bluuebunny/crossref_metadata_2025_split huggingface dataset:
Blade Structure Design Based on Multi-objective Optimization of Automotive Fan
Authors: Zhong Yinhui , Li Yinong , Li Peiran , Chen Jingchang , Xia Tiequan , Kuang Xiaohong 
Published: June 2021

Abstract
In order to improve the fan noise, the multi-objective optimization algorithm was implemented to optimize the fan blade structure. Firstly, the theoretical model with the noise, flow rate and power of fan as the objectives was established and verified; then, the global sensitivity analysis method based on sobol’ method was used to obtain the contributions of each parameter to the performance objectives of the fan by taking the fan blade angle and chord length as the analysis parameters; finally, the sensitive parameters are selected to obtain the best noise-oriented comprehensive performance of the fan by the genetic algorithm. The result shows that the noise is reduced by 3.1dB, the flow rate is increased by 7.7% and the power is reduced by 7.9% after optimizing fan blade structure, and the overall performance of the fan is significantly improved.
A nets fixing device embedded in a circular floating net cage
Authors: Liu Jinlong , Zhu Lei , Yao Jun , Xiao Yun 
Published: June 2021

Abstract
A nets fixing device embedded in a circular floating net cage is presented in this paper, it consists of arc metal rods, wire ropes and sleeves. The arc metal rod is a circular arc metal rod with a connecting plate at both ends and a shroud ring at the inner side of the middle. Multiple arc metal rods can be fixedly connected to form a ring shape; During assembly, each arc metal rod is assembled into a circular ring. A wire rope is bound on each ring of a circular arc metal rod, and then the wire rope is pulled to sink the circular arc metal rod into the water inside the cage. Then, in the depth range of the nets, the interval and alternating sleeves of the wire ropes are inserted into the casing pipe and the circular arc metal bars, and the wire ropes are straightened and bound to the cage frame, thus forming the nets fixing device. The proposed device has simple structure, light weight, less material, high strength, and low overall price, which can effectively reduce the volume loss rate of nets, and is convenient for installation and removal.
Design and calibration of intake model for electric supercharged gasoline engine
Authors: Li Yuandong , Du Yongbo , Yang Chuan , Chen Bin , Li Lin , Zhang Li 
Published: June 2021

Abstract
The electric supercharger can significantly increase the transient intake air charge of the engine, thus increasing the power output of the engine under heavy load conditions. However, the traditional in-cylinder intake air charge calculation model has heavy calibration workload and low portability, and is not suitable for the intake air charge calculation of the electric supercharged gasoline engine. In order to reduce the difficulty of in-cylinder intake air calibration and improve the accuracy of intake air estimation, based on an electric supercharged gasoline engine, this paper simplifies the actual intake process into valve overlap period and free intake period, and proposes an in-cylinder intake air charge estimation model with intake pressure sensor as the main load sensor based on the mean value engine model. Three unknown coefficients, i.e., residual exhaust gas correction coefficient ɑ1, heat transfer coefficient ɑ2 between manifold and fresh gas, and effective flow area ɑ3 in valve overlap period, are calibrated by using the simulation data of the numerical model of electric supercharged gasoline engine. Compared with the numerical simulation results, the air intake model established in this paper can accurately estimate the actual in-cylinder air intake of electric supercharged gasoline engine under the external characteristic condition, and the calculation error is within 5%, which can provide theoretical reference for the in-cylinder air intake estimation of electric supercharged gasoline engine
Risk Analysis and Accident Causes of Mobile Phone Charger
Authors: He Fengping 
Published: June 2021

Abstract
All kinds of mobile phone chargers in the actual use process, due to poor quality products or improper use will cause safety accidents, causing great harm, so this paper has great practical significance to study the use risk and accident causes of mobile phone chargers. First of all, through the failure of insulating materials between conductive parts of mobile phone charger, the use of substandard artificial plug-ins in the production of components, the use of waste circuit boards or circuit board aging, and the unqualified quality of high-frequency transformer, the use risk and reasons of inferior products are analyzed. Secondly, the risks and causes of improper use of mobile phone chargers are analyzed by analyzing the factors such as alternate mixing of different specifications of mobile phone chargers, using mobile phone while charging, and long-term plugging in the socket. Finally, three typical cases of accidents caused by the breakdown of the insulation between the conductive parts of the mobile phone charger, the excessive current at the output end, and the defects of the material are analyzed, which provides better technical support for better eliminating the hidden dangers of the mobile phone charger.
Research on Process Optimization and Unified System Content in Big Data Network Information Sharing Environment
Authors: Gu Quangen , Li Lingyao 
Published: June 2021

