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Study on How to Design Knitted Fabric Pattern with Mathematical Theory

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Journal of Donghua University(English Edition) 2009年第2期26卷 204-206页

作者：陈莉张蕊叶介茂 School of Textiles Tianjin Polytechnic University Tianjin Transportation vocational college

To improve design capabilities for the knitted fabric pattern,a preliminary study is carried out for the design *** on mathematical theory,pattern could be created automatically by computer with inputting different parameters for mathematical *** knitted fabric simulation is realized by M1 CAD pattern preparation system of STOLL *** the pattern,different color unit is replaced by obverse stitch with different color,or by obverse stitch and reverse stitch with the same color separately,after that the effects of knitted fabrics could be *** with this method,it would not only help to acquire a great of diversity patterns,but also improve design efficiency and save cost.

关键词： knitted fabric mathematical theory patterndesign CAD fabric simulation

A Dynamic Memory Allocation Optimization Mechanism Based on Spark

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Computers, Materials & Continua 2019年第8期61卷 739-757页

作者： Suzhen Wang Shanshan Geng Zhanfeng Zhang Anshan Ye Keming Chen Zhaosheng Xu Huimin Luo Gangshan Wu Lina Xu Ning Cao college of Information Technology Hebei University of Economics and BusinessShijiazhuang050061China college of Mathematics and Computer Science Xinyu UniversityXinyu338004China School of Information Engineering Jiangsu Polytechnic College of Agriculture and ForestryJurong212400China School of Computer Science University College DublinDublin 4Ireland college of Information Engineering Sanming UniversitySanming365004China

Spark is a distributed data processing framework based on *** allocation is a focus question of Spark research.A good memory allocation scheme can effectively improve the efficiency of task execution and memory resource utilization of the *** at the memory allocation problem in the Spark2.x version,this paper optimizes the memory allocation strategy by analyzing the Spark memory model,the existing cache replacement algorithms and the memory allocation methods,which is on the basis of minimizing the storage area and allocating the execution area according to the *** mainly including two parts:cache replacement optimization and memory allocation ***,in the storage area,the cache replacement algorithm is optimized according to the characteristics of RDD Partition,which is combined with PCA *** this section,the four features of RDD Partition are *** the RDD cache is replaced,only two most important features are selected by PCA dimension reduction method each time,thereby ensuring the generalization of the cache replacement ***,the memory allocation strategy of the execution area is optimized according to the memory requirement of Task and the memory space of storage *** this paper,a series of experiments in Spark on Yarn mode are carried out to verify the effectiveness of the optimization algorithm and improve the cluster performance.

关键词： Memory calculation memory allocation optimization cache replacement optimization

Precise robust motion control of cell puncture mechanism driven by piezoelectric actuators with fractional-order nonsingular terminal slidingmode control

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Bio-Design and Manufacturing 2020年第4期3卷 410-426页

作者： Shengdong Yu Hongtao Wu Mingyang Xie Haiping Lin Jinyu Ma Wenzhou polytechnic Wenzhou 325000China Nanjing University of Aeronautics and Astronautics Nanjing 210016China Hangzhou vocational and Technical college Hangzhou 310000China

A novel robust controller is proposed in this study to realize the precise motion control of a cell puncture mechanism(CPM)driven by piezoelectric ceramics(PEAs).The entire dynamic model of CPM is constructed based on the Bouc–Wen model,and the nonlinear part of the dynamic model is optimized locally to facilitate the construction of a robust controller.A model-based,nonlinear robust controller is constructed using time-delay estimation(TDE)and fractional-order nonsingular terminal sliding mode(FONTSM).The proposed controller does not require prior knowledge of unknown disturbances due to its real-time online estimation and compensation of unknown terms by using the TDE *** controller also has finite-time convergence and high-precision trajectory tracking capabilities due to FONTSM manifold and fast terminal sliding mode-type reaching *** stability of the closed-loop system is proved by Lyapunov stability *** simulation and hardware-in-loop simulation experiments of CPM verify that the proposed controller outperforms traditional terminal sliding mode controllers,such as the integer-order or model-free *** proposed controller can also continuously output without chattering and has high control *** embryo is used as a verification target to complete the cell puncture *** the engineering application perspective,the proposed control strategy can be effectively applied in a PEA-driven CPM.

