• 한국식품과학회지
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• 제11권3호
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• pp.176-181
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• 1979

전국에서 수집된 1976년산 현미(玄米)시료 112점중 수은과 카드뮴의 농도를 분석, 비교한 결과는 다음과 같다. 1) 현미중 수은 농도의 검출 범위는 불검출${\sim}0.310\;ppm$이었으며 전국평균치는 0.053 ppm이었다. 다만 김포(金浦)지역에서의 시료는 평균치의 $5{\sim}6$배에 이르고 있었다. 2) 현미중 카드뮴 농도의 검출 범위는 흔적${\sim}0.029\;ppm$이었으며 전국 평균치는 0.021 ppm으로서 카드뮴으로 오염되었다고 생각되는 특정 지역은 발견되지 아니하였다.

• 센서학회지
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• 제7권4호
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• pp.225-233
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• 1998

$150^{\circ}C$정도의 높은 온도를 갖는 경우와 같은 열악한 환경 조건하에서의 기어 톱니의 회전수 검출을 위한 센서의 원리, 설계, 응용에 대하여 연구하였다. 톱니 바퀴의 회전의 검출을 위해 바이폴라 실리콘 공정에 의하여 SIMOX 기판위에 한 쌍의 Hall 소자들을 제조하여 차동검출방식을 사용하였다. 제작된 고온용 Hall 소자는 $-40^{\circ}C{\sim}150^{\circ}C$의 넓은 온도 영역을 지니며 동작영역에서의 적감도는 약 510 V/AT이었다. 차동 Hall 소자는 단일 Hall 소자를 사용할 때보다 넓은 온도 영역에 걸쳐 센서와 톱니 바퀴사이의 가능한 최대 거리를 보다 넓게 만들어 주었으며 최대 검출거리는 4mA 의 구동전류에서 약 4.5mm이었다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 추계학술대회
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• pp.703-705
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• 2016

본 논문에서는 광대역 특성을 갖는 이동통신 RF 모듈의 수동 혼변조 왜곡신호를 측정할 수 있는 시스템을 개발하였다. 광대역 특성을 나타내기 위하여 RF 수신단에서 저 잡음 특성과 광대역 특성을 만족하는 수신기를 설계하였으며 RF 수신 단에서 넓은 동적영역(high dynamic range)을 나타내도록 하였다. 설계된 수동 혼변조 왜곡 측정시스템에서 FPGA/DSP를 적용하여 측정된 PIMD신호를 PC에 기록하도록 프로그램 하였다. 650MHz-2700MHz 까지 가변하여 제3차 혼변조 왜곡신호를 측정하여 최고 -138dB를 나타내었다.

• Journal of Microbiology and Biotechnology
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• 제33권10호
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• pp.1257-1267
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• 2023

Although rational genetic engineering is nowadays the favored method for microbial strain improvement, building up mutant libraries based on directed evolution for improvement is still in many cases the better option. In this regard, the demand for precise and efficient screening methods for mutants with high performance has stimulated the development of biosensor-based high-throughput screening strategies. Genetically encoded biosensors provide powerful tools to couple the desired phenotype to a detectable signal, such as fluorescence and growth rate. Herein, we review recent advances in engineering several classes of biosensors and their applications in directed evolution. Furthermore, we compare and discuss the screening advantages and limitations of two-component biosensors, transcription-factor-based biosensors, and RNA-based biosensors. Engineering these biosensors has focused mainly on modifying the expression level or structure of the biosensor components to optimize the dynamic range, specificity, and detection range. Finally, the applications of biosensors in the evolution of proteins, metabolic pathways, and genome-scale metabolic networks are described. This review provides potential guidance in the design of biosensors and their applications in improving the bioproduction of microbial cell factories through directed evolution.

• 한국수산과학회지
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• 제32권3호
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• pp.256-260
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• 1999

