• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.342-342
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• 2006

Atomic force microscope (AFM) enables us to stretch a single polymer chain by picking it at its two modified termini. Using this method called "nanofishing," we have studied statistical properties of single polymer chains. A force-extention curve obtained for a polystyrene with thiol termini in a cyclohexane showed a good agreement with a worm-like chain (WLC) model, and thus gave microscopic information about entropic elasticity. In this report, the experiments were performed at wide-range temperatures, resulting in wide-range solvent qualities from poor to good solvent condition. The temperature dependence of statistical properties of polystyrene was examined. The coil-strand transformation realized in a poor solvent was also discussed.

• Communications for Statistical Applications and Methods
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• 제19권6호
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• pp.799-808
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• 2012

It is known that human disease and the economic traits of livestock are significantly affected by a gene combination effect rather than a single gene effect. Existing methods to study this gene combination effect have disadvantages such as heavy computing, cost and time; therefore, to overcome those drawbacks, the SNPHarvester was developed to find the main gene combinations. In this paper, we looked for gene combinations using an adjusted linear regression model. This research finds that superior gene combinations which are related to the quality of the Korean beef cattle among sets of SNPs using SNPHarvester. We also identify the superior genotypes using a decision tree that can enhance the various qualities of Korean beef among selected a SNP combination.

• Journal of Information Processing Systems
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• 제4권1호
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• pp.27-32
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• 2008

Minimum support and confidence have been used as criteria for generating association rules in all association rule mining algorithms. These criteria have their natural appeals, such as simplicity; few researchers have suspected the quality of generated rules. In this paper, we examine the rules from a more rigorous point of view by conducting statistical tests. Specifically, we use contingency tables and chi-square test to analyze the data. Experimental results show that one third of the association rules derived based on the support and confidence criteria are not significant, that is, the antecedent and consequent of the rules are not correlated. It indicates that minimum support and minimum confidence do not provide adequate discovery of meaningful associations. The chi-square test can be considered as an enhancement or an alternative solution.

• 한국물환경학회지
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• 제27권4호
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• pp.499-508
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• 2011

We analyzed the variations of water quality with flow regime alterations to determine the characteristics of the stream where the stream management is considerably difficult due to the high variability of the flow rates. In this study, both flow rates and water qualities were monitored at the tributaries, 34 in count, of both Geum River and Sabgyo Lake Basins. The variation of water qualities were divided into 2 types, based on their stream flow rates, known as Type I and Type II. If the water quality of a stream increases during low flow rate periods compared with high flow rate periods, it is classified as Type I; if the water quality of the stream increases during high flow rate periods compared with low flow rate periods, it falls under Type II. The analysis for the variations of water qualities, of all 43 basins, resulted to 24 basins under Type I and Nineteen 19 basins under Type II. The variations of water qualities were analyzed first by using Regression Analysis followed by Statistical Analysis. The average slope of the variations of water qualities and the slope of the standard deviations were 0.00135 and 0.00477, respectively. The Probability Distributions of both Type I and Type II basins were 61.1% and 38.9%, respectively. The basin having a probability distribution of 61.1% and is also known as Type I, increases during periods of low flow rates, due to the presence of point sources. Therefore, the basin should be enforced with stream management. Before the stream management can be implemented in all streams falling under Type II, the sources of contaminants should first be estimated. These contaminants can be classified into two parts, the first is Point source pollution and the second is Non-point source pollution, where the Non-Point source pollution can be sub-divided into two types, with storm runoff and without storm runoff.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.45-46
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• 2003

A process control system has been developed for measurement and characterization of the nanofiber web qualities. The nano-fiber information system (NAFIS) developed consists of a measurement device and an analysis algorithm, which are a microscope-laser sensor fusion system and a process information system, respectively. It has been found that NAFIS is so successful in detecting irregularities of pore and diameter that the resulting product has been quitely under control even at the high production rate. Pore distribution, fiber diameter and mass uniformity have been readily measured and analyzed by integrating the non-contact measurement technology and the random function-based time domain signal/image processing algorithm. Qualifies of the nano-fiber webs have been revealed in a way that the statistical parameters for the characteristics above are calculated and stored in a certain interval along with the time-specific information. Quality matrix, scale of homogeneity is easily obtained through the easy-to-use GUI information. Finally, ANFIS has been evaluated both for the real-time measurement and analysis, and for the process monitoring.

