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RISS 인기검색어
- 검색키워드
- 저자 : Duan Weiwei (검색결과 4 건)
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Non-linear Cost-sensitive Decision Tree for Multi-classification
Weiwei Duan,Cheng Ding 보안공학연구지원센터(IJSEIA) 2016 International Journal of Software Engineering and Vol.10 No.2
The motivation of this paper is based on a hypothesis that non-linear decision nodes provide a better classification performance than axis-parallel decision nodes do in many practical problems, such as image classification, and voice classification. The algorithm – MNCS_DT is introduced in this paper to create non-linear splits nodes by novel discriminant analysis in decision tree for multi-classification problem and take cost-sensitive problem into account when the features are selected. In experiment part, we use four UCI data sets to compare the performance of MNCS_DT and C4.5 CS by costs and error rates. The performance of MNCS_DT is better than C4.5 CS. And eight data sets from UCI are used to compare the performance of three different feature sets measured by accuracy, G-mean, and operation time. The performance of feature set consisting of features that follow multivariate normal distribution and altered information gain values higher than average one is better than two other feature sets in most data sets.
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Static Performance and Elastic Buckling Analysis of Stiffened Plates with Flat Flanges
Chengzhong Gui,Junqing Lei,Weiwei Lin,Chaoyi Xia,Zhi Duan 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
The present work investigates the static performance and stability of the thin-walled plates with fl at stiff eners under uniform compression. An experiment was fi rst performed to investigate the eff ects of the steel thin-walled box beam-column with intermediate fl at stiff eners on the static performance and stability. The test proved that the external fl ange could enhance the static load-carrying capacity, but the external fl ange’s local buckling predominantly aff ects the members’ buckling performance. The theoretical solution of the stiff ened plates can be focused on improving the buckling performance. The ideal formula for calculating the stiff ened fl ange’s elastic buckling coeffi cient with three simply-supported edges and one stiff ened edge is derived based on the potential energy method. The elastic constraint coeffi cients between the stiff ener and the stiff ened plate are also introduced and fi tted by regression with the 95% confi dence interval’s verifi cation to consider the eff ects of the boundary condition and double-sided arrangement of the stiff eners. The eff ects of the stiff ness ratio between the stiff eners and the stiff ened plates and the geometry parameters of the stiff ened plates and the stiff eners on the buckling coeffi cients have been analyzed. Based on the results, the simplifi ed equations suitable for determining the buckling coeffi cients for the plates with the four simply-supported edges, and the three simply-supported edges, and one free/elastic stiff ened edge, are also suggested. Research shows that the calculating results of the modifi ed equations are in good agreement with that of the fi nite element method, which is also applicable to the stiff ened fl ange without stiff eners.
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Zhang, Xiuling,Xu, Weiwei,Duan, Dongzhi,Park, Dong-Wha,Di, Lanbo IEEE 2018 IEEE transactions on plasma science Vol.46 No.8
<P>Atmospheric pressure (AP) oxygen cold plasma was adopted to synthesize Au/TiO<SUB>2</SUB> catalysts with the assistance of a simple modified incipient wetness impregnation process. Discharge voltages of 25.0, 29.0, and 35.0 kV and discharge time of 1, 2, and 4 min are selected to investigate the effects of discharge voltage and discharge time on the property of the Au/TiO<SUB>2</SUB> catalysts. The results of carbon monoxide (CO) oxidation activity testing show that AP oxygen cold plasma is beneficial to enhance the activity of the Au/TiO<SUB>2</SUB> catalysts, and the optimal discharge voltage and time are 29.0 kV and 1 min, respectively. CO conversion of the Au/TiO<SUB>2</SUB>-29-1 catalyst at 30 °C is 1.42 times as that of the Au/TiO<SUB>2</SUB>-As catalyst without plasma treatment. The UV-Vis diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy characterizations indicate that AP oxygen cold plasma not only can decompose the gold species formed by the modified impregnation process to form metallic gold species but also can remove some of the oxygen species on the surface of the TiO<SUB>2</SUB> support. The discharge time of 1 min at 29.0 kV is enough to decompose the gold species formed by the modified impregnation process, and to keep much active hydroxyl groups. Moreover, there is little difference in the size of gold nanoparticles in the Au/TiO<SUB>2</SUB> catalysts. Therefore, Au/TiO<SUB>2</SUB>-29-1 catalyst exhibits higher CO oxidation activity than Au/TiO<SUB>2</SUB>-As, and 1 min is the optimal discharge time. Thanks to the AP oxygen cold plasma method, high-performance Au/TiO<SUB>2</SUB> catalysts can be synthesized simply in a short time.</P>
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The durability and rehabilitation technologies of concrete sewerage pipes: A state-of-the-art review
Zhuge Yan,Fan Wei,Duan Weiwei,Liu Yue 아시아콘크리트학회 2021 Journal of Asian Concrete Federation Vol.7 No.2
This paper reviews the literature available on the subject of the durability of concrete sewer pipes and the corresponding rehabilitation technologies. An introduction related to the importance of the sewer system in urban life and its durability issues was first discussed as most people did not recognise the scale and complexity of the underground sewer system. Then the recent development of alternative binder materials or filler materials to improve the acid resistance of concrete was specified. For instance, the effects of alternative binders on the hydration products and the mechanism of biogenic corrosion were discussed in detail. The paper ends with the current rehabilitation technologies and the structural performance of rehabilitated sewer pipes. Also, some suggestions associated with future research were made.
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