Search results
1 – 10 of 468Abstract
Purpose
Coastal zone ecological restoration project is of great significance to alleviate marine ecological degradation. Evaluating the effect of coastal ecological restoration projects and identifying the obstacle factors affecting their restoration level can provide an empirical basis for future Marine ecological restoration projects.
Design/methodology/approach
However, due to the initial stage of coastal zone ecological restoration projects, the actual monitoring data of coastal zone ecological restoration is relatively lacking. Based on the CRITIC-TOPSIS (combination of CRITIC method and TOPSIS method) method, combined with the subjective perception of the public and the actual data of the restoration project, this paper proposes an evaluation method of the coastal zone ecological restoration effect to obtain the specific implementation effect of the coastal zone ecological restoration project. The main obstacle factors affecting the evaluation of coastal ecological restoration effect are identified by using the obstacle degree model.
Findings
This paper conducted an empirical study on the restoration of sandy shoreline and coastal wetland in Qinhuangdao city. Based on the data of restoration projects and the subjective perception of ecological restoration by the public in Qinhuangdao city, the research results showed that the coastal zone ecological restoration effect of Qinhuangdao city was general. The quality of the restoration project and the public perception have an important influence on the evaluation of the restoration effect. Improving the quality of the restoration project, strengthening the public's participation in ecological restoration and allowing the public to better participate in the ecological restoration of the coastal zone can improve the effect of ecological restoration of the coastal zone in an all-round way.
Originality/value
The research results of this paper have a guiding role in the ecological restoration of coastal cities in the future, and also have a demonstration and reference role for the assessment of the effect of ecological restoration of coastal zones.
Details
Keywords
Kedong Yin, Tongtong Xu, Xuemei Li and Yun Cao
This paper aims to deal with the grey relational problem of panel data with an attribute value of interval numbers. The grey relational model of interval number for panel data is…
Abstract
Purpose
This paper aims to deal with the grey relational problem of panel data with an attribute value of interval numbers. The grey relational model of interval number for panel data is constructed in this paper.
Design/methodology/approach
First, three kinds of interval grey relational operators for the behavior sequence of a dimensionless system are proposed. At the same time, the positive treatment method of interval numbers for cost-type and moderate-type indicators is put forward. On this basis, the correlation between the three-dimensional interval numbers of panel data is converted into the correlation between the two-dimensional interval numbers in time series and cross-sectional dimensions. The grey correlation coefficients of each scheme and the ideal scheme matrix are calculated in the two dimensions, respectively. Finally, the correlation degree of panel interval number and scheme ordering are obtained by arithmetic mean.
Findings
This paper proves that the grey relational model of the panel interval number still has the properties of normalization, uniqueness and proximity. It also avoids the problem that the results are not unique due to the different orders of objects in the panel data.
Practical implications
The effectiveness and practicability of the model is verified by taking supplier selection as an example. In fact, this model can also be widely used in agriculture, industry, society and other fields.
Originality/value
The accuracy of the relational results is higher and more accurate compared with the previous studies.
Details
Keywords
Li Xuemei, Benshuo Yang, Yun Cao, Liyan Zhang, Han Liu, Pengcheng Wang and Xiaomei Qu
China's marine economy occupies an important position within the national economy, and its contribution thereto is constantly improving. The overall operation of the marine…
Abstract
Purpose
China's marine economy occupies an important position within the national economy, and its contribution thereto is constantly improving. The overall operation of the marine economy shows positive developmental trends with potential for further growth. The purpose of this research is to analyse the prosperity of China's marine economy, reveal trends therein and forecast the likely turning point in its operation.
Design/methodology/approach
Based on the periodicity and fluctuation of China's marine economy development, China's marine economic prosperity indicator system is established from five perspectives. On this basis, China's marine economic operation prosperity index can be synthesised and calculated, then a dynamic factor model is constructed. Using the filtering method to calculate China's marine economic operational Stock–Watson index, Markov switching has been used to determine the trend to transition. Furthermore, China's current marine economic prosperity is evaluated through analysis of influencing factors and correlation analysis.
