• 환경영향평가
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• 제14권4호
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• pp.157-164
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• 2005

Existing models that predict of Daily water supply include statistical models and neural network model. The neural network model was more effective than the statistical models. Only neural network model, which predict of Daily water supply, is focused on estimation of the operational control. Neural network model takes long learning time and gets into local minimum. This study proposes Neuro Genetic hybrid model which a combination of genetic algorithm and neural network. Hybrid model makes up for neural network's shortcomings. In this study, the amount of supply, the mean temperature and the population of the area supplied with water are use for neural network's learning patterns for prediction. RMSE(Root Mean Square Error) is used for a MOE(Measure Of Effectiveness). The comparison of the two models showed that the predicting capability of Hybrid model is more effective than that of neural network model. The proposed hybrid model is able to predict of Daily water, thus it can apply real time estimation of operational control of water works and water drain pipes. Proposed models include accidental cases such as a suspension of water supply. The maximum error rate between the estimation of the model and the actual measurement was 11.81% and the average error was lower than 1.76%. The model is expected to be a real-time estimation of the operational control of water works and water/drain pipes.

• 대한물리치료과학회지
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• 제18권2호
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• pp.73-80
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• 2011

Purpose: The purpose of this study was to investigate the correlation between the visual perception ability and the static dynamic balance ability in health elderly. Method: The Motor Free Visual Perception Test-Row Score(MVPT-RS) and MVPT-Process Time(MVPT-PT) were used for evaluating the visual perception abilities. Assessment of the balance ability was taken by using Good Balance System. In the assessment using Good Balance System, X, Y coordinate speed, anterior-posterior direction, medial-lateral direction and Velocity Movement(VM) in standing posture when eye open were measured as static balance abilities. Thirty-seven healthy elderly who live in Gwangyang participated in the experiment for 2 months, from October to November 2010. Results: 1. There were statistically significant differences of MVPT-RS, MVPT-PT, NSB-X, NSB-Y, NSB-VM, OLB-X, and OLB-VM based on the gender(p<0.05). 2. The negative correlations of MVPT-RS:NSB-Y(r=-0.354), MVPT-RS:OLB-X(r=-0.4), MVPT-RS: OLB-Y(r=-0.371), but positive correlations of MVPT-PT:DTB-T showed a statistical significance(r=0.45, p<0.05). 3. The positive correlations of NSB-X:NSB-Y(r=0.54), NSB-X: NSB-VM(r=0.848), NSB-Y:NSB-VM(r=0.531), OLB-X:OLB-Y(r=0.876), OLB-X:OLB-VM(r=0.872), and OLB-Y:OLB-VM(r=0.787) showed statistical significances(p<0.05). Conclusion: These results showed that the visual perception ability was correlated with some balance ability in health elderly. Especially the perception test process time(MVPT-PT) has closely related with the DTB-T. The visual perception ability is considered as a factor on the balance ability in health elderly. Further study will focus on the development of improving program of visual perception ability as an improving method of balancing ability in health elderly.

• 환경영향평가
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• 제7권1호
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• pp.11-22
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• 1998

In Korea, the Demilitarized Zone(Hereafter DMZ) and the vicinity have special importance for a natural ecosystem research. However, We have difficulty in studying this region due to the access control. The purpose of this study is to analyze the landcover and the vegetation status of DMZ and the vicinity using remote sensing and GIS techniques. The site was divided into two regions; less than 2km from DMZ and less than 10 km from DMZ. The analyzed results of this study are as follow. First, the result of vegetation analysis is that the region of South and North Korea are similar in the area less than 2km from DMZ. However, the region of South Korea have good vegetation status than the region of South Korea in the area less than 10km from DMZ. Second, the result of landcover analysis is that the ratio of the landcover of South and North Korea decreased forest, agricultural and grass, built-up, barren area by turns in the area less than 2km from DMZ. However, the built-up area of South Korea increased as much as the forest area decreased and the other areas of North Korea increased as much as the forest area decreased in the area less than 10 km from DMZ. There are some differences in landcover between analyzed result and an existing statistical data. The causes are using one season setellite images, and an existing statistical data with landuse types. The analysis using remote sensing and GIS techniques is the most suitable method to understand the landcover and vegetation status of DMZ and the vicinity. Further studies are expected to overcome the limitation of this study.

