bluuebunny/crossref_metadata_2025 huggingface dataset:
Regression Analysis of Social Events on Values
Authors: Li Xia , Hao Zeyuan , He Ziyang , Liu Yifang , Wang Dengshan
Published: November 2019

This study uses CFPS (2010) database researching issues related to the formation of values. We use the OLS (Ordinary Least Square) method to identify the long-term effects of this group of values on those who were enrolled in school between 1986 and 1989 and aged between 15 and 22 in two dimensions, the year of birth and the highest degree. Between 1986 and 1989, two large-scale student movements took place in China. Through the use of social survey data at the individual level, the regression found that those affected by the school sentiment were more concerned with social events and less concerned with social relationships.
Multi-face detection based on improved YCbCr color space
Authors: Li E
Published: November 2019

Face recognition has become a popular means of recognition. It is required in image retrieval, video monitoring, entrance and exit control of military bases or other sensitive areas and other occasions. Face recognition has three key steps: face detection, feature extraction and feature matching. Face detection plays an important role in face recognition. Skin color segmentation is an important part of face detection. The traditional skin color modeling rules of YCbCr color space still have some defects, so we made some improvements. We changed the parameters of the conversion matrix used in the conversion from RGB space to YCbCr color space, so that the chosen skin color region is closer to the face skin color region. By this way, the system can detect the face most accurately.
Real-time Recognition Method of The Ship Object Based on Video Image
Authors: Xing Yupeng , Li Xiaojun , Fang Fengtang
Published: November 2019

Target recognition has always been a hot topic in the field of computer vision. In the military field, computer vision has a good application in the research of ship target detection methods based on SAR images, but this type of research is limited to the detection of ship targets, and there is no further identification of ship types. Shipborne tracking radar parasitic TV can obtain clear images of sea surface targets in sea and air background. In order to improve the combat capability of ship combat systems, this paper proposes a video-based ship target recognition method, based on the identification of ship targets. This paper takes the hand-labeled TV video as the research object, and uses the Camshift and Kalman filter to improve the Faster R-CNN calculation framework for the automatic recognition and tracking of the video image ship target in the sea and sky background. The experimental results show that the correct recognition rate of the target model of the ship based on this method is above 90%.
Data Circulation Blockchain Model Construction and Data Access Management
Authors: Liu Yang , Huang Jincheng
Published: November 2019

This paper proposes a controllable Blockchain-based data circulation model. In this model, smart contracts stipulate that data circulation is carried out according to law, and laws and regulations to be followed in data circulation are written into system hardware and software. The supervision and execution of the law is automatically completed by the system. Through the risk assessment of the model, it can be seen that the data circulation Blockchain model has the characteristics of regionalization, security, credibility, collective maintenance, and non-tampering. It is suitable for solving the problem of data sharing and changing the circulation of data. The model promotes the in-depth integration of law and computer technology and promotes the process of legal automation.
An Automatic Recognition Method for Bank Card Number
Authors: Xin Yuanxue , Lin Yuhan , Shi Pengfei , Han Song , Tian Bin
Published: November 2019

With the development of mobile internet, mobile payment has become one of the most popular payment methods. In order to improve work efficiency, reduce labor costs and enhance user experience, the intelligent identification of bank cards is widely used in mobile payment. Conventional optical character recognition (OCR) technology has the problems of low recognition rate when dealing with bank card text with complex background. Thus, a bank card number identification method based on deep learning is proposed. Firstly, the data set is expanded. Then the CRNN algorithms is used and optimized to identify the card number. Some experimental results show that the method have a high recognition rate.
A Study on University Undergraduate Teaching “Cask Effect” by Big Data Technology
Authors: Chen Chen
Published: November 2019

This paper explores the teaching status of different types of undergraduate colleges and universities from the perspective of the investment of teaching funds and the existing teaching problems. The results show that the hierarchical characteristics of the higher education system in China are generalized in undergraduate teaching, and there are significant differences in the teaching resources enjoyed by different types of colleges and universities, which are manifested in the differences in the investment of teaching funds. In addition, there are different “deficiencies” for different types of institutions in the overall school-running resources, the construction of the contingent of teachers, the orientation of talent training. In order to achieve first-class teaching, undergraduate students should recognize the phenomenon of “cask effect” in teaching, strive to break the circle structure of the existing university system, innovate the incentive mechanism of teachers, ease the “academic ratchet”, and clarify the goal and orientation of running a school, so as to achieve the first-class undergraduate education strategic objectives.
Research on Management Uncertainty Solution Based on Environmental Change by big data Technology
Authors: Lixinyu
Published: November 2019

