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Proof That  n-Dimensional Normally Distributed Linear Functions Obey Normal Distribution XING Jiasheng, YANG Yichuan, WU Sang Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 1-5.   DOI: 10.13438/j.cnki.jdzk.2021.03.001 Abstract （1888）      PDF（pc） （322KB）（2085）       Knowledge map    Save A method is given to prove that the n-dimensional normally distributed linear functions obey normal distribution. First,  the n-dimensional normally distributed linear function is expressed as the linear function of the n-dimensional standard normal distribution by the transitivity of linear transformation. Then, the linear function of n-dimensional normal distribution is proved to obey normal distribution by using the property that the linear functions of mutually independent normal distribution obey normal distribution. Reference | Related Articles | Metrics | Comments（0）

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Proof Converges with Probability That the k-th Order Central Absolute Moment of the Sample XING Jiasheng, YANG Yichuan, WU Sang Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 4-8.   DOI: 10.13438/j.cnki.jdzk.2021.04.002 Abstract （1634）      PDF（pc） （290KB）（1160）       Knowledge map    Save Considering the problem of convergence in probability of the k-th order center absolute moment of the sample, using Khinchin’s law of large numbers and the property of convergence in probability of random variable sequences, through inequality scaling techniques, the concrete proof is given that the k-th order central absolute moment of the sample converges with probability to the k-th order central absolute moment of the population. Reference | Related Articles | Metrics | Comments（0）

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Design  of Surface Garbage Cleaning Robot JIANG Xiaoyu, CHEN Jialiang, ZHOU Haolan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 41-44.   DOI: 10.13438/j.cnki.jdzk.2021.03.007 Abstract （3309）      PDF（pc） （2097KB）（934）       Knowledge map    Save At present, the pollution of the waters is very serious and is of great concern to the general public. In particular, inland lakes, such as: campuses, community viewing lakes, scenic areas to play with the lake, the prevalence of water garbage difficult to clean up and safety issues. Now the treatment of these surface garbage is basically to take artificial salvage mode, this treatment has great safety risks, and time-and-effort, so the surface garbage cleaning robot came into being. Based on the ardoino uno board as the main control core, this design uses Bluetooth module connection control, including control devices, power units, collection devices and storage devices. The use of conveyor belt to collect garbage instead of the traditional salvage mode, with fast salvage speed, low labor intensity, high efficiency characteristics, and low cost, small size, high efficiency, has a strong practicality. Reference | Related Articles | Metrics | Comments（0）

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Analysis of Consumer Satisfaction of Domestic Brand Sports Goods：Take Li Ning sports goods as an Example YUAN Han Journal of Jishou University(Natural Sciences Edition)    2021, 42 (5): 70-74.   DOI: 10.13438/j.cnki.jdzk.2021.05.013 Abstract （1333）      PDF（pc） （396KB）（540）       Knowledge map    Save The article aims to explore the relationship between the product characteristics, service quality, brand image and consumer satisfaction of domestic brand sports products. Taking the domestic brand Li Ning sports goods as an example, through questionnaire surveys, the collected data are collected and the samples are analyzed and verified by statistical methods. The study found that: the demographic variables are different in product characteristics, service quality, brand image and consumer satisfaction, and there is no difference between age and product characteristics, service quality, brand image and consumer satisfaction. There are obvious differences between groups; among the various variables of golf age for product characteristics, service quality, brand image and consumer satisfaction, there is a difference between golf age and brand image between 1~5 years and 6~10 years. Obvious inter-group differences; there is no obvious inter-group difference among the variables of monthly income for product characteristics, service quality, brand image and consumer satisfaction. The relationship between product characteristics, service quality, brand image and consumer satisfaction is observed by Pearson's correlation coefficient value. It is found that product characteristics, service quality, and brand image have a significant positive impact on consumer satisfaction. And put forward relevant suggestions, hoping to provide theoretical reference for other domestic brands. Reference | Related Articles | Metrics | Comments（0）

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Theoretical Derivation of the Kramers-Kronig Relationship Based on the Fourier Transform SU Hongmei Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 48-51.   DOI: 10.13438/j.cnki.jdzk.2022.03.008 Abstract （647）      PDF（pc） （323KB）（441）       Knowledge map    Save From the causal law of physical experimental facts,without concrete microscopic physical model, this paper discusses the physical mechanism and theoretical derivation of the Kramers-Kronig relationship based on Fourier transform,dispersion theory,and residue theorem. Reference | Related Articles | Metrics | Comments（0）

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Review of Hybrid Beamforming Technology for Millimeter Wave Massive MIMO System LIU Jian, QIAN Yingjing, ZHANG Renmin Journal of Jishou University(Natural Sciences Edition)    2022, 43 (1): 43-52.   DOI: 10.13438/j.cnki.jdzk.2022.01.008 Abstract （842）      PDF（pc） （705KB）（440）       Knowledge map    Save In view of hybrid beamforming techniques for mmWave communications,we first describe the transmission characteristics of the mmWave  and its channel model,and outline the architecture of a massive mmWave MIMO hybrid beamforming system and its mathematical model.On that basis,we summarize  the transmission scheme and introduce two feasible methods of mmWave beam alignment.Finally,the typical applications  of mmWave communication integrated with other technologies and the future research hotspots  are anticipated. Reference | Related Articles | Metrics | Comments（0）