• 방송공학회논문지
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• 제21권3호
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• pp.380-390
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• 2016

화질 평가 방법은 그동안 많은 방법이 소개되어 왔다. 특히 우수한 성능을 보여주는 무참조 평가에서 기법에서 발전이 지속되어 왔다. 본 논문에서는 쉬어렛 영역에서 자연영상의 통계적 특성에 기반한 무참조 영상화질 평가 방법을 제안한다. 제안 방법은 쉬어릿 계수의 통계 특성으로부터 왜곡에 민감한 특징을 추출한다. 쉬어렛 변환의 복소수 계수로부터 위상과 크기 특징을 얻어낸다. 또한 쉬어렛 변환은 다양한 스케일로 영상을 분석할 수 있기 때문에, 스케일간의 계수의 의존성에 대한 왜곡의 영향을 분석한다. 화질 예측을 위해서 특징들은 SVM(support vector machine)을 이용하여 영상 왜곡 분류 및 화질 예측에 활용된다. 실험결과는 제안 방법이 주관적 평가와의 높은 상관도를 보여주고, 또한 기존 참조 및 무참조 방법보다 우수한 성능을 보여준다.

• 비파괴검사학회지
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• 제20권3호
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• pp.200-205
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• 2000

제 1보에서 Windows 환경 하에서 PSI/ISI 데이터의 효율적 관리 및 다원적평가와 분석이 가능한 고리 원전 PSI/ISI 데이터베이스 구축과 프로그램 개발(IDPIN)에 대해 소개하였다. 제 2보에서는 월성 원자력발전소 PSI/ISI 자료 관리를 위한 지능형 데이터베이스 프로그램(WS-IDPIN)을 개발하였다. 이 프로그램에는 월성 원전 PSI/ISI 관련 자료 분석 기능, PSI/ISI UT 검사 보고서 양식의 표준화와 전산 시스템화, PSI/ISI 비파괴검사 결과의 통계적 신뢰도 평가 프로그램(depth and length sizing performance 등) 등을 개발하여 원전 PSI/ISI 데이터 관리 전문가시스템(expert system)화에 한 단계 접근하였다.

• 응용통계연구
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• 제21권2호
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• pp.183-200
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• 2008

국민연금의 효율적인 운영을 위하여 고령화, 저출산과 같은 사회현상에 대비한 연금 관리를 위한 연구가 요구되고 있다. 본 연구는 유족연금의 발생을 예측하고 유족연금의 발생가능성 정도에 따라 대상자들을 분류하기 위한 통계적 모델을 제안하기 위하여 두 단계의 로지스틱 분석을 실시하였다. 첫 단계의 분석으로부터, 전체 대상자에 대하여 유족연금의 발생에 영향을 주는 주요인의 특성과 국민연금의 종류를 파악하고 이를 대상으로 유족연금의 발생에 대한 로지스틱 회귀모형을 적용하되 대상자를 합리적으로 등급화하기 위한 모델을 제안하고 이를 일반적인 로지스틱모델과 비교하였다. 정확도, 민감도, 특이도와 사후 확률의 분포를 비교하고 K-S통계량을 통하여 등급의 타당성 평가와 리프트 그래프를 통한 모델의 예측력평가를 함으로써 합리적 등급분류를 통한 대상자관리가 가능한 통계적 모델임을 보였다. 예측된 통계적 모델을 적용하여 유족연금 수급유무와 등급별 분류, 등급에 따른 유족연금액 예측을 통하여 효율적인 연금관리 방안을 제안할 수 있다.

• 대한한의학회지
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• 제31권6호
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• pp.40-46
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• 2010

Objective: This study investigated the therapeutic possibility of natural therapy in atopy-camp for children with atopic dermatitis. Methods: 30 children (19 boys and 11 girls, median age 11.5 years, ranging from 9 to 15) participated in natural environment-based activities in a camp-village located in Geumsan-gun for five days. Assessment of symptom change was conducted by self-reporting numeric scale (NRS) for pruritus and sleeping difficulty, investigator global assessment (IGA), eczema area and severity index (EASI score), serum histamine and IgE concentration before and after the camp period. Statistical significance was analyzed by paired t-test. Results: NRS for pruritus ($4.7{\pm}2.0$ into $4.3{\pm}2.1$), sleeping difficulty ($3.1{\pm}2.1$ into $2.9{\pm}2.0$), and serum histamine concentration ($4.27{\pm}7.39$ mol / L into $3.21{\pm}6.08$ mol / L) showed positive changes but didn't reach statistical significance (p > 0.05). IGA ($3.8{\pm}0.9$ into $4.13{\pm}1.0$), while EASI score ($10.8{\pm}9.7$ into $9.1{\pm}9.2$) and IgE ($408{\pm}320$ IU / mL into $385{\pm}3.8$ IU / mL) were significantly improved (p < 0.01). Conclusions: In spite of the limitation of the clinical trial protocol, this study may provide the possibility of natural environment-based therapy for children with atopic dermatitis.

