bluuebunny/crossref_metadata_2025_split huggingface dataset:
Simulation and implementation of DPWM algorithm for NPC three-level inverter
Authors: Hang Xia , Jie Zhang 
Published: November 2019

Abstract
The application of discontinuous pulse width modulation (DPWM) in high-power inverters can effectively improve the equivalent switching frequency of the inverter and improve the control performance of the system. In this paper, the DPWM3 algorithm of NPC type three-level inverter is researched in detail from the judgment of the sector where the reference vector is located, the calculation of the action time of the space vector, and the selection of the switching sequence. Finally, simulation and experimental results verify the rationality of the proposed algorithm. It provides a certain reference value for the research of NPC three-level inverter discontinuous pulse width modulation algorithm.
Research on Standard System Architecture of Metrology Technology for Energy Interconnection*
Authors: Shuming Shen , Yongjia Zhou , Yongjin Xu , Xunan Ding , Xiqiang Song , Pingping Wang 
Published: November 2019

Abstract
Based on the strategic goal of building the world-class energy internet enterprise in China, combined with the important content of widespread power internet of things, it analyzed the new demand and development direction of the metrology technology under the new situation. A kind of measurement standard architecture that can support the energy internet need is proposed based on the existing measurement system architecture, the contents of relevant standards that need to be revised or added in each layer of the system (device layer, communication layer, interoperability layer, security layer, system layer) are specifically studied, which provides guidance for the promotion and revision work of relevant standards, promotes industrial technological innovation, and supports industrial optimization and upgrading.
Storage Reliability and Safety Analysis of SLMs
Authors: Wang Shaolei , Zhou Yuan , Xu Jianguo , Chen Chen 
Published: November 2019

Abstract
Based on the analysis of the factors of ship storage environment which have adverse effects on the reliability and safety of missile storage, the design scheme of missile storage environment monitoring and control system in missile cabin is put forward. Through on-line monitoring of missile cabin environment monitoring system, the safety of missile and the storage reliability of missile can be guaranteed.
Prediction of Virtual Machine State Based on BP Neural Network
Authors: Li Jian Ping , Sun RuiNan 
Published: November 2019

Abstract
Monitoring software for kernel-level rootkit malware in the cloud computing environment has been relatively perfect. However, these monitors can only ensure the security of virtual machines in the cloud environment, but cannot make a more accurate judgment on the future state of virtual machines. Kernel virtual machine for cloud computing environment safety status of prediction is affected by the impact factors of nonlinear, the traditional forecasting model is based on statistical methods, although dynamic allocation model can be used for the prediction, t the ability to overcome the non-linear influence is poorer, predicted results already can not meet the accuracy requirement of the Internet of things. In order to more accurately predict the cloud computing environment of virtual machine core security status in the future, based on the BP neural network in the virtual machine future state prediction model, and through factor analysis and factor analysis results normalized processing to reduce the size of the input data of BP neural network, the neural and network prediction time. Finally, by processing and simulating the data obtained by libvirt program, the feasibility of the model is verified. It can be seen that the model has a good prediction effect on the future state of the virtual machine.
Virtual simulation of zero-point alignment for industrial robots
Authors: Wang Yanwu , Shen Bin , Li Longteng 
Published: November 2019

Abstract
Zero-position regulation training is a compulsory course for industrial robot training. Generally, the zero-point regulation of industrial robots was completed by beginners through the actual equipment. However, the training based on practical equipment was restricted by training venues, training scale, and equipment reliability. It can’t satisfy the requirements of actual training. A wider training environment of robots was provided by the technology of virtual simulation in this paper. And the problems of complex equipment and expensive price in the practical process can be solved effectively. Virtual simulation of zero alignment of Kuka industrial robot is an important subject. The performance of trajectory planning and kinematics were studied. And the accuracy was verified in the paper. This paper gives A brief description of zero alignment were assumed by the paper. A three-dimensional model of Kuka industrial robot was built by SolidWorks, 3DMax and other three-dimensional software Its main characteristics were analysed based on the 3D model. And the zero alignment of Kuka industrial robot was simulated by the virtual reality software. In addition, the virtual simulation environment and the main function of the system were constructed. The project was debugged at last.
High-precision magnetic encoder module design based on real-time error compensation algorithm
Authors: Shen Hongcai , Wang Mingjiang 
Published: November 2019

