Table of Content

15 December 2022, Volume 7 Issue 12

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A High-Order NAD-SPRK Algorithm Based on the Two Dimensions Elastic Wave Equation

Chen Li, Zhu Xingwen, Zhang Chaoyuan

2022, 7(12):  1-7. 

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Based on the two dimensions elastic wave equation with the Hamiltonian system， an eighth-order NAD-SPRK algorithm is obtained by combining the NAD operator for higher order partial derivatives of discrete space and the symplectic partitioned Runge-Kutta algorithm of discrete time derivative. The stability conditions， numerical dispersion and computational efficiency of the algorithm are studied theoretically and numerically. The results show that compared with the fourth-order NSPRK algorithm， the eighth-order Lax-Wendroff algorithm and the eighth-order staggered grid algorithm， the eighth-order NAD-SPRK algorithm is significantly superior to the traditional numerical algorithm in suppressing the numerical dispersion， and has the minimum numerical error and the highest computational efficiency.

Comparative Study of Garbage Image Classification Models Based on Transfer Learning

NiuYitong , Meng Deyao , Wu Ronghai, Ren Guopeng, Yang Dengqi

2022, 7(12):  8-14. 

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Many deep neural network models have been applied to automatic identification and classification of garbage images and have achieved good results. Current mainstream deep neural networks include attention mechanism-based neural networks and convolution-based neural networks. The existing research on garbage classification is mainly based on convolution-based neural network model， while the attention mechanism-based neural network model has not been tried in garbage classification. Which of these two types of deep neural networks performs better on small-scale garbage classification data sets is worth exploring. A systematic comparative study of several representative models shows that compared with convolution-based neural network model， the deep neural network model with pure attention mechanism on small-scale garbage classification data sets shows better performance， which provides a reference for garbage classification model selection. 

Research on Face Recognition Technology Based on Fusion of Local Features and Global Features

Xu Fei

2022, 7(12):  15-19. 

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In order to solve the problem of low recognition rate caused by the interference of irresistible factors， a system is constructed to collect local and global features of face images and fuse them for recognition. The principal component analysis （PCA） and local binary pattern （LBP） are used to extract the global feature matrix and LBP local feature spectrum of the image， respectively， to construct an associated set of face image sets and extract face feature values. The recognition effects of a single PCA algorithm and a PCA+LBP algorithm in different dimensions and different sample numbers are compared through the ORL database face image set. At the same time， a GUI interface based on support vector machine algorithm and Matlab is designed to open， train， recognize and classify face images. The results show that the accuracy of face recognition can be improved by the fusion of local and global extracted feature values， and the face recognition system of GUI interface can meet the application requirements.

A Branch and Bound Algorithm to Solve Express Vehicle Assembling Problem

Zhao Qinyi, Zhao Yuqin

2022, 7(12):  20-24. 

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Express vehicle assembling problem refers to the fact that vehicles bring the goods with the greatest value back to the distribution center when delivering goods at each express station. A branch and bound algorithm with bound function is proposed to solve the problem. The nodes to be processed in the search tree are stored in a heap structure， and the search paths are stored in the nodes. The lower bound of search is used to prune the search tree， and the experimental results verify the effectiveness of the algorithm.

Heterogeneous Database Security Synchronization System Based on GAP

Huang Liusong, Zhang Fei, Zhang Xuefeng, Ｗu Huilin

2022, 7(12):  25-30. 

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In the field of industrial control， because of the security requirements of border protection， the GAP technology is widely used in the physical isolation between production control area and management information area. Data synchronization between heterogeneous databases is a common application scenario in industrial production. In view of the application environment with physical isolation GAP， this paper puts forward a data synchronization method for databases by shielding the security isolation devices and the heterogeneous differences between databases on both sides in the case of cross security zones. This paper describes the synchronization principle of heterogeneous databases in the GAP environment by providing details of data change detection， data encryption and compression， and coding fusion. Finally， the experiment verifies that the proposed method can achieve the goal of data security transmission in heterogeneous databases.

