检索结果-南通市图书馆

Cybersecurity Landscape on Remote State Estimation:A Comprehensive Review

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 851-865页

作者： Jing zhou Jun Shang Tongwen Chen the Department of Electrical and Computer Engineering University of AlbertaEdmonton AB T6G 1H9Canada the Department of Control Science and Engineering and Shanghai Research Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China

Cyber-physical systems(CPSs)have emerged as an essential area of research in the last decade,providing a new paradigm for the integration of computational and physical units in modern control *** state estimation(RSE)is an indispensable functional module of ***,it has been demonstrated that malicious agents can manipulate data packets transmitted through unreliable channels of RSE,leading to severe estimation performance *** paper aims to present an overview of recent advances in cyber-attacks and defensive countermeasures,with a specific focus on integrity attacks against ***,two representative frameworks for the synthesis of optimal deception attacks with various performance metrics and stealthiness constraints are discussed,which provide a deeper insight into the vulnerabilities of ***,a detailed review of typical attack detection and resilient estimation algorithms is included,illustrating the latest defensive measures safeguarding RSE from ***,some prevalent attacks impairing the confidentiality and data availability of RSE are examined from both attackers'and defenders'***,several challenges and open problems are presented to inspire further exploration and future research in this field.

关键词： Cyber-attacks Kalman filtering remote state estimation unreliable transmission channels

Design of an efficient collector for the HIAF electron cooling system

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第10期32卷 39-49页

作者： Mei-Tang Tang Li-Jun Mao Hai-Jiao Lu Li-Xia Zhao Jie Li Xiao-Ping Sha Fu Ma yun-Bin zhou Kai-Min Yan Xiao-Ming Ma Xiao-Dong Yang Jian-Cheng Yang Institute of Modern Physics Chinese Academy of ScienceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

A collector with high perveance,efficient recu-peration,and low secondary emissions is required for the 450-keV electron cooler in the HIAF accelerator *** optimize the collection efficiency of the collector,a simulation program,based on the Monte Carlo simulations,was developed in the world’s first attempt to calculate the electron collection *** this program,the backscattering electrons and secondary electrons generated on the collector surface are calculated using a Monte Carlo approach,and all electron trajectories in the collector region are tracked by the Runge–Kutta *** this paper,the features and structure of our program are *** backscattering electron yields,with various collector surface materials,are calculated using our ***,the collector efficiencies for various col-lector structures and electromagnetic fields are simulated and *** measurement results of the collection efficiency of the HIAF collector prototype and the CSRm synchrotron are also *** experimental results were in good agreement with the simulation results of our program.

关键词： Electron cooler Secondary electron Backscattering electron Monte Carlo method Dielectric function

Rail Detection Based on LSD and the Least Square Curve Fitting

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2021年第1期18卷 85-95页

作者： yun-Shui Zheng Yan-Wei Jin Yu Dong College of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Automation Research Institute Lanzhou Jiaotong UniversityLanzhou 730070China

It is necessary to rely on the rail gauge to determine whether the object beside the track will affect train operation safety or not.A convenient and fast method based on line segment detector(LSD)and the least square curve fitting to identify the rail in the image is proposed in this *** image in front of the train can be obtained through the camera *** preprocessing,it will be divided equally along the longitudinal *** the characteristics of the LSD algorithm,the edges are approximated into multiple line *** screening the terminals of the line segments,it can generate the mathematical model of the rail in the image based on the least *** show that the algorithm in this paper can fit the rail curve accurately and has good applicability and robustness.

关键词： Rail inspection line segment detector(LSD)algorithm the least square curve fitting foreign object detection

High cholesterol intake remodels cholesterol turnover and energy homeostasis in Nile tilapia(Oreochromis niloticus)

在线全文

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2023年第1期5卷 56-74页

作者： Rui-Xin Li Ling-yun Chen Samwel M.Limbu Yu-Cheng Qian Wen-Hao zhou Li-Qiao Chen Yuan Luo Fang Qiao Mei-Ling Zhang Zhen-Yu Du LANEH School of Life SciencesEast China Normal UniversityShanghai200241China Department of Aquaculture Technology School of Aquatic Sciences and Fisheries TechnologyUniversity of Dar es SalaamP.O.Box 60091Dar es SalaamTanzania

