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다채널 LAPS용 pH 변화량 검출을 위한 적분 방식의 알고리듬 제안
배상곤,이승하,강신원,조진호,Bae, Sang-Kon,Lee, Sung-Ha,Kang, Shin-Won,Cho, Jin-Ho 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.6
We proposed the detection method of pH variations by integrating a photocurrent characteristic curve, instead of finding an inflection point by differentiating it in LAPS system. By a simulation of the performance of the proposed method, we verified that it had 80 and 1000 times higher sensitivity and resolution than a conventional method. Then, with the implemented system based on the simulation results, we measured a pH variation which was given rise to a potential change on the LAPS surface exposed to 2-0.03125[mg/ml] enzyme solutions. As results, we observed that the proposed method has a higher sensitivity and resolution of 3.76-0.08[pH/min] pH variations than 3.79-0.27[pH/min] for conventional method with same samples. 본 논문에서는 시간-농도 분해능을 필요로 하는 LAPS장치에 있어서, 광전류 특성 곡선의 변곡점을 찾아 이동량을 측정하는 대신에 특성 곡선의 적분값 변화를 이용하여 pH변화를 검출하는 방식을 제안하였다. 제안된 방식의 성능 확인을 위하여 시뮬레이션을 수행하였으며, 이로부터 약 80배의 감도 및 1000배의 분해능 증가를 확인하였다. 수행된 결과를 바탕으로 측정 시스템 및 2-0.03125 [mg/ml]농도의 효소가 묻은 스트립을 제작하여 측정한 결과, 동일한 샘플수에 대해 기존의 3.79-0.27[pH/min]보다 더 높은 3.76-0.08 [pH/min]의 pH변화감도를 측정할 수 있었다.
점증부하 에르고미터 운동 중 심박수역치(heart rate threshold)를 이용한 무산소성역치(HR<SUB>LT</SUB>, HR<SUB>VT</SUB>) 추정식 개발
남상석(Nam, Sang-Seok),함주호(Ham, Joo-Ho),박훈영(Park, Hun-Young),배상곤(Bae, Sang-Kon),고병훈(Ko, Byung-Hoon),김연호(Kim, Youn-Ho),선우섭(Sunoo, Sub) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.5
In this study, we conducted graded maximum exercise test to normal people(male 112, female 108) using cycle ergometer. We calculated heart rate which corresponds heart rate threshold(HRT) and lactate threshold(LT), ventilation threshold(VT) through the test. After that, we divided data(n=220) randomly using Bernoulli"s trials. 70%(actually 70.5%) of data were used as analysis data(male 79, female 73) and 30%(actually 67.6%) were used as validity test data(male 33, female 35). Using analysis data, we conducted simple regression analysis. Independent variable was HRT and dependent variable was HRLT, HRVT which represents heart rate corresponds anaerobic threshold. The adjusted R<SUP>2</SUP> was mean 72.3% and SEE was mean 8.96 bpm. Moreover, in validity test, SEE was 8.54bpm which was similar to developed regression model. So we identified developed regression model is valid. These results show that HRT is meaningful variable to predict HRLT, HRVT and very important variable to estimate anaerobic threshold.
마이크로 센서용 다채널 전해질 분석기의 샘플챔버 개선 및 샘플상호간의 간섭현상 보정
박준경,성기웅,배상곤,진경찬,김명남,손병기,조진호 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
In this paper, the sample chamber for multichannel electrolyte analyzing system was designed and the correction algorithm for interference among samples was proposed. The sample chamber was designed to replace the ISFET sensor more easier. The principles of design were the structural independency of each channel and the shield of sample solution from air contact. The correction algorithm could reject the interference effect of mixed sample solution and compensate the voltage difference between single electrolyte solution and mixed electrolyte solution. To approve the proposed algorithm, the several experiments were carried out under the condition of mixed samples. We acknowledged that with our proposed algorithm, the sensor output influenced by mixed electrolyte solution was improved with measurement accuracy.
LAPS 를 위한 pH 이미지 검출용 격자무늬 광자극 방법
강신원,조진호,배상곤 한국센서학회 2001 센서학회지 Vol.10 No.6
In this paper, we proposed a new detection method of pH image to effectively measure a 2-dimensional pH distribution of test materials by irradiating an frequency modulated light to LAPS using a reticle. It could measure simultaneously signals in one line by applying a modulated light having difference frequency for each pixel using a frequency modulating reticle, and calculating an amplitude with respect to a frequency component by the light source. To experiment the proposed method, we designed and implemented a reticle considering of a LAPS's characteristic, and reconstructed an image by frequency analysis using the implemented reticle and test pattern image. As a result, we verified that the proposed method using the reticle was able to detect 30 times faster for a 30 x 30 pixels pH image having a PSNR of 22-24 [dB] than conventional method .
ISEFT 마이크로센서용 샘플챔버 설계 및 4채널 전해질 분석기의 구현
김창수,조진호,손병기,조병욱,배상곤,이호신,원철호,채승표,김명남 한국센서학회 1997 센서학회지 Vol.6 No.4
In this paper, a sample chamber which provide easy replacement of ISFET sensor and consume only small sample volume for electrolyte analysis is designed and a 4-channel electrolyte analyzer employing 2-point calibration method is implemented. In addition, we proposed sample loading detection circuit for minimizing sample and calibration solutions and implemented it. Developed electrolyte analyzer consists of control system part and flow system part. For the effective control of the developed hardware, system software is developed as three individual routines ; measuring routine, calibration routine and washing routine.
다채널 LAPS 제적 및 이를 이용한 pH 변화량 검출 시스템 구현
박일용,조진호,박영식,강신원,배상곤,장수원,이승하 한국센서학회 2001 센서학회지 Vol.10 No.4
LAPS is a device which is dependent on the bias potential between a pH sensitivity and alternating photocurrent. We implemented the multichannel LAPS device and the detection system which was able to effectively measure the sensor's output by a synchronized detection circuit and multiple methods. The implemented LAPS was structured the multiple sensing sites for analyzing a various components simultaneously. And the system included a time-division method using one pre-amplifier being able to detect the multichannel pH concentration preserving a high S/N ratio and a control part. System hardware consists of a pre-amplifier, digital unit and sensor unit, and software consists of a system program and PC program. As results, we verified the successful operations of system including an implemented pre-amplifier and signal processing units.