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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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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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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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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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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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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 Abstract （600）      PDF（pc） （437KB）（206）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （469）      PDF（pc） （7320KB）（205）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （505）      PDF（pc） （4462KB）（204）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （460）      PDF（pc） （335KB）（199）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （403）      PDF（pc） （903KB）（196）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （260）      PDF（pc） （3959KB）（194）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Journal of Jishou University(Natural Sciences Edition)    2023, 44 (2): 96-96.   Abstract （150）      PDF（pc） （146KB）（192）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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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 Abstract （276）      PDF（pc） （1054KB）（188）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （238）      PDF（pc） （2738KB）（183）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （367）      PDF（pc） （425KB）（183）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （456）      PDF（pc） （315KB）（182）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （274）      PDF（pc） （10002KB）（180）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （416）      PDF（pc） （1010KB）（178）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （514）      PDF（pc） （371KB）（171）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （432）      PDF（pc） （12300KB）（171）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （225）      PDF（pc） （374KB）（171）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （237）      PDF（pc） （279KB）（166）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （300）      PDF（pc） （323KB）（166）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （452）      PDF（pc） （1996KB）（165）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （447）      PDF（pc） （4395KB）（158）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （244）      PDF（pc） （700KB）（157）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （290）      PDF（pc） （454KB）（155）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （387）      PDF（pc） （934KB）（154）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （309）      PDF（pc） （2024KB）（154）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （253）      PDF（pc） （436KB）（152）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （322）      PDF（pc） （717KB）（150）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Sentiment Analysis Model of Specific Target Text Based on Convolutional Neural Network YE Haiyan Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 24-29.   DOI: 10.13438/j.cnki.jdzk.2024.01.005 Abstract （84）      PDF（pc） （741KB）（148）       Knowledge map    Save In the process of emotion analysis of specific target text,text sequence classification is limited by the labeling method,resulting in low accuracy and recall of analysis results,so a model of emotion analysis of specific target text based on convolution neural network is constructed.Specific target text sequences are analysed based on emotional differences,and the text feature matrix is used as input data to construct a convolutional neural network language model in the input layer,concatenating it into a part of speech sequence matrix.Segmented pooling captures different key features of text sequences and classifies and processes the extracted feature vectors.A dropout mechanism is added to complete sentiment classification of specific target texts,determine the importance information of each word in the text,and achieve sentiment analysis of specific target texts.The experimental results show that the accuracy of the model is higher than 84%,and the maximum recall rate is 87%,which can effectively achieve the emotional analysis of specific target text. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （487）      PDF（pc） （326KB）（147）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Studies on Military Materia Medica Resources in Western Hunan,China (Ⅲ):Investigation and Analysis of Plant Resources for Treating Snake and Insects Injury LI Zhen, XIAO Meiqi, LI Zhenghui, ZHANG Yangyang, XIANG Xiaomei, CHEN Gongxi Journal of Jishou University(Natural Sciences Edition)    2022, 43 (5): 1-9.   DOI: 10.13438/j.cnki.jdzk.2022.05.001 Abstract （372）      PDF（pc） （902KB）（145）       Knowledge map    Save In order to understand the plant resources for treating snake and insect injuries in western Hunan,the resource library for military mateira medica is constructed.Field sampling survey and literature review were used to comprehensively analyze the military herbal resources of treating snake and insect injuries in western Hunan.The results show that there are 284 species of plants for treating snake and insect injuries in western Hunan,affiliated to 207 genera in 94 families.Living habits are mainly herbaceous,while the habitat is dominated by the forest.Distributed horizontally,plants are more abundant in the northern area than in the southern area.Vertically,species show a trend to increase first and then decrease with the increase of elevation.Among them,military herbs are the most distributed in the altitude range of 600 to 1 299 m.Regional geographical composition is complex and diverse.The families are dominated by a worldwide and pan-tropical distribution,and the genus is dominated by pan-tropical distribution and northern temperate distribution.Species are mainly distributed in East Asia,endemic to China and tropical Asia.The majority are of whole-part medicinal plants for variety of uses,with the right amount of fresh products mashed for the affected place or with right amount of decoction.At present,western Hunan province is rich in the plant resources for the treatment of snake and insect injuries,but the development and utilization is not appropriate,so the development and research should be strengthened for sustainable utilization. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （247）      PDF（pc） （830KB）（142）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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Tunable Dual-Frequency Perfect Absorber with Graphene ZHAO Jinyun, SHAN Xinyu, GAO Guangbo, HUANG Yonggang Journal of Jishou University(Natural Sciences Edition)    2023, 44 (6): 37-43.   DOI: 10.13438/j.cnki.jdzk.2023.06.007 Abstract （94）      PDF（pc） （3283KB）（142）       Knowledge map    Save A tunable dual-frequency perfect absorber consisting of a graphene resonator,a SiO2 dielectric layer and a metal reflector layer has been designed by utilizing the excellent tunable optical properties of graphene.The effects of graphene chemical potential,polarization angle and size on the absorber absorption performance were systematically investigated,and the electric field pattern at the resonance frequency was analyzed to further explain the principle of absorber absorption.The results show that the absorber has an absorption rate of 99.98% and 99.99% at 6.363 and 8.987,respectively.The absorption peak position of the absorber can be effectively adjusted by changing the chemical potential of graphene,and the peak absorption rate can reach more than the peak absorption rate at any polarization angle in the range of 0°~80°.The thickness of the SiO2 dielectric layer has almost no effect on the resonance peak position of this absorber,but it has some effect on the peak absorption rate,which increases and then decreases with the gradual increase of the thickness,and perfect absorption is achieved near the thickness of 3.1 μm.The high absorption rate of this absorber stems mainly from the electromagnetic resonance effect. Reference | Related Articles | Metrics | Comments（0）

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Research Progress of Structure and Function of Nuclear Transcription Factor Relish ZHANG Hong, LIU Qingzhen Journal of Jishou University(Natural Sciences Edition)    2024, 45 (1): 77-83.   DOI: 10.13438/j.cnki.jdzk.2024.01.013 Abstract （105）      PDF（pc） （470KB）（140）       Knowledge map    Save The nuclear transcription factor Relish is a member of the NF-κbs superfamily functioning as an important immune signaling effector.Relish contains a conserved Rel homologue domain at the N-terminal and an ankyrin repeat domain at the C-terminal.Relish is actived in response to certain external stimulations transmitted by the Imd pathway,via phosphorylation,cleavage and other posttranslational modification of Relish.Activated Relish then translocates to nuclear and binds to DNA to regulate the expression of target genes,helping organisms to adapt to various physiological environments and stimuli,resisting the invasion and infection of foreign pathogens.The paper provides an brief review of the structure and function of Relish.The structural features of Relish include Rel homology domain,ankyrin repeats domain,nuclear localization sequence,caspase target site,serine-rich regions,and proline-glutamate-serine-rich domain.Functions of Relish mainly involve participating in innate immunity,regulating neural development and lifespan,regulating intestinal homeostasis and morphology,participating in stress regulation and other physiological activities. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （333）      PDF（pc） （452KB）（139）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）

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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 Abstract （473）      PDF（pc） （414KB）（139）       Knowledge map    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. Reference | Related Articles | Metrics | Comments（0）