• 한국융합학회논문지
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• 제9권3호
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• pp.165-171
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• 2018

본 논문은 국내 인플루엔자 신속항원검사키트의 민감도의 검출한계를 분석하기위하여 국내 시판중인 인플루엔자 신속항원검사키트 5종을 대상으로 인플루엔자 바이러스 A형과 B형 배양액을 연속 희석하여 양성 검출 한계를 분석하였다. 분석 결과 A형의 육안측정결과는 웰스바이오 제품은 1:8192까지, II제품은 1:4096까지, I과 III제품은 1:512까지, IV제품은 1:128에서만 양성이 확인되었고, B형 육안측정결과는 웰스바이오 제품이 1:8192까지, II제품은 1:4096까지, I, III, IV제품의 경우 1:1024까지 양성이 확인되었다. 같은 검체의 기기 판독의 경우 A형, B형 모두 웰스바이오 제품이 1:8192까지, II제품이 1:4096까지, I제품은 1:2048까지 양성으로 확인되었다. 인플루엔자 신속항원검사의 민감도는 환자의 검체 채취부위 및 감염기간, 검체의 양 등에 따라 많은 차이가 있으므로, 검체의 채취시기 및 방법 등을 정확하게 준수해야할 것이며, 신속항원검사 키트의 민감도를 높이기 위한 다각적인 연구가 필요할 것으로 사료된다.

• JSTS:Journal of Semiconductor Technology and Science
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• 제4권4호
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• pp.280-285
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• 2004

In this paper, a 9-bit analog-to-digital converter (ADC) is designed for optical disk drive (ODD) servo applications. In the ADC, the circuit technique to increase the operating range of the sample-and-hold amplifier is proposed, which can process the wide-varying input common-mode range. The algorithmic ADC structure is chosen so that the area can be significantly reduced, which is suitable for SoC integration. The ADC is fabricated in a 0.18-$\mu\textrm{m} $ CMOS 1P5M technology. Measurement results of the ADC show that SNDR is 51.5dB for the sampling rate of 6.5MS/s. The power dissipation is 36.3mW for a single supply voltage of 3.3V.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권2호
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• pp.462-482
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• 2014

This paper proposes a new resampling detection method for images that detects whether an image has been resampled and recovers the corresponding resampling rate. The proposed method uses a given set of zeroing masks for various resampling factors to evaluate the convolution values of the input image with the zeroing masks. Improving upon our previous work, the proposed method detects more resampling factors by checking for some periodicity with an approximate detection mechanism. The experimental results demonstrate that the proposed method is effective and efficient.

• 한국멀티미디어학회논문지
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• 제23권7호
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• pp.883-890
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• 2020

In this paper, we propose a variational expectation-maximization algorithm that computes posterior probabilities from Latent Dirichlet Allocation (LDA) model. The algorithm approximates the intractable posterior distribution of a document term matrix generated from a corpus made up by 50 papers. It approximates the posterior by searching the local optima using lower bound of the true posterior distribution. Moreover, it maximizes the lower bound of the log-likelihood of the true posterior by minimizing the relative entropy of the prior and the posterior distribution known as KL-Divergence. The experimental results indicate that documents clustered to image classification and segmentation are correlated at 0.79 while those clustered to object detection and image segmentation are highly correlated at 0.96. The proposed variational inference algorithm performs efficiently and faster than Gibbs sampling at a computational time of 0.029s.

• 대한간호학회지
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• 제34권6호
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• pp.954-963
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• 2004

Purpose: This study was designed to identify the variables affecting male adolescents' sexual intercourse through a comprehensive analysis of individual and environmental factors. Method: The subjects of this descriptive survey on causal relations were 462 subjects enrolled in liberal and vocational high schools selected on a convenience sampling basis. The data collected from May-July 2002 was put to logistic regression analysis to build a forecast model. Findings: 1) Individual factors such as school record, experience seeking, non-inhibition and sexual permissiveness, 2) family factors such as parental living arrangement, 3) school factors such as career tract and 4) peer factors such as having a boy/girl friend were identified as significant variables forecasting sexual intercourse. Conclusion and Recommendation: The theoretical model built on the basis of the major findings of this study will hopefully help promote a wholesome youth culture related to sexual intercourse. It is recommended that a program be developed that can help control the variables identified in this study along with a follow-up study to verify the model.

