• Journal of the Korean Data and Information Science Society
• /
• v.28 no.1
• /
• pp.195-206
• /
• 2017

The purpose of this study was to identify factors affecting quality of health care. Methods: The data were derived from the 2011-2013 Korea health panel survey (beta version 1.0). The data were analyzed using SPSS 21.0 with descriptive statistics, ${\chi}^2$-test, and multiple logistic regression analysis. In general characteristics, common factors influencing the quality of health care were age, marital status, education level, and subjective health status. In variables related to health care utilization, unmet healthcare needs, and limitation of dental care utilization were the significant factors affecting quality of health care. The results of this study show that various factors influence quality of health care. These findings can be used to develop strategies to improve health care.

• The Journal of Korea Assosiation for Disability and Oral Health
• /
• v.7 no.1
• /
• pp.15-20
• /
• 2011

A person with neurological disorder is defined as a person with limitation of ambulation or basic life activity due to the cerebral palsy or traumatic brain damage, stroke. Recently, the DMFT of the children with neurological disorders is similar or lower than the DMFT of the children with no disability. But, this article is about the severe-early childhood caries in children with grade 1 neurological disorder. It is supposed that the primary motor impairment and secondary physical weakness, frequent hospitalization, sugar- rich food and drugs, lack of oral care, delayed dental visit made high caries susceptibility. In case of treatment of the children with severe neurological disorders, dentists should make a thorough caries preventive plan based on individualized caries risk assessment. Also parents and medical doctors should recognize the importance of oral care and do the early dental visit and home care.

• Journal of Korea Water Resources Association
• /
• v.44 no.5
• /
• pp.351-362
• /
• 2011

The soil moisture measurements and correlation analysis are presented to improve understanding the hydrological process at the hillslope scale. The rainfall events is a main driver of soil moisture variation, and its stochastic characteristic need to be properly treated prior to the correlation analysis between soil moisture measurements. Using field measurements for two designated periods during the late summer and autumn seasons in 2007 obtained from the Bumrunsa hillslope located at the Sulmachun watershed, prewhitened correlation analysis were performed for 8, 14, 7 and 7 relationships representing the vertical, lateral, recharge and return flows, for two designated periods, respectively. The analysis indicated both temporal and spatial variation patterns of hydrological processes, which can be explained by the relative contribution of matrix and macropore flows and the impact of transect topography, respectively.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2017.05a
• /
• pp.552-552
• /
• 2017

본래 식용으로 들여온 외래어종은 우리나라 하천에서 토착 어류의 생태계를 교란시키며, 빠르게 서식처를 확산하고 있다. 일반적으로 알려져 있는 외래어종인 배스와 블루길 이외에도 무지개 송어 및 향어도 외래어종으로 분류된다. 본 연구는 외래어종 중 배스와 블루길을 대상으로 여러 환경적 요인에 따른 서식처 형성을 관찰하고 외래어종의 생태활동 변화를 분석하는 것을 목적으로 수행하였다. 여러 연구에 따르면 수온과 용존산소가 담수 어류의 서식환경 구축을 결정하는 매우 중요한 인자임을 알 수 있다. 이에 따라, 외래어종의 서식처 형성에 영향을 미치는 여러 환경적 요인 중 수온을 주요 인자로 선정하여 실험실 실험을 수행하였다. 연구를 수행하기 위해 하천 및 농업용 저수지로부터 배스와 블루길을 채집하였다. 채집된 외래어종을 길이 12 m, 깊이 0.6 m, 폭 1 m의 하천과 유사한 자연적 환경이 갖추어진 수조에 이식하였다. 수조 내 환경은 독립변인인 수온을 제외하고 모두 동일하게 구성하였다. 수조를 3개의 구역으로 구분하여 양 끝단에 냉수대와 온수대를 조성하였으며, 중간부의 평균 수온대를 기준으로 냉수대와 온수대의 수온 차는 약 $1^{\circ}C$이상 유지되도록 설정하였다. 현재까지의 실험 결과에 따르면, 외래어종은 온수대에 서식처를 형성하였다. $1^{\circ}C$의 수온 차에도 매우 민감하게 반응하며, 냉수대에는 서식처를 형성하지 않는 것 또한 확인되었다. 이를 통해 수온이 외래어종의 서식처 형성에 매우 중요한 영향을 미치는 요인인 것으로 판단된다. 연구 과정에서 추가적으로, 먹이 금붕어가 부재할 경우 동종 어식을 하는 것이 관찰되었다. 수조 내 수온에 따른 구역의 구분을 위해 공통으로 설치된 가림판 부근에 외래어종의 군락이 형성된 것을 통해, 향후에는 외래어종의 서식처 형성과 장애물과 같은 지형적인 요인이 미치는 영향에 관한 연구가 필요할 것으로 판단된다. 춘계는 수온의 증가로 외래어종이 더욱 왕성한 활동을 하는 시기이다. 수온이 외래어종의 서식처 형성에 지배적인 영향을 미치는 것이 실험을 통해 확인하였으나, 수온에 대한 민감도에 관한 연구 또한 필요하다. 더불어 외래어종의 계절에 따른 먹이활동 및 생장량 또한 지속적으로 관찰할 것이다.

