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2. Proceedings of International Conference on Humanities, Social and Education Sciences (iHSES) (Washington, District of Columbia, July 15-19, 2020). Volume 1
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International Society for Technology, Education and Science (ISTES) Organization, Thripp, Richard, Sahin, Ismail, Thripp, Richard, Sahin, Ismail, and International Society for Technology, Education and Science (ISTES) Organization
- Abstract
"Proceedings of International Conference on Humanities, Social and Education Sciences" includes full papers presented at the International Conference on Humanities, Social and Education Sciences (iHSES), which took place on July 15-19, 2020, in Washington, D.C. The aim of the conference is to offer opportunities to share ideas, to discuss theoretical and practical issues, and to connect with the leaders in the fields of "humanities," "education," and "social sciences." The conference is organized annually by the International Society for Technology, Education, and Science (ISTES). The iHSES invites submissions which address the theory, research, or applications in all disciplines of humanities, education, and social sciences. The iHSES is organized for: (1) faculty members in all disciplines of humanities, education, and social sciences; (2) graduate students; (3) K-12 administrators; (4) teachers; (5) principals; and (6) all interested in education and social sciences. [Individual papers are indexed in ERIC.]
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- 2020
3. Mathematicians', Mathematics Educators', and Mathematics Teachers' Professional Conceptions of the School Learning of Mathematical Modelling in China
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Xu, Binyan, Lu, Xiaoli, Yang, Xinrong, and Bao, Jiansheng
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Mathematical modelling has been included in many mathematics curricula worldwide, and China's curricula are no exception. The development of modelling competencies has recently been listed among the Chinese mathematics curriculum's six key objectives. However, the manner in which nationwide learning and teaching of modelling should be conducted presents a key challenge to China's schools, most of which are wholly lacking in experience of this practice. In this study we present a thematic analysis of the conceptions of four mathematicians, five mathematics educators and seven mathematics teachers, with regard to the learning and teaching of modelling. The results show that the participants' views of modelling can be categorised and linked to the following theoretical perspectives of modelling: applied, epistemological, educational, pedagogical and conceptual perspectives. Interestingly, the mathematicians and mathematics educators tended towards the atomistic approach to the learning and teaching of modelling, while the mathematics teachers placed greater emphasis on the holistic approach. The mathematicians and mathematics educators stressed student autonomy, while the teachers emphasised teacher demonstration. All participants considered group work to be an appropriate means of conducting modelling learning and teaching. Additionally, some teachers were concerned that modelling could not be incorporated into mathematical teaching and learning if it could not be included in high-stakes examinations. The paper concludes with a discussion on the rationale behind the existence of the various conceptions and the potential insights that may be drawn from these conceptions.
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- 2022
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4. Education's Role in Preparing Globally Competent Citizens. BCES Conference Books, Volume 12
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Bulgarian Comparative Education Society (BCES), Popov, Nikolay, Wolhuter, Charl, Ermenc, Klara Skubic, Hilton, Gillian,, Ogunleye, James, Chigisheva, Oksana, Popov, Nikolay, Wolhuter, Charl, Ermenc, Klara Skubic, Hilton, Gillian,, Ogunleye, James, Chigisheva, Oksana, and Bulgarian Comparative Education Society (BCES)
- Abstract
This volume contains papers submitted to the 12th Annual International Conference of the Bulgarian Comparative Education Society (BCES), held in Sofia and Nessebar, Bulgaria, in June 2014, and papers submitted to the 2nd International Partner Conference, organized by the International Research Centre 'Scientific Cooperation,' Rostov-on-Don, Russia. The volume also includes papers submitted to the International Symposium on Comparative Sciences, organized by the Bulgarian Comparative Education Society in Sofia, in October 2013. The 12th BCES Conference theme is "Education's Role in Preparing Globally Competent Citizens." The 2nd Partner Conference theme is "Contemporary Science and Education: New Challenges -- New Decisions." The book consists of 103 papers, written by 167 authors and co-authors, and grouped into 7 parts. Parts 1-4 comprise papers submitted to the 12th BCES Conference, and Parts 5-7 comprise papers submitted to the 2nd Partner Conference. The 103 papers are divided into the following parts: (1) Comparative Education & History of Education; (2) Pre-service and In-service Teacher Training & Learning and Teaching Styles; (3) Education Policy, Reforms and School Leadership; (4) Higher Education, Lifelong Learning and Social Inclusion; (5) Educational Development Strategies in Different Countries and Regions of the World: National, Regional and Global Levels; (6) Key Directions and Characteristics of Research Organization in Contemporary World; and (7) International Scientific and Educational Cooperation for the Solution of Contemporary Global Issues: From Global Competition to World Integration.
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- 2014
5. Can Mathematical Modelling Work as a Creativity-Demanding Activity? An Empirical Study in China
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Lu, Xiaoli and Kaiser, Gabriele
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Creativity has been identified as a key characteristic that allows students to adapt smoothly to rapid societal and economic changes in the real world. However, Chinese students appear to perform less well in mathematical problem-solving and problem-posing abilities, which are strongly connected to mathematical creativity. Mathematical modelling has recently been introduced as one of the six core competencies in the Chinese mathematical curriculum and is built on students' ability to solve real-world problems using mathematical means. As mathematical modelling is characterised by openness regarding the understanding of complex real-world problems and the complex relationship between the real world and mathematics, for the strengthening of creativity, mathematical modelling activities seem to be adequate to accomplish this purpose. In this paper, we describe a study with 71 upper secondary school students, 50 pre-service mathematics teachers, and 66 in-service mathematics teachers, based on an extended didactical framework regarding mathematical modelling as a creativity-demanding activity. The results of the study indicate a significant correlation between modelling competencies and creativity aspects. Especially significant correlations between the adequacy of the modelling approaches and the two creativity aspects of usefulness and fluency could be identified, as well as a significant negative correlation between usefulness and originality. The results of the correlational analysis of relationships among the four criteria were not always consistent in the three participant groups. Overall, the results have implications for the promotion of creativity for various expertise groups and demonstrate the dependency of the modelling activities on the mathematical knowledge of the participants and the mathematical topic with which they are dealing.
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- 2022
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6. Pre-Service Mathematics Teachers' Professional Modeling Competencies: A Comparative Study between Germany, Mainland China, and Hong Kong
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Yang, Xinrong, Schwarz, Björn, and Leung, Issic K. C.
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Although mathematical modeling plays an important role in many curricula worldwide, significant discrepancies persist in the importance of mathematical modeling in ordinary mathematics classrooms and teacher education. This paper compares pre-service mathematics teachers' professional mathematical modeling competencies in three different regions--Germany, Mainland China, and Hong Kong--where educational and cultural traditions differ, including the role of mathematical modeling. In total, 232 pre-service mathematics teachers from the three regions completed a modeling task covering mathematics content knowledge (MCK) of modeling and mathematical pedagogical content knowledge (MPCK) of modeling. The results show that pre-service teachers from Germany demonstrated the strongest MCK and MPCK of mathematical modeling; by contrast, pre-service mathematics teachers from Mainland China and Hong Kong demonstrated relatively weaker MCK and MPCK of mathematical modeling. MCK and MPCK of mathematical modeling were also found to be unevenly developed at different competence levels for the three regions. These differences may be attributed to the history of mathematical modeling in mathematics curricula, teacher education, and teaching culture in these three regions.
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- 2022
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7. Creativity in Students' Modelling Competencies: Conceptualisation and Measurement
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Lu, Xiaoli and Kaiser, Gabriele
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Modelling competencies are currently included in numerous curricula worldwide and are generally accepted as a complex, process-oriented construct. Therefore, effective measurement should include multiple dimensions, like the sub-competencies required throughout the modelling process. Departing from the characteristics of modelling problems as open and often underdetermined real-world problems, we propose to enrich the current conceptualisation of mathematical modelling competencies by including creativity, which plays an important role in numerous phases of the mathematical modelling process but has scarcely been considered in modelling discourse. In the study described in this paper, a new instrument for the evaluation of this enriched construct has been developed and implemented. The modelling competencies incorporating creativity of the students were evaluated based on the adequacy of the models and the modelling processes proposed, and the appropriateness and completeness of the approaches were evaluated in detail. Adapting measurement approaches for creativity that have been developed in the problem-solving discourse, certain criteria of creativity were selected to evaluate the creativity of the students' approaches in tackling modelling problems--namely, usefulness, fluency, and originality. The empirical study was conducted among 107 Chinese students at the upper secondary school level, who attended a modelling camp and independently solved three complex modelling problems. The results reveal significant correlations between fluency and originality in students' performances across all tasks; however, the relationships between usefulness and the other two creativity aspects were not consistent. Overall, the results of the study support the importance of the inclusion of creativity in the construct of modelling competencies.
