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Throughput-oriented associated transaction assignment in sharding blockchains for IoT social data storage

Digital Communications and Networks 2022年第6期8卷 885-899页

作者： Liping Tao Yang Lu Xu Ding yuqi fan Jung Yoon Kim School of Computer Science and Information Engineering Hefei University of TechnologyHefei230009China Engineering Research Center of Safety Critical Industrial Measurement and Control Technology Ministry of EducationHefei University of TechnologyHefei230009China Institute of Industry&Equipment Technology Hefei University of TechnologyHefei230009China Key Laboratory of Knowledge Engineering with Big Data(Hefei University of Technology) Ministry of EducationHefei230009China Graduate School of Game Gachon UniversitySeongnam-Si461-701South Korea

Blockchain is a viable solution to provide data integrity for the enormous volume of 5G IoT social data, while we need to break through the throughput bottleneck of blockchain. Sharding is a promising technology to solve the problem of low throughput in blockchains. However, cross-shard communication hinders the effective improvement of blockchain throughput. Therefore, it is critical to reasonably allocate transactions to different shards to improve blockchain throughput. Existing research on blockchain sharding mainly focuses on shards formation, configuration, and consensus, while ignoring the negative impact of cross-shard communication on blockchain throughput. Aiming to maximize the throughput of transaction processing, we study how to allocate blockchain transactions to shards in this paper. We propose an Associated Transaction assignment algorithm based on Closest Fit (ATCF). ATCF classifies associated transactions into transaction groups which are then assigned to different shards in the non-ascending order of transaction group sizes periodically. Within each epoch, ATCF tries to select a shard that can handle all the transactions for each transaction group. If there are multiple such shards, ATCF selects the shard with the remaining processing capacity closest to the number of transactions in the transaction group. When no such shard exists, ATCF chooses the shard with the largest remaining processing capacity for the transaction group. The transaction groups that cannot be completely processed within the current epoch will be allocated in the subsequent epochs. We prove that ATCF is a 2-approximation algorithm for the associated transaction assignment problem. Simulation results show that ATCF can effectively improve the blockchain throughput and reduce the number of cross-shard transactions.

关键词： IoT social data Blockchain Shar ding Associated transactions Transaction assi gnment

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Detecting Domain Generation Algorithms with Bi-LSTM

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Computers, Materials & Continua 2019年第9期61卷 1285-1304页

作者： Liang Ding Lunjie Li Jianghong Han yuqi fan Donghui Hu School of Computer Science and Information Engineering Hefei University of TechnologyHefei230009China Department of Computer Science University of Texas at DallasCampbell RdRichardsonTexas75080USA

Botnets often use domain generation algorithms(DGA)to connect to a command and control(C2)server,which enables the compromised hosts connect to the C2 server for accessing many *** detection of DGA domains is critical for blocking the C2 server,and for identifying the compromised hosts as ***,the detection is difficult,because some DGA domain names look *** of the previous work based on statistical analysis of machine learning relies on manual features and contextual information,which causes long response time and cannot be used for real-time *** addition,when a new family of DGA appears,the classifier has to be re-trained from the very *** paper presents a deep learning approach based on bidirectional long short-term memory(Bi-LSTM)model for DGA domain *** classifier can extract features without the need for manual feature extraction,and the trainable model can effectively deal with new unknown DGA family *** addition,the proposed model only needs the domain name without any additional context *** domain names are preprocessed by bigram and the length of each processed domain name is set as a value longer than the most *** LSTM model receives the encoded data and returns labels to check whether domain names are normal or *** show that our model outperforms state-of-the-art approaches and is able to detect new DGA families reliably.

