Journal of Jishou University(Natural Sciences Edition)

Bounded Φ-Variation Solutions for Retarded Measure Functional Differential Equations

LI Baolin, DING Libo

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 1-7.

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The existence theorem of bounded Φ-variation solution to retarded measure functional differential equations is established by using Kurzweil integral and the function of bounded Φ-variation.

Generic Stability of Differential Inclusions of Linear Polytopes

JI Wei

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 8-11.

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The generic stability of differential inclusions of linear polytopes is studied. Through set-valued analysis, we prove that the differential inclusions of the linear polytopes have generic stability with respect to perturb parts of the right and initial pair of linear polytopes; that is, most of differential inclusions of linear polytopes have essential solution in the Baire category.

New Criterion for the Recursive Determination of Generalized Strictly Diagonally Dominant Matrices

SHI Hui, TUO Qing, WU Le

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 12-19.

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Based on the properties of the generalized strictly diagonally dominant matrices, a new criterion for the recursive determination of generalized strictly diagonally dominant matricesis given by subdividing the set of non-dominant row indicators of the matrix and constructing a new recursive positive diagonal factor.

Error Bound Estimation for Linear Complementarity Problems of B-Matrices

LI Huijun, MO Hongmin, HUANG Jiaxian

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 20-26.

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According to the upper bound of the infinite norm of the inverse matrix of strictly diagonally dominant M-matrix, a new error bound of the solution of the linear complementarity problem of B-matrix is obtained by using the technique of inequality scaling.

Variable Neighborhood Artificial Bee Colony Algorithm to Solve Distribution Center Location Problem

JIANG Ting

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 27-33.

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For the problem of logistics distribution center location，a variable neighborhood artificial bee colony (VNABC) algorithm is presented. In order to ensure the diversity of solutions and enhance the local search ability, the algorithm introduces variable neighborhood search, designs three neighborhood operators and improves the shaking strategy. In order to improve the convergence speed, the global optimum solution is used to replace the current solution in the onlooker bees phase.The simulation experiment results show that the algorithm has reached an effective balance between exploration and exploitation, and it performs well in terms of solution speed and stability.

String Similarity Detection Based on Improved GST Algorithm

SUN Yuyang, OU Yun, FENG Songlyu, ZHOU Kaiqing

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 34-37.

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To reduce the running time and improve the efficiency of string similarity detection， an improved string similarity detection algorithm is proposed utilizing the improved KR algorithm and GST algorithm. Using students' homework source code as the experimental data，the performance of the improved algorithm is tested， and the results show that the improved algorithm can achieve the duplicate check result similar to GST in less fewer comparison times.

Target Recognition and Location Detection Technology of Pipeline Inspection Robot

SONG Leizhen, SUN Xiaodong

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 38-43.

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To solve the problem of low accuracy of pipeline inspection robot in identifying target sludge inside pipeline, an improved YOLO model based on a new learning rate updating strategy was is proposed. The model adopteds deep learning convolutional network to conduct target image learning and training. For the problem of inaccurate location, a distance location model is proposed to achieve accurate location of target distance. Comparative training tests were conducted on YOLO model (Model A) under the new learning rate updating strategy, YOLO model (Model B) under the constant attenuated learning rate updating strategy, YOLO model (Model C) under the exponential attenuated learning rate updating strategy, and YOLO model (Model D) using the traditional gradient descent method. The results showed that the improved YOLO model (Model A) achieved 96.1% accuracy of target detection with location error less than 2 cm.

Numerical Simulation of Flow Characteristics of a DN 1 500 Flue Gas Damper

WANG Zhanfeng, FAN Hua

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 44-49.

