bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on the Difficulty Points Marking System of Online Learning Process
Authors: Daxiong Luo , Zhujun Ye , Yi Yu , Xiaoli Zhao 
Published: August 2019

Abstract
There exists a notable problem in MOOCs that teachers can’t find the difficulties during the learners’ learning process because of their inefficiency of supervising the learners’ real learning status. To solve this problem, we model the learning behavior of online learners based on facial expression information and mouse track data, and propose a method for marking learner’s difficulties in online learning process based on machine learning. At same time, we design and implement a prototype system for marking difficulties based on our method. Experiments show that our method can improve the efficiency and quality of marking learner’s difficulties effectively.
Construction safety education system based on virtual reality
Authors: Bin Feng , Xi Zhao , Yi Chen , Ping Wang Gui 
Published: August 2019

Abstract
In view of the shortage of traditional construction safety education in China, this paper introduces virtual reality technology into the field of safety education. The virtual reality construction safety training system designed allows multiple experiencers to be physically, visually and tactfully present at the same time. In the virtual scene of construction accident safety hazard, the experiencer completes the consciousness migration that corresponds the virtual scene to the real scene, thereby avoiding the safety accident in the real construction and maximizing the safety education effect. The overall architecture of this work includes the virtual reality system and the vibration system. The scene model in the virtual reality system is mainly 3D modeling with 3Dmax, and the Unity game engine is used for animation and interaction design. Because the system is mainly for traffic construction and construction units, the design scene mainly includes three major parts: bridge construction scene, road construction scene and tunnel construction scene. The vibrating system is designed to enhance the virtual experience. The system communicates with the host to acquire the corresponding vibration signal and drive six low-frequency vibrating horns, so that the experiencer have a strong sense of vibration.
A Study of the Chinese spam Classification with Doc2vec and CNN
Authors: Gong Hechen , You Fucheng , Wang Shaomei 
Published: August 2019

Abstract
Convolution neural network is a kind of neural network, which has been proved to be very effective in image recognition and classification. In recent years, convolution neural networks have gradually shifted to the field of natural language processing and become one of the research hotspots. For the construction of word vector text using convolution neural network, only considering the relationship between word granularity level, not considering the relationship between words, nor considering the relationship between semantics, affecting the classification results. In this paper, a method based on Doc2vec and CNN is proposed to classify spam. Firstly, the spam is preprocessed, then the sentence vectors and word vectors of Chinese text are trained by Doc2vec, and finally the trained text vectors are classified by convolution neural network.
Design of Marine Automatic Leakage Stoppage System Based on Artificial Eddy Current
Authors: Xin Guipeng , Cheng Zhaoxi , Gao Chengfeng 
Published: August 2019

Abstract
This paper analyses the problems existing in the traditional methods of blocking leakage of ships, breaking through the ideological framework of “blocking” only. The design of ship automatic leak stoppage equipment based on artificial eddy current is put forward, and the experimental verification is carried out. The whole leak stoppage system is designed from the idea of automatic control. The experimental results show that the method can greatly reduce the pressure of seawater on the break and the water inflow per unit time by artificially forming local high-speed eddy flow field at the appropriate position outside the break, thus creating favorable conditions for the plugging of the break in the cabin. The research conclusion can enrich and perfect the method of blocking leakage for ships.
Promoting the Leadership of Grass-roots Party Organizations in the Strategy of Rural Revitalization in the Big Data Era
Authors: Liao Xiaodong , Liu Xiaoping , Feng Feng 
Published: August 2019

Abstract
The report of the Nineteenth National Congress of the Communist Party of China emphasizes the role of grass-roots Party organizations as fortresses. In the era of big data, when implementing the strategy of rural revitalization, new requirements are put forward for grass-roots Party organizations in underdeveloped areas. Grass-roots Party organizations are also facing the dilemma of weak political leadership, inadequate capacity of Party members and cadres and dilute Party-masses Relations. In order to solve these difficulties, we need to strengthen the political function of grass-roots party organizations, strengthen the construction of Party members’ talent team, and increase the mass line education practice activities to enhance the leadership of grass-roots party organizations.
Distributed Topology Identification Information Model of Distribution Network Based on IEC61850
Authors: Zheng Ganyun , Xu Qifeng , Wang Dujing , Xie Nan 
Published: August 2019

Abstract
This paper proposes a distributed topology information model based on IEC61850 to support the distributed topology processing function of the distribution network automation system. The information model expands the new logical nodes and common data classes for storing local topology information of local subgraphs and communication information of adjacent intelligent electronic devices. By using the distributed adaptation of graph connectivity algorithm and the extended IEC61850 information model, the dynamic topology identification function of the distribution network structure is realized. The extended information model and topology recognition algorithm are verified by the cyber-physical simulation system.
Parametric Sensitivity Analysis of Automobile Radiator Performance
Authors: Bargal Mohamed H.S. , A. Abdelkareem Mohamed A. , Wang Yiping 
Published: August 2019

