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Design and Mechanical Characterization of an S-Based TPMS Hollow Isotropic Cellular Structure

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Computer Modeling in Engineering & Sciences 2022年第5期131卷 695-713页

作者： Junjian Fu Pengfei Sun yixian Du Lei Tian Qihua Tian Xiangman Zhou College of Mechanical and Power Engineering China Three Gorges UniversityYichang443002China Hubei Key Laboratory of Hydroelectric Machinery Design&Maintenance Yichang443002China

Cellular structures are regarded as excellent candidates for lightweight-design,load-bearing,and energy-absorbing *** this paper,a novel S-based TPMS hollow isotropic cellular structure is proposed with both superior load-bearing and energy-absorbing *** hollow cellular structure is designed with Boolean operation based on the Fischer-Koch(S)implicit triply periodic minimal surfaces(TPMS)with different level *** anisotropy and effective elasticity properties of cellular structures are evaluated with the numerical homogenization *** finite element method is further conducted to analyze the static mechanical performance of hollow cellular structure considering the size *** compression experiments are finally carried out to reveal the compression properties and energy-absorption *** results of the Zener ratio proved that the S-based hollow cellular structure tends to be isotropic,even better than the sheet-based Gyroid *** with the solid counterpart,the S-based hollow cellular structure has a higher elastic modulus,better load-bearing and energy absorption characteristics.

关键词： Hollow cellular structure triply periodic minimal surfaces isotropic property energy absorption load-bearing

Power Grid Fault Diagnosis Based on Deep Pyramid Convolutional Neural Network

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2188-2203页

作者： Xu Zhang Huiting Zhang Dongying Zhang yixian Wang Ruiting Ding Yuchuan Zheng Yongxu Zhang the School of Electrical&Electronic Engineering North China Electric Power UniversityBeijing 102206China

Existing power grid fault diagnosis methods relyon manual experience to design diagnosis models, lack theability to extract fault knowledge, and are difficult to adaptto complex and changeable engineering sites. Considering thissituation, this paper proposes a power grid fault diagnosismethod based on a deep pyramid convolutional neural networkfor the alarm information set. This approach uses the deepfeature extraction ability of the network to extract fault featureknowledge from alarm information texts and achieve end-to-endfault classification and fault device identification. First, a deeppyramid convolutional neural network model for extracting theoverall characteristics of fault events is constructed to identifyfault types. Second, a deep pyramidal convolutional neuralnetwork model for alarm information text is constructed, thetext description characteristics associated with alarm informationtexts are extracted, the key information corresponding to faultsin the alarm information set is identified, and suspicious faultydevices are selected. Then, a fault device identification strategythat integrates fault-type and time sequence priorities is proposedto identify faulty devices. Finally, the actual fault cases and thefault cases generated by the simulation are studied, and theresults verify the effectiveness and practicability of the methodpresented in this paper.

关键词： Alarm information deep pyramid convolutional neural network fault classification fault device identification feature extraction key information

Retrieval of urban slow deformation using the multi-baseline DInSAR technique

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Chinese Science Bulletin 2008年第23期53卷 3705-3714页

作者： WU mao ZHANG Hong WANG Chao TANG yixian WU HongAn The State Key Laboratory of Remote Sensing Science Sponsored Jointly by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University Beijing 100101 China Center for Earth Observation and Digital Earth Chinese Academy of Sciences Beijing 100086 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

The investigation of slow displacement in urban areas using the multi-baseline DInSAR technique has been a hot research topic in the field of DInSAR. The basic flow of this technique includes several steps such as the combination of interferometric image pairs, generation of differential interferograms, selection of high coherent points, generation of the Delaunay triangular network, calculation and integration of increments in network, unwrapping and calibration of the residual phase, and the estimation of both atmospheric and nonlinear displacement phase. Among these steps, the calculation of increments is the key to retrieve linear displacement, while unwrapping and calibration of the residual phase are the keys to retrieve nonlinear displacement. In order to improve the performance of these two steps, this paper proposes a modified model coherence function for increments estimation, and a triangular "circle" algorithm to deal with phase unwrapping and calibration. Based on the above algorithms, the subsidence of Suzhou City is investigated using 24 ERS scenes from February 1993 to December 2000. The results show that the linear subsidence velocity of the most urban area is about -20 to -30 mm/a during the time, with a yearly decrease in velocity. The displacement seems to be stable after 2000. Leveling data validate our results and demonstrate the reliability of the algorithm.

