Journal of Jishou University(Natural Sciences Edition)

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Uniform Blow-up and Estimation of Boundary-Layer for Nonlocal Parabolic Equations

LIN Zhiqiang

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 1-9. DOI: 10.13438/j.cnki.jdzk.2021.01.001

Abstract （1806）

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We consider the properties of solutions of reaction-diffusion system ut－Δu=∫Ωuα1dx∫Ωvβ1dx,vt－Δv=∫Ωuα2dx∫Ωvβ2dx, and obtain the uniform blow-up profiles of solutions, and the estimates of boundary layer.

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A Set of Criteria for Nonsingular H-Matrices

WEI Yingying, LUO Biao, MO Hongmin

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 10-15. DOI: 10.13438/j.cnki.jdzk.2021.01.002

Abstract （1641）

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A set of criteria for nonsingular H-matrices are given according to the relationship between α-chain diagonally dominant matrix and nonsingular H-matrix. Their effectiveness is illustrated by numerical examples.

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Error Bounds for Linear Complementarity Problem of B-Matrices

DONG Yingxue, MO Hongmin

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 16-22. DOI: 10.13438/j.cnki.jdzk.2021.01.003

Abstract （1753）

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With the infinite norm range of the inverse matrices of the strictly diagonally dominant M-matrices, the error bounds for linear complementarity problem of B-matrices is studied, and a new estimate of the error bounds is given.

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Stable Total Duality for DC Composite Optimization Problems

YANG Ting, XIE Feifei, FANG Donghui

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 23-28. DOI: 10.13438/j.cnki.jdzk.2021.01.004

Abstract （1705）

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By using subdifferential properties, we introduce two new constraint qualifications, and establish some necessary or sufficient conditions for the total duality and the stable total duality between DC composite optimization problem and its dual problem.

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Mordukhovich Subdifferentials of the Value Function for Parametrized Composite DC Optimization Problems

XIAO Chengfeng, FANG Donghui

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 29-34. DOI: 10.13438/j.cnki.jdzk.2021.01.005

Abstract （1668）

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By using the properties of subdifferentials of function, we introduce a new weaker constraint qualification. Under this constraint qualification, we establish the upper estimates of the Mordukhovich subdifferential of the value function for the parametrized DC composite optimization problems. Then, applications to the conic programming involving DC composite function are given.

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Solving TSP Issue Based on Improved Harmony Algorithm

WU Ying, OU Yun, YAO Xuanshi, DING Lei

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 35-40. DOI: 10.13438/j.cnki.jdzk.2021.01.006

Abstract （1597）

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To improve the convergence speed and accuracy of harmony search (HS) algorithm, a dynamic harmony search algorithm (DHSA) by dynamic adjustment probability mechanism is presented in this paper to settle traveling salesman problem (TSP). In simulation, three classic algorithms, which are genetic algorithm (GA), Harmony Search Algorithm (HSA), and DHSA are selected to verify the feasibility by implementing two TSP data-sets bayg29 and ch150, respectively. The results reveal that the DHSA could obtain the shortest path among these algorithms.

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Research Review of Recurrent Neural Networks

WANG Yuyan, LIAO Bolin, PENG Chen, LI Jun, YIN Yumin

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 41-48. DOI: 10.13438/j.cnki.jdzk.2021.01.007

Abstract （2159）

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Recurrent neural network (RNN) is a kind of neural network with feedback connection in each layer. Because of its storage characteristics, it can process the sequence data which is related before and after input, and can be widely used in the field of text audio, video and so on. But when the input gap is large, RNN has a short-term memory problem, which can not process long input sequences, while long short-term memory (LSTM) can deal with the long-term dependence problem well. Almost all the exciting results based on RNNs have been realized by LSTM since LSTM was proposed, so LSTM has become the focus of deep learning. This review firstly introduces the basic working principle and characteristics of RNN, and then it introduces the principle and characteristics of LSTM and its variants, as well as the application of RNN and LSTM in various fields. Finally, the future research direction of RNN is proposed.

