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Uniform Blow-up and Estimation of Boundary-Layer for Nonlocal Parabolic Equations LIN Zhiqiang Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 1-9.   DOI: 10.13438/j.cnki.jdzk.2021.01.001 Abstract （1085）      PDF （112）       Knowledge map    Save We consider the properties of solutions of reaction-diffusion system ut－Δu=∫Ωuα1dx∫Ωvβ1dx,vt－Δv=∫Ωuα2dx∫Ωvβ2dx, and obtain the uniform blow-up profiles of solutions, and the estimates of boundary layer. Reference | Metrics

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Error Bounds for Linear Complementarity Problem of B-Matrices DONG Yingxue, MO Hongmin Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 16-22.   DOI: 10.13438/j.cnki.jdzk.2021.01.003 Abstract （899）      PDF （67）       Knowledge map    Save With the infinite norm range of the inverse matrices of the strictly diagonally dominant M-matrices, the error bounds for linear complementarity problem of B-matrices is studied, and a new estimate of the error bounds is given. Reference | Metrics

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Research Review of Recurrent Neural Networks WANG Yuyan, LIAO Bolin, PENG Chen, LI Jun, YIN Yumin Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 41-48.   DOI: 10.13438/j.cnki.jdzk.2021.01.007 Abstract （883）      PDF （163）       Knowledge map    Save Recurrent neural network (RNN) is a kind of neural network with feedback connection in each layer. Because of its storage characteristics, it can process the sequence data which is related before and after input, and can be widely used in the field of text audio, video and so on. But when the input gap is large, RNN has a short-term memory problem, which can not process long input sequences, while long short-term memory (LSTM) can deal with the long-term dependence problem well. Almost all the exciting results based on RNNs have been realized by LSTM since LSTM was proposed, so LSTM has become the focus of deep learning. This review firstly introduces the basic working principle and characteristics of RNN, and then it introduces the principle and characteristics of LSTM and its variants, as well as  the application of RNN and LSTM in various fields. Finally, the future research direction of RNN is proposed. Reference | Metrics

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Stable Total Duality for DC Composite Optimization Problems YANG Ting, XIE Feifei, FANG Donghui Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 23-28.   DOI: 10.13438/j.cnki.jdzk.2021.01.004 Abstract （879）      PDF （103）       Knowledge map    Save By using subdifferential properties, we introduce two new constraint qualifications, and establish some necessary or sufficient conditions for the total duality and the stable total duality between DC composite optimization problem and its dual problem. Reference | Metrics

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Mordukhovich Subdifferentials of the Value Function for Parametrized Composite DC Optimization Problems XIAO Chengfeng, FANG Donghui Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 29-34.   DOI: 10.13438/j.cnki.jdzk.2021.01.005 Abstract （863）      PDF （108）       Knowledge map    Save By using the properties of subdifferentials of function, we introduce a new weaker constraint qualification. Under this constraint qualification, we establish the upper estimates of the Mordukhovich subdifferential of the value function for the parametrized DC composite optimization problems. Then, applications to the conic programming involving DC composite function are given. Reference | Metrics

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A Set of Criteria for Nonsingular H-Matrices WEI Yingying, LUO Biao, MO Hongmin Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 10-15.   DOI: 10.13438/j.cnki.jdzk.2021.01.002 Abstract （766）      PDF （91）       Knowledge map    Save A set of criteria for nonsingular H-matrices are given according to the relationship between α-chain diagonally dominant matrix and nonsingular H-matrix. Their effectiveness is illustrated by numerical examples. Reference | Metrics

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Solving TSP Issue Based on  Improved Harmony Algorithm WU Ying, OU Yun, YAO Xuanshi, DING Lei Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 35-40.   DOI: 10.13438/j.cnki.jdzk.2021.01.006 Abstract （716）      PDF （216）       Knowledge map    Save To improve the convergence speed and accuracy of harmony search (HS) algorithm, a dynamic harmony search algorithm (DHSA) by dynamic adjustment probability mechanism is presented in this paper to settle traveling salesman problem (TSP). In simulation, three classic algorithms, which are genetic algorithm (GA), Harmony Search Algorithm (HSA), and DHSA are selected to verify the feasibility by implementing two TSP data-sets bayg29 and ch150, respectively. The results reveal that the DHSA could obtain the shortest path among these algorithms. Reference | Metrics

