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Qimeng Liu,Xiaofeng Du,Shuxin Zhao,Jian Liu,Jinfa Cai 서울대학교 교육연구소 2019 Asia Pacific Education Review Vol.20 No.3
This study examined over 48,000 eighth-grade Chinese students’ mathematics performance and use of learning strategies. In particular, this study explored how the use of learning strategies and their combinations are related to students’ mathematics performance in Chinese context. This study examined three kinds of learning strategies derived from the Programme for International Student Assessment (PISA) 2012: memorization, elaboration, and control. The findings indicate that few students chose the memorization strategy as their predominant way of learning mathematics. Instead, students usually chose a combination of learning strategies. The choice of combinations of learning strategies was highly correlated with students’ mathematics performance. Students who chose control strategies outperformed those who chose memorization strategies or elaboration strategies. This study also examined the relationship between learning strategy use and mathematics performance of students who were only children (students with no siblings, born under the “one child” policy) and students living in nonagricultural residential locations (hukou status), both of which are background variables unique to Chinese context. The findings indicate that only-child and nonagricultural students outperformed non-only-child and agricultural students when choosing the same learning strategies. However, those who chose control-dominant strategies performed better than those who chose memorization-dominant strategies, regardless of their background. This study provides a new lens for considering the relationship between learning strategy use and mathematics performance, demonstrating that various learning strategies should be considered together rather than separately.
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The Compact Pulsed Hadron Source: A Design Perspective
Jie Wei,Huaibi Chen,Cheng Cheng,Qiang Du,Zhe Feng,Xialin Guan,Xiaoxue Han,Tuchen Huang,Renkai Li,Chun K. Loong,Beibei Shao,Chuanxiang Tang,Qingzi Xing,Yigang Yang,Hao Zha,Huayi Zhang,Shuxin Zheng,Bin 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.61
During the past decades, large-scale national neutron sources have been developed in Asia, Europe,and North America. Complementing such efforts, compact hadron beam complexes and neutron sources intended to serve primarily universities and industrial institutes have been proposed,and some have recently been established. Responding to the demand in China for pulsed neutron/proton-beam platforms that are dedicated to fundamental and applied research for users in multiple disciplines from materials characterization to hadron therapy and radiography to accelerator-driven sub-critical reactor systems (ADS) for nuclear waste transmutation, we have initiated the construction of a compact, yet expandable, accelerator complex-the Compact Pulsed Hadron Source (CPHS). It consists of an accelerator front-end (a high-intensity ion source, a 3-MeV radio-frequency quadrupole linac (RFQ), and a 13-MeV drift-tube linac (DTL)), a neutron target station (a beryllium target with solid methane and room-temperature water moderators/reflector),and experimental stations for neutron imaging/radiography, small-angle scattering, and proton irradiation. In the future, the CPHS may also serve as an injector to a ring for proton therapy and radiography or as the front end to an ADS test facility. In this paper, we describe the design of the CPHS technical systems and its intended operation.
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Optimization and experiment of an electrostatic forming membrane reflector in space
Baoyan Duan,Feng Gao,Jingli Du,Shuxin Zhang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
An electrostatic forming membrane reflector with AstroMesh structural support is a new concept for space-borne deployable antennas. A membrane shape-control optimization model is proposed in this study for electrode design to achieve high reflector precision. In thismodel, the electrode number, channel number, and voltages are considered design variables, the membrane reflector precision is an objectivefunction, and the positivity and uniformity of membrane stress are constraints. A technology that combines a gradient method andgenetic algorithm is proposed to solve the optimization model. This technology includes continuous and discrete design variables withdifferent values and dimensions. The validity and effectiveness of the optimization model are demonstrated via the numerical example ofa 5 m membrane reflector and a 0.55 m experimental prototype.
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Resilient Filtering for Delayed Markov Jump Neural Networks via Event-triggered Strategy
Weifeng Xia,Yongmin Li,Zuxin Li,Shuxin Du,Bo Li,Wenbin Chen 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.10
This paper deals with the event triggered filtering problem for a class of delayed discrete-time Markov jump neural networks, where a resilient filter with parameter uncertainties is adopted. The aim of this paper is to design a suitable filter which ensures that the filtering error system is stochastically stable and satisfies a prescribed mixed passivity and H∞ performance. Sufficient conditions for solvability of such a problem are developed. Basedon the obtained conditions, an explicit expression of the desired resilient filter is proposed. Finally, an example is presented to show the usefulness of the proposed scheme.
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