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Performance Analysis of Fifth Order IIR Digital Low-Pass Filter

ZHOU Xuan, WU Yunwen

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 49-53. DOI: 10.13438/j.cnki.jdzk.2021.01.008

Abstract （1824）

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MATLAB software platform is used to study the performance of the fifth order IIR digital low-pass filter designed by bilinear transformation method. The relationship between the order of digital filter and the maximum attenuation of passband, the minimum attenuation of stopband, the corner frequency of passband boundary and the corner frequency of stopband boundary is derived. At the same time, the transition band and stop band of the filter are further analyzed by combining the system function, z-domain analysis and simulation results. Analysis indicates that: the fifth order IIR digital low-pass filter is a stable system, the phase presents delay in the passband and stopband. When the frequency is 0.25π rad/s, the phase state has reverse mutation, and the transmitted signal envelope collapses and enters the transition band. At this time, the phase presents a leading state. When the amplitude response in the stopband decays to 0, the system signal still has phase change, and there is still signal in this frequency band.

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Influence of the Middle Wall on the Mechanical Characteristics of Frame Bridges

WANG Jianxing, LI Zhuoyu, SUN Xueqian, SHI Qingyun

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 54-60. DOI: 10.13438/j.cnki.jdzk.2021.01.009

Abstract （1118）

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This paper takes an actual frame bridge as the engineering background, establishes a model of the bridge under design load, and analyzes the influence of the middle wall on the mechanical characteristics of the frame bridge. Comparative research shows that the extreme values of the top and bottom plates of the frame bridges decrease in vertical displacement, vertical axial force, shear stress; the extreme values of the curvature change and cross-sectional stress of the top plates decrease, while those of the bottom places increase. The research also shows that the vertical displacement of the top plates is most obviously affected by the middle wall and the shear stress of the bottom plates is lest affected by the middle wall.

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Active Earth Pressure Calculation of Retaining Wall with Hoek-Brown Criterion

SUN Wangcheng, ZHANG Daobing, JIANG Jin, YU Biao, YIN Huadong

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 61-65. DOI: 10.13438/j.cnki.jdzk.2021.01.010

Abstract （897）

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Based on the logarithmic spiral failure mechanism of the retaining wall and the nonlinear Hoek-Brown strength criterion, the earth gravity power, internal energy dissipation rate and active earth pressure power of the retaining wall are calculated by the upper limit analysis method. The analytic formula of active earth pressure of the retaining wall is derived based on the virtual power principle, and the optimal upper limit solution of the active earth pressure is solved by Matlab software. The influence of Hoek-Brown strength criterion, retaining wall and soil parameters on the active earth pressure and stability of the retaining wall are analyzed. The results show that with the increase of disturbance factor, wall back angle, retaining wall height, and soil bulk density, the active earth pressure increases nonlinearly, and the stability of the retaining wall decreases. As the geological strength index, rock mass constant, external friction angle, and uniaxial compressive strength increase, the active earth pressure nonlinearly decreases, and the stability of the retaining wall increases.

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Investigation and Exploitation of Edible Medicinal Plant Resources in Xiangxi region, China

CHEN Jiabei, WANG Lu, LIU Jinyuan, DENG Shanshan, HU Die, CHEN Gongxi

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 66-77. DOI: 10.13438/j.cnki.jdzk.2021.01.011

Abstract （1368）

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In order to understand the current situation of medicinal and edible wild plants resources and development and utilization in Xiangxi region. By means of field investigation and literature review, the family composition, living habits, habitat and distribution pattern, function and utilization of medicinal and edible plants in this area were investigated and analyzed. The results showed that there were 57species of medicinal and edible wild plants belonging to 30 families and 52 genera in Xiangxi region. Among them, Liliaceae, Compositae, Gramineae, Lamiaceae and Rosaceae were the dominant quantitative families, Polygonatum, Lilium, Amygdalus and Ziziphus were the dominant quantitative genera. There are 35 herbaceous plants and 23 woody plants, and herbaceous plants are dominant. Among 21 habitats, hillside, cultivated land, forest and roadside are important habitats for medicinal and edible plants in Xiangxi region. In the distribution pattern, the horizontal distribution pattern of the southern and northern regions is basically uniform. The vertical distribution was significantly different, and the medicinal and edible plants were most distributed in the low mountain area. In terms of function and utilization, there are many functions, parts and methods of medicinal and edible plants. Among them, plants with heat-clearing medicinal and edible health care effect are the most. Plants with edible and medicinal stems accounted for the highest proportion. Most plants are decocted for medicine and cooked in soup/porridge. Xiangxi region is rich in medicinal and edible plant resources and has great potential. The protection, comprehensive research, development and utilization of local medicinal and edible plants should be carried out, and corresponding measures should be taken to promote the development of medicinal and edible plant resources in Xiangxi region.

