Shih-Han Wang

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Computer-aided food identification and quantity estimation have caught more attention in recent years because of the growing concern of our health. The identification problem is usually defined as an image categorization or classification problem and several researches have been proposed. In this paper, we address the issues of feature descriptors in the(More)
This paper handles the internal and external fragmentation problems of CDMA systems using orthogonal variable spreading factor (OVSF) codes. Internal fragmentation occurs when the allocated data rate is larger than what is requested while external fragmentation occurs when the OVSF code tree is too fragmented to support a call even if there are sufficient(More)
Current methods for the accurate diagnosis of osteoarthritis (OA) based on magnetic resonance imaging and enzyme-linked immunosorbent assay method are highly sensitive and specific but require specialised laboratory facilities and highly trained operators to obtain a definitive result. A quartz crystal microbalance (QCM) immunosensor has been developed to(More)
A thick-film electrochemical sensor with an iridium-carbon working electrode was used for determining polyphenols and their antioxidant capacity in white wine. Caffeic acid was used as a model species because it has the ability to produce the highest oxidation current. The correlation coefficient of 0.9975 was obtained between sensor response and caffeic(More)
A three-electrode based CO(2) sensor was fabricated using thick-film technology. The performance of this sensor was further enhanced by incorporating platinum nanoparticles onto the working electrode surface. An eight-fold increase in the signal output was obtained from the electrode with the platinum nanoparticles. The sensing output was linearly related(More)
In this work, we report a surface acoustic wave (SAW) sensor based on a polyaniline/WO3 nanocomposite layer to detect NO2. The presented SAW sensor exhibited reversibility, sensitivity, and repeatability when NO2 was in ppm level at room temperature. The frequency shift df / fo of sensor was 0.58 ppm to 29 ppm NO2.
The parts-per-billion-level nitric oxide (NO) gas sensing capability of a copper-ion-doped polyaniline/tungsten oxide nanocomposite (Cu(2+)/PANI/WO3) film coated on a Rayleigh surface acoustic wave device was investigated. The sensor developed in this study was sensitive to NO gas at room temperature in dry nitrogen. The surface morphology, dopant(More)
A surface acoustic wave sensor (SAW) based on polyaniline/tungsten oxide nanocomposite thin film was used to detect nitrogen dioxide at room temperature in this study. Polyaniline/tungsten oxide nanocomposite structure was fabricated from the aniline monomer and tungsten oxide gel. The coupling of modes (COM) theory was used to design the SAW device and(More)
Despite growing interest in using sparse coding based methods for image classification and retrieval, progress in this direction has been limited by the high computational cost for generating each image's sparse representation. To overcome this problem, we leverage sparsity-based dictionary learning and hash-based feature selection to build a novel(More)