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Urban development and resource endowments shape natural resource utilization efficiency in Chinese cities

Journal of Environmental Sciences 2023年第4期126卷 806-816页

作者： yanbing liu Fei Lu Chaofan Xian Zhiyun Ouyang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Improving the efficiency with which natural resources are utilized is an indispensable for achieving sustainable development and carbon neutrality. By analyzing the utilization efficiency of energy, water, and land, we established a comprehensive natural resource utilization efficiency index(NRUEI). We then calculated the 2016 index for 165 cities in China,and investigated what caused it to vary. We found three main results:(1) the NRUEI varied greatly across China and there were significant positive correlations between urban energy utilization efficiency(EUE), water utilization efficiency(WUE) and land utilization efficiency(LUE);(2) the NRUEI showed a significant positive correlation with a city’s population size,economy(Gross Domestic Product(GDP)), and the level of urban social development(GDP per capita);(3) cities in East China have the highest natural resource utilization efficiency,while cities in Northeast China have the lowest. These results indicate that China’s increasing urban development is associated with rising natural resource utilization efficiency and that the city’s endowment of natural resources is an important factor affecting that efficiency. Further, the results showed that the determinants of a city’s NRUEI differed in large and small cities. Lastly, our results suggest that improving EUE is key for improving NRUEI in urban China, and different efficiencies can be improved intertwined. A major takeaway of this study is that there is great potential for improving natural resource utilization efficiency in Chinese cities and we include city-specific suggestions for efficiency improvements.

关键词： Urban development Resource endowment Resource utilization efficiency Sustainable city

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A malware propagation prediction model based on representation learning and graph convolutional networks

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Digital Communications and Networks 2023年第5期9卷 1090-1100页

作者： Tun Li yanbing liu Qilie liu Wei Xu Yunpeng Xiao Hong liu College of Computer Science and Technology Chongqing University of Posts and TelecommunicationsChongqing400065China

The traditional malware research is mainly based on its recognition and detection as a breakthrough point,without focusing on its propagation trends or predicting the subsequently infected *** complexity of network structure,diversity of network nodes,and sparsity of data all pose difficulties in predicting *** paper proposes a malware propagation prediction model based on representation learning and Graph Convolutional Networks(GCN)to address the aforementioned ***,to solve the problem of the inaccuracy of infection intensity calculation caused by the sparsity of node interaction behavior data in the malware propagation network,a mechanism based on a tensor to mine the infection intensity among nodes is proposed to retain the network structure *** influence of the relationship between nodes on the infection intensity is also ***,given the diversity and complexity of the content and structure of infected and normal nodes in the network,considering the advantages of representation learning in data feature extraction,the corresponding representation learning method is adopted for the characteristics of infection intensity among *** can efficiently calculate the relationship between entities and relationships in low dimensional space to achieve the goal of low dimensional,dense,and real-valued representation learning for the characteristics of propagation spatial *** also design a new method,Tensor2vec,to learn the potential structural features of malware ***,considering the convolution ability of GCN for non-Euclidean data,we propose a dynamic prediction model of malware propagation based on representation learning and GCN to solve the time effectiveness problem of the malware propagation *** experimental results show that the proposed model can effectively predict the behaviors of the nodes in the network and discover the influence of different characteristics of nodes on the mal

关键词： Malware Representation learning Graph convolutional networks(GCN) Tensor decomposition Propagation prediction

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A User Participation Behavior Prediction Model of Social Hotspots Based on Influence and Markov Random Field

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China Communications 2017年第5期14卷 145-159页

作者： Yunpeng Xiao Jiawei Lai yanbing liu Chongqing Engineering Laboratory of Network and Information Security Chongqing University of Posts and TelecommunicationsChongqing 400065China

Hotspot topic trends can be captured by analyzing user attributes and historical behavior in social network. In this paper, we propose a user participation behavior prediction model for social hotspots, based on user behavior and relationship data, to predict user participation behavior and topic development trends. Firstly, for the complex factors of user behavior, three dynamic influence factor functions are defined, including individual, peer and community influence. These functions take timeliness into account using a time discretization method. Secondly, to determine laws of individual behavior and group behavior within a social topic, a hotspot user participation behavior prediction model is proposed and associated with the basic concepts of randora field and Markov property in information diffusion. The experimental results show that the model can not only dynamically predict the individual behavior, but also grasp the development trends of topics.

