• 한국인터넷방송통신학회논문지
• /
• 제17권5호
• /
• pp.125-130
• /
• 2017

PLC 등의 현장제어기기는 주요 이벤트 정보를 로깅하는 기능이 없기 때문에 사고분석이 힘들다. 따라서, PLC, IED와 같은 현장제어기기의 주요 이벤트 정보를 로깅하여, 사이버 사고 발생 시 분석이 가능한 정보 확보가 필요하다. 이벤트 로깅을 위한 현장제어기기(임베디드기기) 통신 프로토콜을 분석하기 위해서는 프로토콜 애널라이저(분석기)가 필요하다. 그러나 Wireshark와 같은 기존의 분석기는 페이로드 데이터 기반의 다양한 프로토콜 분석 및 분류가 어렵고 이벤트 로깅을 위한 대용량의 데이터 식별 및 추출을 처리하기에는 어려움이 있다. 따라서, 본 논문에서는 대용량의 이벤트 로깅을 위한 빅데이터 기반 현장제어기기 통신프로토콜 페이로드 데이터 추출을 위한 시스템을 연구개발하였다.

• 대한화학회지
• /
• 제36권6호
• /
• pp.840-848
• /
• 1992

이온성 거대고리 리간드, diaza-18-crown-6-diisopropionic acid(K22DAP)를 합성하였다. 이 화합물의 양성자화 상수와 몇 가지 란탄족원소와의 안정도 상수를 전위차적정 방법으로 측정하였다. 양성자화 상수는 log$K_1$ = 9.05, log$K_2$ = 8.37, log$K_3$ = 1.88 및 log$K_4$ = 0.99이고, La(III), Nd(III), Gd(III) 및 Lu(III)와의 안정도 상수 (logKML)는 각각 11.14, 11.43, 11.74 및 10.88이었다. 거대고리 이온운반 물질로서 K22DAP를 사용하고 TTA(thenoyltrifluoroacetone)를 추출제로 하여 란탄(III)족 이온의 추출성질을 연구하였다. pH 8.0의 수상에서 La(III)과 Nd(III)이온은 주로 삼성분착물 Ln(K22DAP)TTA를 형성하였다.

• 인터넷정보학회논문지
• /
• 제20권3호
• /
• pp.85-92
• /
• 2019

In this paper, we extract the quantitative relation data of activities from the workflow event log file recorded in the XES standard format and connect them to rediscover the workflow process model. Extract the workflow process patterns and proportions with the rediscovered model. There are four types of control-flow elements that should be used to extract workflow process patterns and portions with log files: linear (sequential) routing, disjunctive (selective) routing, conjunctive (parallel) routing, and iterative routing patterns. In this paper, we focus on four of the factors, disjunctive routing, and conjunctive path. A framework implemented by the authors' research group extracts and arranges the activity data from the log and converts the iteration of duplicate relationships into a quantitative value. Also, for accurate analysis, a parallel process is recorded in the log file based on execution time, and algorithms for finding and eliminating information distortion are designed and implemented. With these refined data, we rediscover the workflow process model following the relationship between the activities. This series of experiments are conducted using the Large Bank Transaction Process Model provided by 4TU and visualizes the experiment process and results.

• Journal of Pharmaceutical Investigation
• /
• 제39권1호
• /
• pp.65-71
• /
• 2009

The aim of the present study was to evaluate the bioequivalence of two domperidone maleate tablets, Motilium-$M^{(R)}$ Tablet (Janssen Korea Ltd., reference product) and $Toriem^{(R)}$ Tablet (Daewon Pharm. Co., Ltd., test product). Domperidone was extracted by liquid-liquid extraction using tert-butyl methyl ether and separated in less than 3 min on $C_{18}$ reverse-phase column using an isocratic elution. A tandem mass spectrometer, as detector, was used for quantitative analysis in positive mode by a multiple reaction monitoring mode to monitor the m/z $426.1{\rightarrow}119.1$ and the m/z $837.4{\rightarrow}158.2$ transitions for domperidone and the internal standard (roxithromycin), respectively. Calibration curves, from $0.05{\sim}50$ ng/mL of domperidone, showed correlation coefficients (r) higher than 0.9941. Intra day and inter day precision (C.V. %) for quality control were ranged from 10.04 to 16.09% and from 10.87 to 18.69%, respectively. The lower limit of quantification (LLOQ) of domperidone was 0.05 ng/mL. The method described is precise and sensitive and has been successfully applied to the study of bioequivalence of domperidone in 24 healthy Korean volunteers. Twenty-four healthy male Korean volunteers received a single dose of each medicine ($2{\times}12.72\;mg$ domperidone maleate) in a $2{\times}2$ crossover study. There was a one-week washout period between the doses. Plasma concentrations of domperidone were monitored for over a period of 24 hr after the administration. $AUC_{0-t}$ (the area under the plasma concentration-time curve) was calculated by the linear trapezoidal rule. $C_{max}$ (maximum plasma drug concentration) and $T_{max}$ (time to reach $C_{max}$) were compiled from the plasma concentration-time data. The 90% confidence intervals for the log transformed data were within acceptable range of log 0.8 to log 1.25 (e.g., $log\;0.92{\sim}log\;1.05$ for $AUC_{0-t}$, $log\;0.81{\sim}log\;1.05$ for $C_{max}$). The major parameters, $AUC_{0-t}$ and $C_{max}$ met the criteria of KFDA for bioequivalence indicating that $Toriem^{(R)}$ tablet is bioequivalent to Motilium-$M^{(R)}$ tablet.