Design and Practice of Blended Teaching Mode of "Data Structure"

Zhang Xiaoling, Dong Wangui, Zeng Xin, Li Yi, Yang Haichao

2022, 7(12):  31-36. 

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 "Data structure" is the core basic course for computer science and technology. By analyzing the current teaching situation and existing problems of the course， using online high-quality educational resources and teaching tools， the overall planning is made from three aspects： the course content， practice system and assessment mechanism， and a blended teaching mode is designed， in which multiple links are intersected and organically combined. A comparative analysis of the students' achievements before and after the implementation of this mode shows that this mode can effectively promote the achievement of teaching objectives， and the teaching effect is good.

Research on Construction Workers' Safety Protection Equipment Wearing Detection Based on YOLOv5s

Zhao Enming, Yang Song, Luo Chuang, Liu Guangyu, Zhu Xiaoliang

2022, 7(12):  37-42. 

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To solve the problem of irregular wearing of safety helmets and masks by construction workers' during operation， the YOLOv5s algorithm is used to detect the wearing of safety protection equipment for construction workers to reduce the probability of safety accidents. The YOLOv5s algorithm is combined with the embedded platform Jetson Nano， and the TensorRT technology is used to improve the detection frame rate of the YOLOv5s algorithm. The mAP value of the final model is 0.946， and the detection frame rate on the Jetson Nano is 12.83 FPS. The YOLOv5s algorithm is applied to the field of construction site safety assurance， which realizes effective monitoring of the wearing of construction workers' helmets and masks， and meets the needs of detection speed and portable installation of equipment in practical applications.

WeChat Public Platform Helps the Teaching Reform of "Biomedical Engineering" #br#

Zhang Junpeng, Zhao Chunwen, Zhou Chichun, Yang Yanting, Li Sijing

2022, 7(12):  43-46. 

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Curriculum teaching reform is a required course for the university teachers， and also a basic guarantee for improving the quality of talent training in a university. In order to understand the necessity and significance of building a curriculum WeChat public platform， biomedical engineering majors were investigated and analyzed in the form of questionnaires. The survey results show that the university students majoring in biomedical engineering generally use WeChat and accept the curriculum WeChat public account， so it is necessary to build a curriculum WeChat public platform to assist in the teaching reform of "Biomedical Engineering". In order to make the public platform of WeChat better help the teaching reform of "Biomedical Engineering"， this paper expounds the curriculum contents and teaching methods. According to the results of the questionnaire and the contents of the curriculum teaching reform， a basic framework of the curriculum WeChat public platform is designed to promote the curriculum teaching reform of "Biomedical Engineering".

Effects of Sowing Date on the Yield and the Utilization of Nitrogen and Phosphorus Nutrients of Maize in Erhai Lake Watershed

Lu Jia, Deng Dan, Li Xue, Xia Yurong, Jia Junzhuang, Wang Tao, Hu Xiaokang

2022, 7(12):  47-52. 

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Objective： To investigate the suitable sowing date of two maize varieties in Erhai Lake watershed， and to provide guidance for maize production in this region. Methods： Through field experiment， two maize varieties "Xianyu 335" and "Zhengdan 958" were selected as the research objects， and two sowing dates were set. Results： The highest yield of the two varieties were sown in June， of which the yield of "Xianyu 335" and "Zhengdan 958" were 16 580 kg/hm2 and 15 706 kg/hm2， respectively， which were higher than those of other maize varieties sown in Erhai Lake watershed. When the sowing date was postponed to July， the yield of "Xianyu 335" decreased by 36.4%， and the nitrogen and phosphorus uptake of the aboveground part decreased by 52.1% and 46.4% respectively. The sowing date had no significant effect on "Zhengdan 958". Conclusion：The introduction of "Xianyu 335" and "Zhengdan 958" and their sowing in June will help to increase the yield of maize in the study area and promote the absorption and utilization of nutrients by maize. From the perspective of reducing nitrogen fertilizer input and improving nitrogen fertilizer utilization efficiency， "Xianyu 335" is a better choice.

