• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.438-438
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• 2023

최근 전 세계적으로 기후변화가 심해지고 있어 자연재해 또한 늘어나고 있다. 많은 자연재해 중 겨울철 재해인 대설 피해는 2012년부터 2021년까지 10년동안 약 1,200억의 피해액이 발생하였고 많은 재산 피해의 위험이 있어 지속적인 연구가 필요하다. 그 중 충남지역의 피해액은 약 200 억으로 우리나라의 피해액 중 두 번째로 많다. 따라서 본 연구에서는 PSR(Pressure Index, State Index, Response Index)과 DPSIR(Driver force Index, Pressure Index, State Index, Impact Index, Response Index) 방법을 이용하여 충남지역의 대설에 대한 취약성을 분석하여 더 신뢰할 수 있는 대설 위험지역을 제시하였다. PSR 방법은 압력지수, 상태지수, 반응지수로 구분되고, DPSIR 방법은 추진력, 압력, 상태, 영향, 대책 지수로 나뉜다. 각 지표에 해당하는 데이터베이스를 구축하고 엔트로피 방법을 이용하여 가중치를 산정하고 충남지역의 대설 취약성 지수를 산출하였다. 2018년부터 2022년까지 최근 5년 동안의 충남지역의 대설피해를 기준으로 PSR(Pressure Index, State Index, Response Index)과 DPSIR(Driver force Index, Pressure Index, State Index, Impact Index, Response Index) 방법을 이용하여 산출한 지수를 비교한 결과 DPSIR(Driver force Index, Pressure Index, State Index, Impact Index, Response Index) 방법을 이용하여 산출된 취약성 지수가 더 신뢰할 수 있는 결과를 보였다. 본 연구의 결과 대설피해 발생 시 대설 위험지수가 높은 지역을 선제적으로 대비할 수 있고 효율적인 제설대응체계를 구축할 수 있을 것으로 기대된다.

• The Journal of the Korea Contents Association
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• v.14 no.8
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• pp.257-265
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• 2014

The purpose of this study was to examine the relationship of the self-rated peridontal health status of dental patients and the type of their treatment(implant, orthodontic treatment and general treatment) to the quality of life(happiness index), to investigate influential factors for oral health, and ultimately to provide some information on the development of oral health care programs geared toward boosting the happiness index. The subjects in this study were the patients who visited dental hospitals and clinics in Busan and South Gyeongsang Province. As for relationship between the field of treatment and the happiness index, the patients who received orthodontic treatment scored higher in both each itemand all the five items, and the patients who received implant treatment scored lower. Regarding links between self-rated periodontal health status and the happiness index, the patients who had no oral symptoms scored higher in both each item and all the five items, and the respondents whose self-rated health status and self-rated oral health status were both very good scored higher in the happiness index. The preparation of oral health programs that aim to improve the self-rated oral health of patients who visit dental hospitals or clinics is required.

• Journal of Wetlands Research
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• v.8 no.1
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• pp.49-58
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• 2006

Drought is an natural phenomenon which effects greatly on our society. It has various time scale and it is difficult to define the beginning and the end. So we can't aware it quickly and the damage of drought become severe. To cope with these problems, it needs to construct drought monitoring system. And it is required that the definition of drought which is objective and can be applied widely and proper drought index for drought monitoring. Meteorology and hydrology have developed drought index for drought monitoring. There are many attempt to interpret the drought using NDVI(Normalized Difference Vegetation Index) or LST(Land Surface Temperature) in remote sensing. In this study, drought index and precipitation is used to find drought severity of last ten years in South Korea. NDVI and VCI is applied to perceive the state of drought. Finally, the possibility of drought monitoring and evaluating drought depth is estimated by analyzing the correlation between vegetation Index and drought index.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.417-418
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• 2018

