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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
    Abstract617)      PDF(pc) (323KB)(385)       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.
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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
    Abstract594)      PDF(pc) (1094KB)(293)       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.
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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
    Abstract619)      PDF(pc) (433KB)(207)       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.
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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
    Abstract419)      PDF(pc) (610KB)(199)       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.
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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
    Abstract330)      PDF(pc) (8180KB)(193)       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.
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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
    Abstract405)      PDF(pc) (2291KB)(190)       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.
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    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 96-96.  
    Abstract142)      PDF(pc) (146KB)(187)       Save
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    Liu Estimation in Partially Linear Varying Coefficient Models
    AN Bailing, LU Qi, MA Ning
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.04.001
    Abstract436)      PDF(pc) (335KB)(184)       Save
    This paper considers the biased estimators on the parameter components in partially linear varying coefficient model.Based on the Profile least-square approach and Liu estimation method,we propose Profile-Liu estimator and section least-square general Liu estimator for the parametric components.We prove that the Profile-Liu estimation is better than the Profile least-square estimation,and the section least-square general Liu estimation is better than the Profile-Liu estimation under certain conditions.
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    Proof of Gracefulness of Crowns of Two Kinds of Graceful Graphs
    TANG Baoxiang, REN Han
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 1-5.   DOI: 10.13438/j.cnki.jdzk.2022.06.001
    Abstract351)      PDF(pc) (425KB)(181)       Save
    This paper uses the construction method to give the graceful labels of the crowns I(Tn) and I(1-∧C4,n) of the graceful graphs Tn and 1-∧C4,n,thus proving that both I(Tn) and I(1-∧C4,n) are graceful graphs.
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    Thermal Lens Effect with Low-Power Laser
    LIN Yiping, CHEN Kexiong, LI Lingyan, LIU Jingfeng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 34-41.   DOI: 10.13438/j.cnki.jdzk.2022.04.007
    Abstract478)      PDF(pc) (4462KB)(175)       Save
    COMSOL Multiphysics 5.5 software was used to build a model to study the relationship between the change of lens focal length and the change of laser power.The experimental scheme was designed through theoretical analysis and the formula for calculating the focal length of the thermal lens was determined.Experiments were conducted to explore the thermal lens effect with low power laser,and the visualization of the thermal lens effect with low-power laser was realized.The soy sauce lens was measured as thermal concave lens.Using knife edge method and software fitting measurement of laser radius,combined with other data to calculate the focal length of the thermal concave lens,the measured relative error was 3.6%.Finally,taking the focal length as the intensity reference of the thermal lens effect,the measured intensity of the thermal lens effect was positively correlated with the optical power.
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    Preparation of Li4Ti5O12 by Solid-State Method and Exploration of Calcination Temperature
    LONG Ruilai, WU Xianming, WU Xiuting, YIN Caishuo
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 72-78.   DOI: 10.13438/j.cnki.jdzk.2022.03.012
    Abstract436)      PDF(pc) (7320KB)(168)       Save
    Li4Ti5O12 powders were prepared by solid-state reaction and two-step calcination method with Li2CO3 and TiO2 as starting materials and anhydrous ethanol as dispersant.The microstructure and morphology of the materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The electrochemical properties of the materials were tested by constant current charge-discharge,AC impedance and cyclic voltammetry.The results show that the pure phase Li4Ti5O12 with complete crystal structure could be synthesized after calcination at 800  ℃ for 6h,and uniform dispersion with particle size of 200~400 nm.The first reversible specific capacity of the Li4Ti5O12 sample was 157.67 mA·h/g at the rate of 0.5 C,and the coulombic efficiency was 96.1%,the capacity retention was 94.3% after 100 cycles.The first reversible specific capacity was 107.0 mA·h/g at the rate of 0.5C,the coulombic efficiency was 96.1% and capacity retention was 84.1% after 1 000 cycles.
