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권성원 ( Sung Won Kwon ),박세일 ( S . I . Park ),조용명 ( Y . M . Cho ),강전홍 ( J . H . Kang ) 한국센서학회 1996 센서학회지 Vol.5 No.4
Planar multi-junction thermal converters were fabricated for precise measurements of the ac voltage and current by an ac-do transfer method. A heater and a thermocouple array were fabricated onto a sandwiched membrane, Si₃N₄ (200 nm) / SiO₂(400 nm) / Si₃N₄(200 nm, a thickness of 0.8 ㎛ and a size of 2 x 4 ㎟, which is supported by a surrounding frame. The NiCr heater is located at the center of the membrane vertically. Hot junctions of 48 ∼ 156 pairs of thermocouples (Cu-CuNi44) are located near or onto the heater, and cold junctions are located onto the silicon frame. Output of the thermal converters for 10 mA do input was 76 mV ∼ 382 mV dependent on a model, and short term stability of the outputs was ±5 ∼ 15 ppm/ 10 min with 5 mA do input. Responsivity in air was in the range of 3.9 ∼ 14.5 V/W. Responsivity of the model BF48 in air which has 48 thermocouples was 2 times or greater than that of 3 dimensional multi-junction thermal converter in vacuum which has 56 thermocouples. AC-DC transfer differences with an input of 10 mA or less were less than ±1 ppm in the frequency range from 5 Hz to 2 kHz, and about 2 ∼ 3 ppm at 5 kHz and 10 kHz.
교류 저전압 표준용 교류-직류 변환기의 입력임피던스 평가기술 개발
權聖遠(Sung-Won Kwon),鄭在甲(Jae Kap Jung),李相和(Sang-Hwa Lee),金紋奭(Myungsoo Kim),金漢俊(Han Jun Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
An AC-DC transfer standard(TS) is used for the AC voltage standard in the range of 2 ㎷ to 1000 V below 1 ㎒. Micro-potentiometer(μPot) is used to evaluate the ac-dc transfer difference(ADD) of the TS below 200 ㎷ range. The ADD of the TS were changed by the loading effect caused from the input impedance change of the TS depend on frequency. An input impedance evaluation technique of the TS using μPot has been developed.
권성원(Kwon, Sung-Won) 한국레저사이언스학회 2021 한국레저사이언스학회지 Vol.12 No.3
본 연구는 초등학교 학생건강체력평가 근지구력(윗몸말아올리기) 검사에서 측정자의 전문성에 따른 측정값 차이를분석하고, 검사자간 신뢰도를 평가하는데 목적이 있다. 이를 위해 체육전담교사 1명, 담임교사 6명, 학생 144명이측정에 참여하였다. 수집된 자료는 SPSS 26. 통계 프로그램을 이용하여 독립표본 t-검정과 상관분석을 실시하였다. 또한 측정자의 전문성에 따른 체력기록의 등급차이를 확인하기 위해 교차분석을 활용하였다. 본 연구의 결과는 다음과 같다. 첫째, 담임교사는 준거측정자에 비해 초등학생들의 근지구력(윗몸말아올리기)을 과대측정하고 있다. 둘째, 여학생 기록과 5학년 기록에서 검사자간 신뢰도는 매우 낮다. 셋째, 담임교사와 준거측정자의 근지구력 측정기록에따라 학생들의 체력등급은 달라진다. 담임교사의 기록은 4-5등급의 저체력 비율은 적은 반면, 2-3등급의 비율로많이 분류된다. 평가자에 따라 학생들의 근지구력은 다른 결과를 나타내고 있으며, 체력등급 또한 달라진다. 따라서정확한 체력결과를 위해 정확한 체력 측정이 우선시 되어야 할 것이며, 본 연구 결과는 학생건강체력평가 측정지침개선 및 현장에서의 정확한 측정을 위한 유용한 자료로 활용될 수 있기를 기대한다. The purpose of this study is to evaluate the difference and reliability of measured values between examiners in the muscular endurance(curl-ups) test of elementary school student health fitness test. For this purpose, one physical education teacher, six homeroom teachers, and 144 students participated in the measurement. The collected data were correlated with the independent sample t-test using the SPSS 26. statistical program. In addition, chi-square was used to confirm the difference in grades of physical fitness records according to the measurer s expertise. The results of this study are as follows. First, the homeroom teacher overestimates the muscular endurance of elementary school students compared to the reference measurer. Second, Inter-rater reliability is very low in the female student records and the fifth grade records. Third, students physical fitness grades vary according to the records of measuring muscular endurance of the homeroom teacher and the reference measurer. Depending on the evaluator, students muscular endurance shows different results, and their physical fitness level also varies. Therefore, accurate physical fitness measurement should be priority for accurate physical fitness results.
權聖遠(Sung-Won Kwon),鄭在甲(Jae-Kap Jung),李相和(Sang-Hwa Lee),金明壽(Myungsoo Kim) 대한전기학회 2008 전기학회논문지 Vol.57 No.6
A calculable potential transformer (PT) with nominal ratio error in wide range of -10 % to +10 % has been developed on basis of theoretical calculation of ratio error by the number of windings. The developed PT can be used to evaluate the linearity and accuracy of the PT comparator by comparing both the theoretical and experimental values of the PT which have exactly same ratio errors in nominal and calculated values. The PT has been applied for calibration and correction of the PT comparator up to wide ratio error range of -10 % to +10 %. This portable PT is very convenient to carry to the power industry for the on-site calibration of the PT comparator.