检索结果-南通市图书馆

Predicting Resting-state Functional Connectivity With Efficient Structural Connectivity

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

IEEE/CAA Journal of Automatica Sinica 2018年第6期5卷 1079-1088页

作者： xue chen Yanjiang Wang College of Information and Control Engineering China University of Petroleum (East China)

The complex relationship between structural connectivity(SC) and functional connectivity(FC) of human brain networks is still a critical problem in neuroscience. In order to investigate the role of SC in shaping resting-state FC, numerous models have been proposed. Here, we use a simple dynamic model based on the susceptible-infected-susceptible(SIS) model along the shortest paths to predict FC from SC. Unlike the previous dynamic model based on SIS theory, we focus on the shortest paths as the principal routes to transmit signals rather than the empirical structural brain network. We first simplify the structurally connected network into an efficient propagation network according to the shortest paths and then combine SIS infection theory with the efficient network to simulate the dynamic process of human brain activity. Finally, we perform an extensive comparison study between the dynamic models embedded in the efficient network, the dynamic model embedded in the structurally connected network and dynamic mean field(DMF) model predicting FC from SC. Extensive experiments on two different resolution datasets indicate that i) the dynamic model simulated on the shortest paths can predict FC among both structurally connected and unconnected node pairs; ii) though there are fewer links in the efficient propagation network, the predictive power of FC derived from the efficient propagation network is better than the dynamic model simulated on a structural brain network; iii) in comparison with the DMF model,the dynamic model embedded in the shortest paths is found to perform better to predict FC.

关键词： Brain connectivity structure-function relationship susceptible-infected-susceptible (SIS)model the shortest paths

EVchain: An Anonymous Blockchain-Based System for Charging–Connected Electric Vehicles

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2021年第6期26卷 845-856页

作者： Shiyuan Xu xue chen Yunhua He North China University of Technology Beijing 100144China Beijing Key Laboratory of Internet of Things Security Institute of Information EngineeringChinese Academy of Sciences(CAS)Beijing 100093China

Purchases of electric vehicles have been increasing in recent years. These vehicles differ from traditional fossil-fuel-based vehicles especially in the time consumed to keep them running. Electric-Vehicle-charging Service Providers(EVSPs) must arrange reasonable charging times for users in advance. Most EVSP services are based on third-party platforms, but reliance on third-party platforms creates a lack of security, leaving users vulnerable to attacks and user-privacy leakages. In this paper, we propose an anonymous blockchain-based system for charging-connected electric vehicles that eliminates third-party platforms through blockchain technology and the establishment of a multi-party security system between electric vehicles and EVSPs. In our proposed system, digital certificates are obtained by completing distributed Public Key Infrastructure(distributed-PKI) identity registration,with the user registration kept separate from the verification process, which eliminates dependence on the EVSP for information security. In the verification process, we adopt smart contracts to solve problems associated with centralized verification and opaque services. Furthermore, we utilize zero-knowledge proof and ring-signature superposition to realize completely anonymous verification, which ensures undeniability and unforgeability with no detriment to anonymity. The evaluation results show that the user anonymity, information authenticity, and system security of our system fulfill the necessary requirements.

关键词： blockchain Electric Vehicles(EV) zero knowledge proof distributed Public Key Infrastructure(distributed-PKI) ring signature smart contract

Double Moving Extremes Ranked Set Sampling Design

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第1期40卷 75-90页

作者： Meng chen Wang-xue chen Rui Yang Department of Mathematics and Statistics Jishou UniversityJishou416000China

The traditional simple random sampling(SRS)design method is inefficient in many *** proposed some new designs to increase *** this paper,as a variation of moving extremes ranked set sampling(MERSS),double MERSS(DMERSS)is proposed and its properties for estimating the population mean are *** turns out that,when the underlying distribution is symmetric,DMERSS gives unbiased estimators of the population ***,it is found that DMERSS is more efficient than the SRS and MERSS methods for usual symmetric distributions(normal and uniform).For asymmetric distributions considered in this study,the DMERSS has a small bias and it is more efficient than SRS for usual asymmetric distribution(exponential)for small sample sizes.