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Study on Sound Insulation of Second Order Helmholtz Resonator ZHAO Zhun, KONG Peng, DENG Ke Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 27-30.   DOI: 10.13438/j.cnki.jdzk.2021.04.006 Abstract （696）      PDF（pc） （1378KB）（439）       Knowledge map    Save Based on the sound insulation characteristics of the traditional Helmholtz resonator, the equivalent impedance of the Helmholtz resonator based on second-order resonance is derived by using the transfer matrix method layering, and the sound insulation characteristics of the second-order Helmholtz resonator are studied in combination with finite element simulation. It is verified that there are two sound insulation bands in the second-order resonator, and excellent sound insulation effect can be obtained by adjusting the geometric parameters. It has some research significance in acoustic application of sound noise reduction. Reference | Related Articles | Metrics | Comments（0）

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Design of Real-Time Plant Growing Environment Monitoring System Based on Mobilephone App LI Deying, QIU Yangfan, YI Tao, XIAO Yiyang Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 21-28.   DOI: 10.13438/j.cnki.jdzk.2021.03.004 Abstract （972）      PDF（pc） （5161KB）（426）       Knowledge map    Save In view of the difficulty in monitoring the temperature and humidity of plant growth environment, a remote real-time monitoring system for air temperature and humidity and soil humidity is designed. The system uses stm32f103c8t6 microcontroller as the microprocessor, collects air temperature and humidity and soil humidity through temperature and humidity sensor, and then uploads the collected data to the mobile phone through Wi-Fi module, and transmits the data to the cloud server through the mobile phone App, so as to realize the remote real-time monitoring of environmental temperature and humidity. The simulation results show that the monitoring system has strong real-time performance and high intelligence, which meets the requirements of temperature and humidity control of plant growth environment in agricultural production. Reference | Related Articles | Metrics | Comments（0）

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Vehicle Re-Identification Based on Multi-Scale and Wavelet Spatial Attention LIAO Guangkai, ZHANG Zheng, NIU Yibo, SONG Zhiguo Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 15-22.   DOI: 10.13438/j.cnki.jdzk.2021.06.003 Abstract （634）      PDF（pc） （5379KB）（426）       Knowledge map    Save For the problem that the multi-scale vehicle re-identification model is short of extracted detail features, a re-identification model combining multi-scale vehicle features and wavelet attention mechanism is designed.  Firstly, spatial wavelet attention module is embedded into the model to obtain more details for the network. Secondly, a hierarchical fusion network is proposed, which integrates the features of different scales to improve the ability of global feature aggregation. Finally, TriHard and CrossEntropy Loss functions are used to construct the object function of vehicle identification. Experimental results of this model compared with other excellent models on VeRi and VehicleID datasets show that vehicle re-identification accuracy can be improved by embedding spatial wavelet attention into multi-scale networks. Reference | Related Articles | Metrics | Comments（0）

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Image Encryption Algorithm Based on 5D Hyperchaotic System WU Chaoyang, ZHOU Ying Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 4-14.   DOI: 10.13438/j.cnki.jdzk.2021.06.002 Abstract （660）      PDF（pc） （13483KB）（367）       Knowledge map    Save A novel image encryption method is put forward based on 5D hyperchaotic system. At first, initial values of 5D hyperchaotic system are calculated based on secret keys and chaotic sequences are generated. Then chaotic sequences are preprocessed to get new chaotic sequences. Two-dimensional permutation  is executed to plain image based on column and row sorting. The cycle shift is also employed to improve the security of the scheme. Diffusing operation is performed at last and encrypted image is obtained. Experimental results and theoretical analysis prove that the method possesses a large key space and could resist kinds of attacks. Reference | Related Articles | Metrics | Comments（0）

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An Improved Whale Optimization Algorithm Based on Levy Flight and Brownian Motion YU Cunwei, MO Liping, WAN Runze Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 24-32.   DOI: 10.13438/j.cnki.jdzk.2023.02.004 Abstract （666）      PDF（pc） （1094KB）（344）       Knowledge map    Save A whale optimization algorithm based on Levy flight and Brownian motion is designed to overcome the disadvantages of whale optimization algorithm such as low accuracy,slow convergence and easiness to fall into local optimum.First,Levy flight method is used to initialize the whale population to increase the diversity of the initial population.Then,according to the principle of Brownian motion,the position update of the whale population is randomly perturbed to avoid the algorithm falling into local optimization in advance.The improved whale optimization algorithm is compared with whale optimization algorithm,particle swarm optimization algorithm,genetic algorithm and ant colony optimization algorithm on seven different benchmark test functions.The experimental results show that the improved whale optimization algorithm is superior to the other four algorithms in terms of solution accuracy and convergence speed.At the same time,simulation and comparison experiments are carried out on the initial solution exploration range of the improved whale optimization algorithm using Levy flight strategy and the whale optimization algorithm using random search strategy in the initialization stage.The experimental results show that the improved whale optimization algorithm can avoid falling into local optimization in a certain program. Reference | Related Articles | Metrics | Comments（0）