Research on Color Retention of Gerbera jamesonii by Drying

Jiang Jun, Kong Lingfang

2022, 7(12):  53-59. 

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Using red Gerbera jamesonii as experimental material， different kinds and concentrations of color retention agents were used to treat Gerbera jamesonii for color retention at different times， and two methods of natural drying and sodium chloride embedding were used to dry Gerbera jamesonii， so as to select the appropriate dry color retention method. Results： The sensory score of 5% sucrose +10% tartaric acid solution in the two drying methods was the highest after 11 h treatment. The softening degree was 10% tin chloride solution > 5% sucrose +10% tartaric acid solution > 10% citric acid solution. The color of petals of Gerbera jamesonii treated with 5% sucrose +10% tartaric acid solution for 11 h under two drying methods was the closest to that of fresh flowers. Under natural drying， the color difference of 5% sucrose +10% tartaric acid solution for 11 h was the smallest， and that of 10% tin chloride solution for 11 h was the largest. Under the condition of sodium chloride embedding and drying， the color difference of 5% sucrose +10% tartaric acid solution for 11 h was the smallest， and that of 10% citric acid solution for 14 h was the largest. The results showed that the best formula for color retention of Gerbera jamesonii was soaking in 5% sucrose +10% tartaric acid solution for 11 h， and embedding drying can achieve good anti-wrinkle effect.

Research on Joint Training Mode of Governments， Industry Associations， Enterprises and Universities for Excellent Agricultural and Forestry Talents in Local Universities：

Taking the Horticulture Major of Dali University as an Example

Feng Yuan, Su Hongyan, Yang Liquan, Wang Tao, Hu Xiaokang, Mao Benyong

2022, 7(12):  60-64. 

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Taking the horticulture major of Dali University as an example， this paper discusses the joint training mechanism of excellent agricultural and forestry talents in the cooperation of local universities with the governments， industry associations and enterprises. According to the needs of modern agriculture and new rural construction， the joint training mechanism of excellent agricultural and forestry talents takes the cultivation of high-quality application-oriented innovative talents as the core and focuses on the training of practical skills and innovative ability. The governments， industry associations， enterprises and universities jointly adjust and optimize the talent training scheme， reform the curriculum system， build a diversified practical teaching platform，strengthen the construction of "double qualified" teachers， and effectively improve the training quality of excellent agricultural and forestry talents.

Construction of Investment Strategy in Chinese Stock Market under the Impact of the Pandemic：

Based on the Perspective of Complex Network

Hong Zhenmu, Zhao Jie

2022, 7(12):  65-70. 

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The COVID-19 has brought a negative impact on China's stock market. Taking 300 constituent stocks of Shanghai and Shenzhen as observation samples， this paper analyzes the volatility of China's stock market under the impact of the pandemic from the perspective of complex network. Based on the Euclidean distance of stock correlation coefficient vector and the community division of stock correlation network， an investment strategy is proposed. The effectiveness of the strategy is analyzed through comparative experiments. It is found that there is a time lag in the transmission of the impact of COVID-19 in the stock market. Choosing stocks in different communities from stocks with small Euclidean distance can effectively spread the risk. The investment portfolio made under the guidance of this investment strategy will achieve better investment results in the next year， providing a reference for investors' investment management.

Comparative Study of the Main Function Differences of Physical Education Teachers in Urban and Rural Primary and Secondary Schools in the New Period

Wang Xiaolin

2022, 7(12):  71-77. 