关键词： Cell puncture mechanism(CPM) Piezoelectric actuator(PEA) Robust motion control Fractional-order nonsingular terminal sliding mode(FONTSM) Time-delay estimation(TDE)

SNES: Social-Network-Oriented Public Opinion Monitoring Platform Based on ElasticSearch

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Computers, Materials & Continua 2019年第9期61卷 1271-1283页

作者： Chuiju You Dongjie Zhu Yundong Sun Anshan Ye Gangshan Wu Ning Cao Jinming Qiu Helen Min Zhou college of Information Engineering Sanming UniversitySanming365004China School of Computer Science and Technology Harbin Institute of TechnologyWeihai264209China college of Mathematics and Computer Science Xinyu UniversityXinyu338004China School of Information Engineering Jiangsu Polytechnic College of Agriculture and ForestryJurong212400China School of Engineering Manukau Institute of TechnologyAuckland2241New Zealand

With the rapid development of social network,public opinion monitoring based on social networks is becoming more and more *** platforms have achieved some success in public opinion ***,these platforms cannot perform well in scalability,fault tolerance,and real-time *** this paper,we propose a novel social-network-oriented public opinion monitoring platform based on ElasticSearch(SNES).Firstly,SNES integrates the module of distributed crawler cluster,which provides real-time social media data ***,SNES integrates ElasticSearch which can store and retrieve massive unstructured data in near real ***,we design subscription module based on Apache Kafka to connect the modules of the platform together in the form of message push and consumption,improving message throughput and the ability of dynamic horizontal scaling.A great number of empirical experiments prove that the platform can adapt well to the social network with highly real-time data and has good performance in public opinion monitoring.

关键词： Social network public opinion monitoring elasticsearch scrapy-redis

Nonlinear Identification and Control of Laser Welding Based on RBF Neural Networks

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Computer Systems Science & Engineering 2022年第4期41卷 51-65页

作者： Hongfei Wei Hui Zhao Xinlong Shi Shuang Liang Henan polytechnic Institute Nanyang473000China Zhengzhou Railway vocational&Technical college Zhengzhou450000China University of Florence Firenze50041Italy

A laser beam is a heat source with a high energy density;this technol-ogy has been rapidly developed and applied in theﬁeld of welding owing to its potential advantages,and supplements traditional welding *** in-depth analysis of its operating process could establish a good foundation for its application in *** is widely understood that the welding process is a highly nonlinear and multi-variable coupling process;it comprises a signiﬁcant number of complex processes with random uncertain *** of their nonlinear mapping and self-learning characteristics,artiﬁcial neural networks(ANNs)have certain advantages in comparison to traditional methods in theﬁeld of *** welding is a nonlinear dynamic process;these processes still pose a major challenge in theﬁeld of ***,establishing a stable model is a pre-requisite for achieving accurate *** this study,the identiﬁcation and con-trol of radial basis function neural networks in laser welding processes and self-tuning PID control methods are proposed to improve weld *** a MATLAB simulation,it is shown that the proposed method can obtain a good description of the level of nonlinear dynamic control,and that the algorithm iden-tiﬁcation accuracy is high,practical,and *** this method,the weld width quickly reaches the expected value and the system remains stable,with good ***,it ensures the stability and dynamic performance of the welding process and improves weld quality.

关键词： Laser welding radial basis function neural networks self-tuning nonlinear identification

Experimental study on interaction mechanism of small H-beams and a soil-cement retaining wall

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Journal of China University of Mining and Technology 2008年第1期18卷 149-152页

作者： WANG Suo-rong CAO Bao-fei jiangsu Changzhou Higher vocational School of Construction Changzhou Jiangsu 213016 China jiangying polytechnic college Jiangyin Jiangsu 214400 China

Small H-beams such as the No.14-20 I-steel can be inserted into soil-cement retaining walls to form small H-beam soil-cement compound walls, functioning both as a retaining wall and a cutoff wall for braced structure excavations. Being different from the mixed soil-cement wall （SMW）, the interaction between soil-cement and small H-steel is very good. We have carried out a series of bending experiments on small H-beams in soil-cement model compound beams to study the mechanism of interactions. The results show that the interaction between H-beams and soil-cement is very good, whether the H-beam is single or double. Joint forms of double H-beams at one end have little effect on both the contribution coefficient and on ultimate deflection before cracking. But after cracking, the joint forms greatly affect the contribution coefficient. We conclude that the rigid joint girder for double H-beams is a better choice in oractice.