In the development of China’s socialist market economy, there are many environmental uncertainties, which depend on the complexity and variability of the environment. What enterprises need to do is to let management accounting take the initiative to deal with the uncertainty of the environment. In the development of an enterprise, management accounting can strengthen the internal management of the enterprise and improve the economic benefits of the enterprise. It adopts a series of special methods to collect and analyze the enterprise data, and controls the business of the enterprise by forecasting and making plans. Secondly, the competition among enterprises will become more and more competition among supply chains. The competition between supply chains is increasingly inseparable from the research of modern management solutions. On the basis of studying the current situation of supply chain demand uncertainty management, it is proposed to realize the synergy of lean management and flexible management in supply chain management with the concept of collaborative collaboration. Through the analysis of the delicate cooperation mechanism of supply chain, this paper analyzes the uncertainty factors in management accounting and supply chain management based on environmental changes.
Communication signal classification and recognition method based on GA-LSSVM classifier
Authors: Meng QingChuan , Chen Xiaoming , Zhu YuLin , Hu DaYong , Li Rui , Jiang YongTiao
Published: November 2019

In order to recognize signals more efficiently and accurately, this paper proposes a method of communication signal classification and recognition based on GA-LSSVM classifier. Firstly, GA algorithm is used to optimize the penalty factor and kernel function parameters of the two main parameters in the model of support vector machine classifier. By constructing a GA-LSSVM classifier for wireless communication signals, combining with the characteristic parameters of modulated signals, the signals are identified and simulated under different SNR conditions, and the analysis and verification are carried out. The performance of GA-LSSVM classifier is studied. The simulation results show that GA-LSSVM classifier has better recognition and classification performance than other classifiers in different SNR environments, and more than 90% accuracy can be achieved when SNR is greater than 0 dB.
Turtle species identification design based on CNN
Authors: Lu Juncai , Wei Jiangshu
Published: November 2019

In order to realize automatic identification of turtle species, a CNN-based animal identification method based on Tensorflow is proposed. After preprocessing the image, the images are input into CNN for automatic classification and recognition. The accuracy rate is good for the common turtles.
Spending degrees of freedom in a economy & extreme snow depth: a case study of building a model in Tianshan, China
Authors: Wang Wenwen , Zhang Yanwei
Published: November 2019

Serious loss of human life and property by heavy snowfall in many middle and high Xijiang almost every winter. We apply annual maximum snow depth (AMSD) and snowfall data from the Tianshan Snow-cover & Avalanche Research Station (TSAR station in Xinjiang, Northwest China) collected during the last 28 winters (1978 to 2005) to temporal trends of annual maximum snow depth. The goal of the present article is to statistical analysis of extreme values that is applied to snow depth data from Tianshan Snow-cover & Avalanche Research Station. There were no significant differences between socioeconomic of snow depth, under affects socio-economic development from 1961, but permanently snow depth data (1978-2005) showed significantly impact on socio-economic development. Annual maximum snow depth contents necessary to meet return levels for 10, 25, 50, and 100 years of selected quality parameters were estimated. The research shows a decrease in extreme snow depth. This may would need to be increased by the observed decrease in the snow ratio due to increasing air temperatures. Further research is also needed to develop economy systems that socioeconomic and also improve the quality of snow depth data in the study area.
A Novel Quadrupole Mass Filter Based on Rectangular Electrodes
Authors: Jiang Peihe , Mu Penghua , Wang Zhongxun , She Ruyi
Published: November 2019

A low cost and simple geometry quadrupole mass filter was developed, in which rectangular electrodes were employed instead of traditional hyperboloid or cylindrical electrodes. Modeling and simulation were accomplished in COMSOL Multiphysics. The results showed that the performance of novel quadrupole mass filter turned out to be acceptable. For the low cost, simple geometry and easy to be assembled, it had a great prospect in the field of miniature, portable and low-level mass spectrometer.
A Survey on Research of Code Comment Auto Generation
Authors: Zhao Lele , Zhang Liping , Yan Sheng
Published: November 2019

A code comment is an explanation of the code. As an important part of software development process, code comment plays an important role in software maintenance, software reuse and other fields. Automatic generation of code comment aims to study the automatic method of comment generation so as to improve the efficiency of software development. This paper summarizes the related concepts and researches of code comment, discusses the automatic generation technology of code comment and the evaluation of comment quality, introduces the application of code comment generation in the software domain, and finally analyzes the challenges of automatic generation of code comment, and looks forward to the future research in this field.
Binocular Infrared Camera Calibration Based on Calibration Checkerboard
Authors: Wang Ziang , Liu Bingqi , Huang Fuyu , Gao Huawei
Published: November 2019