Abstract
The continuous development of industrial automation requires more and more control precision for automated control systems. As a key component of the servo motor control system, the encoder has a great influence on the accuracy of the control system. Although the common photoelectric encoder has relatively high precision, its control structure is limited by these unfavorable external environments due to its complicated structure, difficulty in integration, and vulnerability to external environments such as dust, oil, water vapor, and vibration. A high-precision magnetic encoder design based on error compensation algorithm proposed in this paper can not only effectively overcomes the influence of these unfavorable conditions, but also introduces an error compensation algorithm based on ordinary magnetic encoder, which can be compared with ordinary magnetic encoder. The encoder has higher position feedback accuracy and greater stability. it can provide position information with real-time error not exceeding 0.2° within general industrial servo motor speed range. The high-precision magnetic encoder module has low cost, simple structure and easy integration, and also has considerable practical value in the field of industrial automation.
Information acquisition of anterior branches of fruit based on Mask R-CNN
Authors: Zhuo Wang , Longye Xiong , Haishen Liao , Xilong Kang , Changhui Yang 
Published: November 2019

Abstract
In order to obtain the deflection information of the anterior branch to enable the end effector to perform citrus picking in the correct posture, this paper proposes a method based on Mask R-CNN model and centroid estimation for pre-fruit branch deflection information acquisition. The method marks the front of the fruit branches by means of a rectangular-like marking method, and completes the identification of the pre-fruit branches with random posture. The ROI is obtained by the discrete mask obtained for the model, The ROI area is equally divided into two sub-areas for centroid extraction, At last, The two centroids obtained are used to calculate the deflection angle of the fruiting branches. The experimental results show that the recognition accuracy of the model under the test set is 96.44%, the average recall rate is 80.71%, the average deviation of the deflection angle of the pre-fruit branches is 7.4°, and the maximum deviation of the angle is 12°.
Algorithm Research and Hardware Implementation of High Precision Floating Point Exponential Function
Authors: Zou Xiafeng , Wang Mingjiang 
Published: November 2019

Abstract
Exponential function is of great significance for high-precision calculation in computer technology. The study of exponential function plays a very important role in modern communication and signal processing. With the rapid increase of the number of digits in computer computing, the fixed-point representation range is small and limited in practical applications. The floating-point number indicates a wide range of teaching and has a wider range of applications. Therefore, the research direction of this article is the hardware algorithm research and implementation of high-precision floating-point exponential function. The goal is to implement the 64-bit high-precision exponential function hardware implementation in accordance with IEEE754 standard. In this paper, the vector mode in the CORDIC algorithm is used to improve the efficiency of the algorithm by improving the iterative method. The 64-bit floating-point exponential function operation is realized by FPGA, and the accuracy is achieved when compared with the PYTHON operation result.
Comparative Study of Sliding Window Multifractal Detrended Fluctuation Analysis and Multifractal Moving Average Algorithm
Authors: Lai Simin , Wan Li , Zeng Xingjian 
Published: November 2019

Abstract
Sliding window multifractal detrended fluctuation analysis (W-MFDFA) and multifractal moving average detrended method (MFDMA) are two effective methods to study multifractal characteristics of nonstationary time series. Taking the typical BMS signal model as an example, the selection of parameters, calculation accuracy and noise effects of the two algorithms are analyzed and compared. The results show that the calculation accuracy of MFDMA is better than that of W-MFDFA, but the latter is not sensitive to the changes of parameters, and has stronger anti-interference ability to noise and better stability. It can provide valuable reference for the research of actual data and the selection of internal parameters of the algorithm.
Numerical Calculation Method of EHV/UHV AC Corona Loss Based on Streamer Theory
Authors: Hu Lei , Pan Wenxia , Li Yi , Yang Wei 
Published: November 2019

Abstract
For the selection and design of Ultra/Ultra High Voltage (EHV/UHV) transmission lines, the calculation of corona losses is very important content of the research. A numerical calculation method of corona losses of EHV/UHV alternating current (AC) transmission lines based on streamer theory is proposed in this paper. In this method, Peek’s formula is not used to calculate the corona onset electric field. Instead, the corona onset electric field is calculated from the physical process of corona production on the surface of the line, and the influence of raindrops on the corona onset electric field is considered according to the law of deformation of raindrops in the electric field. After the corona onset electric field was obtained, corona losses of the wire can be obtained by calculating the ion flow field of the bundled conductors. The result of the example shows that the calculation result of this method is accurate relatively compared with the measured values. The calculation method of this paper has certain practical application value for the calculation and study of EHV/UHV AC corona loss in rainy days.
A Study on Control Algorithm for Robots with Multi-degree of Freedom
Authors: Lan Kexin 
Published: November 2019

