao Metro intelligent customer service agent by means of retrieval-augmented generation and prompt engineering. The evaluation test shows that the score of the model reaches 87 points, which is greater than the 80 points of the Qwen2-7B general model and the 45 points of the existing customer service system. Compared with the original customer service system of Qingdao Metro, the answer accuracy of the model is increased by 38%, and the answer accuracy is increased by 16% compared with the general model. The proprietary large language model of metro intelligent customer service based on open source large language model can effectively solve passenger problems and improve passenger satisfaction. © 2025 SPIE.

关键词： Sales

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Study on Coupled Vibration-Impact Modeling of Vehicle Mounting and driveline System

Study on Coupled Vibration-Impact Modeling of Vehicle Mounti...

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2023中国汽车工程学会年会暨展览会

作者： Zhang Zhijun Yang Xianwu Zhao Jie Zhao Qin Tang Yu Zhang Chunbo State Key Laboratory of Vehicle NVH and Safety Technology Changan Auto R&D Center

ISBN: (纸本)9789819702510

Torsional vibration of the vehicle driveline system interacts with the pitch motion of the *** paper presents the establishments of a coupled vibration model of mounting and driveline *** coupled model is utilized to analyze a transient issue that oscillation occurs to both the mounting and driveline of a vehicle during the rapid disengagement of the *** comparison to independent models,the modal frequency calculated by coupled model is more consistent with the experimental *** coupled model also demonstrates high accuracy in time domain *** paper conducts parameters sensitivity analysis,and it is confirmed that the torsional damping of the half shaft is the primacy parameter responsible for attenuating system *** coupled model can be extended to analyze low-frequency coupled vibration of mounting and driveline in other situations.

关键词： coupled vibration driveline system impact mounting system

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Effect of Fine Metal Compounds on Hydrogen Embrittlement resistance 28

Effect of Fine Metal Compounds on Hydrogen Embrittlement Res...

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28th Congress of the International Federation for Heat Treatment and Surface Engineering, IFHTSE 2023

作者： Sato, Miyu Yamada, Masahiro Ohki, Chikara Advanced Technology R&D Center NTN Corporation Mie Kuwana511-0867 Japan

ISBN: (纸本)9781713889533

We recently developed a bearing steel and a hardening process, in which a large number of fine metal compounds are generated and dispersed on the surface layer of the rolling bearing raceway, to prevent premature failure due to hydrogen embrittlement. In this study, to evaluate hydrogen embrittlement resistance, a rolling contact fatigue test is carried out under various operating conditions. In addition, wear resistance is evaluated and the effect of the fine metal compounds on hydrogen embrittlement resistance is discussed. © 2023 28th IFHTSE 2023 Congress. All rights reserved.

关键词： roller bearings

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design method of FMEA-based operating system robust testing case design method

Design method of FMEA-based operating system robust testing ...

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2024 International Conference on Algorithms, High Performance Computing, and Artificial Intelligence, AHPCAI 2024

作者： Yang, Chenghao Yue, Xiaoguo Wang, Zhi Fang, Yuan Cui, Can Zhu, Xinjie The 15th Research Institute China Electronics Technology Group Corporation Platform R&D Center Beijing China

ISBN: (纸本)9781510685840

Aiming at the problems of frequent occurrence of domestic operating system robustness problems, insufficient test coverage and low defect detection rate at this stage, we carry out the research on operating system robustness testing and propose a method of constructing operating system robustness test cases based on FMEA (Failure Mode and Effect Analysis) technology, which applies the FMEA technology to software robustness testing. In this paper, we design FMEA analysis guidelines using the requirements of relevant standards in the testing field, and guide testers to analyze the potential failure modes in the relevant documents of the operating system according to the guidelines, and carry out the failure mode and impact analysis to further construct the set of robustness test cases. Finally, through experimental verification, this method gives full play to the advantages of FMEA in the field of robustness testing, and the number of defects found has been greatly improved, which effectively improves the quality of the robustness test cases and further improves the robustness of the domestic operating system, and it has strong engineering application value. © 2024 SPIE.

关键词： Failure modes

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Impact of Fracture Network Connectivity on the Ultimate recovery from Shale Gas Wells

Impact of Fracture Network Connectivity on the Ultimate Reco...

