• 제목/요약/키워드: Arnold

검색결과 117건 처리시간 0.035초

Obstacle Avoidance Methods in the Chaotic Mobile Robot with Integrated some Chaos Equation

  • Bae, Young-Chul;Kim, Ju-Wan;Kim, Yi-Gon
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • 제3권2호
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    • pp.206-214
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    • 2003
  • In this paper, we propose a method to avoid obstacles that have unstable limit cycles in a chaos trajectory surface. We assume all obstacles in the chaos trajectory surface have a Van der Pol equation with an unstable limit cycle. When a chaos robot meets an obstacle in an Arnold equation or Chua's equation trajectory, the obstacle reflects the robot. We also show computer simulation results of Arnold equation and Chua's equation and random walk chaos trajectories with one or more Van der Pol obstacles and compare the coverage rates of each trajectory. We show that the Chua's equation is slightly more efficient in coverage rates when two robots are used, and the optimal number of robots in either the Arnold equation or the Chua's equation is also examined.

Data Hiding Algorithm for Images Using Discrete Wavelet Transform and Arnold Transform

  • Kasana, Geeta;Singh, Kulbir;Bhatia, Satvinder Singh
    • Journal of Information Processing Systems
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    • 제13권5호
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    • pp.1331-1344
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    • 2017
  • In this paper, data hiding algorithm using Discrete Wavelet Transform (DWT) and Arnold Transform is proposed. The secret data is scrambled using Arnold Transform to make it secure. Wavelet subbands of a cover image are obtained using DWT. The scrambled secret data is embedded into significant wavelet coefficients of subbands of a cover image. The proposed algorithm is robust to a variety of attacks like JPEG and JPEG2000 compression, image cropping and median filtering. Experimental results show that the PSNR of the composite image is 1.05 dB higher than the PSNR of existing algorithms and capacity is 25% higher than the capacity of existing algorithms.

chaotic behavior analysis in the mobile robot : the case of Arnold equation

  • Kim, Youngchul;Kim, Juwan;Kim, Yigon
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2003년도 추계 학술대회 학술발표 논문집
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    • pp.110-113
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    • 2003
  • In this paper, we propose that the chaotic behavior analysis in the mobile robot of embedding Arnold equation with obstacle. In order to analysis of chaotic behavior in the mobile robot, we apply not only qualitative analysis such as time-series, embedding phase plane, but also quantitative analysis such as Lyapunov exponent in the mobile robot with obstacle. In the obstacle, we only assume that all obstacles in the chaos trajectory surface in which robot workspace has an unstable limit cycle with Van der Pol equation.

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原子吸光分析에 의한 鋼鐵속에 있는 Cr, Mn 및 Ni 의 定量 (Atomic Absorption Spectrophotometric Analysis of Chromium, Nickel and Manganese in Stainless Steel)

  • 황재영
    • 대한화학회지
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    • 제10권3호
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    • pp.133-135
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    • 1966
  • Stainless steel 속에 들어 있는 chromium, nickel, 및 manganess를 原子吸光分光分析法(atomic absorption spectrophotomer)으로써 보다 빨리 定量할 수 있는 方法을 記述하였다. 現行되고 있는 濕式分析法과 比較한 結果 原子吸光分光分析法도 stainless steel의 分析에 믿을만한 한가지 分析法임을 알게 되었다.

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선형계수확장 기반의 새로운 웨이블릿 워터마킹 (A New Wavelet Watermarking Based on Linear Bit Expansion)

  • 박영일;김석태
    • 한국통신학회논문지
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    • 제32권1C호
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    • pp.16-22
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    • 2007
  • 본 논문에서는 선형계수확장 기반의 웨이블릿 워터마킹 기법을 제안하였다. 워터마크의 안정성을 위해 먼저 워터마크에 대해 Arnold 변환을 한 후, 선형계수확장을 적용하여 확대된 워터마크를 웨이블릿 변환 된 영상의 저주파대에 일정한 강도로 삽입하였으며 추출 시에는 기존 방법과 달리 F-노름(norm) 함수를 적용하였다. 실험결과 본 논문에서 제안한 방법은 충실도와 강인성 측면에서 우수한 특성을 가짐을 확인하였다.

Chaotic Behavior Analysis in the Several Arnold Chaos Mobile Robot with Obstacles

  • Bae, Young-Chul;Kim, Yi-Gon;Mathis Tinduk;Koo, Young-Duk
    • 한국정보통신학회:학술대회논문집
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    • 한국해양정보통신학회 2004년도 SMICS 2004 International Symposium on Maritime and Communication Sciences
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    • pp.123-127
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    • 2004
  • In this paper, we propose that the chaotic behavior analysis in the several Arnold chaos mobile robot of embedding some chaotic such as Arnold equation with obstacle. In order to analysis of chaotic behavior in the mobile robot, we apply not only qualitative analysis such as time-series, embedding phase plane, but also quantitative analysis such as Lyapunov exponent in the mobile robot with obstacle. We consider that there are two type of obstacle, one is fixed obstacle and the other is hidden obstacle which have an unstable limit cycle. In the hidden obstacles case, we only assume that all obstacles in the chaos trajectory surface in which robot workspace has an unstable limit cycle with Van der Pol equation.

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Obstacle avoidance method in the UAV

  • Bae, Young-Chul;Kim, Chun-Suk;Kim, Yig-On
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2004년도 추계학술대회 학술발표 논문집 제14권 제2호
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    • pp.7-10
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    • 2004
  • In this paper, we propose a method to avoid obstacles that have unstable limit cycles in a chaos trajectory surface. We assume all obstacles in the chaos trajectory surface have a Van der Pol equation with an unstable limit cycle. When a chaos UAVs meet an obstacle in an Arnold equation or Chua's equation trajectory, the obstacle reflects the UAV

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Target searching method in the UAV

  • Bae, Young-Chul;Kim, Chun-Suk;Kim, Yi-Gon
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2004년도 추계학술대회 학술발표 논문집 제14권 제2호
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    • pp.11-14
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    • 2004
  • In this paper, we propose a method to target searching method that have unstable limit cycles in a chaos trajectory surface. We assume all targets in the chaos trajectory surface have a Van der Pol equation with an unstable limit cycle When a chaos UAV meet the target in the Arnold equation, Chua's equation trajectory, the target absorptive the UAV

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