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Preparation of Li3V2(PO4)3/C Composite Material Using Acetylene Black as Carbon Source LIU Saiqiu, JIANG Youliang, ZOU Qiuling, MA Boran, XIANG Yanhong, WU Jianghua, XIONG Lizhi, WU Xianwen Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 73-78.   DOI: 10.13438/j.cnki.jdzk.2021.03.013 Abstract （889）      PDF（pc） （6044KB）（325）       Knowledge map    Save In this paper, Li3V2(PO4)3/C material is successfully prepared by the simple sol-gel method and treated by further calcining. The effect of carbon coating on the morphology, structure and electrochemical performance of the material is comprehensively investigated. It's demonstrated that the monoclinic structure (P21/n) of Li3V2(PO4)3/C retains complete after carbon coating. The sample with 7 nm coating layer presents excellent crystallinity, which coated by 2 times contents （C20-LVP） of carbon. The electrochemical performance has been improved a lot, with its discharge capacity increasing to 120.3 mAh/g compared with 103.6mAh/g of the sample without carbon coating（C00-LVP）. In addition, a good retention rate of 91% can be obtained, since the discharge ratio can achieve 104.5 mAh/g the after 60 cycles. Reference | Related Articles | Metrics | Comments（0）

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Accurate Demand Analysis and Prediction for New Retail Target Products LANG Hong, CHANG Xiao, LI Qin, SONG Guofeng Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 87-91.   DOI: 10.13438/j.cnki.jdzk.2021.03.015 Abstract （994）      PDF（pc） （365KB）（322）       Knowledge map    Save Firstly, the factors influencing the sales volume of SKC (Stock Keeping Color) of retail products and their effectiveness are studied with SPSS and R softwares, combined with one-way ANOVA and deep regression analysis. Then, the sales volume of a target subcategory is predicted in grey model with R software, and the accuracy of the prediction data is obtained with Excel software combined with the mean absolute percentage error method. Finally, the prediction model is used to predict the sales and inventory of a target category. The results show that the sales method has a significant effect on the SKC sales volume of retail products; the factors influencing the SKC sales volume of retail products include inventory, discount and selling price; the average absolute percentage error of the target subcategory in each week is mostly less than or equal to 1, and the smallest is 0, which can be considered as a high prediction accuracy of the model. The prediction results of the future sales and inventory of a target subcategory show that the supply of this subcategory is obviously higher than the demand, and the inventory management strategy needs to be adjusted appropriately. Reference | Related Articles | Metrics | Comments（0）

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Synthesis, Structure, and Photoluminescence Properties of Mn(II)-Based Metal Complex LIANG Yuxin, GAO Huizhi, WANG Xingyue, QI Zhikai Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 36-40.   DOI: 10.13438/j.cnki.jdzk.2021.06.006 Abstract （824）      PDF（pc） （2500KB）（317）       Knowledge map    Save A novel Mn-based complex of Mn(choline)Cl3 (choline=C5H14NO) was synthesized by solvent evaporation. Single crystal X-ray diffraction analysis shows that the crystal structure of this complex consists of one-dimensional chains formed by the edge-shared [MnCl5O] octahedra, and these chains link each other with the adjacent ones into a three-dimensional network through intermolecular hydrogen bonds.UV-vis absorption spectrum and photoluminescence spectrum shows that this complex exhibited high efficient red-light emission induced by the d-d electron transition of (t2g)3(eg) to (t2g)4(eg)1. The photoluminescence quantum yield reaches to 37.32% and the average lifetime is 1.18 ms. In addition, it has excellent thermal stability (300 ℃). These results show that this Mn-based complex has potential applications in the field of optoelectronic devices. Reference | Related Articles | Metrics | Comments（0）

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Existence of Solutions for Boundary Value Problems of  Hilfer-Hadamard Type Fractional Differential Equations DUAN Lijing, XIE Jingli, LIU Hanyan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 6-12.   DOI: 10.13438/j.cnki.jdzk.2021.03.002 Abstract （751）      PDF（pc） （329KB）（315）       Knowledge map    Save The existence and uniqueness of solutions for a class of three-point boundary value problems of fractional differential equations with Hilfer-Hadamard type fractional derivatives are studied. With Leray-Schauder alternative theorem and Banach fixed point theorem, the results for the existence and uniqueness of solutions for the boundary value problems are obtained. Reference | Related Articles | Metrics | Comments（0）

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Calculation Formula of Perfect Matching Number of Two Types of Graphs TANG Baoxiang, REN Han Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 1-3.   DOI: 10.13438/j.cnki.jdzk.2021.04.001 Abstract （788）      PDF（pc） （372KB）（295）       Knowledge map    Save Two new types of graphs mTn and mKn,n are constructed. Using the classification nested recursion method, the counting formulas for different 1-factors of graphs mTn and mKn,n are given. Reference | Related Articles | Metrics | Comments（0）

