• 한국대기환경학회지
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• 제22권4호
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• pp.421-430
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• 2006

This paper explores a new methodology of socio-statistical survey to classify environmental perception characteristics and to quantify atmospheric environmental sensitivity of neighboring people around a large industrial complex. In order to compensate intrinsic inclination against environmental problems, Atmospheric Environmental Sensitivity Index (AESI) is proposed as the weighted-summation of four representative questions asking the current status of the local air quality, which are chosen by the factor analysis of questionnaire. Atmospheric environmental perception is tried to be classified into interest/indifference characteristics and rational/emotional perception on environmental issues, positive/negative opinion on the solution of environmental problems. According to the chi-square cross-correlation and two-way layout analyses, it was clearly shown that environmental perception is categorized into two major groups, i.e., the positive-rational group having lower AESI and the negative-emotional group having higher AESI which means more seriously senses the status of local air quality.

• The Plant Pathology Journal
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• 제31권2호
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• pp.115-122
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• 2015

Anthracnose, caused by Colletotrichum gloeosporioides (C. gloeosporioides; Teleomorph: Glomerella cingulata), is the most destructive disease that affects sweet persimmon production worldwide. However, the biology, ecology, and genetic variations of C. gloeosporioides remain largely unknown. Therefore, in this study, the development of fungicide resistance and genetic diversity among an anthracnose pathogen population with different geographical origins and the exposure of this population to different cultivation strategies were investigated. A total of 150 pathogen isolates were tested in fungicide sensitivity assays. Five of the tested fungicides suppressed mycelial pathogen growth effectively. However, there were significant differences in the sensitivities exhibited by the pathogen isolates examined. Interestingly, the isolates obtained from practical management orchards versus organic cultivation orchards showed no differences in sensitivity to the same fungicide. PCR-restriction fragment length polymorphism (RFLP) analyses were performed to detect internal transcribed spacer regions and the ${\beta}$-tubulin and glutamine synthetase genes of the pathogens examined. Both the glutamine synthetase and ${\beta}$-tubulin genes contained a complex set of polymorphisms. Based on these results, the pathogens isolated from organic cultivation orchards were found to have more diversity than the isolates obtained from the practical management orchards.

• 대한기계학회논문집
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• 제17권1호
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• pp.11-20
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• 1993

본 연구에서는 준 해석적 방법에 촛점을 맞추어 전개를 하려 한다. 대개의 최적설계방식이 그렇듯 준 해석적 방법도 치수변수에 관해 응용이 이루어졌는데 그 정 확도에 문제가 나타나지는 않는다. 그러나 최근 형상변수에 대해 응용을 할 경우 오 차가 큰 것이 발견되었다. 물론 치수변수에 관해서도 준 해석적 방법에서 오차가 존 재한다는 보고 있으나 그 절대량이 크지 않으므로 그다지 심각하지 않다고 사료된다. 여기서는 준해석적 방법의 오차의 과정이 수학적으로 전개될 것이며, 설정된 구조물에 대한 수치적 계산결과가 논의 될 것이다. 해석의 대상 구조물로는 엄밀해가 존재하 여 비교분석이 용이한 2차원 외팔보가 선택되었으며, 여러가지 방법과의 비교로서 준 해석적 방법이 논의되고 효과적인 방법선택이 제안될 것이다.

• Nuclear Engineering and Technology
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• 제54권3호
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• pp.790-802
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• 2022

Large-scale reactor simulation often requires the use of Monte Carlo calculation techniques to estimate important reactor parameters. One drawback of these Monte Carlo calculation techniques is they inevitably result in some uncertainty in calculated quantities. The present study includes parametric uncertainty quantification (UQ) and sensitivity analysis (SA) on the Advanced Test Reactor Critical (ATRC) facility housed at Idaho National Laboratory (INL) and addresses some complications due to Monte Carlo uncertainty when performing these analyses. This approach for UQ/SA includes consideration of Monte Carlo code uncertainty in computed sensitivities, consideration of uncertainty from directly measured parameters and a comparison of results obtained from brute-force Monte Carlo UQ versus UQ obtained from a surrogate model. These methodologies are applied to the uncertainty and sensitivity of k_eff for two sets of uncertain parameters involving fuel plate geometry and fuel plate composition. Results indicate that the less computationally-expensive method for uncertainty quantification involving a linear surrogate model provides accurate estimations for k_eff uncertainty and the Monte Carlo uncertainty in calculated k_eff values can have a large effect on computed linear model parameters for parameters with low influence on k_eff.