미국 국립가뭄경감센터 (National Drought Mitigation Center, NDMC)는 다양한 가뭄지수를 통합하여 미국 전역의 가뭄진행상황을 모니터링하고 가뭄대응정책 수립을 위한 주요 의사결정정보로 활용하고 있다. 대표적으로 1999년에 개발되어 현재까지 운영 중인 미국가뭄모니터 (United States Drought Monitor, USDM)는 미국 전역에 대하여 가뭄단계를 표시한 지도 (U.S. Drought Monitor map)를 매주 생성하여 제공하고 있다 (http://droughtmonitor.unl.edu/). 가뭄지표(drought index)는 가뭄의 현황과 시공간적인 전개 과정을 분석하고 정량적 가뭄심도 평가 및 가뭄대응계획 수립을 위한 도구로써 다양하게 개발되어 활용되고 있다. 가뭄의 정도를 정량화하기 위하여 개발된 다수의 가뭄지수는 대상과 평가방법에 따라 가뭄을 표현하는 특성이 서로 다르다. 하나의 가뭄지수로는 가뭄특성을 온전히 표현하기 어렵기 때문에, 최근에는 단일 가뭄지수에 의존하기 보다는 다수의 가뭄지수를 이용하되, 여러 가뭄지수 간의 특징을 고려하여 각 가뭄지수가 갖는 장단점을 상호 보완하여 사용하기를 권고하고 있다. USDM은 파머가뭄심도지수 (Palmer Drought Severity Index, PDSI), Soil Moisture Model (NOAA Climate Prediction Center, CPC), 미 지리조사국의 하천유량 주간보고 (USGS Weekly Streamflow), 표준강수지수 (Standardized Precipitation Index, SPI) 등의 주요 가뭄판단지표를 선정하고, 가뭄판단의 기준으로써 각 가뭄지수의 가뭄심도 (drought severity) 및 백분위수 (percentiles)로 등급을 구분하였다. 가뭄등급은 '정상 상태 (none)'를 포함하여 '비정상적인 건조 (abnormally dry, D0)'에서 최악의 가뭄상태를 의미하는 '이례적인 가뭄상태 (exceptional, D4)'에 이르는 6 단계로 구분하고, 정상상태를 제외한 5 단계의 통합가뭄단계로 표시한다. 우리나라에서는 기상청, 수자원공사, 농어촌공사에서 기상/수문/농업관련 가뭄지수의 위험지도를 실시간으로 제공하고 있으며, 각 지표별로 상이한 기준으로 가뭄을 판단하고 있다. 각각의 가뭄지표에 대한 가뭄판단기준은 해당 국가의 장기적으로 축적된 자료를 활용하여 가뭄단계 및 가뭄판단기준의 재설정에 대한 연구가 필요하다. 본 연구에서는 SPI, SC-PDSI, 표준강수증발산지수 (Standardized Precipitation Evapotranspiration Index, SPEI), Evaporative Demand Drought Index (EDDI), 유효가뭄지수 (Effectvie Drought Index, EDI)의 다양한 가뭄지수를 활용하여 USDM의 가뭄심도 및 가뭄판단기준을 적용하고자한다.

• Fire Science and Engineering
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• v.23 no.3
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• pp.23-30
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• 2009

For managing fire safety system in building by ubiquitous management system, the index system to express the performance level of fire protection system is demanded. If some component formed fire protection system such as sprinkler water supply system is breakdown, that will fall down the performance of fire protection capacity. Consequently, it will affects the level of fire safety of building management and energy response. Consequently, Building fire protection system could give performance level of fire protection condition and the level of fire safety in building. It will also contribute to the development of wide area fire safety management. This development of index system has been developed as a part of the development project of Ubiquitous building fire management system.

• Journal of dental hygiene science
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• v.13 no.4
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• pp.426-433
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• 2013

The objective of this study was to examine whether there is an association of oral health conditions between mothers and their preschool children in Korea. A sample of 823 preschool children and their mothers were selected for this study from the database of the fourth Korean National Health and Nutrition examination Survey. Preschool children were defined as children aged 4, 5, and 6 years old. The subjects were clinically examined for the presence of caries lesions (dft index) and their mother was checked for the presence of dental caries (DMFT index) and periodontal status (CPI). The socio-demographic characteristics and mother's oral health behaviours were considered covariates in this study. Univariate and multivariate analysis was adapted to assess the association of oral health condition between mothers and their preschool children. In univariate analysis, there were significant differences between preschool children's dft index and their mother's age (p=0.005), dental treatment demand for the past one year (p=0.034), and DMFT index (p=0.016). In multivariate analysis, only mother's DMFT index was significantly associated with their children's dft index after adjusting for covariates. In conclusion, the mother's oral health was partly associated with their preschool children's oral health in Korea.

