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Particle concentration sensor using control volume between double electrical sensing zones
이동우,S. Yi,조영호 한국물리학회 2006 Current Applied Physics Vol.6 No.1l
We present a novel ow-rate independent cell concentration sensor using a xed control volume between double electrical sensingter Counter [M. Koch, A.G.R. Evans, A. Brunnschweiler, Design and fabrication of a micromachined coulter counter, J. Micromech.Microeng. 9 (1999) 159161] requiring an accurate uid volume measurement or precision ow-rate control, the present cell concentra-tion sensor oers the ow-rate independent method for the cell concentration measurement with counting cells in a xed control volumeof 0.423l l. In the experimental study, we have used the RBC samples of three dierent concentrations and compared the results obtainedmeasurements: (1) with single electrical sensing at a xed ow-rate of 1.2l l/min; (2) with double electrical sensing with a known controlvolume of 0.423 ± 0.01l l. Compared to Hemacytometer, the single and double sensing methods show the maximum concentrationerrors of 8.7% and 10.3%, which are in the measurement error range of Hemacytometer. We also measure the cell concentration withinthe maximum concentration errors of 10.3% in two cases: (1) two dierent ow-rates of 5 and 0.5l 2to1l l/min, respectively. Therefore, we verify the ow-rate independent measurement capability of the present device. Finally, we con-clude that the present sensor can measure cell concentration without the accurate control and measurement of ow-rate.
Interative Consensus 방법에 의한 일반적인 형태의 논리함수 간소화
이동우,이태원 고려대학교 공학기술연구소 1984 고려대학교 생산기술연구소 생기연논문집 Vol.20 No.1
If an original switching function to be minimized is not of Canonical form, it is desirable to obtain the minimized form directly without having to expand it first. This thesis describes an algorithm, the iterative consensus method that well suits to the minimization of a switching function whose form is either arbitrary or Canonical one. Especially, redundancies are immediatly eliminated in process of minimization, therefore the prime implicant selection which is essential to conventional methods, is not required.
한국의 순위출산율에 의한 평균완료 출생아수의 수준 : 1960년 및 1970년 1960, 1970
이동우 한국보건통계학회 1977 보건정보통계학회지 Vol.3 No.1
From the data on the number of women ever-married and the number of children everborn by the time of the census done in 1960, 1966 and 1970, parity progression ratios land the mean number of completed live births were calculated for each cohort respectively. As the 1960 census was undertaken before the Korean National Family Planning Program was introduced, comparison between the parity progression ratio and the mean number of completed live births per ever-married woman from 1966 census data with corresponding ratio and births from 1970 census would indicate if these indices have been changing during the ten-year intercensal period. The levels of parity progression ratio for the women aged 40 to 44 did not show any significant change in the ten-year intercensal period. However the mean number of completed live births for the women with higher education were smaller than that of the women with less education. In Seoul city and Gyunggi province, a neighbouring province of Seoul city, the mean number of completed live births by the 1970 census were smaller than the mean numbers of the rest of provinces.
초등학생의 체력 수준이 체육교과 내용 영역별 선호도에 미치는 영향
이동우,이병곤 한국초등체육학회 2010 한국초등체육학회지 Vol.15 No.3
The purpose of this study was to examine the effect of physical fitness level on the physical education field preferences in the Elementary Students. The physical education field can be classified into track and field, gymnastics, games, expression activities, physical fitness, and health. The total of 480 of elementary school student who are the sixth grade at Mok-po city were surveyed. the data were processed and analyzed with SPSS for WINDOW 12.0. The findings from this study were as follows;First, physical education was the most interesting subject for the students of elementary school. Preference field was game, track and field, physical ability, gymnastics, health, and expression activities in order. Second, the students had a significant difference in the interest in gymnastics activities according to the levels of physical fitness. The preference field was influenced by the gender and physical fitness. Third, there were significant differences of gender and physical fitness in the interest, interesting factor and preference field in track and field activities.