bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Study of Heat Conduction in Functionally Graded Plate Based on Hybrid Numerical Method Loading by Linear Heat Source
Authors: Tian J H , Jing G Q , Ding F , Hu G C 
Published: March 2021

Abstract
In this paper, a physical model of functionally graded materials (FGM) with a linear change of volume fraction of ceramic and metal in its thickness direction is established. The thermal conductivity of the FGM under a linear heat source is studied by a hybrid numerical method. Based on the weighted residual method, the heat conduction equation under a third boundary condition is studied using a hybrid numerical method which takes into account both the accuracy of the analytical method and the efficiency of the finite element method. A linear heat source is applied to the FGM, the temperature of the heat source changes linearly with time, and the temperature distribution in the space-time domain is obtained by finite element discretization in one direction and Fourier transform in the other. The results show that the closer to the heat source, the greater influence of the heat source it is. The influence of the heat source is local, which is similar to the influence of the force field on structure described by Saint Venant theory. In the heat transfer process, the heat transfer efficiency of each surface is different, that is closely related to the material properties. Using this proposed physical model, it is demonstrated that FGM can avoid the sudden change of temperature and relieve the thermal stress.
Research on Trajectory Tracking Control Method of Omnidirectional Moving Platform Based on Backstepping
Authors: Wen Boyu , Gao Zhenqing , Gao Baolei , Qin Zhimin , Du Yanping , Li Hongfeng 
Published: March 2021

Abstract
According to the relevant theoretical methods of omnidirectional mobile mechanism, the kinematic model of omnidirectional mobile platform under theoretical conditions is established, and the dynamic model of omnidirectional mobile mechanism in actual environment is analyzed according to the specific situation of platform body structure and actual influencing factors. Based on the kinematic model, a backstepping based trajectory tracking control method for omnidirectional mobile platform is designed, and the trajectory tracking error equation is solved. In order to further improve the stability of the system, a fuzzy control system based on backstepping method is designed based on the dynamic model, and the control torque of the platform is selected. Finally, the effectiveness of this method is verified by numerical simulation.
Varying control intensity of synchronized chaotic system with time delay
Authors: Onasanya Babatunde O. , Wen Shiping , Feng Yuming , Zhang Wei , Tang Ning , Ademola Adeleke T. 
Published: March 2021

Abstract
Hyperchaotic system is a very useful tool in secure and encrypted communications. But situations arise when engineers and scientists seek to synchronize two hyperchaotic systems. This gives another (error) system. The goal is to minimize the error as much as can be in order to make one system look like the other by synchronization. This is a particularly challenging situation. In this paper, two hyperchaotic systems are synchronized by impulsive control. Also, the condition for uniform asymptotic stability of the synchronized error system was given. Finally, the simulation results to justify the reliability of this method is also presented.
Co-attention Spatial Reasoning for Visual Question Answering
Authors: Qin Ye , Zhou Zhiping , Biao Chen , Wenjie Li 
Published: March 2021

AbstractVisual question answering (VQA) requires both inferring and providing correct answers based on the semantics of the question and the content of the image. We propose a co-attention spatial reasoning model, it models the co-attention, and spatial reasoning attention for the VQA task. The model maps the question text information to image region to reason the fusion features, which contain fine-grained semantic information of two models. Meanwhile, it can obtain the spatial relationship between question words and image regions. The model was trained and verified on the VQA-v2 dataset, the best single model achieves an accuracy rate of 69.55% on the test-dev set.
Model of Normal University Students’ Education Quality Based on Artificial Neural Networks
Authors: Wang Shaofeng , He Yue , Lin Haitao 
Published: March 2021