关键词： Bidirectional LSTM network security DGA

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Computing Resource Allocation for Blockchain-Based Mobile Edge Computing

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 863-885页

作者： Wanbo Zhang yuqi fan Jun Zhang Xu Ding Jung Yoon Kim School of Computer Science and Information Engineering Intelligent Interconnected Systems Laboratory of Anhui ProvinceHefei University of TechnologyHefei230601China Anhui Province Key Lab of Aerospace Structural Parts Forming Technology and Equipment Hefei University of TechnologyHefei230009China College of Future Industry Gachon UniversitySeongnam13120South Korea

Users and edge servers are not fullymutually trusted inmobile edge computing(MEC),and hence blockchain can be introduced to provide *** blockchain-basedMEC,each edge server functions as a node in bothMEC and blockchain,processing users’tasks and then uploading the task related information to the *** is,each edge server runs both users’offloaded tasks and blockchain tasks *** that there is a trade-off between the resource allocation for MEC and blockchain ***,the allocation of the resources of edge servers to the blockchain and theMEC is crucial for the processing delay of blockchain-based *** of the existing research tackles the problem of resource allocation in either blockchain or MEC,which leads to unfavorable performance of the blockchain-based MEC *** this paper,we study how to allocate the computing resources of edge servers to the MEC and blockchain tasks with the aimtominimize the total systemprocessing *** the problem,we propose a computing resource Allocation algorithmfor Blockchain-based MEC(ABM)which utilizes the Slater’s condition,Karush-Kuhn-Tucker(KKT)conditions,partial derivatives of the Lagrangian function and subgradient projection method to obtain the *** results show that ABM converges and effectively reduces the processing delay of blockchain-based MEC.

关键词： Mobile edge computing blockchain resource allocation

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Path for Building Characteristic Towns in Industrial Towns: A Case Study of Chengkou Town in Wudi County

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Asian Agricultural Research 2019年第12期11卷 10-11,23页

作者： yuqi fan College of City Construction Jiangxi Normal UniversityNanchang 330022China

At present,China’s new urbanization construction is making rapid progress,and the construction of characteristic towns has become a hot spot. The promotion of characteristic towns in various places has brought many opportunities for new urbanization. In addition,it has greatly promoted the transformation and development of the characteristic resources. However,many new problems have been exposed during the transformation process. Taking construction of characteristic town Chengkou Town in Wudi County as an example,this paper discussed the development paths for building characteristic towns in light industrial towns,in the hope of finding a new direction and solution.

关键词： Industrial town Characteristic town Chengkou Town Transformation and development

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Development of the peanut precision fertilization control system based on threshold velocity algorithm

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International Journal of Agricultural and Biological Engineering 2022年第5期15卷 116-122页

作者： yuqi fan Yan Yu Shuqi Shang Tianying Gu Yanrui Hu Linsong Diao Ruchao Ge Xing Zhang College of Mechanical and Electrical Engineering Qingdao Agricultural UniversityQingdao 266109ShandongChina

In view of the fact that the current ground wheel velocimetry of the peanut precision fertilizer control system cannot solve the phenomenon of ground wheel slippage,and signal interference and delay loss cannot be excluded by BeiDou positioning velocimetry,a set of peanut precision fertilizer control system was designed based on the threshold speed *** system used STM32F103ZET6 microcontroller as the main controller,and touch screen for setting the operating parameters such as operating width,fertilizer type,and fertilizer application *** threshold speed algorithm combined with BeiDou and ground wheel velocimetry was adopted to obtain the forward speed of the tractor and adjust the speed of the DC drive motor of the fertilizer applicator in real time to achieve precise fertilizer ***,through the threshold speed algorithm test,the optimal value of the length N of the ground wheel speed measurement queue was determined as 3,and the threshold of the speed variation coefficient was set to 4.6%.Then,the response performance of the threshold speed algorithm was verified by comparative test with different fertilization amounts(40 kg/hm^(2),50 kg/hm^(2),60 kg/hm^(2),70 kg/hm^(2))under two speed acquisition methods of ground wheel speed measurement and threshold speed algorithm(combination of Beidou single-point speed and ground wheel speed measurement)in different operation speeds(3 km/h,4 km/h,5 km/h).The response performance test results showed that the average value of the velocimetry delay distance of the BeiDou single-point positioning velocimetry method was 0.58 m,while the average value of that with the threshold velocity algorithm was 0.27 m,which decreased by 0.31 m and indicated more accurate with the threshold velocity *** field comparison test for fertilizer application performance turned out an over 96.08%accuracy rate of fertilizer discharge by applied with the threshold speed algorithm,which effectively avoided the ina