关键词：基线 DInSAR 地表面变形遥感技术

Linking microbial community composition to farming pattern in selenium-enriched region:Potential role of microorganisms on Se geochemistry

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Journal of Environmental Sciences 2022年第2期34卷 269-279页

作者： Yanhong Wang Xinyan Shi Xianxin Huang Chunlei Huang Helin Wang Hanqin Yin yixian Shao Ping Li State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 430074China Zhejiang Institute of Geological Survey Hangzhou 311203China

Selenium(Se)is an essential micronutrient for *** microbial communities play an important role on Se geochemistry in *** this study,the microbial community composition and functions of 53 soil samples were investigated using high-throughput *** were divided into 3 groups with different farming types based on the measured geochemical parameters and microbial functional *** indicated that putative Se related bacteria Bacillus,Dyella,Paenibacillus,Burkholderia and Brevibacillus were dominant in dryland plantation soils which were characterized with higher available Se and low contents of H_(2)O,total organic carbon(TOC),NH_(4)^(+) and NO_(2)^(-).In contrast,the putative denitrifier Pseudomonas dominated in flooded paddy soils with higher TOC,NO_(3)^(-) and organic Se,whereas genera Rhizobium,Nitrosospira,and Geobacter preferred woodland soils with higher oxidation-reduction potential(ORP),pH,NH_(4)^(+) and *** patterns resulted in distinct geochemical parameters including moisture,pH,ORP,TOC,and contents of soluble Fe,NO_(2)^(-) and NH_(4)^(+),shaping the microbial communities,which in turn affected Se forms in *** study provides a valuable insight into understanding of Se biogeochemistry in soils and prospective strategy for Se-rich agriculture production.

关键词： Selenium biogeochemistry Indigenous microbial community Farming patterns High-throughput sequencing FAPROTAX

Primitives towards verifiable computation： a survey

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Frontiers of Computer Science 2018年第3期12卷 451-478页

作者： Haseeb AHMAD Licheng WANG Haibo HONG Jing LI Hassan DAWOOD Manzoor AHMED yixian YANG State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China School of Computer Science and Information Engineering Zhejiang Gongshang University Hangzhou 310018 China Department of Computer Engineering University of Engineering and Technology Taxila 47050 Pakistan Future Internet & Communication Lab Department of Electronic Engineering Tsinghua University Beijing 100084 China

Verifiable computation （VC） paradigm has got the captivation that in real term is highlighted by the concept of third party computation. In more explicate terms, VC allows resource constrained clients/organizations to securely outsource expensive computations to untrusted service providers, while acquiring the publicly or privately verifiable results. Many mainstream solutions have been proposed to address the diverse problems within the VC domain. Some of them imposed assumptions over performed computations, while the others took advantage of interactivity /non-interactivity, zero knowledge proofs, and arguments. Further proposals utilized the powers of probabilistic checkable or computationally sound proofs. In this survey, we present a chronological study and classify the VC proposals based on their adopted domains. First, we provide a broader overview of the theoretical advancements while critically analyzing them. Subsequently, we present a comprehensive view of their utilization in the state of the art VC approaches. Moreover, a brief overview of recent proof based VC systems is also presented that lifted up the VC domain to the verge of practicality. We use the presented study and reviewed resuits to identify the similarities and alterations, modifications, and hybridization of different approaches, while comparing their advantages and reporting their overheads. Finally, we discuss implementation of such VC based systems, their applications, and the likely future directions.

关键词： verifiable computation cloud computation interactive non-interactive zero knowledge probabilisticcheckable proofs computationally sound proofs

Consistency of weighted feature set and polyspectral kernels in individual communication transmitter identification

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Frontiers of Electrical and Electronic Engineering in China 2010年第4期5卷 488-492页

作者： Na SUN Yajian ZHOU yixian YANG Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Network and Information Attack and Defense Technology of Ministry of Education Beijing University of Posts and TelecommunicationsBeijing 100876China

This paper presents a method using support vector machine with polyspectral kernels for classification of individual ***,the neighborhood-roughset-based weighted feature set is *** experiments of the algorithms mentioned above indicate that they have consistency,which raises a new weighted *** experiment shows that better classification rate can be achieved.