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Performance Analysis of Fifth Order IIR Digital Low-Pass Filter ZHOU Xuan, WU Yunwen Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 49-53.   DOI: 10.13438/j.cnki.jdzk.2021.01.008 Abstract （636）      PDF （135）       Knowledge map    Save MATLAB software platform is used to study the performance of the fifth order IIR digital low-pass filter designed by bilinear transformation method. The relationship between the order of digital filter and the maximum attenuation of passband, the minimum attenuation of stopband, the corner frequency of passband boundary and the corner frequency of stopband boundary is derived. At the same time, the transition band and stop band of the filter are further analyzed by combining the system function, z-domain analysis and simulation results. Analysis indicates that: the fifth order IIR digital low-pass filter is a stable system, the phase presents delay in the passband and stopband. When the frequency is 0.25π rad/s, the phase state has reverse mutation, and the transmitted signal envelope collapses and enters the transition band. At this time, the phase presents a leading state. When the amplitude response in the stopband decays to 0, the system signal still has phase change, and  there is still signal in this frequency band. Reference | Metrics

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SWOT Analysis of Building Zhangjiajie into a Developed Cybereconomic Place DENG Yulu Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 78-82.   DOI: 10.13438/j.cnki.jdzk.2021.01.012 Abstract （451）      PDF （325）       Knowledge map    Save Using the SWOT model, this paper analyzes the advantages, disadvantages, opportunities, and threats of building Zhangjiajie into a developed cybereconomic place. It is found that the advantages of Zhangjiajie include abundant local resources, mature online marketing, and robust  policy support. Insurfficient economic development,inadequate functions of the transportation hub  are also the threats which Zhangjiajie are facing. The recovery of the tourism market, the development of online economy, and the improvement of transportation and logistics system  are the opportunities. The complicated operation and supervision of online economy, the short period of online  effects, the lack of online operation talents, and fierce competition in surrounding areas are threats. In order to further cultivate and develop cyber economy, the city of Zhangjiajie must exploit the potential of  products for online marketing and activate the online marketing efficiency; strengthen the reservior of talents and enhance competitiveness; build a sophisticated regulatory mechanism to avoid regulatory absence; strengthen maintenance system, and consolidate the foundation for development. Reference | Metrics

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Influence of the Middle Wall on the Mechanical Characteristics of Frame Bridges WANG Jianxing, LI Zhuoyu, SUN Xueqian, SHI Qingyun Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 54-60.   DOI: 10.13438/j.cnki.jdzk.2021.01.009 Abstract （396）      PDF （132）       Knowledge map    Save This paper takes an actual  frame bridge as the engineering background, establishes a model of the bridge under design load, and analyzes the influence of the middle wall on the mechanical characteristics of the frame bridge. Comparative research shows that the extreme values of the top and bottom plates of the frame bridges decrease in vertical displacement, vertical axial force, shear stress; the extreme values of the curvature change and cross-sectional stress of the top plates decrease,  while those of the bottom places increase. The research also shows that the vertical displacement of the top plates is most obviously affected by the middle wall and the shear stress of the bottom plates is lest affected by the middle wall. Reference | Metrics

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Advances in diagnosis and treatment of uterine scar pregnancy after cesarean section HUANG Liying, ZHANG Yuhua, LIN Tong Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 90-96.   DOI: 10.13438/j.cnki.jdzk.2021.01.014 Abstract （388）      PDF （134）       Knowledge map    Save Study Objective:This article reviews the clinical manifestations and diagnosis and treatment of uterine scar pregnancy after cesarean section in recent years at home and abroad, with a view to providing a reference for gynecologists in the diagnosis and treatment of uterine scar pregnancy after cesarean section.Measurement: Search CNKI, Wanfang, Pubmed and other databases, and use literature tracing and other methods to collect publicly published relevant research on uterine scar pregnancy after cesarean section.Results: The main diagnostic methods are: ultrasound examination, MRI, hysteroscopy, laparoscopy, and histopathological examination are still the gold standard for the diagnosis of CSP. There are many ways to treat CSP. At present, level I evidence has not been proposed, so that there is no specific evidence-based guideline. The current treatment methods are: drug treatment, uterine artery embolization, surgical treatment or multiple treatments. Clinical treatment of CSP patients should clearly identify the type of disease and the advantages and disadvantages of various surgical procedures, combined with comprehensive analysis of the patient's condition, fertility requirements, economic conditions, hospital facilities and other indicators, and select a reasonable surgical method to minimize patient treatment. Risk, obtain a good prognosis and preserve fertility.Conclusion: For the early diagnosis of CSP method has been clear, but the best treatment plan and management guidelines at present has not yet reached a consensus that the uterus after cesarean section scar pregnancy diagnosis and treatment, there is no uniform standard, the most ideal treatment need large sample randomized controlled studies data. Reference | Metrics