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    Reflection Model of Lambert Surface in Three Light Sources
    XU Xuemei, YANG Fenlin
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 30-33.   DOI: 10.13438/j.cnki.jdzk.2023.01.005
    Abstract552)      PDF(pc) (437KB)(168)       Save
    In order to idealize the reflection model of object surface,the scene radiance of the Lambertian object illuminated by the strip light source,the uniform light source and the hemispherical uniform light source is derived by the radiance and the spherical triangle formula,and then the Lambertian surface reflection model in three kinds of light sources is obtained.
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    Existence and Uniqueness of Solutions for a Class of Fractional Differential Equations with Boundary Value Problems
    LI Yiyun, XIE Jingli
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (3): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.03.001
    Abstract428)      PDF(pc) (315KB)(167)       Save
    With Banach contraction mapping principle and Krasnoselskii's fixed point theorem,we obtain the existence and uniqueness of solutions for nonlocal boundary value problems of nonlinear fractional differential equations with Caputo and Hilfer-Hadamard fractional derivative.
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    Design and Optimization of Permission Control System with Distributed Architecture
    LEI Yunxiang, JIANG Qihai, TIAN Jie, DUAN Mingxiu
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 26-31.   DOI: 10.13438/j.cnki.jdzk.2022.06.006
    Abstract393)      PDF(pc) (1010KB)(166)       Save
    Aiming at the low performance and difficult maintenance of traditional permission control system,a new distributed permission management system based on JSON Web Token(JWT) technology is designed and implemented.The system adopts the mode of "centralized authentication and decentralized identification",which improves the overall performance and efficiency of the system.
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    Study on Plant Resources of Military Materia Medica in Western Hunan (Ⅳ):Investigation and Analysis of Poisonous Plant Resources
    XIAO Meiqi, LI Zhen, LI Zhenhui, ZHANG Yangyang, XIANG Xiaomei, CHEN Gongxi
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 20-29.   DOI: 10.13438/j.cnki.jdzk.2022.05.004
    Abstract376)      PDF(pc) (903KB)(166)       Save
    In order to enrich the military herbal resource database in western Hunan,and better develop and utilize the materia medica resources for military purposes,the toxic plant resources of military materia medica in Xiangxi Autonomous Prefecture,Zhangjiajie City and its surrounding areas were statistically analyzed through field investigation and literature review.The results show that there are 203 species,belonging to 136 genera and 67 families of poisonous plants in Western Hunan;life habits are mainly of perennial herbs.The habitat is dominated by forest.As for the distribution,the number of poisonous plants increases first and then decreases with the increase of elevation.In the horizontal distribution,the abundance of poisonous plants in the northwest of Hunan is higher than that in the south.The differentiation of geographical elements from the family level to the genus level and then to the species level has gradually become larger.At the family level,most of the poisonous plants in western Hunan can be found around the world;at the genus level,most of them are distributed in the north temperate zone;at the species level,the dominant species are of east Asian species (endemically distributed in China).The majority of toxic plants are of whole-part toxic plants with small toxicity.The toxicological effects are mainly nervous system toxicity and mucosal irritation toxicity.
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    Lattice Boltzmann Numerical Method for the Extended Fisher-Kolmogorov Equation
    FENG Yingxin, DAI Houping, WANG Chen, WEI Xuedan
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 19-30.   DOI: 10.13438/j.cnki.jdzk.2023.04.003
    Abstract215)      PDF(pc) (2738KB)(165)       Save
    A new numerical format for solving the extended Fisher-Kolmogorov (EFK) equation is constructed based on the lattice Boltzmann method.The Taylor expansion and Chapman-Enskog multiscale expansion techniques are used to obtain the local equilibrium state distribution functions and correction functions of the lattice Boltzmann model for the one-and two-dimensional EFK equations,and to further recover the corresponding macroscopic equations.On this basis,stability conditions for the iterative format of the model are derived,and the model is used to solve the initial marginal value problem of the EFK equation.