• Geophysics and Geophysical Exploration
• /
• v.19 no.1
• /
• pp.11-19
• /
• 2016

Two representative residual static methods of traveltime decomposition and stack-power maximization are discussed in terms of application to land seismic data. For the model data with synthetic shot/receiver statics (time shift) applied and random noises added, continuities of reflection event are much improved by stack-power maximization method, resulting the derived time-shifts approximately equal to the synthetic statics. Optimal parameters (maximum allowable shift, correlation window, iteration number) for residual statics are effectively chosen with diagnostic displays of CSP (common shot point) stack and CRP (common receiver point) stack as well as CMP gather. In addition to removal of long-wavelength time shift by refraction statics, prior to residual statics, processing steps of f-k filter, predictive deconvolution and time variant spectral whitening are employed to attenuate noises and thereby to minimize the error during the correlation process. The reflectors including horizontal layer of reservoir are more clearly shown in the variable-density section through repicking the velocities after residual statics and inverse NMO correction.

• Journal of Korean Society of Forest Science
• /
• v.109 no.4
• /
• pp.532-543
• /
• 2020

This study was conducted with the aim of comparing and analyzing the relationship between visitors' characteristics and service satisfaction, overall satisfaction and loyalty (revisit intention, recommendation intention) of recreational forests and arboretums. The main results are as follows. First, the scores given for service satisfaction, overall satisfaction, and loyalty of the users of the recreational forests were all higher than those given by the visitors to arboretums, and the service satisfaction level was relatively different from that of the overall satisfaction level or loyalty of the users. Second, the service satisfaction level of the recreational forests did not affect the overall satisfaction level and visitor loyalty, whereas the service satisfaction level of the arboretum was found to be positively correlated with the overall satisfaction level and visitor loyalty. The results are meaningful given that the visitors to recreational forests and arboretums are distributed throughout the country; thus, we confirmed that there are differences in visitor characteristics between the two types of forest recreation areas. In order to differentiate operation strategies for each type of forest recreation areas, the development of common survey items covering the entire set of services provided by forest recreation areas is needed. In addition, it would be advantageous to further develop and modularize the relevant items and conduct surveys in parallel with common survey items, as the service contents are operated selectively to function in accordance with the purpose of creating each forest recreation area.