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2024 International Petroleum technology Conference, IPTC 2024

作者： Haider, S. Patzek, Tadeusz Sinopec Tech Middle East R&D Center Saudi Arabia King Abdullah University of Science and Technology Saudi Arabia

ISBN: (纸本)9781959025184

The production decline of an unconventional gas well depends on the induced fracture network and its complexity that depends on the stimulation parameters. In this study, we investigate the effect of stimulation job size on the distribution of the induced fracture network. Further, we investigate the effect of fracture network complexity on the production rate decline and recovery factor of shale gas wells The complexity of the induced fracture network after hydrofracturing depends on (a) the permeability of the induced fracture network, kf, in the stimulated reservoir volume (SrV) and (b) the fractal dimension, d, of the induced fracture network. We have simulated 3000 wells from Barnett and used the kf - s - d fractal-SrV model to estimate kf and d of a well under production. The relation between kf and d, and its effect on the fracture network distribution was analyzed. Finally, the relation between induced fracture complexity was correlated with the onset of exponential production decline. We found an exponential relation between kf and d for Barnett. The values of kf and d control fracture distribution in the SrV, and the decay of fracture permeability away from the hydrofracture face. The results show that, as the stimulation job size increases, the induced fracture permeability, kf, increases and vice-versa. However, this high kf signature decays faster away from the hydrofracture face because of the higher value of d. Also, as the d of the induced fracture network increases, the onset of exponential production decline comes faster. Finally, we conclude that (a) fracture network is spread over a larger SrV volume for smaller stimulation jobs, (b) induced fracture permeability, kf, in the SrV is relatively homogeneous for smaller stimulation jobs compared to the large ones, and (c) large-size stimulation job does not serve the economic and production objectives in the long run. Our study uses production data to extract induced fracture network parameters after

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Low False-Alarm Active Sonar detection under Strong reverberation

Low False-Alarm Active Sonar Detection under Strong Reverber...

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2024 OES China Ocean Acoustics, COA 2024

作者： Sibo, Li rui, Guo dianlun, Zhang Yujuan, Li Xiaoqian, Hou Shengfeng, Wang Science and Technology on Underwater Acoustic Laboratory/ Technology R&d Center Harbin Engineering University Haiying Enterprise Group Co. Ltd Wuxi Harbin China Technology R&d Center Haiying Enterprise Group Co. Ltd Wuxi China Science and Technology on Underwater Acoustic Laboratory Harbin Engineering University Harbin China

ISBN: (纸本)9798350340297

In active low-frequency and high-power sonar systems, target detection must overcome strong reverberation. Active sonar reverberation interference strongly fluctuates with distance and exhibits significant temporal and spatial variations. Active sonar reverberation is a typical nonstationary background. Complex changes in reverberation directly affect the target detection performance of active sonar systems. The major difficulty associated with current detection algorithms lies in autonomous detection, particularly in terms of the adaptability of detection algorithms to complex background interference. Accurately performing dynamic background estimation, suppressing interference, controlling false alarms, and highlighting weak targets are the focus of object detection. This paper proposes an active sonar target detection method driven by a combination of data and models. The proposed method can achieve target detection under strong reverberation interference with low sidelobe false alarms and high robustness. © 2024 IEEE.

关键词： reverberation

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Fringes and Light Shift in CPT-ramsey Spectroscopy 9

Fringes and Light Shift in CPT-Ramsey Spectroscopy

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Morinaga, Atsuo Yanagimachi, Shinya R&D Promotion Division Micromachine Center Tsukuba Japan National Institute of Advanced Industrial Science and Technology Tsukuba Japan

The CPT-ramsey fringes are solved based on the time evolution of the Bloch vector and are calculated in the steady-state condition and in the pre-steady state condition. A consistent formula of the light shifts in the CPT-ramsey fringes is presented due to the detection-time, the free evolution time, and the excitation-time. For a further reduction of the light shift, we propose to use the CPT-ramsey fringes in the pre-steady state condition. © Published under licence by IOP Publishing Ltd.

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Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

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Chinese Journal of Chemical Engineering 2023年第5期57卷 193-201页

作者： Yongbo Liu Zhihao Si Cong ren Hanzhu Wu Peng Zhan Yuqing Peng Peiyong Qin National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China College of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Membrane Science and Technology College of ChemicalEngineeringBeijing University of Chemical TechnologyBeijing 100029China

Separation membrane with high flux is generally encouraged in industrial application,because of the tremendous needs for decreasing membrane areas,usage costs and space *** most effective and direct method for obtaining the high flux is to decrease membrane ***(PA)nanofiltration membrane is conventionally prepared by the direct interfacial polymerization(IP)on substrate surface,and results in a thick PA *** this work,we proposed a strategy that constructing triazine-based porous organic polymer(TrZ-POP)as the interlayer to prepare the ultrathin PA nanofiltration ***-POP is firstly deposited on the polyethersulfone substrate,and then the formed TrZ-POP provides more adhesion sites towards PA based on its high specific surface *** chemical bonding between terminal amine group of TrZ-POP and the amide group of PA further improves the binding force,and strengthens the stability of PA *** importantly,the high porosity of TrZPOP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer;and H-bonding interaction between amine groups of TrZ-POP and piperazine(PIP)can astrict the release of ***,IP process is controlled,and the thinnest thickness of prepared PA layer is only<15 *** expected,PA/TrZ-POP membrane shows a more excellent water flux of 1414 L·m^(-2)·h^(-1)·MPa^(-1)than that of the state-of-the-art nanofiltration membranes,and without sacrificing dye *** build of TrZPOP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

关键词： Polyamide Nanofiltration Interfacial polymerization Triazine-based porous organic polymer

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