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Quantifying Contribution of DER-Integrated EV Parking Lots to Reliability of Power Distribution Systems

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Energy Engineering 2021年第6期118卷 1713-1728页

作者： Bo Zeng yixian Liu Yangfan Luo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing102206China

In the future smart cities,parking lots(PLs)can accommodate hundreds of electric vehicles(EVs)at the same *** trend creates an opportunity for PLs to serve as a potential flexibility resource,considering growing penetration of EVs and integration of distributed energy resources DER(such as photovoltaic and energy storages).Given this background,this paper proposes a comprehensive evaluation framework to investigate the potential role of DER-integrated PLs(DPL)with the capability of vehicle-to-grid(V2G)in improving the reliability of the distribution *** this aim,first,an overview for the distribution system with DPLs is ***,a generic model for the available generation capacity(AGC)of DPLs with consideration of EV scheduling strategy is *** the above basis,an iterative-based algorithm leveraging sequential Monte Carlo simulation is presented to quantify the contribution of DPLs to the reliability of the *** order to verify the effectiveness of the proposed method,a series of numerical studies are carried *** simulation results show that the integration of DPLs with the V2G capability could help to improve the reliability performance of distribution grid to a great extent and reduce the adverse impact incurred by EV accommodation,if utilized properly.

关键词： Electric vehicle PV-integrated parking lots capacity support vehicle-to-grid distributed energy resource

COVID-19 Public Opinion and Emotion Monitoring System Based on Time Series Thermal New Word Mining

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Computers, Materials & Continua 2020年第9期64卷 1415-1434页

作者： yixian Zhang Jieren cheng Yifan Yang Haocheng Li Xinyi Zheng Xi chen Boyi Liu Tenglong Ren Naixue Xiong School of Information and Communication Engineering Hainan UniversityHaikou570100China School of Computer Science and Cyberspace Security Hainan UniversityHaikou570100China University of Chinese Academy of Sciences Shenzhen518000China National University of Defense Technology Changsha410000China Department of Mathematics and Computer Science Northeastern State UniversityTahlequahUSA

With the spread and development of new epidemics,it is of great reference value to identify the changing trends of epidemics in public *** designed and implemented the COVID-19 public opinion monitoring system based on time series thermal new word mining.A new word structure discovery scheme based on the timing explosion of network topics and a Chinese sentiment analysis method for the COVID-19 public opinion environment are *** a“Scrapy-Redis-Bloomfilter”distributed crawler framework to collect *** system can judge the positive and negative emotions of the reviewer based on the comments,and can also reflect the depth of the seven emotions such as Hopeful,Happy,and ***,we improved the sentiment discriminant model of this system and compared the sentiment discriminant error of COVID-19 related comments with the Jiagu deep learning *** results show that our model has better generalization ability and smaller discriminant *** designed a large data visualization screen,which can clearly show the trend of public emotions,the proportion of various emotion categories,keywords,hot topics,etc.,and fully and intuitively reflect the development of public opinion.

关键词： COVID-19 public opinion monitoring data mining Chinese sentiment analysis data visualization

Carbon armour with embedded carbon dots for building better supercapacitor electrodes

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Nano Research 2023年第5期16卷 6815-6824页

作者： Yuanyuan cheng yixian Liu chen Chu Yunliang Liu Yaxi Li Ruqiang Wu Jianchun Wu Chunqiang Zhuang Zhenhui Kang Haitao Li Institute for Energy Research School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiang 212013China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China Institute of Nuclear Science and Technology Sichuan UniversityChengdu 610064China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

The microstructure design of electrode material is a crucial point to optimize the supercapacitor’s electrochemical *** this work,a Bi-based nanocomposite with a three-layer structure(Bi–Bi_(2)O_(3)@carbon armour(CA)/carbon dots(CDs))is synthesized and *** material inherits high capacitance and high activity from bismuth-based materials,the coated CA protects the structure from complete oxidization and improves surface ***,CDs in CA can enhance the ion conduction efficiency between the catalyst,carbon membrane,*** a consequence,the specific capacitance of the electrode reaches 973 F·g^(−1)under 1 A·g^(−1),the energy density achieves 32.5 Wh·kg^(−1)with a power density of 266.9 W·kg^(−1),with impressive electrochemical stability that Coulomb efficiency of the electrode remains about 100%after 5000 ***,in-situ Fourier transformation infrared(FT-IR)analyzes the structure evolvement of the material during synthesis and finds that the annealing process of the material removes a great number of oxygen-containing groups of CA and CDs,generating oxygen vacancies,defects,thus active sites,which enhance the capacitance of the material.