Abstract
The automotive radiator is an important part for automotive engines regarding its direct influence on the thermal performance of the engine. This paper presents a theoretical parametrical sensitivity analysis of an automotive radiator based on the effectiveness-NTU method. In this manner, the paper firstly focuses on the influence of operating conditions of both the water and air including inlet temperatures and Reynolds numbers on the radiator effectiveness, heat transfer rate, and the pressure drop. Furthermore, the sensitivity of the radiator responses versus these operating conditions is provided. Given the obtained results, it is concludingly reported that the radiator effectiveness correlates significantly to the water Reynolds number and the water inlet temperature rather than its correlation to the air Reynolds number and air inlet temperature. While the heat transfer rate correlates strongly to the inlet temperatures of the water and air, respectively, while the heat transfer rate weakly responded to the Reynolds numbers of the water and air. On the third hand, the water pressure drop presented higher sensitivity change at lower water temperatures.
Study on Dimension of Landing Gear Bogie for Civil Aircraft
Authors: Li Zhongjian , Mu Tengfei 
Published: August 2019

Abstract
In order to study the method on rapid design of bogie dimension for aircraft landing gear, the paper firstly clarifies the dimension definitions of landing gear bogie, then proposes four kinds of constraints which have influence on determination of landing gear bogie dimension: expanded-tire dimension limit, clearance requirement, flotation characteristics requirement and bogie accessories dimension requirement. These four kinds of constraints form an area where can be selected to define the bogie dimension during aircraft initial design phase.
Compilation technique of outside fillet macro program
Authors: Wang Shuai , Zhao Xueqing 
Published: August 2019

Abstract
With the popularization of software automatic programming, the application of macro program has become the greatest advantage of manual programming. In fact, macro programs have irreplaceable advantages in the processing of specific geometric shapes. Combining with the most common Siemens subsystem in the world, this paper expounds the programming skills of the outside fillet macro program. Three layers of nesting, i.e. main program nesting subroutine and re-nesting subroutine, are used to compile the outside fillet macro program. It has been widely applied in practical machining.
Impact Path on the Development of Railway Freight Transportation Services by Informatization Based on Sector Perspective
Authors: Jin Zongzhen , Cao Lili , Cheng Yonghong 
Published: August 2019

Abstract
The effect of informatization and standardization on civil aviation, waterway transport and highway transport is analyzed respectively, which finds the informatization is embedded the freight standard. Information has played the important role in the improvement of the freight efficiency and service quality in three transport sectors. Learning from the above experience, some suggestions on informatization-driven quality improvement in railway freight transportation services are given below to promote the transformation of railways into a modern logistics system, to develop the mechanisms and systems that meet the requirements of market economy for railway transportation management, and to establish modern logistics enterprises.
Design, Simulation and Fabrication of a Time-Delay Device Based on Micro-Channel
Authors: Zhao Qiaoran , Sui Li , Song Ping 
Published: August 2019

Abstract
With the development of micro-machining technology, the application of microchannel is becoming more and more popular. In this paper, we design a set of time-delay device based on micro-channel and micro-fluidics technology. This paper describes the time-delay device’s working principle and analyses the micro-channel’s flow characteristics by simulation method based on Coventerware. From studies on the micro-channel’s cross section, geometry and dimension parameters, the micro-channel’s optimal form and dimension can be obtained. Finally, this paper chooses ultra-machining process to fabricate the time-delay device.
Intelligent Analysis Method of Assembly Process Based on Semantic Elements
Authors: Du Zenghui , Liu Jianhua , He Yongxi 
Published: August 2019

Abstract
The assembly process file is a direct expression of the product assembly design intent. In order to improve the quality and efficiency of the assembly, the 3D model of the product and resources needs to be introduced into the virtual assembly environment. However, the assembly process is verified and optimized by assembly simulation. In order to realize the intelligent analysis of assembly process files and the automation of assembly simulation, an intelligent analysis method of assembly process based on semantic elements is proposed. This article takes the assembly process documentation of complex products as the research object. An improved TF-IDF algorithm is proposed to automatically extract key semantic elements in the assembly process file. We quickly resolve previous assembly process data by building assembly key semantic corpora. An assembly semantic dependency tree algorithm based on maximum entropy is proposed to automatically reason the logical relationship of each assembly phrase in the assembly process statement. According to the above algorithm, the assembly semantic intelligent analysis system is developed. The assembly process of a certain type of ground weapon system is taken as an example to verify the system. And the intelligent analysis of the product process file is realized which lays a foundation for realizing the semantic driving of product assembly simulation.
Design of a reciprocating freight ropeway in mountain orchard
Authors: Guiju Fan , Fu Qin , Tiantao Feng , Hao Zhang , Zhao Li 
Published: August 2019

