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26 results on '"He, Sihan"'

1. Fast Extrinsic Calibration for Multiple Inertial Measurement Units in Visual-Inertial System

Author

Yu, Youwei, Liu, Yanqing, Fu, Fengjie, He, Sihan, Zhu, Dongchen, Wang, Lei, Zhang, Xiaolin, and Li, Jiamao

Subjects
Computer Science - Robotics
Abstract

In this paper, we propose a fast extrinsic calibration method for fusing multiple inertial measurement units (MIMU) to improve visual-inertial odometry (VIO) localization accuracy. Currently, data fusion algorithms for MIMU highly depend on the number of inertial sensors. Based on the assumption that extrinsic parameters between inertial sensors are perfectly calibrated, the fusion algorithm provides better localization accuracy with more IMUs, while neglecting the effect of extrinsic calibration error. Our method builds two non-linear least-squares problems to estimate the MIMU relative position and orientation separately, independent of external sensors and inertial noises online estimation. Then we give the general form of the virtual IMU (VIMU) method and propose its propagation on manifold. We perform our method on datasets, our self-made sensor board, and board with different IMUs, validating the superiority of our method over competing methods concerning speed, accuracy, and robustness. In the simulation experiment, we show that only fusing two IMUs with our calibration method to predict motion can rival nine IMUs. Real-world experiments demonstrate better localization accuracy of the VIO integrated with our calibration method and VIMU propagation on manifold.

Published
2024
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6. Recovering the Weights of Convolutional Neural Network via Chosen Pixel Horizontal Power Analysis

Author

He, Sihan, Wu, Weibin, Li, Yanbin, Zhou, Lu, Fang, Liming, Liu, Zhe, 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, Wang, Lei, editor, Segal, Michael, editor, Chen, Jenhui, editor, and Qiu, Tie, editor

Published
2022
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9. Improving Trace Detection of Methylene Blue by Designing Nanowire Array on Boron-Doped Diamond as Electrochemical Electrode.

Author

He, Sihan, Lin, Kun, Cheng, Shaoheng, Gao, Nan, Liu, Junsong, and Li, Hongdong

Subjects
METHYLENE blue, ELECTROCHEMICAL electrodes, DOPING agents (Chemistry), NANOWIRES, CURRENT fluctuations, CHEMICAL vapor deposition, MICROWAVE plasmas
Abstract

In this study, a boron-doped diamond nanowire array (BDD-NWA)-based electrode is prepared by using a microwave plasma chemical vapor deposition system and treated with inductively coupled plasma reactive ion etching. The BDD-NWA electrode is used for trace detection of methylene blue, which has a wide linear range of 0.04–10 μM and a low detection limit of 0.72 nM. Both the superhydrophilicity (contact angle ~0°) and the dense nanowire array's structure after the etching process improve the sensitivity of the electrochemical detection compared to the pristine BDD. In addition, the electrode shows great repeatability (peak current fluctuation range of −3.3% to 2.9% for five detection/cleaning cycles) and stability (peak current fluctuation range of −5.3% to 6.3% after boiling) due to the unique properties of diamonds (mechanical and chemical stability). Moreover, the BDD-NWA electrode achieves satisfactory recoveries (93.8%–107.5%) and real-time monitoring in tap water. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Influence of Auricularia cornea Polysaccharide Coating on the Stability and Antioxidant Activity of Liposomes Ginsenoside Rh2.

Author

Wang, Minghui, Li, Qinyang, Li, Shuang, Zhao, Yunzhu, Jiang, Xintong, He, Sihan, and Liu, Junmei

Subjects
GINSENOSIDES, LIPOSOMES, SURFACE coatings, TRANSMISSION electron microscopy, POLYSACCHARIDES, GASTROINTESTINAL system, CHITOSAN
Abstract