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    Research Status of Chinese Ethnic Traditional Sports Based on Knowledge Graph Visual Analysis
    LI Ping, WU Mengyi, ZHOU Zili, ZHANG Chunxiao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 91-96.   DOI: 10.13438/j.cnki.jdzk.2023.04.011
    Abstract227)      PDF(pc) (3959KB)(164)       Save
    Taking the research on traditional ethnic sports in China in recent 10 years as an example,this paper uses CiteSpace 6.1.R6 software and makes visualization analysis  of 211 core journal papers and 710 master and doctoral papers collected in CNKI database from 2010 to 2022,and analyzes the development of traditional ethnic sports from the chronological perspective.The results showed that in 2017,the number of papers published in the core journals of ethnic traditional sports research reached its peak,and then the number of related literatures decreased.The overall development trend can be summarized into three periods,namely stable period,peak period and cool-off period.Research hotspots include inheritance,development,traditional sports and sports culture,etc.The key words include "current situation","colleges and universities","development situation" and "Wushu".The research field mainly focuses on the connotation,development,inheritance and innovation of traditional national sports.The development of Chinese ethnic traditional sports has begun to take shape.The future research trend will be explored with the requirement of modernization development as guidance.
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    Delayed Predator-Prey Model with Stage-Structure and Cannibalism
    ZHANG Zizhen, ZHANG Weishi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 1-8.   DOI: 10.13438/j.cnki.jdzk.2023.04.001
    Abstract256)      PDF(pc) (1054KB)(164)       Save
    A delayed predator-prey model with stage-structure in prey population and cannibalism in predator population is studied in the present paper.Taking the pregnancy delay of predator population as the bifurcation parameter,local asymptotic stability and existence of local Hopf bifurcation of the model are discussed by using the eigenvalue method,and the critical value of the delay at which the local Hopf bifurcation exhibits is derived.Then,the properties of the Hopf bifurcation are studied by means of the central manifold method.Finally,a simulation example is performed to verify the correctness of the obtained results.
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    Changsha Dialect Recognition Based on CTC-GRU Model
    LIANG Xiaolin, SHEN Xiangfei, LIANG Zhao, QIU Hailin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 45-52.   DOI: 10.13438/j.cnki.jdzk.2022.02.008
    Abstract474)      PDF(pc) (589KB)(164)       Save
    In order to recognize continuous speech in Changsha dialect with a large vocabulary,a gated linear element neural network model based on Connectionist Temporal Classification(CTC) algorithm is proposed.Firstly,the characteristic parameters of speech are extracted by Mel-scale Frequency Cepstral Coefficients(MFCC),and then the extracted characteristic parameters are input into gated linear unit neural network.CTC algorithm is used for training and optimization,and the whole prediction label of input sequence is obtained.Finally,the results of the CTC model,the GRU model and the CTC-GRU model are compared on the self-built corpus of Changsha dialect,and the Word Error Rate(WER) is taken as the evaluation index.The results show that the CTC-GRU model can achieve faster convergence and greater accuracy compared with the other two models.
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    Comprehensive Evaluation and Spatial Distribution Characteristics of Soil Fertility in Xiangxi Prefecture
    PENG Huan, ZHOU Ying, ZENG Hanyong, LUO Jin, LI Qiang, HE Jianwu
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 38-44.   DOI: 10.13438/j.cnki.jdzk.2022.06.008
    Abstract399)      PDF(pc) (12300KB)(163)       Save
    The comprehensive evaluation of soil fertility in Xiangxi autonomous Prefecture provides a basis for improving soil fertility and building high-quality farmland.Soil pH,organic matter,total nitrogen,available phosphorus,and available potassium were selected as evaluation indicators,combined with the index summation method,a comprehensive evaluation system of soil fertility is constructed,and the soil fertility is comprehensively evaluated.The results showed that the soil pH in Xiangxi Prefecture is acid,there is slight soil acidification,the content of organic matter is high,the content of total nitrogen is moderate,the content of available phosphorus and available potassium vary greatly,and the average content was high.The proportion of soil area with grade I,II,III and IV fertility in Xiangxi Prefecture was 17.66%,17.62%,8.21% and 56.51% respectively.