본 연구는 EEC 4-plate법과 그 변법 그리고 식품공전상 간이검사법으로써 어류질병의 예방 및 치료에 사용되는 28종류의 항균물질에 대한 최저 검출한계를 서로 비교하여 어체내 잔류 항균물질의 최적 간이검사법 (bioassay)으로서의 유효성을 확인하고자 하였다. 식품공전상 간이검사법은 PCs에 뛰어난 검출감도를 나타내었으며 AGs에 대하여 좋은 감도를 보였으나 TCs, MLs, NFs, QNs에 대해서는 낮은 검출감도를 나타내었다. 한편, SAs에 대하여는 대단히 저조한 감도를 보였다. EEC 4-plate변법은 TCs에 대하여 우수한 검출감도를 나타내었다. EEC 4-plate법 및 그 변법은 PCs, MLs, NFs, QNs, SAs에 대하여 상대적으로 높은 검출감도를 나타내었다. 시험법들은 모두 CMs에 대하여는 검출감도가 낮았다. 결국 EEC 4-plate 변법이 여러계열의 항균물질에 대해 검출감도가 뛰어나고 항균활성의 범위가 넓어 어체내 잔류 항균성물질을 가장 유효하게 스크리닝할 수 있는 간이검사법으로 확인되었다.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.154-157
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• 2003

In order for testing faults of combinatorial logic circuit, the authors have developed a new diagnosis method: "Neural Network (NN) fault diagnosis", based on fm error back propagation functions. This method has proved the capability to test gate faults of wider range including so called SSA (single stuck-at) faults, without assuming neither any set of test data nor diagnosis dictionaries. In this paper, it is further shown that what kind of fault models can be detected in the NN fault diagnosis, and the simply modified one can extend to test delay faults, e.g. logic hazard as long as the delays are confined to those due to gates, not to signal lines.

• Journal of the Optical Society of Korea
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• 제16권1호
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• pp.47-52
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• 2012

The use of a $Ti:LiNbO_3$ symmetric Mach-Zehnder interferometric intensity modulator with a push-pull lumped electrode and a plate-type probe antenna to measure an electric field strength is described. The modulator has a small device size of $46{\times}7{\times}1mm$ and operates at a wavelength of $1.3{\mu}m$. The output characteristic of the interferometer shows the modulation depth of 100% and 75%, and $V_{\pi}$ voltage of 6.6 V, and 6.6 V at the 200 Hz and 1 KHz, respectively. The minimum detectable electric field is ~1.84 V/m, ~3.28 V/m, and ~11.6 V/m, corresponding to a dynamic range of about ~22 dB, ~17 dB, and ~6 dB at frequencies of 500 KHz, 1 MHz and 5 MHz, respectively.

• 약학회지
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• 제3권1호
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• pp.45-47
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• 1957

A paper chromatographical method is studied to detect As and Sb from a mixed sample applying the principle of Gutzeit's. After spoting the mixed $AsH_3$ sample on the $AgNO_3$ band of paper strip (6 mm $\times$ 300 mm of Whatman No.52 or Toyo No.2 filter paper), the strip is developed by ascending method using N-HCl solution as a developing soluvent. The color spot detection of As and Sb is done by exposing the dried chromatogram to $H_2S$ stream. According to the experiments, the detectable minimum range of As is 3 micrograms and that of Sb is 15 micrograms. The yellow phosphorous interfers to the color spot detection of As and Sb, so that, previously the most of yellow phosphorous from the sample should be removed out.

• 제어로봇시스템학회논문지
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• 제16권4호
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• pp.368-373
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• 2010

A new indoor mobile robot localization method is presented. Robot recognizes well designed single color landmarks on the ceiling by vision system, as reference to compute its precise position. The proposed likelihood prediction based method enables the robot to estimate its position based only on the orientation of landmark.The use of single color landmarks helps to reduce the complexity of the landmark structure and makes it easily detectable. Edge based optical flow is further used to compensate for some landmark recognition error. This technique is applicable for navigation in an unlimited sized indoor space. Prediction scheme and localization algorithm are proposed, and edge based optical flow and data fusing are presented. Experimental results show that the proposed method provides accurate estimation of the robot position with a localization error within a range of 5 cm and directional error less than 4 degrees.

• 한국동물위생학회지
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• 제21권3호
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• pp.261-266
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• 1998

A method for the determination of noboviocin in milk was presented by high performance liquid chromatography(HPLC). The novobiocin in the spiked sample was extracted with methanol and evaporated under vacuum. After evaporating, the residue was mixed with distilled water for 2$m\ell$, filtrates with 0.45$\mu\textrm{m}$ acrodisc was injected into HPLC. The results obtained were as follows ; 1. The calibration curve of novobiocin was showed constantly linear(r 0.999) in the range of 100~500ng/$m\ell$. 2. The mean recovery rate of novobiocin from the spiked milk sample were 88~98%. 3. The coefficients of variation were 2.6~5.8% 4. The lowest detectable limit of novobiocin was 25ppb.