Anurak Jansri

On comparison of attractors for chaotic mobile robots

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 robots path are compared by computer simulation under given conditions.

Enhanced model and fuzzy strategy of air to fuel ratio control for spark ignition engines

Various mathematical models for the air to fuel ratio and control for spark ignition (SI) engines have been proposed to satisfy technical specifications. This paper reveals an improvement of the mean value model (MVEM) and a simple yet effective nonlinear control to enhance the air to fuel regulator. The regulator is designed by using a discrete fuzzy PI algorithm, which provides easy tuning, robustness, and rapid development with a simple architecture. Effects on the dead time, exhausted delay, time-varying air flow and chaotic disturbance are also included. The computer simulation results show satisfactory performance based on standard evaluation criteria. The proposed model has a great potential for practical implementations.

On practical control of electronic throttle body

An electronic throttle body is a nonlinear device that includes effects on dead time, transmission friction, throttle plate friction and return spring limp-home. The effects are problem to precisely control of electronic throttle regulation. In recent year, various control designs have been proposed. This paper presents a simple yet effective nonlinear controller to enhance the regulator. The regulator is embedded using a discrete fuzzy PI algorithm, provided easy tuning, robustness and rapid development with simple architecture. The effects are also in consideration. The experiment results are carried out and show satisfactory performance using standard criteria such as an integral of absolute error (ITAE), an integral of square error (ISE) and a mean absolute error (MAE).

A design of stream cipher based on multi-chaotic functions

This work presents the design of a stream encryption algorithm using chaotic functions. Various chaotic functions which are highly sensitive and unpredictable to initial conditions have been tested for use as a key stream. A technique employing multi-chaotic function generation for increasing the complexity of the keystream is presented. The result of a statistical test of the keystream has been proved. Thus, this encryption technique can be applied to secure communication, particularly for multimedia transmission.

Tree robot: An innovation for STEAM education

Embracing complexity in todays 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 21st 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.

Anti-copy of 2D Barcode Using Multi-encryption Technique

2D barcode can be found largely at product of department store. The general purpose of 2D barcode is to identify product. Process of 2D barcode is run in the assembly production line. Nowadays, the simple 2D barcode can be easily copied. Then, this paper proposes new technique to generate 2D barcode. The technique is multi encryption by chaotic equation that is very difficult to reproduce. In experimental design, 2D barcode can be used only one-time and can be recorded into decoding system to protect repeating. This paper has led to real benefit for Fresh Group company limited in Thailand.

Design and implementation of continuous microwave biomass carbonization system

This paper discusses a new design and implementation of a microwave heating for continuous biomass carbonization system. The heating system employs multi feed microwave generators with a maximum power of 10 kW and 2.45 GHz frequency. This new technique is developed to control electromagnetic field distribution inside the microwave heating cavity reactor of biomass carbonization. A chaotic mode pattern microwave generator is used for the technique. The result shows that the technique gives the cost and time-saving, easy to control, and effective performance.

Chaotic control for the reactor of a continuous microwave biomass carbonization process

This paper presented a new heating technique using chaotic mode pattern generator to control a uniform- heating distribution of multi-feed microwave cavity in order to heat the reactor of a pilot-scale continuous microwave biomass carbonization process This technique not only suggest the potential of the proposed system which operates more smoothly but also reduce electric power consumptions of the continuous microwave biomass carbonization process.

Force Sensor and its Application to Tuning Fork Response Measurement

Generally, force measurement of nanoscale material widely employs a quartz tuning fork which is resonant mechanical sensors on 32.768 kHz resonance frequency and is powerful tools. But, this paper designs the sensor by using tuning fork on 3 kHz and modifies the tuning fork by a tiny pin adhesive into the end of prong. In experiment, measurements of electrical signal from piezoelectric are study of load-mass effect and pin position. 2 touching techniques are considered: a shear-force type and a tapping mode type with highly position movement system. Silicone rubber, vinyl eraser and hydrogel are elastic material for testing. Results show that both weight and position of pin is significant influencer for resonance frequency and quality factor of sensor. Finally, the tuning fork response experimentation shown this method can be applied to material classification.

Chaotic application for Industrial Microwave Heating System without mode-stirring mechanism

More than two decades, chaos has been attracted many attention from scientists and engineers. Chaotic system phenomenon seems to be random for observers, but it is deterministic for a designer. System of Chaos attractors have been constructed more than a thousand of chaotic patterns. But implementation of chaos in engineering is still needed for real application. For this sake, the research objective is to search for new chaotic applications for Industrial Microwave Heating System without mode-stirring mechanism. The result shows that the performance of the proposed system is better than the conventional system in the rise of temperature. Eventually, the proposed method can be applied in the real application.