关键词： peanut precision fertilizer planter BeiDou velocimetry ground wheel velocimetry threshold speed algorithm control system

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A Flight Trajectory Prediction Method Based on Internal Relationships between Attributes

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计算机科学与技术汇刊（中英文版） 2023年第1期10卷 1-10页

作者： Liwei Wu yuqi fan School of Computer Science and Information Engineering/Hefei University of Technology HefeiAnhui230000China

The rapid development of the aviation industry urgently requires airspace traffic management,and flight trajectory prediction is a core component of airspace traffic *** trajectory is a multidimensional time series with rich spatio-temporal characteristics,and existing flight trajectory prediction methods only target the trajectory point temporal relationships,but not the implicit interrelationships among the trajectory point *** this paper,a graph convolutional network(AR-GCN)based on the intra-attribute relationships is proposed for solving the flight track prediction ***,the network extracts the temporal features of each attribute and fuses them with the original features of the attribute to obtain the enhanced attribute features,then extracts the implicit relationships between attributes as inter-attribute relationship ***,the enhanced attribute features are used as nodes and the inter-attribute relationship features are used as edges to construct the inter-attribute relationship ***,the graph convolutional network is used to aggregate the attribute *** on the full fusion of the above features,we achieved high accuracy prediction of the *** this paper,experiments are conducted on ADS-B historical track *** compare our method with the classical method and the proposed *** results show that our method achieves significant improvement in prediction accuracy.

关键词： Deep Learning Graph Convolution Neural Network Flight Trajectory Prediction

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QoS-Constrained,Reliable and Energy-Efficient Task Deployment in Cloud Computing

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计算机科学与技术汇刊（中英文版） 2024年第1期11卷 22-31页

作者： Zhenghui Zhang yuqi fan School of Computer Science and Information Engineering Hefei University of TechnologyHefeiAnhui230000China

Reliability,QoS and energy consumption are three important concerns of cloud service *** of the current research on reliable task deployment in cloud computing focuses on only one or two of the three ***,these three factors have intrinsic trade-off *** existing studies show that load concentration can reduce the number of servers and hence save *** this paper,we deal with the problem of reliable task deployment in data centers,with the goal of minimizing the number of servers used in cloud data centers under the constraint that the job execution deadline can be met upon single server *** propose a QoS-Constrained,Reliable and Energy-efficient task replica deployment(QSRE)algorithm for the problem by combining task replication and *** each task in a job that cannot finish executing by re-execution within deadline,we initiate two replicas for the task:main task and task *** main task runs on an individual *** associated task replica is deployed on a backup server and completes part of the whole task load before the main task *** from the main tasks,multiple task replicas can be allocated to the same backup server to reduce the energy consumption of cloud data centers by minimizing the number of servers required for running the task ***,QSRE assigns the task replicas with the longest and the shortest execution time to the backup servers in turn,such that the task replicas can meet the QoS-specified job execution deadline under the main task *** conduct experiments through *** experimental results show that QSRE can effectively reduce the number of servers used,while ensuring the reliability and QoS of job execution.

关键词： Cloud Computing Task Deployment Reliability Quality of Service Energy Consumption

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Research and Application of Ecological Outdoor Ground Structure with Composite Water Storage and Drainage Function

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Asian Agricultural Research 2023年第10期15卷 6-9页

作者： Peng ZHONG yuqi fan Zhenggen fan College of City Construction Jiangxi Normal UniversityNanchang 330022China

In order to solve the problems of surface runoff increase,water accumulation in rainy days and urban heat island effect,an ecological outdoor ground structure with composite water storage and drainage functions was studied and applied in this paper:Through the comprehensive design of road ground,road inspection well,garden inspection well and drainage pipe network,it can quickly store and drain ground water,alleviate the urban heat island effect,realize plant infiltration irrigation,and achieve the purpose of saving water and energy.