关键词： double moving extremes ranked set sampling symmetric distribution efficiency

Anomalous Dispersion Behavior of Staggered Arranged Metal Nanowire Arrays

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2014年第3期31卷 140-143页

作者： chen Jun-xue SHANG Li-Ping School of Science Southwest University of Science and Technology Mianyang 621010 School of Information Engineering Southwest University of Science and Technology Mianyang 621010

The dispersion relations of staggered arranged metal nanowire arrays are numerically investigated. It is demonstrated that the structure can support the propagation of plasmon modes with zero and negative group velocities derived directly from the dispersion curves, apart from normal plasmon modes with positive group velocities. Furthermore, the effects of the structural parameters on the dispersion behaviors of plasmon modes are also examined.

关键词： NANOWIRES RESEARCH DISPERSION PLASMONS (Physics) EXCITATION spectrum PHYSICS research

Fisher information for generalized Rayleigh distribution in ranked set sampling design with application to parameter estimation

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

Applied Mathematics(A Journal of Chinese Universities) 2022年第4期37卷 615-630页

作者： SHEN Bing-liang chen Wang-xue WANG Shuo chen Meng Department of Mathematics and Statistics Jishou UniversityJishou 416000China

In the current paper,we considered the Fisher information matrix from the generalized Rayleigh distribution(GR)distribution in ranked set sampling(RSS).The numerical results show that the ranked set sample carries more information about λ and α than a simple random sample of equivalent *** order to give more insight into the performance of RSS with respect to(w.r.t.)simple random sampling(SRS),a modified unbiased estimator and a modified best linear unbiased estimator(BLUE)of scale and shape λ and α from GR distribution in SRS and RSS are *** numerical results show that the modified unbiased estimator and the modified BLUE of λ and α in RSS are significantly more efficient than the ones in SRS.

关键词： ranked set sample Fisher information number best linear unbiased estimator

Temperature-Dependent Thermal Conductivity and Absorption Coefficient Identification of Quartz Window up to 1100 K

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第1期32卷 44-58页

作者： SHI Yu chen xue SUN Chuang XIA Xin-Lin School of Energy Science and Engineering Harbin Institute of Technology(HIT)Harbin 150001China

The temperature-dependent absorption coefficient and thermal conductivity of a quartz window are obtained through experimental tests at a wide range of temperatures.A Fourier transform infrared spectrometer with a heated cavity is used for performing the transmittance *** spectral absorption coefficient of the quartz window is inverted by the transmittance information at different temperatures using a genetic ***,a quartz window-graphite plate-quartz window multilayer structure is designed,and the transient response of the structure subjected to high-temperature heating is recorded by a self-designed *** with the above absorption coefficient,a non-gray radiative-conductive heat transfer model is built for the multilayer structure,and the intrinsic thermal conductivity of the quartz window is ***,the effects of the temperature-dependent absorption coefficient and spectral selective features of the medium on the heat transfer characteristics are *** results show that the absorption coefficient gradually increases with *** intrinsic thermal conductivity of the quartz window varies from 1.35 to 2.52 W/(m·K)as the temperature rises,while the effective thermal conductivity is higher than the intrinsic thermal conductivity due to thermal radiation,specifically 26.4%higher at 1100 *** addition,it is found that the influence of the temperature-dependent absorption coefficient on temperature of unheated side shows a trend of first increasing and then *** the absorption coefficient varies greatly with wavelength,a non-gray radiative-conductive heat transfer model should be built for the semitransparent materials.