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- 2022
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8. The Verhulst Model with Remedy and Its Application in Forecasting Quantity of Student Taking Entrance Examination to College
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Liu, Bin and Bi, Qing-sheng
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The Verhulst model can be used to forecast the sequence, which is characterized as non-monotone and fluctuant sequence or saturated S-form sequence. According to the situation of national enrollment scale of college, this paper forecasts the quantity of students taking entrance examination to college with a Verhulst model with remedy based on data mining theories, and by the above model, some countermeasures are developed to the higher education of Henan province in China. (Contains 3 tables and 2 figures.) [This paper was partly supported by Financial Program for Core Teacher of Henan's University.]
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- 2010
9. A Multilevel Comprehensive Assessment of International Accreditation for Business Programmes-Based on AMBA Accreditation of GDUFS
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Jiang, Yong
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Traditional mathematical methods built around exactitude have limitations when applied to the processing of educational information, due to their uncertainty and imperfection. Alternative mathematical methods, such as grey system theory, have been widely applied in processing incomplete information systems and have proven effective in a number of fields. In this study, an assessment indicator system is developed, based on the MBA programme of Guangdong University of Foreign Studies (GDUFS), through statistics building on the initial indicators of the Association of MBA's assessment system for MBA programmes. The proposed system assesses the accredited indicators of the GDUFS' MBA programme using grey comprehensive evaluation methodology. The results accord with the actual situation, supporting the accuracy of the assessment model, research theory and methodology. In addition, this paper analyses and sorts degrees of satisfaction for programme indicators, with the adoption of the grey correlation analysis method, to provide a basis for decision-making.
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- 2017
10. Constructing Meanings of Mathematical Registers Using Metaphorical Reasoning and Models
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Lai, Mun Yee
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Current debates about successful mathematics pedagogy suggest that mathematical learning and problem solving can be enhanced by using metaphors as they provide students with a tool for thinking. But assisting pre-service teachers to understand the importance of careful and accurate explanations for mathematical concepts remains an issue. This paper investigates how a mathematics teacher made use of models and metaphors to construct mathematical meanings within a transformational shift between less- and more-mathematical language. The Peircian model of semiosis was employed to identify the conceptual relationships in the metaphors and to analyse possible discrepancies between the literal meaning of metaphors, the teacher's intended meaning and the targeted mathematical concepts. The findings indicate that the syntactic, semantic, and pragmatic features of the language used in mathematics teaching play a significant role in student learning. Teachers' knowledge of students' prior understanding of mathematical meaning of related concepts and their knowledge of examples, models, and language that are pedagogically preferable jointly affect the quality of teaching.
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- 2013
11. Proceedings of the Invitational Conference on Testing Problems (25th, New York, New York, October 31, 1964).
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Educational Testing Service, Princeton, NJ.
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This conference focuses upon various aspects of testing within a society, and upon technical advances in measurement. Philip H. DuBois's paper deals with China, a society dominated by tests, from 1115 BC--1905 AD. Donald W. Fiske discusses the effect of testing on the individual in modern America in his paper, "The Subject Looks at Psychological Tests." Three psychometricians discuss several new mathematical approaches to the analysis of test data: Louis Guttman, "The Structure of Interrelations Among Intelligence Tests;" Henry F. Kaiser, "Psychometric Approaches to Factor Analysis;" and Ledyard R Tucker, "Experiments in Multi-Mode Factor Analysis." Omar Khayyam Moore speaks on "Technology and Behavior." The four final papers dealt with various issues related to the testing of the culturally different: "Measurement Issues in the Counseling of the Culturally Disadvantaged," Martin Hamburger; "Principles of Developing Tests for the Culturally Different," William E. Coffman; "The Measurement of Environments," Richard Wolf; and "Social Class and Cultural Group Differences in Diverse Mental Abilities," Gordon Fifer. (BH)
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- 1964
12. Principal Component Clustering Approach to Teaching Quality Discriminant Analysis
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Xian, Sidong, Xia, Haibo, Yin, Yubo, Zhai, Zhansheng, and Shang, Yan
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Teaching quality is the lifeline of the higher education. Many universities have made some effective achievement about evaluating the teaching quality. In this paper, we establish the Students' evaluation of teaching (SET) discriminant analysis model and algorithm based on principal component clustering analysis. Additionally, we classify the SET by clustering the result of extracting the indexes through the principal component analysis (PCA), then we also test the rationality of the rating using Fisher's discriminant function. Finally, the model and algorithm are proved to be effective and objective according to the empirical analysis.
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- 2016
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13. Multi-objective optimisation of high-speed rail profile with small radius curve based on NSGA-II Algorithm.
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Li, Guofang, Li, Xing, Li, Meng, Na, Tong, Wu, Shaopei, and Ding, Wangcai
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MECHANICAL wear , *THEORY of distributions (Functional analysis) , *ALGORITHMS , *PARETO optimum , *HIGH speed trains , *MATHEMATICAL models , *RADIUS (Geometry) - Abstract
The multi-objective optimisation of high-speed rail profile with small radius curve is studied in the paper. A multi-objective mathematical model for rail profile optimisation of high-speed railway is established. The CN60 rail profile is parameterised into a series of generalised functions of design variables. In order to guarantee the smoothness of the rail profile and meet the maximum grinding depth of rail in China, the constraints are employed. The wheel-rail vertical clearance and equivalent conicity of wheelset are taken as objective functions, and a rail wear prediction programme is compiled. Contact line method is employed to complete the detection algorithm of wheel-rail contact points. Finally, NSGA-II Algorithm is adopted to solve the Pareto-optimal front of the optimisation model. A set of solutions are retrieved from the Pareto optimal front solution as the optimised profile. The optimised rail profile and the original rail profile are matched with the LMA wheel profile (a certain worn type of wheel profiles for EMU in China) respectively. It is testified that the rail profile could effectively reduce the rail wear and improve curving performance. The new method proposed in this paper can provide some reference for the optimisation design of high-speed rail profile with small radius curve. [ABSTRACT FROM AUTHOR]
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- 2023
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14. Summer Camp of Mathematical Modeling in China
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Tian, Xiaoxi and Xie, Jinxing
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The Summer Camp of Mathematical Modeling in China is a recently created experience designed to further Chinese students' academic pursuits in mathematical modeling. Students are given more than three months to research on a mathematical modeling project. Researchers and teams with outstanding projects are invited to the Summer Camp to present their findings and techniques. These projects are based on real-world problems and train students to apply their mathematical knowledge into practice. Students communicate their research ideas with experts, peers, and practitioners of relevant fields during the weeklong Camp. This paper will illustrate the Summer Camp of Mathematical Modeling's origin and motivation, organizational structure, development, sponsorships, and activities and modeling tasks.
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- 2013
15. Division of Housework and Women's Fertility Willingness.
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Zhang, Cheng, Liang, Yanan, and Qi, Xiaoyu
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FERTILITY , *FAMILY conflict , *SATISFACTION , *WORK-life balance , *PSYCHOLOGY of women , *DESCRIPTIVE statistics , *GENDER inequality , *HOUSEKEEPING , *MATHEMATICAL models , *FERTILITY preservation , *THEORY , *QUALITY assurance , *REGRESSION analysis - Abstract
Low fertility willingness has become a major practical reality in China. From the perspective of family gender equality, this paper analyzes the impact of division of housework on women's fertility willingness by using the data of China Family Panel Studies (CFPS). The results of propensity score matching method and instrumental variable method show that husbands' participation in housework can effectively improve wives' fertility willingness. Mechanism analysis shows that husbands' active participation in housework can effectively reduce wives' work–family conflict, increase wives' satisfaction with husbands' housework contribution, and help improve wives' happiness and fertility willingness. Further discussion on whether families have had children or not shows that women who have had children are more sensitive to their husbands' participation in housework. This study provides empirical evidence for the applicability of family gender equality theory in China and the factors affecting women's fertility willingness. [ABSTRACT FROM AUTHOR]
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- 2024
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16. An Analysis of the Influence of Construct Parameters on the Solar Radiation Input in an Insulated Plastic Greenhouse.
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Tian, Dongkun, Li, Yanfeng, Zhao, Shumei, Wu, Qinan, Ma, Chengwei, and Song, Weitang
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GREENHOUSES , *SOLAR radiation , *PLASTICS , *AZIMUTH , *MATHEMATICAL models - Abstract
Insulated plastic greenhouses (IPG) were a new type of facility emerging in production in China. The mechanism of construct parameters on the indoor solar radiation deserves further study. A mathematical model that can well describe the spatial and temporal distribution of solar radiation in the greenhouse was established. Based on this model, the effects of multiple construct parameters, such as insulation blanket shading, height–span ratio, greenhouse azimuth, and geographical latitude, on the indoor solar radiation of IPG were quantitatively specified. The results showed that the spatial and temporal distribution of inside solar radiation was highly variable along the span direction of IPG. And by analyzing the simulation data, it was found that for different heights of greenhouses, the corresponding optimal span is different. Therefore, in the construction of greenhouses, the appropriate height–span ratio should be selected according to the planting demand. And by simulating the inside solar radiation under different greenhouse azimuth angles, it was found that accumulated daily solar radiation in the greenhouse reaches the optimum value when the greenhouse azimuth angle is in the range of 0–20°. This paper can provide theoretical guidance for the design and optimization of structure parameters of IPG in China. [ABSTRACT FROM AUTHOR]
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- 2024
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17. Ethical value and challenges of long-term care insurance.