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Investigation and Exploitation of Edible Medicinal Plant Resources in Xiangxi region, China CHEN Jiabei, WANG Lu, LIU Jinyuan, DENG Shanshan, HU Die, CHEN Gongxi Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 66-77.   DOI: 10.13438/j.cnki.jdzk.2021.01.011 Abstract （370）      PDF （151）       Knowledge map    Save In order to understand the current situation of medicinal and edible wild plants resources and development and utilization in Xiangxi region. By means of field investigation and literature review, the family composition, living habits, habitat and distribution pattern, function and utilization of medicinal and edible plants in this area were investigated and analyzed. The results showed that there were 57species of medicinal and edible wild plants belonging to 30 families and 52 genera in Xiangxi region. Among them, Liliaceae, Compositae, Gramineae, Lamiaceae and Rosaceae were the dominant quantitative families, Polygonatum, Lilium, Amygdalus and Ziziphus were the dominant quantitative genera. There are 35 herbaceous plants and 23 woody plants, and herbaceous plants are dominant. Among 21 habitats, hillside, cultivated land, forest and roadside are important habitats for medicinal and edible plants in Xiangxi region. In the distribution pattern, the horizontal distribution pattern of the southern and northern regions is basically uniform. The vertical distribution was significantly different, and the medicinal and edible plants were most distributed in the low mountain area. In terms of function and utilization, there are many functions, parts and methods of medicinal and edible plants. Among them, plants with heat-clearing medicinal and edible health care effect are the most. Plants with edible and medicinal stems accounted for the highest proportion. Most plants are decocted for medicine and cooked in soup/porridge. Xiangxi region is rich in medicinal and edible plant resources and has great potential. The protection, comprehensive research, development and utilization of local medicinal and edible plants should be carried out, and corresponding measures should be taken to promote the development of medicinal and edible plant resources in Xiangxi region. Reference | Metrics

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Research Progress in the Relationship Between Intestinal Flora and Its Metabolites and Psycho-Cardiology XUE Bingqing, LI Chunyan, ZHU Can Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 83-89.   DOI: 10.13438/j.cnki.jdzk.2021.01.013 Abstract （347）      PDF （130）       Knowledge map    Save Psycho-cardiology refers to cardiovascular disease with mental illness which is attracted growing attention with medical development. In the previous treatment of cardiovascular disease, doctors focused more on organic cardiopathy than on psychological disease of patients. Numerous studies have shown that intestinal flora and its metabolites played a vital role not only in cardiovascular disease, but also in mental and psychological diseases. This article summarizes the influences and mechanism of intestinal flora and its metabolites in the outbreak and development of psycho-cardiology, as well as the potential value in the prevention and treatment of psycho-cardiology to offer new insights into the prevention and treatment of ppsycho-cardiology. Reference | Metrics

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Practice Mode of Rural Social Work Assisting Rural Revitalization ZHU Mingxia Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 58-63.   DOI: 10.13438/j.cnki.jdzk.2020.05.012 Abstract （263）      PDF （125）       Knowledge map    Save 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. Reference | Metrics

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Number of 1-Factors in Three Types of 3-Regular Graph TANG Baoxiang, REN Han Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 1-4.   DOI: 10.13438/j.cnki.jdzk.2020.06.001 Abstract （258）      PDF （203）       Knowledge map    Save Three types of 3-regular graphs are constructed, and the calculation formulas for the number of 1-factors of these three types of graphs are given by the method of classification and summation. Reference | Metrics

