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Linear-fitting-based recursive filtering for nonlinear systems under encoding-decoding mechanism

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Science China(Information Sciences) 2024年第5期67卷 183-196页

作者： Bo JIANG Hongli DONG Zhiwei GAO Yuxuan SHEN Fan YANG Artificial Intelligence Energy Research institute Northeast Petroleum University Heilongjiang Provincial Key Laboratory of Networking and Intelligent Control Sanya Offshore Oil & Gas Research institute Northeast Petroleum University School of Electrical & Information Engineering Northeast Petroleum University

This paper deals with a recursive filtering problem for a class of discrete time-varying nonlinear networked systems with the encoding-decoding mechanism. The linear fitting method is introduced to handle the nonlinearity. An encoding-decoding mechanism is constructed to describe the data transmission process in wireless communication networks(WCNs). To be specific, the measurement outputs are mapped by a quantizer to unique codewords for transmission in WCNs. Then, the codewords are decoded by the decoder to recover the measurement outputs which are sent to the filter. The processing/encoding delay and network delay have been considered. Firstly, on the premise that the upper bound of the filtering error covariance is minimum, the appropriate filtering gain is calculated. Then, the mean square exponential boundedness of the filtering error is analyzed. Finally, two simulation examples are presented to verify the effectiveness of the proposed algorithm.

关键词： encoding-decoding mechanism uniform quantizer linear fitting networked systems recursive filtering

Housing vacancy identification in shrinking cities based on multi-source data:A case study of Fushun city in northeast China

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Journal of Geographical Sciences 2024年第1期34卷 89-111页

作者： SUN Hongri ZHOU Guolei LIU Yanjun FU Hui JIN Yu School of Geographical Sciences Northeast Normal UniversityChangchun 130024China northeast institute of Geography and Agroecology CASChangchun 130102China

Urban shrinkage has attracted the attention of many geographers and urban planners in recent ***,there are fewer studies on vacant housing in shrinking ***,this study combines multi-source remote sensing images and urban building data to assess the spatiotemporal variation patterns of housing vacancy in a typical shrinking city in *** following points were obtained:(1)We developed an evaluation model to identify vacant residential buildings in shrinking cities by removing the contribution of nighttime lights from roads and non-residential buildings;(2)The residential building vacancy rate in Fushun city significantly increased from 2013 to 2020,resulting in a significant high-value clustering *** impact of urban shrinkage on vacant residential buildings was higher than that on vacant non-residential buildings;(3)The World Pop population data demonstrated consistent spatial distribution and trend of population change in Fushun with the residential building vacancy rate results,suggesting good reliability of the constructed evaluation model in this *** housing vacancies can help the local government to raise awareness of the housing vacancy problem in shrinking cities and to propose reasonable renewal strategies.

关键词： housing vacancy residential building vacancy urban shrinkage VIIRS

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中日韩合作的发展、困境与前景（英文）

China International studies 2024年第2期 41-68+2页

作者：巴殿君左天全 the Center for northeast asian studies Jilin University the institute for northeast asian studies Jilin University

China-Japan-ROK cooperation has witnessed significant progress in both depth and breadth with a comprehensive and multi-dimensional architecture. Despite the multiple practical challenges, the three countries do not retrogress from their will and vision to strengthen regional cooperation. Peaceful coexistence among the trio and their joint efforts to promote regional economic development and cultural integration are consistent with the three sides' national interests and the broader region's demand. This is also a precondition for win-win cooperation in northeast Asia.

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中日韩合作的发展、困境与前景

China International studies 2024年第2期 41-68页

作者：巴殿君左天全 Center for northeast asian studies Jilin University institute for northeast asian studies Jilin University

China,Japan,and the Republic of Korea(ROK)are geographically adjacent countries with a major influence in East *** China-Japan-ROK trilateral cooperation mechanism,since its inception in 1999,has made important contributions to the development of the three countries,the prosperity of the broader region,and the world ***,global economic growth is faltering,the political landscape is beset with polarization,security issues are emerging in different regions on a more frequent basis,and the global industrial chain is undergoing a reconstruction.