• 한국통신학회논문지
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• 제41권8호
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• pp.911-913
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• 2016

최근 이미지기반 바코드 인식 시스템의 활용도가 커지고 있으나, 촬영된 바코드영역의 유효해상도가 낮은 경우 인식률이 현저하게 저하된다. 본 논문에서는 낮은 유효해상도에서도 인식률을 향상시킬 수 있는 업샘플링을 통한 부화소-레벨 동기화 방법을 제안한다. 표준 ITF-18 포맷에 대한 실험결과 VGA ($640{\times}480$)급, CIF ($320{\times}240$)인 영상에서 기존방식과 비교하여 각각 66%, 100%의 인식률 증가를 확인 하였다.

• 한국조경학회지
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• 제19권2호
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• pp.52-64
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• 1991

The actual vegetation and environmental impact grade of Daekwanrim in Hamyang were investigated and the structure of the plant community was analyzed by the classification of TWINSPAN and three kinds of multivariate ordination (PCA, RA, DCA) techniques.Twenty-eight plots were set up by the clumped sampling method in June of 1990. Carpinus laxiflora and C. tschonoskii communities covered 38% and Quercus species communities covered 39% of the total rea. Environmental impact class 3 and 4 area. Twenty-eight plots were divided into three groups according to the degree of damage by TWINSPAN and ordination techniques. The dominant species in the shrub layer of the heavily damaged site and the light damaged site were Styrax japonica and Sasamorpha purporanscens, so the sucessional trends should be disturbed. As a result of the analysis for the relationship between the stand scores of DCA and the environmental impact class, they had a tendancy to increase from the light damaged to heavily damaged site.

• 한국환경과학회지
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• 제15권2호
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• pp.141-155
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• 2006

This study is aimed at the development of a runoff forecasting model to solve the uncertainties occurring in the process of rainfall-runoff modeling and improve the modeling accuracy of the stream runoff forecasting, The study area is the downstream of Naeseung-chun. Therefore, time-dependent data was obtained from the Wolpo water level gauging station. 11 and 2 out of total 13 flood events were selected for the training and testing set of model. The model performance was improved as the measuring time interval$(T_m)$ was smaller than the sampling time interval$(T_s)$. The Neuro-Fuzzy(NF) and TANK models can give more accurate runoff forecasts up to 4 hours ahead than the Feed Forward Multilayer Neural Network(FFNN) model in standard above the Determination coefficient$(R^2)$ 0.7.

• 복식문화연구
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• 제3권2호
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• pp.425-448
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• 1995

The purpose of this study was to compare fur clothing preferences of Korean and Russian women, and then to provide a beneficial data to Koran fur manufacturers who is working in Korea and advancing into Russia. 346 subjects were gather in Seoul and Moscow through convenience sampling method, and frequency, percentage, mean, x²-test, t-test were conducted for data analysis. The results were as follows: 1. Korean and Russian women's fur clothing buying motives, information sources, important factors on purchasing, purchasing, influences ere generally examined. 2. Russian women's fur clothing possession rate as well as fur clothing purchasing intention in the future were higher than Korean women's. 3. Fur clothing item, material, color, style, length which Korean and Russian women prefer were compared. 4. In case of shilhouette, Russia women showed high preference on swinger shilhouette, relatively Korean women preferred H-line. 5. In case of collar design, Russian women showed high preference on stand collar, relatively Korean women preferred notch collar or shawl collar. 6. In case of sleeve design, Russian women showed high preference on turn back cuffs sleeve, relatively Korean women preferred push-up sleeve.

• 한국환경과학회지
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• 제8권2호
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• pp.197-204
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• 1999

The extent of heavy metal pollution in agricultural in soils near the abandoned mine land site was investigated using their concentrations from the 47 sampling sites in B mine. Samples were prepared using 0.1N HCI - Korean Standard Methods - and then analysed for Cd, Cu, Pb, As and Cr by Inductively Coupled Plasma Spectrometer. In addition, soil and mine tailing samples were sequentially extracted to investigate the chemical speciation of heavy metals in them. The soils in the vicinity of mining area are highly contaminated by heavy metals ranging up to 5.96mg Cd/kg, 253.3mg Cu/kg, 76.7mg Pb/kg, and 15.45 mg As/kg, according to the analysis of Korean Standard Methods. The heavy metal levels by the sequential extraction are much higher than its level by Korean Standard Methods, and little correlated with each other. Based on the results, it is suggested that the As pollution in agricultural soils near the AMLS should be dealt as of prior significance in establishing reclamation strategies for the area.