Table of Content

    25 September 2020, Volume 41 Issue 5
    Mathematics
    Method of Proving Definite Bound Function on Variable Interval as Continuous Function
    XING Jiasheng, WU Sang, YANG Yichuan
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  1-4. 
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    We study the continuity of the definite bound function of continuous function on the variable interval. With correspondence between the variable interval and the unit interval, the definite bound function on the change interval is expressed as the definite bound function on the unit interval. With the subtraction inequality of upper bounds of two functions and the uniform continuity of the function, it is proved that the definite bound function is uniformly continuous.
    Lower Bound for the Smallest Singular Value of H-Matrices
    FU Youming
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  5-8. 
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    A lower bound for the smallest singular value of a Nekrasov matrix is derived and then the lower bound is applied to H-matrices. The numerical results show that the new estimation is effective.
    Almost Sure Central Limit Theorem for Random Sum of NA Sequences
    JING Zhaojing, ZHANG Yu
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  9-13. 
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    The almost sure central limit theorem for the random sum of NA sequences is proved with the property of subsequence convergence. The almost sure central limit theorems is also proved under the weight conditions of 〖SX(〗1〖〗j〖SX)〗,〖SX(〗logλj〖〗j〖SX)〗 (λ>-1) and 〖SX(〗elog αj〖〗j〖SX)〗(α∈[0,1]).
    Computer and Automation
    Online Examination and Practice System for Java Programming
    CHEN Min, TANG Huiyi
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  14-18. 
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    An online examination and practice system was designed and developed for the key course Java Programming in computer software engineering major in university. The system not only realizes the main functions of the online examination system, but also adds various practical features to meet the specific examination requirements, making itself applicable for  adapt to various examination environments and flexible examination forms.
    Mirror Extreme Learning Machine Based on Denoising Autoencoder
    LONG Qiuqing, LIAO Bolin, YIN Yumin
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  19-25. 
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    A mirror extreme learning machine (MELM) is designed aiming at the problem that a large number of hidden layer nodes are needed to guarantee the classification performance of the extreme learning machine(ELM) in the high-dimensional and noisy data set. The MELM uses the pseudo-inverse method to determine the input weights, and randomly generates output weights and biases. When classifying data, it requires only a few hidden layer nodes. In order to improve the classification performance and noise immunity of the MELM, it is combined with a denoising autoencoder (DAE). The DAE is used to extract features from the input data, and the extracted features are used as the input data of the MELM, and finally the  network training is triained. In the noiseless and noisy MNIST, Fashion MNIST, Rectangles and Convex data sets, the MELM based on the DAE is  compared  with the algorithms ELM, PCA-ELM, SAA-2 and DAE-ELM. The experimental results show the superiority of the algorithm: the MELM based on the DAE uses the least number of hidden nodes in the network for classification, and the overall performance is the best.
    Design of Low Speed Driving Warning System for Electric Vehicles Based on MKE06Z64
    XIANG Nan, ZHU Jie, GE Shengsheng
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  26-31. 
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    In order to solve the problem of traffic accidents caused by no warning  sound in low-speed driving of electric vehicles, the author designs a low-speed driving warning system of electric vehicles based on MKE06Z64. The system mainly consists of main control module, power supply module, CAN module, LPF module, power amplifier module and storage module (standby) and so on. The main control module receives instructions from the CAN bus of electric vehicle, and then analyzes the instruction information to obtain vehicle condition information such as gear position, speed, enabling signal and audio source selection. Finally, the main control chip finds the corresponding sound source according to these information, and outputs the warning sound by PWM.
    Physical and information
    Quantitative Analysis of Thermal Performance Parameters of Layered Semiconductors MoSe2 and WSe2
    PENG Chun, YANG Xuexian, HUANG Yonggang, WANG Xiaoyun, PENG Jinzhang
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  32-36. 