Abstract
Aiming at the problem of high labor intensity in field transportation of fruit in mountain orchards, a single-span reciprocating ropeway transportation system was put forward according to the topographic characteristics of mountain areas and the income of fruit farmers. The ropeway transport system consists of an electric winch, two pillars on the left and right, a circulating traction wirerope, a track rope, wind cables, a sports car, and tensioning mechanisms. Through analysis and calculation, steel wire ropes with diameters of 12mm and 6mm are used as track rope and traction rope; electric winch machines with power of 1.5kW and reduction ratio of 15 are selected, and the friction reel diameter is 200mm. Finally a single-wheeled sports car is designed to ensure the normal transportation of the ropeway.
Research and Application of Laser Ranging Method in Form and Position Tolerance of Precision Machining Products
Authors: Ouyang Hongmei , Zhou Mingyao , Gao Lei , Wu Yu , Yang Li , Li Jieji 
Published: August 2019

Abstract
Precision measurement of shape and position tolerance plays an important role and significance in manufacturing industry. It is an important link to measure and guarantee the quality of manufacturi ng. Especially for large-scale precision parts, the repeated use of measuring tools easily leads to measurement errors. Aiming at the problems of low detection efficiency, complex process and high cost of high precision three-coordinate measuring instrument for large-size parts, the characteristics of contact measurement and non-contact measurement for large-size parts are studied based on the characteristics of large-size parts. A measurement method combining laser ranging with reflective target is proposed, and a rotating shaft for fixing laser launcher is designed. A complete spherical coordinate measuring system is constructed, which is applied to the measurement of straightness, flatness, parallelism, verticality and height difference of large-scale precision machined parts. The corresponding measurement results are obtained in a constant greenhouse. On this basis, under the same temperature conditions, the same shape and position tolerance dimensions of the same part are measured by a three-coordinate measuring instrument. Comparing the results of measurement, it can be seen that the measurement results obtained by the two methods are the same in the range of 0.001 mm, and the measurement efficiency and cost of the laser ranging method have obvious advantages. This paper also gives the method of measuring the shape and position tolerance of large-scale precision parts.
Design and application of robot welding station for BTE
Authors: Yang Qinglong , Qi Baoyun , Mao Qinjian , Wang Ten 
Published: August 2019

Abstract
The battery tray enclosure (BTE) is an important part of new energy vehicles, and has high requirements on quality, strength and heat dissipation. Considering the function of the BTE, the characteristics of the welding process and the specialty of the tooling system, a BTE robot welding workstation was developed by integrating the fusion welding technology, weld seam tracking technology, sensor technology and machine electrical integration engineering technology. The one-time fully automatic welding of the frame tray improves the working environment, reduces labor intensity and the welding skill requirements, and avoids poor quality such as less welding, leakage welding, and poor consistency due to manual welding.
Design and experimental performances of a piezoelectric stick-slip actuator for rotary motion
Authors: Ding Zhaochen , Dong Jingshi , Yin Haojie , Wang Zhe , Zhou Xiaoqin , Xu Zhi 
Published: August 2019

Abstract
In order to reduce the regression phenomenon of the piezoelectric stick-slip actuator, and improve the output performance, a piezoelectric stick-slip actuator with regular octagonal flexible hinge mechanism is proposed in this paper. The pseudo-rigid body method is used to analyze the regular octagonal flexible hinge mechanism and the flexible driving foot respectively.A prototype is fabricated to test the working performance and the results demonstrate that the minimum step is 0.01μm, the maximum speed is 145251μrad/s, and the maximum load carrying capacity is 500g. The experimental results show that the parasitic motion suppresses the regression of the actuator and improves the output stability.
Research on counter-roller spinning force based on finite element simulation and experiment
Authors: Guo Yaming , Li Mingzhe , Huang Tao , Wang Dali , Zheng Hongwei , Luo Wei , Li Yinan , Gao Wulin , Zhao Xing 
Published: August 2019

Abstract
Counter-roller spinning is an effective method for forming large metal cylindrical parts. In this paper, the radial, axial and tangential counter-roller spinning forces were analyzed. The simulation analysis model was established and the counter-roller spinning was simulated based on the commercial FEA software, SIMUFACT-FORMING. The influence of different thinning ratio, feed rate and forming angle of roller on spinning force was analyzed. It can be seen that the deviation between the simulation average radial spinning force and the experiment average radial spinning force was less than 12%, and that of the axial spinning force is less than 10.5%, which can effectively guide the spinning process test.
Bonding Heating Control Based on PID
Authors: Yu Ye 
Published: August 2019