Abstract
As a main form of checking out learning and teaching effects, exam has traditionally been used in schools. Accurate and objective assessment of students’ learning effects through examination performance is an important part of evaluation of students’ education. This paper proposes a comprehensive evaluation model of evaluating examination performance based on quality of examination paper, explores the application of artificial neural network technology in students’ comprehensive education evaluation, focusing on BP neural network, some works can also be introduced by Python. The process is to compose input vector of BP neural network using the four evaluating indicators of quality of examination paper, namely reliability, validity, difficulty and discrimination, and raw score, namely the students’ score of examination paper. Take valuation namely the quantitative value of learning effect as the output vector of BP neural network. Design a reasonable network structure and training sample, put the training sample in the network for processing till until systematic error meets the specified requirements. By so, the obtained network model is the required comprehensive evaluation model of examination performance. At last, the paper analyzes the simulation of the evaluating model’s feasibility using MATLAB software, obtains satisfying results, and proves the feasibility of the proposed network model.
A Calibration Approach to Solve Inconsistency Problem in Palmprint Acquisition System
Authors: Zhang Kunai , Guo Zhenhua 
Published: March 2021

Abstract
Inconsistency among different acquisition devices severely affects the performance of palmprint recognition systems. When the same palm is enrolled by one capture device and verified by another device, the inconsistency between the two devices may lead to recognition failure. The installation of camera and the setting of lighting are two main reasons for inconsistency problem in palmprint recognition systems. In this article, we proposed a calibration approach for the inconsistency problem regarding palmprint acquisition devices. Our calibration approach includes image quality assessment, rectification and normalization. Experimental results demonstrate that the proposed approach is effective, decreasing the equal error rate (EER) of palmprint recognition from 0.653% to 0.627%.
The Control of Over-saturation at the Critical Intersection Based on the Improved SEFP Method
Authors: Shen Hui , Liu Zhigui 
Published: March 2021

Abstract
We have proposed the SEFP (Same Entrance Full-Pass) method in our previous research work in order to avoid the congestion at the key spot in the regional road network. The SEFP method, which can make all vehicles going to the critical intersection pass the stop-line with no stop during each release phase, reducing the vehicle delays and stops greatly. While the green time is underused in this method and the vehicle throughput at the critical intersection can be further increased. On this basis, we propose the improved SEFP method, which can formulate signal offsets control schemes at the upstream intersections by means of traffic wave theory, guaranteeing all the vehicles leave the critical intersection at saturated flow speed. In the meantime, the closure control is adopted at upstream intersections timely in light of the queuing length on the critical intersection lanes, avoiding the spill-outs effectively. This new method can improve the traffic throughput of the critical intersection while decrease the vehicle delays and stops, preventing the critical intersection from traffic over-saturation effectively. The simulation results of an actual critical intersection in Mianyang city demonstrate the validity and feasibility of the improved SEFP method.
Method for Robot Capturing Object Thrown out in Natural Wind Environment
Authors: Zheng Rui , Zhao Chuanchao , Kang Jun , Lu Zibao 
Published: March 2021

Abstract
It is difficult for a robot to capture object which is thrown out in the environment with natural wind. Equation of state and measurement of the object in the environment with natural wind is studied. Using the measurement equation and the state equation when there is no natural wind, the average acceleration of the object caused by natural wind can be estimated. Moreover, the variance of the object acceleration caused by natural wind can be estimated using the statistical characteristics and probability distribution of natural wind. Then a method for robot capturing the object based on Kalman filter is proposed. Simulation results show that the trajectory of the object changes obviously when two groups of typical natural wind are used. The object trajectory can be tracked by the robot accurately after it deviates from the object trajectory for about eight sampling periods.
A Monocular Vision Relative Displacement Measurement Method Based on Bundle Adjustment Optimization and Quadratic Function Correction
Authors: Ren Lei , Dong Xiucheng , Liu Dongbo , Zhang Fan 
Published: March 2021

Abstract
In order to meet the requirements of high-precision target displacement measurement, this paper proposed a measurement method based on monocular vision measurement system by which the advantages of simple structure, convenient debugging, easy to install and calibrate is recognized. This method first uses the bundle adjustment algorithm with conditional constraints to optimize the solution results of the orthogonal iterative algorithm, then calculates the relative poses of the optimization results, finally establishes an error correction model to perform secondary optimization on the relative poses. The experimental results show that the method proposed in this paper can reduce more than 54% average error of displacement measurement results, and the error between the final displacement measurement results and the actual displacement values is controlled at 0.4mm level, which proves that the method has good practical value.
A Model of Micro-course Evaluation Based on User Experience
Authors: Sun Yu , Yang Dongmei , Xu Jian 
Published: March 2021