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Fluent was used to simulate the flow characteristics of a DN 1 500 flue gas damper. Flue gas mass flows and velocity vector were obtained when the damper pressure drop were 100, 300, 500, 700, 1 000 Pa respectively and the damper opening were 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90° respectively. The influence of pressure drop on flue gas mass flow and flow field were analyzed. Moreover, the piecewise function of flow characteristics corresponding to damper pressure drop of 100 Pa was fitted. The results showed that to have pressure drop less than 100 Pa, the flue gas mass flow with full opening of damper should not exceed 25.05 kg/s. With possible wear, damper should not be operated in narrow angle for long time. It is appropriate to operate the damper in 23°~81° to control the flue gas mass flow.

Superconducting Magnetic Energy Storage Used for Grid Stability in Xiangxi

YANG Yang, CHEN Guangsi, LI Linfeng, WANG Chaoming, LI Xinran, CHEN Changqing, LU Chunjing

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 50-55.

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Xiangxi is the main power source of Hunan Province. The stability of Xiangxi regional power grid is affected by the seasonal hydroelectric power generation and the wind power generation. In order to improve the stability of Xiangxi regional power grid, the superconducting magnetic energy storage (SMES) system is connected to provide real-time and rapid power support to the power grid, so as to solve the instability problem caused by system failure or new energy access. We build an equivalent simplified model in power system analysis software package and simulate the disturbance of the power grid. Then we connect the superconducting magnetic energy storage system in above model, and analyze its positive impact on the stability of the system through the changes of the power angle and voltage of the system.

Practical Path of Cultural Poverty Reduction Assisted by Reading Promotion in Public Libraries in Ethnic Areas:Take Wuling Mountain Ethnic Settlement as an Example

WANG Yue'e, SHI Yanxue, WU Fanglin

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 56-60.

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In the practice of national targeted poverty alleviation strategy, cultural poverty alleviation has become an important means to help poor areas get rid of poverty and become rich. Improving the cultural literacy of poor groups is the premise for them to get rid of economic poverty stably. Reading promotion Library is not only an effective way to improve the people's cultural literacy in poor areas, but also one of the important ways of cultural poverty reduction. Taking the public libraries in Wuling Mountain ethnic settlement as an example, this paper studies the cultural poverty reduction assisted by library reading popularization, analyzes the practical cases and existing problems of the cultural poverty reduction assisted by library reading popularization by using investigation method and case analysis method, and puts forward corresponding countermeasures. It is expected to provide useful reference for the reading promotion of grassroots public libraries in ethnic areas to help consolidate and expand the achievements of poverty alleviation and rural cultural revitalization.

Effect of Propranolol Combined with Amiodarone on Malignant Arrhythmia

BAI Song, ZHAO Dongxian, XU Shanshan, LI Juan, SU Xiaowei, LIU Yan

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 61-64.

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To investigate the effects of propranolol combined with amiodarone on inflammatory factors and QT interval dispersion in patients with malignant arrhythmia. 92 patients with malignant arrhythmia treated in our hospital from February 2018 to June 2020 were randomly divided into two groups with 46 cases in each group. The control group was given amiodarone hydrochloride tablets on the basis of routine treatment, and the observation group was given propranolol hydrochloride tablets on the basis of the control group. The clinical efficacy, inflammatory factors, QT interval dispersion and adverse reactions were compared between the two groups. The results showed that the total effective rate in the observation group was 93.48%, which was higher than 78.26% in the control group (P<0.05). Tumor necrosis factor after treatment α， Interleukin-6, C-reactive protein and QT interval dispersion were lower than those before treatment, but more in the observation group (P<0.05). There were 3 cases of adverse reactions in the control group, which had no significant difference compared with 4 cases in the observation group (P>0.05). It shows that propranolol combined with amiodarone can significantly enhance the clinical efficacy, alleviate inflammatory reaction, reduce QT interval dispersion and have higher safety than amiodarone alone.

Value of US-CNB Histology in the Diagnosis of Early Invasive Lobular Carcinoma of the Breast

YANG Bo, GUAN Jingwen

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 65-69.