关键词： small H-steel soil-cement compound beam rigidity contribution coefficient ultimate deflections soil type experi-mental study

Variable step-size adaptive filtering algorithm based on an exponent sin function

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The Journal of China Universities of Posts and Telecommunications 2023年第1期30卷 56-65页

作者： Guan Sihai Cheng Qing Zhao Yong Liu Fangyao college of Electronic and Information Southwest Minzu UniversityChengdu 610225China Sichuan vocational college of Finance and Economics Chengdu 610101China School of Mechanical and Power Engineering Henan Polytechnic UniversityJiaozuo 454003China

This paper proposes a robust adaptive filter based on the exponent sin cost to improve the capability against Gaussian or multiple types of non-Gaussian noises of the adaptive filtering algorithm when dealing with time-varying/time-invariant linear systems function exponent sin(ExpSin).Then a variable step-size(VSS)-ExpSin algorithm is extended ***,the stepsize,the convergence,and the steady-state performance of the proposed algorithm are validated *** Monte Carlo simulation results of linear system identification illustrate the principle and efficiency of this proposed adaptive filtering *** suggest that the proposed adaptive filtering algorithm has superior performance when estimating the unknown linear systems under multiple-types measurement noises.

关键词： adaptive filter the exponent sin function variable step-size time-varying/ time-invariant multiple types of noises

The Application of Fractal to Design Knitted Sweaters

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Journal of Donghua University(English Edition) 2011年第2期28卷 187-189页

作者：陈莉张蕊谢月凤 School of Textiles Tianjin Polytechnic University Key Laboratory of Advanced Textile Composite Ministry of Education Department of Automotive Engineering Tianjin Transportation Vocational College

Pattern design is very important for knitting industry. Fractal theory is adopted to create image automatically, which is applied to design knitted sweaters. Based on Mandelbrot set(M-set), image could be generated automatically by visual basic (VB) program. Plenty of wonderful patterns are created by the following methods: selecting any parts of the image and magnifying, extending generalized M-set, editing the selected images with photoshop. The edited pattern is used to set on any parts of clothes to show fashion effect. Actual knitted structure is simulated by knitting CAD software. The results show that the fractal theory has greater potential applications in knitted pattern design, and it deserves further research.

关键词： fractal theory Mandelbrot set image created automatically application on knitted sweater design

Research on Data Extraction and Analysis of Software Defect in IoT Communication Software

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Computers, Materials & Continua 2020年第11期65卷 1837-1854页

作者： Wenbin Bi Fang Yu Ning Cao Wei Huo Guangsheng Cao Xiuli Han Lili Sun Russell Higgs School of Computer and Software Dalian Neusoft University of InformationDalian116023China School of Information Engineering Qingdao Bin Hai UniversityQingdao266555China School of Internet of Things and Software Technology Wuxi Vocational College of Science and TechnologyWuxi214028China Public Teaching Department Neuedu Software Talent Training SchoolQingdao266000China Public Teaching Department Qingdao Technical CollegeQingdao266555China School of Information Engineering Sanming UniversitySanming365004China School of Mathematics and Statistics University College DublinDublinIreland

Software defect feature selection has problems of feature space dimensionality reduction and large search *** research proposes a defect prediction feature selection framework based on improved shuffled frog leaping algorithm(ISFLA).Using the two-level structure of the framework and the improved hybrid leapfrog algorithm's own advantages,the feature values are sorted,and some features with high correlation are selected to avoid other heuristic algorithms in the defect prediction that are easy to produce local The case where the convergence rate of the optimal or parameter optimization process is relatively *** framework improves generalization of predictions of unknown data samples and enhances the ability to search for features related to learning *** the same time,this framework further reduces the dimension of the feature *** the contrast simulation experiment with other common defect prediction methods,we used the actual test data set to verify the framework for multiple iterations on Internet of Things(IoT)system *** experimental results show that the software defect prediction feature selection framework based on ISFLA is very effective in defect prediction of IoT communication *** framework can save the testing time of IoT communication software,effectively improve the performance of software defect prediction,and ensure the software quality.

关键词： Improved shuffled frog leaping algorithm defect prediction feature selection framework Internet of Things