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Yucen, Weng and Min, Chen
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EVALUATION of human services programs , *HEALTH policy , *SOCIAL groups , *ETHICS , *MATHEMATICAL models , *RURAL conditions , *PUBLIC health , *LONG-term care insurance , *RESEARCH funding , *THEORY , *NURSES , *EMPLOYEES' workload , *POLICY sciences , *METROPOLITAN areas , *ELDER care - Abstract
Background: Issues of the aging population and disability of older persons have been rapidly developing in China over the past 20 years. Since 2016, the Chinese government has been exploring remedies to alleviate social and family burdens and ensure the dignity of the disabled old persons by implementing long-term care insurance systems in a few pilot cities across the country. Purpose: The purpose of this study is to present the current challenges faced by China's long-term care insurance system and put forth suggestions for the future, based on literature research and the feedback obtained from its implementation in pilot areas. Research Design: This paper conducts a theoretical study based on the principles of public health ethics. Study Sample: Since 2016, China has launched two batches of pilot cities for long-term care insurance. The analysis object of this study is the feedback on the policy implementation of the existing 29 pilot cities that participated. The relevant data involved in the analysis are from the authors' field research and published literature on the analysis of pilot cities. Analysis: The ethical value and importance of long-term care insurance policies in China are evaluated from the perspectives of policy philosophy and social individual interests. Results: The results of this evaluation show that the core ethical values were not met in the development of China's current long-term care insurance system. Moreover, distributive justice norms were neglected, and access to the system between different social groups and within the groups covered by it was unequal. Conclusions: This paper argues that long-term care insurance should not differentiate between urban and rural areas in allocating nursing resources. Additionally, it would be essential to build democratic supervision and manage public opinions by adopting open and transparent information-sharing policies. Standards of disability assessments and treatment payment should be at par to ensure a balance between the rights and obligations of policyholders. [ABSTRACT FROM AUTHOR]
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- 2023
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18. Methodology and results of cost-effectiveness of LDL-C lowering with evolocumab in patients with acute myocardial infarction in China.
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Wan, Yuansheng, Liu, Jinyu, Zhan, Xiaolian, Zhang, Yu, and You, Ruxu
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THERAPEUTIC use of monoclonal antibodies , *STATINS (Cardiovascular agents) , *EVALUATION of medical care , *DRUG efficacy , *CAUSES of death , *COMBINATION drug therapy , *CONFIDENCE intervals , *STROKE , *MATHEMATICAL models , *MAJOR adverse cardiovascular events , *ATORVASTATIN , *HYPERCHOLESTEREMIA , *LDL cholesterol , *MYOCARDIAL infarction , *MONOCLONAL antibodies , *COST benefit analysis , *COST effectiveness , *CLINICAL medicine , *DESCRIPTIVE statistics , *THEORY , *HOSPITAL care , *GABA , *ACUTE diseases , *QUALITY-adjusted life years , *DISCHARGE planning - Abstract
Background: According to the Chinese guidelines for lipid management (2023), evolocumab in combination with statins was recommended as secondary prevention of cardiovascular disease. However, because of the variation in the price of evolocumab and its different methods of confirming clinical efficacy, it was necessary to explore its economics and the impact of different methods of confirming efficacy on its economic studies. Objective: The purpose of this paper was to assess the cost-effectiveness of evolocumab with statins versus statins alone for patients with acute myocardial infarction(AMI) in China and to investigate the impact of different clinical effectiveness modeling approaches on economic outcomes. Methods: A Markov cohort state-transition model was used to estimate the incremental cost-effectiveness ratio (ICER) based on Chinese observational data on cardiovascular event rates, efficacy from the Asian subgroup of the FOURIER trial, cost and utility from the Chinese Yearbook of Health Statistics, health insurance data, and published studies conducted in China. This study conducted subgroup analyses for different populations and dosing regimens; sensitivity analyses for parameters such as cost, utility, and cardiovascular event rates; and scenario analyses on hospital hierarchy, time horizon, starting age, and price for statins. Results: ICERs ranged from 27423 to 214777 Chinese yuan(CNY) per QALY gained, all below the willingness-to-pay threshold of CNY 257094. Only when the time horizon became small, the ICERs were greater than the willingness-to-pay. The probabilities that adding evolocumab to statins was cost-effective ranged from 76 to 98%. When the time horizon became small, i.e. evolocumab was discontinued before the age of 75 (after conversion), the corresponding ICERs were almost always greater than the willingness-to-pay. ICERs for modelling approaches based on clinical endpoints were 1.34 to 1.95 times higher than ICERs for modelling approaches based on reduced LDL-C levels. Conclusions: From the Chinese healthcare and private payer perspectives, adding evolocumab to statin therapy in AMI patients is more likely to be a cost-effective treatment option at the current list price of CNY 283.8. However, evolocumab may not be cost-effective if used for shorter periods of time. The results based on different clinical effectiveness modeling approaches were significantly different. [ABSTRACT FROM AUTHOR]
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- 2023
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19. Mathematical model for estimating the leaf area of cured dry tobacco using linear measurements.
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Fujian Zhang, Wenjie Bian, Haojun Wang, and Bo Yang
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LEAF area , *TOBACCO use , *LENGTH measurement , *AKAIKE information criterion , *MATHEMATICAL models , *TOBACCO - Abstract
Leaf area of dried Flue-cured tobacco is a reflection of climate and stage of growth of fresh tobacco in field; it also serves as the foundation for calculating a number of significant physical properties of tobacco. So the purpose of this paper was to establish a model to estimate the leaf area of dried Flue-cured tobacco in China from linear dimensions. Three Hundred eight tobacco leaves from different growing area and stalk position were sampled randomly and separated for model selection among linear, proportional and power model type and external evaluation individually. Results showed that there was a significant and strong correlation between leaf area and length×width, The equation LA = 0.495(L×W), where LA is the leaf area and L×W is the product of leaf length and width, was optimum and adequate for the estimation of leaf area of dried tobacco in China examined by Fisher’s test, Akaike delta information criterion (AIC) and Bayesian information criterion (BIC). Growing area and stalk position had minor effect on the parameter before (L×W). The equation can sufficiently predict the area of leaf for external evaluation. [ABSTRACT FROM AUTHOR]
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- 2023
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20. Construction of Mathematical Model of Logistics Delivering Based on Intelligent Mobilization.
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Liang, Haijun and Guo, Jing
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PARTICLE swarm optimization , *MATHEMATICAL models , *INTELLIGENT transportation systems , *TECHNOLOGICAL innovations , *GENETIC algorithms , *MATHEMATICAL optimization , *LOGISTICS , *INTELLIGENT tutoring systems - Abstract
Distribution process is the core of logistics enterprise system. Efficient distribution process is the key for enterprises to improve logistics service level, gain competitive advantage, and win customers. In order to reduce the design error of the system and ensure the effective operation of the system, this paper establishes the system model and analyzes the properties of the model through the evaluation and analysis of various resources of the distribution system. The future development of intelligent logistics system is not only the key for logistics enterprises to win competition, but also a new measure to promote China's economic development. This is not only a typical NP hard problem, but also a major challenge for the rational and scientific development of the intelligent logistics industry. Based on the previous theoretical research results, this paper intends to explore the intelligent logistics distribution route selection scheme by using mathematical modeling methods such as particle swarm optimization, so as to provide new technologies and methods for logistics distribution operation and management decision-making. The results show that compared with the traditional genetic algorithm, the accuracy of the improved particle swarm optimization algorithm is improved by 10.36%. This method effectively improves the operation cycle and link efficiency and achieves the purpose of optimization. The improved particle swarm optimization algorithm proposed in this paper is not only more suitable and effective for enterprise decision makers to deal with subjective judgments in an imprecise environment. It is also based on the evaluation sequence of each indicator of the alternative obtained from the evaluation and the comprehensive evaluation of all indicators. By weighting and considering the results, the best solution for enterprise logistics and distribution is selected. [ABSTRACT FROM AUTHOR]
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- 2022
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21. Concavity-convexity of distribution system security region. Part II: Mathematical principle, judgment, and application.