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SWOT Analysis of Building Zhangjiajie into a Developed Cybereconomic Place

DENG Yulu

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 78-82. DOI: 10.13438/j.cnki.jdzk.2021.01.012

Abstract （1769）

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Using the SWOT model, this paper analyzes the advantages, disadvantages, opportunities, and threats of building Zhangjiajie into a developed cybereconomic place. It is found that the advantages of Zhangjiajie include abundant local resources, mature online marketing, and robust policy support. Insurfficient economic development,inadequate functions of the transportation hub are also the threats which Zhangjiajie are facing. The recovery of the tourism market, the development of online economy, and the improvement of transportation and logistics system are the opportunities. The complicated operation and supervision of online economy, the short period of online effects, the lack of online operation talents, and fierce competition in surrounding areas are threats. In order to further cultivate and develop cyber economy, the city of Zhangjiajie must exploit the potential of products for online marketing and activate the online marketing efficiency; strengthen the reservior of talents and enhance competitiveness; build a sophisticated regulatory mechanism to avoid regulatory absence; strengthen maintenance system, and consolidate the foundation for development.

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Research Progress in the Relationship Between Intestinal Flora and Its Metabolites and Psycho-Cardiology

XUE Bingqing, LI Chunyan, ZHU Can

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 83-89. DOI: 10.13438/j.cnki.jdzk.2021.01.013

Abstract （1151）

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Psycho-cardiology refers to cardiovascular disease with mental illness which is attracted growing attention with medical development. In the previous treatment of cardiovascular disease, doctors focused more on organic cardiopathy than on psychological disease of patients. Numerous studies have shown that intestinal flora and its metabolites played a vital role not only in cardiovascular disease, but also in mental and psychological diseases. This article summarizes the influences and mechanism of intestinal flora and its metabolites in the outbreak and development of psycho-cardiology, as well as the potential value in the prevention and treatment of psycho-cardiology to offer new insights into the prevention and treatment of ppsycho-cardiology.

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Advances in diagnosis and treatment of uterine scar pregnancy after cesarean section

HUANG Liying, ZHANG Yuhua, LIN Tong

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (1): 90-96. DOI: 10.13438/j.cnki.jdzk.2021.01.014

Abstract （1156）

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

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Some Notes of D_C-Projective Modules

HE Donglin, FAN Liang

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 1-4. DOI: 10.13438/j.cnki.jdzk.2021.02.001

Abstract （542）

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With methods of homological algebra, some properties of Ding-projective modules with respect to a semidualizing module C are investigated, and relationships between related classes of modules are given. It is proved that PC(R) is an injective cogenerator of DPC(R), where DPC(R) denotes the class of all DC-projective R-modules, and PC(R) denotes the class of all R-modules CRP with P projective module.

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Oscillation of Third Order Semi-Linear Neutral Differential Equations

JIA Duihong

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 5-11. DOI: 10.13438/j.cnki.jdzk.2021.02.002

Abstract （609）

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By using Riccati transformation and Philos type integral technique to construct different functions, some new oscillation criteria of the third order semi-linear neutral differential equation are established.

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Third Order Hankel Determinant for the Inverse of Starlike and Convex Functions

SONG Yuan

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 12-19. DOI: 10.13438/j.cnki.jdzk.2021.02.003

Abstract （740）

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Let S* be the class of functions f univalent in the unit disk Δ={z:|z|<1} such that Re zf′(z)〖〗f(z)>0 (z∈Δ) and let K be the class of functions f univalent in the unit disk Δ={z:|z|<1} such that Re (1+zf″(z)〖〗f′(z))>0 (z∈Δ). Using Toeplitz determinant, we obtian the upper bound of the third order Hankel determinants for the inverse functions of f∈S* and f∈K.