In this paper, in order to accurately calibrate binocular infrared camera, a method was proposed. It contains a calibration checkerboard based on thermal infrared radiation and the Zhang method. After the calibration experiment, we accurately obtained its internal parameters and stereo parameters. The results show that: the mean reprojection error (MRE) is less than 0.15pixels, and the calibration precision of baseline length reached 0.35%. It proves the effectiveness of the calibration checkerboard and the feasibility of our proposed method.
Corruption in the Selection and Appointment of Civil Servants in Ethnic Areas and Its Countermeasures
Authors: li Feng
Published: November 2019

The selection and appointment of civil servants in ethnic minority areas is an important content and key link in ethnic policy and frontier governance. There are some special regulations on the selection and appointment of civil servants in ethnic minority areas in China, such as the qualifications of academics and candidates. In the process of strengthening the governance of civil servants in ethnic minority areas in China, it was found that the issue of corruption not only seriously affected the construction of the civil service and the credibility of the government, but also caused great damage to the political ecology. Based on this, the article also analyzes the causes of corruption in the selection and appointment of civil servants in ethnic minority areas, and explores ways to improve the selection and appointment mechanism of civil servants.
Dynamic Simulation and Experimental Study of Hydraulic Shift System for Deep Hybrid Transmission
Authors: Zhao Ting-ting , Ma Zhi-tao , Ni Hong-jun , Zhu Peng-wei , Lv Shuai-shuai , Liao Ping
Published: November 2019

The hydraulic shift system of a deep hybrid transmission in a certain model was simulated and tested. First, the basic configuration of the gearbox was introduced. Then, the working principle of the hydraulic source, main oil circuit control system, shifting and parking control system, cooling lubrication system and shifting execution system were explained according to the schematic diagram of the hydraulic shifting system. The dynamic simulation model of hydraulic shift system was established via AMESim. Based on the comparison between the experimental data and the simulation results, the correctness of the model was verified. The dynamic characteristics of the main oil circuit and the shifting element were simulated. The results show that the hydraulic shift system meets the design requirements. The bench test results of powertrain verified the correctness and rationality of the hydraulic shifting system.
Research on Clustering Method of Airborne Threat Target Based on Density
Authors: Fang Fengtang , Li Xiaojun , Xing Yupeng , Wang Yifan
Published: November 2019

In the ship Anti-air warfare defense, situation analysis is an important auxiliary information for combat command. Anti-ship missiles are the main source of airborne threats to ships, not only in terms of speed, but also in the form of missile groups. Based on the improved DBSCAN algorithm, this paper proposes a density-based clustering algorithm. By filtering the input target attributes and optimizing the distance algorithm and the distance radius value, the missile target group can be effectively improved. Based on the identified target group, the situation analysis is further carried out, and the target group attribute calculation method and threat assessment method are proposed to provide support for the operational command.
Research and application of early warning system for abnormal temperature of breeding pigs based on deep learning
Authors: Liu Bowen , Wei Jiangshu , Zhao Shun
Published: November 2019

Based on deep learning, the early warning system for abnormal temperature of pigs can identify suspicious diseased pigs in advance, avoid group death and reduce the loss of a large number of diseases. It includes multi-domain cross-fusion, combining artificial intelligence machine vision image processing technology (CV), Internet of Things information technology (LOT), software engineering technology (STT), and traditional breeding technology (TFT). The CV technology is used for the hip identification and tracking of individual pigs. The LOT technology completes the real-time capture and monitoring of the body temperature of the individual pigs. The STT technology is used to send and receive network messages and implement an early warning system. Combining CV technology, LOT technology, STT technology and STT technology, a solution for automatic monitoring and real-time warning of the temperature measurement area of breeding pigs is proposed and implemented. The paper summarizes the technology used and details the design and implementation process of the system.
Research on Safety Evaluation of Quayside Container Crane Metal Structure Based on 04-FCE
Authors: Zhang Mengya , Huang Chensheng , Chen Kun , Liu Jin , Gan Yan , Zhao Jianyu
Published: November 2019

In order to ensure the safety of quayside container crane in service and improve the port safety management level, from the engineering practice, according to the composition of the quayside container crane metal structure of six parts: the front girders, the rear girders, the beams, the trapezoidal frame, the tie rods, the columns, the factors that potentially have influence on the safety of the metal structure are researched, and the safety evaluation index system is built. The dimensionless algorithm of evaluation index is optimized emphatically. For the first time, the “0-4” evaluation method is used to calculate the weight value in the evaluation algorithm, and the 04-FCE evaluation method which combine the “0-4” scoring method and fuzzy comprehensive evaluation is proposed. The safety level and evaluation conclusion of the quayside container crane metal structure are determined, the suggestions for reducing the risk are given, and the rationality analysis is carried out through an example at last.
Discussion on the Practice of Management and Maintenance of Chemical Machinery Equipment Technology
Authors: Cao Xiaofeng , Zou Shuhui , Xu Juan
Published: November 2019