- Author
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Jiao, Heng, Xiao, Jun, Zu, Guoqiang, Song, Chenhui, Lv, Zihan, Bao, Zhenyu, and Qiu, Zekai
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SECURITY systems , *TOPOLOGICAL property , *MATHEMATICAL models - Abstract
This paper is the second in a two-part series on the concavity-convexity of the distribution system security region (DSSR). In Part I, the concave-convex characteristics and mechanism of DSSR are revealed by observing many case grids. In Part II (this paper), the concave-convex principle of DSSR is revealed through mathematical deduction. Firstly, the relevant concepts of sub-regions are proposed, and a DSSR model based on the union of sub-regions is developed. Secondly, the concave-convex principle of DSSR is proposed. The proposed criteria show that the security region of a distribution system with a single load transfer path for each feeder is convex, while that with multiple load transfer paths for some feeders can be concave or convex. Thirdly, the proposed criteria are deduced mathematically. Fourthly, based on the criteria, a method is proposed to judge whether a DSSR is concave or convex. Fifthly, the proposed criteria and method are verified through several cases, and the DSSR concavity-convexity of real distribution systems in China is also analyzed. Finally, the applications of DSSR concavity-convexity are illustrated. This work lays a mathematical foundation for the research of the topological properties of DSSR and is also useful for the application of DSSR. • The DSSR mathematical model based on the union of sub-regions is developed. • Three criteria are proposed and proved, revealing the concave-convex principle of DSSR. • A judgment method for DSSR concavity-convexity is proposed based on these criteria. • The DSSR concavity-convexity of real distribution systems in China is analyzed. • The application values of DSSR concavity-convexity are demonstrated. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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22. Analysis of Marine Economic Development and Innovation under Environment Constraint Based on the VAR Model.
- Author
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Wu, Danjie
- Subjects
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VECTOR autoregression model , *IMPULSE response , *ECONOMIC development , *TECHNOLOGICAL innovations , *ECONOMIC research , *EMPLOYMENT statistics , *DIFFUSION of innovations , *MARINE biodiversity , *ECONOMICS , *INDUSTRIES , *MATHEMATICAL models , *THEORY - Abstract
Building a new development pattern based on the "double-cycle" is a major strategic plan of China. Under the background of the new development pattern of the "double-cycle" and the context of environmental constraints, this paper tries to explore the impact of marine economic development on marine cultural industry and marine innovation development, the extent of the impact of marine cultural industry on marine economic growth, and the internal relationship between them under the new development pattern of double circulation. In this paper, Fujian Province is taken as the research object to construct an indicator system of the marine culture development to reflect the living standard, employment level, and spiritual and cultural levels of people in the marine area, and the external influence of the marine economy and marine culture industry is taken as the indicator variable to measure the integrated development. The internal changes are regarded as the index to assess the integration level of the two, and the evaluation theoretical model of the dynamic evolution level of the marine economy and marine cultural industry is constructed. The vector autoregression model and impulse response function are used to study the interactive correlation between the growth of the marine economy and the development of the cultural industry. The results show the following: In the long run, there is a cointegration relationship between the marine culture industry and the gross ocean product (GOP), which is a long-term balanced and stable relationship. The development level of the marine economy and the development of marine culture industry are mutually influencing and promoting. [ABSTRACT FROM AUTHOR]
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- 2022
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23. Government Structure, Political Connection, and Enterprise Resource Acquisition of Multidimensional Environmental Impact: An Empirical Study Based on the Structural Equation Model.
- Author
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Lv, Qiuying and Chen, Chen
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ENVIRONMENTAL impact analysis , *STRUCTURAL equation modeling , *GOVERNMENT business enterprises , *ADMINISTRATIVE reform , *BUSINESS enterprises , *ENTERPRISE resource planning , *MATHEMATICAL models , *PRACTICAL politics , *PUBLIC administration , *MULTIDIMENSIONAL Health Locus of Control scales , *THEORY - Abstract
Preferential access to scarce resources can bring competitive advantages and better performance to enterprises. However, the existing literature has a relatively single research path on the influencing factors of enterprise resource access, which has lack of sufficient research from the perspective of multidimensional environment. In particular, as an important factor affecting enterprises' access to external resources, few studies have given empirical results on the impact of political factors such as government structure on enterprise resource access. Preferential access to scarce resources can bring competitive advantages and better performance to enterprises. However, the existing literature has a relatively single research path on the influencing factors of enterprise resource access, which lacks sufficient research from the perspective of multidimensional environment. In particular, as an important factor affecting enterprises' access to external resources, few studies have given empirical results on the impact of political factors such as government structure on enterprise resource access. Through the discussion of multidimensional environmental factors, this paper can provide theoretical reference for the reform of government institutions and the establishment of good political relations between enterprises and the government. Focusing on the multidimensional environment of government structure, political relations, and enterprise resource acquisition, this paper takes 129 enterprises in Central China as samples and uses the structural equation model to empirically verify the relationship between the formalization of government structure, liaison mechanism, decentralization, and enterprise resource acquisition, especially the easing effect of political relations. The results show that the formalization of government structure is promoting enterprises to obtain policy resources and financial resources; the liaison mechanism helps enterprises to obtain financial resources and market resources; decentralization has a significant positive impact on enterprises' access to policy resources and market resources; and political connection magnifies the positive effect of government structure on enterprise resource acquisition, but there are differences in different dimensions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
24. Integration Level and Influencing Factors' Analysis of Forest Product Market Based on the Mathematical Model.
- Author
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Song, Linshu, Wang, Hao, Song, Weiming, and Yang, Chao
- Subjects
- *
FOREST products , *FACTOR analysis , *MATHEMATICAL models , *PYTHON programming language , *PRICE indexes - Abstract
This paper uses Python programming to improve the existing price index method and calculate the integration level of the forest products market in China. Based on the model, the influencing factors of domestic forest product market integration were examined empirically. The results show that the integration degree of the forest product market in recent years lags behind the average level in China. In this paper, the improvement of the existing price index method can calculate the level of market integration more quickly and accurately, and this improvement has obvious advantages in the case of a large amount of data. In terms of development, the overall pattern shows an increasing trend, and the eastern, central, and western provinces are gradually converging, although the differences between provinces continue to expand. In terms of influencing factors, the coefficient of the local government's emphasis on forestry, the prosperity of international trade in forest products, and highway density were significantly positive factors, while the number of foreign investors and the railway density had no significant effects. In this paper, the optimization of the measurement method of market integration makes it easier for scholars to obtain the data on the level of market integration and promote in-depth research in the field of market integration. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
25. Factors influencing Chinese undergraduate students' emotions in an online EFL learning context during the COVID pandemic.
- Author
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Shao, Kaiqi, Kutuk, Gulsah, Fryer, Luke K., Nicholson, Laura J., and Guo, Jidong
- Subjects
- *
ONLINE education , *STRUCTURAL equation modeling , *TEACHING methods , *MATHEMATICAL models , *INTERNET , *RATING of students , *LEARNING strategies , *UNDERGRADUATES , *ACADEMIC achievement , *EXPERIENCE , *SURVEYS , *ENGLISH as a foreign language , *THEORY , *STUDENTS , *FACTOR analysis , *TEACHERS , *COMMUNICATION , *INTELLECT , *PROFESSIONAL competence , *QUESTIONNAIRES , *CHI-squared test , *DESCRIPTIVE statistics , *RESEARCH funding , *EMOTIONS , *STUDENT attitudes , *ANXIETY , *STATISTICAL sampling , *COVID-19 pandemic , *EDUCATION - Abstract
Background: Considerable evidence suggests that students' achievement emotions are important contributors to their learning and success online. It is, therefore, essential to understand and support students' emotional experiences to enhance online education, especially under the COVID‐19 context. However, to date, very few studies have investigated how students' achievement emotions might be affected by teaching and learning factors in online learning environments. Objectives: Based on Pekrun's (2006) control‐value theory of achievement emotions, this study examined the influence of students' perceived online teaching quality and appraisals of control and value on their achievement emotions in an online second language (L2) learning context instigated by the COVID‐19. Methods: Data were collected using an online survey of 1503 undergraduates from ten universities across different regions of China. Confirmatory factor analyses (CFA) were performed to test the validity of the instruments and structural equation modelling were conducted to examine the relations between L2 teaching and learning variables. Results and Conclusions: Results revealed that perceived teacher internet and communication technology competence had positive effects on enjoyment, but negative effects on anxiety and boredom, and these effects were fully mediated by perceived control and/or value. Perceived chaotic teaching structure (CTS) had reverse effects for the three emotions. Perceived CTS effects on enjoyment and anxiety were fully and partially mediated by perceived control, respectively. Takeaways: Online teaching quality is critical for students' appraisals and emotions towards L2 learning. Teachers should strive to improve online teaching quality and design interventions targeting students' perceived control and value to temper their affective experiences associated with the crisis‐prompted online teaching practices. Lay Description: What is already known about this topic: Teachers' internet and communication technology (ICT) competence and pedagogical design can enhance students' e‐learning efficacy, motivation and interests.Students' perceived control and value can influence their achievement emotions in online learning.Teacher's ICT competence and pedagogical design can impact students' emotions in online learning. What this paper adds: Perceived teacher ICT competence and chaotic teaching structures can have differential impact on students' perceived control and value for e‐learning.Perceived control and intrinsic value differently mediated the effects of the two teaching factors on students' emotions for e‐learning.Perceived teacher ICT competence and chaotic teaching structures can have both direct and indirect effects on students' e‐learning emotions via perceived control and value. Implications for practice and/or policy: Teacher training and development programs should prepare teachers for varying teaching formats including unplanned online teaching due to a forced switch to remote teaching.Teachers should acquaint themselves with using various online platforms and software to communicate the goals, expectations, structures and requirements of their language lessons to students' in a clear manner.Online language teaching interventions aiming to increase or decrease a specific emotion could directly target specific combinations of teaching characteristics and appraisals. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
26. Overwintering performance of bamboo leaves, and establishment of mathematical model for the distribution and introduction prediction of bamboos.