• 한국식품과학회지
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• 제22권2호
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• pp.199-205
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• 1990

우리나라 쌀의 품종별 도정 및 품위특성을 조사하여 합리적인 시장성을 평가할 수 있는 방법을 모색하고자 일반계 쌀과 다수계 쌀의 품종별로 품위 및 도정특성을 조사 분석한 결과는 다음과 같다. 유형별 도정률은 일반계가 높고 쇄미율은 통일계가 높았으나 미강률은 큰 차이가 없었으며 벼에서 쌀까지의 도정률은 현미의 용적중, 제현율 및 현백률이 높은 품종이 요구되고 현미의 쇄립률, 심복백립률, 왕겨율, 쇄미율 및 미강률이 낮은 품종은 쌀의 품위 및 수율이 향상되었다.

• 한국물환경학회지
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• 제20권1호
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• pp.63-71
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• 2004

The long-tenn trend analyses of water qualities were performed for 49 monitoring stations located in Nakdong River. Water quality parameters used in this study are the monthly data of BOD(Biological Oxygen Demand), TN(Total Nitrogen) and TP(Total Phosphorus) measured from 1990 to 1999. The long-tenn trends were analyzed by Seasonal Mann-Kendall Test and Locally WEighted Scatter plot Smoother(LOWESS). Nakdong river was divided into four subbasins, including upstream watershed, midstream watershed, western downstream watershed and eastern downstream watershed. The results of Seasonal Mann-Kendall Test indicated that there would be no trends of BOD in upstream watershed, western and eastern downstream watershed. Trends of BOD were downward in midstream watershed. For TN and TP, there were upward trends in all of watersheds. But LOWESS curves suggested that BOD, TN and TP concentrations generally increased between 1990 and 1996, then resumed decreasing.

• 한국전기전자재료학회논문지
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• 제20권7호
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• pp.636-644
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• 2007

36,000lbs porcelain insulators of D-1995, D-1997 and D-2002 investigated mechanical and electrical qualities, where is process of using in the Korea 154 kV transmission lines. It analyzes the cause of the elapse of a year aging of the transmission insulators. Weibull distribution function, product quality and uniform quality, etc. investigated for prediction to extant life of insulator. It calculate change as statistical elapse of a year through product qualities of used insulator and new insulator, uniform equality and uniformity of insulator. In case of D-1995 year used insulator, it decided to badness decline index k by 0.0237, badness quality index by 1.0 and 3.0. Result of extant confidence life Ym was calculated that remain each 4 yens and 0.7 yens that uniformity index is considered. Extant life of D-1997 and D-2002 insulators Predicted by about 40 years.

• 한국식품과학회지
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• 제17권5호
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• pp.355-360
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• 1985

콩기름, 경화콩기름 및 옥수수기름을 형광하에서 산화시켜. 향미품질을 관능검사및 가스크로마토 그라피(GC)로 분석하였다. 관능검사의 경우, 10점 Hedonic scale을 사용하여 8개의 각기 다른 연구소에서 시행하였는데, 총 평가원의 수는 95명이었다. 관능검사에 의한 기름의 향미 품질값과 GC에 의한 계산된 향미품질 값 사이치 상관계수는 0.10$\sim$0.99사이에 나타났으나. 대부분의 경우 상관계수 0.9이상의 높은 상관관계를 보였다. 총평가원의 관능검사에 의한 향미품질값과 GC에 의한 향미품질값의 상관계수는 콩기름 0.96, 경화콩기름 0.97 및 옥수수기름 0.97이었다 가스크로마토그래피에 의한 향미품질값의 계산은 2.4-decadienal 이성체의 합계를 근거로 하였다. 이 상관관계 연구는, 식용유의 향미성분에 의한 품질검사가 GC분석, 관능검사및 통계처리가 적합할 경우, 실제 공정에 필요한, 유용한 방법으로 쓰일 수 있음을 시사하였다.

• Communications for Statistical Applications and Methods
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• 제16권6호
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• pp.915-923
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• 2009

광범위 유전자 연관(genome-wide association) 연구에서는 무수히 많은 유전자들 중에 인간의 질병에 관련된 유전자를 찾아왔다. 기존의 인간 질병에 관련된 유전자를 찾는 방법에서 이렇게 많은 유전자들 중에서 우수한 유전자를 찾는데 직접 이용할 시에는 계산이 복잡해지고 비용이 많이 들어가며 시간이 오래 걸린다는 단점이 생긴다. 따라서 이번 수많은 유전자들 중 주요 유전자 그룹을 찾는 방법으로 SNPHarvester가 개발되였다. 본 연구에서는 인간의 질병이 아닌 한우의 여러 경제형질에 관련된 우수 유전자를 SNPHarvester를 이용하여 17 개의 SNP들 중에서 우수한 유전자 그룹을 찾았고 의사결정나무(decision tree)를 이용하여 한우의 여러 경제형질을 높일 수 있는 SNP 그룹 내의 우수 유전자형도 함께 규명할 수 있었다.