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An evolutionary multiobjective method based on dominance and decomposition for feature selection in classification

science china(information sciences) 2024年第2期67卷 5-19页

作者： Jing LIANG Yuyang zhang Ke chen Boyang QU Kunjie YU Caitong YUE Ponnuthurai Nagaratnam SUGANTHAN School of Electrical and information Engineering Zhengzhou University state key laboratory of intelligent Agricultural Power Equipment School of Electrical Engineering and automation Henan Institute of Technology School of Electronics and information Zhongyuan University of Technology KINDI Center for Computing Research College of EngineeringQatar University

Feature selection in classification can be considered a multiobjective problem with the objectives of increasing classification accuracy and decreasing the size of the selected feature subset. Dominance-based and decomposition-based multiobjective evolutionary algorithms(MOEAs) have been extensively used to address the feature selection problem due to their strong global search capability. However, most of them face the problem of not effectively balancing convergence and diversity during the evolutionary process. In addressing the aforementioned issue, this study proposes a unified evolutionary framework that combines two search forms of dominance and decomposition. The advantages of the two search methods assist one another in escaping the local optimum and inclining toward a balance of convergence and diversity. Specifically, an improved environmental selection strategy based on the distributions of individuals in the objective space is presented to avoid duplicate feature subsets. Furthermore, a novel knowledge transfer mechanism that considers evolutionary characteristics is developed, allowing for the effective implementation of positive knowledge transfer between dominance-based and decomposition-based feature selection methods. The experimental results demonstrate that the proposed algorithm can evolve feature subsets with good convergence and diversity in a shorter time compared with 9 state-of-the-art feature selection methods on 20 classification problems.

关键词： evolutionary algorithms feature selection multiobjective optimization knowledge transfer classification

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Transmit Power Minimization for IRS-Assisted NOMA-UAV Networks

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china Communications 2024年第5期21卷 137-152页

作者： Zhao chen Pang Xiaowei Tang Jie Liu Mingqian Zhao Nan zhang Xiuyin Wang Xianbin School of information and Communication Engineering Dalian University of TechnologyDalian 116024China School of Electronic and information Engineering South China University of TechnologyGuangzhou 510641China state key laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China department of Electrical and Computer Engineering Western UniversityLondonON N6A 5B9Canada

The flexibility of unmanned aerial vehicles(UAVs)allows them to be quickly deployed to support ground *** reflecting surface(IRS)can reflect the incident signal and form passive beamforming to enhance the signal in the specific *** by the promising benefits of both technologies,we consider a new scenario in this paper where a UAV uses non-orthogonal multiple access to serve multiple users with *** to their distance to the UAV,the users are divided into the close users and remote *** UAV hovers above the close users due to their higher rate requirement,while the IRS is deployed near the remote users to enhance their received *** aim at minimizing the transmit power of UAV by jointly optimizing the beamforming of UAV and the phase shift of IRS while ensuring the decoding ***,the problem is ***,we decompose it into two sub-problems,including the transmit beamforming optimization and phase shift optimization,which are transformed into second-order cone programming and semidefinite programming,*** propose an iterative algorithm to solve the two sub-problems *** results prove the effectiveness of the proposed scheme in minimizing the transmit power of UAV.

关键词： intelligent reflecting surface nonorthogonal multiple access phase shift optimization transmit beamforming optimization unmanned aerial vehicle

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Anisotropy-free arrayed waveguide gratings on X-cut thin film lithium niobate platform of in-plane anisotropy

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Light(science & Applications) 2024年第7期13卷 1416-1426页

作者： Junjie Yi Changjian Guo Ziliang Ruan Gengxin chen Haiqiang Wei Liwang Lu Shengqi Gong Xiaofu Pan Xiaowan Shen Xiaowei Guan Daoxin Dai Kangping zhong Liu Liu state key laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China. Guangdong Provincial key laboratory of Optical information Materials and technology South China Academy of Advanced OptoelectronicsSouth China Normal UniversityHigher-Education Mega-CenterGuangzhou 510006China. national Center for International Research on Green Optoelectronics South China Normal UniversityGuangzhou 510006China Photonics Research Institute Department of Electrical and Electronic EngineeringThe Hong Kong Polytechnic UniversityHung HomKowloonHong Kong(SAR)China. Jiaxing key laboratory of Photonic Sensing&intelligent Imaging Intelligent Optics&Photonics Research CenterJiaxing Research Institute Zhejiang UniversityJiaxing 314000China

