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Lianchun Dong,Wee Tiong Seah,Yiming Cao,David Clarke 서울대학교 교육연구소 2019 Asia Pacific Education Review Vol.20 No.3
This study aims to reveal features of student talk over a sequence of consecutive mathematics lessons in a large-size class in mainland China. By examining the time allocation for student talk and the number of Chinese characters spoken by the students, this study finds that, in some of the lessons observed, student talk added up to a longer duration and included a larger number of Chinese characters than teacher talk. But individual students were observed to have unequal opportunities to participate in public talk and there is a large gap regarding the number of Chinese characters that an individual student could speak in public. Each individual student’s accountability to talk was recorded to be less diverse in public presentation than in non-presentation contexts (e.g., answering teacher questions). This study suggests that a unit of consecutive lessons can help a clearer and more comprehensive observation and analysis of student talk.
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Researches on the Prototype Implementation of Visual Data Mining Techniques
Guiliang Feng,Zhonghua Li,LianChun Zhang 보안공학연구지원센터 2014 International Journal of Database Theory and Appli Vol.7 No.6
This paper describes the core functional components and a visualization module implementation process of visual data mining technology prototype system. The first part introduces the implementation technology of visual data mining technology prototype system and then describes the overall design of the architecture and features of visual data mining technology prototype system; Then paper describes the common components in the visualization of data mining technology prototype system. Research achievements of this article provides a useful reference to optimize visual data mining techniques.
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Equivalent homogenization design method for stretching-bending hybrid lattice structures
Hui Liu,Lianchun Long 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8
An efficient and accurate equivalent design method for hybrid lattice structures is proposed. First, the equivalent mechanical properties of the lattice structures are calculated, including the equivalent elastic modulus, shear modulus, and Poisson’s ratio. We construct an effective and simple stretching-bending hybrid lattice structure, which uses two types of lattice structures: stretching-dominated lattice structure and bending-dominated lattice structure. The optimal material density distributions are obtained via topological optimization by taking threepoint bending beams and L-shaped beams as examples. The optimized stretching-bending hybrid lattice structures are designed based on the equivalent properties of the lattice structures. The same relative density uniform lattice structure is constructed while being compared with the stretching-bending hybrid lattice structure. The corresponding equivalent homogenization model and accurate beam model are established for comparison and verification by finite element analysis. Results show that the hybrid lattice structure has higher stiffness than the uniform lattice structure with the same relative density. The equivalent homogenized model of a hybrid lattice structure can effectively characterize the mechanical properties of the structure and improve design efficiency.
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Jing Zhao,Zhandi Wang,Rong Jiao,Qionglian Wan,Lianchun Wang,Liangxing Li,Yali Yang,Shahzad Munir The Korean Society of Ginseng 2024 Journal of Ginseng Research Vol.48 No.2
Background: Plant health is directly related to the change in native microbial diversity and changes in soil health have been implicated as one of the main cause of root rot. However, scarce information is present regarding allelopathic relationship of Panax notoginseng root exudates and pathogenic fungi Fusarium oxysporum in a continuous cropping system. Methods: We analyzed P. notoginseng root exudate in the planting soil for three successive years to determine phenolic acid concentration using GC-MS and HPLC followed by effect on the microbial community assembly. Antioxidant enzymes were checked in the roots to confirm possible resistance in P. notoginseng. Results: Total 29 allelochemicals in the planting soil extract was found with highest concentration (10.54 %) of p-hydroxybenzoic acid. The HPLC showing a year-by-year decrease in p-hydroxybenzoic acid content in soil of different planting years, and an increase in population of F. oxysporum. Moreover, community analysis displayed negative correlation with 2.22 mmol. L<sup>-1</sup> of p-hydroxybenzoic acid correspond to an 18.1 % population of F. oxysporum. Furthermore, in vitro plate assay indicates that medium dose of p-hydroxybenzoic acid (2.5-5 mmol. L<sup>-1</sup>) can stimulate the growth of F. oxysporum colonies and the production of macroconidia, as well as cell wall-degrading enzymes. We found that 2-3 mmol. L<sup>-1</sup> of p-hydroxybenzoic acid significantly increased the population of F. oxysporum. Conclusion: In conclusion, our study suggested that p-hydroxybenzoic acid have negative effect on the root system and modified the rhizosphere microbiome so that the host plant became more susceptible to root rot disease.
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