Abstract
Robotics, a synthetic discipline developed in recent years, is the advanced hot spot of academic research at present. As the important branch of robots, robots with multi-degree of freedom are similar with human beings in intelligence, behaviors and appearance. A robot with multi-degree of freedom can imitate some simple movements of human beings. This kind of robot has many joints and a complex control circuit, and if it owns some functions human beings do not have, its control circuit will be more complex. In this thesis, the model for dynamics of robots with multi-degree of freedom is built based on lagrangian function, and the control law of robots with multi-degree of freedom is designed. Additionally, in Matlab, the numerical model of robots with six degrees of freedom is built according to the method of Joint-link parametric, which verifies the correctness of parametric of robots and the kinematic formula.
Research on Spatial Conceptual Modeling of Natural Language Processing Based on Deep Learning Algorithms
Authors: Wang Jiaqi 
Published: November 2019

Abstract
From the point of view of computer science, especially artificial intelligence, the task of natural language understanding is to establish a computer model. This computer model can give the result of understanding natural language like human. An important aspect of natural language understanding lies in how to express knowledge to the computer, how to express knowledge, and how to establish the connection and reasoning between knowledge, that is, how to apply the brain’s association, reasoning and selection process to the model of language processing. The physical structure and logical structure of modern computers are very clear, but what we need is a set of feasible formal thinking mechanism to enable machines to process natural language information. Deep learning is one of the areas of machine learning that is close to AI. It is analyzed by simulating human brain learning nerves. Deep learning is derived from the study of artificial neural networks and is a structure for learning deep nonlinear networks. By presenting complex function approximations, the input data is distributed and represented, and the ability of the data samples to focus on the essential characteristics of the data set is revealed.
Research on Testability Index Allocation in Smart Substation Digital Metering System Based on Fuzzy Comprehensive Evaluation
Authors: Huang Tianfu , Wu Zhiwu , Guo Zhiwei , Wang Chunguang , Wu Xiang , Sun Mingwei 
Published: November 2019

Abstract
The digital metering system has certain advantages in comparison with traditional metering systems in principle and performance, but the engineering application time is short. At present, there is a lack of research on the testability of digital metering systems. Reasonable determination of testability index allocation is an important issue to be addressed in the test requirements of digital systems. In this paper, the fuzzy comprehensive evaluation method is used to distribute the test index of smart substation system, which makes it more realistic. It can reflect the whole process of test distribution objectively and truly. Finally, combining with the communication network subsystem of substation, the proposed method is used to verify the testability distribution method, which shows that the method is feasible and effective.
Improved SLAM closed-loop detection algorithm based on DBoW2
Authors: Zhang Qingsong , Xu Guanghui , Li Na 
Published: November 2019

Abstract
In order to solve the problems of dbow2-based closed-loop detection algorithm, it is necessary to determine the appropriate level of dictionary tree and K value of clustering algorithm according to experience in advance. First, the new algorithm obtains the initial image feature clustering of training set by k-means ++ algorithm within the search range of cluster number (H, L). Secondly, by merging the form of similar classes, the cluster number is gradually reduced until the CRI function converges. Finally, the clustering value at this point is the best clustering value adopted by the training set to train the dictionary tree, and the clustering is repeated until the complete dictionary tree is generated. The feasibility of this algorithm is verified through experimental analysis, and the new method proposed can solve the problem of dictionary tree generation of training sets under different backgrounds, which plays a very important role in closed-loop detection based on visual image similarity detection, and has certain theoretical and practical reference value.
Detection of weak Modulation signal by Digital Phase-locked Amplifier
Authors: Weiming Wang , Shengyuan Mao , Xiangdong Luo 
Published: November 2019

Abstract
In the signal detection of two-dimensional material light modulation spectrum, the modulation signal is very weak and often submerged in the noise, so it is difficult to detect the modulation signal in the research. In order to detect weak modulation signals, according to the principle of digital phase lock amplification, this paper realizes the orthogonal digital phase lock method in MATLAB, and studies the extraction of modulation signals in the optical modulation spectrum. The results show that when the average noise is 20 μV, the digital phase-locked amplifier can effectively extract the modulation signal of 1 μV. When the amplitude, phase and type of modulation signal change, the extraction of modulation signal will not be affected.
Research on Intelligent Remote Physical Education Teaching System
Authors: Li Junhong 
Published: November 2019