Abstract
In the context of big data and data sharing, companies are strengthening internal control to enable companies to develop healthily and sustainably. Business process planning is the key to the success or failure of internal control. This article takes S Group as an example to discuss the optimization of its expense reimbursement business planning, which has certain reference value for enterprise expense reimbursement business control.
Genetic Algorithm Based Method for Signal Channel Allocation of Mobile Base Station Optimization
Authors: Yan Yida 
Published: June 2021

Abstract
Signal frequency band allocation is a crucial task in mobile communication. In realistic, the frequency resources that can be used to realize communication are relatively scarce. There are signal frequency interference problems between adjacent base stations. Existing frequency band resource allocation method try to find the best allocation program by visiting every node to search local optimal allocation program for each station. However, existing method is computationally complex. In this paper, we propose a global optimization model and solving the problem based on genetic algorithm. Finally, we test on an example to demonstrate the effectiveness the proposed method.
Research on Dynamic Reconfigurable Convolutional Neural Network Accelerator
Authors: Deng Bao , Lv Hao 
Published: June 2021

Abstract
The hardware implementation of convolutional neural network has the problem of resource limitation, which can be solved by the design of convolutional neural network accelerator based on FPGA dynamic reconstruction. The whole parallel strategy and architecture of CNN accelerator are designed, and the functional modules of CNN are designed based on pipeline. The dynamic reconstruction technology is used to redesign the convolutional neural network accelerator, and the dynamic reconstruction region and division are established; BPI flash is selected to store the configuration file, and the configuration file is read internally to dynamically configure the dynamic reconstruction area. Finally, for lenet. 5 handwriting recognition, compared with the corresponding static design, the use of slice LUTS, slice registers and DSP resources of the accelerator based on dynamic reconstruction design is reduced by 46%, 25% and 68% respectively. Compared with the implementation based on software platform. The system execution time is greatly reduced. However, due to the bandwidth limitation of the internal configuration port, the reconfiguration configuration time prolongs the execution time of the whole convolutional network.
A simple 24-second timer design for basketball games
Authors: Yu Jing 
Published: June 2021

Abstract
In recent years, basketball has been very popular among students, based on the knowledge learned in the course, this paper designed a “basketball game 24 seconds timer design”, which can be completed: display 24 seconds countdown; system set external operation switch, control the timer direct zero, start and pause/continuous function. When the counter is decreasing in 24 seconds, the timing interval is 1 second; when the timer decreases to zero, the digital display shows zero and an audible and visual alarm signal is issued. The whole circuit is designed with the help of the theoretical knowledge related to digital circuits and the simulation of the circuit is completed using Proteus software to obtain the expected results.
The Algorithm of Comprehensive Support Degree for Sensor Array Based on Spectrum Consistency
Authors: Liu Yalei , Gu Xiaohui 
Published: June 2021

Abstract
Aiming at the problem of data fusion deviation caused by the uncertainty of observation information in the multi-sensor data fusion algorithm, this paper proposes an array comprehensive support algorithm based on the spectrum consistency of the observation information. Starting from the probability distribution function of the array observation model, the algorithm introduces a multi-sensor consistent data fusion method. Aiming at the empirical selection of data fusion thresholds, the algorithm discusses the consistency processing method of the symmetric distance function, and comprehensively considers the multi-sensor delay estimation, A comprehensive support degree algorithm for spectrum consistency is proposed. The hardware-in-the-loop simulation test of the quaternary acoustic array verifies that the proposed algorithm not only reduces the observation noise caused by the uncertainty data fusion deviation, but also realizes the effectiveness of the estimation of the multi-sensor observation signal under the condition of unknown prior signal.
Research and Design of Wearable Intelligent Umbrella to Help People in Rainy Days
Authors: Lu Yuliang 
Published: June 2021

Abstract
Because the people with upper limb disability will encounter travel problems in rainy days, researchers designed and made wearable intelligent umbrellas, so as to improve the rain-shield efficiency of the disabled when traveling in rainy days. People with upper limb disabilities will suffer from poor balance and low rain-shield efficiency when holding umbrellas with one hand. This umbrella can be used as a backpack for people with upper limb disabilities. When traveling in rainy days, the umbrella will automatically adjust the orientation of the umbrella surface according to the wind speed sensor on the other side of the backpack to improve the rain-shield efficiency. The design of umbrella is based on physical experiments, and the conclusion of rain-shield efficiency is also drawn from experiments, which ensures the strong scientific nature of the research. At present, the conclusion of the experiment verifies that umbrellas can be used in daily life and can run normally under turning, walking, turning and other actions. This study can improve the travel convenience of disabled people and improve their social identity.
Floating Garbage Collector Based on OpenMV
Authors: Yao Chengkai 
Published: June 2021