This paper analyzes the common problems in the process of chemical machinery equipment, including equipment corrosion, equipment scaling, equipment leakage, etc., combined with the management status of chemical machinery equipment technology, and the introduction of advanced operating technology, innovative technology management. Optimization measures such as mode, strengthening talent training management, strengthening supervision and management, and researching the maintenance ideas of chemical machinery equipment technology, aiming at raising people’s awareness of chemical machinery equipment technology and promoting the stable development of the industry economy.
Correlation between parameters of support and thermal conductivity of tempered vacuum insulated glass based on grey system theory
Authors: Zhao Weitong , Hu Dongfang
Published: November 2019

In order to further reduce the thermal conductivity, the correlation between the parameters of support and the thermal conductivity of tempered vacuum insulated glasses was investigated based on grey system theory, and the grey relational values of the parameters of support and the thermal conductivity were obtained. The results show that the grey relational degree between the thermal conductivity and the arrangement of supports is greater than that between the thermal conductivity and the other parameters of support when the samples are produced with the same process and other components, which can provide evidences for further improving the properties of tempered vacuum insulated glass.
Bearing Fault Diagnosis Based on CEEMDAN and Teager Energy Operator
Authors: Jing Xiao , Jianmin Mei , Zhiqiang Zhang , Chun Chang
Published: November 2019

Aiming at the problem that the early shock signal of rolling bearing fault is weak and difficult to extract, a combination of CEEMDAN and Teager energy operator is proposed. Firstly, CEEMDAN decomposition and noise reduction are performed on the original signal, and the most sensitive component is selected according to the correlation coefficient criterion. Then the Teager energy operator is calculated on the component to extract the fault feature. The analysis of the outer ring and inner ring peeling fault signal of the steady speed rolling bearing results shows that the impact component signal can be effectively enhanced, the enhanced fault impact characteristics can be accurately identified from the interference, and the weak bearing fault characteristics can be extracted, which can effectively monitor and troubleshoot the rolling bearing.
Analysis on Ecological Suitability of Land Use Planning in Industrial Park
Authors: Jun Shao , Jiali Yao , Xue Luo
Published: November 2019

In the process of planning and construction of industrial park, it is necessary to analyze the suitability of construction land, and use it as a basis to guide and demonstrate the rationality of planning spatial layout and land use, so as to provide scientific basis for planning decision-making. In this paper, the ecological suitability of land use planning in Tongshan County Economic Development Zone Master Plan is taken as the research object, the planning land use types are combed, the ecological sensitive factors are screened by the method of benefit analysis, the evaluation index system and method system are constructed, the ecological adaptability of industrial park land use is evaluated scientifically, the ecological adaptability of regional land use is determined, the construction land is reasonably planned and the planning is improved.
Research on Cutting Performance Optimization of Diamond Wire Saw
Authors: Feng Jiahao , Liang Huipin , Liu Jianwei , Mao Guanghua
Published: November 2019

Due to the wire sawing machine cutting technology has the advantages of more efficient, safer, higher yield and less pollution than the traditional quarrying method, it has been widely used in the mining of mine stone. In order to better analyze and study this technology, combined with the research progress of domestic and foreign scholars, the wire sawing machine cutting technology has been comprehensively analyzed and summarized. Firstly, the current advanced modular design of the wire sawing machine is introduced. Secondly, the structural innovation of multi-rope wire sawing machine is introduced. The influences of cutting speed and feed rate on the wear of diamond bead rope and the cutting efficiency of wire sawing machine are analyzed. And on the basis of this, the motor is under PID controll to find the optimal speed value, and finally explain its future development.
Research on pressure wave transmission coding and implementation of testing and adjusting system for layered water injection in oilfield
Authors: Cheng Zhihua , Kan Kun , Fan Zijun , Xu Yatian , Gu Chunyuan
Published: November 2019

Based on the communication of pressure wave in layered water injection pipeline, considering energy consumption and time consumption, the binary coding method and time coding method are analyzed and counted. A new improved time coding method which can reduce energy consumption by more than 50% is proposed. It improves the universality of the product and designs, and implemented in a distributed storage measurement and adjustment system.
TOPSIS method of roller coaster evaluation system based on Mahalanobis distance
Authors: Liu Dengfeng , Yu Haixin , Zhu Yaqi
Published: November 2019

Aiming at the problem of roller coaster evaluation, this paper puts forward a method of objective evaluation of roller coaster TOPSIS method based on Mahalanobis distance. The descriptive numerical information of the existing 5124 roller coasters in the world is crawled by using the network crawler technology. According to the TOPSIS algorithm, “The World’s Top Ten Roller Coaster” list is generated and the roller coaster ranking based on roller coaster speed, height, length and inversion number is obtained. By introducing two indexes of information coverage and information difference rate, the roller coaster rating system is compared and discussed horizontally and vertically.
Study on multi-axis simulated NC machining for thin-walled impeller
Authors: Guo Jingjie , Ma Shaojie , Zhang Xiangjin , Wang Kun , Du Jiaxi
Published: November 2019