关键词： landscape peace cooperation

Everyone Wins with China and Malaysia

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China Report ASEAN 2024年第6期9卷 60-62页

作者： Zhao Shulan the China(Kunming)institute for South asian and Southeast asian studies

China-Malaysia economic cooperation began in *** the last 50 years,direct investment and trade ties have been the heart of bilateral economic *** injecting continuous momentum to the two countries’economic developmen... 详细信息

关键词： investment cooperation Malaysia

Catechol-Formaldehyde Resin Coated CdS Core-Shell Composite as Robust Photocatalyst for Long-Term Sustainable Artificial Photosynthesis of H_(2)O_(2)

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Chinese Journal of Chemistry 2024年第17期42卷 1975-1985页

作者： Yuexin Xiang Zhinan Xia Wanchao Hu Cuiyan Tong Yang Xiao Changli Lu institute of Chemistry Northeast Normal UniversityChangchunJilin130024China

Catechol-formaldehyde resin(CFR)is very attractive for H_(2)O_(2) production via the catalytic ***,the H2O2 formation is accompanied by the oxidation of catechol groups to o-benzoquinone groups on CFR,which will cause irreversible damage to CFR and greatly limit its long-term stable catalytic ***,CdS/CFR composite photocatalyst with a core-shell structure was synthesized by hydrothermal *** photogenerated electrons of Cds are used as a powerful driving force for the reversible redox conversion between catechol groups and o-benzoquinone groups on the CFR.

关键词： Hydrogen peroxide Photocatalysis Catechol-formaldehyde resin Cds Core-shell structures Oxygen reduction reaction Charge transfer Heterogeneous catalysis

A real-time intelligent lithology identification method based on a dynamic felling strategy weighted random forest algorithm

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Petroleum Science 2024年第2期21卷 1135-1148页

作者： Tie Yan Rui Xu Shi-Hui Sun Zhao-Kai Hou Jin-Yu Feng School of Petroleum Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangChina Sanya Offshore Oil&Gas Research institute Northeast Petroleum UniversitySanya572025HainanChina

Real-time intelligent lithology identification while drilling is vital to realizing downhole closed-loop drilling. The complex and changeable geological environment in the drilling makes lithology identification face many challenges. This paper studies the problems of difficult feature information extraction,low precision of thin-layer identification and limited applicability of the model in intelligent lithologic identification. The author tries to improve the comprehensive performance of the lithology identification model from three aspects: data feature extraction, class balance, and model design. A new real-time intelligent lithology identification model of dynamic felling strategy weighted random forest algorithm(DFW-RF) is proposed. According to the feature selection results, gamma ray and 2 MHz phase resistivity are the logging while drilling(LWD) parameters that significantly influence lithology identification. The comprehensive performance of the DFW-RF lithology identification model has been verified in the application of 3 wells in different areas. By comparing the prediction results of five typical lithology identification algorithms, the DFW-RF model has a higher lithology identification accuracy rate and F1 score. This model improves the identification accuracy of thin-layer lithology and is effective and feasible in different geological environments. The DFW-RF model plays a truly efficient role in the realtime intelligent identification of lithologic information in closed-loop drilling and has greater applicability, which is worthy of being widely used in logging interpretation.

关键词： Intelligent drilling Closed-loop drilling Lithology identification Random forest algorithm Feature extraction

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岸田文雄力推“新时代现实主义外交”

Contemporary International Relations 2024年第1期34卷 48-53页

作者：樊小菊 the northeast asian studies CICIR

Japanese Prime Minister Fumio Kishida has officially designated 2023 as the year of realist diplomacy in a new era. In actual terms, the main focuses of Kishida's diplomacy in the current year are strengthening the US... 详细信息

关键词：田文 strengthening official

GEOSatDB:global civil earth observation satellite semantic database

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Big Earth Data 2024年第3期8卷 522-539页

作者： Ming Lin Meng Jin Juanzi Li Yuqi Bai Department of Earth System Science Institute for Global Change StudiesMinistry of Education Ecological Field Station for East Asian Migratory BirdsTsinghua UniversityBeijingChina Department of Computer Science and Technology Tsinghua UniversityBeijingChina Tsinghua Urban institute Tsinghua UniversityBeijingChina

Satellite remote sensing,characterized by extensive coverage,fre-quent revisits,and continuous monitoring,provides essential data support for addressing global *** the past six decades,thousands of Earth observation satellites and sensors have been deployed *** valuable Earth observation assets are contributed independently by various nations and organizations employing diverse *** poses a significant challenge in effectively discovering global Earth observation resources and realizing their full *** this paper,we describe the develop-ment of GEOSatDB,the most complete semantic database of civil Earth observation satellites developed based on a unified ontology model.A similarity matching method is used to integrate satellite information and a prompt strategy is used to extract unstructured sensor *** resulting semantic database contains 127,949 semantic statements for 2,340 remote sensing satellites and 1,021 observation *** global Earth observation capabil-ities of 195 countries worldwide have been analyzed in detail,and a concrete use case along with an associated query demonstration is *** database provides significant value in effectively facilitating the semantic understanding and sharing of Earth observa-tion resources.

关键词： Earth observation satellite sensor semantic representation information extraction