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    Based on bond order-length-strength theory and local bond average approach, the thermal parameters of the transition metals MoSe2 and WSe2 were quantitatively analyzed, and the functional relations of thermal expansion coefficient (TEC), lattice constant, thermal strain and temperature were established.It reveals the physical mechanism of the temperature effect of the thermal parameters of the layered semiconductor material: TEC is directly proportional to the Debye temperature and specific heat capacity, and is inversely proportional to the atomic cohesive energy. The lattice constant, thermal strain and temperature are linear when the temperature is higher than one third of the material's Debye temperature. Debye temperatures of MoSe2 and WSe2 were 276, 260 K.
    Image Registration Based on Spatial Adaptive Total Variation
    ZHANG Qunyi, YANG Fenlin
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  37-40. 
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    A discrete spatially adaptive total variation image registration model is established by introducing spatial adaptive regularization parameters, and an effective fixed point method is given by combining the first-order Taylor expansion. Experimental results show that the image obtained from the spatial adaptive total variation registration model has better quality and requires less iterative time than the total variation registration model.
    A New Discrete TVp Model
    PENG Ying, YANG Fenlin
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  41-44. 
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    The adaptive TVp model can effectively avoid the staircase effect of TV model, but the nonlinear degree of the model is relatively high, so it is difficult to solve it. In order to solve this problem, a new discrete TVp model is established by using the geometric mean of the forward and backward difference of the gradient of each pixel to define the gradient mode of the pixel. The model can effectively reduce the nonlinear degree of TVpmodel, and the image recovered has better quality and higher signal-to-noise ratio than the TVp model.
    Biological
    Researches and Prospect on Plant Diversity of Dehang Scenic Spot in Hunan Province, China
    XIANG Xiaomei, TAN Lu, LIU Bing, CHEN Gongxi
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  45-51. 
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    This paper reviewes the plant investigation, floristic study, relationship between plants and the special canyon eco-environment, and research status quo of of plant resources utilization of plant diversity in Dehang scenic spot. This review analyzes the unsolved scientific problems and looks forward to the future research. In the future, we should focus on the investigation of plant diveristy and the adaptive mechanisms of plants in particular canyon eco-environment, strengthen the management and construction of plant resources and the park, to achieve the protection of plant diversity and sustainable developlment of resources in Dehang scenic spot.
    Characteristic column:Study on Wuling Mountain Area
    Dynamic Evaluation of Poverty Alleviation Performance of Giant Salamander Industry in Zhangjiajie City
    TANG Yexi, ZHOU Shengfang, LI Zhihui
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  52-57. 
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    This paper selects 19 indicators from three aspects of economy, society and ecology, sets up an index system of poverty alleviation performance evaluation of giant salamander industry in Zhangjiajie City, and dynamically evaluates the poverty alleviation performance of giant salamander industry in the continuous poverty-stricken areas with  entropy weight TOPSIS method and obstacle factor analysis model. Taking Zhangjiajie City as an example, the  poverty alleviation performance of  giant salamander industry from 2012 to 2017 was analyzed. The results show that: (1) the poverty alleviation performance of Zhangjiajie giant salamander industry has improved year by year, showing an inverted U-shaped trend as a whole, and experienced poor performance (2012/20). 14), medium performance (2015), good performance (2016)and high-quality performance (2017); (2) the poverty alleviation performance in economic, social and ecological subsystems has been improved year by year, but the difference is large, with the economic performance being the most quickly improved, social performance the second, and the ecological performance  the slowest; (3) the comprehensive production government's investment and the  salamande sales are the main obstacle factors affecting the poverty alleviation performance of the salamander industry in Zhangjiajie City.
    Practice Mode of Rural Social Work Assisting Rural Revitalization
    ZHU Mingxia
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  58-63. 
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    Based on the analysis of the opportunity of rural revitalization through social work, and taking the  rural social work development in Wuling Mountain Area of Hunan Province as an example, this paper explores three practical modes of rural social work for rural revitalization in Wuling Mountain Area of Hunan Province: first, in terms of coordination, from sole service  to "layered coordination" of service and system; second, in terms of working paradigm, from the complementary social work  to developmental social work; third, in terms of working methods, from relying on professional working methods to combining professional methods with local experience.
    Analysis on the Regional Difference of Educational Poverty Alleviation Effect in Extremely Impoverished Areas:Case Study of 8 Counties (Cities) of Enshi Tujia and Miao Autonomous Prefecture
    WU Yongqing, JIANG Shuna, ZHANG Huaiying
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  64-69. 