- Author
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Yufang Wu, Jing Li, Lixia Yu, Shuguang Wang, Zhuo Lv, Hao Long, Jingyu Zhai, Shuyan Lin, Yong Meng, Zhihua Cao, and Hui Sun
- Subjects
BAMBOO ,MATHEMATICAL models ,NONLINEAR regression ,PHOTOSYNTHETIC rates ,TEMPERATURE distribution ,PREDICTION models - Abstract
Bamboo has great economic values and is used extensively in many industries, and their natural distribution range was divided into 12 zones in China according to the temperature of their geographical distribution in previous works. Different bamboo species had significantly different abilities in low-temperature tolerance, which need to be considered carefully during ex-situ introduction. In this paper, we observed and evaluated the low-temperature damage of 19 bamboo species in winter, and measured the physiological changes of bamboo leaves. A total of 3060 leaf samples were obtained from 102 core collections in 34 bamboo species from the 5 regions of Chinese mainland for anatomical comparison, in order to screen out the key anatomical indicators related to their low-temperature tolerance and to establish a mathematical prediction model for bamboo introduction. The results showed that the low-temperature resistance of clustered bamboos was generally lower than that of the scattered bamboos. The decreased temperature led to the constant decrease of net photosynthetic rate and transpiration rate, but the increase of soluble sugar content in all bamboo species. There was no dormancy for all bamboo species in winter. The temperate bamboos showed lower photosynthesis as compared to tropical bamboos in winter. The leaf shape of bamboos was closely related to their distribution. A total of 13 leaf indicators were screened and more suitable to estimate the low-temperature tolerant abilities of bamboos and to predict their distribution. The MNLR (multiple nonlinear regression) mathematical model showed the highest fitting degree and the optimal prediction ability in the potential northernmost introduction range of bamboos. This study lay a foundation for bamboo introduction, and could also reduce the economic losses caused by the wrong introduction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
27. Crucial States Estimation in Radio Block Center Handover Using Petri Nets With Unobservable Transitions.
- Author
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Lan, Hao, Tong, Yin, and Seatzu, Carla
- Subjects
- *
PETRI nets , *DISCRETE systems , *HIGH speed trains , *FAULT diagnosis - Abstract
The radio block center (RBC) is one of the most essential ground systems in a high-speed train control system both in Europe and in China. The RBC handover procedure is an important function of RBC, which affects the transport efficiency, reliability and safety of railways. Analysis of crucial states in the RBC handover procedure is helpful to determine whether there are potential risks in the procedure, and to locate the fault in time when a fault occurs. In this paper, we study a property, called C-detectability, of the RBC handover. This property has been defined in discrete event systems and requires that the crucial states can be determined uniquely by observing the system output. Taking the RBC handover procedure in the Chinese train control system level 3 (CTCS-3) as an example, we first model the RBC handover procedure using Petri nets, which are a graphical and mathematical modeling tool to formalize the behavior of discrete event systems. Then, based on the notion of basis reachability graph, an efficient approach is used to check C-detectability of the Petri net modeling the handover procedure. Note to Practitioners—The railway system is a safety-critical system. System safety is essential to the railway system. It is necessary to provide formal methods to model the system and analyze its properties. The motivation of this work is to present a general modeling framework of railway systems for the crucial states estimation. The crucial states estimation of the railway system has not been discussed yet in the literature despite its importance due to its relationship with the safety of the railway. In particular, estimating the crucial states in the railway system helps to determine whether there are potential risks in the system. In this paper, we investigate a new state estimation property (C-detectability), which is related to fault diagnosis, marking estimation and fault identification. Future research will consider the use of timed Petri nets to increase the modeling power and to allow the performance analysis of the railway system. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
28. Exploring the Interrelationships between Public Health, Fiscal Decentralization, and Local Government Debt in China.
- Author
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Cao, Mingyao, Duan, Keyi, Cao, Mingyu, and Ibrahim, Haslindar
- Subjects
LOCAL government -- Economic aspects ,HEALTH policy ,INVESTMENTS ,DEBT ,MATHEMATICAL models ,PUBLIC health ,REGRESSION analysis ,MEDICAL care costs ,THEORY ,GOVERNMENT policy ,ORGANIZATIONAL effectiveness ,SOCIOECONOMIC disparities in health ,DESCRIPTIVE statistics ,DECENTRALIZATION in management ,MEDICAL needs assessment ,ECONOMICS - Abstract
This paper investigates the interrelationships among local government debt, fiscal decentralization, and public health. The investigation begins by constructing a theoretical model to analyze the inherent connections between these variables. Subsequently, an empirical analysis is conducted using data from China between 2015 and 2021. The findings demonstrate a bidirectional relationship between fiscal decentralization, local government debt, and public health. Specifically, it is observed that an increase in local government debt has adverse effects on both fiscal decentralization and public health, while fiscal decentralization has a positive impact on public health. These insights are consistently validated through rigorous regression methodologies, affirming the robustness and significance of these relationships. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
29. Tripartite Evolutionary Game and Simulation Analysis of Healthcare Fraud Supervision under the Government Reward and Punishment Mechanism.
- Author
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Zhu, Change, Zhou, Lulin, Zhang, Xinjie, and Walsh, Christine A.
- Subjects
HEALTH insurance reimbursement laws ,HEALTH care industry ,COMPUTER simulation ,GOVERNMENT regulation ,MATHEMATICAL models ,GAMES ,MEDICAL care costs ,FRAUD ,MEDICAL care use ,REWARD (Psychology) ,PUNISHMENT ,THEORY - Abstract
This study aims to provide useful insights for the Chinese government in dealing with healthcare fraud by creating an evolutionary game model that involves hospitals, third-party entities, and the government based on the government reward and punishment mechanism. This paper analyzes the evolutionary stability of each participant's strategy choice, discusses the influence of each element on the tripartite strategy choice, and further analyzes the stability of the equilibrium point in the tripartite game system. The results show that (1) the government increasing fines on hospitals is conducive to compliant hospital operations, and the incentive mechanism has little effect on such operations; (2) the lack of an incentive mechanism for third parties results in false investigations by third parties; and (3) rewards from higher levels of government promote strict supervision by local governments, but that the high cost of supervision and rewards for hospitals inhibits the probability of strict supervision. Finally, Matlab 2020a is used for simulation analysis to provide a reference for the government to improve the supervision of healthcare fraud. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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- View/download PDF
30. The Roles of Trust and Its Antecedent Variables in Healthcare Consumers' Acceptance of Online Medical Consultation during the COVID-19 Pandemic in China.
- Author
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Yan, Mian, Zhang, Meijuan, Kwok, Alex Pak Ki, Zeng, Haoyan, and Li, Yanfeng
- Subjects
STRUCTURAL equation modeling ,CONFIDENCE intervals ,MATHEMATICAL models ,CROSS-sectional method ,CONSUMER attitudes ,QUANTITATIVE research ,SURVEYS ,THEORY ,DESCRIPTIVE statistics ,RESEARCH funding ,TECHNOLOGY ,EMPIRICAL research ,DATA analysis software ,STATISTICAL sampling ,COVID-19 pandemic ,TRUST ,TELEMEDICINE - Abstract
Online medical consultation (OMC) is generating considerable interest among researchers and practitioners due to the mandatory quarantine measures implemented during the COVID-19 pandemic in China. However, the acceptance rate of OMC has declined over time. This paper aims to empirically investigate OMC acceptance using a proposed research model by integrating the technology acceptance model (TAM) with trust and its antecedent variables. A quantitative self-administered cross-sectional survey was conducted to collect data from 260 healthcare consumers. A partial least squares structural equation modeling method was used to examine the data. Results revealed that healthcare consumers' behavioral intention was influenced by attitudes, while perceived usefulness and trust significantly influenced behavioral intention through attitude as a mediator. In addition, perceived risk, perceived privacy protection, network externalities, cognitive reputation, and interactivity directly influenced trust. Overall, the research model explained 50% of the variance in attitude and 71% of the variance in behavioral intention. The study's findings should provide useful insights into making effective design, development, and implementation decisions for OMC services. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
31. Bio-inspired modelling as a practical tool to manage giant panda population dynamics in captivity.
- Author
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Rong, Haina, Duan, Yingying, Valencia-Cabrera, Luis, Zhang, Gexiang, Qi, Dunwu, and Pérez-Jiménez, Mario J.