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A Study on the Ultrastructure of Two Species of Frustulia (Bacillariophyta) YUAN Li, LIU Bing, ZHOU Yangyan, DU Jie, ZHANG Wanying Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 59-65.   Abstract （506）      PDF（pc） （18679KB）（287）       Knowledge map    Save This paper reviews the naming changes of two Frustulia species and provides two new Chinese names for them: F. asiatica and F. amphipleuroides. Based on the observation of the light and scanning electron microscopy on the above two species, we find that: (1) the unique feature combination of F. asiatica is its linear-lanceolate valve shape and higher stria density; (2) the unique feature combination of F. amphipleuroides is 0~3 isolated poroids and obviously elongated central area. Reference | Related Articles | Metrics | Comments（0）

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Is the Social Connection as Close as Possible?：Based on An Empirical Study on the Impact of Resource Bricolage on the Performance of SMEs LI Lu, ZHANG Huaiying, ZHANG Yan Journal of Jishou University(Natural Sciences Edition)    2022, 43 (1): 77-84.   DOI: 10.13438/j.cnki.jdzk.2022.01.011 Abstract （959）      PDF（pc） （531KB）（282）       Knowledge map    Save Under the background of resource constraint,social connection has contingency effect on resource allocation and development process.Based on the resource orchestration theory,this paper integrates resource bricolage,social connection strength and innovation performance into the same analysis framework,and empirically tests the influence of resource bricolage on innovation performance of SMEs under the business connection strength and political connection strength.The results show that resource bricolage has a positive impact on innovation performance of small and medium-sized enterprises;The intensity of business connection plays a negative role in regulating the relationship between resource bricolage and the innovation performance of SMEs.The intensity of political connection plays a positive role in regulating the relationship between resource bricolage and the innovation performance of SMEs.Enterprise managers should put together the resource attributes and contents according to the current needs,and must actively think about strategies and selectively develop social ties. Reference | Related Articles | Metrics | Comments（0）

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An Optimized NMG Solution to an Improved Total Variational Registration Model HAN Xiaohua, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 44-49.   DOI: 10.13438/j.cnki.jdzk.2021.04.009 Abstract （436）      PDF（pc） （4177KB）（273）       Knowledge map    Save An improved total variational (TV) registration  model with both global smooth and discontinuous-preserving displacements is established by introducing hypersurface function as the kernel function of image registration regularization term. In the nonlinear multi-grid (NMG) method, a new smoothing method is constructed by using the interaction of delayed diffusion fixed point iteration and successive over relaxation iteration. And by interpolation of the errors on the coarse grid back to the fine grid using tomographic techniques during confinement, a fast and effective nonlinear multi-grid algorithm for solving improved TV model is designed. The experimental results show that the optimized NMG algorithm has higher registration accuracy and faster convergence than the NMG method. Improved TV model registration has less error, less time-consuming and better registration performance than TV model registration. Reference | Related Articles | Metrics | Comments（0）

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Doping Manipulationon the Electron Transport Properties of the Phosphorene-Boron Carbon Diphosphorus Heterojunction WU Dan, LIAO Wenhu, LIN Lie, LUO Shuzhen, CHENG Xiaoli Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 31-37.   DOI: 10.13438/j.cnki.jdzk.2021.04.007 Abstract （470）      PDF（pc） （2058KB）（273）       Knowledge map    Save Using the first-principles calculation method combining density functional theory and non-equilibrium Green's function, the electron transport properties of the armchair edge and the zigzag P-BC2P van der Waals heterojunction under finite bias are studied, and the influence of N-type electrons and P-type holes doping on the electron transport properties of the two edge types of heterojunctions. The research results show that: (1) Under the finite bias voltage, the two edge types P-BC2P van der Waals heterojunctions both exhibit nonlinear changes and negative differential resistance effects. The current growth of the P-BC2P heterojunction at the edge of the armchair is faster than that of the phosphorene nanoribbons, but the current growth of the P-BC2P heterojunction at the zigzag edge is slower than that of the phosphorene nanoribbons. (2) In the doping concentration range of 0.001~0.01 e/atom, N-type electrons/P-type holes doping can effectively control the conductance of P-BC2P heterojunction. Compared with the undoped, the conductance of the P-BC2P heterojunction at the edge of the armchair increases and decreases by up to 20% when doped with P-type holes, and decreases by up to 46.7% when doped with N-type electrons. The conductance of the zigzag edge P-BC2P heterojunction increases up to 196% when doped with P-type holes, and increases up to 164% when doped with N-type electrons. Reference | Related Articles | Metrics | Comments（0）

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Approximate Optimality Condition for Fractional Optimization Problems XIE Feifei, WANG Jiaolang, HU Lingli Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 21-26.   DOI: 10.13438/j.cnki.jdzk.2021.04.005 Abstract （772）      PDF（pc） （318KB）（272）       Knowledge map    Save In the case when the functions are not necessarily lower semicontinous and the sets are not necessarily closed, the fractional optimization problem is turned into a constraint optimization problem with Dinkelbach method. With the properties of ε-subdifferentials, some new constraint qualifications are introduced and some characteristic characterizations of ε-optimal solutions are established. Reference | Related Articles | Metrics | Comments（0）

