• Asian Journal of Atmospheric Environment
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• 제11권4호
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• pp.283-299
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• 2017

An analytical method using high-performance liquid chromatography (HPLC) with fluorescence (FL) detection was developed for simultaneously analyzing 10 polycyclic aromatic hydrocarbons (PAHs) and 18 nitro-derivatives of PAHs (NPAHs). The two-dimensional HPLC system consists of an on-line clean-up and reduction for NPAHs in the 1st dimension, and separation of the PAHs and the reduced NPAHs and their FL detection in the 2nd dimension after column-switching. To identify an ideal clean-up column for removing sample matrix that may interfere with detection of the analytes, the characteristics of 8 reversed-phase columns were evaluated. The nitrophenylethyl (NPE)-bonded silica column was selected because of its shorter elution band and larger retention factors of the analytes due to strong dipole-dipole interactions. The amino-substituted PAHs (reduced NPAHs), PAHs and deuterated internal standards were separated on polymeric octadecyl-bonded silica (ODS) columns and by dual-channel detection within 120 min including clean-up and reduction steps. The limits of detection were 0.1-9.2 pg per injection for PAHs and 0.1-140 pg per injection for NPAHs. For validation, the method was applied to analyze crude extracts of fine particulate matter ($PM_{2.5}$) samples and achieved good analytical precision and accuracy. Moreover, the standard reference material (SRM1649b, urban dust) was analyzed by this method and the observed concentrations of PAHs and NPAHs were similar to those in previous reports. Thus, the method developed here-in has the potential to become a standard HPLC-based method, especially for NPAHs.

• 한국정보통신학회논문지
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• 제7권8호
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• pp.1823-1830
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• 2003

본 논문에서는 동공 검출 기술을 이용한 얼굴 검출 방법을 제안하고자 한다. 동공 검출기는 눈의 역 반사 특성을 이용한 능동적 조명을 사용하여 검출을 용이하도록 하였고. 제안된 방법의 검출 범위는 소형 컴퓨터나 무인 정보 단말기 등의 활용에 적합하도록 하였다. 동공 후보 영역을 계산하여 검출한 후, 학습 규칙을 사용하여 얼굴에 대응하는 두 개의 지점을 선택하도록 하였다. 얼굴 검출 성능을 증명하기 위하여, 얼굴의 최대 돌출 부위를 지정 할 수 있는 이중 모드의 얼굴 추적 장치를 개발하였다. 추정치 와 복합 얼굴 검출기의 측정치를 결합하여 특징 관계를 추적함으로 처리의 안정성을 높이었다. 또한, 실시간으로 서보의 제어장치를 원격 조정하여 항상 카메라가 이미지의 중앙을 추적하도록 함으로서 얼굴의 위치를 추정할 수 있도록 하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.449-452
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• 2000

The economical detection of dual-tone multifrequency(DTMF) signals is an important factor when developing cost-effective telecommunication equipment. Each channel has independently a DTMF receiver, and it informs the detected signal to processors. This paper analyze the power spectra and evaluate the performance of DTMF receiver by using the quick Fourier transform(QFT) algorithm. As experimental results, it show the improved performance to the DTMF receivers and reduce memory waste and process the real-time.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 A
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• pp.638-640
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• 1996

This paper presents microprocessor-based Digital Position Detection Unit using the inductive radio line and the antennas in train signaling system. This comprises the Fail-Safe system due to the dual controlled system to drive with safe-side even in events of faults, and designs the FSC(failure safe comparator). And the method of Markov Modeling is described for the reliability evaluation of system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.445-447
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• 2005

MCMA(modified constant modulus algorithm) accomplishes blind equalization and carrier phase recovery simultaneously. But, the error level of MCMA is not zero when the equalizer converges completely. Because the MCMA uses a special signal point instead of a original signal point. MCMA-DO(decision-directed) improves the steady-state performance but the performance of equalizer is decided by switching time between the MCMA and the DD. In this paper, according to the residual ISI(intersymbol interference) of the equalizer output, the most suitable switching time is decided automatically.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1998년도 제15회 음성통신 및 신호처리 워크샵(KSCSP 98 15권1호)
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• pp.159-164
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• 1998

