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Heptavalent Symmetric Graphs of Order 16p

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Algebra Colloquium 2017年第3期24卷 453-466页

作者： Songtao Guo hailong Hou Yong Xu School of Mathematics and Statistics Henan University of Science and Technology Luoyang Henan 471023 China

A graph is symmetric if its automorphism group acts transitively on the set of arcs of the graph. We classify connected heptavalent symmetric graphs of order 16p for each prime p. As a result, there are two such sporadic graphs with p=3 and 7, and an infinite family of 1-regular normal Cayley graphs on the group Z23 × D2p with 7｜（p - 1）.

关键词： symmetric graph s-transitive graph Cayley graph

Integral cryptanalysis of SPN ciphers with binary permutations

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Science China(Information Sciences) 2018年第1期61卷 276-278页

作者： hailong SONG Yuechuan WEI School of Information Science and Engineering Central South University School of Information Science and Engineering Jishou University Electronics Technology Department Engineering University of Armed Police Force

Dear editor,As one of the most powerful cryptanalytic vectors,integral cryptanalysis[1]exploits the simultaneous relationship between multiple ***[1],the integral of f(x)over some subset V(V is not necessarily but oft... 详细信息

关键词： PT SPN Fn

Mainlobe jamming suppression via improved BSS method for rotated array radar

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Journal of Systems Engineering and Electronics 2022年第6期33卷 1151-1158页

作者： ZHANG hailong ZHANG Gong XUE Biao YUAN Jiawen Key Laboratory of Radar Imaging and Microwave Photonics Ministry of EducationNanjing University of Aeronautics and AstronauticsNanjing 210016China Nanjing Marine Radar Institute Nanjing 211153China

This study deals with the problem of mainlobe jamming suppression for rotated array *** interference becomes spatially nonstationary while the radar array rotates,which causes the mismatch between the weight and the snapshots and thus the loss of target signal to noise ratio(SNR)of pulse *** this paper,we explore the spatial divergence of interference sources and consider the rotated array radar anti-mainlobe jamming problem as a generalized rotated array mixed signal(RAMS)model *** the corresponding algorithm improved blind source separation(BSS)using the frequency domain of robust principal component analysis(FDRPCA-BSS)is proposed based on the established rotating *** can eliminate the influence of the rotating parts and address the problem of loss of ***,the measured peakto-average power ratio(PAPR)of each separated channel is performed to identify the target echo channel among the separated *** results show that the proposed method is practically feasible and can suppress the mainlobe jamming with lower loss of SNR.

关键词： mainlobe jamming blind signal separation(BSS) robust principal component analysis(RPCA) peak to average power ratio(PAPR)

Effects of Kuroshio intrusion optimization on the simulation of mesoscale eddies in the northern South China Sea

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Acta Oceanologica Sinica 2020年第3期39卷 12-24页

作者： Baoxin Feng hailong Liu Pengfei Lin College of Ocean and Meteorology Guangdong Ocean UniversityZhanjiang 524000China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

The impacts of Kuroshio intrusion(KI) optimization on the simulation of meso-scale eddies(MEs) in the northern South China Sea(SCS) were investigated based on an eddy-resolving ocean general circulation model by comparing two numerical experiments with differences in their form and intensity of KI due to the optimizing topography at Luzon Strait(LS). We found that a reduced KI reduces ME activities in the northern SCS, which is similar to the observations. In this case, the biases of the model related to simulating the eddy kinetic energy(EKE) west of the LS and along the northern slope are remarkably attenuated. The reduced EKE modeling bias is associated with both the reduced number of anti-cyclonic eddies(AEs) and the reduced amplitude of cyclonic eddies(CEs). The EKE budget analysis further suggests that the optimization of the KI will change the EKE by changing the horizontal velocity shear and the slope of the thermocline, which are related to barotropic and baroclinic instabilities, respectively. The former plays the key role in regulating the EKE in the northern SCS due to the changing of the KI. The EKE advection caused by the KI is also important for the EKE budget to the west of the LS.

关键词： South China Sea meso-scale eddy Kuroshio intrusion Luzon Strait

Eastern equatorial Pacific SST seasonal cycle in global climate models: from CMIP5 to CMIP6

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Acta Oceanologica Sinica 2020年第7期39卷 50-60页

作者： Zhenya Song hailong Liu Xingrong Chen First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China School of Oceanography Shanghai Jiaotong UniversityShanghai 200240China National Marine Environmental Forecasting Center Ministry of Natural ResourcesBeijing 100081China

The sea surface temperature(SST)seasonal cycle in the eastern equatorial Pacific(EEP)plays an important role in the El Nino–Southern Oscillation(ENSO)***,the reasonable simulation of SST seasonal cycle in the EEP is still a challenge for climate *** this paper,we evaluated the performance of 17 CMIP6 climate models in simulating the seasonal cycle in the EEP and compared them with 43 CMIP5 climate *** general,only CESM2 and SAM0-UNICON are able to successfully capture the annual mean SST characteristics,and the results showed that CMIP6 models have no fundamental improvement in the model annual mean *** the seasonal cycle,14 out of 17 climate models are able to represent the major characteristics of the observed SST annual *** spring,12 models capture the 1–2 months leading the eastern equatorial Pacific region 1(EP1;5°S–5°N,110°–85°W)against the eastern equatorial Pacific region 2(EP2;5°S–5°N,140°–110°W).In autumn,only two models,GISS-E2-G and SAM0-UNICON,correctly show that the EP1 and EP2 SSTs vary in *** the CMIP6 MME SST simulation in EP1,both the cold bias along the equator in the warm phase and the warm bias in the cold phase lead to a weaker annual SST cycle in the CGCMs,which is similar to the CMIP5 ***,both the seasonal cold bias and warm bias are considerably decreased for CMIP6,which leads the annual SST cycle to more closely reflect the *** the CMIP6 MME SST simulation in EP2,the amplitude is similar to the observed value due to the quasi-constant cold bias throughout the year,although the cold bias is clearly improved after August compared with CMIP5 ***,although SAM0-UNICON successfully captured the seasonal cycle characteristics in the EEP and the improvement from CMIP5 to CMIP6 in simulating EEP SST is clear,the fundamental climate models simulated biases still exist.