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A New Distribution Record of Meehania zheminensis in Wuling Mountain，China LYU Heng, WANG Benyan, ZHANG Cheng, LIU Qun, ZHANG Daigui Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 70-72.   DOI: 10.13438/j.cnki.jdzk.2021.03.012 Abstract （737）      PDF（pc） （3314KB）（270）       Knowledge map    Save Reported a new record of Meehania zheminensis A. Takano, Pan Li & G.-H. Xia, which is similar to Meehania montis-koyae Ohwi a endemic species of Japan. M. zheminensis has been found and identified as M. montis-koyae at first in Zhejiang and Fujian provinces of China, believed M. zheminensis is a new species based more genetic and mor-phological data. This species is a new record of Wuling Mountain and also in Guizhou, Hunan and Hubei Province. All the voucher specimens were preserved in Herbarium of Jishou University (JIU). Reference | Related Articles | Metrics | Comments（0）

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Superconducting Magnetic Energy Storage Used for Grid Stability in Xiangxi YANG Yang, CHEN Guangsi, LI Linfeng, WANG Chaoming, LI Xinran, CHEN Changqing, LU Chunjing Journal of Jishou University(Natural Sciences Edition)    2021, 42 (5): 50-55.   DOI: 10.13438/j.cnki.jdzk.2021.06.009 Abstract （505）      PDF（pc） （2011KB）（263）       Knowledge map    Save Xiangxi  is the main power source of Hunan Province. The stability of Xiangxi regional power grid is affected by the seasonal  hydroelectric power generation and the  wind power generation. In order to improve the stability of Xiangxi regional power grid, the superconducting magnetic energy storage (SMES) system is connected to provide real-time and rapid power support to the power grid, so as to solve the instability problem caused by system failure or new energy access. We build an equivalent simplified model in power system analysis software package and simulate the disturbance of the power grid. Then we connect the superconducting magnetic energy storage system in above model, and analyze its positive impact on the stability of the system through the changes of the power angle and voltage of the system. Reference | Related Articles | Metrics | Comments（0）

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On Influencing Factors of Health Behavior Change of Rural Residents in Underdeveloped Areas：Model Construction Based on Theory of Planned Behavior GONG Fangmin, GONG Zhuliu Journal of Jishou University(Natural Sciences Edition)    2022, 43 (1): 64-76.   DOI: 10.13438/j.cnki.jdzk.2022.01.010 Abstract （531）      PDF（pc） （804KB）（263）       Knowledge map    Save We collected the data of rural residents in underdeveloped western Hunan through a questionnaire survey and in-depth interviews.Based on the data analysis,this paper analyzed the internal mechanism of farmers' health behavior change in the post-poverty alleviation era.Different from previous studies,this study attempts to integrate media use and health knowledge into the theoretical model of planned behavior and explores the influence of media use on farmers' health behavior through a structural equation model.The results show that:The use of media has a significant positive impact on rural residents' health behavior,and also has an indirect impact on health behavior through self-efficacy,behavioral attitude and subjective norms;Social media is an effective channel for the change of rural residents' health behavior;The unhealthy behaviors of rural residents mainly focus on smoking,drinking and eating preserved food by a positive attitude towards these behaviors.Cultural customs and power demands are the factors that are difficult to change unhealthy behaviors;The role of health knowledge is not significant,and there may be mediating variables from health knowledge to health behavior,and the proliferation of pseudo-health information that makes it difficult to achieve health knowledge adoption and thus does not lead to changes in poor health behavior. Reference | Related Articles | Metrics | Comments（0）

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Variable Neighborhood Artificial Bee Colony Algorithm  to Solve Distribution Center Location Problem JIANG Ting Journal of Jishou University(Natural Sciences Edition)    2021, 42 (5): 27-33.   DOI: 10.13438/j.cnki.jdzk.2021.06.005 Abstract （720）      PDF（pc） （521KB）（262）       Knowledge map    Save For the problem of logistics distribution center location，a variable neighborhood artificial bee colony (VNABC) algorithm is presented. In order to ensure the diversity of solutions and enhance the local search ability, the algorithm introduces variable neighborhood search, designs three neighborhood operators and improves the shaking strategy. In order to improve the convergence speed, the global optimum solution is used to replace the current solution in the onlooker bees phase.The simulation experiment results show that the algorithm has reached an effective balance between exploration and exploitation, and it performs well in terms of solution speed and stability. Reference | Related Articles | Metrics | Comments（0）

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Existence Theorems for Parabolic Sections of Quadratic Surface AN Bailing, ZHANG Deyan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 13-20.   DOI: 10.13438/j.cnki.jdzk.2021.03.003 Abstract （852）      PDF（pc） （339KB）（259）       Knowledge map    Save First, the necessary and sufficient conditions for the existence of parabolic section of a quadratic surface are given according to the parameter equation of the parabola. Secondly, the necessary and sufficient conditions for the existence of parabolic sections, which are parallel to the coordinate plane and  the z-axis and intersecting with the z-axis, are given respectively with combining the projection equations of the parabola and its invariant. Finally, the existence problem for parabolic sections of five typical quadratic surfaces is discussed. Reference | Related Articles | Metrics | Comments（0）

