• Journal of Advanced Navigation Technology
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• v.24 no.1
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• pp.28-36
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• 2020

Korea augmentation satellite system (KASS) is the Korean satellite based augmentation system (SBAS) developed by ministry of land, infrastructure, and transport (MOLIT) since 2014. Since KASS is the safety critical system that can affect to the safety of airplane, the software of KASS is developed according to the DO178B software level induced from safety analysis. In case of KASS control station (KCS), most of the software of KCS get assigned software level E in DO178B. In that case, ECSS-Q-ST-80C category D is assigned as a software product assurance standard. In this paper, the software related standard ECSS-E-ST-40C, ECSS-Q-HB-80-04A are analyzed to satisfy ECSS-Q-ST-80C and as a result the software product assurance activities regarding software life cycle and the software quality model, metric is proposed for the product assurance of the KCS software.

• Journal of Environmental Science International
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• v.28 no.3
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• pp.357-369
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• 2019

In this study, the water quality components (pH, BOD, COD, TOC, SS, DO, TP) and the water quality, observed for 10 years (2008~2017) in the five tributaries of the Nakdong River with the highest flow rates, were analyzed. Monthly levels of the water quality components were estimated and regression functions were used to quantitatively explain the changes in the BOD and COD components, with respect to the TOC components. The results of analyzing the water quality levels in terms of the living environmental standards show that the lowest water quality was observed midstream (ST-3) and the highest water quality was observed upstream (ST-1 and ST-2). The regression function was estimated to be a linear function in all five tributaries, and the goodness of fit of the function was high upstream (ST-2), midstream (ST-3), and downstream (ST-4). According to the regression analysis using the observation data from 2008~2017, we found that the consumption of dissolved oxygen increased with an increase in organic matter in the major tributaries of the Nakdong River.

• Journal of The Geomorphological Association of Korea
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• v.26 no.4
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• pp.67-79
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• 2019

This study documents the level of paleo-shoreline and the timing of formation of the lowest marine terrace (1st terrace) distributed in Dadaepo, Busan, South Korea. In the study area, the elevation of paleo-shoreline of the 1st terrace is clearly identified as 5 meters above mean high tide based on the elevation of wave-cut platforms and the elevation of boundary between marine and terrestial sediments. This is well consistent with the fact that are found along the Southern coast of the Korean Peninsula including Daepo-dong, Sacheon-si. The timing of formation of the 1st terrace in Dadaepo is confirmed to have been deposited around 70,000~80,000 years BP (MIS 5a) according to OSL and IRSL dating ages. However, because the formation age of the 1st terrace in Sacheon-si Daepo-dong (Southerm coast) and Pohang-si Umok-ri (Eastern coast) previously identified as about 90,000~100,000 years BP (MIS 5c), further discussion of what is needed. Possibly, it can be interpreted that the sub-interglacial (MIS 5a and 5c) sea-level records during the last interglacial period are likely to be selective on land depending on regions.

• The korean journal of orthodontics
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• v.54 no.3
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• pp.142-152
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• 2024

Objective: This retrospective cohort study aimed to assess and compare the accuracy of 3 different Invisalign^® treatment regimens in terms of variations of aligner change frequency and type of aligner material in achieving maxillary dental buccal expansion. Methods: Altogether, 120 adult patients whose treatment involved maxillary dental expansion with Invisalign^® were included. The patients were divided into 3 groups, with each group comprising 40 patients as follows: SmartTrack^® 1-week changes (ST1), SmartTrack^® 2-week changes (ST2), and EX30^® 2-week changes (EX2). The groups were assessed by comparing actual changes achieved with those prescribed by ClinCheck^®. The rates of clinically significant inaccuracies (CSI) observed for buccal expansion (≥ 0.5 mm) and buccolingual inclination (≥ 2°) during expansion were then determined. Results: In terms of expansion, the ST1 group demonstrated the highest CSI rate at all tooth levels, whereas the ST2 group had the lowest rate of CSI and the lowest mean inaccuracy for each tooth level. In terms of buccolingual inclination, the ST1 group had the highest CSI rate across all tooth levels, whereas the EX2 group had the lowest CSI rate at all tooth levels except for the canine level where the ST2 group had the lowest CSI rate. A tendency toward overexpression of buccal crown inclination, and underexpression of buccal expansion was observed at all tooth levels. Conclusions: Two-week aligner change regimens offer improved accuracy compared with 1-week aligner changes. SmartTrack^® 2-week changes were the most accurate for buccal expansion, whereas EX30^® 2-week changes were the most accurate for buccolingual inclination.

