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Seasonal variations of transport pathways and potential sources of PM2.5 in Chengdu, China （2012-2013）

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Frontiers of Environmental Science & Engineering 2018年第1期12卷 137-147页

作者： Yuan Chen Shaodong Xie bin luo School of Safety and Environmental Engineering Capital University of Economics and Business Beijing 100070 China College of Environmental Sciences and Engineering Peking University Beijing 100871 China Sichuan Provincial Environmental Monitoring Center Chengdu 610041 China

Seasonal pattem of transport pathways and potential sources of PM2.5 in Chengdu during 2012 2013 were investigated based on hourly PM2.5 data, backward trajectories, clustering analysis, potential source contribution function （PSCF）, and concentration-weighted trajectory （CWT） method. The annual hourly mean PM2.5 concentration in Chengdu was 97.4 μg. rn . 5, 5, 5 and 3 mean clusters were generated in four seasons, respectively. Short-distance air masses, which travelled within the Sichuan Basin with no specific source direction and relatively high PM2.5 loadings （〉80 μg.m 3） appeared as important pathways in all seasons. These short pathways indicated that emissions from both local and surrounding regions of Chengdu contributed significantly to PM2.5 pollution. The cities in southern Chengdu were major potential sources with PSCF〉0.6 and CWT〉90 /g.m-3.

关键词： Transport pathwayBackward trajectoryClustering analysisPotential sourceChengdu

Detecting APT-Exploited Processes through Semantic Fusion and Interaction Prediction

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Computers, Materials & Continua 2024年第2期78卷 1731-1754页

作者： bin luo Liangguo Chen Shuhua Ruan Yonggang luo School of Cyber Science and Engineering Sichuan UniversityChengdu610065China Key Laboratory of Data Protection and Intelligent Management(Sichuan University) Ministry of EducationChengdu610065China Cyber Science Research Institute Sichuan UniversityChengdu610065China

Considering the stealthiness and persistence of Advanced Persistent Threats(APTs),system audit logs are leveraged in recent studies to construct system entity interaction provenance graphs to unveil threats in a ***-based provenance graph APT detection approaches require elaborate rules and cannot detect unknown attacks,and existing learning-based approaches are limited by the lack of available APT attack samples or generally only perform graph-level anomaly detection,which requires lots of manual efforts to locate attack *** paper proposes an APT-exploited process detection approach called ThreatSniffer,which constructs the benign provenance graph from attack-free audit logs,fits normal system entity interactions and then detects APT-exploited processes by predicting the rationality of entity ***,ThreatSniffer understands system entities in terms of their file paths,interaction sequences,and the number distribution of interaction types and uses the multi-head self-attention mechanism to fuse these ***,based on the insight that APT-exploited processes interact with system entities they should not invoke,ThreatSniffer performs negative sampling on the benign provenance graph to generate non-existent edges,thus characterizing irrational entity interactions without requiring APT attack *** last,it employs a heterogeneous graph neural network as the interaction prediction model to aggregate the contextual information of entity interactions,and locate processes exploited by attackers,thereby achieving fine-grained APT *** results demonstrate that anomaly-based detection enables ThreatSniffer to identify all attack *** to the node-level APT detection method APT-KGL,ThreatSniffer achieves a 6.1%precision improvement because of its comprehensive understanding of entity semantics.

关键词： Advanced persistent threat provenance graph multi-head self-attention graph neural network

Strong hopping induced Dzyaloshinskii–Moriya interaction and skyrmions in elemental cobalt

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npj Computational Materials 2019年第1期5卷 708-713页

作者： Hu-bin luo Hong-bin Zhang JPing Liu Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of Sciences315201 NingboChina Department of Materials and Geosciences TU Darmstadt64287 DarmstadtGermany Department of Physics University of Texas at ArlingtonArlingtonTX 76091USA

The Dzyaloshinskii–Moriya interaction(DMI)is well known to favor a chiral rotation of the magnetic moments,which accounts for the emergence of the *** DMI is a combined effect of spin–orbit coupling with broken inversion symmetry in *** of the noncentrosymmetric magnetic materials that bear skyrmions involve nonmagnetic *** work shows that strong DMIs exist in elemental cobalt with a β-Mn-type metastable *** variation of DMI among different cobalt pairs largely follows the variation of hopping magnitude in which p electrons play an important *** the DMIs between different atomic pairs partly cancels with each other,the net interaction is sufficient to result in a left-handed Bloch-type *** dynamics simulation shows that a critical magnetic field of 2.9 T stabilizes skyrmions at 0 K.

