• Journal of Korea Water Resources Association
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• v.43 no.12
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• pp.1083-1091
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• 2010

Distributed hydrologic models typically require spatial estimates of precipitation interpolated from sparsely located observational points to the specific grid points. However, widely used estimation schemes fail to describe the realistic variability of daily precipitation field. We compare and contrast the performance of statistical methods for the spatial estimation of precipitation in two hydrologically different basins, and propose a two-step process for effective daily precipitation estimation. The methods assessed are: (1) Inverse Distance Weighted Average (IDW); (2) Multiple Linear Regression (MLR); (3) Climatological MLR; and (4) Locally Weighted Polynomial Regression (LWP). In the suggested simple two-step estimation process, precipitation occurrence is first generated via a logistic regression model before applying IDW scheme (one of the local scheme) to estimate the amount of precipitation separately on wet days. As the results, the suggested method shows the better performance of daily rainfall interpolation which has spatial differences compared with conventional methods. And this technique can be used for streamflow forecasting and downscaling of atmospheric circulation model effectively.

• Journal of dental hygiene science
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• v.14 no.4
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• pp.488-494
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• 2014

The purpose of this study is to analyze the association of oral health of the elderly and oral health quality of life. The subjects of this study were 282 participants who received the fluoride application and the scaling service through program targeting elderly people carried out by a public health center located in Gyeongsangbuk-do Province. Data were collected from January 2011 to December 2011. The result of comparing subscale scores of quality of life related to oral health depending on socioeconomic characteristics showed that functional limitation scores were lower as educational level got higher. The result of comparing subscale scores of quality of life related to oral health depending on status of oral health and frequency of tooth brushing showed that quality in functional limitations, physical pain, psychological discomfort, physical disability, psychological disability, social disability and handicap scores were lower as the number of cavities got more. The result of multiple regression analysis to identify the factors affecting the quality of life related to oral health showed that the number of cavities and installation of denture were significant variables. The results of this study showed that there was significant association of oral health status and oral health related quality of life of the elderly. In order to maintain the oral health related quality of life, it is important to keep many number of residual teeth even if a person gets older and to support the installation of dentures if necessary.

• Korean Journal of Agricultural and Forest Meteorology
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• v.22 no.3
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• pp.107-116
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• 2020

In this data paper, we share the dataset obtained during 2019 from the test-bed to develop soil moisture estimation technology for upland fields, which was built in Seosan and Taean, South Korea on May 3. T his dataset includes various eco-hydro-meteorological variables such as soil moisture, evapotranspiration, precipitation, radiation, temperature, humidity, and vegetation indices from the test-bed nearby the Automated Agricultural Observing System (AAOS) in Seosan operated by the Korea Meteorological Administration. T here are three remarkable points of the dataset: (1) It can be utilized to develop and evaluate spatial scaling technology of soil moisture because the areal measurement with wide spatial representativeness using a COSMIC-ray neutron sensor as well as the point measurement using frequency/time domain reflectometry (FDR/TDR) sensors were conducted simultaneously, (2) it can be used to enhance understanding of how soil moisture and crop growth interact with each other because crop growth was also monitored using the Smart Surface Sensing System (4S), and (3) it is possible to evaluate the surface water balance by measuring evapotranspiration using an eddy covariance system.

• Journal of the Korea institute for structural maintenance and inspection
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• v.15 no.3
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• pp.125-133
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• 2011

The requirement for durability of concrete bridge deck is increasing as the deterioration for the concrete bridge deck exposed to severe environment has been increased. For this reason, the concern about high-durable concrete is being high. Recently, a metakaolin is highly spotlighted as new admixture because its strength and durability are equivalent to silica fume. On the other hands, there are few researches for the metakaolin concrete bridge deck in domestic. So many various long-term data on the mechanical property and durability is needed to apply metakaolin concrete at the concrete bridge deck construction field. This study is aim to evaluate the long-term mechanical properties and durability of metakaolin concrete bridge deck with curing age. Mechanical properties are estimated by the compressive and flexural strength, and the drying shrinkage, the chloride resistance, the scaling, and freezing and thawing characteristics are compared with curing age. According to the results, when the metakaolin concrete is used, the development of compressive and flexural strength proceed in both the early and old ages. It is also improved the resistance of chloride penetration, freezing and thawing in concrete. It was showed that replacement of metakaolin was efficient for the reduction of the drying shrinkage.

• Journal of dental hygiene science
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• v.15 no.3
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• pp.325-332
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• 2015

The aim of this study was to investigate the relationship between the oral health status of elderly under visiting health care and their oral health-related quality of life. The subjects were 300 elderly under visiting health care program over 65 years old in Asan city and they were interviewed. The result showed that average Geriatric Oral Health Assessment Index (GOHAI) score was 37.36 and the lowest scored question was 'never satisfied with the oral condition'. In GOHAI related to oral health behaviors, unmet dental treatment experience was statistically significant (p<0.001). In overall GOHAI, number of remaining teeth (p<0.001) and the age had statistical significance and men had higher score in pain and discomfort (p<0.05), under age of 74 limited function factors score was high (p<0.01). The number of remaining teeth had statistical significances in most factors except pain and discomfort (p<0.001). The factors affecting GOHAI were age (p<0.05), number of remaining teeth (p<0.001) and perceived health state (p<0.001). In order to improve oral health-related quality of life of elderly receiving visiting oral health care services, it is necessary to increase denture support by securing budgets and developing oral health promotion programs at the local government level.