Findings
The analysis shows that, from 2017 to 2019, the operation of the marine economy is relatively stable, and the prosperity index supports this finding; meanwhile it also exposes problems in China's marine economy, such as an unbalanced industrial structure, low marine economic benefits and insufficient capacity for sustainable development.
Originality/value
Through the analysis of the prosperity of China's marine economy, the authors reveal the trends in China's marine economy and forecast its likely future turning point.
Details
Keywords
Li Xuemei, Yun Cao, Junjie Wang, Yaoguo Dang and Yin Kedong
Research on grey systems is becoming more sophisticated, and grey relational and prediction analyses are receiving close review worldwide. Particularly, the application of grey…
Abstract
Purpose
Research on grey systems is becoming more sophisticated, and grey relational and prediction analyses are receiving close review worldwide. Particularly, the application of grey systems in marine economics is gaining importance. The purpose of this paper is to summarize and review literature on grey models, providing new directions in their application in the marine economy.
Design/methodology/approach
This paper organized seminal studies on grey systems published by Chinese core journal database – CNKI, Web of Science and Elsevier from 1982 to 2018. After searching the aforementioned database for the said duration, the authors used the CiteSpace visualization tools to analyze them.
Findings
The authors sorted the studies according to their countries/regions, institutions, keywords and categories using the CiteSpace tool; analyzed current research characteristics on grey models; and discussed their possible applications in marine businesses, economy, scientific research and education, marine environment and disasters. Finally, the authors pointed out the development trend of grey models.
Originality/value
Although researches are combining grey theory with fractals, neural networks, fuzzy theory and other methods, the applications, in terms of scope, have still not met the demand. With the increasingly in-depth research in marine economics and management, international marine economic research has entered a new period of development. Grey theory will certainly attract scholars’ attention, and its role in marine economy and management will gain considerable significance.
Details
Keywords
Kedong Yin, Yun Cao, Shiwei Zhou and Xinman Lv
The purposes of this research are to study the theory and method of multi-attribute index system design and establish a set of systematic, standardized, scientific index systems…
Abstract
Purpose
The purposes of this research are to study the theory and method of multi-attribute index system design and establish a set of systematic, standardized, scientific index systems for the design optimization and inspection process. The research may form the basis for a rational, comprehensive evaluation and provide the most effective way of improving the quality of management decision-making. It is of practical significance to improve the rationality and reliability of the index system and provide standardized, scientific reference standards and theoretical guidance for the design and construction of the index system.
Design/methodology/approach
Using modern methods such as complex networks and machine learning, a system for the quality diagnosis of index data and the classification and stratification of index systems is designed. This guarantees the quality of the index data, realizes the scientific classification and stratification of the index system, reduces the subjectivity and randomness of the design of the index system, enhances its objectivity and rationality and lays a solid foundation for the optimal design of the index system.
Findings
Based on the ideas of statistics, system theory, machine learning and data mining, the focus in the present research is on “data quality diagnosis” and “index classification and stratification” and clarifying the classification standards and data quality characteristics of index data; a data-quality diagnosis system of “data review – data cleaning – data conversion – data inspection” is established. Using a decision tree, explanatory structural model, cluster analysis, K-means clustering and other methods, classification and hierarchical method system of indicators is designed to reduce the redundancy of indicator data and improve the quality of the data used. Finally, the scientific and standardized classification and hierarchical design of the index system can be realized.
Originality/value
The innovative contributions and research value of the paper are reflected in three aspects. First, a method system for index data quality diagnosis is designed, and multi-source data fusion technology is adopted to ensure the quality of multi-source, heterogeneous and mixed-frequency data of the index system. The second is to design a systematic quality-inspection process for missing data based on the systematic thinking of the whole and the individual. Aiming at the accuracy, reliability, and feasibility of the patched data, a quality-inspection method of patched data based on inversion thought and a unified representation method of data fusion based on a tensor model are proposed. The third is to use the modern method of unsupervised learning to classify and stratify the index system, which reduces the subjectivity and randomness of the design of the index system and enhances its objectivity and rationality.
