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339 results on '"Lv, Bowen"'

38. A Simplified Prediction Method of IoT Service Response Time

Author

Yang, Huaizhou, Lv, Bowen, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Patnaik, Srikanta, editor, and Jain, Vipul, editor

Published
2019
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43. A Differential Signal and Extended-Kalman-Filter-Based Anti-Interference Magnetic Tracking Method for Surgical Scenes

Author

Lv, Bowen, Qin, Yanding, Dai, Houde, and Han, Jianda

Abstract

Magnetic tracking is a promising technique for surgery navigation. However, the magnetic interference (MI) generated in the operating room causes great disturbances to the magnetic tracking system. To attenuate the influence of the MI and improve the tracking performance, this article proposes a differential-based extended Kalman filter (D-EKF) algorithm. Different from conventional algorithms, in the D-EKF, differential units are constructed using the Hamiltonian circle method with the help of a dummy vertex. This helps to attenuate the influence of the MI. Furthermore, an extended Kalman filter is used to estimate the magnet states via the differential signals. The performance of the proposed algorithm is tested in a surgical scene equipped with common surgical instruments and a surgical robot. The experimental results show that the disturbances of MIs can be well attenuated by the proposed algorithm, and high robustness against MI is achieved.

Published
2024
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46. Photodegradation and van der Waals Passivation of Violet Phosphorus.

Author

Zhang, Xiangzhe, Lv, Bowen, Wei, Haitao, Yan, Xingheng, Peng, Gang, and Qin, Shiqiao

Subjects
*PASSIVATION, *PHOTODEGRADATION, *ADSORBATES, *BORON nitride, *SURFACE roughness, *PHOSPHORUS
Abstract

Violet phosphorus (VP), a novel two-dimensional (2D) nanomaterial, boasts structural anisotropy, a tunable optical bandgap, and superior thermal stability compared with its allotropes. Its multifunctionality has sparked widespread interest in the community. Yet, the VP's air susceptibility impedes both probing its intrinsic features and device integration, thus making it of urgent significance to unveil the degradation mechanism. Herein, we conduct a comprehensive study of photoactivated degradation effects on VP. A nitrogen annealing method is presented for the effective elimination of surface adsorbates from VP, as evidenced by a giant surface-roughness improvement from 65.639 nm to 7.09 nm, enabling direct observation of the intrinsic morphology changes induced by photodegradation. Laser illumination demonstrates a significant thickness-thinning effect on VP, manifested in the remarkable morphological changes and the 73% quenching of PL intensity within 160 s, implying its great potential for the efficient selected-area etching of VP at high resolution. Furthermore, van der Waals passivation of VP using 2D hexagonal boron nitride (hBN) was achieved. The hBN-passivated channel exhibited improved surface roughness (0.512 nm), reduced photocurrent hysteresis, and lower responsivity (0.11 A/W @ 450 nm; 2 μW), effectively excluding adsorbate-induced electrical and optoelectrical effects while disabling photodegradation. Based on our experimental results, we conclude that three possible factors contribute to the photodegradation of VP: illumination with photon energy higher than the bandgap, adsorbed H2O, and adsorbed O2. [ABSTRACT FROM AUTHOR]

Published
2024
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