Table of Content

26 May 2022, Volume 41 Issue 3

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A Weighted K-means Clustering Algorithm and Its Application

SHEN Xiujuan, XUE Shuo

2022, 41(3):  1-7. 

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K-means clustering method is one of the classic and widely-used clustering analysis methods because of its fast execution efficiency and simple algorithm.However, the traditional K-means clustering algorithm does not consider the importance of each index while the importance of each index is different and it should be treated differently. This paper improves the traditional K-means clustering method and proposes a weighted K-means clustering algorithm in order to verify the superiority of the improved algorithm, we take iris as the experimental data, and set up three experiments for comparative analysis. The experimental results show that the weighted K-means clustering algorithm converges faster, the classification result is closer to the original classification, and the effect is better. In order to further illustrate the practicability of weighted K-means clustering algorithm, this paper takes some indexes of 103 colleges and universities as experimental data, and uses the algorithm for clustering analysis.

Limit Cycles for a Class of Perturbed Seventh Order Hamiltonian Systems

ZHANG Jingtao, YU Qiuli, HONG Xiaochun

2022, 41(3):  8-11. 

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The limit cycles of a class of seventh order hyperelliptic Hamiltonian systems with nilpotent singular points under the perturbation of seventh degree polynomial are studied to find that the system has three limit cycles in the unbounded ring domain, and the specific positions of these limit cycles are simulated by using the detection function and numerical simulation method.

Approximation of Quasi-interpolation Operator by B-spline

GUO Hongyan

2022, 41(3):  12-15. 

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The spatial approximation was studied and obtained by using the the B-spline interpolation operator based on the deduced combination of the and Jackon type theorem and then the higher approximation order is obtained in classical space.

Species Identification and Diversity Investigation of Bambusicolous Ascomycetesin in Yunnan

DAI Dongqin, HAN Lisu, JIN Xingchen

2022, 41(3):  16-28. 

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Bamboo forests are widely distributed in Yunnan. Numerous fungi inhabit on bamboo host, most of which are ascomycetes. In this study, the species diversity and distributions of bambusicolous ascomycetes were investigated based on the data collected from central, south, northeast and northwest of Yunnan. Fungal isolation, DNA extraction, sequencing and identification were carried out. Totally, 300 samples were collected, and pure cultures were obtained by using methods of single spore isolation and tissue isolation. Seventy-four species were identified based on molecular analyses. Bamboo ascomycetes distributions of each area of Yunnan were statistically recorded. The research shows that fungal species diversity in the southern area is relatively rich, however, in the northwest of Yunnan, it demonstrates lower due to the high altitude. The species diversities in classes, orders, families and genera were carried out to show that species mainly belong to classes Dothideomycetes, Sordariomycetes and orders Botryosphaeriales, Hypocreales, Pleosporales and Xylariales. The most widely distributed families are Apiosporaceae, Bambusicolaceae, Botryosphaeriaceae, Roussoellaceae and Xylariaceae. Arthrinium, Bambusicola and Roussoella were the most widely distributed genera. Members of Arthrinium and Botryosphaeriaceae are common plant pathogens. The discovery has reference value for plant disease control and resource conservation.

Composition and Diversity of Vascular Plants in Cuifeng Mountain

HAN Lihong, TANG Shixiang, YANG Caijing, REN Yiyuan, LIU Chao

2022, 41(3):  29-41. 

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The plant species composition, diversity changes and floristic characteristics of Cuifeng mountain in Qujing, Yunnan were analyzed based on the results of field survey from 2019 to 2021 to provide the basic data for the protection of plant species diversity in this area. The results showed that there were 301 species of vascular plants, belonging to 88 families and 222 genera, with Pinaceae, Rosaceae and Asteraceae being the dominant families, and Pinus, Magnolia and Sabina are the dominant genera; that the richness of plant species decreased with the increase of altitude; and that the index of species richness of sample plots at 2100 m and 2200 m is low, which may be resulted from the higher altitude area of Cuifeng mountain being mostly covered by shrubs, and the canopy density being higher. Hitherto, the above reasons may cause the decline of herb diversity on the understory. There are abundant floristic components in this area. Among the distribution types, the temperate geographical distribution of plant genera is the largest (61.89%), and the temperate components are more than the tropical one. The R/T value of these two types is 1.62. The distribution is dominated by temperate geographical components and supplemented by tropical components, and tropical and temperate components permeate each other with obvious transition characteristics.

Altitudinal Distribution Patterns of Subalpine Meadows Biodiversity in Northeastern Yunnan

YU Long, QIN Xue, MA Mei

2022, 41(3):  42-45. 