关键词： semitransparent material quartz window non-gray body absorption coefficient thermal conductivity

Joint Allocation of Computing and Connectivity Resources in Survivable Inter-Datacenter Elastic Optical Networks

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第8期21卷 172-181页

作者： Yang Tao Li Yang chen xue State Key Lab of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China Cloud Network Department China Telecom Group Beijing CorporationBeijing 100010China

Inter-datacenter elastic optical networks(EON)need to provide the service for the requests of cloud computing that require not only connectivity and computing resources but also network *** this paper,to realize joint allocation of computing and connectivity resources in survivable inter-datacenter EONs,a survivable routing,modulation level,spectrum,and computing resource allocation algorithm(SRMLSCRA)algorithm and three datacenter selection strategies,*** Resource First(CRF),Shortest Path First(SPF)and Random Destination(RD),are proposed for different *** and manycast are applied to the communication of computing requests,and the routing strategies are calculated *** results show that SRMLCRA-CRF can serve the largest amount of protected computing tasks,and the requested calculation blocking probability is reduced by 29.2%,28.3%and 30.5%compared with SRMLSCRA-SPF,SRMLSCRA-RD and the benchmark EPS-RMSA algorithms ***,it is more applicable to the networks with huge ***,SRMLSCRA-SPF consumes the least spectrum,thereby exhibiting its suitability for scenarios where the amount of calculation is small and communication resources are *** results demonstrate that the proposed methods realize the joint allocation of computing and connectivity resources,and could provide efficient protection for services under single-link failure and occupy less spectrum.

关键词： computing and connectivity interdatacenter networks joint resource allocation service protection

Science Letters:Anodic oxidation of salicylic acid at Ta/BDD electrode

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1457-1461页

作者： ZHANG Juan chen xue-ming YAO Pei-dong chen Guo-hua Environmental Engineering Department Zhejiang University Hangzhou 310027 China Chemical Engineering Department The Hong Kong Univet＇sity of Science and Technology. Clear Water Ba~ Kowloon Hong Kong China

Boron-doped diamond （BDD） film electrodes using Ta as substrates were employed for anodic oxidation of salicylic acid （SA）. The effects of operational variables including initial concentration, current density, temperature and pH were examined. The results showed that BDD films deposited on the Ta substrates had high electrocatalytic activity for SA degradation. There was little effect ofpH on SA degradation. The current efficiency （CE） ,aas fbund to be dependent mainly on the initial SA concentration, current density and temperature. Chemical oxygen demand （COD） was reduced from 830 mg/L to 42 mg/L under a current density of200A/m^2 at 30℃.

关键词： Salicylic acid (SA) Anodic oxidation Ta/BDD Current efficiency (CE) Electrocatalytic activity

LaMnO_(3)/Co_(3)O_(4) nanocomposite for enhanced triethylamine sensing properties

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第4期42卷 733-742页

作者： Jian Zhang Yanping chen Ling Li xue chen Wenya An Xiujuan Qian Yuye Tao School of Science Shandong Jianzhu UniversityJinan250100China

LaMnO_(3) modified Co_(3)O_(4) nanocomposites were prepared by simple hydrothermal method co mbined with sol-gel *** gas sensitivity properties of pure Co_(3)O_(4) and LaMnO_(3)/Co_(3)O_(4) with different composite proportions are *** is found that 0.6-LMO/Co_(3)O_(4) sensor has higher sensitivity to triethylamine(TEA)than pure Co_(3)O_(4) sensor,which is improved by 9.27 *** the working temperature is reduced from 150 to 130℃.Besides,it has excellent gas selectivity and *** improvement of the gas sensitivity of LaMnO_(3)/Co_(3)O_(4) sensor may be due to the fact that LaMnO_(3) is an effective catalyst,and the catalytic performance perhaps is beneficial to improving the sensing *** addition,the formation of p-p heterojunctions may be the key factor to improve the gas sensing *** work provides a new Co_(3)O_(4)-based gas sensing material for the detection of TEA.

关键词： Gas sensing Co_(3)O_(4) LaMnO_(3) Triethylamine Rareearths