• Title/Summary/Keyword: optimizing

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A Study on the Optimization and Bridge Seismic Response Test of CAFB Using El-centro Seismic Waveforms (El-centro 지진파형을 이용한 CAFB의 최적화 및 교량 지진응답실험에 관한 연구)

  • Heo, Gwang Hee;Lee, Chin Ok;Seo, Sang Gu;Park, Jin Yong;Jeon, Joon Ryong
    • Journal of the Earthquake Engineering Society of Korea
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    • v.24 no.2
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    • pp.67-76
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    • 2020

  • This study aims to optimize the cochlea-inspired artificial filter bank (CAFB) using El-Centro seismic waveforms and test its performance through a shaking table test on a two-span bridge model. In the process of optimizing the CAFB, El-Centro seismic waveforms were used for the purpose of evaluating how they would affect the optimizing process. Next, the optimized CAFB was embedded in the developed wireless-based intelligent data acquisition (IDAQ) system to enable response measurement in real-time. For its performance evaluation to obtain a seismic response in real-time using the optimized CAFB, a two-span bridge (model structures) was installed in a large shaking table, and a seismic response experiment was carried out on it with El-Centro seismic waveforms. The CAFB optimized in this experiment was able to obtain the seismic response in real-time by compressing it using the embedded wireless-based IDAQ system while the obtained compressed signals were compared with the original signal (un-compressed signal). The results of the experiment showed that the compressed signals were superior to the raw signal in response performance, as well as in data compression effect. They also proved that the CAFB was able to compress response signals effectively in real-time even under seismic conditions. Therefore, this paper established that the CAFB optimized by being embedded in the wireless-based IDAQ system was an economical and efficient data compression sensing technology for measuring and monitoring the seismic response in real-time from structures based on the wireless sensor networks (WSNs).

  • https://doi.org/10.5000/EESK.2020.24.2.067 인용 PDF KSCI

Optimizing Path Finding based on Dijkstra's Algorithm for a Quadruped Walking Robot TITAN-VIII (4족보행 로봇 TITAN-VIII의 Dijkstra's Algorithm을 이용한 최적경로 탐색)

  • Nguyen, Van Tien;Ahn, Byong-Won;Bae, Cherl-O
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.23 no.5
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    • pp.574-584
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    • 2017

  • In this paper, the optimizing path finding control method is studied for a Legged-robot. It's named TITAN-VIII. It has a lot of advantages over the wheeled robot in the ability to walk freely on an irregular ground. However, the moving speed on the ground of the Legged-robot is slower than the Wheeled-robot's. Consequently, the purpose of the method is presented in this paper to minimize its time when it walks to a goal. It find the path, our approach is based on an algorithm which is called Dijkstra's algorithm. In the rest of paper, the various posture of the robot is discussed to keep the robot always in the statically stable. Based on above works, the math formulas are presented to determine the joint angles of the robot. After that an algorithm is designed to find and keep robot on the desired trajectory. Experimental results of the proposed method are demonstrated in the last of paper.

  • https://doi.org/10.7837/kosomes.2017.23.5.574 인용 PDF KSCI