The roles of dietary cholesterol in fish physiology are currently *** issue reflects the limited studies on the metabolic consequences of cholesterol intake in *** present study investigated the metabolic responses to high cholesterol intake in Nile tilapia(Oreochromis niloticus),which were fed with four cholesterol-contained diets(0.8,1.6,2.4 and 3.2%)and a control diet for eight *** fish-fed cholesterol diets showed increased body weight,but accumulated cholesterol(the peak level was in the 1.6%cholesterol group).Then,we selected 1.6%cholesterol and control diets for further *** high cholesterol diet impaired liver function and reduced mitochondria number in ***,high cholesterol intake triggered protective adaptation via(1)inhibiting endogenous cholesterol synthesis,(2)elevating the expression of genes related to cholesterol esterification and efflux,and(3)promoting chenodeoxycholic acid synthesis and ***,high cholesterol intake reshaped the fish gut microbiome by increasing the abundance of Lactobacillus *** Mycobacterium spp.,both of which are involved in cholesterol and/or bile acids ***,high cholesterol intake inhibited lipid catabolic activities through mitochondrialβ-oxidation,and lysosome-mediated lipophagy,and depressed insulin signaling *** catabolism was elevated as a compulsory response to maintain energy ***,although high cholesterol intake promoted growth,it led to metabolic disorders in *** the first time,this study provides evidence for the systemic metabolic response to high cholesterol intake in *** knowledge contributes to an understanding of the metabolic syndromes caused by high cholesterol intake or deposition in fish.

关键词： Cholesterol metabolism Metabolic response Energy metabolism Gut microbiome

Design and Implementation of Initial Cell Search in 5G NR Systems

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2020年第5期17卷 38-49页

作者： Fatang Chen Xiu Li yun Zhang Yanan Jiang College of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China China Telecom Corporation Limited Chongqing Branch Chongqing 400000China

The initial cell search plays an important role during the process of downlink synchronization establishment between the User Equipment(UE) and the base station. In particular, the uncertainty of the synchronization signals on the frequency domain and the flexibility of frame structure configuration have brought great challenges to the initial cell search for the fifth-generation(5G) new radio(NR). To solve this problem, firstly, we analyze the physical layer frame structure of 5G NR systems. Then, by focusing on the knowledge of synchronization signals, the 5G NR cell search process is designed, and the primary synchronization signal(PSS) timing synchronization algorithm is proposed, including a 5G-based coarse synchronization algorithm and conjugate symmetry-based fine synchronization algorithm. Finally, the performance of the proposed cell search algorithm in 5G NR systems is verified through the combination of Digital Signal Processing(DSP) and personal computer(PC). And the MATLAB simulation proves that the proposed algorithm has better performance than the conventional cross-correlation algorithm when a certain frequency offset exists.

关键词： 5G NR systems physical layer cell search PSS timing synchronization algorithm Conjugate symmetry

A privacy preserving two-factor authentication protocol for the Bitcoin SPV nodes

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2020年第3期63卷 34-48页

作者： Lu zhou Chunpeng GE Chunhua SU Division of Computer Science University of Aizu College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics

In the Bitcoin network, the simplified payment verification protocol(SPV) enables a lightweight device such as a mobile phone to participate in the bitcoin network without needed to download and store the whole Bitcoin blocks. A Bitcoin SPV node initiates and verifies transactions of the Bitcoin network through the Bitcoin wallet software which is deployed on a resource constrained device such as a mobile phone. Thus, the security of the wallet is critical for the SPV nodes as it may affect the security of user’s cryptocurrencies. However, there are some concerns about the security flaws within the SPV nodes which could lead to significant economic losses. Most of these vulnerabilities can be resolved by employing a secure user authentication protocol. Over the years, researchers have engaged in designing a secure authentication protocol. However, most proposals have security flaws or performance issues. Recently, Park et al. proposed a two-party authenticated key exchange protocol for the mobile environment. They claimed that their protocol is not only secure against various attacks but also can be deployed efficiently. However, after a thorough security analysis, we find that the Park et al.’s protocol is vulnerable to user forgery attack, smart card stolen attack and unable to provide user anonymity. To enhance security, we proposed an efficient and secure user authentication protocol for the SPV nodes in the mobile environment which can fulfill all the security requirements and has provable security. Additionally, we provide performance analysis which shows our proposed protocol is efficient for the SPV nodes in the Bitcoin network.