关键词： polyspectral kernel support vector machine(SVM) neighborhood rough set weighted feature set weighted kernel

A Smart Wearable Ring Device for Sensing Hand Tremor of Parkinson’s Patients

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Computer Modeling in Engineering & Sciences 2021年第3期126卷 1217-1238页

作者： Haixia Yang yixian Shen Wei Zhuang Chunming Gao Dong Dai Weigong Zhang School of Instrument Science and Engineering Southeast UniversityNanjing210096China School of Computer and Software Nanjing University of Information Science and TechnologyNanjing210044China School of Engineering and Technology University of WashingtonTacoma98402USA School of Cyber Science and Engineering Southeast UniversityNanjing210096China

Parkinson’s disease(PD)is a very common neurodegenerative disease that occurs mostly in the *** are many main clinical manifestations of PD,such as tremor,bradykinesia,muscle rigidity,*** on the current research on PD,the accurate and convenient detection of early symptoms is the key to detect *** the development of microelectronic and sensor technology,it is much easier to measure the barely noticeable tremor in just one hand for the early detection of Parkinson’s *** this paper,we present a smart wearable device for detecting hand tremor,in which MPU6050(MIDI Processing Unit)consisting of a 3-axis gyroscope and a 3-axis accelerometer is used to collect acceleration and angular velocity of *** analyzing the time of specific finger movements,we successfully recognized the tremor signals with high ***,with Bluetooth 4.0(Bluetooth Low Energy,BLE)and networking terminal ability,tremor data can be transferred to a monitoring device in real time with extremely lowenergy *** experimental results have shown that the proposed device(smart ring)is convenient for long-term tremor detection which is vital for early detection and treatment for Parkinson’s disease.

关键词： Parkinson’s disease tremor detection IMU sensor MPU6050 BLE

No seamount subduction,no magmatic arc?

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Earth and Planetary Physics 2022年第4期6卷 424-429页

作者： XiaoBo He JunTao Tao Yi Cao FaBin Pan EnYuan He LingMin Cao yixian Zheng Department of Ocean Exploration&Technology Zhejiang Ocean UniversityZhoushan Zhejiang 316022China School of Earth Sciences China University of GeosciencesWuhan 430074China Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Department of Marine Sciences Zhejiang UniversityZhoushan Zhejiang 316021China

Water is essential for the formation of a magmatic arc by lowering the melting temperature of materials in the mantle *** such,it is logical to attribute the absence of a magmatic arc to insufficient water released from the subducting plate,although a number of other factors may cause volcanic arc quiescence as well,such as a slab window or flat slab *** this contribution,we present a possible but testable correlation between the occurrence of a magmatic arc and seamount subduction in light of bathymetric data obtained near *** correlation,if it holds true,in turn means that a magmatic arc is unlikely to occur when the subducting slabs have not been severely fractured and that one of the main reasons for excluding effects such as the slab window or flat slab subduction may be that the plate is not accompanied by ***,the role that seamount subduction plays in recycling water back into the mantle deserves more attention from the earth sciences community.

关键词： seamount subduction arc volcano slab dehydration slab faulting bathymetric anomaly

Construction and Implementation of OBE-based Practical Course for Software System Development with Solid Foundation and Continuous Improvement

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计算机教育 2023年第12期 280-287页

作者： yixian Liu Guo Jun Lin Hou Dongming chen Software College Software Engineering National Experimental Teaching Demonstration CenterNortheastern UniversityShenyang110169China

Software engineering is a highly practical major,and students need a lot of hands-on practice to transform the theoretical contents learned in class into the practical ability to solve practical problems,so practical courses are an essential and important part in the process of training talents in software *** the point of view of cultivating talents in software engineering,this paper expounds the important position of practical courses in software engineering in the process of cultivating talents,analyzes the problems in the existing practical courses,and puts forward the construction ideas and characteristics of practical courses in software engineering which strengthen the foundation,advance steadily,and face the *** the practical course for software system development as an example,this paper introduces in detail the concrete implementation process,achievements,existing problems and countermeasures of the course.

关键词： Practical courses OBE-based Software system development