关键词： CMIP5 CMIP6 eastern equatorial Pacific SST seasonal cycle

Numerical Study of Gas Production from a Methane Hydrate Reservoir Using Depressurization with Multi-wells

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Acta Geologica Sinica(English Edition) 2021年第3期95卷 928-936页

作者： SHANG Shilong GU Lijuan LU hailong College of Engineering Peking UniversityBeijing 100871China School of Earth and Space Sciences Peking UniversityBeijing 100871China Beijing International Center for Gas Hydrate Peking UniversityBeijing 100871China

With the implementation of the production tests in permafrost and offshore regions in Canada,US,Japan,and China,the study of natural gas hydrate has progressed into the stage of technology development for industrial *** depressurization method is considered as a better strategy to produce gas from hydrate reservoirs based on production tests and laboratory ***-well production is proposed to improve gas production efficiency,to meet the requirement for industrial *** evaluating the applicability of multi-well production to hydrate exploitation,a 2D model is established,with numerical simulations of the performance of the multi-well pattern carried *** understand the dissociation behavior of gas hydrate,the pressure and temperature distributions in the hydrate reservoir are specified,and the change in permeability of reservoir sediments is *** results obtained indicate that multi-well production can improve the well connectivity,accelerate hydrate dissociation,enhance gas production rate and reduce water production as compared with single-well production.

关键词： oil and gas upstream unconventional resources natural gas hydrate numerical simulation depressurization

Model learning:a survey of foundations,tools and applications

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Frontiers of Computer Science 2021年第5期15卷 71-92页

作者： Shahbaz ALI hailong SUN Yongwang ZHAO Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing 100191China SKLSDE School of Computer Science and EngineeringBeihang UniversityBeijing 100191China School of Software Beihang UniversityBeijing 100191China School of Cyber Science and Technology College of Computer ScienceZhejiang UniversityHangzhou 310058China

Software systems are present all around us and playing their vital roles in our daily *** correct functioning of these systems is of prime *** addition to classical testing techniques,formal techniques like model checking are used to reinforce the quality and reliability of software ***,obtaining of behavior model,which is essential for model-based techniques,of unknown software systems is a challenging *** mitigate this problem,an emerging black-box analysis technique,called Model Learning,can be *** complements existing model-based testing and verification approaches by providing behavior models of blackbox systems fully *** paper surveys the model learning technique,which recently has attracted much attention from researchers,especially from the domains of testing and ***,we review the background and foundations of model learning,which form the basis of subsequent ***,we present some well-known model learning tools and provide their merits and shortcomings in the form of a comparison ***,we describe the successful applications of model learning in multidisciplinary fields,current challenges along with possible future works,and concluding remarks.

关键词： model learning active automata learning automata learning libraries/tools inferring behavior models testing and formal verification

Preface: Special Topics on Study Progress of Natural Gas Hydrate

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Acta Geologica Sinica(English Edition) 2022年第2期96卷 661-662页

作者： LU hailong HE Tao Beijing International Center for Gas Hydrate Peking UniversityBeijing 100871China

Natural gas hydrate is widely distributed in continental slope sediments and permafrost,taken as a potential energy resource due to its gigantic *** develop the technologies for the industrial exploitation of natural gas hydrate,several production tests were carried out in permafrost and marine hydrate reservoirs,*** in permafrost hydrate reservoirs in Mackenzie Delta and Alaskan North Slope(Boswell et al.,2017)in the Antarctic,and those in marine hydrate reservoirs in Nankai Trough,offshore Japan(Yamamoto et al.,2014,2018),and South China Sea(SCS)(Li et al.,2018;Ye et al.,2020).As encouraged by the results obtained from the production tests,more tests are planned to develop technology for industrial exploitation of natural gas hydrate(Collett et al.,2022).Although production test can be conducted in permafrost hydrate reservoir for cost efficiency,generally it is thought industrial exploitation will be realized in marine hydrate reservoir because it is estimated with over 90%of hydrate resource.

关键词： reservoir reservoirs Mackenzie

Deep Unfitted Nitsche Method for Elliptic Interface Problems

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Communications in Computational Physics 2022年第4期31卷 1162-1179页

作者： hailong Guo Xu Yang School of Mathematics and Statistics The University of MelbourneParkvilleVIC 3010Australia Department of Mathematics University of CaliforniaSanta BarbaraCA93106USA

This paper proposes a deep unfitted Nitsche method for solving elliptic interface problems with high contrasts in high *** capture discontinuities of the solution caused by interfaces,we reformulate the problem as an energy minimization problem involving two weakly coupled *** enables us to train two deep neural networks to represent two components of the solution in highdimensional *** curse of dimensionality is alleviated by using theMonte-Carlo method to discretize the unfittedNitsche energy *** present several numerical examples to show the performance of the proposed method.

关键词： Deep learning unfitted Nitsche method interface problem deep neural network