• Journal of the Korean Chemical Society
• /
• v.52 no.2
• /
• pp.155-163
• /
• 2008

.A simple and reproducible method for the rapid extraction and determination of trace amounts of copper(II) ions using mesoporous organo-silicas mesoporous silica and atomic absorption spectrometry is presented. Common coexisting ions did not interfere with the separation and determination. The preconcentration factor was 100 (1 ml elution volume) for a 100 ml sample volume. The limit of detection of the proposed method is 1.0 ng ml-1. The maximum sorption capacity of sorbent under optimum conditions has been found to be 5mg of copper per gram of sorbent. The relative standard deviation under optimum conditions was 2.8% (n=10). Accuracy and application of the method was estimated by using test samples of natural and synthetic water spiked with different amounts of copper(II) ion.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2019.05a
• /
• pp.143-143
• /
• 2019

우리나라 자연수역의 수질이 산업활동으로 배출된 오 폐수와 토지 및 가축에의한 하천오염의 심각성 및 보존에 대한 문제가 많은 관심을 받고 있다. 따라서 하천의 수질모델링에 관한 연구가 국내외적으로 진행되고 있다. 하천은 각기다른 특성을 가지고 있는데 데이터 분석을 통하여 유역특성을 연구하고자한다. 황강과 금호강은 낙동강 본류에 큰 영향을 미치는 지류이다. 두 개의 하천은 상류에 댐이 있다는 공통점이 있지만 각각의 유역특성을 가지고 있으며 특성에 따른 수질개선방안이 필요하다고 판단된다. 하천의 수질 모델링은 해당 수계의 오염부하량, 유출량 등 환경요인의 변화에 이에 따른 하천수질 목표지점의 수질변화를 모의함으로써 합리적 접근방법으로 효과적인 수질관리가 가능하도록 만들어준다. QUAL계열 모델 은 수질항목, 수역 특성, 기타 기초 자료의 제공여건 등을 고려하고 있다. 본 연구에서는 이러한 변화 요소와 기여 특성을 반영한 모의와 해석이 최적화된 QUAL-MEV 모델을 이용하였다. 수질개선방안 시나리오에서는 기존의 수질모델링 연구에 데이터 분석을 포함하여 각 인자간의 연관성 및 영향관계를 파악하고 수질개선방안에 있어 원인을 찾아보고자 한다. 부하량위주의 기존 시나리오 구성과 데이터분석 기반의 시나리오를 비교 분석하여 각 시나리오의 장 단점을 비교하여 유역맞춤형 관리방안을 모색하고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2019.05a
• /
• pp.540-542
• /
• 2019

With many announcements on air pollution and human effects from particulate matters, particulate matter forecasts are attracting a lot of public attention. As a result, various efforts have been made to increase the accuracy of particulate matter forecasting by using statistical modeling and machine learning technique. In this paper, the particulate matter AQI index prediction is performed using the multilayer perceptron neural network for particulate matter prediction. For this purpose, a prediction model is designed by using the meteorological factors and particulate matter concentration values commonly used in a number of studies, and the accuracy of the particulate matter AQI prediction is compared.

• Clinical and Experimental Pediatrics
• /
• v.48 no.1
• /
• pp.13-20
• /
• 2005

Purpose : Obesity is, along with metabolic syndrome, closely related with nonalcoholic fatty liver disease. This study tried to evaluate the prevalence of nonalcoholic liver disease in obese children and verify the factors associated with the disease. Methods : Two hundred and seventy nine children who showed a body mass index of 95 percentile over the baseline in health examinations of surrounding schools were evaluated. Questionnaires, body measurements, blood examinations, and ultrasonographic measurements of abdominal fat were examined. Results : Out of 279 children enrolled for the study, 27 children were found to possess nonalcoholic liver disease(9.7%). Among those found to be positive for nonalcoholic liver disease, it's prevalence increased to 15.2%(22 out of 144 children) among children with severe obesity. Factors known to be involved with metabolic syndrome, namely waist/hip circumference ratio and thickness of abdominal fat, were found to be closely related to nonalcoholic fatty liver as well. Conclusion : The prevalence of nonalcoholic fatty liver in obese children was 9.7%, with higher incidence observable in severer obesity. Factors responsible for metabolic syndrome were closely associated with nonalcoholic fatty liver disease, and the level of insulin resistance, which is an useful index in both diseases, can be utilized in evaluation of the effect of treatment and control of risk factors.