Browsing by Author "Wu, Yi-Ting"

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Biometric Identification Using JPEG2000 Compressed ECG Signals
(2015-10-01)
Wu, Hung-Tsai
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Wu, Yi-Ting
;
Chang, Wen-Whei
;
電信工程研究所
;
Institute of Communications Engineering
In wireless telecardiology applications, electrocardiogram (ECG) signals are often represented in compressed format for efficient transmission and storage purposes. Incorporation of compressed ECG based biometric enables faster person identification as it by-passes the full decompression. This study presents a new method to combine ECG biometrics with data compression within a common JPEG2000 framework. To this end, an ECG signal is considered as an image and the JPEG2000 standard is applied for data compression. Features relating to ECG morphology and heartbeat intervals are computed directly from the compressed ECG. Different classification approaches are used for person identification. Experiments on standard ECG databases demonstrate the validity of the proposed system for biometric identification with high accuracies on both healthy and diseased subjects.
Compressed Domain ECG Biometric Identification using JPEG2000
(2015-01-01)
Wu, Yi-Ting
;
Wu, Hung-Tsai
;
Chang, Wen-Whei
;
電信工程研究所
;
Institute of Communications Engineering
In wireless telecardiology applications, electrocardiogram (ECG) signals are often represented in compressed format for efficient transmission and storage purposes. Incorporation of compressed ECG based biometric enables faster person identification as it by-passes the full decompression. This study presents a new method to combine ECG biometrics with data compression within a common JPEG2000 framework. To this end, ECG signal is considered as an image and the JPEG2000 standard is applied for data compression. Features relating to ECG morphology and heartbeat intervals are computed directly from the compressed ECG. Different classification approaches are used for person identification. Experiments on standard ECG databases demonstrate the validity of the proposed system for biometric identification with high accuracies on both healthy and diseased subjects.
Determination of calcium in complex samples using functional magnetic beads combined with electrodeless/sheathless electrospray ionization mass spectrometry
(2006)
Wu, Yi-Ting
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Chen, Yu-Chie
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應用化學系
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應用化學系分子科學碩博班
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Department of Applied Chemistry
Conventionally, electrospray ionization ion trap mass spectrometry (ESI-ITMS) is not used for the analysis of metal ions because metal ions may be of too low mass to be trapped by the mass analyzer. Furthermore, metal ions can easily precipitate during ESI processes because of their poor volatilities. We present an approach for solving these two problems using milk as the sample to demonstrate the feasibility of using ESI-ITMS as the detection method for metal ions. Iron oxide magnetic beads with nitrilotriacetic acid (NTA) immobilized on their surface were used as affinity probes for calcium ions from dairy drinks. Ethylenediaminetetraacetic acid (EDTA) was used for the elution of the metal ions chelated by NTA on the beads. The EDTA eluent was analyzed by electrodeless/sheathless ESI-ITMS. The use of functional magnetic beads to trap metal ions from complex samples can effectively reduce the interference from sample matrix. Using the EDTA eluent as the sample avoids the problem of the low volatility of metal ions during ESI-ITMS analysis. This method gives measurements of calcium ions in dairy drinks quantitatively very close to the true values (< 4% error). Copyright (c) 2006 John Wiley & Sons, Ltd.