Details
Keywords
Ming Liu, Lei Tan, Yabin Liu, Yun Xu and Shuliang Cao
This paper aims to investigate the effect of three-dimensional (3D) inlet guide vanes (IGVs) on performance of a centrifugal pump.
Abstract
Purpose
This paper aims to investigate the effect of three-dimensional (3D) inlet guide vanes (IGVs) on performance of a centrifugal pump.
Design/methodology/approach
A design method for 3D IGVs is proposed based on the controllable velocity moment, which is determined by a fourth-order dimensionless function. Numerical simulation of the centrifugal pump with IGVs is carried out by solving the Reynolds-averaged Navier–Stokes equations. The method of frozen rotor is applied to couple the stationary and rotational domain.
Findings
The efficiency of pump with 3D IGVs is higher than that with 2D IGVs for most prewhirl angles, which validate the advancement of 3D IGVs on prewhirl regulation. The effect of prewhirl regulation at small flow rate is more significant than that at large flow rate.
Originality/value
A prediction model of velocity moment based on the Oseen vortex is proposed to describe the flow pattern downstream the IGVs.
Details
Keywords
Yun-Fang Tu, Gwo-Jen Hwang, Shu-Yen Chen, Chiulin Lai and Chuan-Miao Chen
This study aims to compare similarities and differences in library and information science (LIS) and non-LIS undergraduates’ conceptions and perceptions of smart libraries via…
Abstract
Purpose
This study aims to compare similarities and differences in library and information science (LIS) and non-LIS undergraduates’ conceptions and perceptions of smart libraries via drawing analysis.
Design/methodology/approach
In this study, a total of 156 undergraduate students described their perceptions of smart libraries as drawings and textual descriptions. A modified coding scheme with 8 categories and 51 subcategories was used to analyse the undergraduate students’ drawings.
Findings
Most of the undergraduate students’ conceptions of smart libraries still involve self-checkout and learning/reading, focusing on information appliances, technical services, activities and objects. The differences are that the LIS undergraduates’ drawings showed smart libraries with robots, interactive book borrowing with technology tools, intelligent services, location-aware services or mobile applications, whereas non-LIS undergraduates presented smart libraries as readers (learners), other activities and no smart technology services. LIS undergraduates focused on providing patron services with technologies. Non-LIS undergraduates were more likely to draw a complex space with immediate access to books or digital resources, quiet reading and the freedom to engage in library activities.
Originality/value
The results provide a baseline for future research on the topic and provide preliminary evidence of using the methods to discern LIS and non-LIS undergraduates’ conceptions of smart libraries.
Details
Keywords
Mu-ming Hao, Wen-jing Yang, Heng-chao Cao, Lu-shuai Xu, Yun-lei Wang and Yong-fan Li
The purpose of this paper is to investigate the dynamic characteristics of a spiral groove liquid film seal considering the effect of cavitation.
Abstract
Purpose
The purpose of this paper is to investigate the dynamic characteristics of a spiral groove liquid film seal considering the effect of cavitation.
Design/methodology/approach
A mathematical model of a spiral groove liquid film seal was established based on the mass-conserving Jakobsson–Floberg–Olsson cavitation boundary condition. The film rupture and film reformation boundaries were assumed to be unchanged under infinitesimal perturbation conditions. Governing equations under steady and perturbed states were solved by the finite element method, and then the dynamic characteristics of the spiral groove liquid film seal were theoretically investigated considering the effect of cavitation.
Findings
The results indicate that dynamic coefficients considering cavitation are smaller than those neglecting cavitation. The difference value is consistent with the change in cavitation area. The liquid film seal does not suffer axial instability whether considering cavitation, but its angular instability is more likely to occur when cavitation is considered.
Originality/value
For liquid lubricated non-contacting mechanical seals, the dynamic characteristics considering cavitation are investigated. The results are expected to provide a theoretical basis for improving the design method of liquid film seals.