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    Topological States of Two-Dimensional Honeycomb Elastic Materials
    LI Yinming, KONG Peng, BI Rengui, HE Zhaojian, DENG Ke
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (4): 47-50.   DOI: 10.13438/j.cnki.jdzk.2022.04.009
    Abstract442)      PDF(pc) (1996KB)(160)       Save
    We introduce the concept of valley states to elastic materials and design a two-dimensional honeycomb elastic phonon crystal.When the system is protected by inverse symmetry,three pairs of Dirac points appear at the K and K′ point,distributed in different frequency bands.The spatial symmetry of the system is broken by adjusting its geometrical structure parameters so that the Dirac points open and form valley at the K and K′ point.In this multi-band valley exists edge states connecting the upper and lower body bands,which is used in elastic materials can be used to achieve edge transport and design acoustic devices with good performance.
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    Differentiability for Measure Neutral Functional Differential Equation
    TIAN Rui, LI Baolin
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 1-6.   DOI: 10.13438/j.cnki.jdzk.2023.02.001
    Abstract286)      PDF(pc) (323KB)(160)       Save
    In the framework of the theory of generalized ordinary differential equations,by virtue of the one-to-one correspondence between measure neutral functional differential equations and generalized ordinary differential equations,sufficient conditions for differentiability of measure neutral functional differential equations are put forward.On the basis of defining a new operator Ψ(λ,y)(t),differentiability for measure neutral functional differential equations is proved.
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    Improved of Source Code Plagiarism Detection Based on Abstract Syntax Tree
    LIU Feixiang, LONG Dongdong, OU Xingru, CHEN Changfeng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 20-25.   DOI: 10.13438/j.cnki.jdzk.2022.06.005
    Abstract487)      PDF(pc) (371KB)(159)       Save
    For low detection accuracy and inability to detect plagiarism at the semantic level in the traditional abstract syntax tree based code plagiarism detection methods,an improved code plagiarism detection approach based on abstract syntax tree is designed.This approach achieves higher plagiarism detection rate through TF-IDF weighted simplified syntax tree.Moreover,feature extraction and similarity calculation methods based on weighted simplified abstract syntax tree are designed to realize partial detection of semantic plagiarism.Experimental results show that the proposed approach can effectively detect semantic level plagiarism and achieves higher accuracy than traditional tree-based methods.
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    Synthesis,Crystal Structure of the Novel Rhodium(Ⅱ) Complex
    LIU Xue, TIAN Yiran, FENG Yangyang, XU Mingming, CHEN Honglai, HOU Wenming, ZHANG Zhenqiang, LIU Weiping
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 55-68.   DOI: 10.13438/j.cnki.jdzk.2023.04.007
    Abstract248)      PDF(pc) (10002KB)(156)       Save
    Using rhodium(Ⅱ) acetate and trimethylrhodium acetate(Ⅱ) as the raw material,with 3,6-dibromo-9-(4-pyridinemethyl)-9H-carbazole (DBPMC1) and 3,6-dibromo-9-(3-pyridinemethyl)-9H-carbazole (DBPMC) as axial ligands,four rhodium(Ⅱ) carboxylates axial dibromo-9-pyridylmethyl-9H-carbazole complexes Rh(OOCR)4(DBPMC) were designed and synthesized.The single crystals of compounds were successfully cultured and their chemical structures were initially characterized by modern analytical methods such as H NMR,13C NMR and FT-IR.The results show that none of these four compounds has been reported in the literature,and they belong to a new type of rhodium carboxylate (Ⅱ) axial complex.The structure of the complex was determined by X-ray single crystal diffraction analysis to be composed of one molecule of rhodium(Ⅱ) carboxylate and two molecules of DBPMC ligand,and the molecular structure diagram and unit cell stacking diagram were drawn.
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    D-N Alternating Method Based on the Curved Edge Finite Element for Anisotropic Exterior Problems in a Concave Angle
    TU Mingyue
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 31-38.   DOI: 10.13438/j.cnki.jdzk.2023.04.004
    Abstract197)      PDF(pc) (374KB)(152)       Save
    Based on the natural boundary element theory of curved edge finite element,a D-N alternating method with curved edge finite element is established to solve anisotropic elliptic exterior problem in the infinite domain with a concave angle,and to give the error estimation and convergence of the approximate solution of the D-N alternating method.