- Subjects
- *
GIANT panda , *PANDAS , *CAPTIVITY , *STOCHASTIC models , *CELL anatomy , *POPULATION dynamics , *MATHEMATICAL models - Abstract
The highly endangered giant panda (Ailuropoda melanoleuca) is the world's most widely recognised conservation icon. Population dynamics models can get on track to a healthy population for giant pandas, and assess its development over time. This paper proposes a new way to study population dynamics of giant pandas in captivity by means of membrane computing, a bio-inspired computational paradigm based on processing multisets of objects within a cell structure, following a series of evolution rules. This framework is used to model the intrinsically stochastic real-life evolution processes of giant pandas, based on pedigree data. This is the first attempt to collect and analyse so complete source, and to investigate population dynamics of giant pandas based on them. Pedigree data consisting of the number of giant panda individuals per age are provided by Chengdu Research Base of Giant Panda Breeding of China. A special simulator has been developed to assist in the design and formal verification of the mathematical model presented. Particularly, the model feasibility, effectiveness, soundness and robustness have been validated by the simulator, which also enables decision-making based on the simulation results of conducted virtual experiments. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
32. 基于代理模型的炼厂氢网络与脱硫系统同步优化.
- Author
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吴依凡, 夏志鹏, 吉 旭, and 周 利
- Subjects
MATHEMATICAL programming ,DESULFURIZATION ,HYDROGEN sulfide ,HYDROGEN ,MATHEMATICAL models ,DILEMMA - Abstract
Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
33. Analysis of the Game Behavior of Smart Community Regulatory Participants to Co-Create the Smart City: Post-Human Stakeholder Perspectives.
- Author
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Wan, Lijun, Li, Shanjie, and Yin, Shi
- Subjects
- *
MATHEMATICAL models , *PUBLIC administration , *BEHAVIOR , *INDEPENDENT living , *THEORY , *COMMUNITY-based social services , *SOCIAL skills , *SUSTAINABLE development - Abstract
The sustainable development of smart community is the key to China's grassroots governance and also the general trend of China's urban modernization. In the supervision of the smart community, the optimization of the behavior of the regulatory subject cannot be separated. Previous studies have focused more on how subjects participate in supervision and less on the behavior of stakeholders in the game. This paper analyzes the game behavior of regulatory participants in the process of sustainable development of smart community and studies the optimization strategy of regulatory behavior according to the game behavior logic among participants. The results show the following. (i) Government behavior plays a leading role in supervision. (ii) When the government invests resources in the screening of third-party evaluation agencies and service purchase and mainly adopts policy punishment methods for stakeholders with rent-seeking behavior, the probability of regulatory participation stakeholders' positive behavior is the greatest. (iii) The improvements should be made from the aspects of information network construction, the refinement of reward and punishment measures, and the improvement of evaluation party access rules. This not only helps to enhance the good supervision situation of the supervision enthusiasm of the participants but also can realize the self-discipline operation of the smart community and enhance the responsibility consciousness of the evaluation institutions. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
34. Recent Advances and Applications of AI-Based Mathematical Modeling in Predictive Control of Hybrid Electric Vehicle Energy Management in China.
- Author
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Zhang, Qian, Tian, Shaopeng, and Lin, Xinyan
- Subjects
HYBRID electric vehicles ,ENERGY management ,ARTIFICIAL intelligence ,MATHEMATICAL models ,PREDICTION models ,FOCUS automobile - Abstract
Artificial intelligence is widely used in mathematical modeling. The technical means in mathematical modeling are more and more diversified, especially the application of artificial intelligence algorithm greatly promotes the development of mathematical modeling. In recent years, because of its great influence on the fuel consumption, output power and exhaust performance of automobiles, the control strategy has become a research hotspot and focus in automobile R&D industry. Therefore, based on the relevant research results in recent years, after studying and analyzing the typical control strategies of hybrid vehicles, this paper finally puts forward the energy management strategy of hybrid vehicles based on model predictive control (MPC), and strives to contribute to the academic research of energy management strategies of hybrid vehicles. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
35. 安徽省癌症防控现状及城市癌症筛查模式探讨.
- Author
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张娟, 魏东华, 尹惠萍, 马艳玲, and 钱立庭
- Subjects
TUMOR prevention ,EVALUATION of human services programs ,MATHEMATICAL models ,EARLY detection of cancer ,THEORY ,COMMUNITY-based social services ,TUMORS ,METROPOLITAN areas - Abstract
Copyright of Practical Oncology Journal is the property of Journal of Practical Oncology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
- Full Text
- View/download PDF
36. Research on a Risk Early Warning Mathematical Model Based on Data Mining in China's Coal Mine Management.
- Author
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Yu, Kai, Zhou, Lujie, Liu, Pingping, Chen, Jing, Miao, Dejun, and Wang, Jiansheng
- Subjects
- *
DATA mining , *COAL mining safety , *MATHEMATICAL models , *QUALITY control charts , *LOSS control - Abstract
The degree of informatization of coal mine safety management is becoming higher and higher, and a large amount of information is generated in this process. How to convert the existing information into useful data for risk control has become a challenge. To solve this challenge, this paper studies the mathematical model of coal mine risk early warning in China based on data mining. Firstly, the coal mine risk data was comprehensively analyzed to provide basic data for the risk prediction model of data mining. Then, the adaptive neuro-fuzzy inference system (ANFIS) was optimized twice to build the coal mine risk prediction model. By optimizing the calculation method of the control chart, the coal mine risk early warning system was proposed. Finally, based on the coal mine risk early warning model, the software platform was developed and applied to coal mines in China to control the risks at all levels. The results show that the error of the optimized ANFIS was reduced by 66%, and the early warning error was reduced by 57%. This study aimed to provide implementation methods and tools for coal mine risk management and control, and data collected has reference significance for other enterprises. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
37. Procurement models under purchase price uncertainty for Chinese oil refineries.
- Author
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Xie, Zhixue, Park, ChanS., and Zheng, Li
- Subjects
INDUSTRIAL procurement ,MATHEMATICAL models ,PETROLEUM product sales & prices ,SUPPLY chains ,INDUSTRIAL engineering research ,PETROLEUM industry ,COST effectiveness ,MANAGEMENT - Abstract
This paper examines the crude oil procurement practices of Chinese oil refineries to suggest improved procurement policies that can reduce the cost associated with fluctuating oil prices in the international spot market. In the industrial environment, the purchase price of crude oil is based on the spot price at the time of delivery rather than that at the time of ordering. Therefore, the purpose of this paper is to develop a procurement model that factors in the spot prices at both the time of ordering and the time of delivery so that the total procurement cost can be minimised over the planning horizon. First, the shortcomings of the current procurement policy of a typical Chinese refinery are presented. A model to address these shortcomings is then developed and embellished by incorporating market information dynamics through Bayesian learning. The effectiveness of the proposed models is compared with the current practice using the historical spot price data of crude oil from two representative spot markets; this comparison verifies that the model with Bayesian sampling performs well empirically and can result in considerable cost savings. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
38. MGPM Methods for Rectangular Single-Size Printed Circuit Board Orthogonal Packing Problems.
- Author
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Pan, Pengfei, Han, Yi, Lv, Hexin, Dai, Guoyong, and Jin, Zhiyong
- Subjects
- *
SIMPLEX algorithm , *DYNAMIC programming , *COMBINATORIAL optimization , *PRINTED circuits , *MATHEMATICAL models , *PRINTED circuit design , *RECTANGLES - Abstract
Printed circuit board (PCB) orthogonal packing problems derive from the massive circuit board production process in the electronic industry. In the early stage, it mainly relied on human experiences to make decisions on how to make the most of each sheet while meeting customers' orders. Up till now, researchers in enterprises and academic circles are still trying to explore effective mathematical models and feasible optimization methods. In most cases, what PCB companies generally face is the orthogonal layout decision, which considers positioning each rectangle PCB piece (PCB-P) on a rectangle sheet board (panel) in an ideal way so that each panel has the minimal remains with the most PCB-Ps. In this paper, multi-round gradual packing methods (MGPMs) are proposed based on the idea of combinatorial optimization and dynamic programming. MGPMs include the depth priority-based method (MGPM-DP) and breadth priority-based branch-and-prune method (MGPM-BC). The former has the advantage of finding better solutions, while the latter has the advantage of consuming short computational time. Through extensive computational tests on real data from a PCB production enterprise in China, both MGPM-DP and MGPM-BC have achieved noticeable and satisfactory results compared with the simplex method, dynamic programming method, and a widely used industrial software (Yuanbo) in China. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