Abstract
At present, researches on micro-course mainly focus on design, development or application, and rarely involve evaluation of micro-course, especially from the perspective of user experience. To this end, from the perspective of user experience, we developed a theoretical model of user experience evaluation of micro-course. Firstly, we introduced the concepts of user experience and micro-course. Secondly, we discussed various research methods, including literature research, expert consultation, questionnaire survey, analytic hierarchy process and other research methods. Finally, based on the above discussion, we developed the theoretical model of micro-course evaluation based on user experience, and then discussed the model in detail.
Möbius Polar Coordinate System Based on Entangled Pull Back of Contradictory Oneself and Its Topos
Authors: Feng Jiali , Feng Jingjuan 
Published: March 2021

Abstract
In this paper, the emergence of the contradiction oneself of object u is not only attributed to a mechanism that opposite transmission between the function x(t) that carrying the location information of u and its returned back x−1 (t−1) and is meeting at a contradiction point, but also is conversed into the questions: “How long time will be taken for the function x(t) transports from own position to v with the velocity

x
˙

(
t
)

, and return back?” It is shown that not only a pair of dual categories and their presheaft and topos can be induced by x(t) and x−1 (t−1), but also a Möbius Entangled Polar Coordinate System can be established by an entangled pull back and a dual of mirror manifolds. In this way, a framework that runs through Philosophy, Information, Mathematics, Physic, Logic to Neural Network can be constructed too.
Manipulator Massage System Based on STM32 Control
Authors: Liu Aike , Zhu Zhishan 
Published: March 2021

Abstract
With the computer gradually become an essential part of People’s Daily life. Long periods of sitting can lead to headaches, dizziness and cervical discomfort. In this paper, a manipulator massage system based on STM32F103 chip is designed to promote the intellectualization and automation of human cervical vertebra massage. Based on the study of human neck and shoulder massage points and massage techniques, the mechanical structure of the manipulator is designed, and SolidWorks is used to design the 3D model.
Nonsingular Terminal Sliding Mode Control for Flexible Spacecraft Attitude Control
Authors: Gu Chengsi , Qu Weidong 
Published: March 2021

Abstract
In this paper, a nonsingular terminal sliding mode control method is applied to design an attitude control law for flexible spacecraft. First, the Lagrange method is applied to establish the dynamic equation of the flexible spacecraft and the vibration equation of the flexible appendages. Then, by designing a nonlinear terminal sliding surface function, the spacecraft terminal sliding mode control law is designed. In order to solve the singular problem, a nonsingular terminal sliding mode control law is further designed. At the same time, the saturation function is introduced to replace the sign function to suppress chattering problem of flexible appendages. The Lyapunov method is used to prove that the involved nonsingular terminal sliding mode control law can realize the precise attitude control of the flexible spacecraft. Finally, a numerical simulation example verifies the effectiveness of the control law designed in this paper.
Construction of Gaussian Integer Periodic Complementary Sequence Set with Zero Correlation Zone
Authors: Liu Kai , Ni Jia 
Published: March 2021

Abstract
Based on aperiodic complementary sequence (ACS) sets and orthogonal matrices, the construction of Gaussian integer (GI) zero correlation zone (ZCZ) periodic complementary sequence (ZPCS) sets is proposed. The constructed GI ZPCS sets can achieve the theoretical bound, and the length of ZCZ can be chosen flexibly. The GI ZPCS sets obtained by this paper can be used in multi-carrier code division multiple access system to obtain higher spectrum efficiency and eliminate interference.
Missense Variants in Human ACE2 May Influence its Binding Interaction with SARS-CoV-2 and Infectivity of COVID-19
Authors: Ge Fang , Muhammad Arif 
Published: March 2021

