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An artificial-neural-network-based surrogate modeling workflow for reactive transport modeling

Petroleum Research 2022年第1期7卷 13-20页

作者： Yupeng Li Peng Lu guoyin zhang Beijing Research Center of EXPEC Advanced Research Center Aramco AsiaBeijingChina EXPEC Advanced Research Center Saudi AramcoDhahranSaudi Arabia China University of Petroleum QingdaoChina

Process-based reactive transport modeling(RTM)integrates thermodynamic and kinetically controlled fluid-rock interactions with fluid flow through porous media in the subsurface and surface *** is usually conducted through numerical programs based on the first principle of physical ***,the calculation for complex chemical reactions in most available programs is an iterative process,where each iteration is in general computationally intensive.A workflow of neural networkbased surrogate model as a proxy for process-based reactive transport simulation is established in this *** workflow includes(1)base case RTM design,(2)development of training experiments,(3)surrogate model construction based on machine learning,(4)surrogate model validation,and(5)prediction with the calibrated *** training experiments for surrogate modeling are generated and run prior to the predictions using *** results show that the predictions from the surrogate model agree well with those from processes-based RTM but with a significantly reduced computational *** well-trained surrogate model is especially useful when a large number of realizations are required,such as the sensitivity analysis or model calibration,which can significantly reduce the computational time compared to that required by *** benefits are(1)it automatizes the experimental design during the sensitivity analysis to get sufficient numbers and coverage of the training cases;(2)it parallelizes the calculations of RTM training cases during the sensitivity analysis to reduce the simulation time;(3)it uses the neural network algorithm to rank the sensitivity of the parameters and to search the optimal solution for model calibration.

关键词： Reactive transport modeling Surrogate model Machine learning Dolomitization Carbonate reservoir

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A Sub-pixel Disparity Refinement Algorithm Based on Lagrange Interpolation

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Chinese Journal of Electronics 2017年第4期26卷 784-789页

作者： MEN Yubo zhang guoyin MEN Chaoguang LI Xiang MA Ning College of Computer Science and Technology Harbin Engineering University Harbin Normal University

A sub-pixel disparity refinement algorithm based on Lagrange interpolation is proposed to calculate the sub-pixel disparity and the elevation of the target construction on the remote sensing image. The accurate integer matching feature points are obtained by improved affine scale invariant feature transform. A series of interpolation samples can be estimated through the three times magnification results of each feature matching point and its close neighbor pixels. The final sub-pixel deviation can be calculated by the interpolation samples. Experiment results show that a more accurate elevation information can be obtained on the remote sensing image with corrective epipolar line, and an accurate sub-pixel disparity result can be estimated without the epipolar line constraint as well.

关键词： Computer vision Remote sensing image processing Sub-pixel disparity Interpolation

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A Stereo Matching Algorithm Based on Four-Moded Census and Relative Confidence Plane Fitting

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Chinese Journal of Electronics 2015年第4期24卷 807-812页

作者： MEN Yubo zhang guoyin MEN Chaoguang LI Xiang MA Ning Collage of Computer Science and Technology Harbin Engineering University Harbin Commercial University

A four-moded Census transform stereo matching algorithm using bidirectional constraint dynamic programming and relative confidence plane fitting is proposed to solve the problems of matching quality. Using the four-moded Census transform which adds a restrictive condition replaces traditional Census transform to improve matching accuracy and mean value of all pixels intensity replaces the center pixel intensity in the Census window to solve the problem of the center pixel distortion effectively,a refined initial local matching cost can be obtained. During the disparity optimization, the difficulty of disparity computation in textureless areas is overcome by the estimated condition and defined relative confident pixels. Experiment results show that a better dense matching map can be obtained by the proposed algorithm.

关键词： Stereo matching Disparity estimation Census transform Plane fitting

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Offline/online attribute-based searchable encryption scheme from ideal lattices for IoT

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Frontiers of Computer Science 2024年第3期18卷 239-241页

作者： Yang YANG guoyin zhang Sizhao LI Zechao LIU College of Computer Science and Technology Harbin Engineering UniversityHarbin 150001China

1 Introduction The Internet of Things(IoT)has facilitated the development of numerous fields in our ***,some equipment in IoT environment lacks sufficient storage and data processing capabilities[1].A feasible strateg... 详细信息

关键词： IoT encryption scheme

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Lessons learned from coreflood experiments with surfactant-polymer and alkali-surfactant-polymer for enhanced oil recovery

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Petroleum 2023年第4期9卷 487-498页

作者： Ivan Kurnia Muhammad Fatchurrozi Riyaz Ghulam Anwary guoyin zhang Reservoir Engineering Research Group Institut Teknologi BandungIndonesia Petroleum Engineering Undergraduate Study Program Institut Teknologi BandungIndonesia Petroleum Recovery Research Center New Mexico TechUnited States

A review of coreflood experiments for chemically enhanced oil recovery(EOR)is presented in this paper,particularly surfactant-polymer(SP)and alkali-surfactant-polymer(ASP)*** objective of this review is to gain a general outlook and insight from coreflood experiments injecting SP or ASP slug as tertiary *** discussion is separated into sections based on relevant core and fluid properties as well as surfactant selection and SP/ASP slug design and their impact on incremental *** studies in this review have been published within the last twenty years but few older coreflood works have been included for *** in each reviewed study have been summarized in tables to help readers gain detailed *** learned from these past experiments should help other chemical EOR practitioners or students of the field in benchmarking or improving the outcomes of their future SP/ASP experiments.