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Objective To analyze the value of ultrasound-guided thick needle aspiration (US-CNB) histological examination in the diagnosis of early invasive lobular carcinoma (ILC) of the breast. Methods 169 patients with early breast cancer diagnosed in the breast surgery department of a third-class hospital in Wanbei, Anhui Province between October 2019 and October 2020 were selected as the research objects. Postoperative histopathological results (gold standard): early breast ILC 65 Cases, 104 other early breast cancer patients. All patients underwent ultrasound-guided fine-needle aspiration (US-FNAC) and US-CNB histological examinations before surgery, compared with postoperative pathological examination results, and recorded the value of US-FNAC and US-CNB in the diagnosis of early breast ILC, and all patients Comparison of the positive expression rates of estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor-2 (HER-2) tested by US-CNB. Results US-FNAC diagnosed 46 patients with early breast ILC and 123 other patients with early breast cancer. US-CNB diagnosed early breast ILC in 57 cases and 112 other early breast cancer patients. The sensitivity of US-CNB in diagnosing early breast ILC was 84.65% higher than that of US-FNAC 68.18% (P<0.05), but The accuracy and specificity of the two detection methods were not statistically significant (P>0.05); the positive expression rate of HER-2 in early breast ILC patients was higher than that in other early breast cancer patients (P<0.05), and the positive expression of ER and PR Compared with other early breast cancer patients, the rate was not statistically significant (P>0.05). Conclusion US-CNB histological examination has good sensitivity in diagnosing early breast ILC, and the positive expression rate of HER-2 in patients is high.

Analysis of Consumer Satisfaction of Domestic Brand Sports Goods：Take Li Ning sports goods as an Example

YUAN Han

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 70-74.

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The article aims to explore the relationship between the product characteristics, service quality, brand image and consumer satisfaction of domestic brand sports products. Taking the domestic brand Li Ning sports goods as an example, through questionnaire surveys, the collected data are collected and the samples are analyzed and verified by statistical methods. The study found that: the demographic variables are different in product characteristics, service quality, brand image and consumer satisfaction, and there is no difference between age and product characteristics, service quality, brand image and consumer satisfaction. There are obvious differences between groups; among the various variables of golf age for product characteristics, service quality, brand image and consumer satisfaction, there is a difference between golf age and brand image between 1~5 years and 6~10 years. Obvious inter-group differences; there is no obvious inter-group difference among the variables of monthly income for product characteristics, service quality, brand image and consumer satisfaction. The relationship between product characteristics, service quality, brand image and consumer satisfaction is observed by Pearson's correlation coefficient value. It is found that product characteristics, service quality, and brand image have a significant positive impact on consumer satisfaction. And put forward relevant suggestions, hoping to provide theoretical reference for other domestic brands.

Present Situation and Strategy of Physique Health of Students in Taiyuan Higher Vocational Colleges

LI Yuwen

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 75-77.

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In this paper, based on the relevant data of the national college students' physical health test from 2016 to 2019, the students' physical health in Taiyuan vocational colleges were studied to understand the law and trend of its development and change, and to provide some ideas for the research of physical science. The results show that :(1) the overall physical health level of female students in higher vocational colleges is lower than that of male students, but the physical health of male students has a downward trend. (2) In terms of taking part in physical exercise, boys are significantly higher than girls in terms of time, intensity and frequency. (3) Students' physical health is affected by their lack of good living and exercise habits, uneven distribution of physical education hours, and lack of good venues and equipment in schools.

Talent Cultivation Model of Special Sports Majors in Korea and Implications

ZUO Erfei, YU Ye

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 78-82.

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This study analyzes the special sports majors and talent cultivation model in Korea by using literature method and other methods, and summarizes and distills the main model of Korean special sports majors' talent cultivation. In terms of major settings, special sports majors in Korean universities are divided into teacher-training and non-teacher-training majors, among which, 11 universities have special sports majors, 8 are teacher-training majors and 3 are non-teacher-training majors. In terms of credit setting: teacher-training majors are required to complete 102 credits, and those who pass the grade are directly issued with special physical education teacher's certificate; non-teaching majors can take the certificate of physical education instructor for the disabled and be employed with the certificate. In terms of level settings: sports instructors for the disabled are divided into Level 1 and Level 2 instructor qualifications. The instructor qualification examination procedure includes 3 stages: written examination, interview (skills and expertise), and further study. Based on the above, the experience of Korean special sports personnel training model has positive guiding significance for the improvement of special sports personnel training model in China.

