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박인용,이병선 대한전자공학회 1971 전자공학회지 Vol.8 No.1
A survey meter which is used a G-M counter sensitive to beta and gamma radiation is studied. This device is completely transistorized, operated with battery, and can be read directly the 3 full-scale meter range: 2.5, 25 and 250 MR/HR respectively. The collector-coupled monostabel multivibrator consisting of a counting-rate meter circuit, and the astable blocking oscillator consisting of a dc-de converter for power supply are analyzed and derived the design dquations. To improve the resolving time of the G-M counter the device is designed to be triggered by low pulse in the order of 0.5v. G-M 계수관을 이용한 beta와 gamma 선에 민감한 survey meter에 관한 연구이다. 이 장치는 완전 transistor화 되어 있으며 건전지로 동작하게 되어 있고 2.5, 25 및 250MR/HR의 3가지의 full-scale meter range를 직독하게 되어 있다. Counting-rate meter 회로를 이루고 있는 collector 결합 단안정 multivibrator와 전원회로의 de-dc 변환로를 이루고 있는 무안정 blocking 발진기의 해석을 하였고 설계식을 유도하였다. G-M 계수관의 분해시간을 높이기 위하여 0.5v 정도의 낮은 전압으로 triggering할 수 있게 설계하였다.
박인용,차영선 우석대학교 의과대학 1968 우석의대잡지 Vol.5 No.2
This investigation was undertaken to study the possible effect of gamma-amino butyric acid(GABA) on the development of opticokinetic and labyrinthine nystagmus in crabs and rabbits. The following results were obtained: 1. The opticokinetic nystagmus was successfully induced even in the crab by moving a visual stimulus, the nystagmus was much less marked when the stimulus was moved from the open to the other closed eye and was absent when the stimulus was moved from the closed to the open eye. 2. The frequency of nystagmus was markedly decreased by GABA but markedly increased by picrotoxin. 3. The frequency, the duration and the value of labyrinthine nystagmus in the rabbit were greatly increased when the visual stimulus was applied simultaneously with the rotation. This augmentation of labyrinthine nystagmus by rotation was much less marked when a moving visual stimulus was applied from the open to the closed eye or vice versa, as compared to when both eyes are open. 4. The postrotatory nystagmus was markedly inhibited when the visual stimulus was applied during rotation. The postrotatory nystagmus was much less marked when it is associated with the application of visual stimulus than that with the interruption of visual stimulus. 5. The GABA also inhibited the rotatory nystagmus regardless of whether or not it is associated with visual stimulus. 6. Highly significant correlation was noted between the frequency and the duration of labyrinthine nystagmus.
지역독립성 가정의 위배가 IRT 수직척도의 척도변동성에 미치는 영향
박인용 한국교육과정평가원 2013 교육과정평가연구 Vol.16 No.2
문항반응이론(item response theory; IRT)에 기초하여 수직척도를 개발하여 사용할 경우 개발과정에서 모형, 가정의 충족여부, 자료수집방법 등 많은 요인들이 수직척도 개발에 영향을 끼치기 때문에 그 해석에 유의해야 한다. 이 연구에서는 단위검사로 구성된 검사에서의 자료수집방법 선택에 따라 IRT 방법을 적용하여 수직척도를 개발할 때 지역 독립성 가정의 위배가 수직척도의 특성 중 척도변동성에 미치는 영향을 탐색하고자 모의자료를 통해 공통문항설계방법과 척도검사설계방법에서 수직척도를 개발하였다. 연구결과, 지역독립성 가정이 충족되었을 경우에도 자료수집방법 간 척도변동성이 다르게 산출되는 것을 확인하였다. 또한, 가정이 위배되었을 경우에는 두 자료수집방법 모두에서 척도수축 현상이 나타났으며 그 정도는 공통문항설계방법에서 보다 크게 나타난 것을 확인하였다. 따라서 지역독립성 가정의 위배가 심할 때 공통문항설계방법을 사용하여 자료를 수집할 경우 단위검사모형과 같이 단위검사의 효과를 모형화하여 이를 통제하는 모형을 선택하거나 단위검사를 하나의 측정단위로 하여 이를 다분문항으로 취급해 단위검사의 효과를 없애는 다분문항반응모형 등으로 단위검사로 인한 지역독립성 가정 위배의 영향을 최소화해야 할 것이다. When IRT is used to construct a vertical scale, there are many effects of many factor which are model, assumption, data collection design on vertical scale. The purpose of this study is to examine the effect of violation of local independence assumption on scale variability in IRT vertical scales for tests composed of testlet based on different data collection designs. Data collection designs used in this study were scaling test design and common item design. The data were generated in two dimensional compensatory model incorporated testlet effect. In result, when the local independence assumption was satisfied, scale variability yielded different patterns between scaling test design and common item design. Scale variability under both of data collection design showed scale shrinkage when the local independence assumption was not met. And the magnitude of shrinkage in common item design was more than those in scaling test design. Therefore, in practical, when IRT is used to construct a vertical scale with sever violation of local independence assumption, it must be controlled testlet effect using testlet-based scoring or testlet model incoporated testlet effects.