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In order to make physical education teachers in urban and rural primary and secondary schools play a core leading role in building a high-quality education system in the new period， we should rationally analyze the differences between urban and rural roles in their main functions，and accelerate the construction of high-quality physical education teachers in urban and rural primary and secondary schools. By using the methods of literature， network inquiry and logical analysis， etc， this paper makes a systematic analysis of the main function of physical education teachers in urban and rural primary and secondary schools in the new period. The connotation and types of the main functions of physical education teachers in urban and rural primary and secondary schools （2 categories， 7 sub-categories and 30 sub element functions in total）， the types （6 types）， characteristics （30 types）， theoretical basis （6 types）， differences in performance （39 types）， and root causes of problems （3 categories and 32 types） of urban and rural role differences are proposed. There is a positive correlation between the main functions and the role differences， and the correction strategy is proposed from four aspects， to promote the main function of physical education teachers in urban and rural primary and secondary schools.

Research on the Integrated Development of Traditional Sports Culture and Tourism of Bai Nationality in Dali

Hou Guoliang, Rong Xiaowen, Zhao Lihua

2022, 7(12):  78-85. 

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By using the methods of literature and field investigation， a field investigation and analysis of the integration of Bai traditional sports culture and tourism are carried out. The research concludes that： Bai traditional sports culture and tourism resources have a strong integration foundation， and the integration mode mainly includes festival integration， events integration and performances integration. This paper proposes to make full use of a variety of resources for integrated and supporting development， build a national traditional sports tourism culture development system based on the "integration of production and education， school-enterprise cooperation" in colleges and universities， vigorously develop projects with national characteristics and advantages， build brand culture to enhance popularity， etc.， and make national sports tourism better help rural revitalization.

Research on the Reform of the Evaluation Method of Students' Achievements in  "Basketball" Course for Physical Education Majors

Jiang Sen

2022, 7(12):  86-90. 

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Since the outbreak of the COVID-19， online teaching was adopted for physical practice courses， and the assessment of the "basketball" course could only be conducted by submitting videos. It was found that the students' practical examination scores had been greatly improved compared with the past. From the change of evaluation methods leading to the change of students' attitudes towards assessment and learning， the impact of evaluation methods on teaching quality and teaching effect was analyzed. Thus， the improvement and perfection of evaluation methods can be promoted in reverse， and ultimately the improvement of teaching quality and teaching effect can be directed. It is conducive to the formation of students' sports skills and the improvement of their sports ability， so as to improve the achievement of training goals.

Study of Effects of Ideological and Political Education in Sports Dancing Course on College Students' Self-Ｃonfidence and Well-Ｂeing

Hu Xianhe, Cong Canri, Zhao Dongyong

2022, 7(12):  91-95. 

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To explore the effects of ideological and political intervention in sports dancing course on college students' mental health， by using psychological measurements and mathematical statistical methods， a survey of 240 college students on whether there is  ideological and political intervention in sports dancing course. The results show that the ideological and political education in sports dancing course is better than that of no ideological and political education in improving college students' self-confidence and subjective well-being， and there is no gender difference. There is no significant correlation between self-confidence and subjective well-being.

The Spatial Distribution Pattern of Nematode-Trapping Fungi in Dayingjiang River

Zhang Xin, Deng Wei, Zhu Yajiao, Yang Xiaoyan, Xiao Wen, Li Na,

2022, 7(12):  96-100. 

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To explore the distribution patterns of Nematode-Trapping Fungi （NTF） in the upper and lower reaches of the watershed， Dayingjiang River was chosen as the study area， 30 samples of aquatic sediment and riverbank terrestrial soil were collected from the upper， middle and lower reaches of the Dayingjiang River. Isolated NTF by bait plate method， combined with morphological and molecular biology methods to identify the resulting strains. A total of 19 NTF strains belong to 1 genus and 9 species were identified. The results display that the occurrence frequency and diversity index of NTF in the Dayingjiang River is the highest in lower reaches， followed by the middle and upper reaches. Of these， Arthrobotrys oligospora is distributed only in the upper reaches， A.eudermata is distributed only in the middle reaches， A. thaumasium， A. sinensis， A. rutgeriense and A. conoides are distributed only in the lower reaches. The results show that there are distribution differences in the upper and lower reaches of the watershed， and the convergence of water flow is one of the important driving factors for this distribution difference. The lower reaches of the watershed may be the collection place of microbial communities.