Arrayed waveguide grating is a versatile and scalable integrated light dispersion device,which has been widely adopted in various applications,including,optical communications and optical ***,thin-film lithium niobate emerges as a promising photonic integration platform,due to its ability of shrinking largely the size of typical lithium niobate based optical *** would also enable multifunctional photonic integrated chips on a single lithium niobate ***,due to the intrinsic anisotropy of the material,to build an arrayed waveguide grating on X-cut thin-film lithium niobate has never been ***,a universal strategy to design anisotropyfree dispersive components on a uniaxial in-plane anisotropic photonic integration platform is introduced for the first *** leads to the first implementation of arrayed waveguide gratings on X-cut thin-film lithium niobate with various configurations and *** best insertion loss of 2.4 dB and crosstalk of−24.1 dB is obtained for the fabricated arrayed waveguide grating *** of such arrayed waveguide gratings as a wavelength router and in a wavelength-division multiplexed optical transmission system are also demonstrated.

关键词： waveguide arrayed lithium

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Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

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science china(Physics,Mechanics & Astronomy) 2024年第7期67卷 142-150页

作者： Yiming Sun Yubing Tu yang Luo Shuikang Yu Hongyu Li Yunmei zhang Ping Wu Zhuying Wang Fan zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang Xianhui chen department of Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Hefei National LaboratoryUniversity of Science and Technology of ChinaHefei 230026China information Materials and intelligent Sensing laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

The superconducting ground state of kagome metals AV_(3)Sb_(5)(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal ***,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap *** implementing Bogoliubov quasiparticle interference(B QPI)imaging,we obtain k-space information on the multiband superconducting gap structureΔ_(SC)^(i)(k)in pristine CsV_(3)Sb_(5).We show that the estimated energy gap on the vanadium d_(xy/x^(2)-y^(2))orbital is anisotropic but nodeless,with a minimal value located near the M ***,a comparison ofΔ_(SC)^(i)(k)with the CDW gapΔ_(CDW)^(i)(k)obtained by angle-re solved photoemission spectro scopy(ARPES)reveals direct k-space competition between the se two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting *** the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb *** information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electro nic orders in this kagome superconductor family.

关键词： kagome lattice charge density wave superconducting energy gap scanning tunneling microscopy

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PFOA/PFOS Facilitated Intestinal Fatty Acid Absorption by Activating the PPARαPathway:Insights from Organoids Model

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Environment & Health 2024年第2期2卷 85-94页

作者： Wen zhang Yushan Tian Biao chen Shengmin Xu Lijun Wu information Materials and intelligent Sensing laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefeiAnhui 230601China china national Tobacco Quality Supervision and Test Center ZhengzhouHenan 450001China

Perfluorooctanoic acid(PFOA)and perfluorooctanesulfonate(PFOS)continue to be extensively present in the natural environment and seriously threaten human *** intestinal tract is the primary organ of PFOA/PFOS exposure due to the consumption of contaminated food and drinking ***,it remains unclear how PFOA/PFOS affects intestinal function and overall *** aim of this study was to investigate the influence of PFOA/PFOS on the absorption of fatty acids in the intestine and the underlying mechanisms using three-dimensional(3D)intestinal *** results showed that PFOS,but not PFOA,could significantly enhance the fatty acid uptake capacity without obvious damage to the ***,PFOS markedly reduced the protein levels of ChgA in enteroendocrine cells,but with no observed impact on aldolase B+***,exposure to PFOS induced the activation of the peroxisome proliferator-activated receptor(PPAR)αpathway in intestinal organoids,with enhanced expression of PPARαtarget genes associated with fatty acid metabolism,such as Fabp1 and Cd36(fatty acid transporter genes),Acox1 and Pdk4(fatty acid oxidation genes),and Plin2 and Plin3(lipid droplet synthesis genes).These data suggest that PFOS have the potential to affect the absorption function of the intestinal epithelium through the PPARαpathway,and its effect is much stronger than that of *** findings also highlight that organoids can be used as a valuable model for conducting toxicological research on environmental chemicals.