Difference of Physical Fitness of University Students with Different Body Mass Index：Take the freshmen of Fujian Business School as an Example in 2019

YU Rongping

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 83-86.

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The article aims to explore the differences in physical fitness of college students with different body mass indexes. The freshmen of Fujian Business School in 2019 were selected as the research object, and physical fitness tests were conducted during physical education class. The test included body mass index, standing long jump, sitting forward, sit-ups, pull-ups, and endurance running. As for collected data, descriptive statistical analysis is performed and then single-factor variance analysis is applied to compare the differences. The research showed that college students' various physical fitness conditions performed poorly in four aspects: muscle endurance, instantaneous explosive power, and cardiopulmonary endurance. In the matter of body mass indexes, most of the students are at intermediate level, while the number of students who are too light are equivalent to the number of students who are too heavy. And the proportion of students who are too light is significantly more than that of students who too heavy. In the aspect of the difference in healthy fitness of different body mass index levels, At the moment, the moderate students are significantly better than those who are underweight or overweight in the instant explosive force project.The overweight students are significantly worse than those who are underweight and moderate in the cardiopulmonary endurance project. Suggestions are put forward to offer theoretical reference for the design and implementation of future physical education teaching.

Investigation on the Training Path and Influencing Factors of Nursing Students' Professional Skills

QIAN Jun, MU Ju, JIN Hong

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 87-91.

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The training path of professional skills for nursing students is put forward, and the factors which influence the improvement of professional skills are investigated in this paper. The selected nursing students are the research object who have been trained vocationally for six months and accepted the questionnaire investigation to find the influencing factors of professional skills and to provide the foundation for effective training path for nursing students in the process of vocational skill training. The results showed that there was no significant difference in the scores of theoretical knowledge and skills between the two groups before training. The scores of theoretical knowledge and operation skills of the experimental group were higher than those of the control group after vocational skills training, and there was significant difference between the two groups (P<0.05). Univariate analysis showed that the dimensions of role transformation, professional knowledge cognition and patience of nursing students in the experimental group were not affected by obstacles, while those in the control group were more affected by obstacles. The results of single factor Pearson correlation test indicated that the dimensions of role transformation, professional knowledge cognition and patience were significantly correlated with nursing students' professional skills training, and the R value showed a very strong correlation (r=0.967, r=0.942, r=0.911), P<0.05, with statistical significance. Nursing students' vocational skills training path can improve their theoretical knowledge and operational skills. In the process of vocational skills training, we should pay more attention to the influencing factors such as role change, professional knowledge cognition and patience, and formulate a more reasonable and effective vocational skills training path.

Causes and Countermeasures of Psychological Anxiety of Medical College Students Before Examination Analysis on the Phenomenon of "Medical Students Worshipping God Before Examination"

DUAN Lei, HUANG Li

Journal of Jishou University(Natural Sciences Edition), 2021, 42(5): 92-96.

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Psychological anxiety refers to the nervous and uneasy emotional state when facing important upcoming events or dangerous situations. As a negative emotion, it often causes certain obstacles to the physical and mental health of patients. College students have less social and life experience, and often lack certain coping measures when they are faced with academic pressure and life pressure, which leads to emotional failure or error resolution methods. Medical students are more prone to such situations due to higher academic and employment pressure. In recent years, activities similar to feudal superstition have emerged before the examinations in medical colleges and universities, forming a situation where medical students worship God before examinations. We now plan to analyze the phenomenon of "Medical students worshipping gods before examinations" from multiple perspectives, and then find its causes, explore corresponding solutions, and finally formulate effective guidance plans to protect students' learning attitude, correct value orientation, maintain school order, and change school style and discipline on campus.

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