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218 results on '"Zhang, Yuan‐Fang"'

8. What's Wrong with the Bottom-up Methods in Arbitrary-shape Scene Text Detection

Author

Xu, Chengpei, Jia, Wenjing, Cui, Tingcheng, Wang, Ruomei, Zhang, Yuan-fang, and He, Xiangjian

Subjects
Computer Science - Multimedia
Abstract

The latest trend in the bottom-up perspective for arbitrary-shape scene text detection is to reason the links between text segments using Graph Convolutional Network (GCN). Notwithstanding, the performance of the best performing bottom-up method is still inferior to that of the best performing top-down method even with the help of GCN. We argue that this is not mainly caused by the limited feature capturing ability of the text proposal backbone or GCN, but by their failure to make a full use of visual-relational features for suppressing false detection, as well as the sub-optimal route-finding mechanism used for grouping text segments. In this paper, we revitalize the classic text detection frameworks by aggregating the visual-relational features of text with two effective false positive/negative suppression mechanisms. First, dense overlapping text segments depicting the `characterness' and `streamline' of text are generated for further relational reasoning and weakly supervised segment classification. Here, relational graph features are used for suppressing false positives/negatives. Then, to fuse the relational features with visual features, a Location-Aware Transfer (LAT) module is designed to transfer text's relational features into visual compatible features with a Fuse Decoding (FD) module to enhance the representation of text regions for the second step suppression. Finally, a novel multiple-text-map-aware contour-approximation strategy is developed, instead of the widely-used route-finding process. Experiments conducted on five benchmark datasets, i.e., CTW1500, Total-Text, ICDAR2015, MSRA-TD500, and MLT2017 demonstrate that our method outperforms the state-of-the-art performance when being embedded in a classic text detection framework, which revitalises the superb strength of the bottom-up methods., Comment: Accepted by Trans. on Multimedia

Published
2021

9. Multi-material Integrated Printing of Reprogrammable Magnetically Actuated Soft Structure

Author

Zhang, Youchao, Chen, Huangyu, Qiu, Siqi, Zhang, Yuan-Fang, Zhu, Xiaoyang, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Yang, Huayong, editor, Liu, Honghai, editor, Zou, Jun, editor, Yin, Zhouping, editor, Liu, Lianqing, editor, Yang, Geng, editor, Ouyang, Xiaoping, editor, and Wang, Zhiyong, editor

Published
2023
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10. Structural Multi-Colour Invisible Inks with Submicron 4D Printing of Shape Memory Polymers

Author

Zhang, Wang, Wang, Hao, Wang, Hongtao, Chan, John You En, Liu, Hailong, Zhang, Biao, Zhang, Yuan-Fang, Agarwal, Komal, Yang, Xiaolong, Low, Hong Yee, Ge, Qi, and Yang, Joel K. W.

Subjects
Physics - Applied Physics, Physics - Optics
Abstract

Four-dimensional (4D) printing of shape memory polymer (SMP) imparts time responsive properties to 3D structures. Here, we explore 4D printing of a SMP in the submicron length scale, extending its applications to nanophononics. We report a new SMP photoresist based on Vero Clear achieving print features at a resolution of ~300 nm half pitch using two-photon polymerization lithography (TPL). Prints consisting of grids with size-tunable multi-colours enabled the study of shape memory effects to achieve large visual shifts through nanoscale structure deformation. As the nanostructures are flattened, the colours and printed information become invisible. Remarkably, the shape memory effect recovers the original surface morphology of the nanostructures along with its structural colour within seconds of heating above its glass transition temperature. The high-resolution printing and excellent reversibility in both microtopography and optical properties promises a platform for temperature-sensitive labels, information hiding for anti-counterfeiting, and tunable photonic devices.

Published
2020
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22. Effect of pineapple leaf and ramie fiber length and weight percentage on the hybrid polymer composites dry sliding wear and air jet erosion studies.