关键词： PFOA PFOS intestinal organoids fatty acid absorption enteroendocrine cells PPARα

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Three-dimensional macroscopic absorbents: From synergistic effects to advanced multifunctionalities

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Nano Research 2024年第3期17卷 1952-1983页

作者： Shijie zhang Di Lan Xingliang chen Yueyuan Gu Junwen Ren Suxuan Du Shichang Cai Xiaomiao Zhao Zhiwei Zhao Guanglei Wu School of Material science and Engineering Henan University of TechnologyZhengzhou 450001China School of Materials science and Engineering Hubei University of Automotive TechnologyShiyan 442002China key laboratory of Clean Dyeing and Finishing technology of Zhejiang Province Shaoxing UniversityShaoxing 312000China School of Resources Environment and Safety Engineering University of South ChinaHengyang 421001China College of Electrical Engineering Sichuan UniversityChengdu 610065China Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China key laboratory of Engineering Dielectrics and Its Application Ministry of EducationSchool of Electrical&Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China

The accelerated arriving of 5G era has brought a new round of intelligent transformation which will completely emancipate smart terminal *** the subsequent deleterious effect of electromagnetic wave on electronic devices is increasingly serious,driving the growth of next-generation electromagnetic wave *** a tactful combination of components and structures,three-dimensional(3D)macroscopic absorbents with fascinating synergy afford exceptional electromagnetic wave absorption,and tremendous efforts have been devoted to this ***,in terms of macroscopic absorbents and their synergistic effect,few reviews are proposed to comb the latest achievements and detailed *** review article focuses on the synergistic effect of macro-architectured absorbents mainly including structure-induced synergy,structure-components synergy,and multiple-components induced *** then the potential construction principles and strategies of macroscopic absorbents are ***,the key information for structures and components manipulation including nano-micro design and components regulation is further dissected by critically selected cutting-edge 3D macroscopic ***,a brief summary of multifunctional electromagnetic wave absorbents(EWAs)-based macroscopic structures is ***,the development prospects and challenges of these materials are discussed.

关键词： three-dimensional(3D)structures synergistic effect electromagnetic wave absorption absorption mechanism multifunction

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Design of AI-Enhanced and Hardware-Supported Multimodal E-Skin for Environmental Object Recognition and Wireless Toxic Gas Alarm

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Nano-Micro Letters 2024年第12期16卷 1-22页

作者： Jianye Li Hao Wang Yibing Luo Zijing Zhou He zhang Huizhi chen Kai Tao Chuan Liu Lingxing Zeng Fengwei Huo Jin Wu state key laboratory of Optoelectronic Materials and Technologies and the Guangdong Province key laboratory of Display Material and technology School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Ministry of Education key laboratory of Micro and Nano systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China Research&Development Institute of Northwestern Polytechnical university in Shenzhen Shenzhen 518063People’s Republic of China The Institute of Flexible Electronics(IFE Future Technologies)Xiamen UniversityXiamen 361005People’s Republic of China key laboratory of Flexible Electronics(KLOFE) School of Flexible Electronics(Future Technologies)Nanjing Tech University30 South Puzhu RoadNanjing 211816People’s Republic of China state key laboratory of Transducer technology Shanghai 200050People’s Republic of China Guangdong Provincial key laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing Guangzhou 510641People’s Republic of China state key laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065People’s Republic of China Guangdong Provincial key laboratory of Research and Development of Natural Drugs and School of Pharmacy Guangdong Medical UniversityDongguan 523808People’s Republic of China The First Dongguan Affiliated Hospital Guangdong Medical UniversityDongguan 523808People’s Republic of China Engineering Research Center of Polymer Green Recycling of Ministry of Education College of Environment and ResourcesFujian Normal UniversityFuzhou 350007People’s Republic of China