Thin-walled impellers are widely used in aerospace and other high-end manufacturing industries However, the machining of thin-walled impeller is a difficult problem. In this paper, the simulated NC machining for thin-wall impeller with a wall thickness of 1.8 mm is presented. Firstly, the Three-dimensional model of thin-wall impeller with 18 blades is created in SolidWorks. The multi-axis NC machining processing for impeller includes is divided into four stages: roughing and grooving, finishing blade, finishing hub and finishing fillet. All the tool paths for the above-mentioned processing stages are planned by blade expert module in MasterCAM. The five-axis simulated machining for thin-walled impeller is carried out to detect abnormal phenomena such as tool collision by machine simulation module in MasterCAM. The study can simulate the real processing scene for multi-axis NC machining thin-walled impeller and improve the design of NC processing efficiency.
Dynamic simulation of the passive heave compensator for a strand jack
Authors: Zhan Y , Xu J A , Zheng S L
Published: November 2019

The passive heave compensator for a strand jack unit used in deep sea shipwreck salvage is studied. A dynamic model based on the Lagrange equations is developed, which considers the strand elasticity. Numerical simulations are performed for a range of compensator stiffness, which are determined by the gas volume. Numerical results show that increasing gas volume reduces the stiffness of the compensator, and the resulting displacements of compensator platform and sunken vessels decrease.
Low Stray Inductance Busbar Design and Optimization for SiC-Based Three-Level Device
Authors: gong Zhenzhou , xie Yiting , xu Yunfei , yuan Tingting , wang Laili
Published: November 2019

In this paper, the sensitivity of switching-off voltage spikes of SiC MOSFET and Si IGBT to stray inductance at the same voltage and current levels is compared and analyzed. The influence of the geometric structure of simple stacked busbar on its stray inductance is analyzed and the general guiding principle of busbar design is given. Aimed at the three-level circuit topology involved in this project, based on the analysis of its working principle and commutation circuit, the stray inductance network of stacked busbar is successfully extracted with the help of finite element simulation software ANSYS Q3D, and the idea of optimizing stray inductance of maximum commutation circuit is putted forward. A set of three-level AC-DC-AC power electronic device is designed, and a series of iterative optimization design and optimization results analysis of the busbar of the device are made.
Overlapping citrus segmentation and reconstruction based on Mask R-CNN model and concave region simplification and distance analysis
Authors: Longye Xiong , Zhuo Wang , Haishen Liao , Xilong Kang , Changhui Yang
Published: November 2019

Accurate segmentation and reconstruction of overlapping citrus target contours is the primary problem for picking robots. In view of the poor effect of existing research methods on the segmentation and reconstruction of overlapping citrus fruit target contours under complex background, a segmentation and reconstruction method based on region simplification and distance analysis is proposed. Firstly, the overlapping citrus region (Mask region) is obtained by using the previously trained Mask R-CNN model. Then, the convex hull curve of the region is obtained by the roll-wrapped convex shell algorithm, and the region enclosed by the convex curve and the Mask region are pixel-operated. The concave region is polygon-simplified; then the vertices of the polygon are extracted by the Shi-Tomasi corner detection algorithm, and the contour segmentation points are determined by analysing the distance from each vertex to the contour convex-hub curve. Finally, the segmentation contour is reconstructed by the least squares fitting method. The experimental results show that the average error of the proposed method for the reconstruction of overlapping citrus contours is 3.21%, the non-coincidence degree and time are 4.13% and 0.273s respectively, which superior to RANSAC algorithm and Hough transform algorithm. It can satisfy the recognition requirements of overlapping citrus in natural environment for citrus picking robots.
Transmission mechanism analysis of downhole drive reciprocating pump production system based on rack and pinion
Authors: Yan Wenhui , Zhou Jiangtao , Peng Yong , Xie Dong , Qu Yinan
Published: November 2019

At present, the rod production system is difficult to meet the requirements of directional wells and cluster wells with large slant, the rod and pipe of these pumping wells suffer from serious wear, high energy consumption and low system efficiency. Downhole drive reciprocating pump production system, cancelling the sucker rob for transferring forces and motion, utilizing downhole submersible motor drives the reciprocating pump through the downhole drive mechanism, which can avoid the wear of the rod and pipe and improve the system’s efficiency. The composition and working principle of downhole drive reciprocating pump production system are introduced. The scheme of downhole drive reciprocating pump production system based on rack and pinion drive is analyzed in detail. The dynamic model of rack and pinion is established. By the dynamic simulation of the downhole transmission mechanism, the vibration loads of the mechanism with start up different accelerations are analyzed, and it is concluded that it is better to start with the variable acceleration. The scheme can reduce the vibration load caused by the motion inertia to the mechanism and improve the service life of the whole oil production system.
Analysis of Factors Affecting the Working Performance of Brush slip ring system in Special Environment
Authors: Zhao Shuai , Ma Hongzhong , Chen Zhenfei , Jiang Mengyao , Li Xiujin , Liu Yidan , Chen Xuan , Zhang Xianghu
Published: November 2019