关键词： Composite water storage and drainage Waterlogging prevention Ecological type Outdoor ground

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Low Trap Density Para-F Substituted 2D PEA_(2)PbI_(4)(X=Cl,Br,I)Single Crystals with Tunable Optoelectrical Properties and High Sensitive X-Ray Detector Performance

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Research 2023年第1期2022卷 273-283页

作者： Jiayu Di Haojin Li Li Chen Siyu Zhang Yinhui Hu Kai Sun Bo Peng Jie Su Xue Zhao yuqi fan Zhenhua Lin Yue Hao Peng Gao Kui Zhao Jingjing Chang State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of MicroelectronicsXidian University710071 XianChina Advanced Interdisciplinary Research Center for Flexible Electronics Academy of Advanced Interdisciplinary ResearchXidian University710071 Xi'anChina Key Laboratory of Applied Surface and Collid Chemistry National Ministry of EducationSchool of Materials Science and EngineeringShaanxi Normal University710119 Xi'anChina CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Exploring halogen engineering is of great significance for reducing the density of defect states in crystals of organic-inorganic hybrid perovskites and hence improving the crystal ***,high-quality single crystals of PEA_(2)PbI_(4)(X=CI,Br,I)and their para-F(p-F)substitution analogs are prepared using the facile solution method to study the effects of both p-F substitution and halogen anion *** p-F substitution,the triclinic PEA_(2)PbX_(4)(X=Cl,Br)and cubic PEA_(2)PbX_(4)(X=I)crystals unifies to monoclinic crystal structure for p-F-PEA_(2)PbX_(4)(X=Cl,Br,I)*** p-F substitution and halogen engineering,together with crystal structure variation,enable the tunability of optoelectrical ***,after the p-F substitution,the energy levels are lowered with increased Fermi levels,and the bandgaps of p-F-PEA_(2)PbX_(4)(X=Cl,Br,I)are slightly *** from the enhancement of the charge transfer and the reduced trap density by p-F substitution and halogen anion engineering,the average carrier lifetime of the p-F-PEA_(2)PbI_(4)is obviously *** with PEA_(2)PbI_(4)the X-ray detector based on p-F-PEA_(2)PbI_(4)single crystals exhibits higher radiation stability under high-dose X-ray irradiation,implying long-term operando stability.

关键词： properties stability substitution

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纳米零价铁添加对猪粪好氧堆肥碳循环影响机制

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西北农业学报 2023年第8期32卷 1314-1324页

作者：范钰琪任嘉豪西北大学化学与材料科学学院西安710127 东北大学材料科学与工程学院沈阳110819

旨在探究猪粪堆肥过程中添加纳米零价铁(NZVI)对堆肥碳循环的影响。将NZVI以干质量比0、2.5%、5%和7.5%与猪粪和枸杞枝条混合后,进行为期50 d的好氧堆肥。结果表明,在好氧堆肥过程中,堆肥有机质降解率随着NZVI添加比例增加而增加,但NZV... 详细信息

旨在探究猪粪堆肥过程中添加纳米零价铁(NZVI)对堆肥碳循环的影响。将NZVI以干质量比0、2.5%、5%和7.5%与猪粪和枸杞枝条混合后,进行为期50 d的好氧堆肥。结果表明,在好氧堆肥过程中,堆肥有机质降解率随着NZVI添加比例增加而增加,但NZVI添加比例越高,富里酸和胡敏素降解速率越低。同时,NZVI添加增加CO 2和CH 4排放量,分别增加50.82%~1.04倍和1.28倍~1.51倍。进一步分析表明,NZVI的添加提高了Sphaerobacter和Luteimonas相对丰度,促进难降解有机物的降解率。此外,NZVI添加能促进堆肥的脱毒,降低堆肥产品的生物毒性。在堆肥过程中,添加NZVI没有观察到腐殖物质的显著增加,但促进了有机质降解和产品脱毒,因此可用于有机物料的快速堆肥化处理。

关键词：纳米零价铁好氧堆肥碳损失碳循环

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