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37 results on '"Ma, Ziwei"'

2. Class-Specific Attention (CSA) for Time-Series Classification

Author

Hao, Yifan, Cao, Huiping, Candan, K. Selcuk, Liu, Jiefei, Chen, Huiying, and Ma, Ziwei

Subjects
Computer Science - Machine Learning
Abstract

Most neural network-based classifiers extract features using several hidden layers and make predictions at the output layer by utilizing these extracted features. We observe that not all features are equally pronounced in all classes; we call such features class-specific features. Existing models do not fully utilize the class-specific differences in features as they feed all extracted features from the hidden layers equally to the output layers. Recent attention mechanisms allow giving different emphasis (or attention) to different features, but these attention models are themselves class-agnostic. In this paper, we propose a novel class-specific attention (CSA) module to capture significant class-specific features and improve the overall classification performance of time series. The CSA module is designed in a way such that it can be adopted in existing neural network (NN) based models to conduct time series classification. In the experiments, this module is plugged into five start-of-the-art neural network models for time series classification to test its effectiveness by using 40 different real datasets. Extensive experiments show that an NN model embedded with the CSA module can improve the base model in most cases and the accuracy improvement can be up to 42%. Our statistical analysis show that the performance of an NN model embedding the CSA module is better than the base NN model on 67% of MTS and 80% of UTS test cases and is significantly better on 11% of MTS and 13% of UTS test cases., Comment: 12 pages

Published
2022

25. Amphotericin B Tamed by Salicylic Acid

Author

Yu, Yuming, primary, Chen, Peng, additional, Gao, Ming, additional, Lan, Wei, additional, Sun, Shijun, additional, Ma, Ziwei, additional, Sultani, Rome, additional, Cui, Yincang, additional, Umar, Muhammad Naveed, additional, Khan, Sher Wali, additional, Cai, Xiaodong, additional, Liang, Zhenjiang, additional, and Tan, Hui, additional

Published
2022
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28. Synthesis and White-Light Emission of ZnO/HfO2: Eu Nanocables

Author

Liu Lixin, Zhang Hongliang, Wang Yuan, Su Yurong, Ma Ziwei, Xie Yizhu, Zhao Haiting, Chen Changcheng, Liu Yanxia, Guo Xiaosong, Su Qing, and Xie Erqing

Subjects
ZnO, HfO2:Eu, Nanocables, White-light emission, Electrospinning, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Abstract ZnO/HfO2:Eu nanocables were prepared by radio frequency sputtering with electrospun ZnO nanofibers as cores. The well-crystallized ZnO/HfO2:Eu nanocables showed a uniform intact core–shell structure, which consisted of a hexagonal ZnO core and a monoclinic HfO2 shell. The photoluminescence properties of the samples were characterized. A white-light band emission consisted of blue, green, and red emissions was observed in the nanocables. The blue and green emissions can be attributed to the zinc vacancy and oxygen vacancy defects in ZnO/HfO2:Eu nanocables, and the yellow–red emissions are derived from the inner 4f-shell transitions of corresponding Eu3+ ions in HfO2:Eu shells. Enhanced white-light emission was observed in the nanocables. The enhancement of the emission is ascribed to the structural changes after coaxial synthesis.

Published
2010
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37. Synthesis and White-Light Emission of ZnO/HfO2: Eu Nanocables.

Author

Liu, Lixin, Zhang, Hongliang, Wang, Yuan, Su, Yurong, Ma, Ziwei, Xie, Yizhu, Zhao, Haiting, Chen, Changcheng, Liu, Yanxia, Guo, Xiaosong, Su, Qing, and Xie, Erqing

Subjects
LIGHT sources, ZINC oxide, ZINC compounds, PROPERTIES of matter, EUROPIUM isotopes, RADIO waves
Abstract

ZnO/HfO2:Eu nanocables were prepared by radio frequency sputtering with electrospun ZnO nanofibers as cores. The well-crystallized ZnO/HfO2:Eu nanocables showed a uniform intact core–shell structure, which consisted of a hexagonal ZnO core and a monoclinic HfO2 shell. The photoluminescence properties of the samples were characterized. A white-light band emission consisted of blue, green, and red emissions was observed in the nanocables. The blue and green emissions can be attributed to the zinc vacancy and oxygen vacancy defects in ZnO/HfO2:Eu nanocables, and the yellow–red emissions are derived from the inner 4f-shell transitions of corresponding Eu3+ ions in HfO2:Eu shells. Enhanced white-light emission was observed in the nanocables. The enhancement of the emission is ascribed to the structural changes after coaxial synthesis. [ABSTRACT FROM AUTHOR]

Published
2010
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