Author

Arivendan, Ajithram, Chen, Xiaoqi, Zhang, Yuan‐Fang, Gao, Wenhua, and Thangiah, Winowlin Jappes Jebas

Subjects
HYBRID materials, AIR jets, LEAF fibers, MATERIAL erosion, SLIDING wear, AGGLOMERATION (Materials), EROSION, PINEAPPLE, COTTON
Abstract

In this work, pineapple leaf fiber (PALF) and ramie hybrid fiber‐reinforced epoxy composite samples were evaluated for their hardness strength and resistance to dry slide wear and air jet erosion. Primary reinforcement using the hybrid material was chosen from different lengths (10, 15, 20, and 25 mm) and weight percentages (10%, 20%, 30%, 40%, and 50%). The hardness strength of the hybrid composite varied from 74 to 97 Shore D hardness strength. A dry sliding wear test was conducted with the key parameters of load (20, 30, and 40 N), time (20, 10, 7 min), and speed (160, 320, and 479 rpm). By using the data analyzing software, Taguchi optimization method, the key contribution parameters were identified. In the air jet erosion experiment, impact angle (45°, 60°, and 90°), erodent velocity (28, 41, and 72 m/s), and discharge rate (1, 2.5, and 3.3 g/min) parameters were used. Fiber and matrix materials agglomeration effect and bonding behavior were identified by using the scanning electron microscope (SEM) images. The 20 mm length with 30% of the PALF and ramie hybrid fiber‐reinforced composite sample achieved high hardness strength (97 shore D) and created a high resistance toward wear and erosion studies. Highlights: Natural plant pineapple leaf and ramie fibers are mixed with an epoxy matrix.Used Taguchi analysis to determine the means and signal‐to‐noise ratiosDifferent weight percentages of the PALF and ramie hybrid compositesDry sliding wear and air jet erosion studies are conducted.Individual parameter contributions were identified. [ABSTRACT FROM AUTHOR]

Published
2024
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26. The effect of fibre length and content on Aloe veraand ramie fibre-reinforced epoxy hybrid composite properties

Author

Arivendan, Ajithram, Chen, Xiaoqi, Zhang, Yuan-Fang, Sumesh, K. R., Gao, Wenhua, Siva, I., Kavimani, V., Syamani, Firda Aulya, and Thangiah, Winowlin Jappes Jebas

Abstract

This study examines the mechanical properties, characterization studies, wear, and absorption tests of hybrid polymer composites reinforced with Aloe veraand ramie fibres. The hybrid composites were manufactured using a hot press compression moulding machine at 110 °C and 1500 PSI. During composite production, Aloe veraand ramie fibres of varying lengths (10 mm, 15 mm, 20 mm, and 25 mm) and weight percentages (10%, 20%, 30%, 40%, and 50%) were used to fabricate 20 composite samples. To improve the interfacial bonding between the two fibres and epoxy matrix and to attain highest mechanical strength for the medium density fibre, board applications are the main objective of this work. Taguchi optimization was utilized to optimize the wear studies of Aloe veraand ramie fibre–reinforced hybrid composite samples. The optimum fibre length and weight percentage were calculated using a contour plot, with the assistance of MINITAB 17 software. Additionally, absorption studies were conducted to reveal the hydrophilic and hydrophobic characteristics of the hybrid composite sample. The crystallinity index percentage was found to range from 42 to 54% in the characterization studies. The functional group of the hybrid polymer composites was identified using the Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) characterization technique. Additionally, scanning electron microscope (SEM) studies revealed the presence of fibre cracks, gaps, and voids between the primary and secondary phases of the hybrid composite.

