• ETRI Journal
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• 제30권5호
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• pp.634-643
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• 2008

One of the ubiquitous technology fields that have received the most attention recently from technology communities worldwide is mobile radio frequency identification (RFID). Mobile handsets loaded with RFID readers enable the identification and retrieval of information on RFID tagged objects. In Korea, a variety of mobile RFID services are currently being piloted, and their commercial roll-out looks imminent. The goal of this study is to propose, ahead of the commercial launch of mobile RFID services, a customer satisfaction index (CSI) model for this service category and to then measure the CSI to derive practical implications for their providers and pointers related to the improvement of service. A web survey was conducted on Korean mobile phone subscribers who had participated in a mobile RFID pilot program. Using the results of this survey, we tested the CSI model and its hypotheses by employing a partial least-squares-based structural equation model analysis and calculated the index. We further conducted an importance-performance analysis in order to provide insights that may be useful for improving the quality of mobile RFID services.

• 한국가스학회지
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• 제1권1호
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• pp.14-20
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• 1997

배관망의 해석은 유체역학을 필요로 하며 관내의 유체의 거동과 운전상태에 따른 유동 해석을 위해 여러 식들이 사용되어왔다. 본 연구에서는 정상상태의 유량방정식을 사용해 경인지역가스 배관망에 대한 수학적 모델을 만들고 모사 및 분석을 수행하였다. 개발된 수학적 모델에서 얻어진 데이터에 통계학적인 방법을 도입해 통계학적 모델을 만듦으로써 통계학적 모델을 이용한 배관망 해석의 가능성에 대해 검토하였다.

• 약학회지
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• 제49권2호
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• pp.115-121
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• 2005

In this study, the performance of a portable NIR system and a FT NIR spectrometer were compared to determine water content of hairless mouse skin. The stratum corneum parts wer e separated from the epidermal tissues by trypsin solution. NIR diffuse reflectance spectra of hairless mouse skin were acquired using a fiber optic probe. In the near infrared, water molecules show two clear absorption bands at 1450 nm from first overtone of O-H stretching and 1940 nm from the combination involving O-H stretching and O-H deformation. It was found that the variations of O-H absorption band according to water content. Partial least squares regression (PLSR) was applied to develop a calibration model. The PLS model showed a good correlation between NIR predicted value and the absolute water content of separated hairless mouse skin, in vitro. For both the portable and the FT NIR spectrometer, These studies showed the possibility of a rapid and nondestructive skin moisture measurement using NIR spectroscopy. The portable NIR spectrometer with a photodiode arrays-microsensor could be more rapidly applied for the determination of water content with comparable accuracy with the performance of a FT spectrometer .

• 한국환경과학회지
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• 제29권5호
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• pp.445-455
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• 2020

Fine dust is one of the most critical environmental issues in Korea, and the government recognizes the need to establish customized reduction policies based on regional characteristics. Several studies on air pollutants investigate whether factories affect the distribution of fine dust in a particular region. However, understanding the impact of the entire industry sector requires further investigation. This study identifies the impacts of industrial characteristics on fine dust levels of 141 municipalities across Korea in 2016. A total of 23 variables were used, of which 12 referred to industries and 11 to general characteristics of each city. Due to the high correlation between independent variables, partial least squares (PLS) regression models were used. The analysis identified 14 significant variables for PM10 and 13 for PM2.5. Therefore, the results suggest that local industrial characteristics can significantly influence fine dust levels and provide suggestions for establishing customized reduction policies based on local characteristics.

• 한국작물학회지
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• 제63권4호
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• pp.360-377
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• 2018

The levels of 12 isoflavones were measured in soybean (Glycine max (L.) Merrill) sprouts of 68 genetic varieties from three countries (China, Japan, and Korea). The isoflavone profile differences were analyzed using data mining methods. A principal component analysis (PCA) revealed that the CSRV021 variety was separated from the others by the first two principal components. This variety appears to be most suited for functional food production due to its high isoflavone levels. Partial least squares discriminant analysis (PLS-DA) and orthogonal projections to latent structures discriminant analysis (OPLS-DA) showed that there are meaningful isoflavone compositional differences in samples that have different countries of origin. Hierarchical clustering analysis (HCA) of these phytochemicals resulted in clusters derived from closely related biochemical pathways. These results indicate the usefulness of metabolite profiling combined with chemometrics as a tool for assessing the quality of foods and identifying metabolic links in biological systems.

