Sooraksa, Pitikhate

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Sooraksa, Pitikhate
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Sooraksa, P.
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pitikhate.so@kmitl.ac.th

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    Combined chaotic attractor mobile robots
    (2006-12-01)
    Chanvech, Channawat
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    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    The application of chaos in engineering field has been attracted much attention due to many potential applications include fan heaters, air-conditions, and dish washing machines. Even though the applied chaos in robot guidance is also not new, the problem of navigation of autonomous mobile robot in a totally unknown environment can be accomplished by using chaotic function. For implementation, most of researchers use CPUs with high performance to generate the chaotic trajectory. Unlike the others, in this paper, we use a chaotic circuit, which is low cost and easy to construct for trajectory generators. The Chua's circuit and a complex butterfly attractor are combined together providing pattern diversity and area coverage. A lab-scale two-wheel mobile robot is implemented and tested in our laboratory. The experimental results confirm that the proposed scheme of combined chaotic attractors is effective for path guiding for chaotic mobile robots. © 2006 ICASE.
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    On comparison of attractors for chaotic mobile robots
    (2004-12-01)
    Jansri, Anurak
    ;
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    In case of no map, trajectory planning could be a difficult task for robot motions to navigate around the assigned patrol areas. Chaotic mobile robots that move in chaotic patterns can be used to solve this problem. This paper is motivated by the question in seeking for suitable chaotic pattern for the aforementioned problem. Twenty-five chaotic patterns generated from various chaotic signals for the robot's path are compared by computer simulation under given conditions. © 2004 IEEE.
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    Tree robot: An innovation for STEAM education
    (2016-12-14)
    Sooraksa, Pitikhate
    ;
    Sakorntanant, Sakda
    ;
    Jansri, Anurak
    ;
    Klomkarn, Kitdakorn
    Embracing complexity in today's world makes students impatient to learn following the conventional chalk-and-talk style of teaching, and yet plenty of helpful IT-techniques are available and surrounded. This talk provides a care-and-feeding of STEAM education, namely 'Science, Technology, Engineering, Art, and Mathematics', offering a new way of utilizing matters of natural learning to be 'live'. A tree robot is created as an instrument to help students achieve the 21<sup>st</sup> century learning skills. As a result of many hours in experiments with the proposed pedagogy, the robot helps redefine what attention is and how to use it innovatively.
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    Further investigation on trajectory of chaotic guiding signals for robotic systems
    (2004-12-01)
    Jansri, Anurak
    ;
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    Chaotic signals have been used and can be generated by a chaotic circuit for controlling trajectories of mobile robots. Application of chaotically robotic systems may be employed for cleaning and patrolling tasks, when information of areas at work is not available. This paper presents an investigation on trajectory of chaotic guiding signals generated by Chua's attractor and Arnold's non-attractor in five given situations. According to the simulation, with best adjusting parameters for both signals, the trajectory generated from Chua's pattern has covered more areas than that of Arnold's counterpart for all testing cases.
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    Simple self-instructional modules based on chaotic oscillators: Few blocks generating many patterns
    (2011-01-01)
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    Chaotic circuits have been widely used in the teaching of nonlinear dynamics disciplines, where a common practice is pedagogically based on the circuit point of view. Chua's circuit is the most popular platform for the demonstration of its components with rich dynamical patterns. However, engineering students majoring in control systems are more familiar with feedback systems rather than physical electronics with nonlinear components. This may lead to some difficulty in understanding the nonlinear properties of Chua's circuit, at least on first sight. This paper provides an alternative approach to teaching and learning chaotic oscillators by using the inherent understanding of feedback systems with simple modules at the undergraduate level. Utilizing the idea of chaotification, which means to make a nonchaotic module chaotic, the modules consist of only four blocks yet can generate more than thirty types of chaotic patterns via their various combinations. Conceptually, the blocks can be assembled as various mixed-mode chaotic circuits. Functionally, the blocks are easy-to-use in a Simulink-like fashion. Structurally, they are a LEGO-like educational kit. With low-cost implementation employing a few op-amps for each block, the newly proposed modules are simple, self-instructional and suitable for teaching and training students in school laboratories and in experimental environments. © 2011 World Scientific Publishing Company.
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    Communication network structure for robotic manipulators
    (2015-01-26)
    Poncharernpong, Nuttapon
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    Charanyananda, Sunchanan
    ;
    Silakam, Youtthana
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    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    This article presents the design and implementation of communication networks for robotic manipulator. The aim of this work is to investigate a suitable pattern for communication network structure. The designed network can be used under disaster environment through a group of information-communication robots.
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    A universal-mode chaotic oscillator
    (2019-04-15)
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    The universal-mode chaotic oscillator obtaining various pattern chaotic signals is presented. In the proposed circuit, fours current feedback operational amplifiers(CFOAs) and one conventional operational amplifier are designed and implemented. The proposed circuits are verified by Pspice simulation and are validated by experiments.
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    New construction of mixed-mode chaotic circuits
    (2010-01-01)
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    ;
    Chen, Guanrong
    This paper presents a simple scheme for designing mixed-mode chaotic circuits using quadrature core oscillators. Two mixed-mode circuits are constructed by using a few operational amplifiers in suitable combination with some autonomous/nonautonomous second/third-order chaotic circuits. Simulation and experimental results have verified the simplicity and effectiveness of the new design. © 2010 World Scientific Publishing Company.
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    Extended Baker map using Scan patterns for image encryption
    (2013-01-01)
    Hung, Pham Anh
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    Sooraksa, Pitikhate
    ;
    Klomkarn, Kitdakorn
    In this paper, an improvement on free-size image encryption scheme using Baker map combining Scan patterns is proposed. The generalized discrete chaotic Baker map uses sequences of parameters generated by chaotic Gauss map to divide image matrix into boxes. Scrambling method is done by using Scan patterns in each boxes of chaotic Baker map. After scrambling method, chaotic 3-D Chen system is selected to do the pixel transformation. Through the experiments, the security of proposed scheme is tested by introducing keys analysis, entropy analysis, statistical analysis, and processing time so that the scheme achieves high encryption efficiency © 2013 IEEE.
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    A simple chaotic drawing robot: STEAM 2.0
    (2016-12-14)
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    This paper describes how to construct a simple chaotic robot for drawing based upon active learning in STEAM 2.0. The term STEAM 2.0 refers to extending the conventional design from physical objects to facilitating actions. This approach is taken to teach students to explore the chaotic Chua's circuit thereby observing nonlinear dynamical phenomena. Fabricating a simple low-frequency Chua's circuit and assembling a low-cost mobile vehicle, engineers can now design a chaotic robot capable of accomplishing non-conventional tasks of creating chaotic arts and investigating mathematical patterns. This paper will demonstrate such an accomplishment.