In the marine environment, the wear of carbon brushes in the brush slip ring system of doubly-fed generators is accelerated and the replacement frequency is relatively high. In this paper, an experimental platform is built to simulate the working environment of the carbon brush slip ring system in the marine environment, and the factors causing the accelerated wear of carbon brushes are explored, so as to make suggestions on operation and maintenance of the brush slip ring system. The composition of the oxidation film on the contact surface of the brush slip ring has been quantitatively analyzed to provide a basis for determining the content of the oxidation film.
Review and Future of Aircraft’s Propulsion Type
Authors: Yi Yujie
Published: November 2019

The development of future aerospace propulsion technology, represented by the new aero-engine technology, will meet people’s higher requirements for safety, reliability, environmental adaptability and affordability. This paper mainly introduces the current mainly using propulsion types and future propulsion types. And analysis characteristics, research progress and development trend of the possible future propulsion types.
Mechanical resonance suppression method of Naval Gun servo control system based on Notch Filter
Authors: Liang Simeng , Cai Jie , Cheng Shouhu
Published: November 2019

The naval gun servo system requires high dynamic tracking accuracy. In addition, the resonance point of the system changes at any time due to the influence of sea weather and wind waves. Therefore, the traditional off-line detection method of resonance point is not suitable for naval gun servo system. According to the characteristics of naval gun servo system, an on-line resonance suppression method based on notch filter is designed in this paper. The resonance frequency point is detected by fast Fourier transform, and then the notch filter is adjusted on-line parameters. The simulation results show that this method can suppress the resonance problem of naval gun servo system on line.
Design of ship exhaust gas desulfurization control system based on S7-1500 PLC
Authors: Yin Qi , Shreka Majed , Gao Ruifeng , Zhu Yunlong
Published: November 2019

In this paper, an exhaust gas desulfurization control system for the ship was designed based on the sodium-alkali desulfurization system. The control system composed of the process control and the monitoring system. Besides, Siemens S7-1500PLC was used to realize the process control. Moreover, the monitoring system consisted of the machine side touch screen and the remote host computer, which provided the real-time monitoring of the system. Furthermore, the main functions of the system were introduced and the design points were given. Eventually, the system had a good functional performance and achieved the expected control objectives after the control system debugging.
Dynamical Analysis and Simulation for a T chaotic System with Single Delay
Authors: Hai-yan Fu , Teng-fei Lei
Published: November 2019

In this paper, a single delay T chaotic system is constructed by adding a delay term according to the dynamic equation of T chaotic system. The bifurcation diagram, complexity, 0-1 test and phase diagram of the system are analyzed by Matlab, thus showing the sensitivity of the new chaotic system to system parameters. Finally, in order to further study the influence of the change of two parameters on the system, the bifurcation space diagram is used to analyze the system dynamics, thus further revealing the realizability and chaotic characteristics of the system.
AGC Performance Analysis of Thermal Power Unit Based on Characteristics of Steam Turbine Valve
Authors: Gao Song , Sun Mengmeng , Han Yingkun , Li Yuanyuan , Yu Qingbin , Yan Qing , Liu Enren
Published: November 2019

Maintaining the balance between real-time generation and load is one of the important tasks of power system. Automatic generation control (AGC) is an important part of power grid frequency control, so grid-connected thermal power units must have good AGC performance. Many factors may cause the AGC regulation performance of generating units to fail to meet the requirements, such as unreasonable system design, imperfect control strategy, poor equipment characteristics and so on. This paper introduces the performance index of thermal power units participating in AGC regulation and analyses the influence of flow characteristics of steam turbine valves on AGC performance. By optimizing the steam turbine valve management function, the performance can be effectively improved. The effectiveness of this method is verified by its implementation on a typical 300 MW thermal power unit.
Research on precision assembly error statistics and sensitivity based on vertical launcher model
Authors: Lei Xiaobo , He Chaoxun , Liu Junzhou , Fu Nianli
Published: November 2019

