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Development of Wearable Device for Hearing Impaired people Using Arduino
전안균,정동원,이상현 한국인터넷방송통신학회 2019 Journal of Advanced Smart Convergence Vol.8 No.4
Hearing impaired people are apt to be in danger because they can’t detect danger with sound. Hearing impaired people have less risk-detection ability than non-disabled people because of lack of hearing. There are many devices to help the hearing impaired, such as hearing aids. A hearing aids can be helpful, but it may not be available depending on the degree or type of hearing loss for example, to the hearing-impaired people with little remaining hearing of high frequencies, ordinary hearing aids are not very useful for understanding the high frequency consonants and it requires a high cost, from thousands to tens of thousands of dollars. Also, it is difficult for the underprivileged, such as the low-income bracket and the elderly, to use them because they are difficult to manage. Therefore, this paper describes the development of low-cost wearable device to assistant a hearing-impaired people using Arduino. Also, it accepts values from switches or sensors and can control external electronic devices such as LEDs and motors to create objects that can interact with the environment. In this is paper, through sound sensors, the ambient sound was taken as an analogue value and transmitted to the aduino board, and the vibration motor was operated when the noise was generated, so that the user could be aware of the occurrence of danger.
Study on Current Limiting Characteristics of YBCO Thin- Film Wire with Insulation Layer
두승규,두호익,전안균 한국전기전자재료학회 2013 Transactions on Electrical and Electronic Material Vol.14 No.1
When applying superconducting wire to power machines, an investigation needs to be carried out on the characteristics of wire phase changes in connection with the insulating layer. This study examined trends in the increase of the wire’s resistance and the characteristics of its recovery from quenching by a current-applied cycle at temperatures of 90 K, 180 K, and 250 K. The procedure was conducted based on the thickness and presence (or absence) of the insulating wire layers. To achieve this, YBCO thin-film wires with the same critical temperatures were prepared with copper and stainless steel stabilizing layers. At levels (-one, three, and five-), with superior performance, polyimide pressure-sensitive adhesive tape was attached to the wires at a very low temperature. The eight prepared test samples were wound around the linear frames. The wire’s voltage and current created from the phase change characteristics were measured at the wire’s prescribed temperature, using the four-point probe method. The wire’s resistance and recovery characteristics were examined for each cycle at temperatures of 90 K, 180 K, and 250 K.
이정훈,진범수,강명균,김인용,전안균,박진형,김동기,신용덕 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
Silicon carbide (SiC)-zirconium diboride (ZrB2) composites are produced by subjecting a 60 : 40 vol% mixture of β-SiC powder and ZrB2 matrix to spark plasma sintering (SPS). Sintering is carried out for 60 sec at temperatures of 1400 o C and 1500 o C and uniaxial pressures of 40 MPa, 50 MPa, and 60 MPa, under argon atmosphere. The physical, mechanical, and electrical properties of the sintered SiC-ZrB2 composites are examined. Evidence of reactions between β-SiC and ZrB2 in the SiC-ZrB2 composites sintered under argon atmosphere is not observed by high-resolution x-ray diffraction (HR-XRD) analysis. The trends in the apparent density and flexural strength of the sintered SiC-ZrB2 composites are not dependent on the uniaxial pressure when the sintering temperature is 1500 o C. Among the sintered SiC-ZrB2 composites, the specimen produced at 1500 o C and 50 MPa shows the lowest volume electrical resistivity at room temperature, 0.617 × 10-3Ω·cm. By energy-dispersive spectroscopy (EDS) mapping, it is confirmed that ZrB2-chain formation in the sintered SiC-ZrB2 composites uniformly occurred at 1500 o C and 50 MPa. The flexural strength of the sintered SiC-ZrB2 composites is dependent upon their apparent density, but the volume electrical resistivity is independent of the apparent density. Densification of a sintered SiCZrB2 composite through hot pressing is dependent on the sintering temperature and pressure. However, this study confirms that the densification of SiC-ZrB2 composites through SPS does not depend on the uniaxial pressure.