检索结果-南通市图书馆

Efficient multi-scale community search method based on spectral graph wavelet

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

Frontiers of Computer Science 2023年第5期17卷 89-101页

作者： Cairui YAN Huifang MA Qingqing LI Fanyi YANG Zhixin LI College of Computer Science and Engineering Northwest Normal UniversityLanzhou 730070China Guangxi Key lab of Multi-source Information Mining and Security Guangxi Normal UniversityGuilin 541004China

Community search is an important problem in network analysis,which has attracted much attention in recent *** a query-oriented variant of community detection problem,community search starts with some given nodes,pays more attention to local network structures,and gets personalized resultant communities *** existing community search method typically returns a single target community containing query nodes by *** is a strict requirement and does not allow much *** many realworld applications,however,query nodes are expected to be located in multiple communities with different *** address this limitation of existing methods,an efficient spectral-based Multi-Scale Community Search method(MSCS)is proposed,which can simultaneously identify the multi-scale target local communities to which query node *** MSCS,each node is equipped with a graph Fourier multiplier *** access of the graph Fourier multiplier operator helps nodes to obtain feature representations at various community *** addition,an efficient algorithm is proposed for avoiding the large number of matrix operations due to spectral *** experimental evaluations on a variety of real-world datasets demonstrate the effectiveness and efficiency of the proposed method.

关键词： community search multi-scale spectral wavelets

Solvent and additive-free selective aerobic allylic hydroxylation of β-pinene catalyzed by metalloporphyrins

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第3期28卷 575-578页

作者： Shi-Chao Xu Shou-Ji Zhu Liang-Wu Bi Yu-Xiang Chen Jing Wang Yan-Ju Lu Yan Gu Zhen-Dong Zhao Institute of Chemical Industry of Forest Products Chinese Academy of Forestry Nanjing 210042 China Key lab. of Biomass Energy and Material Jiangsu Province Nanjing 210042 China National Engineering lab. for Biomass Chemical Utilization Nanjing 210042 China Key and Open lab. on Forest Chemical Engineering State Forestry Administration Nanjing 210042 China Institute of Forestry New Technology Chinese Academy of Forestry Beijing 100091 China 2011 Collaborative Innovation Center of Jiangxi Typical Trees Cultivation and Utilization in Jiangni Agricultural University Nanchang 330045 China

Metallodeuteroporphyrins（MDPs） were employed as the catalysts for aerobic oxidation of β-pinene in absence of solvents and additives. Allylic hydroxylation products were found to be the main products from this protocol. The catalytic activity of MDPs with different metal nuclei and the influences of technological conditions on this reaction were investigated. This catalytic system has bright application prospect since only eco-friendly and readily available dioxygen were needed.

关键词： Turpentine transformatio β-Pinene Metalloporphyrin Biomimetic catalysis Aerobic allylic hydroxylation

Event-triggered consensus control of heterogeneous multi-agent systems: model-and data-based approaches

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2023年第9期66卷 151-167页

作者： Xin WANG Jian SUN Fang DENG Gang WANG Jie CHEN School of Automation Beijing Institute of Technology National Key lab of Autonomous Intelligent Unmanned Systems Beijing Institute of Technology Chongqing Innovation Center Department of Control Science and Engineering Tongji University

This article addresses the model-and data-based event-triggered consensus of heterogeneous leader/follower multi-agent systems(MASs). A dynamic periodic transmission protocol is developed to alleviate the communication and computational burden, where the followers can interact locally with neighbors to approach the dynamics of the leader. Capitalizing on a discrete-time looped-functional, a model-based consensus condition for the closed-loop MASs is derived as linear matrix inequalities(LMIs), along with a design method for obtaining distributed event-triggered controllers and the associated triggering *** collecting noise-corrupted state-input measurements in offline open-loop experiments, a data-based leader/follower MAS representation is derived and employed to address the data-driven consensus control problem without explicit MAS models. This result is subsequently generalized to guarantee an H∞-consensus control performance. Finally, a simulation example is given to corroborate the efficiency of the proposed distributed triggering scheme and the data-driven consensus controller.