The installation accuracy of the shipborne vertical launcher and the different state parameters of the launcher’s guide rail will have different degrees of impact on the initial accuracy of the test-mounted missile. Therefore, it is of great practical significance to study the assembly error characteristics of the launcher. In this paper, the influence law of equipment installation accuracy and the influence of each component’s correlation error on assembly precision are analysed. The error law of the launching device is analysed based on mathematical statistics. At the same time, the sensitivity of the error is studied by multi-body theory method to improve the accuracy, efficiency and stability of the assembly. Through the established error sensitivity analysis model, the geometric error of the main components that have a great influence on the assembly accuracy during the assembly process of the launching device is effectively identified. The results show that the error data probability distribution of the vertical launcher conforms to the normal distribution, and the key factors of the assembly error are effectively detected, which provides a theoretical basis for the assembly precision control research.
A Design of Wide-range Frequency-tracking Ultrasonic Power Supply
Authors: Fu Yu , Fu Tie , Wang Aimin
Published: November 2019

Aiming at the problem that the frequency tracking range of commercial ultrasonic power supply on the market is narrow, which makes the load of ultrasonic power supply, a structure of transducer-horn-tool, difficult to match. This paper presents a kind of ultrasonic power supply based on TMS320F28335, which can track the frequency in a wide range(15-21kHz). The advantages, theory, software and hardware structure of the power supply are introduced, which can realize the functions of wide range frequency tracking, power regulation, human-computer interaction and so on. Experiments show that the power supply can well match the ultrasonic vibration load with a wide range of resonant frequencies, and has good human-computer interaction function.
Research and Application of Question Answering System Based on Subject Knowledge Base
Authors: Chen Yuyong
Published: November 2019

The intelligent subject knowledge base question-and-answer system has a positive effect on improving the self-learning ability of the students, and designs a subject knowledge base question-and-answer system based on man-machine interaction. The system design includes the design of the question and answer algorithm of the subject knowledge base and the software development and design of the system. The semantic ontology structure mapping method is adopted to control the semantic information in the question-and-answer process of the subject knowledge base, and the expert subject knowledge base is constructed. The semantic concept tree analysis is carried out in combination with the feature construction method of the subject word feature, the human-computer interaction design of a subject knowledge base question-and-answer system is carried out by adopting a networked information interaction mode, and a corpus of words, phrases and sentences of a subject knowledge base question-and-answer system is constructed, in that concept of the semantic subject word, the sentence division of the question and answer of the subject knowledge base is realized, and the subject word characteristic matching method is adopted to realize the algorithm design of the network subject knowledge base question and answer, and the intelligence of the question and answer of the subject knowledge base is improved. In the embedded industrial control host, the system development and human-computer interaction design of the subject knowledge base are carried out, and the system is mainly composed of an information processing module, a subject knowledge base information acquisition module, a DMA controller, an output module and the like. The test results show that the system can effectively realize the question-and-answer of the network subject knowledge base and improve the reliability and intelligence of the subject-and-answer system of the subject knowledge base.
Airborne gateway: key technology of earth observation system in the space-air-ground integration network
Authors: Hao Zeng , Linjun Qian
Published: November 2019

In traditional system of remote-sensing emergency services in space-air-ground integration network, the existing units of earth observation system operate independently from each other, the rate of data transmission and process can not meet the requirements, which makes the efficient actions taken after at least ten hours of the emergency. This has become a bottleneck for effectively responding to emergency events. The airborne gateway is the key technology to break through this bottleneck. The result of the rate test shows that our airborne gateway rate has reached 937M/s. Besides, it can also effectively detect moving target after preprocess. With the gateway, the three independent units are connected to a network, which works well and improves the efficiency of data processing and shorten the response time.
An approach for integrity assurance in Time-triggered Ethernet
Authors: Chen Pengyu , Li Zhaobin , Lian Weichen
Published: November 2019

In communication systems, integrity is the ability of a system to detect faults and achieve a fail-safe state during operation, and is one of the important attributes of credibility. Currently, there is no effective integrity assurance mechanism in Time-Triggered Ethernet (TTE). This paper combines the principles of cryptography, designs TTE switch with integrity guarantee mechanism, and builds a simulation platform to verify the design implementation. The simulation results show that the mechanism effectively implements the data integrity guarantee of TTE and improves the reliability of the TTE system.
PAPR Reduction of Multicarrier Faster-than-Nyquist Signaling by PTS Based on Tree
Authors: Cai Biao , Liu Aijun , Gao Chao , Liang Xiaohu
Published: November 2019

One of the common drawbacks of multicarrier communication systems is high peak-to-average power ratio (PAPR). Duo to the overlapped structure of multicarrier faster-than-Nyquist (MFTN) signaling, conventional PAPR reduction methods show poor performance. In this paper, we investigate the PAPR reduction of MFTN signaling. Specifically, as one of the most attractive methods, partial transmit sequence (PTS) method is exploited in MFTN signaling system. First, PTS method is combined with alternative signal (AS) to overcome the overlapped structure of MFTN signaling. Then, a tree based PTS method combined with AS is proposed, and all the candidate signal sequences can be generated by adding the difference signal sequence on the last candidate signal sequence, which can reduce the computational complexity significantly. Simulation results show that the proposed method does not have performance degradation on PAPR reduction.
Low cost intelligent household design based on Modbus/RTU protocol
Authors: Li Xinyang
Published: November 2019