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    Estimations of a Ros Deficit
    GUO Ruyi, MEI Jingfang
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 8-12.   DOI: 10.13438/j.cnki.jdzk.2023.03.002
    Abstract218)      PDF(pc) (279KB)(147)       Save
    The upper and lower bounds of a Ros deficit are obtained with the geometric quantities such as the area of the involute line and Wigner caustics of the plane strictly closed convex curve  Γ.
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    Antibacterial Activity and Identification of Endophytic Fungi YDZ-8 Isolated from Lavandula angustifolia Mill.
    CHEN Tianyi, BAIDOULA·Nulan, TUERDEBIEKE·Mayila, ENTOMACKY·Borrathyba
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 47-51.   DOI: 10.13438/j.cnki.jdzk.2023.02.007
    Abstract284)      PDF(pc) (2024KB)(146)       Save
    The endophytic fungi were isolated from the roots of Lavandula angustifolia Mill. by surface disinfection method and tissue isolation method,and the antibacterial activity against the Staphylococcus aureus was evaluated by paper disk diffusion method.The active isolates were identified in terms of  their morphological features by phylogenetic analysis based on ITS sequence of rDNA gene.The results showed that the endophytic fungi of YDZ-8 had remarkable antibacterial activity against Staphylococcus aureus strain CGMCC1.872.Fungal morphological and molecular identification demonstrated that the endophytic fungi strain YDZ-8 represented Trichoderma harzianum.
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    Research on the Effect Evaluation of Integrating Revolutionary Culture into Tourism Management Graduate Education based on Entropy-Fuzzy Comprehensive Evaluation Method
    WANG Zhaofeng, WU Yinfeng
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 83-90.   DOI: 10.13438/j.cnki.jdzk.2023.04.010
    Abstract215)      PDF(pc) (700KB)(145)       Save
    Taking tourism management graduate students of colleges and universities as the research object,this research uses entropy method and fuzzy comprehensive evaluation method to evaluate the effect of integrating revolutionary culture into tourism management graduate education.The results showed that 25.89% of the teachers and students think the effect  is very good,41.92% of the teachers and students think the effect is good,32.19% of the teachers and students think the effect is not good.Therefore,to improve  the effect of integrating revolutionary culture into tourism management graduate education,it is necessary to optimize the tourism management graduate student education program,incorporate revolutionary culture into coursebook,class,and ideology,innovate and optimizate tourism management graduate student education content and form,and promote  the "three whole education" system.At the same time,it is necessary to strengthen the construction of tourism management disciplines and professional teachers to promote the high-quality development of tourism management personnel training.
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    New Way of Industrialization  for Zhangjiajie,a Tourism City
    DENG Yulu
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 68-72.   DOI: 10.13438/j.cnki.jdzk.2022.02.011
    Abstract430)      PDF(pc) (430KB)(142)       Save
    The necessity,problems and historical opportunities of strengthening industrialization  in Zhangjiajie City are analyzed,and suggestions are made to promote the deep integration of industry and tourism,strengthen the construction supporting industrial  facilities,cultivate a new industrial system,and improve the policy making for industrial development.
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    A Novel MEHM Blind Spectrum Sensing Algorithm Based on Random Matrix Theory
    LIU Tingting, LEI Kejun, TAN Zhewen, TIAN Chong, TIAN Xinxin, YANG Xi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 33-38.   DOI: 10.13438/j.cnki.jdzk.2023.02.005
    Abstract365)      PDF(pc) (934KB)(141)       Save
    A novel maximum eigenvalue-harmonic mean (NMEHM) blind spectrum sensing algorithm is proposed,using the results of the distribution of the limiting eigenvalues of the sample covariance matrix in random matrix theory.The proposed algorithm significantly improves the detection performance of the traditional MEHM algorithm and achieves better detection performance than the classical eigenvalues-based detection algorithms;at the same time,the proposed algorithm does not require a priori knowledge of the primary user signal and wireless channel,which can availably overcome the effect of noise uncertainty.Simulation results demonstrate the validity of the proposed algorithm.