关键词： supercapacitor carbon armour Bi–Bi_(2)O_(3)interface carbon dots

A fluid flow model in the lacunar-canalicular system under the pressure gradient and electrical field driven loads

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Applied Mathematics and Mechanics(English Edition) 2022年第6期43卷 899-916页

作者： Xiaogang WU Xiyu WANG Chaoxin LI Zhaowei WANG Yuqin SUN Yang YAN yixian QIN Pengcui LI Yanqin WANG Xiaochun WEI Weiyi chen College of Biomedical Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Provincial Key Laboratory for Repair of Bone and Soft Tissue Injury Taiyuan 030001China

The lacunar-canalicular system(LCS)is acknowledged to directly participate in bone tissue *** fluid flow in the LCS is synergic driven by the pressure gradient and electric field loads due to the electro-mechanical properties of *** this paper,an idealized annulus Maxwell fluid flow model in bone canaliculus is established,and the analytical solutions of the fluid velocity,the fluid shear stress,and the fluid flow rate are *** results of the fluid flow under pressure gradient driven(PGD),electric field driven(EFD),and pressure-electricity synergic driven(P-ESD)patterns are compared and *** effects of the diameter of canaliculi and osteocyte processes are *** results show that the P-ESD pattern can combine the regulatory advantages of single PGD and EFD patterns,and the osteocyte process surface can feel a relatively uniform shear stress *** the bone canalicular inner radius increases,the produced shear stress under the PGD or P-ESD pattern increases slightly but changes little under the EFD *** increase in the viscosity makes the flow slow down but does not affect the fluid shear stress(FSS)on the canalicular inner wall and osteocyte process *** increase in the high-valent ions does not affect the flow velocity and the flow rate,but the FSS on the canalicular inner wall and osteocyte process surface increases *** this study,the results show that the shear stress sensed by the osteocyte process under the P-ESD pattern can be regulated by changing the pressure gradient and the intensity of electric field,as well as the parameters of the annulus fluid and the canaliculus size,which is helpful for the osteocyte mechanical *** established model provides a basis for the study of the mechanisms of electro-mechanical signals stimulating bone tissue(cells)growth.

关键词： bone canaliculi osteocyte process pressure gradient electricity fluid shear stress(FSS)

EABDS: Attribute-Based Secure Data Sharing with Efficient Revocation in Cloud Computing

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Chinese Journal of Electronics 2015年第4期24卷 862-868页

作者： HUANG Qinlong MA Zhaofeng YANG yixian FU Jingyi NIU Xinxin Information Security Center Beijing University of Posts and Telecommunications National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications

Ciphertext-policy attribute-based encryption(CP-ABE) is becoming a promising solution to guarantee data security in cloud computing. In this paper,we present an attribute-based secure data sharing scheme with Efficient revocation(EABDS) in cloud *** scheme first encrypts data with Data encryption key(DEK) using symmetric encryption and then encrypts DEK based on CP-ABE, which guarantees the data confidentiality and achieves fine-grained access control. In order to solve the key escrow problem in current attribute based data sharing schemes, our scheme adopts additively homomorphic encryption to generate attribute secret keys of users by attribute authority in cooperation with key server, which prevents attribute authority from accessing the data by generating attribute secret keys *** scheme presents an immediate attribute revocation method that achieves both forward and backward *** computation overhead of user is also reduced by delegating most of the decryption operations to the key *** security and performance analysis results show that our scheme is more secure and efficient.

关键词： Attribute-based encryption Data sharing Attribute revocation Key escrow Cloud computing

Polarimetric synthetic aperture radar change detection for specific land cover types

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International Journal of Digital Earth 2015年第4期8卷 334-344页

作者： Meng Liu Hong Zhang Chao Wang yixian Tang Bo Zhang Fan Wu Tao Wu Xi chen Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina College of Resources and Environment University of Chinese Academy of SciencesBeijingChina Digital Technological Department East China Research Institute of Electronic EngineeringHefeiChina

This paper presents a supervised polarimetric synthetic aperture radar(PolSAR)change detection method applied to specific land cover *** each pixel of a PolSAR image,its target scattering vector can be modeled as having a complex multivariate normal *** on this assumption,the joint distribution of two corresponding vectors in a pair of PolSAR images is ***,a generalized likelihood ratio test statistic for the equality of two likelihood functions of such joint distribution is considered and a maximum likelihood distance measure for specific land cover types is ***,the Kittler and Illingworth minimum error threshold segmenta-tion method is applied to extract the specific changed *** on two repeat-pass Radarsat-2 fully polarimetric images of Suzhou,China,demonstrate that the proposed change detection method gives a good performance in determining the specific changed areas in PolSAR images,especially the areas that have changed to water.

