Browsing by Author "Chen, Heng-Yin"

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Modeling and Analysis of Touch on the Flexible Ultra-Thin Touch Panel by Using the Finite Element Method
(2016)
Chao, Paul C. -R
;
Chou, Kuo-Yu
;
Wu, Chang-Xian
;
Chen, Chuan Xin
;
Lu, Yi-Chuan
The work employs the finite element method to model the finger touch on the flexible ultra-thin touch panel for analyzing the touch signal. The touch signal generates the ghost points when the fingers multi-touch on the flexible ultra-thin touch panel. The simulation of minimizing the top layer (over cover) thickness based on the model is conducted in order to eliminate the ghost points. The simulation results show the over cover thickness should be larger than 107 mu m to eliminate the ghost points. Further, we propose the method to solve the ghost points and minimize the over cover thickness. The simulation results conducted in this proposed method show that the over cover thickness can be reduced further to 65 mu m.
Spectrophotometric and thermal stability of agarose-based ultrasonic tissue-mimicking gel
(2019-04-21)
Chen, Heng-Yin
;
Chen, Nelson G.
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分子醫學與生物工程研究所
;
電機工程學系
;
Institute of Molecular Medicine and Bioengineering
Spectrophotometric measurements of a commonly used agarose-based ultrasonic tissue-mimicking gel are reported. In addition, spectral characteristics after heating to different temperatures provide thermostability information. Thermostability of agarose gels has not been previously reported, except in general terms. Gels were produced and cast into 2 mm thick spectrophotometric cuvettes. UV-Vis spectra were recorded after gels were heated to various temperatures. Spectral changes resulting from heating were noted and were largely unchanged with heating to temperatures ranging from 30 to 70 degrees C. Only with heating to 80 degrees C, which is near the melting point of the gel material, do spectra irreversibly change. We show that agarose-based tissue-mimicking gels are largely stable over temperatures relevant to most biomedical ultrasonic studies, including those examining hyperthermia or high-intensity focused ultrasound. Therefore, they likely provide a stable substrate in which to conduct ultrasonic heating studies. In addition, UV-Vis spectrophotometry of this optically opaque material has been demonstrated. Possible additives to this material that would enable the measurement of temperature fields through postexposure sectioning and slicing are subsequently discussed. Published under license by AIP Publishing.