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Altitude gradient is one of the most important factors that determine the distribution patterns of biodiversity, and the relationship of species diversity and altitude gradient has always been a hot topic in ecological research. In this paper, the subalpine meadow in Dahai Mountain, Huize County, Northeastern Yunnan was taken as the research object, and the distribution patterns of biodiversity along the elevation gradient were discussed through field quadrat investigation and statistical analysis. The results showed that the species richness, Shannon-Wiener index and Pielou index of the alpine meadow plant communities in Northeastern Yunnan decreased significantly with the increase of altitude along five altitudes from 3 150 to 3 950 m (P< 0.05), and the species diversity showed a significant downward trend.

Development of SSR Markers for Molecular Identification of Amorphophallus Species

GAO Yong

2022, 41(3):  46-52. 

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Genus Amorphophallus are perennial herbs that belong to the Araceae family. For the high glucomannan content in the underground corm, several species in this genus have been planted in many Asian countries, such as China and Japan. Although there is a long history of cultivation in China, the molecular identification method of Amorphophallus species is still not available, which hinders the plantation industry. Simple sequence repeat (SSR) has been considered as one of the powerful and informative molecular markers in identifying species and crop varieties. In this study, SSR markers of Amorphophallus species were developed by using restriction site-associated DNA sequencing, and 12 screened polymorphic markers were used for identifying four Amorphophallus species. The results showed that the allele number of 12 SSR markers ranged from two to four. These SSRs could distinguish A. yunnanensis and A. tonkinensis from the rest two species. This study gives hints to the molecular identification of Amorphophallus resources in the future.

Investigation and Analysis of Konjac Germplasm Diversity in Yunnan Based on Questionnaire

WEI Xiaomei, HE Fang, WANG Guxian

2022, 41(3):  53-59. 

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A questionnaire was designed to explore the cultivation status of Konjac and provide background support for the development of KGM, alkaloids and other related products in Yunnan. The results showed that the Konjac were cultivated scatteredly under the grove or grown with the corn except in Zhaotong and Fuyuan in Yunnan; that 42% cultivated variety are Amorphophallus konjac K.Koch, about 20% Amorphophallus albus P.Y. Liu & J.F. Chen; that 44.21% of the farmers plant with self-contained seed, and 36.44% farmer choose to buy Konjac seed in the market; that 50% farmers choose farmyard manure to grow Konjac; and that the soft rot infection rate of Konjac was as high as 26.72% with dry leaf disease next. At present, Konjac planting in Yunnan has begun with small scale and the investigation may provide ideas for the planning of Konjac industry and the development of Konjac products in Yunnan .

Simulation Research of Mobile Fading Channel Based on Matlab GUI

XIE Wendi, WANG Enliang

2022, 41(3):  60-66. 

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A fast simulation platform of mobile fading channel is designed by using GUI tool in Matlab to help people better understand the fading characteristics of mobile channel. The platform can manually select channel types and input channel parameters, and realize the simulation of Rayleigh fading, Rice fading and Nakagami fading channels with different synchronization length and fading coefficients.The effects of flat attenuation and frequency selective fading characteristics on signal transmission are analyzed through the simulation of constellation diagram and power spectral density by the case study of QPSK, 16QAM and 64QAM. The practice shows that the platform is simple in operation, flexible in parameter setting, intuitive and good in visualization, which lays a theoretical foundation for communication system analysis.

Design and Implementation of Network Security Access Control Based on ACL and Firewall

XING Huifen, CHE Hui

2022, 41(3):  67-74. 

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With the rapid development of the Internet, network security problems have become increasingly serious. ACL, OSPF, MSTP and other technologies are applied for designing network security access control schemes to solve the network security of small and medium enterprises by designing the three-tier network architecture and selecting the network equipment to complete the network construction and configuration and using the eNSP simulation experiment, which is proved effectively to control specific users’ access to the network switch and filter common attacks so that enterprise network security is guaranteed.

A Joint Salience Detection Algorithm Based on Multi-image Foreground Correspondence

LIU Lei

2022, 41(3):  75-81. 

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A joint salience detection algorithm based on foreground correspondence for multiple images is proposed to filter the redundant information in the image. The accurate foreground region is selected from the convex hull by using the boundary continuity, and then the corresponding foreground region is fused with the background based salience map to generate the final joint salience map. The results show that the minimum value of joint salience map can reach 0.071 because of other algorithms and the MAE value of single detection salience map, which indicates that the foreground correspondence salience detection algorithm combined with background has good detection ability in multi-image detection, and has important research significance and application prospect in the field of computer vision.

Resource Endowment, Direct Foreign Investment and Urban and Rural Income Gap:Panel Data Model Based on 12 Western Provinces

SUN Liping, YANG Jun

2022, 41(3):  82-88. 