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Active Earth Pressure Calculation of Retaining Wall with Hoek-Brown Criterion SUN Wangcheng, ZHANG Daobing, JIANG Jin, YU Biao, YIN Huadong Journal of Jishou University(Natural Sciences Edition)    2021, 42 (1): 61-65.   DOI: 10.13438/j.cnki.jdzk.2021.01.010 Abstract （163）      PDF （127）       Knowledge map    Save Based on the logarithmic spiral failure mechanism of the retaining wall and  the nonlinear Hoek-Brown strength criterion, the earth gravity power, internal energy dissipation rate and active earth pressure power of the retaining wall are calculated by the upper limit analysis method. The analytic formula of active earth pressure of the retaining wall is derived based on the virtual power principle, and the optimal upper limit solution of the active earth pressure is solved by Matlab software. The influence of Hoek-Brown strength criterion, retaining wall and soil parameters on the active earth pressure and stability of the retaining wall are analyzed. The results show that with the increase of disturbance factor, wall back angle, retaining wall height, and soil bulk density, the active earth pressure increases nonlinearly, and the stability of the retaining wall decreases. As the geological strength index, rock mass constant, external friction angle, and uniaxial compressive strength increase, the active earth pressure nonlinearly decreases, and the stability of the retaining wall increases. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.016 Abstract （160）      PDF （102）       Knowledge map    Save 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. Reference | Metrics

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An Watermarking Algorithm Against Cropping Attack Based on SVD and DCT YU Shuaizhen, ZHOU Jian, XIE Daoping Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 21-27.   DOI: 10.13438/j.cnki.jdzk.2020.06.005 Abstract （147）      PDF （38）       Knowledge map    Save In order to improve the anti-attack capability  of watermarking system against cropping attack, this paper presents an anti-cropping watermarking algorithm based on multi-transform domain. The DCT transform is carried out on each segmentation region of the host image and the maximum coefficients of each segmentation region are extracted to form a new matrix. The encrypted watermark information is then embedded into the singular value transformation domain of this matrix. Experiments show that the algorithm can not only fully resist the single cropping attack, it also has  strong resistance to the joint attack of conventional image processing and local cropping. Even after multiple joint geometric attacks, it can still extract clear watermarks. Reference | Metrics

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Online Examination and Practice System for Java Programming CHEN Min, TANG Huiyi Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 14-18.   DOI: 10.13438/j.cnki.jdzk.2020.05.004 Abstract （129）      PDF （79）       Knowledge map    Save 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. Reference | Metrics

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Transient Dynamic Response of Frame Bridge to Train at Different Speeds WANG Jianxing, Minabai·Maimaitituerxun, HUANG Yilong Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 51-55.   DOI: 10.13438/j.cnki.jdzk.2020.06.010 Abstract （120）      PDF （26）       Knowledge map    Save With an ordinary concrete frame bridge project as the research object, a numerical model of concrete frame bridge was established with the solid element Solid65 in the finite element analysis software. The deflection-time curve of the mid-span joints of the frame bridge was obtained through transient dynamic calculation and analysis of the complete method, which  reflected the dynamic response characteristics, the displacement characteristics of the frame bridge when the train  passed through the frame bridge at different speeds. The analysis results  showed that 120~150 km/h was the optimal speed interval for the train to  pass through the frame bridge. At this speed interval, the dynamic deflection time-history curve of the frame bridge  tended to be flat, and the maximum deformation of the bridge body  was 1.88×10-2mm which  occurred near the mid-span  before and after the train  passed through the mid-span. Reference | Metrics

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Solution of Isochronous Curve Problem XING Jiasheng, WU Sang Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 5-10.   DOI: 10.13438/j.cnki.jdzk.2020.06.002 Abstract （106）      PDF （80）       Knowledge map    Save For the solution of isochronal curves with a given isochronal time function and the formula of time for particle to slide down from a certain height along the smooth curve, the problem is transformed into an integral equation solution problem and  Abel transformation is performed for the integral equation. Integral order conversion method is applied to obtian the solution formula, and the solution of the isochronous descent problem is proved out an inverted cycloid. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.006 Abstract （104）      PDF （52）       Knowledge map    Save 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. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.001 Abstract （101）      PDF （126）       Knowledge map    Save 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. Reference | Metrics

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Characteristics  of Tourism Economic Difference and Influencing Factors in Hunan Province TANG Yexi, LI Zhihui, ZHOU Shengfang, ZUO Xin, DENG Mingrong Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 91-96.   DOI: 10.13438/j.cnki.jdzk.2020.06.016 Abstract （97）      PDF （33）       Knowledge map    Save Taking 14 prefecture-level cities (prefectures) in Hunan Province as the research objects, using SPSS software to calculate the standard deviation, coefficient of variation, Gini coefficient and nich index, the characteristics and influencing factors of the difference in tourism economy in Hunan Province from 2009 to 2018 are analyzed.The results show that the difference in tourism economy of various cities (prefectures) in Hunan Province is gradually shrinking; the pattern of convergence and dispersion of the inbound tourism economy is more significant; the level of socio-economic development and tourism resources are the main factors affecting the difference in tourism economy. Reference | Metrics