Abstract
In the process of chip production, the bonding machine, as the post-process of chip manufacturing, is a key process to determine the chip productivity and quality. The process of wafer bonding usually involves heating silicon wafer, glass backing and other materials to a certain temperature in a vacuum environment, applying a certain pressure, and bonding for a certain period of time. In the bonding process, the time to heat the material to the specified temperature accounts for about 20% of the whole bonding process. Therefore, shortening the heating time has a great effect on improving the yield. In addition, in the process of heating and pressure, improving the heating stability, reducing the temperature oscillation, can reduce the material deformation and improve the bonding accuracy. In this paper, the intelligent temperature control system based on PID is adopted to control and adjust the bonding heating in real time, so as to shorten the heating time, reduce heating control oscillation, improve the heating effect, and improve the yield and yield.
Status evaluation of smart substation measurement and control device
Authors: Min Zhang , Jian Shen , Li Chen , Bin Zhou , Liang Zhou Shao , Zhe Hou 
Published: August 2019

Abstract
In power system, measurement and control device plays an important role in maintaining an ideal level of reliability. Therefore, the reliability of the measurement and control device should be evaluated to fully understand the cause of its failure. A new evaluation model is proposed, which relates the fault of measurement and control system with the four main reasons of device hardware fault, software fault, auxiliary equipment fault and human fault. In addition, the model can also comprehensively consider other aspects of the measurement and control system, such as human error in testing and software upgrade, effectiveness of daily operation monitoring, degree of dependence on self-inspection, local backup and misoperation. These studies have a lot of significance to the reliability of the control system, and also can effectively improve the stability of the system.
An Observer-Backstepping Robust Controller Design Method
Authors: Li Zhen , Chen Xin 
Published: August 2019

Abstract
Unmodeled dynamics and external disturbances are the main factors affecting system performance. In this paper, a robust design method based on backstepping control and observer is proposed to overcome the problem of the system unmodeled parts and external disturbances. To improve the performance, the controller uses adaptive function to eliminate the effect of the unmodeled dynamics. For the external disturbances, this paper using observer to accurately estimated and effectively compensated. The simulation results show that the controller designed in this paper has good performance and can accurately response the input commands in the case of the unmodeled part of the system and the external disturbance.
Research and Design of Theme Image Crawler Based on Difference Hash Algorithm
Authors: Wang De-zhi , Liang Jun-yan 
Published: August 2019

Abstract
For the problem of high repetition rate of image resources collected by general theme crawler, a theme image crawler system is designed to reduce image similarity. The main contents of the design include the main function modules of the crawler, the workflow of the system and the implementation method of the key modules. The difference hash algorithm is used to solve the problem of image similarity effectively. Combined with Web text cosine correlation algorithm and link PageRank algorithm, the paper comprehensively evaluates the relevance between Web resources and topics. The experimental results show that the subject image crawler can effectively reduce the similarity of the collected images and improve the efficiency of crawler image resources acquisition.
Prediction of Building Power Consumption Based on GAWNN
Authors: Yaqing Tian 
Published: August 2019

Abstract
With the continuous development of urban modernization, the power consumption of building is increasing rapidly. In the context of the basic national policy of sustainable development, energy conservation and emission reduction of building energy consumption is imperative. In this paper, the relevant influencing factors of building electricity consumption are considered comprehensively. The wavelet neural network combined with genetic algorithm is (GA-WNN) used to predict the power consumption of buildings. The experimental results show that the prediction effect and relative error of GA-WNN algorithm are better than other prediction methods. The unique advantages of the algorithm in the field of building power consumption prediction can provide a scientific basis for energy saving and consumption reduction. It can facilitate managers to formulate efficient energy management solutions to optimize resource allocation.
Design of Belt Conveyor Speed Control System of “Internet+”
Authors: Li Zhiqiang , Zeng Fei , Yan Cheng , Wang Junjie , Tang Ling 
Published: August 2019

Abstract
In this paper, a belt conveyor speed control system based on “Internet +” is designed by using the embedded web and single-chip microcomputer. By monitoring the running state of the belt conveyor, adjusting the speed between the two stages of the belt conveyor, real-time monitoring of the speed between the two stages of the belt conveyor, and two levels of the difference between the speeds is used as the input parameter of the speed control PID algorithm to achieve a smooth transition between the two stages of the belt conveyor. The system has the advantages of strong expandability, strong portability, high efficiency and environmental protection.
Optimal design of tong dies parameters for drill pipe clamping manipulator
Authors: Sha Yongbai , Wang Guanghui , Zhao Xiaoying , Ouyang Tiancheng 
Published: August 2019

Abstract
The tong dies are one of the important components of the drill pipe clamping manipulator and they contact with the drill pipe directly, which are used to increase the friction force, improve the clamping effect and ensure the reliability of the drill pipe clamping. The parameters of the tong dies determine the performance of the clamp teeth, and in this paper, the objective function for parameter optimization of the tong dies is established, and the optimal solution is carried out, and the optimal parameters of the tong dies are determined.