Details
Keywords
Hange Yun, Qiaoping Zhang, Wei Cao and Xiaolei Zhang
Teacher noticing is a critical aspect of teaching competence that has garnered significant scholarly attention. This systematic review aims to comprehensively analyze the…
Abstract
Purpose
Teacher noticing is a critical aspect of teaching competence that has garnered significant scholarly attention. This systematic review aims to comprehensively analyze the integration of teacher noticing into lesson study, exploring how different stages of lesson study influence the development of teacher noticing.
Design/methodology/approach
This article systematically reviews 15 empirical studies on teacher noticing within the context of lesson study, focusing on research design, subjects, methods, theoretical frameworks and the specific impact of different stages of lesson study on teacher noticing.
Findings
The review reveals a geographical concentration of studies in Western countries, particularly in the United States, with a relative scarcity of research in East Asian contexts. Most studies focus on pre-service teachers, employ qualitative methods and are grounded in Van Es’s (2011) Learning to Notice framework. The findings indicate that different stages of lesson study significantly influence teacher noticing, particularly in the planning, teaching and reflection stages, where shifts in focus and depth of noticing are evident.
Research limitations/implications
This paper explores how various lesson study stages impact teacher noticing development. It offers future research directions and calls for more cross-cultural studies. Certain activities within classroom research may restrict attention development, particularly when these activities fail to encourage in-depth cognitive analysis across all stages sufficiently. Future research should explore how to avoid these limitations in the classroom research process and design more effective strategies to support deep observation and analysis by teachers at each stage. In the reflection stage of classroom research, certain factors may restrict the focus on student thinking.
Practical implications
By synthesizing the existing research into a comprehensive narrative, we provide an essential foundation for future studies on teacher noticing within lesson study contexts. This work not only charts the historical development of the field but also encourages more profound and actionable research engagement with the nuanced processes of teacher observation and reflection during lesson studies.
Originality/value
This paper explores how various lesson study stages impact teacher noticing development. It offers future research directions and calls for more cross-cultural studies and a combination of quantitative and qualitative methods to fully understand the effects of lesson studies on teacher noticing.
Details
Keywords
Say Sok and Rinna Bunry
This paper aim to argue for Cambodia to take internationalization of higher education seriously and strategically to position it for higher education development, and this starts…
Abstract
Purpose
This paper aim to argue for Cambodia to take internationalization of higher education seriously and strategically to position it for higher education development, and this starts with enhancing its buy-in among the key stakeholders, fine-tuning its conceptualization and contextualization and a government-funded comprehensive policy and investment program.
Design/methodology/approach
This paper explores policies and practices of internationalization in Cambodia, using Knight's (2004, 2007) conceptualization of internationalization and Wan's (2018) list of six dimensions, by which the authors track and measure internationalization.
Findings
Systematic policy implementation to position internationalization to achieve national and institutional goals is little. Given utilitarianism of internationalization, policy statement has geared more toward employing internationalization to achieve institutional building, in order of significance: mobility, research collaboration, policy formulation and quality control, and much less on networking and aligning with international instruments. Subtle differences among the four universities under investigation exist. While all focus on student and faculty mobility and exchange, some aim at research collaboration and networks; some at indigenous “international” and language programs, and some at joint degree programs. But, internationalization is not a key priority nor is it strategically positioned to achieve institutional aspirations.
Practical implications
Without comprehensive, strategic policy guidance and implementation from the government, internationalization has taken its own course, and such is not healthy for higher education development.
Originality/value
There are few studies on internationalization in Cambodia. Clayton and Yuok (1997), Clayton (2002) and Pit and Ford (2004) examine politics or its politicization and higher education development after the end of the Eastern Bloc's support (Tek and Leng, 2017). Recent studies (Leng, 2015; Leng, 2016; Yun, 2014) underline institutional case studies to illustrate status, issues and challenges in internationalization. This article attempts to provide an overarching map of internationalization to inform policies and practices toward higher education and national development.
Details