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- 저자 : Yuhao Gao (검색결과 2 건)
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Realization of Mobility-Controlled Flying Router in Information-Centric Networking
Yuhao Gao,Taku Kitagawa,Suyong Eum,Shingo Ata,Masayuki Murata 한국통신학회 2018 Journal of communications and networks Vol.20 No.5
Constructing a large-scale network in outdoor fieldswith wired or wireless antennas involves a huge deployment cost. New devices, called movable routers, are able to realize the networksat a low cost. Recently, a large number of internet of thingsnodes have been deployed into the networks in outdoor fields. Inthe current communication network, users intend to communicatewith devices without knowing where they are, but the currentnetwork still focuses on device locations, complicating configurationand implementation of the network. In this study, we designan architecture called router-movable information-centric networking(RMICN) to realize content-based communication insteadof host-based communication, for facilitating communications betweendisjointed networks using movable routers. We incorporateinformation-centric networking technologies in the design of thesystem for the naming scheme and the strategy layer, enabling devicecontrol over the movable routers, called flying routers. In thesimulation results, we show that RMICN can further reduce the responsetime of content requests compared with delay-tolerant networking. Furthermore, we present a proof-of-concept implementationof the architecture to confirm the feasibility of the design.
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The Method of Aiming towards the Normal Direction for Robotic Drilling
Yuhao Gao,Dan Wu,Yunfei Dong,Xinguo Ma,Ken Chen 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.6
During the robotic drilling of an aircraft assembly, the normal directions of the workpieces are to be measured to guide the robot by aiming the spindle at the real normal directions of the curved surfaces. This paper describes the development of a method of using four laser displacement sensors to measure the normal direction and the implementation of the proposed method in a robotic drilling system to meet industrial application requirements. First, a novel mechanical structure is introduced to achieve a higher installation accuracy for the laser displacement sensors with a micro adjusting method. Next, the hardware structures and a convenient method of calibrating the sensors are introduced. To accommodate the complexity of the industrial circumstance, a procedure of measuring and adjusting is developed with consideration of both an angular deviation threshold and a limited adjusting iteration. Finally, the experiments of measuring and adjusting iteratively show that two iterations can achieve a satisfactory angular deviation of 0.1° for planar workpieces and three iterations are required for curved workpieces, with the perpendicularity errors of the drilled holes being less than 0.3°. The results can meet the required perpendicularity accuracy of 0.5°.
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