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김아희(A-Hee Kim),김지선(Ji-Sun Kim),정구인(Gu-In Jung),최주현(Ju-Hyeon Choi),이태희(Tae-Hee Lee),박성준(Sung-Joon Park),전재훈(Jae-Hoon Jun) 한국컴퓨터정보학회 2013 한국컴퓨터정보학회 학술발표논문집 Vol.21 No.1
본 논문에서는 광학적 방법을 이용하여 정색반응을 정량적으로 측정할 수 있는 방법을 제시한다. 정색반응은 발색, 변색의 현상을 일으키는 화학 변화로 시료 용액에 시약을 더하여 특수한 빛을 나타내게 하여, 물질을 정성적으로 검출하는데 이용된다. 하지만 정색반응 결과로 나타난 색상은 사람마다 색구별이 다르므로 정확한 양을 알 수는 없다. 본 연구에서는 시료의 양에 따라 색상 변화의 미세한 차이를 PICkit Serial Analyzer를 사용하여 색상을 수치화하여 시료의 양에 따른 색의 변화를 정량적으로 측정하였다.
김아희(A-Hee Kim),김지선(Ji-Sun Kim),오한별(Han-Byeol Oh),김준식(Jun-Sik Kim),고봉준(Bong-Jun Goh),이은숙(Eun-Suk Lee),정현철(Hyon-Chel Jung),최주현(Ju-Hyeon Choi),백진영(Jin-Young Baek),전재훈(Jae-Hoon Jun) 대한전기학회 2015 전기학회논문지 Vol.64 No.4
The measurement and analysis of angular change have been studied in many fields. This study developed an angle measurement technique with optical fiber and photodiode. The position and attached angle of photodiode were investigated to find the proper combination of parameter. The results showed that the increased measuring range was achieved when the position of detector was away from the center of rotation. Inverse mathematical model was used to obtain angular changes with an optical fiber. The applications of this study include in optical sensor, joint angle measurement, and sport science.
이태희(Tae-Hee Lee),김지선(Ji-Sun Kim),정구인(Gu-In Jung),최주현(Ju-Hyeon Choi),오한별(Han-Byeol Oh),김아희(A-Hee Kim),정현철(Hyon-Chel Jung),조영빈(Yeong Bin Cho),전재훈(Jae-Hoon Jun) 대한전기학회 2014 전기학회논문지 Vol.63 No.8
Many studies have been done to measure and analyze color for various purposes. Visual assessment has lack of objectivity and the equipment for color measurement is very expensive. In this study, we developed a device for quantitative analysis of the color using optical elements. With the color sensor, the ratio of RGB was calculated by measuring the light intensity that is reflected from an object. Inverse transformation of optical signal was performed to detect the color density. The suggested color analyzer can detect color information as well as sample concentration. Results of this study are expected to be used in various medical fields such as pH indicator and urine analysis.
김지선(Ji-Sun Kim),정구인(Gu-In Jung),이태희(Tae-Hee Lee),최주현(Ju-Hyeon Choi),오한별(Han-Byeol Oh),김아희(A-Hee Kim),박희정(Hee-Jung Park),김경섭(Kyung-Seop Kim),전재훈(Jae-Hoon Jun) 대한전기학회 2013 전기학회논문지 Vol.62 No.9
The purpose of this study is to find the new method for estiming the spatial variations in a light source with utilizing the optical fiber sensory system. With this aim, firstly the asymmetry in the beam profile of a light source is evaluated by using the tipped optical fiber with 0, 10, 20, 30, 40, 45-degree angle. Secondly the variation of position in a light source is estimated by adjusting the relative position between the light source unit (XYZ stage, LED, Optical fiber) and the receiver unit (Photodiode, XYZ stage). Our experimental results show that the spatial variation of a light source can be resolved in terms of the variations in beam profile with varying the tip angle of an optical fiber and adjusting the relative distance between the light source unit and the receiver.
최주현(Ju-Hyeon Choi),김지선(Ji-Sun Kim),정구인(Gu-In Jung),이태희(Tae-Hee Lee),김아희(A-Hee Kim),오한별(Han-Byeol Oh),박희정(Hee-Jung Park),김경섭(Kyung-Seop Kim),전재훈(Jae-Hoon Jun) 대한전기학회 2013 전기학회논문지 Vol.62 No.9
The light intensity which represents the relative amount of brightness and darkness is very important feature to discern the color hue and its relevant information. With this aim, we devise a new optical system and method to analyze the light intensity. Our suggested system including a phototransistor and white-high-brightness chip light-emitting diode intend estimate the contrast value utilizing Image Research Institute(I.R.I.) Hue & Tone samples which includes 120 color sheets arranged by the color hue and tone. As a result, we confirmed that the brightness of the color checker can be accurately estimated by a high-brightness light-emitting-diode optical system.
정구인(Gu-In Jung),김지선(Ji-Sun Kim),이태희(Tae-Hee Lee),최주현(Ju-Hyeon Choi),오한별,김아희(A-Hee Kim),전재훈(Jae-Hoon Jun) 대한전기학회 2014 전기학회논문지 Vol.63 No.7
The measurement of joint angle is important to evaluate the patient’s disability. The modified fiber tip and light propagation of the developed fiber sensor were investigated to increase the range of angle detection. Different shapes of fiber tips were manufactured with a polishing machine to deliver light signal in various patterns. Output signals were analyzed to obtain joint angle change with inverse polynomial models. The measured joint angles were displayed with LabVIEW program and the reliability was tested by comparing with a commercial angle sensor. This method can be used in rehabilitation field to determine patient’s progress.