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Prediction of Cultivated Land Quantity in Yongding District, Zhangjiajie CHEN Ming, XIE Huan, PENG Xinzhu, ZHOU Yajin, TAN Yunxian, ZHUANG Dachun Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 70-73.   DOI: 10.13438/j.cnki.jdzk.2020.06.013 Abstract （85）      PDF （33）       Knowledge map    Save Taking Yongding District, Zhangjiajie as an example, based on the analysis of the current characteristics of  cultivated land utilization and the dynamic changes, the paper defines  three objectives of reserving  cultivated land, namely food security, economic security and ecological security. Using the methods of food security method, supply-demand balance and trend extrapolation method to predict the prospective cultivated land quantity under the single target restriction in 2020,2030 and 2035, the Analytic Hierarchy Process (AHP) is used to assign the weights of the prediction results, and a multi-objective combined model is established. The total cultivated land tenure in Yongding District in 2020,2030 and 2035 is 30 423.35，29 515.76，29 321.66 8hm respectively. This indicates that the overall trend of reduction of cultivated land  is decreasing. Reference | Metrics

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Simulation of IC Bus Technology Based on Proteus XIANG Jiwen Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 32-36.   DOI: 10.13438/j.cnki.jdzk.2020.06.007 Abstract （83）      PDF （20）       Knowledge map    Save The hardware connection and data transmission protocol of IC bus are studied, and a simulation circuit with three IC memories is designed. The main controller adopts single chip microcomputer and the control program is written in assembly language. Proteus  simulation test shows that the result is correct. Reference | Metrics

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Determination of the Threshold Temperature of Physical and Mechanical Properties of Sandstone Post High Temperature by Machine Learning Algorithm LONG Qinyuan, MEI Gang, TIAN Hong, XU Nengxiong Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 45-50.   DOI: 10.13438/j.cnki.jdzk.2020.06.009 Abstract （81）      PDF （39）       Knowledge map    Save In this paper, machine learning algorithm is adopted to determine the threshold temperature of physical and mechanical properties changes of sandstone post high temperature. Based on Python language, SVM and K-means algorithm are employed to classify and cluster sample data, determine the threshold temperature range, and verify the rationality and accuracy of dichotomies. The results show that 1) the threshold temperature range of the sandstone sample is 400 ℃ ~ 600 ℃; 2) there are significant differences on the physical and mechanical properties of the sandstone around the threshold temperature. The physical and mechanical properties of the rock samples are relatively scattered below the threshold temperature range, while the physical and mechanical properties of the rock samples are relatively concentrated above the threshold temperature range. Reference | Metrics

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Problems and Innovative Development Path of Wuhan Marathon LI Li Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 74-79.   DOI: 10.13438/j.cnki.jdzk.2020.06.014 Abstract （80）      PDF （32）       Knowledge map    Save This paper studies the problems of Wuhan marathon. The results show that the number of participants in Wuhan marathon needs to be expanded, the event items and activities content are relatively single; the air quality needs to be further improved; the financing channel of the event is single; and the derivatives of the event are not rich. On the basis of these, the paper puts forward some suggestions, such as strengthening the supply side reform of the event, enriching the event and activity content, strengthening the management and monitoring of air quality, strengthening the commercial awareness, broadening the source of competition funds, and building a complete industrial system of events. Reference | Metrics

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Control Strategy of Induction Wind Power Generator System with Full Rated Inverter PAN Liqiang, LI Juan, YANG Gaocai, YU Hu, HOU Yiling, XU Binkun Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 37-44.   DOI: 10.13438/j.cnki.jdzk.2020.06.008 Abstract （78）      PDF （42）       Knowledge map    Save For smooth operation of the power system regardless of the various wind speed and system ground faults, the full rated inverter is applied in wind generator. This inverter has double loop control on both grid side and generator side. It is note that the voltage closed-loop control as an innovative use is attributed for grid side control. The pitch angle controller is designed to meet both various wind and system faults according to the input signal. Simulations for evaluated the performance are conducted and the results verify that the proposed control strategy with the high efficiency satisfies requirements both WT control and the quality of the power grid. Reference | Metrics