Post-earthquake rescue missions are full of challenges due to the unstable structure of ruins and successive *** of the current rescue robots lack the ability to interact with environments,leading to low rescue *** multimodal electronic skin(e-skin)proposed not only reproduces the pressure,temperature,and humidity sensing capabilities of natural skin but also develops sensing functions beyond it—perceiving object proximity and NO2 *** multilayer stacked structure based on Ecoflex and organohydrogel endows the e-skin with mechanical properties similar to natural *** robots integrated with multimodal e-skin and artificial intelligence(AI)algorithms show strong environmental perception capabilities and can accurately distinguish objects and identify human limbs through grasping,laying the foundation for automated post-earthquake ***,the combination of e-skin and NO2 wireless alarm circuits allows robots to sense toxic gases in the environment in real time,thereby adopting appropriate measures to protect trapped people from the toxic *** e-skin powered by AI algorithms and hardware circuits exhibits powerful environmental perception and information processing capabilities,which,as an interface for interaction with the physical world,dramatically expands intelligent robots’application scenarios.

关键词： Stretchable hydrogel sensors Multimodal e-skin Artificial intelligence Post-earthquake rescue Wireless toxic gas alarm

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Evidence for reversible oxygen ion movement during electrical pulsing:enabler of emerging ferroelectricity in binary oxides

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Materials Futures 2024年第3期3卷 195-205页

作者： Huan Liu Fei Yu Bing chen Zheng-Dong Luo Jiajia chen Yong zhang Ze Feng Hong Dong Xiao Yu Yan Liu Genquan Han Yue Hao state key Discipline laboratory of Wide Band Gap Semiconductor technology School of MicroelectronicsXidian UniversityXi’an 710071People’s Republic of China Research Center for intelligent Chips and Devices Zhejiang LabHangzhou 311121People’s Republic of China Engineering Research Center of Thin Film Optoelectronics technology Ministry of EducationNankai UniversityTianjin 300350People’s Republic of China

Ferroelectric HfO_(2)-based materials and devices show promising potential for applications in information technology but face challenges with inadequate electrostatic control,degraded reliability,and serious variation in effective oxide thickness *** demonstrate a novel interface-type switching strategy to realize ferroelectric characteristics in atomic-scale amorphous binary oxide films,which are formed in oxygen-deficient conditions by atomic layer deposition at low *** approach can avoid the shortcomings of reliability degradation and gate leakage increment in scaling polycrystalline doped HfO_(2)-based *** theoretical modeling and experimental characterization,we show the following.(1)Emerging ferroelectricity exists in ultrathin oxide systems as a result of microscopic ion migration during the switching process.(2)These ferroelectric binary oxide films are governed by an interface-limited switching mechanism,which can be attributed to oxygen vacancy migration and surface defects related to electron(de)trapping.(3)Transistors featuring ultrathin amorphous dielectrics,used for non-volatile memory applications with an operating voltage reduced to±1 V,have also been experimentally *** findings suggest that this strategy is a promising approach to realizing next-generation complementary metal-oxide semiconductors with scalable ferroelectric materials.

关键词： ferroelectric binary oxide mobile ion amorphous dielectric nonvolatile memory

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Understanding and improving fairness in cognitive diagnosis

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science china(information sciences) 2024年第5期67卷 99-114页

作者： Zheng zhang Le WU Qi LIU Jiayu LIU Zhenya HUANG Yu YIN Yan ZHUANG Weibo GAO Enhong chen Anhui Province key laboratory of Big Data Analysis and Application School of Computer Science and Technology& School of Data Science University of Science and Technology of China state key laboratory of Cognitive Intelligence School of Computer science and information Engineering Hefei University of Technology

intelligent education is a significant application of artificial intelligence. One of the key research topics in intelligence education is cognitive diagnosis, which aims to gauge the level of proficiency among students on specific knowledge concepts(e.g., Geometry). To the best of our knowledge, most of the existing cognitive models primarily focus on improving diagnostic accuracy while rarely considering fairness issues; for instance, the diagnosis of students may be affected by various sensitive attributes(e.g., region). In this paper,we aim to explore fairness in cognitive diagnosis and answer two questions:(1) Are the results of existing cognitive diagnosis models affected by sensitive attributes?(2) If yes, how can we mitigate the impact of sensitive attributes to ensure fair diagnosis results? To this end, we first empirically reveal that several wellknown cognitive diagnosis methods usually lead to unfair performances, and the trend of unfairness varies among different cognitive diagnosis models. Then, we make a theoretical analysis to explain the reasons behind this phenomenon. To resolve the unfairness problem in existing cognitive diagnosis models, we propose a general fairness-aware cognitive diagnosis framework, FairCD. Our fundamental principle involves eliminating the effect of sensitive attributes on student proficiency. To achieve this, we divide student proficiency in existing cognitive diagnosis models into two components: bias proficiency and fair *** design two orthogonal tasks for each of them to ensure that fairness in proficiency remains independent of sensitive attributes and take it as the final diagnosed result. Extensive experiments on the Program for International Student Assessment(PISA) dataset clearly show the effectiveness of our framework.