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    Poverty is not only a reflection of the shortage of impoverished people's livelihood source, but also a consequence of the shortage of their ability and opportunities. Educational poverty alleviation aims at solving the problem of capacity shortage of poor people.At present, China's investment in educational poverty alleviation keeps increasing, but the benefits show significant regional differences. Taking Enshi Prefecture as an example, the study selects the data of 8 counties and cities, uses AHP and fuzzy comprehensive evaluation method to analyze the operation mechanism and poverty alleviation performance of education poverty alleviation of each county and city, and analyzes the regional difference of educational poverty alleviation with ArcGIS. Some suggestions are thus put forward.
    Medical Science
    Influence of Lower Limb Movement on Muscle Strength in COPD Patients with Invasive Mechanical Ventilation
    CHEN Shan, LI Yucui, ZHAO Chenggang, CHEN Siyu, DENG Lilin, ZHOU Lili, CHENG Peiyu
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  70-76. 
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    To compare the influences of exercise mode on COPD patietns with   invasive mechanical ventilation, 112 COPD patients who stayed in ICU conducted a group controlled experiment. According to the predetermined proposals, two groups of patients took different lower limb movement. The intervention group performed in-bed bicycle exercise, while the control group performed traditional in-bed exercise. The results indicated that there were significant differences subjective and objective indicators of lower limb, level of activation in ICU when patients left ICU as well as Barthel index scores when patients left ICU and discharged from hospital respectively between two groups (P<0.05). There were no significant differences in upper limb muscle strength measured either by electronic grip gauge or MRC scale between two groups (P>0.05). There was no significant difference in Barthel index score measured in the first six months after discharge (P>0.05). The results show that early in-bed bicycle exercise is secure and workable for COPD patietns with invasive mechanical ventilation, which can improve lower limb muscle strength and mobility and  promote recovery of activities of daily living.
    Economics
    Analysis of CiteSpace Knowledge Graph of Tourism Cooperation Research :Based on WOS Database
    LU Mingyong, LI Qing, QIN Qin, NIE Mengyi
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  77-85. 
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    Based on the 1 046 documents on tourism cooperation collected from Web of Sciences from 1999 to 2018, a knowledge graph of tourism cooperation research is drawn through the visualized software, CiteSpace5.1. It is found that five countries, including China, Spain, the United States, England, Germany and Australia, are the main sources of tourism cooperation research; in addition, England and Australia have higher central degree with more nodes and stronger influence; although Chinese academia has published the largest number of papers, the central degree is low and the influence is weak. "Model", "management", and "internet" are the three main topics of the research. From the perspective of author co-occurrence, BRAMWELL B, HALL C M, NOVELLI M, LEMMETYINEN A, BERITELLI P have made great contribution to tourism cooperation research. Other coocurring disciplines include sociology, environmental science and ecology, business and economics, and management.
    Analysis and Prediction of Opening Price of Bank Stocks Based on ARMA Model
    CHEN Hao, LAN Yanhong, HE Yubo
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  86-91. 
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    Taking the time series of the opening price of each stock trading day from January 2, 2018 to December 26, 2019 of China Construction Bank as the research object, the original series is stabilized by difference method, and then the ARIMA model satisfied by the original series is determined by AIC and HQ minimum criteria. The model is used to predict the short-term opening price of China Construction Bank, and the results show that the predicted value is in good agreement with the actual value, and the short-term error is small.
    Big Data Technology and Targeted Poverty Alleviation in Post-Poverty-Alleviation Era
    YANG Yong, FU Qiang
    Journal of Jishou University(Natural Sciences Edition), 2020, 41(5):  92-96. 
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    To achieve comprehensive and targeted poverty alleviation in ethnic minority area, the article analyzes the association points between big data technology and targeted poverty alleviation. It explores the technological advantages of big data for targeted poverty reduction and then puts forward efficient paths to achieve intelligent poverty alleviation, such as how to construct rural big data infrastructure, to cultivate big data technical team, to work on poverty governance by big data, which would provide guidance for comprehensive and targeted poverty alleviation in the ethnic minority areas.
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