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Contrasts of bimodal tropical instability waves(TIWs)-induced wind stress perturbations in the Pacific Ocean among observations,ocean models,and coupled climate models

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Journal of Oceanology and Limnology 2024年第1期42卷 1-23页

作者： Kai MA Chuanyu LIU Junli XU Fan WANG school of mathematics and Physics Research Institute for Mathematics and Interdisciplinary SciencesQingdao University of Science and TechnologyQingdao 266100China Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Pilot National Laboratory for Marine Science and Technology(Qingdao) Qingdao 266237China

The coupling between wind stress perturbations and sea surface temperature(SST)perturbations induced by tropical instability waves(TIWs)in the Pacific Ocean has been revealed previously and proven crucial to both the atmosphere and ***,an overlooked fact by previous studies is that the loosely defined“TIWs”actually consist of two modes,including the Yanai wave-based TIW on the equator(hereafter eTIW)and the Rossby wave-based TIW off the equator(hereafter vTIW).Hence,the individual feedbacks of the wind stress to the bimodal TIWs remain *** this study,individual coupling relationships are established for both eTIW and v TIW,including the relationship between the TIW-induced SST perturbations and two components of wind stress perturbations,and the relationship between the TIW-induced wind stress perturbation divergence(curl)and the downwind(crosswind)TIW-induced SST *** show that,due to different distributions of eTIW and vTIW,the coupling strength induced by the eTIW is stronger on the equator,and that by the vTIW is stronger off the *** results of any of eTIW and vTIW are higher than those of the loosely defined *** further investigated how well the coupling relationships remained in several widely recognized oceanic general circulation models and fully coupled climate ***,the coupling relationships cannot be well represented in most numerical ***,we confirmed that higher resolution usually corresponds to more accurate ***,the coupling models established in this study are complementary to previous research and can be used to refine the oceanic and coupled climate models.

关键词： bimodal tropical instability waves mesoscale air-sea interaction coupled models Yanai wave

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Recursive Projected Filter Algorithm with Binary-Valued Observations

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Journal of Systems Science & Complexity 2024年第5期37卷 1832-1860页

作者： ZHANG Xiaoyan WANG Ying XUE Wenchao ZHAO Yanlong Key Laboratory of Systems and Control Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences school of Mathematical Sciences University of Chinese Academy of Sciences

This paper focuses on the state estimate for a class of systems with both process noise and measurement noise under binary-valued observations, in which the Gaussian assumption on the predicted density of the state is not required. A recursive projected filter algorithm with time-varying thresholds is constructed to estimate the state under binary-valued observations. The time-varying thresholds are designed as the prediction value of the measurement, which can provide more information about the system state. The convergence property is established with some suitable stability,boundedness and observability conditions. In particular, the estimation error between state and estimate is proved to be asymptotically bounded in the mean-square sense, whose upper bound is related to the variance of process noise. Finally, the theoretical results are demonstrated via numerical examples of first-order and high-order systems.

关键词： Binary-valued observations convergence recursive filter time-varying thresholds

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Blockchain-based immunization against kleptographic attacks

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Science China(Information Sciences) 2024年第7期67卷 172-183页

作者： Changsong JIANG Chunxiang XU Jie CHEN Kefei CHEN school of Computer Science and Engineering University of Electronic Science and Technology of China Yangtze Delta Region institute (Huzhou) University of Electronic Science and Technology of China Department of mathematics Hangzhou Normal University

Adversarial implementations of cryptographic primitives called kleptographic attacks cause the leakage of secret information. Subliminal channel attacks are one of the kleptographic attacks. In such attacks, backdoors are embedded in implementations of randomized algorithms to elaborately control randomness generation, such that the secrets will be leaked from biased outputs. To thwart subliminal channel attacks, double-splitting is a feasible solution, which splits the randomness generator of a randomized algorithm into two independent generators. In this paper, we instantiate double-splitting to propose a secure randomness generation algorithm dubbed SRG using two physically independent generators: ordinary and public randomness generators. Based on public blockchains, we construct the public randomness generator,which can be verified publicly. Hashes of a sufficient number of consecutive blocks that are newly confirmed on a blockchain are used to produce public randomness. In SRG, outputs from the two generators are taken as inputs of an immunization function. SRG accomplishes immunization against subliminal channel ***, we discuss the application strategies of SRG for symmetric and public-key encryption.