Abstract
The current intelligent physical education teaching remote system has a certain gap from the whole to the physical education, on the one hand, the function of the long-distance teaching system is not fully exerted, and on the other hand, the teaching quality of the long-distance sports is affected. In addition, the traditional remote sports teaching system has the problems of intelligence, poor individuation and lack of interactive means. According to the need of physical education, based on the agent technology, the intelligent and remote physical education teaching system, the intelligent and the individuation of the long-distance education system are designed, and the teaching effect of physical education is improved.
Research on LDPC Coding Cooperative System Based on Intelligent Joint Iterative Decoding
Authors: He Yifeng , Rong Guozhi , Duan Zhemin , Li Xin 
Published: November 2019

Abstract
Gain of multi-relay coding cooperation. As the number of joint iterations increases, the bit error rate performance increases rapidly, which is significantly better than the coding non-cooperative system under the same conditions. The source output should be represented with as few binary digits as possible. Various noises and interferences in the channel are the main causes of bit errors in digital communication system receivers. Collaborative technology can improve the performance of the system without significantly increasing the system bandwidth or increasing the transmit power, and has attracted more and more attention in the academic and engineering fields.
Design of Multimedia Interactive Courseware Based on Flash
Authors: Hu Xiaowei 
Published: November 2019

Abstract
As an advanced computer-assisted instruction teaching methods, its flexibility, intuitive, real-time, three-dimensional advantages, more and more by the majority of teachers and students of all ages. To make good use of computer-assisted instruction in this modern teaching methods, the key is to design and manufacture to meet the teaching requirements of multimedia courseware. Multimedia courseware is used to assist teachers in teaching tools, creative people based on their creativity, starting with general information on the classification of the organization, then the text, images, animation, audio, video and other media clips in both time and space integration, so that they blend and give them the interactive features to produce a variety of colourful multimedia educational software.
Research on the Mashup Behavior and Evolutionary Patterns of Enterprises in an Incomplete Information Environments
Authors: Fu Jing 
Published: November 2019

Abstract
Starting from the actual background of building industry KB (knowledge base) process of mashup, this paper concerned the influence of bounded rationality and made the usage of an evolutionary game model. Based on prior work, this paper has constructed two different types of asymmetrical core competences of enterprises by anticipated additional net payoff, net partition coefficient, preparation costs and mutation probability and other factors. First, the “prisoner’s dilemma” problem came out. Second this paper do static analysis of non-cooperative game and then seek the ESS (Evolutionary Stable Strategy, ESS) of evolutionary game model. Ultimately, the evolutionary paths are analyzed from the perspective on spatial dimension and time dimension of mashup. At last but not least, a series of corresponding management enlightenments are given out based on the above analysis.
Framework of Software Testing Based on Cloud Computing
Authors: Yuan Haigen , Li Hongli 
Published: November 2019

Abstract
For the problem that efficiency is low and cost is high existing in the traditional software testing method, this paper tested software using cloud testing technology. It introduced related technologies including cloud testing, and described the design of overall architecture for the system in details, designed and implemented the scheduling module using a high priority first scheduling based on dynamic priority. The MATLAB simulation results are that the total turnaround time of the scheduling algorithm in this paper is short when the same tasks are scheduled and increase slowly when the number of tasks is increased than traditional FCFS. This shows that this scheduling algorithm could reduce test cost and realize the automation of software testing under the condition of significantly improving test efficiency and resource utilization.
RETRACTED: Research on the Construction and Service Mode of Digital Library Based On Cloud Computing
Authors: Zhou Donghua 
Published: November 2019

Abstract
Cloud computing is a data processing process based on the transmission capacity of the Internet, and it provides a certain development opportunity for the construction of digital library at the current stage through the information transformation between the relevant servers of the personal computer and the Internet computing cluster. In this paper, starting from the concept of cloud computing technology, and then discusses the problem of cloud computing technology in the library application, so as to promote the quality of cloud computing technology in the library application.
Discussion on 3D Visualization Model of Geological structure
Authors: Ming-li Bi , Xiao-gang Xue , Cai-hong Li , Guo-qiang Chen 
Published: November 2019

Abstract
This is the basis of the formation of the whole 3D geological model. The geological structure surface model subsystem is mainly based on the geological structure surface data provided by the borehole and the virtual borehole. The Delaunay triangulation algorithm is used to construct the TIN model to fit the geometric structural surfaces of various geological objects, such as stratigraphic interface and fault plane. 3D visualization modeling of geological structure is a complex problem, which needs to be explored continuously. The research and application show that the idea of 3D geological modeling based on GOCAD breaks through the limitation of two-dimensional representation of complex terrain surface and underground structure. A more intuitionistic and accurate 3D geological model is provided, which meets the practical requirements and is gradually popularized in application.