• 한국환경농학회:학술대회논문집
• /
• 한국환경농학회 2011년도 30주년 정기총회 및 국제심포지엄
• /
• pp.281-281
• /
• 2011

• 산업식품공학
• /
• 제23권2호
• /
• pp.112-117
• /
• 2019

배추즙을 유산균 배양 배지로 사용하기 위하여 배춧잎을 구연산 3%, 에탄올 7% 혼합용액으로 10분간 교반하여 세척하고 3분간 탈수하여 착즙한 결과, 세척수율은 80.82%, 착즙수율은 79.32%로 전체수율이 64.11% 이었고, 배추즙의 일반세균수가 3.69 log CFU/g으로 2.84 log CFU/g 감소하였고 유산균수가 2.01 log CFU/g으로 2.43 log CFU/g 낮아졌으며, 염도가 0.26%였고, pH가 2.98로 변화하여 상온에서 8일간 보관하면서 pH와 미생물수의 변화가 유의적이지 않아서 유산균 배양용 배지로 적합할 것으로 보인다. 또한 배춧잎은 구연산-에탄올 용액으로 세척하는 것이 구연산-에탄올-소금 용액으로 세척하는 것보다 수율과 미생물 감균효과가 더 높았다.

• Bulletin of the Korean Chemical Society
• /
• 제24권10호
• /
• pp.1495-1500
• /
• 2003

Equilibria and applications of a synergistic extraction were studied for the determination of a trace lithium by using thenoyltrifluoroacetone (TTA) and trioctylphosphine oxide (TOPO) as ligands. Several equations were derived for the extraction of lithium into m-xylene as a phase of Li-TTA·mTOPO adduct. Distribution coefficients and extraction constant were determined together with a stability constant of the adduct. The adduct was quantitatively extracted from the basic solution of higher than pH 9 by shaking for 30 minutes. m-Xylene was selected as an optimum solvent by comparing the extraction efficiency among several kinds of organic solvents. The stability constant (${\Beta}_2$) for Li-TTA/2TOPO was 150 times higher than Li-TTA/TOPO. The distribution coefficient of Li-TTA/2TOPO into m-xylene was 9.12 and the logarithmic extraction constant (log $K_{ex}$) was 6.76. Trace lithium of sub-ppm level in seawater samples could be determined under modified conditions and a detection limit equivalent to 3 times standard deviation for background absorption was 0.42 ng/mL.

• Journal of Microbiology and Biotechnology
• /
• 제14권2호
• /
• pp.284-289
• /
• 2004

A PCR assay for the rapid detection of Vibrio vulnificus strains was developed using a virulence gene for elastase found in various Vibrio species. The DNA sequences in the elastase gene facilitated the identification of a species-specific probe for pathogenic V. vulnificus strains from both clinical and environmental sources. Using an elastase gene-based PCR reaction, a species-specific 507-bp PCR product was visualized by agarose gel electrophoresis. Three different DNA extraction methods were then compared to improve the simplicity and rapidity of detection. A PCR assay using the conventional DNA extraction or boiling method was able to detect as few as 25 V. vulnificus cells, making the detection limits at least 1-log-scale lower than that for the EDT A-treated DNA extraction method. In particular, the boiling method, which does not require purification of the chromosomal DNA, was very effective in terms of simple and rapid detection. Meanwhile, the detection limit in a mixed bacterial culture that included other bacteria, such as Escherichia coli or Bacillus subtilis, was two V. vulnificus cells, which was 1-log-scale lower than that for the control. Accordingly, when coupled with a new DNA extraction method, the elastase gene-based PCR can provide a rapid, specific, and sensitive method for identifying V. vulnificus in clinical and environmental samples.

• 한국음향학회지
• /
• 제39권3호
• /
• pp.143-149
• /
• 2020

본 논문에서는 딥러닝(deep learning)을 이용하여 환경음 분류 시 전처리 단계에서 사용하는 특징 추출 방법이 콘볼루션 신경망의 분류 성능에 미치는 영향에 대해서 다루었다. 이를 위해 환경음 분류 연구에서 많이 사용되는 UrbanSound8K 데이터셋에서 멜 스펙트로그램(mel spectrogram), 로그 멜 스펙트로그램(log mel spectrogram), Mel Frequency Cepstral Coefficient(MFCC), 그리고 delta MFCC를 추출하고 각각을 3가지 분포로 스케일링하였다. 이 데이터를 이용하여 4 종의 콘볼루션 신경망과 이미지넷에서 좋은 성능을 보였던 VGG16과 MobileNetV2 신경망을 학습시킨 다음 오디오 특징과 스케일링 방법에 따른 인식률을 구하였다. 그 결과 인식률은 스케일링하지 않은 로그 멜 스펙트럼을 사용했을 때 가장 우수한 것으로 나타났다. 도출된 결과를 모든 오디오 인식 문제로 일반화하기는 힘들지만, Urbansound8K의 환경음이 포함된 오디오를 분류할 때는 유용하게 적용될 수 있을 것이다.

• 한국CDE학회논문집
• /
• 제17권2호
• /
• pp.97-110
• /
• 2012

High performance sensors and modern data logging technology with real-time telemetry facilitate system fault diagnosis in a very precise manner. Fault detection, isolation and identification in fault diagnosis systems are typical steps to analyze the root cause of failures. This systematic failure analysis provides not only useful clues to rectify the abnormal behaviors of a system, but also key information to redesign the current system for retrofit. The main barriers to effective failure analysis are: (i) the gathered data (event) logs are too large in general, and further (ii) they usually contain noise and redundant data that make precise analysis difficult. This paper therefore applies suitable pre-processing techniques to data reduction and feature extraction, and then converts the reduced data log into a new format of event sequence information. Finally the event sequence information is decoded to investigate the correlation between specific event patterns and various system faults. The efficiency of the developed pre-filtering procedure is examined with a terminal box data log of a marine diesel engine.