• 한국식품과학회지
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• 제47권1호
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• pp.20-26
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• 2015

본 연구에서는 상업용 곶감의 꽃받침과 종자를 이용하여 대사체 수준에서의 원산지와 품종 식별 체계를 확립하였다. 실험에 이용된 곶감 시료는 국내산 곶감 함안수시(Hamansusi), 예천고종시(Yecheongojongsi), 산청단성시(Sancheongdanseongsi), 그리고 논산월하시(Nonsanwalhasi) 4개 품종과 국내에서 판매되고 있는 중국산 곶감 2개 종류의 꽃받침과 종자를 사용하였으며, 꽃받침과 종자 시료의 전세포 추출물로부터 FT-IR 스펙트럼 데이터를 기반으로 다변량 통계분석(PCA, PLS-DA)을 실시하였다. 이 결과 국내산 곶감 4품종과 중국산 곶감 2종류가 두 그룹으로 확연히 나뉘어지는 것을 확인할 수 있었다. 상업용 곶감의 꽃받침을 PLS regression을 실시한 결과 국내산과 중국산 곶감을 100% 예측할 수 있었다. 또한 곶감 종자를 이용하여 품종 식별한 결과 각 4개의 그룹으로 나뉘어지는 것을 확인할 수 있었으며, PLS regression을 실시한 결과 약 86%의 정확도로 품종 식별이 가능함을 알 수 있었다. FT-IR 스펙트럼 분석의 간편성과 신속성을 고려할 때, 본 연구 결과는 상업용 곶감에 대한 원산지나 품종 식별의 신속한 수단으로 활용할 수 있을 것으로 예상된다. 더 나아가 본 기술을 이용하여 다른 농산물의 원산지 또는 품종 식별 수단으로 활용이 가능할 것으로 기대된다.

• Asia pacific journal of information systems
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• 제14권1호
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• pp.101-123
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• 2004

User satisfaction has been widely used by information system(IS) researchers as the most appropriate surrogate variable for the systems success since Bailey and Pearson(1983) provided their user satisfaction measurement. Because user satisfaction is a perceived performance measure by users, not a real or objective measure for systems success, however, perceived user satisfaction by users may not be exactly identical with the real systems performance. In this regard, if the user's ultimately perceived satisfaction is different from the real systems performance, we need to investigate why these two measures are different and which factors may cause the difference. From the perspective of disconfirmation of user expecations, this study examined why user satisfaction and real systems performance may not be identical each other. Expectaion-disconfirmation theory which has had a central role in marketing in explaining the effects of expectation and disconfirmation on consumer satisfaction was similarly adopted in this study to explain the role of expectation and disconfirmation in user satisfaction in the IS environment. Based on the expectation-disconfirmation theory, the current study developed a research model to examine the effects of expectation, system performance, and disconfirmation on user satisfaction in particular. Six research hypotheses derived from the research model were empirically tested using the partial least squares(PLS) method. The results of the statistical analysis indicate that the effects of system performance and disconfirmation were fairly strong on user satisfaction, while the user's expectation has shown insignificant influences on user satisfaction.