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Progress in the Diagnosis and Treatment of Primary Central Nervous System Diffuse Large B-Cell Lymphoma ZHANG Rujiang, ZHANG Yunzhou, GAO Daiquan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 54-61.   DOI: 10.13438/j.cnki.jdzk.2021.06.009 Abstract （702）      PDF（pc） （3932KB）（255）       Knowledge map    Save In order to further improve the understanding of primary central nervous system diffuse large B-cell lymphoma (PCNS-DLBCL), PubMed, CNKI and other databases were used to search related literature on the diagnosis and treatment of primary central nervous system lymphoma, and then The pathogenesis, clinical manifestations, diagnostic methods and treatment measures of PCNS-DLBCL are reviewed. PCNS-DLBCL is a subtype of extranodal non-Hodgkin’s lymphoma that can affect any part of the central nervous system. Its pathogenesis includes the presence of Epstein-Barr virus, increased expression of PD-L1 and PD-L2, MYD88 gene mutation and CD79B Gene mutations, etc.; clinical manifestations lack specificity, high degree of malignancy, easy to relapse, and poor prognosis; diagnostic methods include imaging examination, cerebrospinal fluid examination, immunohistochemistry and histopathological examination, pathological examination is the gold standard for diagnosis; PCNS-DLBCL treatment measures include radiotherapy, chemotherapy, autologous stem cell transplantation, and combined radiotherapy and chemotherapy. At present, induction chemotherapy based on high-dose methotrexate is the best treatment plan. Reference | Related Articles | Metrics | Comments（0）

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Load Forecasting of Urban Residential District Based on LSTM-AdaBoost LI Longxiang, PENG Chen, LI Jun, WANG Yuyan, LU Rongbo Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 30-35.   DOI: 10.13438/j.cnki.jdzk.2021.06.005 Abstract （530）      PDF（pc） （478KB）（248）       Knowledge map    Save In smart cities, accurate residential load forecasting is the key to achieving a balance between power supply and demand and reducing resource waste. In order to improve the accuracy of load forecasting of urban residential districts, a short-term load forecasting model LSTM-AdaBoost, which combines long and short-term memory network (LSTM) and ensemble learning, is proposed. The model uses dew point (the temperature at which water vapor in the air condenses into water droplets), historical load, week type and other characteristics as data input; then the LSTM network with timing memory function is used as the base learner for integrated learning; finally, the ensemble AdaBoost  algorithm performs a weighted combination of the base learner to obtain a strong learner. Experimental results show that the integrated LSTM-AdaBoost model has higher forecast accuracy than single forecasting methods such as LSTM network, support vector machine (SVM) and CART decision tree. Reference | Related Articles | Metrics | Comments（0）

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Necessity and Realization Path of Ideological and Political Education Integrated into College Physical Education GUO Haiying, HUANG Yuzhe Journal of Jishou University(Natural Sciences Edition)    2021, 42 (6): 89-92.   DOI: 10.13438/j.cnki.jdzk.2021.06.015 Abstract （885）      PDF（pc） （395KB）（244）       Knowledge map    Save Ideological and political education and physical education are the essential contents of college education. To integrate ideological and political education into school physical education is the necessary exploration under the new era and new situation, and the inevitable requirement of the big ideological and political pattern. At present, there are some problems in the integration of ideological and political education into college physical education, such as neglecting ideological and political education, outdated carrier, lack of path and strategy. The research suggests that we should not forget the original intention of physical education and attach importance to ideological and political education, innovate the means and carrier of ideological and political education, strengthen the training of teachers' curriculum ideological and political strategies, in the physical education teaching, extracurricular sports activities, sports competitions and other aspects of detailed curriculum ideological and political action into college physical education. Reference | Related Articles | Metrics | Comments（0）

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Effect of Propranolol Combined with Amiodarone on Malignant Arrhythmia BAI Song, ZHAO Dongxian, XU Shanshan, LI Juan, SU Xiaowei, LIU Yan Journal of Jishou University(Natural Sciences Edition)    2021, 42 (5): 61-64.   DOI: 10.13438/j.cnki.jdzk.2021.05.011 Abstract （660）      PDF（pc） （371KB）（239）       Knowledge map    Save To investigate the effects of propranolol combined with amiodarone on inflammatory factors and QT interval dispersion in patients with malignant arrhythmia. 92 patients with malignant arrhythmia treated in our hospital from February 2018 to June 2020 were randomly divided into two groups with 46 cases in each group. The control group was given amiodarone hydrochloride tablets on the basis of routine treatment, and the observation group was given propranolol hydrochloride tablets on the basis of the control group. The clinical efficacy, inflammatory factors, QT interval dispersion and adverse reactions were compared between the two groups. The results showed that the total effective rate in the observation group was 93.48%, which was higher than 78.26% in the control group (P<0.05). Tumor necrosis factor after treatment α， Interleukin-6, C-reactive protein and QT interval dispersion were lower than those before treatment, but more in the observation group (P<0.05). There were 3 cases of adverse reactions in the control group, which had no significant difference compared with 4 cases in the observation group (P>0.05). It shows that propranolol combined with amiodarone can significantly enhance the clinical efficacy, alleviate inflammatory reaction, reduce QT interval dispersion and have higher safety than amiodarone alone. Reference | Related Articles | Metrics | Comments（0）