39. Construction of Resource Ecological Compensation Mechanism Model under Rural Leisure Sports Environment.
- Author
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Rao, Juan and Cao, Xiaofen
- Subjects
- *
PSYCHOLOGICAL feedback , *LEISURE , *SPORTS , *PROBLEM solving , *ECOLOGICAL models , *ECOTOURISM , *CONSERVATION of natural resources , *MATHEMATICAL models , *THEORY - Abstract
In order to solve the problem of resource ecological compensation, this paper proposed a model of resource ecological compensation mechanism based on a rural leisure sports environment. The model is carried out in many places in China. The survey data involves 31 provinces, 10 years, and 43 indicators, with a total of 43 × 10 × 31 = 13,330 data. The preliminary basis of mechanism construction is summarized from four aspects. Finally, make full use of modern information technology to improve the network platform of the compensation mechanism, promote the efficient allocation and comprehensive utilization of ecotourism resources, and lay a solid foundation for establishing a reasonable and perfect resource ecological compensation mechanism and ensuring the long-term and stable operation of the mechanism. Through the experiment, it is found that the timely and effective publication of information can eliminate the inner estrangement between the two sides, so as to make the behavior of both sides more rational. A special information feedback department is established to deal with the opinions put forward by all compensation parties in tourism development, extract effective information, summarize and publish reasonable guidance information, and guide the compensation of both sides to an ideal balance through the feedback of this information. The effectiveness of the experiment is verified. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
40. ANALYSIS AND OPTIMIZATION TEST OF OPERATION PROCESS OF CLEANING DEVICE OF CORN SEED HARVESTER.
- Author
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Zedong ZHAO, Xiaohui YANG, and Guohai ZHANG
- Subjects
- *
CORN seeds , *ANGULAR velocity , *AIR flow , *MATHEMATICAL models , *CLEANING - Abstract
Aiming at the current problem of the high rate of impurity and loss in the cleaning device of corn seed harvesters in China, this paper took the cleaning device of 4YZL-6 self-propelled corn seed harvester as a sample and analyzed the movement law of the material on the sieve. Box-Behnken response surface experimental design theory was used for the orthogonal tests. Wind inlet angle, airflow velocity, and crank angular velocity were selected as influencing factors, and the impurity rate and loss rate as the evaluation index of operation quality. A regression mathematical model between each influencing factor and indicator was established, and the model was also integrated and optimized. The optimal parameter combination was obtained as follows: the wind inlet angle was 37.95o, the airflow velocity was 11.3 m/s, and the crank angular velocity was 4.1 r/s. The corresponding impurity rate was 0.87% and the loss rate was 0.34%. Verification tests were conducted on the optimization results, and the test results showed that under the optimal combination of parameters, the impurity rate was 0.89% and the loss rate was 0.35%. The relative errors of each evaluation index and its model prediction were 2.29% and 2.94%, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
41. Mathematical Modeling and Stability Analysis of a Delayed Carbon Absorption-Emission Model Associated with China's Adjustment of Industrial Structure.
- Author
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Han, Leilei, Sui, Haokun, and Ding, Yuting
- Subjects
- *
CARBON emissions , *MULTIPLE scale method , *MATHEMATICAL models , *CARBON analysis , *HOPF bifurcations , *CARBON offsetting , *TREE planting - Abstract
Global warming has brought about enormous damage, therefore, some scholars have begun to conduct in-depth research on peak carbon dioxide emissions and carbon neutrality. In this paper, based on the background of China's upgrading industrial structure and energy structure, we establish a delayed two-dimensional differential equation model associated with China's adjustment of industrial structure. Firstly, we analyze the existence of the equilibrium for the model. We also analyze the characteristic roots of the characteristic equation at each equilibrium point for the model, then, we analyze the stability of the equilibrium point for the model according to the characteristic root, and discuss the existence of Hopf bifurcation of the system by using bifurcation theory. Secondly, we derive the normal form of Hopf bifurcation by using the multiple time scales method. Then, through the official real data, we present the range of some parameters in the model, and determine a set of parameters by reasonable analysis. The validity of the theoretical results is verified by numerical simulations. Finally, we use the real data to forecast the time of peak carbon dioxide emissions and carbon neutralization. Eventually, we put forward some suggestions based on the current situation of carbon emission and absorption in China, such as planting trees to increase the growth rate of carbon absorption, deepening industrial reform and optimizing energy structure to reduce carbon emissions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
42. An Empirical Study on Coordinated Development between Ecological Environment and Regional Economy by Big Data Mathematical Model Analysis in Tibetan Area.
- Author
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Gao, Li, Fu, Liping, and Tsai, Sang-Bing
- Subjects
- *
MATHEMATICAL analysis , *MATHEMATICAL models , *SUSTAINABLE development , *ECONOMIC indicators , *BIG data - Abstract
The cold and high altitude Tibetan area (hereinafter referred to as Tibetan area) is a special geographical area in western China. Whether the local economic development and EE (ecological environment) are coordinated or not directly affects the sustained and healthy economic and social development of the whole Tibetan area. Firstly, this paper discusses the relationship between economic growth and EE on the basis of existing related theoretical research. Then, 15 indicators of economic system and environmental system were selected, and the coupling degree model and coupling coordination degree model were constructed to quantitatively analyze the dynamic model of regional economic and EE coupling and coordinated development in Tibetan areas from 2010 to 2020. The research found that in the past 11 years, the comprehensive index of EE of four regions in Tibetan areas has changed from 0.5 to 0.6, and the comprehensive index of the economy of four regions in Tibetan areas has changed from 0.51 to 0.74. On the whole, the coordination degree and coordinated development degree of green development in Tibetan areas have changed at the same time compared with the years, and since 2016, both of them have had the same trend and both of them are beginning to develop in a good direction. Since 2017, the economic development has been relatively advanced, while the EE has lagged behind, showing a fluctuating state, while the level of coordinated development has been continuously improved. This study has certain reference value for promoting ecological protection and green development in Tibetan areas. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
43. Mathematicians', mathematics educators', and mathematics teachers' professional conceptions of the school learning of mathematical modelling in China.
- Author
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Xu, Binyan, Lu, Xiaoli, Yang, Xinrong, and Bao, Jiansheng
- Subjects
MATHEMATICS teachers ,EDUCATORS ,MATHEMATICIANS ,MATHEMATICAL models ,PROFESSIONAL schools ,MATHEMATICS - Abstract
Mathematical modelling has been included in many mathematics curricula worldwide, and China's curricula are no exception. The development of modelling competencies has recently been listed among the Chinese mathematics curriculum's six key objectives. However, the manner in which nationwide learning and teaching of modelling should be conducted presents a key challenge to China's schools, most of which are wholly lacking in experience of this practice. In this study we present a thematic analysis of the conceptions of four mathematicians, five mathematics educators and seven mathematics teachers, with regard to the learning and teaching of modelling. The results show that the participants' views of modelling can be categorised and linked to the following theoretical perspectives of modelling: applied, epistemological, educational, pedagogical and conceptual perspectives. Interestingly, the mathematicians and mathematics educators tended towards the atomistic approach to the learning and teaching of modelling, while the mathematics teachers placed greater emphasis on the holistic approach. The mathematicians and mathematics educators stressed student autonomy, while the teachers emphasised teacher demonstration. All participants considered group work to be an appropriate means of conducting modelling learning and teaching. Additionally, some teachers were concerned that modelling could not be incorporated into mathematical teaching and learning if it could not be included in high-stakes examinations. The paper concludes with a discussion on the rationale behind the existence of the various conceptions and the potential insights that may be drawn from these conceptions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
44. A fractional‐order mathematical model for analyzing the pandemic trend of COVID‐19.
- Author
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Agarwal, Praveen, Ramadan, Mohamed A., Rageh, Abdulqawi A. M., and Hadhoud, Adel R.