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The influence mechanism of resource endowment on urban-rural income gap was systematically analyzed with foreign direct investment as the intermediary variable based on the panel data of 12 western provinces from 2008 to 2018 . The empirical analysis shows that after controlling economic growth, structural optimization, government intervention and other factors, resource endowment does expand the income gap between the urban and rural residents in the western region, proving that the resource curse is in the western region and that foreign direct investment has a significant negative effect on the income gap between urban and rural areas, and plays a partial intermediary role in the impact of resource endowment on the income gap between urban and rural areas.

Regional Differences and Coordination of Tourism Economy in Yunnan

CHEN Xiqiong

2022, 41(3):  89-96. 

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The regional difference degree of tourism economy in Yunnan from 2008 to 2019 is analyzed and decomposed by taking the total tourism income (100 million yuan) of Yunnan and 16 prefectures and cities as the important analysis index by using the statistical methods of mean value, standard deviation, coefficient of variation and Theil index analysis according to the four regions(central, northeastern, southwestern and northwestern Yunnan). The causes of the differences are empirically analyzed and the coordination countermeasures are put forward by using the grey correlation analysis model and principal component analysis method.

Exploration and Practice of the Blended Teaching Based on OBE:A Case Study of Basic Ecology

SHI Guoxi, ZHOU Xiangjun, WANG Jing

2022, 41(3):  97-102. 

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The OBE concept and hybrid teaching model have formed a complete theoretical system and implementation model after many years of practice, but the organic combination of the two has been little reported. The teaching content of the Basic Ecology is divided into high-level questions and low-level questions based on the OBE concept. Two types of teaching strategies are put forward at four levels--before class, during class, after class, and course assessment based on these two questions. Finally, a questionnaire is used to investigate students' satisfaction with the achievement of course goals. The results show that the hybrid teaching model based on the OBE concept can force the improvement of students' learning process through the output of learning results, and provide a new paradigm for the teaching of Basic Ecology courses.

Matching Study between Speciality Selection and Regional Industry:Based on the Pilot Professional Analysis of Modern Apprenticeships at National Level in Guangdong

DENG Zhenhua

2022, 41(3):  103-113. 

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The matching relationship between professional settings and regional economic development is a key issue in the field of vocational education.The National Vocational Education Reform Implementation Plan puts forward specific requirements for the development of the industrial development of vocational schools.Taking Guangdong Province's participation in the national modern apprenticeship pilot majors and schools as the research object, this paper analyzes the current situations and problems of the current modern apprenticeship pilot in Guangdong Province from the aspects of the distribution of pilot professional categories, the level of pilot professional schools, the nature of pilot schools, and the distribution of pilot schools, combined with the industrial development pattern of "one nuclear, one belt and one zone" in Guangdong. In the face of the new situation and new requirements of development in regional economic and vocational education, the article proposes to reflect on the relationship between modern apprenticeship professional selection and regional economic development in the process of the new round of professional construction, the nature of pilot schools, and the matching of pilot professional training specifications with the structure of talent demand.

Strategic Choice for Promoting the Development of Campus Football Based on AGIL Model

CHEN Xiuyu, JING Longjun

2022, 41(3):  114-121. 

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As a breakthrough in the reform of school sports in China and one of the important carriers for the development of youth sports, campus football is a tower base for revitalizing Chinese football and building a strong football nation. It is of great significance for accelerating the construction of a strong sports nation in China. The Parson’s AGIL model was used to analyze “quaternity” of campus football in China environmental adaptation, goal positioning, resource integration and model maintenance. The analysis reveals that the development environment is hindered, the orientation positioning is blurred, the resource protection is insufficient, and the cultural construction is blurred, which is the dilemma that affects the development of campus football in China. Campus football needs to be based on national strategies to achieve adaptive functions, to be guided correcting values, to achieve the goal-achieving function; to supplement social forces to achieve integrated functions, and to use football culture as a medium to meet the four major functional requirements of the system. The revitalization of Chinese football can be accomplished by realizing the way of dimension function to promote the healthy and sustainable development of campus football to provide inexhaustible impetus for the development of campus football.

Inheritance and Development of National Traditional Games of Ethnic Groups in Yunnan

WU Minglin, MA Jun, FENG Qiang

2022, 41(3):  122-128. 

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Mathematical statistics and analysis on the place, time, project setting, scale and results of traditional ethnic games held in Yunnan Province are conducted by using the method of literature, mathematical statistics and logical analysis. The results show that the venue and time of the event were not fixed; competition items increase year by year; performance items increase the mostly; the number of gold medals won by men was positively correlated with the number of gold medals won by women; the overall scale of the games is on the rise; and the competitive strength of the national games is not consistent with the level of social and economic development. Therefore, the games of ethnic groups in Yunnan can be innovated by setting the holding time in combination with national festivals, highlighting featured projects and diverting competition venues, and tracing the origin of ethnic origin to stimulate the development of tourism push the games to national movement.