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Self-Adaptive and Real-Time Pre-Fall Detection XIE Jing, YANG Panlong, WEI Xing Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 34-40.   DOI: 10.13438/j.cnki.jdzk.2021.03.006 Abstract （509）      PDF（pc） （555KB）（236）       Knowledge map    Save To detect falls before falling and to provide basis for fall prevention, this study proposes a self adaptive pre-fall detection method that combines SVM and threshold method. Experiment results show that this method has a longer interval time than the artifical threshold and SVM, and has higher recall rate and specificity than SVM. The self-adaptive pre-fall detection method can detect the fall before the fall impact. Reference | Related Articles | Metrics | Comments（0）

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Design of Controller for Pure Electric Bus Based on STM32 WANG Guoyi, YUAN Tao, YU Xingguo, LI Hao Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 52-56.   DOI: 10.13438/j.cnki.jdzk.2022.03.009 Abstract （435）      PDF（pc） （610KB）（232）       Knowledge map    Save A pure electric bus controller based on STM32 is designed through analyzing the function and running state of pure electric bus control. The function of each module of the controller is analyzed,and the power supply circuit and voltage detection circuit are designed. The controller adjusts the speed of the DC motor through outputting pulse width modulation with different duty cycles.The information collected by the sensor is transmitted to the microprocessor in real time through the CAN bus,and the microprocessor analyses the collected information and sends commands through CAN bus to control the running state of the bus safely,accurately and in real time. Reference | Related Articles | Metrics | Comments（0）

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Current Situation and Measures of Drum Dance Development of Miao Ethnic Group in Western Hunan Province:Activation and  Inheritance of Intangible Cultural Heritage XIA Chenchen Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 92-96.   DOI: 10.13438/j.cnki.jdzk.2022.06.016 Abstract （664）      PDF（pc） （433KB）（230）       Knowledge map    Save Drum dance of Miao ethnic group in western Hunan province is a national-level intangible cultural heritage with representative inheritors at the national,provincial,state,county and municipal levels.The project has been well protected,and has been well applied in ethnic and folk cultural and sports activities,school sports,tourism development and foreign cultural exchanges.However,there are still serious problems such as the aging of inheritors,the imperfect inheritance mechanism,and the challenges from modern entertainment.In order to improve the protection and inheritance effect of the drum dance,some measures need to be taken,such as cultivation of inheritors,creating demonstration area of "two innovation",and diversified and coordinated development. Reference | Related Articles | Metrics | Comments（0）

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Application of Monte Carlo Algorithm in Heat Transfer Model of Protective Clothing LIU Qianlan, LEI Yihui, XIAO Yujiang, DONG Yaling Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 52-56.   DOI: 10.13438/j.cnki.jdzk.2021.03.009 Abstract （771）      PDF（pc） （590KB）（229）       Knowledge map    Save Accurate establishment  scientific heat transfer model for thermal protective clothing can reduce the costs and shorten the cycle of research and development. Therefore, a preliminary temperature distribution model is established based on  heat conduction principles, and Fourier's law and is modified by retardation factors  with controlling parameters. Monte Carlo algorithm is then applied to obtain the relevant parameters in the temperature distribution model according to the experimental data.Finally, an excellent heat transfer model of protective clothing is obtained. Reference | Related Articles | Metrics | Comments（0）

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Error Bound Estimation for Linear Complementarity Problems of B-Matrices LI Huijun, MO Hongmin, HUANG Jiaxian Journal of Jishou University(Natural Sciences Edition)    2021, 42 (5): 20-26.   DOI: 10.13438/j.cnki.jdzk.2021.06.004 Abstract （661）      PDF（pc） （295KB）（226）       Knowledge map    Save According to the upper bound of the infinite norm of the inverse matrix of strictly diagonally dominant M-matrix, a new error bound of the solution of the linear complementarity problem of B-matrix is obtained by using the technique of inequality scaling. Reference | Related Articles | Metrics | Comments（0）

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Study on the Mechanism of Lily in the Treatment of Cognitive Impairment Based on Network Pharmacology and Molecular Docking LIU Ye, FU Chuanjun, LIU Na, LI Xianhui, LIU Xihan Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 74-82.   DOI: 10.13438/j.cnki.jdzk.2022.05.012 Abstract （366）      PDF（pc） （8180KB）（225）       Knowledge map    Save The mechanism of lily in the treatment of cognitive impairment was studied based on network pharmacology and molecular docking.The main active components and action targets of lily were obtained from TCMSP database.After screening,7 main active components were obtained.There were 465 potential action targets of the main active components of lily.Secondly,disease targets were obtained from GeneCards,OMIM,PharmGKB,DrugBank and CTD databases,and the intersection of lily chemical components and cognitive impairment targets was obtained by using Venny software.44 drug component-disease intersection targets were obtained.Using STRING database,the intersection target protein interaction (PPI) network was constructed.After screening,the core targets and core components were obtained.It was found that MAOB (monoamine oxidase B),CASP3 caspase 3),ESR1 (estrogen receptor),JUN (gene of chromosome 1),CASP8 (aspartic acid proteolytic enzyme 8),CASP9 (aspartic acid proteolytic enzyme 9),PGR (steroid receptor gene),AR (adrenergic receptor),SLC6A3 (dopamine transporter gene),PTGS2 (cyclooxygenase-2) were the key target proteins of lily pharmacodynamic components for the anti cognitive impairment effect.Metascape and DAVID platforms were used for GO function enrichment and KEGG pathway enrichment analysis,and Autodock Vina platform was used for molecular docking.The results showed that 4 active compounds of lily were related to 10 key core targets of cognitive impairment,and there were 30 key signal pathways involved in the regulation.Among them,stigmasterol,3-norcolchicine,β-Sitosterol,and rosin acid had high degree value.The target proteins with high degree value included MAOB,PTGS2,CASP3,CASP9,etc.The main pathways involved were neural activity ligand receptor interaction pathway,calcium signaling pathway,small cell lung cancer pathway and so on.The mechanism of lily in treating cognitive impairment may improve cognitive function by inhibiting the activity of monoamine oxidase B. Reference | Related Articles | Metrics | Comments（0）