• 방사성폐기물학회지
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• 제21권3호
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• pp.359-370
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• 2023

The thermal integrity of spent nuclear fuels has to be maintained during their long-term dry storage. The detailed temperature distributions of spent fuel assemblies are essential for evaluating the integrity of their dry storage systems. In this study, a subchannel analysis model was developed for a canister of a single fuel assembly using the COBRA-SFS code. The thermal parameters affecting the peak cladding temperature (PCT) of the spent fuel assembly were identified, and sensitivity analyses were performed based on these parameters. The subchannel analysis results indicated the presence of a recirculation flow, based on natural convection, between the fuel assembly and downcomer region. The sensitivity analysis of the thermal parameters indicated that the PCT was affected by the emissivity of the fuel cladding and basket, convective heat transfer coefficient, and thermal conductivity of the fluid. However, the effects of the wall friction factor of the canister, form loss coefficient of the grid spacers, and thermal conductivities of the solid materials, on the PCT were predominantly ignored.

• 한국방재학회 논문집
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• 제10권4호
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• pp.9-16
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• 2010

구조물 상시모니터링에서 센서위치 최적화는 모니터링 결과에 중요한 영향을 준다. 따라서 본 논문은 구조계수 또는 손상도를 추정하기 위한 목적으로 동특성 자료를 계측하고자 할 때, 충분한 정보를 획득할 수 있는 최적의 계측점을 선정하는 방법을 제안하였다. 제안된 방법은 유전자 알고리즘을 계측점 선정을 위한 최적화 기법으로 사용하는 것이다. 유전자 알고리즘의 핵심인 적합도함수를 구조계수에 의한 모드벡터의 민감도와 모드벡터의 직교성을 고려할 수 있도록 구성하였다. 간단한 타워 구조물에 대한 예제 해석을 통해 제안된 방법의 타당성을 확인하였다. 적합도함수를 구성하고 있는 모드 민감도와 모드 직교성이 최적 계측점 선정에 어떤 영향을 주는지 예제해석을 통하여 분석하였다. 결론적으로, 제안된 적합도 함수를 사용하면 계측 목적에 타당한 계측점을 선정할 수 있음을 확인하였다.

• Journal of Nutrition and Health
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• 제39권4호
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• pp.323-330
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• 2006

Peripheral insulin resistance in obese/type II diabetes animals results from an impairment of insulin-stimulated glucose uptake into skeletal muscle. Insulin stimulate the translocation of GLUT4 from intracellular location to the plasma membrane. Soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) is implicated in mediation of fusion of GLUT4-containing vesicle with the plasma membrane. Present study investigated regulatory effects of Rhodiola sachalinensis administration and exercise training on the expression of GLUT4 protein and SNAREs protein in skeletal muscles of obese Zucker rats. Experimental animals were randomly assigned into one of five groups ; lean control(LN), obese control(OB), exercise-treated(EXE), Rhodiola sachalinensis-treated(Rho), combine of Rho & EXE (Rho-EXE). All animals of exercise training (EXE, Rho-EXE) performed treadmill running for 8 weeks, and animals of Rho groups (Rho, Rho-EXE) were dosed daily by gastric gavage during the same period. After experiment, blood were taken for analyses of glucose, insulin, and lipids levels. Mitochondrial oxidative enzyme (citrate synthase, CS ; $\beta$-hydroxyacyl-CoA dehydrogenase, $\beta$-HAD) activity were analysed. Skeletal muscles were dissected out for analyses of proteins (GLUT4, VAMP2, syntaxin4, SNAP23). Results are as follows. Exercise and/or Rhodiola sachalinensis administration significantly reduced body weight and improved blood lipids (TG, FFA), and increased insulin sensitivity. Endurance exercise significantly increased the activity of mitochondrial enzymes and the expression of GLUT4 protein, however, administration of Rhodiola sachalinensis did not affect them. The effect of exercise and/or Rhodiola sachalinensis administration on the expression of SNARE proteins was unclear. Our study suggested that improvement insulin sensitivity by exercise and/or Rhodiola sachalinensis administration in obese Zucker rats is independent of expression of SNARE proteins.