Liposomes (Lip) are microstructures containing lipid and aqueous phases for encapsulation and delivery of bioactivators. In this study, Ginsenoside Rh2 liposomes (Rh2−Lip) were prepared by a thin-film hydrated ultrasonic binding method. But they are not stable during storage. In addition, Rh2−Lip was wrapped with Auricultural cornea polysaccharide (ACP) and Chitosan (CS) as coating materials to improve stability. CS coating was used as a positive control. The particle sizes determined by dynamic light scattering (DLS) showed 183 ± 5.52 nm for liposomes, 197 ± 6.7 nm for Auricultural cornea polysaccharide coated liposomes (ACP−Rh2−Lip), and 198 ± 3.5 nm for Chitosan coated liposomes (CS−Rh2−Lip). The polydispersity index (PDI) of all liposomes was less than 0.3. Transmission electron microscopy (TEM) showed that ACP and CS were successfully encapsulated on the liposome surface. In vitro simulations of digestive stability in the gastrointestinal tract showed that ACP−Rh2−Lip and CS−Rh2−Lip were more stable in gastrointestinal fluids compared to Lip. The antioxidant experiment revealed that ACP−Rh2−Lip has greater antioxidant activity than Lip. The purpose of this study was to look into the effects of ACP−Rh2−Lip and to offer a reference for Ginsenoside Rh2 (Rh2) delivery. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Bio-inspired lightweight pulp foams with improved mechanical property and flame retardancy via borate cross-linking

Author

Yuedong Zhang, He Sihan, Xuewen Chi, Bin Li, Haisong Wang, Hui Peng, Guang Yu, and Chao Liu

Subjects
Materials science, Fabrication, General Chemical Engineering, chemistry.chemical_element, 02 engineering and technology, engineering.material, 010402 general chemistry, 01 natural sciences, Industrial and Manufacturing Engineering, chemistry.chemical_compound, Thermal conductivity, Thermal insulation, Environmental Chemistry, Cellulose, Composite material, Boron, Porosity, Structural material, business.industry, Pulp (paper), General Chemistry, 021001 nanoscience & nanotechnology, 0104 chemical sciences, chemistry, engineering, 0210 nano-technology, business
Abstract

The ultra-lightweight and porous cellulose foam can be used in a broad range of applications (e.g. structural materials, sound insulation, thermal insulation), but the demands for high strength and fire-retardant properties are still challenges for the end uses. In this work, inspired by the cross-linking function of borate in plants, a lightweight and highly porous pulp foam with improved mechanical properties and flame retardancy was simply prepared via borate cross-linking. It was found that the prepared pulp foams had low density in the range of 13.3–16.4 mg/cm3, high porosity (>98%), and high compressional strength (up to 74.1 kPa, which was 28 times higher than that of pristine foam without borate). More interestingly, the pulp foam could be repeatedly squeezed more than 10 times without failure of its 3D structure. Compared with the readily flammable pristine pulp foam, the resultant pulp foams containing boron with low thermal conductivity (about 0.045 W/(m·K)) showed improved flame-retardant properties and excellent self-extinguishing behavior. When the content of boron was 3.45 wt%, the resultant pulp foam was completely incombustible. Therefore, this study provides a cost-effective and facile route for the fabrication of high-strength and porous pulp foams with excellent flame-resistance and heat insulation properties.

Published
2019

26. Exploring public sentiment during COVID-19: a cross country analysis

Author

Shuo Yu, Mehdi Naseriparsa, Ivan Lee, Zhen Cai, Feng Xia, Sihan He, Yu, Shuo, He, Sihan, Cai, Zhen, Lee, Ivan, Naseriparsa, Mehdi, and Xia, Feng

Subjects
Human-Computer Interaction, social media, social networking (online), policy-making, Modeling and Simulation, sentiment analysis, Australia, COVID-19, national difference, pandemics, blogs, semantics, Social Sciences (miscellaneous)
Abstract

COVID-19 has spread all over the world, accounting for countless death and enormous economic loss. Since the World Health Organization (WHO) declared COVID-19 as a pandemic, governments from different countries have made various policies to prevent the pandemic from becoming worse. However, civilian reactions to the pandemic vary when they face similar situations. This behavioral variation creates a challenge when it comes to policy-making. Such differences are generally implicit, hidden in ones' social lives. As a result, it is challenging to analyze such differences when the governments make policies. In this work, we investigate social media posts on Twitter and Weibo in order to effectively explore the difference in reactions across various countries, with the aim to understand national differences. To this end, we employ natural language processing (NLP) methods and Linguistic Inquiry and Word Count (LIWC) tools to process six languages in different countries, including the USA, Germany, France, Italy, the U.K., and China. We provide a comprehensive analysis of public reaction differences from the emotional perspective. Our findings verify that the reactions vary noticeably among various countries for some policies. Therefore, sentiment analysis can significantly influence policy-making. Our work sheds light on the mechanism of detecting the reaction differences in various countries, which can be utilized to conduct effective communication and make appropriate policy decisions Refereed/Peer-reviewed

Published
2022

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