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Kim, Sun Ae;Kim, Tae Yang;Lee, Yeol Eum;Lee, Soo Yeon;Jeong, Mok Kun;Kwon, Sung Jae
- The Journal of the Acoustical Society of Korea
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- v.38 no.4
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- pp.467-475
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- 2019
A high-intensity ultrasound wave generates acoustic streaming and acoustic radiation forces when propagating through a medium. An acoustic radiation force generated in a three-dimensional space can produce a solid tactile sensation, delivering spatial information directly to the human skin. We placed 154 ultrasound transmit elements with a frequency of 40 kHz on a concave circular dish, and generated an acoustic radiation force at the focal point by transmitting the ultrasound wave. To feel the tactile sensation better, the transmit elements were excited by sine waves whose amplitude was modulated by a 60 Hz square wave. As an application of ultrasonic tactile sensing, a region where tactile sense is formed in the air is used as an indicator for the position of the hand. We confirmed the utility of ultrasonic tactile feedback by implementing a system that provides the number of fingers to a machine by receiving the shape of the hand at the focal point where the tactile sense is detected.
https://doi.org/10.7776/ASK.2019.38.4.467 인용 PDF KSCI HTML

Ly, Suw Young;June, Young Sam;Lee, Hyun Ku;Kwak, Kyu Ju;Kim, Kun Woo;Kim, Jong Hyoung;Jeong, Ho Young;Kim, Bong Kyun;Chun, Seok Joo;Chang, Jin Won
- Analytical Science and Technology
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- v.20 no.4
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- pp.289-295
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- 2007
A simple electric circuit of an infrared photodiode electrode (IPDE) was utilized to monitor iron using square-wave (SW) anodic stripping voltammetry (SV) and cyclic voltammetry (CV). The optimum analytical conditions were determined and were compared with those of common working electrodes. The comparison showed that CV is more sensitive and convenient to use than the common voltammetry methods. At the optimized conditions, the working ranges of 0.1- to 0.8- and 0.85- to 6.0 mg/L iron was obtained. Relative standard deviation of 15 measurements of iron (0.4 mg/L) was 0.09%. The analytical detection limit was found to be $80{\pm}0.6ug/L$, which was applied to iron in waste water.
https://doi.org/10.5806/AST.2007.20.4.289 인용 PDF KSCI