• 대한기계학회논문집A
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• 제36권8호
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• pp.873-879
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• 2012

메타모델은 설계 프레임워크 안에서 높은 효율성과 우수한 예측 능력, 타 프로그램과 쉬운 연동성 때문에 공학분야에서 지난 10 년간 최적설계 기법들과 함께 발전해왔다. 메타모델을 구성하기 위해서는 실험계획법, 메타모델링 기법, 검증법과 같은 절차가 요구된다. 검증법은 메타모델의 정확성을 판단하기 때문에 순차적 크리깅 메타모델에서 정확한 크리깅 메타모델을 구성하기 위한 표본점의 개수를 결정한다. 크리깅 메타모델과 같은 보간모델은 표본점에서의 응답을 항상 지나기 때문에 기존 방법으로 메타모델의 정확성을 판단하기 위해서는 추가적인 해석이나 메타모델의 재구성이 요구된다. 본 연구에서는 이러한 추가적인 해석과 메타모델의 재구성을 요구하지 않는 메타모델의 해석적 민감도를 이용하는 민감도 검증법을 제안한다. 14 개의 2 차원 수학예제와 공학예제를 이용하여 이 방법의 타당성을 검증한다.

• 보건행정학회지
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• 제31권2호
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• pp.158-172
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• 2021

Background: Metabolic syndrome has been known as a risk of cardiovascular disease. Meanwhile, high sensitivity C-reactive protein (hs-CRP) is used as a predictor of cardiovascular disease. In this paper, we aimed to investigate the association between hs-CRP and metabolic syndrome. Method: A total of 7,633 were chosen as the study population from the 7th Korea National Health and Nutrition Examination Survey dataset (2016-2017). Our dependent variable was whether an individual had metabolic syndrome or not, and the independent variable of interest was hs-CRP which was categorized into three groups. The chi-square tests and hierarchical logistic regression analyses reflecting survey characteristics were conducted. All analyses were stratified by gender. Results: According to the adjusted model with all covariates, compared to individuals having the low risk of hs-CRP, those having its average risk were more likely to have metabolic syndrome in men (odds ratio [OR], 1.41; 95% confidence interval [CI], 1.12-1.76) and women (OR, 1.69; 95% CI, 1.33-2.16). Individuals having the high risk was not significantly different in men; however, they were more likely to have metabolic syndrome in women (OR, 2.03; 95% CI, 1.28-3.23). Conclusion: In an upcoming aging society, it is important to reduce the risk of metabolic syndrome to improve population health. This study suggests that hs-CRP may be used as a marker of the risk of metabolic syndrome in a gender-specific way, thereby contributing to enhancing awareness of the risk of metabolic syndrome among the general public.

• 한국터널지하공간학회 논문집
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• 제10권1호
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• pp.91-104
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• 2008

터널의 경우 안정성을 정량적으로 평가하기 위해 안전율 개념이 제안된 바 있다. 이는 역학적 해석의 범주에 한정된 것으로 수리 역학적(hyro-mechanical) 연계해석의 범주에서는 해석 모델링의 복잡성으로 인해 안전율 개념이 적용된 연구는 극히 드문 실정이다. 최근 들어 수리-역학적 연계해석에 관한 연구가 활발히 진행되고 있다. 본 연구에서는 해저 터널의 안전율을 정확히 산정하기 위해 수리-역학적 연계해석 시 유도배수 모델링 방법을 비교 분석하였다. 수치해석 시 터널 내부로 유도배수하는 방법으로는 숏크리트 수리특성을 조절하는 유도배수 방법과 집수정을 이용한 유도배수 방법이 고려되었다. 두 방법의 비교를 위해 암반등급, 숏크리트 두께, 암반 수리특성에 대하여 민감도 분석을 수행하였고, 연구 결과 해저터널의 수리-역학적 연계해석 시 집수정을 이용한 유도배수 방법을 사용하는 것이 터널의 안정성을 검토하는 데에 보다 신뢰성이 높은 것으로 나타났다.