关键词： kleptographic attacks subliminal channel blockchain immunization randomized algorithm

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Joint training with local soft attention and dual cross-neighbor label smoothing for unsupervised person re-identification

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Computational Visual Media 2024年第3期10卷 543-558页

作者： Qing Han Longfei Li Weidong Min Qi Wang Qingpeng Zeng Shimiao Cui Jiongjin Chen school of mathematics and Computer Sciences Nanchang UniversityNanchang 330031China institute of Metaverse Nanchang UniversityNanchang 330031China Jiangxi Key Laboratory of Smart City Nanchang 330031China

Existing unsupervised person re-identification approaches fail to fully capture thefine-grained features of local regions,which can result in people with similar appearances and different identities being assigned the same label after *** identity-independent information contained in different local regions leads to different levels of local *** address these challenges,joint training with local soft attention and dual cross-neighbor label smoothing(DCLS)is proposed in this ***,the joint training is divided into global and local parts,whereby a soft attention mechanism is proposed for the local branch to accurately capture the subtle differences in local regions,which improves the ability of the re-identification model in identifying a person’s local significant ***,DCLS is designed to progressively mitigate label noise in different local *** DCLS uses global and local similarity metrics to semantically align the global and local regions of the person and further determines the proximity association between local regions through the cross information of neighboring regions,thereby achieving label smoothing of the global and local regions throughout the training *** extensive experiments,the proposed method outperformed existing methods under unsupervised settings on several standard person re-identification datasets.

关键词： person re-identification(Re-ID) unsupervised learning(USL) local soft attention joint training dual cross-neighbor label smoothing(DCLS)

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Research on Multi-Scale Feature Fusion Network Algorithm Based on Brain Tumor Medical Image Classification

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Computers, Materials & Continua 2024年第6期79卷 5313-5333页

作者： Yuting Zhou Xuemei Yang Junping Yin Shiqi Liu Graduate school China Academy of Engineering PhysicsBeijing100000China Department of Computational mathematics Beijing Institute of Applied Physics and Computational MathematicsBeijing100000China National Key Laboratory of Computational Physics Beijing100088China Shanghai Zhangjiang institute of mathematics Shanghai201203China

Gliomas have the highest mortality rate of all brain *** classifying the glioma risk period can help doctors make reasonable treatment plans and improve patients’survival *** paper proposes a hierarchical multi-scale attention feature fusion medical image classification network(HMAC-Net),which effectively combines global features and local *** network framework consists of three parallel layers:The global feature extraction layer,the local feature extraction layer,and the multi-scale feature fusion layer.A linear sparse attention mechanism is designed in the global feature extraction layer to reduce information *** the local feature extraction layer,a bilateral local attention mechanism is introduced to improve the extraction of relevant information between adjacent *** the multi-scale feature fusion layer,a channel fusion block combining convolutional attention mechanism and residual inverse multi-layer perceptron is proposed to prevent gradient disappearance and network degradation and improve feature representation *** double-branch iterative multi-scale classification block is used to improve the classification *** the brain glioma risk grading dataset,the results of the ablation experiment and comparison experiment show that the proposed HMAC-Net has the best performance in both qualitative analysis of heat maps and quantitative analysis of evaluation *** the dataset of skin cancer classification,the generalization experiment results show that the proposed HMAC-Net has a good generalization effect.

关键词： Medical image classification feature fusion transformer

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Laguerre Series Expansion for Scale Functions and Its Applications in Risk Theory

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Acta Mathematicae Applicatae Sinica 2024年

作者： Jia-yi XIE Zhen-yu CUI Zhi-min ZHANG school of Business Stevens Institute of Technology College of mathematics Science Chongqing Normal University College of mathematics and Statistics Chongqing University

We propose an exact explicit closed-form Laguerre series expansion formula to compute the q-scale function of a spectrally negative L′evy process (SNLP), and other functions associated to the scale function for the first time. The proposed closed-form formula for the scale function has many applications in applied probability and in particular in the Le′vy insurance risk theory. We shall show that the new series expansion formulas can be used to express the expected discounted penalty functions, the moments of the present value of total dividend payments as well as the time value of Parisian ruin in the L′evy risk models.