Abstract
Due to the high cost of human labor for maintenance, garbages in rivers often do not receive immediate cleaning, resulting in severe water pollution. Those floating garbages simultaneously strip the aesthetic of rivers and threaten the local marine ecosystem. Thence, we developed an unmanned vessel based on Arduino’s platform, capable of auto-collecting garbage. The vessel includes two modes: the human operational mode allows individuals to manipulate the vessel and to collect garbages through Bluetooth connection; the auto-collecting mode is based on OpenMV’s video processing function, enabling vessels to detect garbages nearby and transport the garbages into the vessel’s interior through a rotating caterpillar track. At the end of this project, the vessel remains large rooms for improvements, such as increasing the efficiency and effectiveness of garbage collection and garbage detection. The vessel is suitable in small size rivers or ponds were artificial cleaning faces obstacles.
Research on CFRP inner wall roughness during vibration drilling of CFRP/Ti based on acoustic emission
Authors: Nie Peng , Ma Yao , Liu Siyao 
Published: June 2021

Abstract
Aiming at the quality problem of the CFRP inner wall in the CFRP/Ti laminated material assisted vibration drilling technology, the acoustic emission (AE) signals of different processing parameters during drilling are collected. Analyze the relationship between the characteristics of the acoustic emission signals and the roughness of the CFRP inner wall under different processing parameters and different number of holes. The test results and analysis show that other parameters are kept unchanged during the test process, only one parameter is changed. When the amplitude and spindle speed increase, the AERMS value increases while the CFRP inner wall roughness decreases. When the feed rate increases, the AERMS value and CFRP inner wall roughness increase simultaneously. The energy ratio of the wavelet packet of the AE signals is also closely related to the roughness of the CFRP inner wall. Therefore, in the actual machining process, the CFRP inner wall roughness can be monitored by monitoring the AE signals to improve the processing efficiency.
Processing method of acceleration signal with zero drift
Authors: Shi Yonglei , Fang Liqing , Li Rongxiang , Guo Deqing , Zhang Sa , Tang Qiongjie 
Published: June 2021

Abstract
An economical and effective method to measure displacement is to integrate the acceleration signal. Because of the zero drift in the acceleration sensor, there will be a trend term in the process of acceleration secondary integration, which will cause some errors in displacement measurement. In this paper, several methods of acceleration signal processing with zero drift are given, and the advantages and disadvantages of these methods as well as the applicable occasions are analysed, which have important reference value for selecting reasonable methods in dealing with engineering problems.
Research on the Kinematic Compatibility of Position Solution of a Four-DOFs Mechanical Structure Mechanism
Authors: Li Jianfeng , Cao Qiang , Dong Mingjie 
Published: June 2021

Abstract
Upper extremity rehabilitation exoskeletons are the key devices for stroke patients with movement function disorders. Based on the configuration synthesis and optimum principles of 4-DOFs upper limb exoskeleton mechanisms, an exoskeleton mechanism compatible with upper limb were presented. When the exoskeleton was worn to the upper extremity, a kinematic chain with two closed loops was formed. Moreover, the kinematic equations of the chain were established and a position solution method was addressed. Based on the presented position solution, the kinematic characteristics during eating movement were investigate. The conclusion suggested that the exoskeleton was applied to the upper extremity rehabilitation and can be applied as main structural design parameters for the presented exoskeleton.
The Construction and Research of Control System and Accounting Informatization by Visualization Mode
Authors: Lv Yanrong , Li Jia , Chen Lulu , Li Xin 
Published: June 2021

Abstract
This article raises the issue of enterprise cost and project management control, analyzes the cost and expense project management and control model, and proposes the definition of daily business documents and cost types involved in the cost and expense project management and control model. In the cost and expense project management and control model, the following concepts are proposed: target cost, budgeted cost, actual cost, contract split cost, non-contract split cost, pending split cost, dynamic cost, design and cost expense project management Control related daily business processing documents, that is, contract documents, non-contract documents, cost documents to be incurred, and payment documents, and decompose to generate corresponding contract split costs, non-contract split costs, pending split costs, and corresponding The payment plan can be compared with the real-time monitoring of the target cost and budget cost through the dynamic cost (the sum of contract splitting cost, non-contract splitting cost, and pending splitting cost) and the real-time monitoring of the payment time, payment amount and payment plan Realize the management and control of cost items. At the same time, the paper puts forward the basic idea of the design of the cost and expense project management and control system, analyzes the flow of the cost and expense project management and control system, and demonstrates the operating effect of the cost and expense project management and control system.
Research on the Influence of Non-Conductor on the Weight Function of Electromagnetic Flowmeter
Authors: Li Xuejing , Sun Lijun 
Published: June 2021