• 한국콘텐츠학회논문지
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• 제16권3호
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• pp.553-562
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• 2016

본 연구는 투자자가 부동산 투자의사결정에 있어 고려해야하는 투자선호특성을 규명하고 투자자 유형에 따른 선호특성의 차이를 비교 분석하였다. 투자만족도에 영향을 미치는 요인을 분석하기 위해 선행연구 고찰을 통하여 투자선호특성을 종합하고 PLS(Partial Least Squares)회귀분석을 활용하여 그 영향을 실증하였다. 또한 투자자 유형별 투자선호특성을 비교하기 위해 분석대상을 기관투자자와 일반투자자로 구분하여 설문을 진행하였다. 분석결과 기관투자자는 인플레이션 헤지, 조지자본회수, 재무적 안전성, 레버리지 위험 등의 투자선호특성을 중시하는 것으로 나타났으며 일반투자자의 경우 임대수익, 시설 및 설비, 상권 및 인구, 이용 편의성, 레버리지 위험, 조기자본회수 등의 투자선호특성이 중요한 것으로 도출되었다. 또한 공통적인 투자선호특성으로 레버리지 위험, 조기자본회수, 시설접근성이 도출되었다. 이러한 결과를 바탕으로 시사점을 도출하면 다음과 같다. 첫째, 투자자들은 부동산 투자에 있어 투자 위험을 회피하거나 줄일 수 있는 요인을 중시 한다는 점이다. 둘째, 부동산 경기 침체 및 저금리 현상으로 나타나는 부동산 관련 규제 및 금융규제완화를 중요시하는 것으로 나타났다. 셋째, 부동산 투자의사결정에 있어 투자자 유형에 따른 차이를 고려해야 한다는 것이다.

• 분석과학
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• 제33권2호
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• pp.98-107
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• 2020

Methamphetamine (MA) is currently the most abused illicit drug in Korea. MA is produced by chemical synthesis, and the final target drug that is produced contains small amounts of the precursor chemicals, intermediates, and by-products. To identify and quantify these trace compounds in MA seizures, a practical and feasible approach for conducting chromatographic fingerprinting with a suite of traditional chemometric methods and recently introduced machine learning approaches was examined. This was achieved using gas chromatography (GC) coupled with a flame ionization detector (FID) and mass spectrometry (MS). Following appropriate examination of all the peaks in 71 samples, 166 impurities were selected as the characteristic components. Unsupervised (principal component analysis (PCA), hierarchical cluster analysis (HCA), and K-means clustering) and supervised (partial least squares-discriminant analysis (PLS-DA), orthogonal partial least squares-discriminant analysis (OPLS-DA), support vector machines (SVM), and deep neural network (DNN) with Keras) chemometric techniques were employed for classifying the 71 MA seizures. The results of the PCA, HCA, K-means clustering, PLS-DA, OPLS-DA, SVM, and DNN methods for quality evaluation were in good agreement. However, the tested MA seizures possessed distinct features, such as chirality, cutting agents, and boiling points. The study indicated that the established qualitative and semi-quantitative methods will be practical and useful analytical tools for characterizing trace compounds in illicit MA seizures. Moreover, they will provide a statistical basis for identifying the synthesis route, sources of supply, trafficking routes, and connections between seizures, which will support drug law enforcement agencies in their effort to eliminate organized MA crime.

• 디지털융복합연구
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• 제14권4호
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• pp.209-220
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• 2016

조직은 정보보안정책을 제공하고 이를 준수하기 위한 교육 및 지원 등 지속적인 노력을 하고 있으나, 조직 구성원의 보안 미준수에 따른 사고는 끊이지 않고 있다. 본 연구는 조직 구성원의 정보보안정책 준수행동에 영향을 주는 요인들을 Triandis 모델을 적용하여 규명하였으며, 요인들간의 영향 관계를 구조방정식모델링 기법인 PLS(Partial Least Squares)를 통해 살펴보았다. 가설검증 결과 조직은 정보보안정책과 이를 지원하는 촉진조건을 통해 구성원의 정보보안정책 준수의도 및 행동을 유도할 수 있으며, 조직의 정보보안정책에 대한 구성원의 기대가치, 습관 및 감정이 중요함을 증명하였다. 본 연구는 Triandis 모델을 정보보안 분야에 적용하여 분석하고, 구성원의 정보보안 행동에 대한 방향성을 제시하였다는 점에 의의가 있다. 그리고 본 연구 결과를 통해 조직의 정보보안정책 수립 및 구성원의 준수행동을 높이기 위한 방안을 제공할 수 있을 것이다.