关键词： social network hotspot topic behavior prediction Markov random field influence factor

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A dynamic influence model of social network hotspot based on grey system

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Science China(Information Sciences) 2015年第12期58卷 63-74页

作者： XIAO YunPeng MA Jing liu yanbing YAN ZhiXian Chongqing University of Posts and Telecommunications (CQUPT) Swiss Federal Institute of Technology (EPFL)

The outbreak of hotspot in social network may contain complex dynamic genesis. Using user behavior data from hotspots in social network, we study how different user groups play different roles for a hotspot topic. Firstly, by analyzing users’ behavior records, we mine group situation that promotes the *** major attributions in a hotspot outbreak, such as individual, peer and group triggers, are defined formally according to the view-point of social identity, social interaction, retweet depth and opinion leader. Secondly,for the problem of the uneven and sparse data in each stage of hotspot topic’s life cycle, we propose a dynamic influence model based on grey system to formalize the effect of different groups. Then the process of hotspot evolution driven by distinct crowd is showed dynamically. The experimental result confirms that the model is able not only to qualify users’ influence on a hotspot topic but also to predict effectively an upcoming change in a hotspot topic.

关键词： social network hotspot topic grey system influence model dynamic evolution

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Bayonet-corpus:a trajectory prediction method based on bayonet context and bidirectional GRU

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Digital Communications and Networks 2021年第1期7卷 72-81页

作者： Mengyang Huang Menggang Zhu Yunpeng Xiao yanbing liu School of Computer Science and Technology Chongqing University of Posts and TeleconvnunicationsChongqing400065China

Predicting travel trajectory of vehicles can not only provide personalized services to users,but also have a certain effect on traffic guidance and traffic *** this paper,we build a Bayonet-Corpus based on the context of traffic intersections,and use it to model a traffic ***,Bidirectional Gated Recurrent Unit(Bi-GRU)is used to predict the sequence of traffic intersections in one single ***,considering that real traffic networks are usually complex and disorder and cannot reflect the higher dimensional relationship among traffic intersections,this paper proposes a new traffic network modeling algorithm based on the context of traffic intersections:inspired by the probabilistic language model,a Bayonet-Corpus is constructed from traffic intersections in real trajectory sequence,so the high-dimensional similarity between corpus nodes can be used to measure the semantic relation of real traffic *** algorithm maps vehicle trajectory nodes into a high-dimensional space vector,blocking complex structure of real traffic network and reconstructing the traffic network ***,the bayonets sequence in real traffic network is mapped into a *** the trajectories sequence is bidirectional,and Bi-GRU can handle information from forward and backward simultaneously,we use Bi-GRU to bidirectionally model the trajectory matrix for the purpose of prediction.

关键词： Trajectory prediction Bayonet-corpus Traffic network modeling Bidirectional gated recurrent unit

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SDSA: A Framework of a Software-Defi ned Security Architecture

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China Communications 2016年第2期13卷 178-188页

作者： liu yanbing LU Xingyu JIAN Yi XIAO Yunpeng Chongqing Engineering Laboratory of Network and Information Security Chongqing University of Posts and Telecommunications

The fact that the security facilities within a system are closely coupled and the security facilities between systems are unconnected results in an isolated protection structure for systems, and gives rise to a serious challenge to system security integrations and system controls. Also, the need for diversified services and flexible extensions of network security asks for more considerations and contribu?tions from the perspective of software engineering in the process of designing and constructing security systems. Based on the essence of the virtualization technique and the idea of software-defined networks, we in this paper propose a novel software-defi ned security architecture for systems. By abstracting the traditional security facilities and techniques, the proposed security architecture provides a new, simple, effective, and programmable framework in which security operations and security controls can be decoupled, and thereby reduces the software module sizes, decreases the intensity of software deve?lopments, and improves the security extensibility of systems.

关键词： information security networksecurity security architecture software-definedsecurity

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Who will retweet? A prediction method for social hotspots based on dynamic tensor decomposition

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Science China(Information Sciences) 2018年第9期61卷 297-299页

作者： Yunpeng XIAO Xiaojuan LI Shasha YANG yanbing liu Chongqing Engineering Laboratory of Internet and Information Security Chongqing University of Posts and Telecommunications

With the development of Web 2.0,the emergence of blogs,forums makes the Internet to maintain substantial amounts of user behavioral *** data are rich and valuable,and mining useful information from massive data has be... 详细信息

关键词： A prediction method for social hotspots based on dynamic tensor decomposition Who will retweet

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Lower crustal attenuation in northeastern Tibetan Plateau from ML amplitude

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Earthquake Science 2021年第4期34卷 378-386页

作者： yanbing liu Shunping Pei Beijing Earthquake Agency Beijing 100080China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China