关键词： SPV nodes secure authentication two-factor Bitcoin

Controlled-release fertilizer(CRF): A green fertilizer for controlling non-point contamination in agriculture

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第2期17卷 181-184页

作者： MAOXiao-yun SUNKe-jun WANGDe-han LIAOZong-wen CollegeofResourceandEnviromnentalSciences SouthChinaAgricultureUniversityGuangzhou510642China

Fertilizers contribute greatly to high yields but also result in environmental non-point contamination, including the emission of greenhouse gas(N 2O) and eutrophication of water bodies. How to solve this problem has become a serious challenge, especially for China as its high ecological pressure. Controlled-release fertilizer(CRF) has been developed to minimize the contamination while keeping high yield and has become a green fertilizer for agriculture. Several CRFs made with special coating technology were used for testing the fertilizer effects in yield and environment through pot experiment and field trial. The result indicated that the CRFs had higher N use efficiency, thus reducing N loss through leaching and volatilization while keeping higher yields. Comparing with imported standard CRFs, the test on CRFs showed similar fertilizer effect but with much lower cost. CRFs application is becoming a new approach for minimizing non-point contamination in agriculture.

关键词： controlled-release fertilizer N use efficiency non-point contamination

Biomedical Named Entity Recognition Based on Self-supervised Deep Belief Network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第3期29卷 455-462页

作者： ZHANG Yajun LIU Zongtian zhou Wen Shanghai Institute of Precision Measurement and Test School of Computer Engineering and Science Shanghai University

Named entity recognition is a fundamental and crucial issue of biomedical data mining. For effectively solving this issue, we propose a novel approach based on Deep belief network(DBN). We select nine entity features, and construct feature vector mapping tables by the recognition contribution degree of different values of them. Using the mapping tables, we transform words in biomedical texts to feature vectors. The DBN will identify entities by reducing dimensions of vector *** extensive experimental results reveal that the novel approach has achieved excellent recognition performance,with 69.96% maximum value of F-measure on GENIA 3.02 testing corpus. We propose a self-supervised DBN, which can decide whether to add supervised fine-tuning or not according to the recognition performance of each layer,can overcome the errors propagation problem, while the complexity of model is limited. Test analysis shows that the new DBN improves recognition performance, the Fmeasure increases to 72.12%.

关键词： Biomedical named entity recognition Feature selection Feature vector mapping Threshold judgement Self-supervision

Binary Hybrid Artificial Hummingbird with Flower Pollination Algorithm for Feature Selection in Parkinson’s Disease Diagnosis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第2期21卷 1003-1021页

作者： Liuyan Feng Yongquan zhou Qifang Luo College of Artificial Intelligence Guangxi University for NationalitiesNanning530006China Xiangsihu College of Guangxi University for Nationalities Nanning532100GuangxiChina Guangxi Key Laboratories of Hybrid Computation and IC Design Analysis Nanning530006China

Parkinson’s disease is a neurodegenerative disorder that inflicts irreversible damage on *** experimental data regarding Parkinson’s patients are redundant and irrelevant,posing significant challenges for disease ***,there is a need to devise an effective method for the selective extraction of disease-specific information,ensuring both accuracy and the utilization of fewer *** this paper,a Binary Hybrid Artificial Hummingbird and Flower Pollination Algorithm(FPA),called BFAHA,is proposed to solve the problem of Parkinson’s disease diagnosis based on speech ***,combining FPA with Artificial Hummingbird Algorithm(AHA)can take advantage of the strong global exploration ability possessed by FPA to improve the disadvantages of AHA,such as premature convergence and easy falling into local ***,the Hemming distance is used to determine the difference between the other individuals in the population and the optimal individual after each iteration,if the difference is too significant,the cross-mutation strategy in the genetic algorithm(GA)is used to induce the population individuals to keep approaching the optimal individual in the random search process to speed up finding the optimal ***,an S-shaped function converts the improved algorithm into a binary version to suit the characteristics of the feature selection(FS)*** this paper,10 high-dimensional datasets from UCI and the ASU are used to test the performance of BFAHA and apply it to Parkinson’s disease *** with other state-of-the-art algorithms,BFAHA shows excellent competitiveness in both the test datasets and the classification problem,indicating that the algorithm proposed in this study has apparent advantages in the field of feature selection.

关键词： Artificial Hummingbird Algorithm Flower pollination algorithm Feature selection Parkinson’s disease Meta-heuristic