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Fixed Point Theorems of Compatible Mappings in Cone b-Metric Spaces

PENG Rong, CHAI Fujie

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 20-25. DOI: 10.13438/j.cnki.jdzk.2021.02.004

Abstract （635）

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In this paper, common fixed point problem of four generalized contractive mappings in a complete cone b-metric spaces is studied. A monotonic iterative sequence is constructed and existence and uniqueness theorems of several common fixed points are proved with the iterative method and the compatibility of mappings, which generalizes relative results in cone metric spaces and b-metric spaces.

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New Lower Bound of Wrap-Around L₂-Discrepancy for Mixed Two- and Three-Level Designs

WANG Zhiqing, LUO Biao, OU Zujun

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 26-30. DOI: 10.13438/j.cnki.jdzk.2021.02.005

Abstract （600）

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In this paper, the uniformity of mixed two- and three-level designs measured by wrap-around L₂-discrepancy is discussed, and a new lower bound of wrap-around L₂-discrepancy is provided.

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New Estimate of Error Bounds for Linear Complementarity Problems of B^S-Matrices

ZHOU Cuiling, MO Hongmin

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 31-37. DOI: 10.13438/j.cnki.jdzk.2021.02.006

Abstract （801）

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According to the special structure and properties of BS-matrices, new error bounds for the linear complementarity problem of B^S-matrices is improved by using the infinite norm range of inverse of a strictly diagonally dominant M-matrix and the scaling technique ofinequality. The validity of the new estimate is verified by theoretical analysis and numerical example.

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Quantum Network Monitoring Based on Teleportation

HUANG Shangjiang, ZHOU Xiaoqing, HU Xiaohuan, LUO Weidong

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 38-44. DOI: 10.13438/j.cnki.jdzk.2021.02.007

Abstract （707）

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Based on the characteristics of teleportation and classical information transmission, the transmission process of multi-pair entangled particle invisible state transfer network is designed with both sides of communication as the research object.To ensure that the transmission is reliable, a quantum cloning machine is used to copy and backup the quantum states, and then the information is transmitted. Considering that the third party cannot directly monitor the quantum information in the quantum channel, a method for the third party to calculate the number of data frame bits in the data link layer and a method to receive IP datagrams in the network layer is designed to indirectly realize the monitoring of the user, while solving the problem of user monitoring by the NSA for the information transmission security and the problem of charging by the telecommunication company for the user's communication time and communication traffic.

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Implementation of Fish Eye Image Correction Based on Bicubic Interpolation

ZENG Qingli, HONG Zhiwei, DING Lei

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 45-49. DOI: 10.13438/j.cnki.jdzk.2021.02.008

Abstract （806）

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firstly, the parameters of fisheye lens imaging model are calibrated by the calibration board, specific fisheye lens image distortion correction model is established, and then the fisheye image is corrected by using the model. Secondly, the non feature points are interpolated by bicubic interpolation method, and good correction effect is achieved. Bicubic interpolation algorithm can solve the problem of image distortion caused by fish eye lens, and has a good application prospect in the field of vision navigation and monitoring.The main research steps are as follows: (1) calibrate the fisheye image with a self-made planar calibration plate; (2) restore the distorted fisheye image to the perspective image satisfying the visual effect of human eyes by using the calibrated lens distortion parameters.

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Design of High Precision DMCS Drilling Machine

ZHANG Xing, CHEN Hanhan, XU Weixiong, CAO Jin, WU Liming

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 50-55. DOI: 10.13438/j.cnki.jdzk.2021.02.009

Abstract （606）

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In order to achieve accurate positioning of drilling and milling, the movement of drill bit is monitored and corrected in real time with the help of frequency converter, servo driver and the use of grating ruler. At the same time, the continuous trajectory interpolation movement can be realized through the DMCS control system, so as to drill and remove chips for large area of materials. That can realize the automatic drilling and tapping of a large number of small holes in soft materials.