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Optimization Path of Business Environment in Western Hunan from the Perspective of Collaborative Governance ZHANG Yanfei, ZHU Haiying Journal of Jishou University(Natural Sciences Edition)    2021, 42 (4): 75-81.   DOI: 10.13438/j.cnki.jdzk.2021.04.014 Abstract （615）      PDF（pc） （447KB）（214）       Knowledge map    Save Taking Western Hunan as an example, this paper explores the optimization path of business environment from the perspective of collaborative governance based on multiple stakeholders. The paper constructs the theoretical mechanism of regional business environment optimization from the perspective of collaborative governance, and proposes that it is necessary to integrate the objectives of different stakeholders, protect the rights and interests of multiple stakeholders, build a scientific operation mechanism, and pay attention to the impact factors such as the quality of legal system, service supervision coordination and supporting environment. The research shows that the optimization of business environment in Western Hunan is faced with such problems as the high cost of enterprise elements, the lack of collaborative ability of government services, the lack of coordination of legal guarantee, and the poor linkage of supervision and law enforcement. Therefore, in order to stimulate the vitality of regional market entities and enhance the collaborative governance ability of the main bodies, we should effectively play the role of the government and the market, build a cooperative operation mechanism among multiple subjects, improve the level of coordination of legal protection, and enhance the coordination of law enforcement and supervision. Reference | Related Articles | Metrics | Comments（0）

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Control Strategy of Variable Frequency Speed Regulation System Based on Multi-Drive HU Xiaofeng Journal of Jishou University(Natural Sciences Edition)    2021, 42 (3): 57-62.   DOI: 10.13438/j.cnki.jdzk.2021.03.010 Abstract （607）      PDF（pc） （2959KB）（209）       Knowledge map    Save This paper presents a multi drive variable frequency speed control system. The topology of the system is AC-DC-AC structure, and the control performance is AC-AC direct conversion. Zero current commutation strategy and PWM control strategy can get good input current and output voltage waveform, and realize safe commutation. In the following, the correctness of the theory proposed in this paper is proved by the simulation results. Reference | Related Articles | Metrics | Comments（0）

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Shape Reconstruction Based on Polarization and Coarse Depth Images ZHOU Mengyuan, YANG Fenlin Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 20-26.   DOI: 10.13438/j.cnki.jdzk.2022.04.005 Abstract （430）      PDF（pc） （2291KB）（207）       Knowledge map    Save Firstly,the coarse depth image is smoothed by bilateral filtering,which can remove noise well while keeping edge details.Then,the depth information is taken as a prior condition to correct the ambiguity of polarization normals by using a self-defined threshold segmentation method.Finally,a penalty function method with depth constraint as the fitting term and polarization normal constraint as the smooth term is constructed,and the least square method is used to calculate the fusion reconstruction.Four polarization images with different polarization angles and a coarse depth map are selected for experiments.The experimental results show that compared with single mode,the fusion of depth and polarization can recover better surface details and achieve better geometric shape effect. Reference | Related Articles | Metrics | Comments（0）

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Impact of Financial Openness on Financial Agglomeration and Regional Heterogeneity  of Yangtze River Delta Urban Agglomeration： Clustering Analysis Based on Feature Extraction MA Hanjiang, YU Xiaolan Journal of Jishou University(Natural Sciences Edition)    2022, 43 (1): 85-96.   DOI: 10.13438/j.cnki.jdzk.2022.01.012 Abstract （440）      PDF（pc） （2770KB）（206）       Knowledge map    Save According to the panel data of 26 cities in the Yangtze River Delta urban agglomeration from 2005 to 2018,this paper uses factor analysis to evaluate the degree of financial agglomeration of cities over the years,and uses the financial openness index to conduct the K-means dynamic clustering division based on feature extraction,and empirically analyzes the impact of financial openness on the financial agglomeration of cities in the Yangtze River Delta.The results show that,on the whole,financial opening up has a significant positive impact on the degree of urban financial agglomeration,but this promoting effect is mainly concentrated in the developed cities with higher level of financial opening up,and shows a negative inhibitory effect in the less developed cities with lower level of opening up,which shows obvious heterogeneity among regions. Reference | Related Articles | Metrics | Comments（0）