关键词： structure cobalt interaction

Land degradation and management of red beds in China:Two case studies

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Journal of Mountain Science 2019年第11期16卷 2591-2604页

作者： YAN luo-bin Milica KASANIN-GRUbin School of Geographical Sciences Southwest UniversityChongqing400715 China Institute of Chemistry Technology and MetallurgyUniversity of BelgradeBelgrade 11000Serbia

Red beds cover approximately 9.5%of China,and are home to approximately 144 million *** total,83%of these lands are distributed in humid regions making it an important part of research on red bed soil erosion in China in these *** paper presents the main types of land degradation in red bed landscapes and the status of current soil erosion in a typical red bed basin,the Nanxiong Basin located in the north of Guangdong Province,China,and establishes the connection between management strategies and regional economic development in humid red bed regions of *** soil erosive modulus was calculated in the Nanxiong Basin by using RUSLE(The Revised Universal Soil Loss Equation).The results of overlapping analyses demonstrated that appropriate measures,such as the Return Farmland to Forests initiative,should be taken at the junction of central red bed areas and mountainous areas in order to mitigate current soil *** examples are presented to demonstrate this:the tourism development in ***,a noted scenic mountainous area near Nanxiong Basin,and the land degradation mitigation in the Nanxiong *** examples promote local economic growth while simultaneously protecting the environment.A‘stakeholder'strategy is pursued at ***,which can help residents to understand their positive effects on the environment as well as increase their *** second example,in Nanxiong City,showcases how local farmers became stakeholders by implementing contract responsibility and self-support systems for economic forests and terraced land in the 1980s.

关键词： Red beds Land degradation Desertification Danxia landform Management

A uniform solution to the independent set problem through tissue P systems with cell separation

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Frontiers of Computer Science 2012年第4期6卷 477-488页

作者： Xingyi ZHANG Xiangxiang ZENG bin luo Zheng ZHANG Key Laboratory of Intelligent Computing and Signal Processing of Ministry of Education School of Computer Science and TechnologyAnhui UniversityHefei 230039China Department of Computer Science Xiamen UniversityXiamen 361005China Key Laboratory of Image Processing and Intelligent Control Department of Control Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Membrane computing is an emergent branch of natural computing, which is inspired by the structure and the functioning of living cells, as well as the organization of cells in tissues, organs, and other higher order structures. Tissue P systems are a class of the most investigated computing mod- els in the framework of membrane computing, especially in the aspect of efficiency. To generate an exponential resource in a polynomial time, cell separation is incorporated into such systems, thus obtaining so called tissue P systems with cell separation. In this work, we exploit the computational efficiency of this model and construct a uniform family of such tissue P systems for solving the independent set problem, a well-known NP-complete problem, by which an efficient so- lution can be obtained in polynomial time.

关键词： membrane computing tissue P system cell sep- aration independent set problem

Natural Feature-based Visual Servoing for Grasping Target with an Aerial Manipulator

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Journal of Bionic Engineering 2020年第2期17卷 215-228页

作者： bin luo Haoyao Chen Fengyu Quan Shiwu Zhang Yunhui Liu School of Mechanical Engineering and Automation Harbin Institute of Technology ShenzhenShenzhen 518055China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China Department of Mechanical and Automation Engineering Chinese University of Hong KongHong Kong 999077China

Aerial transportation and manipulation have attracted increasing attention in the unmanned aerial vehicle field,and visual servoing methodology is widely used to achieve the autonomous aerial grasping of a target ***,the existing marker-based solutions pose a challenge to the practical application of target grasping owing to the difficulty in attaching markers on *** address this problem,this study proposes a novel image-based visual servoing controller based on natural features instead of artificial *** natural features are extracted from the target images and further processed to provide servoing feature points.A six degree-of-freedom(6-DoF)aerial manipulator system is proposed with differential kinematics deduced to achieve aerial ***,a controller is designed when the target object is outside a manipulator's workspace by utilizing both the degrees-of-freedom of nnmanned aerial vehicle and manipulator ***,a weight matrix is used as basis to develop a multi-tasking visual servoing framework to integrate the controllers inside and outside the manipulator's ***,experimental results are provided to verify the effectiveness of the proposed approach.