Published
2024
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27. Combining the pineapple leaf fibre (PALF) and industrial ramie fibre to the epoxy matrix for high-strength light weight medium-density fibreboards

Author

Arivendan, Ajithram, KR, Sumesh, Chen, Xiaoqi, Zhang, Yuan-Fang, Gao, Wenhua, Syamani, Firda Aulya, and Thangiah, Winowlin Jappes Jebas

Abstract

In this research work, the mechanical properties, characterization studies, and absorption studies of ramie and pineapple leaf fibre (PALF)–reinforced epoxy hybrid polymer matrix composites are examined. A hot press compression moulding machine was used to produce the hybrid composites. Different lengths (10 mm, 15 mm, 20 mm, and 25 mm) and different weight percentages (10%, 20%, 30%, 40%, and 50%) of ramie and PALF fibres are used during composite production. Tensile strength improved from 24.14 to 36.54 MPa, flexural strength improved from 29.46 to 48.18 MPa, and impact strength improved from 1.25 to 4.5 J. The Taguchi optimization technique was used to optimize the mechanical strength of the ramie and PALF hybrid composite samples. A contour plot was used to determine the optimum fibre length and fibre weight percentage. The Taguchi optimization mean plot, SN ratio plot, and contour plots clearly denote the optimum (larger strength is better) composite sample with respective length (20 mm) and weight percentage (30%). Absorption studies indicated the hydrophilic and hydrophobic nature of the hybrid composite sample. The 30% of the PALF and ramie hybrid composites improved the absorption behaviour by up to 12%. Crystallinity index percentage varied between 44 and 56% according to the characterization studies. The FTIR method was used to identify the essential functional group in hybrid polymer composites. SEM studies identify fibre cracks, gaps, and voids between the hybrid composite’s primary and secondary phases.

Published
2024
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33. Directly Printed Embedded Metal Mesh for Flexible Transparent Electrode via Liquid Substrate Electric‐Field‐Driven Jet (Adv. Sci. 14/2022)

Author

Li, Zhenghao, primary, Li, Hongke, additional, Zhu, Xiaoyang, additional, Peng, Zilong, additional, Zhang, Guangming, additional, Yang, Jianjun, additional, Wang, Fei, additional, Zhang, Yuan‐Fang, additional, Sun, Luanfa, additional, Wang, Rui, additional, Zhang, Jinbao, additional, Yang, Zhongming, additional, Yi, Hao, additional, and Lan, Hongbo, additional

Published
2022
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35. 3D Printed High Performance Silver Mesh for Transparent Glass Heaters through Liquid Sacrificial Substrate Electric‐Field‐Driven Jet (Small 17/2022)

Author

Li, Hongke, primary, Li, Zhenghao, additional, Li, Na, additional, Zhu, Xiaoyang, additional, Zhang, Yuan‐Fang, additional, Sun, Luanfa, additional, Wang, Rui, additional, Zhang, Jinbao, additional, Yang, Zhongming, additional, Yi, Hao, additional, Xu, Xiaofeng, additional, and Lan, Hongbo, additional

Published
2022
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39. Carbon Nanotube‐Based Strain Sensors: Structures, Fabrication, and Applications.

Author

Wang, Rui, Sun, Luanfa, Zhu, Xiaoyang, Ge, Wensong, Li, Hongke, Li, Zhenghao, Zhang, Houchao, Huang, Youqi, Li, Zengcheng, Zhang, Yuan‐Fang, Zhao, Jiawei, Xu, Quan, and Lan, Hongbo

Subjects
STRAIN sensors, CARBON nanotubes, QUANTUM tunneling, CHEMICAL vapor deposition, SOFT robotics, HUMAN-computer interaction
Abstract

Flexible strain sensors have received widespread attention because of their great potential in many fields. Carbon nanotubes (CNTs) have been used as conductive materials for flexible strain sensors due to their excellent electrical and mechanical properties, and the fabricated flexible strain sensors have excellent sensing performance. This paper systematically summarizes the advances in flexible resistance‐type strain sensors based on CNTs. The strain sensing mechanisms are introduced, including crack extension, tunneling effect, and disconnection of overlapping materials. The performance parameters of the sensors, including sensitivity, stretchability, linearity, hysteresis, dynamic durability, and transparency, are discussed comprehensively. The coating methods, 3D printing techniques, chemical vapor deposition, transfer methods, and spinning processes used to fabricate CNT strain sensors are highlighted. The effect of isolated and porous internal conductive structures, folded and microcracked surface structures, films and fabrics macroscopic structures on sensor performance were systematically analyzed. The applications of the sensors in medical health, motion monitoring, gesture recognition, human–computer interaction, and soft robotics are provided in detail. Finally, the future challenges of CNT flexible strain sensors are summarized and the outlook is presented. Although CNT strain sensors have made great progress so far, there are still many problems that need researchers' attention and solutions. [ABSTRACT FROM AUTHOR]