关键词： change detection generalized likelihood ratio test KI threshold segmentation microwave remote sensing

A Novel Cross-Project Software Defect Prediction Algorithm Based on Transfer Learning

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Tsinghua Science and Technology 2022年第1期27卷 41-57页

作者： Shiqi Tang Song Huang Changyou Zheng Erhu Liu cheng Zong yixian Ding Command&Control Engineering College Army Engineering University of PLANanjing 210000China Foreign Language College Liaoning Technical UniversityFuxin 123000China

Software Defect Prediction(SDP) technology is an effective tool for improving software system quality that has attracted much attention in recent ***,the prediction of cross-project data remains a challenge for the traditional SDP method due to the different distributions of the training and testing *** major difficulty is the class imbalance issue that must be addressed in Cross-Project Defect Prediction(CPDP).In this work,we propose a transfer-leaning algorithm(TSboostDF) that considers both knowledge transfer and class imbalance for *** experimental results demonstrate that the performance achieved by TSboostDF is better than those of existing CPDP methods.

关键词： Software Defect Prediction(SDP) transfer learning imbalance class cross-project

Minimum length key in MST cryptosystems

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Science China(Information Sciences) 2017年第5期60卷 142-152页

作者： Haibo HONG Licheng WANG Haseeb AHMAD yixian YANG Zhiguo QU School of Computer Science and Information Engineering Zhejiang Gongshang University Information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and Telecommunications Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science & Technology

As a special factorization category of finite groups, logarithmic signature(LS) is used as the main component of cryptographic keys that operate within secret key cryptosystems such as PGM and public key cryptosystems like M ST1, M ST2 and M ST3. An LS with the shortest length is called a minimal logarithmic signature(MLS) that constitutes of the smallest sized blocks and offers the lowest complexity, and is therefore desirable for cryptographic constructions. However, the existence of MLSs for finite groups should be firstly taken into an account. The MLS conjecture states that every finite simple group has an MLS. If it holds, then by the consequence of Jordan-H¨older Theorem, every finite group would have an MLS. In fact, many cryptographers and mathematicians are keen for solving this problem. Some effective work has already been done in search of MLSs for finite groups. Recently, we have made some progress towards searching a minimal length key for MST cryptosystems and presented a theoretical proof of MLS conjecture.

关键词： MLS conjecture finite groups (minimal) logarithmic signature minimum length key MST cryp tosystems

Temperature is a cryptic factor shaping the geographical pattern of genetic variation in Ceratophyllum demersum across a subtropical freshwater lake

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Plant Diversity 2024年第5期46卷 630-639页

作者： yixian Li Xuyao Zhao Manli Xia Xinzeng Wei Hongwei Hou The State Key Laboratory of Freshwater Ecology and Biotechnology The Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of SciencesInstitute of HydrobiologyChinese Academy of SciencesWuhan 430072HubeiChina University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074HubeiChina

Macrophyte habitats exhibit remarkable heterogeneity,encompassing the spatial variation of abiotic and biotic components such as changes in water conditions and weather as well as anthropogenic *** factors are thought to be important drivers shaping the genetic and epigenetic variation of aquatic ***,the links among genetic diversity,epigenetic variation,and environmental variables remain largely unclear,especially for clonal aquatic ***,we performed population genetic and epigenetic analyses in conjunction with habitat discrimination to elucidate the environmental factors driving intraspecies genetic and epigenetic variation in hornwort(Ceratophyllum demersum)in a subtropical *** factors were highly correlated with the genetic and epigenetic variation of ***,with temperature being a key driver of the genetic *** temperature was detected to be correlated with greater genetic and epigenetic *** and epigenetic variation were positively driven by water temperature,but were negatively affected by ambient air *** findings indicate that the genetic and epigenetic variation of this clonal aquatic herb is not related to the geographic feature but is instead driven by environmental conditions,and demonstrate the effects of temperature on local genetic and epigenetic variation in aquatic systems.

关键词： Genetic diversity Epigenetic variation Temperature Macrophyte Restoration