关键词： unmanned aerial manipulator visual servoing aerial grasping multi-tasking strategy

Effects of plant diversity on greenhouse gas emissions in microcosms simulating vertical constructed wetlands with high ammonium loading

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Journal of Environmental Sciences 2019年第3期31卷 229-237页

作者： Wenjuan Han Guiying luo bin luo Chenchen Yu Hai Wang Jie Chang Ying Ge College of Life Sciences Zhejiang University College of Chemistry and Life Sciences Zhejiang Normal University College of Life Sciences Shaoxing University

Wastewater with relatively high nitrogen concentrations is a major source of nitrous oxide(N_2O) and methane(CH_4) emissions and exerts multiple stresses on the *** have shown that plant diversity plays an important role in ecosystem ***, the effects of plant species diversity on CH_4 and N_2O emissions under high ammonium(NH_4^+-N) loading rates remain unclear. In this study, a microcosm experiment simulating vertical constructed wetlands supplied with high NH_4^+-N water levels was established. The treatments included four species richness levels(1, 2, 3, 4) and 15 species compositions. There was no significant relationship between species richness and N_2O emissions. However, N_2O emissions were significantly reduced by specific plant species composition. Notably, the communities with the presence of Rumex japonicus L. reduced N_2O emissions by 62% compared to communities without this species. This reduction in N_2O emissions may have been a result of decreased N concentrations and increased plant biomass. CH_4 emissions did not respond to plant species richness or species ***, plant species identity surpassed species richness in lowering N_2O emissions from constructed wetlands with high NH_4^+-N water. The results also suggest that communities with R. japonicus could achieve higher N removal and lower greenhouse gas emissions than other wetland species.

关键词： Plant species richness Species identity Methane Nitrous oxide Nitrogen removal Ecosystem functioning

A modular parallelization framework for power flow transfer analysis of large-scale power systems

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 679-690页

作者： Chuntian CHENG bin luo Jianjian SHEN Shengli LIAO Institute of Hydropower System and Hydroinformatics Dalian University of Technology Tsinghua Sichuan Energy Internet Research Institute

Power flow transfer(PFT) analysis under various anticipated faults in advance is important for securing power system operations. In China, PSD-BPA software is the most widely used tool for power system analysis, but its input/output interface is easily adapted for PFT analysis,which is also difficult due to its computationally *** solve this issue, and achieve a fast and accurate PFT analysis, a modular parallelization framework is developed in this paper. Two major contributions are included. One is several integrated PFT analysis modules, including parameter initialization, fault setting, network integrity detection, reasonableness identification and result *** other is a parallelization technique for enhancing computation efficiency using a Fork/Join framework. The proposed framework has been tested and validated by the IEEE 39 bus reference power system. Furthermore, it has been applied to a practical power network with 11052 buses and 12487 branches in the Yunnan Power Grid ofChina, providing decision support for large-scale power system analysis.

关键词： Power flow transfer Modular Parallelization Fork/Join framework PSD-BPA

Approaches to Census Mapping:Chinese Solution in 2010 Rounded Census

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Chinese Geographical Science 2012年第3期22卷 356-366页

作者： WANG Yingjie LI Hongsheng YU Zhuoyuan luo bin State Key Laboratory of Resources and Environmental Information System Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

China still use sketch maps as control devices that guarantees consistency and accuracy of population counting in previous *** the rapid advancement of geospatial technologies provides many possible solutions of digital census mapping,existing researches do not answer which solution is suitable to *** to many constraints originated from characteristics of China,a practical solution of census mapping based on remote sensing imagery and auxiliary geographic information was proposed and proved to be feasible through evaluation analysis and a three-stage pilot *** with 2.5 meters and higher resolution,innovative workflow of census areas delineation,easy-to-use census mapping software packages and training organization all together provide the all-around supports for the 2010 rounded census (the 6th census) mapping activities.A digital census geographic framework detailed at the level of enumeration area was established in the 2010 rounded census which fills in the gaps in the field of modern geospatial census in *** spatially referenced digital census database,especially the detailed census units,is of great value in successive census,sampling survey and many other census-related *** work including quality evaluation of census areas,census mapping solution in the Tibet Autonomous Region are also discussed.

关键词： 6th census census mapping Chinese solution geographic information system remote sensing