This study investigated the crustal attenuation structures of Sg and Lg waves of the northeastern Tibetan *** collected ML amplitude data recorded at 168 permanent stations between 1985 and 2016 and 11 temporary broadband stations between 2014 and *** Q0 variation maps of Sg and Lg waves were obtained by applying ML amplitude *** average Q0 values of the Sg and Lg wave were 440 and 220,*** high attenuation anomalies of both waves appeared in the central and eastern regions of the Bayan Har Block and the east edge of the Qiangtang Block,which may be related to partial melting,high geotemperature,and strong tectonic *** attenuation anomalies were also found in the Qilian Orogenic Belt and Hetao Graben,which may be related to their active tectonic behavior and densely distributed *** relatively low attenuation anomalies of both waves were revealed in the Alax and Ordos blocks,Qaidam,Tarim,Qinghai Lake,and Gonghe basins,which can be explained by the tectonically stable properties and ancient composition of geological *** results indicate that the path between the highly attenuated lower crust of the Bayan Har Block and the Qilian Orogenic Belt is obstructed by three adjacent low attenuated areas(i.e.,the Qilian,Qinghai Lake,and Gonghe basins);thus,it appears unlikely that a crustal flow channel from the interior of the Tibetan Plateau to the Qilian Orogenic Belt will form.

关键词： lower crust attenuation northeastern Tibetan Plateau Q value

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A parallel matching algorithm based on order relation for HLA data distribution management

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第2期6卷 1-15页

作者： yanbing liu Hongbo Sun Wenhui Fan Tianyuan Xiao Department of Automation Tsinghua University BeijingP.R.China

In distribution simulation based on High-level architecture(HLA),data distribution management(DDM)is one of HLA services for the purpose of filtering the unnecessary data transferring over the *** admits the sending federates and the receiving federates to express their interest using update regions and subscription regions in a multidimensional routing *** are several matching algorithms to obtain overlap information between the update regions and subscription *** the number of regions increase sharply,the matching process is time ***,the existing algorithms is hard to be parallelized to take advantage of the computing capabilities of multi-core *** reduce the computational overhead of region matching,we propose a parallel algorithm based on order relation to accelerate the matching *** new matching algorithm adopts divide-and-conquer approach to divide the regions into multiple region bound sublists,each of which comprises parts of region *** calculate the intersection inside and amongst the region bound sublists,two matching rules are *** approach has good performance since it performs region matching on the sublists parallel and does not require unnecessary comparisons within regions in different *** analysis has been carried out for the proposed algorithm and experimental result shows that the proposed algorithm has better performance than major existing DDM matching algorithms.

关键词： High-level architecture data distribution management matching algorithm

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Base-or acid-assisted polystyrene plastic degradation in supercritical CO_(2)

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Waste Disposal and Sustainable Energy 2023年第2期5卷 165-175页

作者： yanbing liu Jinwen Shi liuhao Mao Bingru Lu Xing Kang Hui Jin International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong University28 West Xianning RoadXi’an710049ShaanxiChina

Plastic has caused serious"white pollution"to the environment,and the highly inert characteristics of plastic bring a major challenge for *** fluids have unique physical properties and have been widely used in various *** this work,supercritical CO_(2)(Sc-CO_(2))with mild conditions was selected and assisted by NaOH/HCl solution to degrade polystyrene(PS)plastic,and the reaction model was designed using response surface methodology(RSM).It was found that,regardless of the types of assistance solutions,the factors affecting PS degradation efficiencies were reaction temperature,reaction time,and NaOH/HCl *** the temperature of 400℃,time of 120 min,and base/acid concentration of 5%(in weight),0.15 g PS produced 126.88/116.99±5 mL of gases with 74.18/62.78±5 mL of H2,and consumed 81.2/71.5±5 mL of CO_(2).Sc-CO_(2)created a homogeneous environment,which made PS highly dispersed and uniformly heated,thus promoting the degradation of ***,Sc-CO_(2)also reacted with the degradation products to produce new CO and more CH_(4)and C_(2)H_(x)(x=4,6).Adding NaOH/HCl solution not only improved the solubility of PS in Sc-CO_(2),but also provided a base/acid environment that reduced the activation energy of the reaction,and effectively improved the degradation efficiencies of *** short,degrading PS in Sc-CO_(2)is feasible,and better results are obtained with the assistance of base/acid solution,which can provide a reference for the disposal of waste plastics in the future.

关键词： Plastic degradation Polystyrene Supercritical CO_(2) NaOH HCl

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