• 한국농공학회논문집
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• 제60권6호
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• pp.33-42
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• 2018

This study evaluated the vulnerability of irrigation water supplied to the crops. The target areas were selected as Dangjin-si, Yesan-gun, and Cheongyang-gun. The survey items of the climate exposure were annual precipitation and rainless days. The sensitivity survey items were cultivation area, groundwater level, evapotranspiration and groundwater consumption. The survey items of the adaptability were Number of groundwater well and Water supply ratio. The survey methods for these items were investigated in a variety of ways, including "National Climate Data Service System", "Korean Statistical Information Service", "National ground water monitoring network in korea annual report" and "Chungcheongnam-do Statistical Yearbook", "HOMWRS". Vulnerability assessment results were rated within the range of 0~100 points. The first grade was rated 0-25, the second grade 26-50, the third grade 51-75, and the fourth grade 76-100. And the lower the score, the lower the vulnerability. As a result, Cheongyang-gun showed a high vulnerability of over 50 points, Dangjin-si showed a low vulnerability rating of 31.20 points and a Yesan-gun of 36.00 points.

• 한국지리정보학회지
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• 제23권2호
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• pp.36-52
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• 2020

본 연구에서는 낙동강을 대상으로 EFDC 모형을 구축하고, 2차원 수리해석을 수행하였다. 홍수기와 평수기에 대한 모의를 위해 실측수위, 보 방류량, 지류유입량을 포함하는 실측자료를 이용하였으며, 계산 결과를 관측소에서의 실측수위와 비교함으로서 적용 모형의 정확성과 적합성을 검증하였다. 또한, 계산결과에 대한 PBIAS, RSR, RMSE를 산정하여 모형의 통계적 정량적인 평가도 수행하였다. 모형의 검증 후 보의 일정 방류 시나리오 유량조건을 적용하여 각 보 구간별 평균유속을 산정하였으며, 산정된 평균유속은 유량조사사업단에서 조사한 평균유속과의 비교 및 검증을 실시하였다. 그리고 현장에서 실무적으로 적용 가능한 간편 도달시간 산정방법을 제안하고 그 방법을 적용하여 도달시간을 산정하였으며, 제안 방법은 홍수 예경보 등 현장의 실무에서 실제 적용이 가능할 것으로 기대된다.

• 한국환경과학회지
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• 제16권12호
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• pp.1451-1462
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• 2007

Heavy metal concentrations in the soil were investigated for the abandoned Samkwang metal mine, Cheongyang-Gun, Chungnam Province, Korea. The concentrations of heavy metal(As, Cd, Cu, Ni, Pb, Zn) were determined in mine soils collected at the abandoned mine sites to obtain a general classification and specification of the pollution in this highly polluted region. The results estimated with the normal test and basis statistic on the central tendency and variation showed that the distribution of heavy metal concentration had significantly different at the range of all locations. The range of spatial distribution on the relationship of heavy metal concentration and pH was $4.8{\sim}8.8$ and heavy metal concentration on the type of land use was highest in forest land, and also Ni and Zn in farm and rice field showed the high concentration. The distribution of heavy metal concentration on the depth of a soil showed that the metal concentrations in subsoil were higher than of those in surface soil, while the concentration of Cu and Ni had no significant difference on the depth of soil. Results from the correlation analysis using the data except the extreme and unusual data revel that Zn-Cd(r=0.867), Zn-As(r=0.797), Zn-Pb(r=0.764), Cu-Cd(r=0.673), Cu-As(r=0.614) and Zn-Ni(r=0.605) were the most important parameters in assessing variations of heavy metal in soil. To discriminate pattern differences and similarities among samples, principal factor analysis(PFA) and cluster analysis(CF) were performed using a correlation matrix. This study suggests that PFA and CF techniques are useful tools for identification of important heavy metal and parameters. This study presents the necessity and usefulness of multivariate statistical assessment of complex databases in order to get better information about the quality of soil and gives the basis information to clean up the abandoned mine sites.