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Design of Multifunctional Desk Lamp Control System Based on Bluetooth

TAO Zengjie, YUAN Keke, LI Shiyou, FU Dingyuan

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 56-60. DOI: 10.13438/j.cnki.jdzk.2021.02.010

Abstract （928）

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A multifunctional desk lamp control system based on bluetooth is designed. First, the light sensor detects the intensity of light. The infrared sensor detects the person. The ultrasonic sensor detects the distance between the person and the lamp. These signals are transmitted to the microcontroller unit which compares the detected signals with the set values. It analyzes the signals to determine whether the light is on or off, adjusts the brightness and gives an alarm. At the same time, the corresponding parameters are displayed on the OLED and the bluetooth terminal. The terminal can also control the desk lamp. Through on-line testing with bluetooth, the system is powerful and stable.

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Hemiboea gracilis Franch. var. guixiensis: A New Variety of Gesneriaceae from Hunan,China

TAN Lu, XIANG Xiaomei, LIU Bing, CHEN Gongxi

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 61-64. DOI: 10.13438/j.cnki.jdzk.2021.02.011

Abstract （748）

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A new variety of Gesneriaceae, Hemiboea gracilis Franch. var. guixiensis G. X. Chen, X.M.Xiang et L. T var. nov. from Hunan Province of China is described. The new variety is similar to the typical variety (Hemiboea gracilis Franch.) in morphology. But further observation showed that the new varietystems is sparsely pilose, leaf sides and petiole are densely bristly, except the inside of the flower, the rest is densely pilose, the fruit tips are sparsely pilose. Therefore, they are easy to distinguish.

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Classification Standard for One-Year Seedling of Phellodendron chinense

LIU Nianyuan, ZHONG Qingshan, XIANG Zuheng, PENG Xianfeng, ZENG Huijie, XIANG Hua, XIANG Ming, XIANG Caihai, HUANG Zhengming

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 65-71. DOI: 10.13438/j.cnki.jdzk.2021.02.012

Abstract （828）

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Aiming to instruct the field management and to push the normalization and standardization of Phellodendron chinense Schneid seedling cultivation, the critical values for classification of 1 year’s old Phellodendron chinense Schneid seedlings were determined using materials of 2 564 plants in 72 sample plots with 1 m×1 m size in Dan township, Longshan county, Hunan province according to quality indexes of ground diameter (D) and height (H) of seedling with K-average value clustering method and standard deviation method. The comprehensive evaluation result was as fellows, the standard for class Ⅰ seedling was D≥1 cm and seedling H≥100 cm, and class Ⅱ seedling was 0.6～＜1 cm for D, and 60～＜100 cm for seedling H, and class Ⅲ seedling was D＜0.6 cm and seedling H＜60 cm. According to this standard, the proportion of class Ⅰ and class Ⅱ of Phellodendron chinense is 64.8%.

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Community Residents' Perception of Rural Tourism Impact in Wuling Mountain Tourist Resort, Fuling, Chongqing

TAN Shuyue, TANG Shashan

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 72-78. DOI: 10.13438/j.cnki.jdzk.2021.02.013

Abstract （672）

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This paper makes a sample survey on the community residents of Wuling Mountain Tourist Resort in Fuling District of Chongqing, and probes into their perception of tourism impact in terms of economic, cultural, social, and environmental aspects. The results show that community residents think that the positive demonstration effect of tourism development is obvious, and the advantages of tourism development outweigh the disadvantages; the residents with different demographic characteristics have different perceptions and attitudes of impact, especially the residents with different education degrees; a small number of residents whose family environment has changed can not adapt to the new production and living environment. It is suggested that we should further improve the educational degrees of residents while developing tourism, and pay attention to improving the production and living environment of residents.