关键词： Enhanced oil recovery Surfactant Polymer Alkali Coreflood

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350 μm map of the Ophiuchus molecular cloud: core mass function

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Science China(Physics,Mechanics & Astronomy) 2015年第2期58卷 114-124页

作者： zhang guoyin LI Di HYDE Ashley K QIAN Lei LYU HuaLei WU ZhongZu College of Science/Department of Physics Guizhou University Key Laboratory of Radio Astronomy Chinese Academy of Sciences National Astronomical Observatories Chinese Academy of Sciences Space Science Institute Department of Astronomy California Institute of Technology Astrophysics Group Imperial College London

Stars are born in dense cores of molecular clouds. The core mass function （CMF）, which is the mass distribution of dense cores, is important for understanding the stellar initial mass function （IMF）. We obtained 350μm dust continuum data using the SHARC-II camera at the Caltech Submillimeter Observatory （CSO） telescope. A 350μm map covering 0.25 deg2 of the Ophiuchus molecular cloud was created by mosaicing 56 separate scans. The CSO telescope had an angular resolution of 9＂, corresponding to 1.2 ×103 AU at the distance of the Ophiuchus molecular cloud （131 pc）. The data was reduced using the Comprehensive Reduction Utility for SHARC-II （CRUSH）. The flux density map was analyzed using the GaussClumps algorithm, within which 75 cores has been identified. We used the Spitzer c2d catalogs to separate the cores into 63 starless cores and 12 protostellar cores. By locating Jeans instabilities, 55 prestellar cores （a subcategory of starless cores） were also identified. The excitation temperatures, which were derived from FCRAO 12CO data, help to improve the accuracy of the masses of the cores. We adopted a Monte Carlo approach to analyze the CMF with two types of functional forms; power law and log-normal. The whole and prestellar CMF are both well fitted by a log-normal distribution, with p = -1. 18 ±0.10, σ = 0.58 ± 0.05 and μ= 1.40 ＋ 0.10, σ= 0.50 ＋ 0.05 respectively. This finding suggests that turbulence influences the evolution of the Ophiuchus molecular cloud.

关键词： 1SM molecular clouds Ophiuchus CMF

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A hydrothermal investigation system for the Qianlong-Ⅱ autonomous underwater vehicle

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Acta Oceanologica Sinica 2019年第3期38卷 159-165页

作者： Tao Wu Chunhui Tao Jinhui zhang Ao Wang guoyin zhang Jianping Zhou Xianming Deng Key Laboratory of Submarine Geosciences Second Institute of Oceanography Ministry of Natural Resources School of Oceanography Shanghai Jiaotong University Institute of Geophysics and Geomatics China University of Geosciences

Qianlong-Ⅱ is a fully autonomous underwater vehicle designed for the investigation of submarine resources,particularly polymetallic sulfides. It was used to successfully explore hydrothermal fields on the Southwest Indian Ridge. Here, we summarized the exploration of hydrothermal systems using Qianlong-Ⅱ, including detailed descriptions of its implementation along with the systems used for data management and fast mapping. We also introduced a method to remove platform magnetic interference using magnetic data while Qianlong-Ⅱ is spinning. Based on hydrothermal anomalies collected by Qianlong-Ⅱ, we developed a rapid method for locating hydrothermal vents. Taking one dive as an example, we systemically demonstrated the process for analyzing hydrothermal survey data to locate hydrothermal vents.

关键词： Qianlong-Ⅱ autonomous underwater vehicle data management hydrothermal investigation

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Use of portable X-ray fluorescence in the analysis of surficial sediments in the exploration of hydrothermal vents on the Southwest Indian Ridge

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Acta Oceanologica Sinica 2017年第7期36卷 66-76页

作者： LIAO Shili TAO Chunhui LI Huaiming zhang guoyin LIANG Jin YANG Weifang Second Institute of Oceanography State Oceanic AdministrationHangzhou 310012China Key Laboratory of Submarine Geosciences State Oceanic AdministrationHangzhou 310012China Key Laboratory of Marine Mineral Resources Ministry of Land and ResourcesGuangzhou 510075China