• Proceedings of the KAIS Fall Conference
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• 2009.05a
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• pp.119-122
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• 2009

본 연구는 뇌졸중으로 인한 편마비 환자 20명을 대상으로 총 8주간 시지각 운동 과제를 적용하여 자세 균형, 보행 양상에 미치는 효과를 검증하고자 시행하였다. 실험군(n=10)과 대조군(n=10) 모두 보존적인 물리치료를 실시하였고 실험군에는 시지각 운동 과제 프로그램을 더하여 실시하였다. 본 연구의 결과는 실험군의 되먹임 측정을 통한 자세 균형 검사에서 편평한 지면 위에서 눈을 뜨고 감은 상태의 안정성 지수는 유의한 감소를 보였으며, pillow 위에서 눈을 뜨고 감은 상태의 안정성 지수도 유의하게 감소하였다. 체중분포지수는 편평한 지면에서 눈을 뜨고, 감은 상태와 pillow 위에서 눈을 뜨고 감은 상태 모두에서 유의하게 감소하였다. 실험군에서 10m 보행 속도는 대조군과 달리 유의하게 증가하였다. 본 연구에서의 시지각적 운동과제 프로그램은 편마비 환자의 신체기능과 관련된 자세균형 및 보행을 증진시키는 효과가 있었고 이에 보다 효과적인 운동방법으로 제시할 수 있다.

• The Korean Journal of Applied Statistics
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• v.23 no.5
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• pp.967-975
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• 2010

Since the least squares estimation is not appropriate when multicollinearity exists among the regressors of the linear regression model, the principal components regression is used to deal with the multicollinearity problem. This article suggests a new procedure for the selection of suitable principal components. The procedure is based on the condition index instead of the eigenvalue. The principal components corresponding to the indices are removed from the model if any condition indices are larger than the upper limit of the cutoff value. On the other hand, the corresponding principal components are included if any condition indices are smaller than the lower limit. The forward inclusion method is employed to select proper principal components if any condition indices are between the upper limit and the lower limit. The limits are obtained from the linear model which is constructed on the basis of the conjoint analysis. The procedure is evaluated by Monte Carlo simulation in terms of the mean square error of estimator. The simulation results indicate that the proposed procedure is superior to the existing methods.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2013.04a
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• pp.93-94
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• 2013

현재 국내에는 소방대상물들의 그 수가 많아, 제도적인 관리 감독하기에 어려워 이를 통합관리 하기 위한 U-지역 소방모니터링 시스템을 제안한다. 본 시스템은 건물화재안전 상태지수, 즉 건물화재 대응능력지수와 소방대 화재대응능력지수의 곱으로 산정되는 값을 이용하여 지역 내 소방대상물들을 모니터링 함으로써 소방대상물들의 관리와 대응이 보다 효율적인 통합관리 체계가 이룰 수 있다.

• Journal of Korea Water Resources Association
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• v.52 no.10
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• pp.729-742
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• 2019

Natural disasters such as floods has been increased in many parts of the world, also Korea is no exception. The biggest part of natural damage in South Korea was caused by the flooding during the rainy season in every summer. The existing flood vulnerability analysis cannot explain the reality because of the repeated changes in topography. Therefore, it is necessary to calculate a new flood vulnerability index in accordance with the changed terrain and socio-economic environment. The priority of the investment for the flood prevention and mitigation has to be determined using the new flood vulnerability index. Total 25 urban districts in Seoul were selected as the study area. Flood vulnerability factors were developed using Pressure-State-Response (PSR) structures. The Pressure Index (PI) includes nine factors such as population density and number of vehicles, and so on. Four factors such as damage of public facilities, etc. for the Status Index (SI) were selected. Finally, seven factors for Response Index (RI) were selected such as the number of evacuation facilities and financial independence, etc. The weights of factors were calculated using AHP method and Fuzzy AHP to implement the uncertainties in the decision making process. As a result, PI and RI were changed, but the ranks in PI and RI were not be changed significantly. However, SI were changed significanlty in terms of the weight method. Flood vulnerability index using Fuzzy AHP shows less vulnerability index in Southern part of Han river. This would be the reason that cost of flood mitigation, number of government workers and Financial self-reliance are high.