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    The improvement on digital signature standard
    (Mahidol University. Mahidol University Library and Knowledge Center, 2024) Panomporn Suvannapattana; Damras Wongsawang; Supachai Tangwongsan
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    Echo cancellation in voice over IP
    (Mahidol University. Mahidol University Library and Knowledge Center, 2008) Ittipon Rassameeroj; Supachai Tangwongsan
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    An application of digital signature to stock trading system
    (Mahidol University. Mahidol University Library and Knowledge Center, 2024) Russamee Jenpunyarat; Supachai Tangwongsan; Damras Wongsawang; Jarernsri L. Mitrpanont
    in order to provide investors to be able to perform the stock trading all the times e.g. 24 hours a day, and directly with SET. Main technique is the introduction of the concept of digital signature. The digital signature, as its name suggested... to settle possible dispute. A prototype of the proposed system is developed by using Delphi Client / Server. The portion of digital signature is developed by Visual C++ and compiled into DLL file, with the database management system based on Paradox
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    Using signature file technique for searching a multi-valued attribute in relational database
    (Mahidol University. Mahidol University Library and Knowledge Center, 1998) Pairut Leelahakarnjana; Damras wongsawang; Supachai Tangwongsan
    Signature file is an indexing technique for searching unformatted data in an information retrieval system. The earliest structure of signature file is sequential signature file. In query evaluation, sequential signature file requires accessing all... (Structural Query Language) requires high processing time. For these reasons, we propose a model that uses signature file for searching the multi-valued attribute in a relational database. Generally, if a relation has the multi-valued attribute, it should
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    Critical appraisal of technologies to assess electrical activity during atrial fibrillation: a position paper from the European Heart Rhythm Association and European Society of Cardiology Working Group on eCardiology in collaboration with the Heart Rhythm Society, Asia Pacific Heart Rhythm Society, Latin American Heart Rhythm Society and Computing in Cardiology
    (2022-02-01) De Groot N.M.S.; Mahidol University
    of recording technologies on EGM morphology, (iii) global or local mapping using various types of EGM involving signal processing techniques including isochronal-, voltage- fractionation-, dipole density-, and rotor mapping, enabling derivation of parameters... restricted to specific applications or have technological limitations. Improvements in AF mapping by obtaining highest fidelity source signals (e.g. catheter-electrode combinations) for signal processing (e.g. filtering, digitization, and noise elimination
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    Digitalization evaluation of welder performance
    (Mahidol University. Mahidol University Library and Knowledge Center, 2024) Seamkong, Kuoch, 1992-; Eakkachai Warinsiriruk; Tuangyot Supeekit; Thanakorn Naenna ; Sutep Joy-A-Ka
    This research studied the natural hand-movement of welder in Gas Metal Arc Welding (GMAW) process. In terms of semi-automatic GMAW process, welder skills could affect the weld bead quality. To monitor torch movement and arc stability of manual... welding, the arc signal of current and voltage from the welding machine were utilized to observe on hand movement of welder. The research involved three main stages. First, was simulation of the hand-fluctuation using robot welding, then the Cyclogram
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    A refinement of stroke structure for printed Thai character recognition
    (2008-12-01) Supachai Tangwongsan; Orawan Jungthanawong; Mahidol University
    In this paper, it presents a very efficient recognition system for printed Thai characters. The major techniques are using structural features of stroke and setting production rules for classification. For the former, a technique is employed to re... classification. In this work, 12 clusters for Thai consonants, digits and special characters are grouped together, including 8 clusters for Thai vowel signs and tone marks. The proposed system is tested with over 1,000,000 Thai characters of multi-fonts and multi
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    PublicationOpen Access
    ผลของด้ายแยกเหงือกต่อสัญญาณการไหลเวียนโลหิตของเนื้อเยื่อในด้วย เครื่องมือเลเซอร์ดอปเปลอร์: ในสิ่งมีชีวิต
    (2013-01) Pattaranat Banthitkhunanon; ภัทรณัฏฐ์ บัณฑิตคุณานนต์; Sitthichai Wanachantararak; สิทธิชัย วนจันทรรักษ์; Noppakun Vongsavan; นพคุณ วงษ์สวรรค์; Sitthichai Wanachantararak; สิทธิชัย วนจันทรรักษ์; Mahidol University. Faculty of Dentistry. Department of Oral biology
    the AlCl3-impregnated gingival retraction cord was inserted in the sulcus. Custom-made opaque plastic splints were used to position the probe and minimized undesirable reflected light from the gingival tissues. The output signals were digitalized and fed... into a lap-top computer. Results: The pulpal blood flow signals measured during packing retraction cord in the gingival sulcus of both premolars and molars were significantly less than the measurements before inserting the retraction cord, approximately
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    PublicationOpen Access
    Development of piezoelectric DNA-based biosensor for direct detection of mycobacterium tuberculosis in clinical specimens
    (2010) Thongchai Kaewphinit; Somchai Santiwatanakul; Chamras Promptmas; Kosum Chansiri
    This study was focused on establishment of piezoelectric biosensor for direct detection of Mycobacterium tuberculosis (MTB) in clinical specimens. The quartz crystal immobilized via 3-mercaptopropionic acid (MPA)/avidin/DNA biotinylated probe on gold surface and hybridization of the DNA target to DNA biotinylated probe. The optimal concentration of MPA, avidin and 5’-biotinylated DNA probe for immobilization of specific DNA probe on gold surface were 15 mM, 0.1 mg/ml and 1.5 μM, respectively. The detection of genomic DNA digestion in the range from 0.5 to 30 μg/ml. The fabricated biosensor was evaluated through an examination of 200 samples. No cross hybridization were observed against M. avium complex (MAC) and other microorganism. This target DNA preparation without amplification will reduce time consuming, costs, and the tedious step of amplification. This study can be extended to develop the new method which is high sensitivity, specificity, cheap, easy to use, and rapid for detection of MTB in many fields.
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    PublicationOpen Access
    Customized-language voice survey on mobile devices for text and image data collection among ethnic groups in Thailand: a proof-of-concept study.
    (2014-03-06) Kasemsak Jandee; เกษมศักดิ์ จันดี; Saranath Lawpoolsri; สารนาถ ล้อพูลศรี; Pimsurang Taechaboonsermsak; พิมพ์สุรางค์ เตชะบุญเสริมศักดิ์; Amnat Khamsiriwatchara; Peerawat Wansatid; Jaranit Kaewkungwal; จรณิต แก้วกังวาล; Jaranit Kaewkungwal; Mahidol University. Faculty of Tropical Medicine. Center of Excellence for Biomedical and Public Health Informatics (BIOPHICS); Mahidol University. Faculty of Tropical Medicine. Department of Tropical Hygiene.; Mahidol University. Faculty of Public Health. Department of Family Health.
    interviewer. The process can be time-consuming and there is the risk of missing important data due to incomplete surveys. OBJECTIVE: This study was conducted as a proof-of-concept to develop a new electronic tool for data collection, and compare... in terms of data completeness and time consumed in data collection process. Since the smartphone questionnaire survey was programmed to ask questions in sequence, no data was missing and there were no entry errors. Participants had positive attitudes