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Author: search.filters.author.Srongprapa, Anupong

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    Estimation of vertical jump height using nintendo Wii remote IR camera
    (2018-12-05)
    Klongratog, Bhanupol
    ;
    Pengto, Warit
    ;
    Wornkert, Todsaporn
    ;
    Srongprapa, Anupong
    In this article, we proposed to measure the heights of countermovement jumps which are recorded in term of vertical leap by using the Wii Remote infrared camera. According to the physical principles, positions of the movement were detected based on the rules regarding conservation of energy, motion under gravity, and coordinate system. The obtained results were compared with that of the slow-motion measurements. The experiment involved 30 basketball players whose jump results were slightly deviated from the vertical measurement of the coordinate system. Therefore, the results should be calibrated each time the new system is installed.
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    Saline solution concentration measurement based on contact angle approach
    (2017-12-13)
    Klongratog, Bhanupol
    ;
    Srongprapa, Anupong
    ;
    Mannaramit, Padet
    ;
    Leelaphaiboon, Mongkol
    There are a number of factors that affect the quality control of an osmotic product. One of these is the concentration of the osmotic solution. There are several ways to measure solution concentration, such as optical measurement method, freezing point temperature measurement method, wave principle measurement method, viscosity and specific gravity measurement method. Saline solution concentration of the osmotic solution based on contact angle. The experiments showed whenever the saline solution concentration increased, the contact angle measured on the acrylic substrate increased as well. Their relation is also the linear correlation. Lastly, the developed software evaluated the saline solution concentration based on the contact angle close to the prepared saline solution concentration. The measured concentration was linear correlation with R-squared value of 0.996 that can be accurately applied on concentrations of 5% to 30% with maximum error of 4.72%.
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    Capacitive measuring of crude palm oil-water mixture
    (2017-12-13)
    Sriphant, Pongsakun
    ;
    Srongprapa, Anupong
    ;
    Klongratog, Bhanupol
    Oil palm is one of the famous commercial crops of Thailand. The production is in the 3<sup>th</sup> rank of the south east Asia, and plantation is still increasing every year. To investigate the feasibility of using electrical capacitance measuring technique as an alternative method for low-cost non-destructive, oil palm fresh oil (CPO) and water have been prepared and studied. One group is concerned with the immiscible fluid and another is all ultrasonic shakes. The mass concentration (x) of CPO varied from 0 g/cm<sup>3</sup> to 0.9 g/cm<sup>3</sup> and then all experiments were tested on room temperature (25<sup>o</sup>C). Guard parallel structure has been used in conjunction with AD7747 capacitive to digital converter to obtain capacitance value (y). The results show that y = 0.11987x<sup>2</sup> - 0.46104x + 0.47418 with r<sup>2</sup> = 0.98098. The model for second sample is y = 0.08965x<sup>2</sup> - 0.41335x + 0.3731 with r<sup>2</sup> = 0.9554. The capacitance of first sample is higher than the second sample. As previously mentioned, this project aims to make benefit of interest on seasonable optimistic harvests.