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    Optimal Multiband Collaborative Spectrum Sensing Algorithm Based on Constrained PSO Algorithm
    TIAN Chong, LIU Tingting, TAN Zhewen, TAN Yuhao, LEI Kejun, YANG Xi
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 34-38.   DOI: 10.13438/j.cnki.jdzk.2023.03.005
    Abstract263)      PDF(pc) (454KB)(141)       Save
    For the difficulties in controlling the total interference of the system with unconstrained PSO algorithm,an optimal multiband cooperative spectrum sensing method based on constrained Particle Swarm Optimization (PSO) algorithm is proposed.This algorithm transforms the constrained optimization problem into an unconstrained optimization problem by introducing a penalty function.Compared with the traditional solutions based on unconstrained PSO algorithm,the proposed constrained PSO algorithm can effectively solve the constrained multiband cooperative spectrum sensing optimization problem,and the optimal solution meets the constraints to avoid excessive total interference.
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    Method for Solving the Abel Integral Equation of the Downline Problem
    XING Jiasheng
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 6-10.   DOI: 10.13438/j.cnki.jdzk.2022.06.002
    Abstract457)      PDF(pc) (326KB)(139)       Save
    For the solution of the downline problem with a given descent time function,the problem is transformed into an Abel integral equation solution problem.For the integral equation on infinite interval,this paper introduces Abel's method and the process of solving integral equation with Laplace transformation,and gives the solution formula.For the limited range of integral equation,this paper uses the Abel integral transformation method to solve the integral equation,uses the iterated integral to exchange integral sequence,and obtains the solution formula from a definite integral identity.The solution formula of the integral equation is applied to the isochronous curve problem.The isochron is proved be an inverted cycloid with the solution of  the differential equation of the isochronous curve problem.
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    Improved YOLOv4 Lung Nodule Detection Algorithm
    LIN Kunhuang, LI Jianfeng, WANG Yang, LIU Zhijie, LIU Zheyu
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (1): 24-29.   DOI: 10.13438/j.cnki.jdzk.2023.01.004
    Abstract420)      PDF(pc) (4395KB)(137)       Save
    An improved YOLOv4 lung nodule detection algorithm is designed to solve the problems of small target missing detection and lung nodule position distortion in the target detection YOLOv4 algorithm.On the basis of the original YOLOv4 network,the up sampling process of the feature fusion network is replaced by the bilinear interpolation method,and the tensor stacking method is used to make the semantic information of the top layer and the location information of the bottom layer to form a higher channel feature tensor.The experimental results show that,compared with the original YOLOv4 algorithm,the average accuracy and prediction speed of the improved YOLOv4 algorithm on the public dataset LUAN16 are improved by 4.54% and 28.1% respectively,and the visualization results have more accurate position expression.
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    Statistical Measurement of the Inadequate Development
    LIU Fanfan
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 58-66.   DOI: 10.13438/j.cnki.jdzk.2022.06.011
    Abstract304)      PDF(pc) (717KB)(136)       Save
    An index evaluation system including development quality and benefit, innovation ability, environmental protection and people's livelihood is constructed.In 2008-2018, China's development inadequacy decreased at an average annual rate of 2%, of which environmental protection contributed the most; however, the regional imbalance of the development inadequacy is growing. To improve the quality, efficiency and innovation ability of the development of the western region is the key to improve the inadequacy of development in China.
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    Existence of Positive Solution for a Class of Fractional Four-Point Boundary Value Problems
    PAN Xinyuan, HE Xiaofei
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 1-6.   DOI: 10.13438/j.cnki.jdzk.2022.02.001
    Abstract368)      PDF(pc) (276KB)(135)       Save
    By applying Green's function,Arzela-Ascoli theorem and fixed point theorem on cones,the existence of positive solution is obtained for a class of p-Laplacian type fractional differential boundary value problems.