• Journal of dental hygiene science
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• v.16 no.5
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• pp.370-377
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• 2016

This study is conducted to provide a basis for effective management of bad breath with a poll in 155-scaling patients visiting the dental hygiene department of a university located in Gyeong-gi province after grasping the relevance among halitosis, xerostomia, and stress from them. Analysis was performed using PASW Statistics 18.0. The results of the halitosis measurements based on the general properties showed a significant difference in the hydrogen sulfide ($H_2S$) level depending on the patient's age; the highest level of 355.61 was observed in patients in their twenties followed by 227.85 in the fifties (p<0.001). The level was higher in cases with sinusitis or rhinitis (p=0.034). The $H_2S$ and $(CH_3)_2S$ levels showed are levant (r=0.492, p<0.01) correlation with the components of halitosis. Further, among other factors affecting breath odor, $(CH_3)_2S$ was shown to increase with increased stress. These results indicate that emotional factors, such as stress, should be considered when diagnosing patients with halitosis, and systematic and standardized diagnostic tools should be developed.

• Korean Journal of Agricultural and Forest Meteorology
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• v.9 no.2
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• pp.100-108
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• 2007

The Gwangneung KoFlux supersite, located in a rugged mountain region, is characterized by a low wind speed due to a mountain-valley circulation and rolling terrain. Therefore, it is essential to understand the effect of coordinate rotation on flux measurements by the eddy-covariance method. In this paper, we review the properties of three orthogonal coordinate frames (i.e., double, triple, and planar fit rotations) and apply to flux data observed at the Gwangneung supersite. The mean offset of vertical wind speed of sonic anemometer was inferred from the planar fit (PF) coordinate rotation, yielding the diurnal variation of about $\pm0.05ms^{-1}$. Double rotation $(\bar{v}=\bar{w}=0)$ produced virtually the same turbulent fluxes of heat, water, and $CO_2$ as those from the PF rotation under windy conditions. The former, however, resulted in large biases under calm conditions. The friction velocity, an important scaling parameter in the atmospheric surface layer, was more sensitive to the choice of coordinate rotation method.

• Journal of Digital Convergence
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• v.12 no.10
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• pp.445-453
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• 2014

The purpose of this study was to examine the necessity of oral health education to analyze the knowledge and status of oral health according to smoking in some college students. The subjects in this study were 217 selected college students, on whom a survey was conducted from September 3 to September 7, 2013. The data were analyzed using SPSS 19.0(SPSS 19.0 K for window, SPSS Inc USA). The findings of the study were as follows: First, concerning toothbrushing frequency, the smokers brushed their teeth twice, and the nonsmokers did that three times(p<0.05). The male students did toothbrushing twice, and the female students did that three times(p<0.05). As to scaling experience, the female students got their teeth cleaned more often(p<0.05). Second, the nonsmokers who had received oral health education outnumbered the smokers who had(p<0.01). In regard to the necessity of smoking-related oral health education, both of the smokers and the nonsmokers replied it was necessary(p<0.05). Third, as for the level of oral health knowledge, the nonsmokers were more aware than the smokers that the use of oral hygiene supplies had an effect on the prevention of dental caries(p<0.05). Given the findings of the study, the smoking-related oral health education and the development of programs that are intended for college students seems necessary.

• Journal of the Earthquake Engineering Society of Korea
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• v.14 no.5
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• pp.65-76
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• 2010

In this paper, earthquake fragility analysis has been comparatively performed with regard to a buried gas pipeline of API X65 which has been widely used in Korea. For this purpose, a nonlinear time-history analyses has been carried out for 15 different analytical models of a buried gas pipeline in terms of the selected 12 sets of earthquake ground motions with 0.1g of scaling interval. Following that, earthquake fragility analyses have been conducted using the maximum axial strain of the pipeline obtained from the nonlinear time-history analyses. Parameters under consideration for subsequent earthquake fragility analyses are soil conditions, end-restraint conditions, burial depth and the type of pipeline. Comparative analyses reveal that whereas the first three parameters influence the fragility curves, particularly soil conditions amongst the three parameters, the last parameter has a little effect on the curves. In all, the present study can be considered as a benchmark fragility analysis of a buried gas pipeline in the absence of an earthquake fragility analysis of the pipeline and thus is expected to be a useful source regarding earthquake fragility analyses of a buried gas pipelines.

• Journal of the Korea Convergence Society
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• v.9 no.12
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• pp.401-409
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• 2018

The purpose of this study was to examine the oral health care and self-rated health status of adults visiting dental clinics in the region of Busan and influential factors for their dental fear from January to May, 2017, in an effort to obtain some information on how to relieve fear. As for dental fear, adults who were in their 30s, who were homemakers and whose monthly income ranged from 4 to 4.99 million won. In regard to fear according to oral health care, dental fear caused by the treatment avoidance factor was stronger among the adults who didn't receive dental checkups and who brushed their teeth in the wrong way. Dental fear that was attributed to the physiological reaction factor and the stimuli-inducing factor was severer among the adults who didn't receive dental checkups and who had no scaling experience. Overall fear was severer among the adults who didn't receive dental checkups and who changed their toothbrushes every four or more months. The factors that affected dental fear were self-rated health status, self-rated oral health status, gender, age, whether to receive dental checkups on a regular basis or not, and oral health education experience. Therefore in order to alleviate dental fear, self-rated health status should be improved, and the kind of system that encourages regular dental checkups and provides oral health education should be prepared.