Concerning about the fact that the quality of citizen’s daily life is improving in recent time, the construction of smart home has become as mainstream. We designed the intelligent household control system which achieved the muti-device communication through Modbus/RTU protocol, including the master device (AT89C51 singlechip), and the slave device. The master device took interrupt mode to send and receive data and realized the function that the slave device could receive, process, framing and send out the messages by adopting modular programming. The conflict of electrical level because of muti-device communication was solved effectively by designing the matched communication interface according to the Modbus protocol. This system has been tested to be useful and stable in basic control for intelligent household device. It can be easily achieved, duplicated and transplanted due to its minimal and low cost design.
Research Progress of Construction of Smart Campus
Authors: Yu Jiujiu , Zhang Jishan , Pan Liqiong , Yu Chunyan , Qi Hui
Published: November 2019

Smart campus is a new stage in the development of educational informatization. Focusing on present construction situation of smart campus in universities in China and abroad, the paper firstly reviews of typical construction modes, types of design architecture and major functional modules of smart campus in universities. Secondly, from the perspective of application, service and management for smart education, some key technologies of construction of smart campus in universities are analyzed and summarized. Finally, further work of promoting the construction standards and evaluation of smart campus, training and improving the big data literacy for teachers and students in campus, and exploring effectively on sharing and constructing mechanism on smart campus for local application-oriented universities is expected in this paper.
Research and design of system security based on .NET frame
Authors: Zhou Jing , Guan Yurong , Zhou Fei
Published: November 2019

For using the .NET framework model of Web application system for Web development to some security problems in the analysis and discussion, this paper put forward some security prevention programs, though. The .NET framework system itself has some security protection mechanism, but users in developing Web mode when the application is to avoid safe hidden trouble, should be more reliable in every link of security Settings.
Exploration of Modular Teaching Model for Environmental Art Design Specialty in Information Age
Authors: Zhe Zhang , Wang Qinghai , Xing Yadan
Published: November 2019

In the information age, the current teaching situation of environmental art design is not optimistic. There are many reasons for this phenomenon. In addition to the traditional inherent factors, the more important thing is that there is no basic teaching evaluation system and teaching model reference in environmental art design education. Based on the characteristics of the information age, this paper studies and establishes new rules of teaching design of environmental art design, and designs a teaching model of environmental art design.
Research on Topic Mining Algorithm Based on Deep Learning Extension
Authors: Yang Fuqiang , Zhao Xuechen , Zhang Maohong
Published: November 2019

This paper proposes a new algorithm that can consider both keywords and time of occurrence. Firstly, after the data is preprocessed, the LDA model of the theme event set is established, and the set of subject words is generated as the description mark of the event. The semantic and temporal similarity between the event keywords are calculated by the DTW algorithm to obtain the corresponding similarity matrix. Finally, the collaborative training method is used to iteratively generate the final feature vector and complete the event selection. The simulation results show that the proposed algorithm has higher accuracy and higher efficiency than previous algorithms.
Research on equipment life cycle information management
Authors: Qi Jiandong , Qi Jiandong
Published: November 2019

At the beginning of this century, with the rapid development of information technology and the high technology of weapons and equipment, the traditional management model can no longer meet the current and future development needs of equipment construction. It is urgent to establish an information management system to improve the life cycle of equipment. This paper explores the life cycle information management model of equipment from many perspectives and levels, such as equipment management at home and abroad, equipment information management analysis, basic principles of equipment information management construction, system technology platform, system development and so on.
Application of Improved Non-local Mean Filtering Algorithm in Detection of Oil and Gas Wells
Authors: Cuan Ying , Wang Sijie , Han Jiaxin
Published: November 2019

As the oil and gas exploration in most parts of China has entered into the middle and late stages, the aging and wear problems of mining equipment have become increasingly prominent. In the process of visual image acquisition of oil and gas well casing damage, due to the influence of the complex environment of light and dust, the image data source noise is serious, and the image recognition model has low accuracy. This paper improves the neighbourhood filtering algorithm block search process with the ant colony pheromone correlation theory, optimizes the block matching process with the Pearson algorithm, and eventually applies the optimized non-local mean filtering algorithm to the oil and gas well casing damage visual detection process. The experimental results show that the improved non-local mean filtering algorithm has a significant impact on the adaptability and effectiveness of the noise reduction effect.