Abstract
The demand for multiphase flow measurement is widespread in petrochemical and other fields. Due to its small size, easy maintenance, and no moving parts, electromagnetic flowmeters are widely used in single fluid measurement. With the increasing application of traditional electromagnetic flowmeters in petrochemical and other fields, the problems of traditional electromagnetic flowmeters in multiphase flow measurement applications have been discovered. How to optimize the structure of the electromagnetic flowmeter and how to improve the measurement accuracy has become a new research focus. On the basis of a large number of literature studies, this research is based on the finite element method, and systematically studies the influence of multiphase flow on the weight function of electromagnetic flowmeters. Firstly, modeling the existence of non-conductive objects in the electromagnetic flowmeter. Secondly, analyze the weight function characteristics of the non-conductive objects on the electromagnetic flowmeter from two angles of different radii and different positions. The conclusions of this study can provide a certain reference basis for the electromagnetic flowmeter in the measurement of multiphase flow.
Study on Environmental Performance Evaluation Model of Coal Mine Using Balanced Scorecard and Ubiquitous Computing
Authors: Gao Xizhen , He Xiao 
Published: June 2021

Abstract
Based on the analysis of the current situation of environmental performance evaluation of coal enterprises in China, this paper uses the Balanced Scorecard as the basic framework to comprehensively evaluate environmental performance from the dimensions of environmental finance, internal environmental management, stakeholders and learning and growth. Set up a number of indicators in each dimension, use AHP to determine the weights of indicators at all levels, and test the rationality of index weights through consistency, and establish a comprehensive environmental performance evaluation system.
A Real-time Vehicle Detection Method for Unmanned Driving
Authors: Wei Lai , Zhou Bo , Liu Bin 
Published: June 2021

Abstract
Real-time object detection is the core technology in the perception of unmanned driving. In this paper, a real-time object detection method based on YOLOv4 for unmanned driving is proposed. In the practice of unmanned driving, the illumination and large-scale change effect the visual perception of unmanned vehicles. To overcome the influence of different illumination and scale change in real scenes, we enhance the scale, illumination and other aspects of the images in the training set and the test set, and fuse with the original data. The training set and the test set in this paper use the actual road driving images taken by road traffic monitor. By these ways, more competitive vehicle automatic detection results than the original yolov4 model has been achieved.
Multi-index Evaluation of Health Care System and Its Effect Prediction
Authors: Fan Yue , Zhang Yunhan , Luo Yun 
Published: June 2021

Abstract
Health care systems are crucial to people’s lives, so we established a quantitative model of multi-index health care assessment system to evaluate health care systems of different countries objectively. Firstly, we adopted the entropy weight method to calculate the weight of each indicator and built a linear function to derive the scoring results of the system in each country. Secondly, we used the incomplete induction method for the secondary screening of indicators, and the weight of selected seven indicators are: 0.16 0.11 0.13 0.14 0.19 0.15 0.12. Thirdly, we compared different countries’ health care systems. Compared to the America’s health care system, Japan had a better one, while China had a poorer one, and the scores of them are: 71.23 77.87 38.96. Finally, we proposed two suggestions to U.S. and predicted its improvement effects by BP neural network. Given the ease of implementation, cost and other issues, the latter is considered more appropriate.
Simulation analysis of reflective performance of marking glass beads
Authors: Leng Zhengwei , Wang Luwan , He Huayang , Wang Rui 
Published: June 2021

Abstract
Road traffic markings are made of glass beads embedded in paint. To analyze the effects of glass-bead radius, embedment depth, correlated color temperature of light sources, and incident angle on the reflective performance of glass beads, a numerical model is established using the geometric optics method, effective light conditions are analyzed, calculation methods for optical power devised, and non-standard planes of incident light calculated. Calculations were also carried out. Results show that the retroreflective properties of glass beads are positively correlated with the correlated color temperature of the light source and radius of the beads. The glass-bead radii, embedment depths, and incident angles have little effect on their reflective performance. Moreover, the correlated color temperature of the light source is an important factor affecting the accuracy of measuring glass-bead reflective performance. When using retro reflectometers, standard retro reflectance-measuring devices for retro reflectance measurement, and other equipment to evaluate the reflective performance of road traffic markings, the correlated color temperature of the light source of the equipment should be as close as possible to 2856 K.
Construction of Shelf-Life Prediction Model for Golden Delicious Apple Based on Electronic Nose
Authors: Xi Pushun , Zhu Danshi , Shen Yusi , Ren Xiaojun , Zhang Yueyi 
Published: June 2021

Abstract
The Golden Delicious apple shelf-life prediction model based on electronic nose was built by partial least squares regressions (PLSR). Sensory quality, such as, weight loss, texture, color changes and electronic nose were studied. The correlation between the electronic nose sensors and the sensory quality of Golden Delicious apples were analyzed to select the appropriate sensors for the construction of the shelf-life model. The results of the shelf-life prediction model on Golden Delicious apples building by PLSR showed that R2 of training set was 0.86, RMSEC was 3.94. The R2 of prediction set reached to 0.98, and the model was relatively accurate.