Published
2023
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42. 3D Printing of a PDMS Cylindrical Microlens Array with 100% Fill-Factor

Author

Zhang, Houchao, primary, Qi, Tianyu, additional, Zhu, Xiaoyang, additional, Zhou, Longjian, additional, Li, Zhenghao, additional, Zhang, Yuan-Fang, additional, Yang, Wenchao, additional, Yang, Jianjun, additional, Peng, Zilong, additional, Zhang, Guangming, additional, Wang, Fei, additional, Guo, Pengfei, additional, and Lan, Hongbo, additional

Published
2021
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44. Shape‐Memory Polymers: Mechanically Robust and UV‐Curable Shape‐Memory Polymers for Digital Light Processing Based 4D Printing (Adv. Mater. 27/2021)

Author

Zhang, Biao, primary, Li, Honggeng, additional, Cheng, Jianxiang, additional, Ye, Haitao, additional, Sakhaei, Amir Hosein, additional, Yuan, Chao, additional, Rao, Ping, additional, Zhang, Yuan‐Fang, additional, Chen, Zhe, additional, Wang, Rong, additional, He, Xiangnan, additional, Liu, Ji, additional, Xiao, Rui, additional, Qu, Shaoxing, additional, and Ge, Qi, additional

Published
2021
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46. Mechanically Robust and UV‐Curable Shape‐Memory Polymers for Digital Light Processing Based 4D Printing

Author

Zhang, Biao, primary, Li, Honggeng, additional, Cheng, Jianxiang, additional, Ye, Haitao, additional, Sakhaei, Amir Hosein, additional, Yuan, Chao, additional, Rao, Ping, additional, Zhang, Yuan‐Fang, additional, Chen, Zhe, additional, Wang, Rong, additional, He, Xiangnan, additional, Liu, Ji, additional, Xiao, Rui, additional, Qu, Shaoxing, additional, and Ge, Qi, additional

Published
2021
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47. Transparent Electrodes: Templateless, Plating‐Free Fabrication of Flexible Transparent Electrodes with Embedded Silver Mesh by Electric‐Field‐Driven Microscale 3D Printing and Hybrid Hot Embossing (Adv. Mater. 21/2021)

Author

Zhu, Xiaoyang, primary, Liu, Mingyang, additional, Qi, Ximeng, additional, Li, Hongke, additional, Zhang, Yuan‐Fang, additional, Li, Zhenghao, additional, Peng, Zilong, additional, Yang, Jianjun, additional, Qian, Lei, additional, Xu, Quan, additional, Gou, Nairui, additional, He, Jiankang, additional, Li, Dichen, additional, and Lan, Hongbo, additional

Published
2021
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49. Templateless, Plating‐Free Fabrication of Flexible Transparent Electrodes with Embedded Silver Mesh by Electric‐Field‐Driven Microscale 3D Printing and Hybrid Hot Embossing

Author

Zhu, Xiaoyang, primary, Liu, Mingyang, additional, Qi, Ximeng, additional, Li, Hongke, additional, Zhang, Yuan‐Fang, additional, Li, Zhenghao, additional, Peng, Zilong, additional, Yang, Jianjun, additional, Qian, Lei, additional, Xu, Quan, additional, Gou, Nairui, additional, He, Jiankang, additional, Li, Dichen, additional, and Lan, Hongbo, additional

Published
2021
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