关键词： data-driven control multi-agent system consensus looped-functional LMI

Generalized multipath planning model for ride-sharing systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2014年第1期8卷 100-118页

作者： Jamal YOUSAF JuanziLI Lu CHEN Jie TANG Xiaowen Dai Department of Computer Science and Technology Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing 100084 China. General Motors China Science Lab Shanghai 201303 China

Ride-sharing systems should combine environ- mental protection （through a reduction of fossil fuel usage）, socialization, and security. Encouraging people to use ride- sharing systems by satisfying their demands for safety, pri- vacy and convenience is challenging. Most previous works on this topic have focused on finding a fixed path between the driver and the riders either based solely on their loca- tions or using social information. The drivers＇ and riders＇ lack of options to change or compute the path according to their own preferences and requirements is problematic. With the advancement of mobile social networking technologies, it is necessary to reconsider the principles and desired character- istics of ride-sharing systems. In this paper, we formalized the ride-sharing problem as a multi source-destination path plan- ning problem. An objective function that models different ob- jectives in a unified framework was developed. Moreover, we provide a similarity model, which can reflect the personal preferences of the rides and utilize social media to obtain the current interests of the riders and drivers. The model also al- lows each driver to generate sub-optimal paths according to his own requirements by suitably adjusting the weights. Two case studies have shown that our system has the potential to find the best possible match and computes the multiple opti- mal paths against different user-defined objective functions.

关键词： ride-sharing path planning dynamic optimiza-tion

Composite Anti-Disturbance Control of Hidden Semi-Markov Jump Systems via Disturbance Observer

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2023年第6期36卷 2255-2273页

作者： MEN Yunzhe SUN Jian National Key lab of Autonomous Intelligent Unmanned Systems School of AutomationBeijing Institute of TechnologyBeijing100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing401120China

This paper focuses on the disturbance suppression issue of hidden semi-Markov jump systems leveraging composite *** system consists of a semi-Markov layer and an observed mode sequence layer,and it is subject to a matched disturbance generated by an exogenous system and a mismatched disturbance that is norm *** proposal is to design a composite controller based on a disturbance observer to counteract and attenuate the disturbances *** constructing a special Lyapunov function comparison point,the exponential stability is analyzed with the stability criterion in the form of linear matrix inequality is *** simulation examples are provided to demonstrate the practical merits of the composite controller relative to the single H_(∞)control.

关键词： Composite control disturbance observer ε-error hidden semi-Markov jump systems

In Situ Synchrotron Radiation Techniques: Watching Deformation-induced Structural Evolutions of Polymers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2018年第10期36卷 1093-1102页

作者： Liang-Bin Li National Synchrotron Radiation lab Chinese Academy of Sciences Key Laboratory of Soft Matter Chemistry Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film University of Science and Technology of China

Synchrotron radiation （SR） provides highly brilliant light with tunable wavelength from hard X-ray to far infrared, on which scattering, spectroscopy and imaging techniques with high time and spatial resolutions have been developed for in situ study on biological system and materials like polymer. With examples on flow-induced crystallization of polymer, deformation of nanoparticle filler network in rubber composite and necking propagation in tensile stretch, current work attempts to demonstrate the advantages of in situ synchrotron radiation X-ray scattering, X-ray nano-CT and infrared imaging in the study of deformation-induced multi-scale structural evolutions of polymers. With time resolution up to sub-ms, synchrotron radiation is expected to play a great role in understanding non-equilibrium polymer physics under processing and service conditions, while high-throughput characterization platform based on synchrotron radiation opens the possibility to establish polymer Materials Genome database in processing parameter space within reasonable time, which can serve as the roadmap for industrial polymer processing and accelerate material innovation.