Abstract
The recent pandemic of COVID-19 is reported as a pandemic and spreads globally. As known, COVID-19 is caused by SARS-CoV-2 and human ACE2 has been reported as the receptor of SARS-CoV-2. Nowadays, as reported, variants in the coronavirus can lead to the transmission across species, in turn, variants of ACE2 may affect the susceptibility of SARS-CoV-2. In this work, we collected and selected critical missense variants in ACE2. Thereafter, we predicted the changes of protein-protein binding affinity, corresponding to each missense variant. According to the results, thirteen variants in human ACE2 exhibit obvious differences. More specifically, six variants (D38E, M82I, Y83F, K353H, R357A, and R357S) in ACE2 are predicted to enhance its interaction with the coronavirus spike protein. In comparison, seven variants (S19P, K31D, Y41A, M82N, M82T, D355A, and D355N) are predicted to inhibit such kind interaction. Accordingly, the final findings of our work may provide evidence that the potential relationship between COVID-19 susceptibility and human ACE2 genetic variants.
Energy Efficient Routing Algorithm Based on Harmony Search
Authors: Liu Yang , Liu Xiaoyu , Liu Chengchang , Liu Minghui , Cheng Qi , Yu Xin 
Published: March 2021

AbstractUnder the premise of limited node energy, an efficient and energy-saving wireless sensor network routing algorithm was proposed to prolong the lifetime of overall network. By analysing the operation pattern of wireless sensor network, the energy model and transmission model was introduced, and BTPHS algorithm based on the above two was proposed. BTPHS algorithm divided the network lifetime into 3 periods. According to the characteristics of the energy distribution and energy consumption in different periods of the network, two new node selection strategies were proposed and a new objective function as a reference standard was provided. The adjustment process of the HS algorithm is abandoned, which makes less parameters in proposed routing algorithm. The experiment results indicate that BTPHS algorithm can prolong the lifetime of overall WSN network effectively.
Investigation of Farmland Soil and Wheat Heavy Metal Contamination Character in Jinding of Lanping
Authors: Zou Liling , Li Changsheng , Lang Xuewei 
Published: March 2021

Abstract
The contents of Cd and Pb in soil and wheat in Jinding of Lanping in Yunnan were investigated and sampled. And single pollution index method, comprehensive pollution index method and correlation analysis were used to evaluate heavy metal contamination in wheat and soil. Zone A is in the upper reaches of the Pijiang River, and the zone does not contain large mines, where soil in the farmland is not polluted by the heavy metals Cd and Pb. The soil in zone B is slightly polluted by Cd and Pb, and the over-standard rate of the Cd of the samples measured is 75%, and the over-standard rate of the Pb of the soil is 25%. The condition of soil polluted by two heavy metals is Cd > Pb, and the heavy metal pollution of the soil in this Zone is mainly affected by mining activities. Zone C is in the lower reaches of the Pijiang River, and the soil in Zone C is not polluted by Cd and Pb. The content of Cd and Pb in the wheat in Zone A reached the standard and was not polluted. The wheat in Zone B was not polluted by Cd and Pb. Although Cd and Pb in the soil in this Zone was over-standard, it could be concluded that Cd and Pb in the soil did not migrate to wheat. The wheat in Zone C was not contaminated by Cd and Pb.
Tectonic Characteristics and Geological Significance of Joints on the Southwest Bank of Yangzonghai Lake
Authors: Huang Qinhui , Wang Jing 
Published: March 2021

Abstract
Affected by the movement of the Xiaojiang Fault Zone, frequent tectonic activities have occurred in the Yangzonghai Lake area, and a large number of joints have developed in the rock formations. The analysis of joints in the study area shows that there are 6 sets dominant joints, of which 4 sets are two conjugate joint systems; the analysis of stereographic projection for conjugate joints shows that the direction of the maximum principal stress indicated by the tectonic stress field in the area has a tendency to turn from NWW to NNW, which is consistent with the tectonic stress field reflected by faults and folds in the study area and and conforms to the characteristics of the tectonic stress field in the middle of the Xiaojiang Fault Zone.
Study on Energy-saving Method of Microwave Monitoring for Detecting Human Physical Body and Shielding Interference from Regular Motion Objects
Authors: Yang Zhaolin , Shao Lanyun , Liang Lihua , Zhou Mei 
Published: March 2021