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    Allowed Transformations and Symmetry Groups of Variable-Coefficient Gordoa-Pickering Equation
    SU Dan, YONG Xuelin
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (2): 7-10.   DOI: 10.13438/j.cnki.jdzk.2022.02.002
    Abstract431)      PDF(pc) (305KB)(134)       Save
    The allowed transformations of the variable coefficient Gordoa-Pickering (VCGP) equation with six arbitrary functions are obtained.These transformations keep the form of the equation invariant but possibly change the arbitrary coefficients.Based on the allowed transformations,two types of Lie point symmetry groups are found.Finally,symmetry reductions and group invariant solutions of the VCGP equation are also considered.
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    Multi-Attribute Group Decision Making Algorithm of Weighted Hesitant Fuzzy Set and Its Application
    ZHU Guocheng
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (4): 9-18.   DOI: 10.13438/j.cnki.jdzk.2023.04.002
    Abstract229)      PDF(pc) (436KB)(134)       Save
    In order to describe the multi-attribute group decision information of hesitant fuzzy set more comprehensively,the weighted hesitant fuzzy set is defined by adding the associated comprehensive weight of decision expert to the membership degree of hesitant fuzzy set.On the basis of using weighted hesitant fuzzy set to describe decision information,two algorithms for sorting alternative solutions based on single attribute view are established.Finally,the feasibility of the two algorithms are verified by a concrete case.The results show that the two algorithms are easy to operate and calculate,and can be converted into each other.
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    Study on Traditional Medicinal Preparation Technology of Jixiang Cough Ointment
    LI Jin, LUO Yuanqiang, WU Yizhen, PENG Yong, HUANG Li
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 83-88.   DOI: 10.13438/j.cnki.jdzk.2022.05.013
    Abstract447)      PDF(pc) (414KB)(131)       Save
    The standard for traditional medicinal preparation technology of Jixiang cough ointment has been established.The extraction rate (dry extract) reached 96.21% through three times of decoction with drinking water for 2 hours,2 hours,and 1 hour respectively.The extracts were filtered and combined for three times,and concentrated in the low-temperature hot reflux extraction and concentration equipment to obtain clear paste with a relative density of 1.15~1.25.A proper amount of rock sugar was boiled with water to make honeycomb-like syrup.When the relative density of syrup was greater than 1.4 (80 ℃),clear paste was added (the ratio of clear paste to syrup was 1∶1.5),and the paste was collected at normal pressure.The paste was concentrated with relative density 1.25~1.40,with addition of 0.1% potassium sorbate,and then was encapsulated.The extraction,concentration,sugar refining,paste collection,and paste collecting processes of Jixiang cough ointment are compatible with the equipments in the preparation room.It is a traditional Chinese medicinal preparation.The quality of the finished products is stable and meets the requirements,and it can be produced in the hospital preparation room.The preparation process is stable,simple,reproducible,and effective.
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    Fuzzy Stochastic Pricing Model for Credit Asset-Backed Securities
    ZHANG Jinlun, ZHANG Yong
    Journal of Jishou University(Natural Sciences Edition)    2022, 43 (6): 51-57.   DOI: 10.13438/j.cnki.jdzk.2022.06.010
    Abstract317)      PDF(pc) (452KB)(130)       Save
    Based on the characteristics of the loan prepayment behavior,the pricing model of credit asset-backed securities in the fuzzy random environment is constructed by taking the price as a fuzzy random variable.Through algorithm analysis,the method of calculating the membership degree of credit asset-backed securities with known price is given,and the practicability of pricing model is verified through numerical examples and static analysis.The results show that the pricing model in the fuzzy stochastic environment is the general form of the traditional pricing model.
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    A Survey on Employment of Statistics Graduates from Universities in Western Regions
    CHEN Wangxue, PAN Hao
    Journal of Jishou University(Natural Sciences Edition)    2023, 44 (3): 87-90.   DOI: 10.13438/j.cnki.jdzk.2023.03.013
    Abstract222)      PDF(pc) (830KB)(125)       Save
    Taking the employment data of statistics graduates of Jishou University from 2015 to 2019 as a case,this paper analyzes the employment of graduates from three aspects of employment industry,employment position and employment region.The results indicate that the employment situation for statistics graduates is optimistic,characterized by multiple choices in employment industries and strong professionalism in employment positions.Based on the current employment status,some suggestions are put forward to improve the employment competitiveness of statistics graduates.
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