关键词： Synchrotron radiation techniques X-ray nano-CT Flow-induced crystallization Necking propagation Rubber nanocomposite

Cooperative resource allocation in cognitive wireless powered communication networks with energy accumulation and deadline requirements

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2019年第8期62卷 145-158页

作者： Ding XU Qun LI Wireless Communication Key lab of Jiangsu Province Nanjing University of Posts and Telecommunications Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks Nanjing University of Posts and Telecommunications

This study investigates a multi-carrier cognitive wireless powered communication network(CWPCN) with a wirelessly powered primary user(PU). A two-stage cooperative protocol between the PU and the secondary user(SU) is adopted so that the PU can harvest energy from the SU while the SU gains transmission opportunities. It is assumed that the energy harvested by the PU can be accumulated for future usage, and the quality of service of the PU is guaranteed by satisfying the required minimum number of data bits for a given deadline. Herein, we maximize the SU rate by considering the time allocation,subcarrier allocation, and power allocation in both an offline setting(in which the future channel gains are known a priori) and an online setting(in which only the current channel gains are known). In the offline and online schemes, the maximization problem is solved using the block-coordinate descent method and the Lagrange duality method. The effectiveness of the proposed schemes is evaluated and verified via simulation experiments against benchmark schemes.

关键词： wireless powered communication networks energy harvesting cognitive radio deadline constraint energy accumulation

Gas seepage equation of deep mined coal seams and its application

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 China University of Mining and Technology 2008年第4期18卷 483-487页

作者： HU Guo-zhong WANG Hong-tu TAN Hai-xiang FAN Xiao-gang YUAN Zhi-gang Key lab for Exploitation of China Southwestern Resources ＆ Environmental Disaster Control Engineering Ministry of Education Chongqing University Chongqing 400030 China

In order to obtain a gas seepage law of deep mined coal seams, according to the properties of coalbed methane seepage in in-situ stress and geothermal temperature fields, the gas seepage equation of deep mined coal seams with the Klinkenberg effect was obtained by confirming the coatbed methane permeability in in-situ stress and geothermal temperature fields. aimed at the condition in which the coal seams have or do not have an outcrop and outlet on the ground, the application of the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields on the gas pressure calculation of deep mined coal seams was investigated. The comparison between calculated and measured results indicates that the calculation method of gas pressure, based on the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields can accu- rately be identical with the measured values and theoretically perfect the calculation method of gas pressure of deep mined coal seams.

关键词： deep mining in-situ stress field geothermal temperature field gas seepage equation of coal seam gas pressure

Strong,Removable,and Photoluminescent Hyperbranched Polyamide-amine Hot Melt Adhesive

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第10期39卷 1319-1327,I0008页

作者： Si-Jia Zhang Xing-Xing Chen Chen-Hui Cui Li Ma Qian-Yun Zhong Kai-Xiang Shen Jing Yu Zhen Li You-Shen Wu Qiang Zhang Yi-Long Cheng Ling He Yan-Feng Zhang School of Chemistry and Ministry of Education Key laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key lab for Strength and Vibration of Mechanical Structures Xi'an Jiaotong UniversityXi'an 710049China

The development of adhesive technology is gaining increasing attention in machinery,electronics,aviation,and other ***,traditional adhesives are difficult to be peeled and removed after cross-linking and curing due to the limited solubility in common solvents,which causes pollution and damage to the surface of the *** this work,we synthesized random hyperbranched polyamide-amine hot melt adhesives through Michael addition of 1,8-octanediamine and N,N’-methylene diacrylamide(ODA-RHP HMA).Owing to the presence of various polar groups,ODA-RHP HMA exhibited robust lap shear strength to different substrates,including glass(6.6 MPa),ceramics(10.3 MPa),steel(11.5 MPa),and aluminum(11.8 MPa).Due to the hydrogen bonds in ODA-RHP,the HMA demonstrated intrinsic self-healing ability,which can be used repeatedly when being subjected to cyclic heating and *** ODA-RHP HMA can be swollen or dissolved in ethanol,the adhesives can be easily removed through *** addition,ODA-RHP exhibited aggregation-induced luminescence due to the tertiary amine structure in the molecular structure of ODA-RHP,which can be used in the field of cultural relics restoration.

关键词： Hot melt adhesive Polyamide-amine Reusability Cultural relics restoration