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Conceptual design for a multi-rotor UAV based on variable paddle pitch
Zhen Qin,Xiaoran Tang,Ziqi Meng,Yu-Ting Wu,류성기,Yue Wang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
The field of unmanned aerial vehicles has experienced a "golden era" of progress in recent years (UAV). UAVs come in a vast variety, from the commercial to the military sectors. The UAVs available today are tiny, mini multirotor devices. The advantages of the small multi-rotor structure are its small size, straightforward design, high hovering effectiveness, adaptability in changing directions, and quick flight speed. For activities like tracking and aerial photography, it is especially useful. However, the majority of multi-rotor UAVs, according to current UAV offers, are built around cameras and sensors. As a result, they can't complete other kinds of missions due to their large overall size, light weight, and small cargoes. The outbreak has sparked interest in and study into whether contactless distribution and logistics are practical. Unmanned mechanical devices for various rescue and specialized duties are also being researched by organizations. Therefore, a medium to big multi-rotor UAV needs to be researched and developed. The assembly of paddle holders and auto-tilters for medium- to large-sized multi-rotor UAVs is examined in this work. The multi-rotor UAV is intended to mount an auto-tilter. Its component strength checks are analyzed. Additionally, the blade requirements are chosen, along with strength tests of the individual components, and the structural design of the UAV rotor system is provided. The mechanical viability of the UAV is then confirmed using a motion simulation of its mechanical design.
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A Method of Finding Hidden Key Users Based on Transfer Entropy in Microblog Network
( Meijuan Yin ),( Xiaonan Liu ),( Gongzhen He ),( Jing Chen ),( Ziqi Tang ),( Bo Zhao ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.8
Finding key users in microblog has been a research hotspot in recent years. There are two kinds of key users: obvious and hidden ones. Influence of the former is direct while that of the latter is indirect. Most of existing methods evaluate user's direct influence, so key users they can find usually obvious ones, and their ability to identify hidden key users is very low as hidden ones exert influence in a very covert way. Consequently, the algorithm of finding hidden key users based on topic transfer entropy, called TTE, is proposed. TTE algorithm believes that hidden key users are those normal users possessing a high covert influence on obvious ones. Firstly, obvious key users are discovered based on microblog propagation scale. Then, based on microblogs' topic similarity and time correlation, the transfer entropy from ordinary users' blogs to obvious key users is calculated and used to measure the covert influence. Finally, hidden influence degrees of ordinary users are comprehensively evaluated by combining above indicators with the influence of both ordinary users and obvious ones. We conducted experiments on Sina Weibo, and the results showed that TTE algorithm had a good ability to identify hidden key users.
ScienceON
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