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Climbing the Export Quality Ladder:Role of Human Capital

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China & World Economy 2024年第2期32卷 125-159页

作者： Xiaogang He Ruifeng Teng Dawei Feng school of Applied Economics Jiangxi University of Finance and EconomicsChina

This study assesses the effect of human capital expansion on China's export product *** employs the difference-in-differences(DID)framework based on a quasi-natural experiment investigating the 1999 higher education enrollment expansion as the exogenous policy *** empirical results confirm that human capital expansion appreciably improved the quality of China's export *** capital expansion promoted the transformation and upgrading of old products and the development of new products in term of intensive margin;it strengthened the endowment advantages of incumbent high-quality export enterprises while preventing low-quality enterprises from entering the market through price competition on the extensive *** prevented quality ***,the study reveals that the improvement effect driven by human capital came from both innovation-induced and managerial efficiency improvement channels and was more prominent for large or foreign-funded enterprises in the eastern *** findings highlight the role of human capital in China's remarkable export performance from an endogenous growth perspective.

关键词： endogenous growth export product higher education expansion human capital quality improvement

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Import Policy Uncertainty and Innovation

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China & World Economy 2024年第1期32卷 197-230页

作者： Lingshan Chen Yunong Li Qian Xie Mao Zhou school of International Business Southwestern University of Finance and Economics(SWUFE)China school of International Business SWUFEChina institute of Economics Chinese Academy of Social SciencesChina

The Chinese government has emphasized innovation as the primary driving force for economic development in the new *** paper studies the effect of import policy uncertainty(IPU)on the innovation activity of Chinese manufacturing *** establishes a simple model to show that the presence of IPU encourages innovation and that a reduction in IPU discourages *** distinguishes the almost unnoticed IPU reduction from tariff reduction on China's WTO accession and develops a novel difference-in-differences specification that identifies the negative effect of IPU reduction on innovation using updated data for Chinese manufacturing and patent *** result holds after a battery of identification assumptions and robustness checks are *** import channel explains about two thirds of the effect of IPU on innovation,but not all of the ***,this paper examines the effect across firms of different levels of productivity and ownership types and patents of different categories.

关键词： import policy uncertainty innovation patent WTO

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Set Stabilization of Large-Scale Stochastic Boolean Networks:A Distributed Control Strategy

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 806-808页

作者： Lin Lin Jinde Cao Jianquan Lu Leszek Rutkowski the Department of Mechanical Engineering the University of Hong KongHong Kong China the school of mathematics Southeast UniversityNanjing 210096China IEEE the school of mathematics and the Frontiers Science Center for Mobile Information Communication and Security Southeast UniversityNanjing 210096China the school of mathematics the Southeast UniversityNanjing 210096 the school of Electronic Information and Electrical Engineering Chengdu UniversityChengdu 610106China the Systems Research institute of the Polish Academy of Sciences Warsaw 01-447 the institute of Computer Science AGH University of Science and TechnologyKraków 30-059 the Information Technology institute University of Social SciencesŁódź90-113Poland

Dear Editor,This letter deals with the set stabilization of stochastic Boolean control networks(SBCNs)by the pinning control strategy,which is to realize the full control for systems by imposing control inputs on a fr... 详细信息

关键词： Boolean stabilization letter

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The Mechanism and Empirical Testing of the Impact of Cultural and Tourism Integration on Common Prosperity

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Journal of Resources and Ecology 2024年第4期15卷 1027-1038页

作者： PENG Yaping LIU Weizhong XIONG Changjiang BAI Xiang College of Economics and Management Xinjiang Agricultural UniversityUrumqi 830052China institute of finance and Economics Shanghai University of Finance and EconomicsShanghai 200434China

Achieving common prosperity is the essential requirement of Chinese modernization,and the integration of culture and tourism is of great significance as an important path to narrow the regional gap,and effectively“improve quality”and“increase income”.This study used the panel data of 30 provinces in China from 2010 to 2019,and conducted empirical tests by using the panel fixed effects model and the mediation effects *** results indicated that the integration of culture and tourism can significantly promote the realization of common *** integration can promote common prosperity by increasing the income and consumption level of urban and rural residents,the degree of equalization of basic public services and the capacity for sustainable *** analysis shows that there are regional differences in the promotion of common prosperity by cultural and tourism integration,which is particularly obvious in ethnic and non-ethnic ***,in response to the existing problems identified in the above analyses,countermeasure recommendations that align with the actual development are put forward.

关键词： cultural and tourism integration common prosperity urban-rural income gap mediating effect

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