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Tourism Perceived Image of Characteristic Villages Based on Network Text Analysis：Take Wuling Mountain Area in Hunan Province

CHEN Le, XIAO Lulu

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 79-84. DOI: 10.13438/j.cnki.jdzk.2021.02.014

Abstract （759）

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The tourism image of characteristic villages is an important basis to test and measure the tourism destination of characteristic villages. Taking Wuling Mountain Area in Hunan Province as an example, this paper uses Python web crawler technology to obtain travel notes and comments from websites such as wasp nest and Ctrip, and uses Rost content mining software to analyze the text with high-frequency feature words, semantic network and emotion, so as to study the tourists' perception of the tourism image of the scenic spot.The research conclusions are as follows: (1) 162 high-frequency words are extracted from 128 travel notes, and the words ranked in the top 60 indicate that tourists focus on "village landscape", the semantic network matrix of high-frequency words takes the village as the core, and other characteristic words diverge around; (2) Tourists' cognitive image of characteristic village tourism mainly includes village image, tourism attractions, village facilities and services; (3) Tourists' perception of the village tourism image in Wuling Mountain Area of Hunan Province is mainly positive emotion, and the negative emotion mainly comes from the imperfection of the village's road traffic, health environment and other infrastructure.

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Experimental Research on Mathematics Preparation Test Teaching in College Entrance Examination Based on Mathematics Expression Ability Training

LIANG Yongding, LIU Yongzhong, LI Qisheng

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 85-91. DOI: 10.13438/j.cnki.jdzk.2021.02.015

Abstract （714）

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It uses literature analysis, interview, observation and other research methods to analyse mathematical expression ability of high school students, constructs the teaching model of mathematical expression ability which is studied in the college entrance examination review. The results show that the college entrance examination mathematics review based on the cultivate of mathematical expression ability can improve review quality by promoting the enhancement in students' school record, strengthen students' learning interest and initiative.

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Problems and Countermeasures of Educational Data Governance in Colleges and Universities

PU Tianyin, RAO Zhengchan, LEI Hong

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (2): 92-96. DOI: 10.13438/j.cnki.jdzk.2021.02.016

Abstract （803）

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Based on the dilemma of the practice of university education data, this paper discusses the overview of data governance, the necessity of data governance, the problems of university data, the classification of university education data and governance strategies, and puts forward four measures: building a scientific governance mechanism, building a unified data standard system, regularly filtering data, and mastering the key links of data governance.

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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 （1901）

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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.

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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 （754）

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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.

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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 （860）

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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.

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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 （985）

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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.

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Watermarking Algorithm Based on 3D Wheelbase

TANG Han, CHEN Liuyang, LU Rongbo

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (3): 29-33. DOI: 10.13438/j.cnki.jdzk.2021.03.005

Abstract （688）

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In order to obtain watermarking with superior robustness and invisibility, a watermarking algorithm based on 3D wheelbase is proposed. Firstly, the watermark image is encrypted by calculating the encryption technology of ghost imaging, then the 3D wheelbase of the image is defined on the basis of 3D histogram, and the set of all pixel points when the wheelbase is maximum is obtained. Finally, the best point in this set is found as the embedding position of the watermark through particle swarm optimization algorithm. Simulation experiments of robustness and invisibility show the effectiveness of the proposed algorithm.

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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 （511）

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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.

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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 （3355）

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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.

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Analysis of Special Structure of Song-Style Second Grade Dovetail Tenon

WANG Jianxing, GAO Ruxin, YANG Duan, HE Jiaxin

Journal of Jishou University(Natural Sciences Edition) 2021, 42 (3): 45-51. DOI: 10.13438/j.cnki.jdzk.2021.03.008

Abstract （613）

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To better analyze the mechanical properties of the dovetail tenon structure, a twofold line multi-parametric mechanical structure was established, and a mechanical analysis test suitable for wooden structures was carried out. Then, the corresponding dovetail joints were proposed based on the mechanical balance and a deformation coordination relationship formula. The above research results show that the deformation of the dovetail tenon is mainly concentrated around the contact between the tenon and mouth. When the unidirectional load becomes larger, its bending moment also becomes larger, which is easy to cause damage to the contact surface. The load-displacement curve and the ultimate load-vertical load curve obtained through the test also show that when the vertical load increases, the ultimate load also increases; when the ultimate load reaches the yield critical point, the increase in displacement becomes smaller and tends to be smooth.

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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 （779）

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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.

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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 （614）

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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.

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