Hydrothermal plumes released from the eruption of sea floor hydrothermal fluids contain large amounts of oreforming materials. They precipitate within certain distances from the hydrothermal vent. Six surficial sediment samples from the Southwest Indian Ridge（SWIR） were analyzed by a portable X-ray fluorescence（PXRF） analyzer on board to find a favorable method fast and efficient enough for sea floor sulfide sediment geochemical exploration. These sediments were sampled near, at a moderate distance from, or far away from hydrothermal vents. The results demonstrate that the PXRF is effective in determining the enrichment characteristics of the oreforming elements in the calcareous sediments from the mid-ocean ridge. Sediment samples（〉40 mesh） have high levels of elemental copper, zinc, iron, and manganese, and levels of these elements in sediments finer than 40 mesh are lower and relatively stable. This may be due to relatively high levels of basalt debris/glass in the coarse sediments, which are consistent with the results obtained by microscopic observation. The results also show clear zoning of elements copper, zinc, arsenic, iron, and manganese in the surficial sediments around the hydrothermal vent. Sediments near the vent show relatively high content of the ore-forming elements and either high ratios of copper to iron content and zinc to iron content or high ratios of copper to manganese content and zinc to manganese content. These findings show that the content of the ore-forming elements in the sediments around hydrothermal vents are mainly influenced by the distance of sediments to the vent, rather than grain size. In this way, the PXRF analysis of surface sediment geochemistry is found to satisfy the requirements of recognition geochemical anomaly in mid-ocean ridge sediments. Sediments with diameters finer than 40 mesh should be used as analytical samples in the geochemical exploration for hydrothermal vents on mid-oceanic ridges. The results concerning co

关键词： mid-ocean ridge sediments hydrothermal activity portable X-ray fluorescence geochemical exploration

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The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge

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Acta Oceanologica Sinica 2018年第3期37卷 73-79页

作者： SUN Chaofeng WU Zhaocai TAO Chunhui RUAN Aiguo zhang guoyin GUO Zhikui HUANG Enxian Key Laboratory of Submarine Geosciences State Oceanic AdministrationHangzhou 310012China Second Institute of Oceanography State Oceanic AdministrationHangzhou 310012China Institute of Geophysics and Geomatics China University of OceanographyWuhan 430074China Henan Province Earthquake Administration Zhengzhou 450016China

Polymetalic sulfide is the main product of sea-floor hydrothermal venting, and has become an important sea-floor mineral resources for its rich in many kinds of precious metal elements. Since 2007, a number of investigations have been carried out by the China Ocean Mineral Resources Research and Development Association（COMRA）cruises（CCCs） along the Southwest Indian Ridge（SWIR）. In 2011, the COMRA signed an exploration contract of sea-floor polymetallic sulfides of 10 000 km2 on the SWIR with the International Seabed Authority. Based on the multibeam data and shipborne gravity data obtained in 2010 by the R/V Dayang Yihao during the leg 6 of CCCs21, together with the global satellite surveys, the characteristics of gravity anomalies are analyzed in the Duanqiao hydrothermal field（37°39′S, 50°24′E）. The ＂subarea calibration＂ terrain-correcting method is employed to calculate the Bouguer gravity anomaly, and the ocean bottom seismometer（OBS） profile is used to constrain the two-dimensional gravity anomaly simulation. The absent Moho in a previous seismic model is also *** results show that the crustal thickness varies between 3 and 10 km along the profile, and the maximum crustal thickness reaches up to 10 km in the Duanqiao hydrothermal field with an average of 7.5 km. It is by far the most thicker crust discovered along the SWIR. The calculated crust thickness at the Longqi hydrothermal field is approximately 3 km, 1 km less than that indicated by seismic models, possibly due to the outcome of an oceanic core complex（OCC）.

关键词： crustal thickness Duanqiao hydrothermal field gravity anomaly polymetallic sulfides Southwest Indian Ridge

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Attribute-Based Authenticated Group Key Management Protocol for Mobile Peer-to-Peer Network

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China Communications 2012年第10期9卷 68-77页

作者： zhang guoyin Fu Xiaojing Ma Chunguang College of Computer Science and Technology Harbin Engineering University Harbin 150001 P. R. China Network and Data Security Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu 611731 P. R. China

The authentication and privacy of a group member is important in multicast communication. This paper proposes a privacy-preserving authenticated group-key management protocol for the Mobile Peer-to-Peer Network （ MP2PN ）. The MP2PN contains some super peers and each super peer controls a subgroup composed of regular peers. An efficient attribute-based signature based on Cipertext-Policy Attribute-Based Encryption （CP-ABE） is proposed and used in this group-key rmnagement protocol to authenticate a peer＇s at- tributes and identity. A peer can be described by a set of attributes or one unique special identity at- tribute. Peers that have some attributes in common can form a group and conmmnicate with each other anonymously and securely. Any super peer can initiate a group and act as a group controller. The group controller can authenticate a peer＇s attributes and identity as well as remove malicious peers. Any peer with attributes that rmtches the access structure can join the group and provide its input to form the group key. The proposed protocol pro- vides backward and forward secrecy. The sinmlation results show that this protocol is applicable for mobile devices and can meet the MP2PN requirements of group communication.

关键词： MP2PN group key tmnagement attribute-based signature anonymous conmmnica tion

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