Tiengthong, Thanadol

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Tiengthong, Thanadol
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thanadol.ti@kmitl.ac.th

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    Item type:Publication,
    A Study of Improved Indoor Localization Accuracy using Looping Min-Max Technique
    (2024-01-01)
    Tiengthong, Thanadol
    ;
    Mankong, Thanadon
    ;
    Suwansukho, Nattapan
    ;
    Southisombath, Phouthong
    ;
    Chaisang, Aditep
    This paper investigates the efficacy of WLAN technology at 5.8 GHz for indoor localization, a widely adopted and versatile approach due to its adaptability and ease of implementation. The choice of 5.8 GHz frequency offers several advantages, including reduced interference and higher data transmission rates, enhancing the precision and reliability of localization systems. Utilizing Received Signal Strength (RSS) for distance calculation is employed due to its computational simplicity and efficiency. The proposed methodology employs a modified Min-Max technique for estimating positions, iterating the Min-Max process until the distance error aligns with a predefined threshold. Comparative evaluation using Cumulative Distribution Function (CDF) demonstrates improved accuracy compared to conventional Min-Max methods. The research findings indicate promising enhancements in accuracy and efficacy for indoor localization using WLAN technology at 5.8 GHz. These advancements hold significant potential for real-time indoor localization applications, paving the way for improved indoor navigation and tracking systems in the future.
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    Item type:Publication,
    Characterization of Electromagnetic Wave in Transformer for Partial Discharge Detection
    (2023-01-01)
    Suwan, Supakorn
    ;
    Tiengthong, Thanadol
    ;
    Southisombath, Phouthong
    ;
    Promwong, Sathaporn
    The increasing demand for electricity and the potential risks associated with partial discharge highlights the critical importance of robust transformer condition monitoring. Electromagnetic methods offer a promising approach to monitoring transformer health, benefiting from their ability to minimize external interference and their broad operating bandwidth covering HF, VHF, and UHF frequencies. The IEC 62478 standard provides multiple methodologies to leverage electromagnetic techniques in transformer health assessment, encompassing the analysis of electromagnetic waves through directivity, sensitivity, and transmission properties. In this study, we specifically investigate the transformer's UHF transmission characteristics. A vector network analyzer measures and records both transmitting and receiving elements of the UHF transmission channel and the UHF antenna. The measurements within the transformer tank simulate the realistic transformer environment. An optimum receiver is implemented at the receiver end to optimize the received signal quality. The results are comprehensively evaluated by analyzing the UHF transmission channel's path loss and transmission gain within the transformer. The primary objective of this research is to thoroughly examine the UHF transmission characteristics for efficient transformer condition monitoring, offering valuable insights for researchers and engineers involved in mitigating the risks associated with partial discharge in transformers.