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RISS 인기검색어
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- 저자 : 안명천(Myung-Cheon Ahn) (검색결과 2 건)
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안명천(Myung-Cheon Ahn),최종구(Jong-Gu Choi),손일호(Il-Ho Son),이상석(Sang-Suk Lee),김근호(Kuen-Ho Kim) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.3
In order to get the precise blood pressure and pulse number in the cuffless status, the wrist wearable pulsimeter with a portable and small size apparatus using by Hall device is developed. The regression analysis of the pulse wave measured by the testing product of pulsimeter is conducted two equations of the blood pressure algorithm. The estimated values of blood pressure obtained by the cuffless pulsimeter during 5 s are compared with the practical values measured by electronic or mercury liquid blood pressure meters. The standard deviation of the estimated value and the practical value for the high blood pressure and the low blood pressure were 12.1 and 5.9, respectively, which have the neighborhood values of BP International Standard. The detail analysis of a pulse wave measured by cuffless wrist wearable detecting the changes of the magnetic field can be used to develop a new diagnostic algorithm of blood pressure applying for oriental medical apparatus like as the wrist wearable pulsimeter.
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박상현(Sang-Hyun Park),소광섭(Kwang-Sup Soh),안명천(Myung-Cheon Ahn),황도근(Do-Guwn Hwang),이상석(Sang-Suk Lee) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.3
In this study, a high sensitive giant magnetoresistance-spin valve (GMR-SV) bio-sensing device with high linearity and very low hysteresis was fabricated by photolithography and ion beam deposition sputtering system. Detection of the Fe-hemoglobin inside in a red blood and magnetic nanoparticles using the GMR-SV bio-sensing device was investigated. Here a human’s red blood includes hemoglobin, and the nanoparticles are the Co-ferrite magnetic particles coated with a shell of amorphous silica which the average size of the water-soluble bare cobalt nanoparticles was about 9 ㎚ with total size of about 50 ㎚. When 1 ㎃ sensing current was applied to the current electrode in the patterned active GMR-SV devices with areas of 5×10 ㎛² and 2×6 ㎛², the output signals of the GMRSV sensor were about 100 ㎷ and 14 ㎷, respectively. In addition, the maximum sensitivity of the fabricated GMR-SV sensor was about 0.1~0.8%/Oe. The magnitude of output voltage signals was obtained from four-probe magnetoresistive measured system, and the picture of real-time motion images was monitored by an optical microscope. Even one drop of human blood and nanopartices in distilled water were found to be enough for detecting and analyzing their signals clearly.
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