We proposes a new detecting algorithm of DTMF tone for low bit ate vocoder so that we use DTMF tones for signalling inthe digital network. Using DTMF tones for signalling, we could not change the conventional IS-95 protocol and control the mobile phone. We apply the root finding to detection of formants and bandwidth to search whether DTMF tones or voice and moreover to find what's kinds of DTMF tones, for instance 1, 2, 3, ......., #, *, A, B, ...., etc. Consequently, proposed method has a good result which is 0.000944% average error rate. It is satisfied with rcommended error rate in ITU-T($\pm$1.8%).

• 대한핵의학회지
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• 제32권3호
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• pp.211-224
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• 1998

The role of scintigraphic imaging has moved from the detection of lesions to the tissue-specific characterization of lesions over the past 2 decades. Major advances in nuclear medicine imaging include: 1) positron imaging, 2) improved instrumentation, such as the use of multidetector (dual or triple head) gamma cameras for single photon emission computed tomography, and 3) development of numerous new radiopharmaceuticals for positron or single photon imaging (labeled glucose analogue, amino acids, fatty acids, hormones, drugs, receptor ligands, monoclonal antibodies, etc). These advances have resulted in a significantly improved efficacy of radionuclide techniques for the evaluation of various tumors, including those within the liver. The current role of nuclear medicine in the evaluation of focal hepatic tumors is reviewed in this article with an emphasis on the clinical applications of various tracer studies and imaging findings.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권9호
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• pp.2424-2441
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• 2012

In this paper, we propose a fake iris detection method that combines the optical and textural features of the human eye. To extract the optical features, we used dual Purkinje images that were generated on the anterior cornea and the posterior lens surfaces based on an analytic model of the human eye's optical structure. To extract the textural features, we measured the amount of change in a given iris pattern (based on wavelet decomposition) with regard to the direction of illumination. This method performs the following two procedures over previous researches. First, in order to obtain the optical and textural features simultaneously, we used five illuminators. Second, in order to improve fake iris detection performance, we used a SVM (Support Vector Machine) to combine the optical and textural features. Through combining the features, problems of single feature based previous works could be solved. Experimental results showed that the EER (Equal Error Rate) was 0.133%.

• Bulletin of the Korean Chemical Society
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• 제33권11호
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• pp.3696-3700
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• 2012

The colorimetric and fluorescent cyanide recognition properties of 2-[(9-ethyl-9H-carbazol-3-yl)methylene]-propanedinitrile (1) in $CH_3CN-H_2O$ (2/1, v/v, HEPES 10 mM, pH = 7.0) solution were evaluated. The optical recognition process of probe 1 exhibited high sensitivity and selectivity to cyanide ion with the detection limit of $2.04{\times}10^{-6}$ M and barely interfered by other coexisting anions. The sensing mechanism of probe 1 is speculated to undergo a nucleophilic addition of cyanide to dicyanovinyl group present in compound 1. The colorimetric and fluorescent dual-modal response to cyanide makes probe 1 has a potential utility in cyanide detection.

• 한국통신학회논문지
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• 제21권1호
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• pp.161-174
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• 1996

CDMA 역방향 링크에서 슬롯 모드로 전송되는 프리엠블을 탐색하기 위한 최대우도 동기획득 방식의 성능을 분석한다. CDMA 복조기 출력의 통계적 특성에 기초하여 신호검출 성능을 주파수 선택성 레일라이 페이딩 채널에서 다중 $H_1$ 셀의 경우에 대해 이론적으로 분석한다. 복조기 출력으로 구성되는 판정 변수의 확률밀도 함수를 수신신호의 페이딩 특성을 고려하여 단일 및 이중 안테나 시스템의 경우에 대해 유도하고 후치 적분의 수. 페이딩 율 및 안테나 다이버시티에 따른 효과를 고려하여 성능을 분석한다.