• Journal of Korean Electronics
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• v.3 no.7
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• pp.96-100
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• 1983

• Journal of rehabilitation welfare engineering & assistive technology
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• v.11 no.4
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• pp.331-338
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• 2017

In this study, a portable x-ray generator was manufactured and a real-time image acquisition system was constructed using the image intensifier from the generated generator. We have developed a real - time position error verification system that can verify whether the artificial joint position is different from the initial image from the acquired image. The template image of the region of interest is extracted from the reference image using the pattern matching technique and compared with the image to be compared. As a result, It is shown that real - time position error verification is achieved by displaying the difference angle. This system is portable type, has a self-shielding facility, and the output of the irradiation device can be manufactured in a small size of 1kw and can be used as a portable type. In case of emergency patients in the non-destructive field for industrial use, It has proved effective for use in small areas such as feet.

• Archives of design research
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• v.17 no.4
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• pp.5-14
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• 2004

Black and white TV design process at early electronics industry can help greatly in strategy of forward product development or production and marketing. Because, there is history about existed all product to precess that progress. Past information make good use that estimate of new design. According to character of product, advertisement and business strategies are available some extension of life cycle or preservation. But, it is need the data accumulated with correct analysis for ability that competitive power of the product. Data of Past information take advantage of well information is essential. Information about past products arranged pamphlet and newspaper advertisement. At this study emphasized on console model TV and portable style TV design change process of technology ability from 1960s to 1980s about product selling point. Creation and extinction about products can get into iteration to other household electric appliance. Design process of past product design has a history with our international location or influence power of household electric appliance. Therefore, such past flowing can important role as basis of forward product design.

• Journal of IKEEE
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• v.14 no.2
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• pp.16-23
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• 2010

Since the interest of a brain science research is increased recently, various devices using brain waves have been developed in the field of brain training game, education application and brain computer interface. In this paper, we have developed a portable EEG measurement and a bluetooth based wireless transmission device measuring brain waves from the frontal lob simply and conveniently. The low brain signals about 10~100${\mu}V$ was amplified into several volts and low pass, high pass and notch filter were designed for eliminating unwanted noise and 60Hz power noise. Also, PIC24F192 microcontroller has been used to convert analog brain signal into digital signal and transmit the signal into personal computer wirelessly. The sampling rate of 1KHz and bluetooth based wireless transmission with 38,400bps were used. The LabVIEW programing was used to receive and monitor the brain signals. The power spectrum of commercial biopac MP100 and that of a developed EEG system was compared for performance verification after the simulation signals of sine waves of $1{\mu}V$, 0~200Hz was inputed and processed by FFT transformation. As a result of comparison, the developed system showed good performance because frequency response of a developed system was similar to that of a commercial biopac MP100 inside the range of 30Hz specially.