Abstract
This paper explores a method of detecting human body by microwave that avoids the interference of regular motion. It can accurately detect the presence of human body in the presence of interference of regular moving objects, and is applied to the energy-saving control of power sockets to achieve energy-saving control. This method can also be used in water-saving control. This method solves problems related to resource waste in public buildings, especially problems in classrooms and offices in colleges and universities where there are ever-lasting lights air-conditioning and no people there other waste problems, which improves the level of scientific management, and saves a lot of energy. It can not only solve the problem of energy saving and control, but also realize the safety utilization of power of the device. According to the statistics, it can be guaranteed that there are more than 30% saving energy with low input. This method makes great contributions to environmental protection and social security. This method can be further promoted to be appiled to any control system which requires accurate human physical body detection and shielding interference from regular motion object, which will be progressively integrated into building clusters and municipal facilitie. It can also achieve data sharing, information interaction and centralized control of energy of the whole city.
Optical Classification of Coastal Water Body in China using Hyperspectral Imagery CHRIS/PROBA
Authors: Wang Qing , Zhang Zhengke , Hao Zengzhou , Liu Bingling , Xiong Jilian 
Published: March 2021

Abstract
Coastal saltern and aquaculture are vital components of human-made coastal areas and they have immense influence on the coastal water environment in China. Hyperspectral space-borne remote sensing is a significant technology in remote sensing, enabling in-depth identification and discrimination of the spectra from water features on shore. The study uses CHRIS/PROBA images to identify water-bodies and classify six optical water types from artificial and natural water in three sites across regions along China’s coastline. Most of the offshore waters are affected by the inflow of land source materials. The fluorescence peaks appearing at 675 nm can be observed by 5 water types. In addition to Class 1 water which is far from the shore and the Class 4 water whose signals are mainly affected by the algae at its bottom, the other 4 kinds of water show backscattering peak after 800 nm, suggesting that particles are playing an important role in coastal water. For coastal waters in Liushagang, the mangrove forest will transfer the water body signal received by the satellite into the vegetation signal; pools in coastal saltern have rather shallow water during production period when the benthic signal will seriously interfere the reflected signal. In the intertidal area, the hyperspectral characteristics in the same sample also change periodically due to the ebb and flow. The Class 2 and Class 3 water bodies alternately occur in the intertidal zone in the Lianyungang research area. Therefore, it is concluded that optical classification approaches reflect the advantages of remote sensing from Satellite-bone, and our study can be helpful and conductive for follow-up sensors.
Study on Land Use Change and Land Ecological Security in Zhoushan Archipelago
Authors: Chen Junling 
Published: March 2021

Abstract
The purpose of the manuscript is to evaluate the land use change and land ecological security of Zhoushan Archipelago from 1995 to 2017, and to predict the land ecological security status from 2021 to 2025 to guide the intensive and ecological use of island land. Obtain the utilization status of 6 land-use types in Zhoushan Archipelago in 1995, 2000, 2005, 2010, 2015 and 2017 by using 12-view Landsat satellite remote sensing image data, the DPSIR-EES model was used to establish index system, the weight of each index was determined by entropy method, the multi-factor comprehensive weighting method was used to calculate ecological security index. The results showed that: the area of construction land in Zhoushan Archipelago continued to increase from 1995 to 2017, mainly through the occupation of grassland/cultivated land. Grassland/ cultivated land area decreased by 22.54%, and tidal flat area decreased by 62.66%. The land ecological security index in Zhoushan Archipelago showed an increasing trend, the security level raised from unsafe level to general security level. Conclusions are that land ecological security of Zhoushan Archipelago was generally good during study period, it is necessary to deal with the relationship between island land use and ecological environment protection in the future, and realize the symbiotic linkage between island economic and social development.