关键词： fairness intelligent education cognitive diagnosis psychometrics adversarial learning

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Reconciled estimation of Antarctic ice sheet mass balance and contribution to global sea level change from 1996 to 2021

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science china Earth sciences 2024年第11期67卷 3562-3578页

作者： Rongxing LI Guojun LI Gang HAI Huan XIE Yuan chenG Wei chen Xiangbin CUI Minghu DING Chunchun GAO Tong HAO Changqing KE Chuanjin LI Jin LI Yan LIU Jiangjun RAN Jiawen REN Qiang SHEN Yunzhong SHEN Hongling SHI Songyun WANG Zemin WANG Jingang ZHAN Baojun zhang Min zhong Chunxia ZHOU Center for Spatial information science and Sustainable Development Applications Tongji University College of Surveying and Geo-informatics Tongji University Institute for the Conservation of Cultural Heritage School of Cultural Heritage and Information Management Shanghai University College of Resource Environment and Tourism Hubei University of Arts and Science Polar Research Institute of china state key laboratory of Severe Weather Chinese Academy of Meteorological Sciences College of Geodesy and Geomatics Shandong University of Science and Technology School of Geography and Ocean science Nanjing University Shanghai Astronomical Observatory Chinese Academy of Sciences state key laboratory of Remote Sensing science Faculty of Geographical Science Beijing Normal University department of Earth and Space sciences Southern University of Science and Technology state key laboratory of Cryospheric science Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences state key laboratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of Sciences Center for Space Research University of Texas at Austin Chinese Antarctic Center of Surveying and Mapping Wuhan University School of Geospatial Engineering and science Sun Yat-sen University

The Antarctic Ice Sheet（AIS） has been losing ice mass and contributing to global sea level rise（GSLR）. Given its mass that is enough to cause ～58 m of GSLR, accurate estimation of mass balance trend is critical for AIS mass loss monitoring and sea level rise forecasting. Here, we present an improved approach to reconciled solutions of mass balance in AIS and its regions from multiple contributing solutions using the input-out, altimetric, and gravimetric methods. In comparison to previous methods, such as IMBIE 2018, this approach utilizes an adaptive data aggregation window to handle the heterogeneity of the contributing solutions, including the number of solutions, temporal distributions, uncertainties, and estimation techniques. We improved the regression-based method by using a two-step procedure that establishes ensembled solutions within each method（input-output, altimetry, or gravimetry） and then estimates the method-independent reconciled solutions. For the first time, 16contributing solutions from 8 Chinese institutions are used to estimate the reconciled mass balance of AIS and its regions from1996 to 2021. Our results show that AIS has lost a total ice mass of ～3213±253 Gt during the period, an equivalent of～8.9±0.7 mm of GSLR. There is a sustained mass loss acceleration since 2006, from 88.1±3.6 Gt yr-1during 1996–2005 to 130.7 ±8.4 Gt yr-1during 2006–2013 and further to 157.0±9.0 Gt yr-1during 2014–2021. The mass loss signal in the West Antarctica and Antarctic Peninsula is dominant and clearly presented in the reconciled estimation and contributing solutions, regardless of estimation methods used and fluctuation of surface mass balance. Uncertainty and challenges remain in mass balance estimation in East Antarctica. This reconciled estimation approach can be extended and applied for improved mass balance estimation in the Greenland Ice Sheet and mountain glacier regions.

关键词： Antarctic Ice Sheet Ice mass loss acceleration Sea level rise Reconciled estimation

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