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Numerical analyses of coupled thermo-mechanical behaviors of cement sheath in geothermal wells

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Underground Space 2023年第1期8卷 80-93页

作者： Hao wang jinlin wang Zhichao Zhang Xiaohui Cheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of TechnologyDalian 116024China School of Civil Engineering Chongqing UniversityChongqing 400045China Department of Civil Engineering Tsinghua UniversityBeijing 10084China

The stability of cement sheath under high temperature and high pressure is one of the most critical issues for the durability of geother-mal well *** this study,a two-dimensional plane-strain finite element code was developed to investigate the coupled thermo-mechanical behaviors of the casing-cement-formation *** from previous linear elastic analyses,a thermoelasto-plastic con-stitutive model based on the thermodynamic theory was adopted for the cement *** is shown that the finite element simulations using the proposed model provide a more accurate and realistic prediction of stress–strain responses of the cement sheath under high *** results demonstrate that the radial stress concentration and the tensile strain concentration occur at both the cement–casing interface and the cement–formation interface,where the cement sheath is most likely to *** strength and low stiff-ness in the cement sheath and the formation are preferred for the integrity of the *** large thermal cycles and large differences between the internal fluid pressure and the external pressure should be avoided during *** new code is an alternative tool for guiding the geothermal well *** finite element framework described herein is universal for other thermo-mechanical applications,such as energy foundations and energy tunnels.

关键词： Geothermal well Thermal-mechanical coupling Finite element analysis Constitutive model Cement sheath Thermodynamic theory

Network address translation traversal based on Bernoulli laws of large number in P2P streaming system

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High Technology Letters 2011年第4期17卷 401-406页

作者： Ren Hao wang jinlin National Network New Media Engineering ＆ Technology Research Center Institute of Acoustics Chinese Academy of Sciences Beijing 100190 P.R.China Graduate University of Chinese Academy of Sciences Beijing 100190 P.R.China State Nuclear Power software Development Center Beijing 100029 P. R. China

P2P streaming application must realize network address translation （NAT） traversal. To handle low success ratio of the existing NAT traversal algorithm, UPnP-STUN （UPUN） and port-mapping sample estimation （PMSE） algorithm are recommended in this paper. UPUN is the combination of UPnP and STUN, and PMSE utilizes port mapping samples added by symmetric NAT for different sessions to estimate regularity of port mapping of symmetric NAT, which takes advantage of the Bernoulli law of large numbers. Besides, for the situation that both peers are behind NAT, and to handle heavy relay server load when many inner peers want to communicate with each other, a peer auxiliary-relay （PAR） algorithm is presented. PAR lets outer peers with sufficient bandwidth act as relay servers to alleviate pressure of real server, which could avoid NAT traversal failure caused by single point failure of relay server. Finally, experiments show that the proposed algorithms could improve the success ratio significantly for NAT traversal in P2P streaming application as well as improve P2P streaming application applicability.

关键词： network address translation(NAT) traversal sample estimation auxiliary-relay P2P streaming

Memory Copy Optimization for Streaming Gateway Transcoding:Models and Algorithms

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Chinese Journal of Electronics 2016年第4期25卷 734-739页

作者： LI Mingzhe wang jinlin CHEN Xiao YE Xiaozhou National Network New Media Engineering Research Center Institute of AcousticsChinese Academy of Sciences University of Chinese Academy of Sciences

Repeated memory copy during protocol translation inhibits capacity of a streaming media *** existing optimization techniques that rely on platform-specific features,this paper investigates algorithm-level platform-independent strategies.A mathematical concept of the buf-string is proposed to model the protocol transcoding *** on this model three payload extraction algorithms that can reduce memory copy are *** streaming gateway used in the Next-generation broadcasting(NGB) and the Nextgeneration on-demand(NGOD) system is taken as an example to demonstrate and evaluate our *** results from an x86 host and an embedded system prove that our strategies can reduce CPU overhead by 15%to 45%,and optimize the linear space complexity to a constant one.

关键词： Streaming media Gateway Memory copy Automata Pattern matching

Peer priority based data scheduling algorithm in P2P streaming system

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High Technology Letters 2013年第2期19卷 208-213页

作者：任浩 wang jinlin You Jiali National Network New Media Engineering Research Center Institute of AcousticsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences State Nuclear Power Software Development Center

In order to solve the problem that the existing data scheduling algorithm cannot make full use of neighbors' bandwidth resources when allocating data request among several senders in the multisender based P2P streaming system,a peer priority based scheduling algorithm is *** algorithm calculates neighbors' priority based on peers' historical service evaluation as well as how many wanted data that the neighbor *** data request allocated to each neighbor is adjusted dynamically according to the priority when *** with high priority are preferred to allocate more data *** shows the algorithm can make full use of neighbors' bandwidth resources to transmit data to reduce server pressure effectively and improve system scalability.

关键词： peer-to-peer (P2P) streaming data scheduling priority request allocation

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Benefiting from providing multi-dimensional view of peers in overlay of P2P streaming system

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High Technology Letters 2013年第2期19卷 214-220页

作者：苏杭 wang jinlin You Jiali Graduate University of Chinese Academy of Sciences National Network New Media Engineering Research Center Institute of AcousticsChinese Academy of Sciences

Most overlay of existing P2P streaming systems just focus on the view point of video content *** multi-dimensional overlay for the P2P streaming system(MDOPS) is proposed for providing multi-dimensional view including video data,peers' service capability and online stability based on locality sensitive *** organizes all Live/VoD peers and the above multi-dimensional information in a one-dimensinal DHT,uses range resource information publish/search and introduces multiple load balancing *** maintains an additional candidate coordinating peer list with high qualified peers who own the video data the peer would possibly access currently and in *** list could speed up the process of searching peers for data scheduling *** experiment based on trace of real streaming system has testified that MDOPS can effectively improve the quality of search results and smooth load distribution among peers without increasing the cost of resource publish/search.