- Subjects
- *
COVID-19 , *BASIC reproduction number , *COVID-19 pandemic , *MATHEMATICAL models , *SARS-CoV-2 , *INFECTIOUS disease transmission , *DISEASE outbreaks - Abstract
Many countries worldwide have been affected by the outbreak of the novel coronavirus (COVID‐19) that was first reported in China. To understand and forecast the transmission dynamics of this disease, fractional‐order derivative‐based modeling can be beneficial. We propose in this paper a fractional‐order mathematical model to examine the COVID‐19 disease outbreak. This model outlines the multiple mechanisms of transmission within the dynamics of infection. The basic reproduction number and the equilibrium points are calculated from the model to assess the transmissibility of the COVID‐19. Sensitivity analysis is discussed to explain the significance of the epidemic parameters. The existence and uniqueness of the solution to the proposed model have been proven using the fixed‐point theorem and by helping the Arzela–Ascoli theorem. Using the predictor–corrector algorithm, we approximated the solution of the proposed model. The results obtained are represented by using figures that illustrate the behavior of the predicted model classes. Finally, the study of the stability of the numerical method is carried out using some results and primary lemmas. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
45. Measurement, Evaluation, and Model Construction of Mathematical Literacy Based on IoT and PISA.
- Author
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Chen, Yunfeng
- Subjects
- *
MATHEMATICAL models , *LITERACY , *MIDDLE school teachers , *EDUCATIONAL standards , *HIGH school seniors - Abstract
"Mathematics Curriculum Standard for Ordinary Senior High School" points out that mathematical modelling literacy is the literacy of abstracting real problems mathematically, expressing problems with mathematical language, and building models with mathematical methods to solve problems. It assesses the amount to which students who are about to finish compulsory schooling have the knowledge and aptitude to deal with future life issues, based on the notion of lifelong learning. The usage of a local integrated development environment requires a number of complex processes, including installation and setup, as well as the procurement of necessary hardware. In reality, in order to nurture students, the core literacy of mathematics is to completely execute quality education, further identify the training and development direction of talents, and infiltrate the core literacy material into junior high school mathematics classroom instruction. For such a large-scale international education measurement project, the research and development of test questions is very important. Therefore, detailed technical consideration has been carried out and test volumes have been designed that are relatively suitable for different countries. The test questions are closely related to life, while there are few questions related to real situational problems in the test, which are mathematically processed first. Due to the international background of evaluation, it is a great challenge for researchers to realize the localization of evaluation on the basis of adapting to the domestic situation. At the same time, there is no scientific and perfect mathematical modelling literacy evaluation system in China's basic education research. How can middle school front-line teachers better evaluate students' mathematical modelling literacy? As a result, it is critical to develop a scientific and quantitative mathematical literacy measurement model that will aid in the teaching and research of mathematical modelling by middle school front-line teachers, as well as contributing theoretically to the evaluation and research of mathematical modelling literacy in China. Therefore, based on mathematics literacy evaluation, this paper studies the hierarchy of the IoT and the measurement and evaluation model of mathematics literacy based on the IoT, as well as its enlightenment to the compilation of mathematics academic test questions in China. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
46. Mathematical modeling and simulated annealing algorithm for spatial layout problem.
- Author
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Jiang, Liupeng, Ji, Jie, Lu, Yuhua, Chen, Yanan, and Jia, Yue
- Subjects
- *
SIMULATED annealing , *MATHEMATICAL models - Abstract
The spatial layout of the port industrial zone problem is a core issue in port industrial zone planning, and it directly affects the actual effects of the port industrial zone. Firstly, considering that existing port industrial zone planning lacks in methods of quantitative analysis, this paper constructs a Mathematical model based on multi-objective programming, and the optimal scale of various industries of port industrial zone is obtained. Secondly, the paper takes the maximum dependence degree of port as objective function by using systematic layout planning tools, and solves the spatial layout of the port industrial zone. Finally, by taking Binhai Port industrial zone of China as an example, a port industrial zone spatial layout model is constructed and solved through simulated annealing algorithm. The optimal spatial layout program for Binhai Port industrial zone of China was obtained, which verifies the feasibility and accuracy of the model. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
47. Can mathematical modelling work as a creativity-demanding activity? An empirical study in China.
- Author
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Lu, Xiaoli and Kaiser, Gabriele
- Subjects
MATHEMATICAL models ,EMPIRICAL research ,MATHEMATICS teachers ,CHINESE students ,SECONDARY school students - Abstract
Creativity has been identified as a key characteristic that allows students to adapt smoothly to rapid societal and economic changes in the real world. However, Chinese students appear to perform less well in mathematical problem-solving and problem-posing abilities, which are strongly connected to mathematical creativity. Mathematical modelling has recently been introduced as one of the six core competencies in the Chinese mathematical curriculum and is built on students' ability to solve real-world problems using mathematical means. As mathematical modelling is characterised by openness regarding the understanding of complex real-world problems and the complex relationship between the real world and mathematics, for the strengthening of creativity, mathematical modelling activities seem to be adequate to accomplish this purpose. In this paper, we describe a study with 71 upper secondary school students, 50 pre-service mathematics teachers, and 66 in-service mathematics teachers, based on an extended didactical framework regarding mathematical modelling as a creativity-demanding activity. The results of the study indicate a significant correlation between modelling competencies and creativity aspects. Especially significant correlations between the adequacy of the modelling approaches and the two creativity aspects of usefulness and fluency could be identified, as well as a significant negative correlation between usefulness and originality. The results of the correlational analysis of relationships among the four criteria were not always consistent in the three participant groups. Overall, the results have implications for the promotion of creativity for various expertise groups and demonstrate the dependency of the modelling activities on the mathematical knowledge of the participants and the mathematical topic with which they are dealing. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
48. The influence of the community climate on users' knowledge-sharing intention: the social cognitive theory perspective.
- Author
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Cai, Yang and Shi, Wendian
- Subjects
- *
HEALTH literacy , *SELF-efficacy , *KNOWLEDGE management , *MEDICAL care , *COMMUNITIES , *SOCIAL perception , *INTERNET , *EVALUATION of medical care , *SOCIAL learning theory , *SURVEYS , *COMMUNICATION , *MATHEMATICAL models , *THEORY - Abstract
The purpose of this paper is to investigate the underlying mechanism of the community climate on knowledge-sharing intention in virtual communities. Based on social cognitive theory, a theoretical model was developed and empirically tested using a web-based survey of 525 members from an online question and answer (Q&A) community in China. Results showed that knowledge-sharing self-efficacy and outcome expectation played a chain mediation role in the relationship between the community climate and knowledge-sharing intention. This study is among the first to examine whether and how community climate influences knowledge sharing. Our research findings unpack the mechanism of the community climate on knowledge-sharing intention, and provide practical insights on how to use community climate to facilitate users to share knowledge in online Q&A communities. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. REAL-TIME TROPOSPHERIC PRODUCT ESTABLISHMENT AND ACCURACY ASSESSMENT IN CHINA.
- Author
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Ming Chen, Jiming Guo, Junli Wu, Weiwei Song, and Dong Zhang
- Subjects
TROPOSPHERE ,GLOBAL Positioning System ,MATHEMATICAL models - Abstract
Tropospheric delay has always been an important issue in Global Navigation Satellite System (GNSS) processing. Empirical tropospheric delay models are difficult to simulate complex and volatile atmospheric environments, resulting in poor accuracy of the empirical model and difficulty in meeting precise positioning demand. In recent years, some scholars proposed to establish real-time tropospheric product by using real-time or near-real-time GNSS observations in a small region, and achieved some good results. This paper uses real-time observing data of 210 Chinese national GNSS reference stations to estimate the tropospheric delay, and establishes ZWD grid model in the country wide. In order to analyze the influence of tropospheric grid product on wide-area real-time PPP, this paper compares the method of taking ZWD grid product as a constraint with the model correction method. The results show that the ZWD grid product estimated based on the national reference stations can improve PPP accuracy and convergence speed. The accuracy in the north(N), east(E) and up(U) direction increase by 31.8%,15.6% and 38.3%, respectively. As with the convergence speed, the accuracy of U direction experiences the most improvement. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
50. Urban stormwater inundation simulation based on SWMM and diffusive overland-flow model.
- Author
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Wenjie Chen, Han Zhang, and Guoru Huang
- Subjects
- *
URBAN runoff , *RUNOFF models , *FLOOD control , *GEOGRAPHIC information systems , *STORM drains , *URBAN runoff management , *URBANIZATION & the environment , *MATHEMATICAL models - Abstract
With rapid urbanization, inundation-induced property losses have become more and more severe. Urban inundation modeling is an effective way to reduce these losses. This paper introduces a simplified urban stormwater inundation simulation model based on the United States Environmental Protection Agency Storm Water Management Model (SWMM) and a geographic information system (GIS)-based diffusive overland-flow model. SWMM is applied for computation of flows in storm sewer systems and flooding flows at junctions, while the GIS-based diffusive overland-flow model simulates surface runoff and inundation. One observed rainfall scenario on Haidian Island, Hainan Province, China was chosen to calibrate the model and the other two were used for validation. Comparisons of the model results with field-surveyed data and InfoWorks ICM (Integrated Catchment Modeling) modeled results indicated the inundation model in this paper can provide inundation extents and reasonable inundation depths even in a large study area. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
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