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A Review of Chinese Agricultural Product Brand Based on Mapping Knowledge Domains SHI Xiaochun, WEN Hao, WANG Jingjing, CHEN Chen Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 80-90.   DOI: 10.13438/j.cnki.jdzk.2020.06.015 Abstract （76）      PDF （58）       Knowledge map    Save Based on the relevant theories of mapping knowledge domain, the literature concerning Chinese agricultural product brands realized visible analysis by CiteSpace software and the hot element, evolution process and trend of agricultural product brands research were analyzied by Netdraw software which described The results illustrated that the focuses were brands attribute structure and effectiveness, brand evaluation, brand constructin. The evolution path of the research content reflects the characteristics of different stages, which conforms to the adjustment of national policies and changes of economic and social development. There are few scholars and institutions specializing in agricultural products bands research. The close cooperation was not set up among these scholars and institutes. Future research should further improve the basic theory and research method of agricultural products brand, expand the depth and breadth of agricultural products brand research, and establish a close academic research network. Reference | Metrics

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Hyperbranched Polytriazole Solid Polyelectrolyte and Its Li-Ion and Zinc-Ion Conductivity OU Xiaoying, LIU Ben, WU Jianhua, PENG Xiaochun Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 61-69.   DOI: 10.13438/j.cnki.jdzk.2020.06.012 Abstract （76）      PDF （61）       Knowledge map    Save Hyperbranched polymer with rigid structure usually have good solubility, low viscosity and outstanding mechanical properties, which could be used to prepare solid electrolyte. Hyperbranched polytriazole (hb-GPTA) was synthesized due to azide-acetylene click chemistry reaction of alkynyl-based monomer M1 and azido-contained monomer M2 with catalysis by Cu(I). The hb-GPTA exhibited good solubility, film formation property, and thermostability (the thermal decomposition temperature is 35 ℃). The hb-GPTA was doped with LiTFSI and Zn(OTf)2 respectively to prepare solid electrolytes whose electrochemical properties were characterized. The results demonstrated that LiTFSI doped polymer had higher conductivity of 3.27×10-5 S/cm and the electrochemical window is 5.2 V, while the Zn(OTf)2 doped polymer exhibited lower conductivity of 4.20×10-7 S/cm but remained stable within the voltage range of -1~ 6V. It could be inferred that polymer with triazole has potential application value in making zinc batteries together with electrochemical stability analysis. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.005 Abstract （76）      PDF （53）       Knowledge map    Save 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. Reference | Metrics

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A New Discrete TV p Model PENG Ying, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2020, 41 (5): 41-44.   DOI: 10.13438/j.cnki.jdzk.2020.05.009 Abstract （75）      PDF （56）       Knowledge map    Save The adaptive TV p 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 TV p 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 TV pmodel, and the image recovered has better quality and higher signal-to-noise ratio than the TV p model. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.010 Abstract （73）      PDF （34）       Knowledge map    Save 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. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.003 Abstract （71）      PDF （25）       Knowledge map    Save 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]）. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.017 Abstract （71）      PDF （29）       Knowledge map    Save 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. Reference | Metrics

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On a Strengthened Half-Discrete Hilbert-Type Inequality Related to the Riemann Zeta Function NIE Caiyun Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 11-14.   DOI: 10.13438/j.cnki.jdzk.2020.06.003 Abstract （69）      PDF （33）       Knowledge map    Save With weight function, Hermite-Hadamard’s inequality, and a strengthened Hlder inequality, a half-discrete Hilbert-type inequality in the whole plane with the kernel of hyperbolic cotangent function and multi-parameters is improved. Some new inequalities are built. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.015 Abstract （68）      PDF （59）       Knowledge map    Save 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. Reference | Metrics

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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.   DOI: 10.13438/j.cnki.jdzk.2020.05.013 Abstract （66）      PDF （31）       Knowledge map    Save 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. Reference | Metrics

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Time Series Transformation Algorithms Based on Complex Networks HE Maoyu, ZHOU Yin, ZHOU Jingxi, SHEN Li Journal of Jishou University(Natural Sciences Edition)    2020, 41 (6): 28-31.   DOI: 10.13438/j.cnki.jdzk.2020.06.006 Abstract （63）      PDF （62）       Knowledge map    Save To improve classic visibility algorithm of transformation from time series to complex networks, this paper proposes maximum value split algorithm and convex hull algorithm and applies them in the fractal Brown time series respectively. Experimental results show that improved algorithm can reduce time complexity remarkably. Reference | Metrics