关键词： Peer-to-Peer (P'2P) streaming overlay locality sensitive hashing rangesearch load balance

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Application of cluster analysis to geochemical compositional data for identifying ore-related geochemical anomalies

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Frontiers of Earth Science 2018年第3期12卷 491-505页

作者： Shuguang ZHOU Kefa ZHOU jinlin wang Genfang YANG Shanshan wang Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Xinjiang Laboratory of Mineral Resources and Digital Geology Ummqi 830011 China Laboratory of Desert Environment & Engineering Ummqi 830011 China

Cluster analysis is a well-known technique that is used to analyze various types of data. In this study, cluster analysis is applied to geochemical data that describe 1444 stream sediment samples collected in northwestern Xinjiang with a sample spacing of approximately 2 km. Three algorithms （the hierarchical, k-means, and fuzzy cmeans algorithms） and six data transformation methods （the z-score standardization, ZST; the logarithmic transformation, LT; the additive log-ratio transformation, ALT; the centered log-ratio transformation, CLT; the isometric log-ratio transformation, ILT; and no transformation, NT） are compared in terms of their effects on the cluster analysis of the geochemical compositional data. The study shows that, on the one hand, the ZST does not affect the results of columnor variable-based （R-type） cluster analysis, whereas the other methods, including the LT, the ALT, and the CLT, have substantial effects on the results. On the other hand, the results of the row- or observation-based （Q-type） cluster analysis obtained from the geochemical data after applying NT and the ZST are relatively poor. However, we derive some improved results from the geochemical data after applying the CLT, the ILT, the LT, and the ALT. Moreover, the k-means and fuzzy cmeans clustering algorithms are more reliable than the hierarchical algorithm when they are used to cluster the geochemical data. We apply cluster analysis to the geochemical data to explore for Au deposits within the study area, and we obtain a good correlation between the results retrieved by combining the CLT or the ILT with the k-means or fuzzy c-means algorithms and the potential zones of Au mineralization. Therefore, we suggest that the combination of the CLT or the ILT with the k-means or fuzzy c-means algorithms is an effective tool to identify potential zones of mineralization from geochemical data.

关键词： cluster analysis compositional data geochemical anomaly mineral exploration

A Review of Data Cleaning Methods for Web Information System

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Computers, Materials & Continua 2020年第3期62卷 1053-1075页

作者： jinlin wang Xing wang Yuchen Yang Hongli Zhang Binxing Fang School of Computer Science and Technology Harbin Institute of TechnologyHarbin150006China

Web information system(WIS)is frequently-used and indispensable in daily social *** provides information services in many scenarios,such as electronic commerce,communities,and *** cleaning plays an essential role in various WIS scenarios to improve the quality of data *** this paper,we present a review of the state-of-the-art methods for data cleaning in *** to the characteristics of data cleaning,we extract the critical elements of WIS,such as interactive objects,application scenarios,and core technology,to classify the existing ***,after elaborating and analyzing each category,we summarize the descriptions and challenges of data cleaning methods with sub-elements such as data&user interaction,data quality rule,model,crowdsourcing,and privacy ***,we analyze various types of problems and provide suggestions for future research on data cleaning in WIS from the technology and interactive perspective.

关键词： Data cleaning web information system data quality rule crowdsourcing privacy preservation

Intelligent outdoor video advertisement recommendation system based on analysis of audiences' characteristics

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High Technology Letters 2016年第2期22卷 215-223页

作者：刘鹏 Li Songbin Deng Haojiang wang jinlin Haikou Laboratory Institute of AcousticsChinese Academy of Sciences National Network New Media Engineering Research Center Institute of AcousticsChinese Academy of Sciences

An integrated implementation framework of an intelligent recommendation system for outdoor video advertising is proposed, which is based on the analysis of audiences＇ characteristics. Firstly, the images of the scene and the people who view the video advertisements are captured by the net- work camera deployed on the video advertising terminal side. Then audiences＇ characteristics can be obtained by applying computer vision technologies ： face detection, face tracking, gender recogni- tion and age estimation. Finally, an intelligent recommendation algorithm is designed to decide the most fitting video ads for each terminal according to multi-dimensional statistical information of its reover, a novel face detection method and a new face tracking method have been proposed to meet the practical requirements of the system, of which the average Fl-score is O. 988 and 0. 951 respec- tively.

关键词： face detection face tracking intelligent recommendation system outdoor videoadvertisement

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Information Classification and Extraction on Official Web Pages of Organizations

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Computers, Materials & Continua 2020年第9期64卷 2057-2073页

作者： jinlin wang Xing wang Hongli Zhang Binxing Fang Yuchen Yang Jianan Liu School of Computer Science and Technology Harbin Institute of TechnologyHarbin150006China China Electronic Equipment System Engineering Company Beijing100039China

As a real-time and authoritative source,the official Web pages of organizations contain a large amount of *** diversity of Web content and format makes it essential for pre-processing to get the unified attributed data,which has the value of organizational analysis and *** existing research on dealing with multiple Web scenarios and accuracy performance is *** paper aims to propose a method to transform organizational official Web pages into the data with *** locating the active blocks in the Web pages,the structural and content features are proposed to classify information with the specific *** extraction methods based on trigger lexicon and LSTM(Long Short-Term Memory)are proposed,which efficiently process the classified information and extract data that matches the ***,an accurate and efficient method to classify and extract information from organizational official Web pages is *** results show that our approach improves the performing indicators and exceeds the level of state of the art on real data set from organizational official Web pages.

关键词： Web pre-process feature classification data extraction trigger lexicon LSTM