• Journal of Hospice and Palliative Care
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• v.2 no.2
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• pp.91-100
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• 1999

Purpose : This study was performed to investigate the satisfaction in the hospice services provided for inpatient families and bereaved families whose members had been admitted to the hospice unit at Kangnam St. Mary's Hospital to improve the quality of care for the terminally ill patients and their families. Methods : This sample consisted of 33 families of hospice patients during the period of April to lune, 1998 and 30 bereaved families whose patients had died from March, 1993 to March, 1998. The data were collected through a self-report questionnaire and analyzed using t-test and ANOVA. Results : 1) The satisfaction level of inpatient families and bereaved families showed the mean value of 3.5 where the highest value is 5.0. 2) According to age, the level of satisfaction of inpatient families had significant differences in the fields of hospice philosophy, support for the family, medical management and nursing management(P=0.0001). The level of satisfaction of bereaved families showed significant differences in the field of support for the family, medical management, nursing management, and facilities of the hospice unit(P=0.0001). 3) By family relationship, the level of satisfaction of inpatient families had significant differences in the fields of hospice philosophy, support for the family, medical management and nursing management (P=0.0001). 4) According to religion, the level of satisfaction of inpatient families had significant differences in the fields of hospice philosophy, support for the family and nursing management (P=0.0001), but there was no significant difference for the bereaved families. Conclusions : The findings of this study showed that hospice services had positive influence on families with terminal disease such as cancer. To improve the level of satisfaction in the hospice services for families with hospice patients, we need to provide care by an interdisciplinary hospice team approach, and to assess needs of the families according to their socio-psychological characteristics. Further studies need to be conducted with large samples.

• Journal of dental hygiene science
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• v.16 no.3
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• pp.200-209
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• 2016

The purpose of this study is to compare the dental health capacity of smokers and nonsmokers. This study included 9,856 adults aged 19 years or older. The data used for analysis were obtained from the Korean National Health and Nutrition Survey for the 6th round, 1st (2013), and 2nd round (2014). Statistical analysis was performed by analysis of complex sample survey data. The demographic characteristics and results of the comparison of the dental health capacity between smokers and nonsmokers were as follows: with regard to the tissue health (T-health) index, the sex, age, and education level were statistically significant in smokers and nonsmokers. For the functioning teeth (FS-T) index, age, income, and education levels were statistically significant in smokers, while sex, age, and education level were statistically significant in nonsmokers. In smokers, the age and education level were statistically significant for present teeth (PT), sound teeth (ST), and missing teeth (MT), while in nonsmokers, the sex, age, and education level were statistically significant for the same parameters (p<0.05). A comparison of the dental health capacity between smokers and nonsmokers yielded the following findings: the T-health index was higher in smokers, while the FS-T index was higher in nonsmokers. PT and ST were higher in nonsmokers (p<0.05). The results of this study show that the dental health capacity of nonsmokers was higher than that of smokers. Therefore, a clear difference was observed in the dental health capacity of smokers and nonsmokers. The results of this study can provide objective data for nonsmoking treatment.

• Journal of the Korean housing association
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• v.25 no.6
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• pp.39-47
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• 2014

The background of this study is to examine the structure of housing price of which characteristics are not equal but hierarchical in the apartment complexes. So, the purpose of this study is to analyze the influences of apartment complex characteristics on the housing price within the same regional boundary by HLM. The data used as dependent variables were the market prices of 938 units from 29 apartment complexes by stratified sampling. The 2nd level independent variables is the Housing complex characteristics which are composed of the housing complex & locational variables and the 1st level independent variables are the unit characteristics. The results are as follows. First, the first model shows that the 2nd level variables explains 68% of the housing prices. Second, the influential variables of the 1st level unit variable are 'dwelling exclusive area', 'floor of dwelling' and 'direction of dwelling'. Third, the influential variables of the housing complex variables in the 2nd level are 'lot area', 'the building-to-land ratio', 'the number of unit', 'the number of parking lots per unit', 'Green space area' and 'open space area per unit'. The last, the influential variables of the housing locational variables in the 2nd level are 'distance to subway and park' and the number of school and park within a radius of 1km.

• Journal of Food Hygiene and Safety
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• v.6 no.3
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• pp.147-155
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• 1991

Enterotoxigenic E. coli is one of the major causative agents of the infantile diarrhea and traveler's diarrhea. The heat-stable enterotoxin(ST) is thought to be a virulence factor in the pathogenesis of the diarrhea and to be a maker for identification of the enterotoxingeic E. coli from non pathogenic E. coli. The isolate of enterotoxigenlc E. coli was isolated from swine during 1989 year(from 5 to 10 month) in the Kyong-gi and Chung-Cheong provinces, and three strains(KM-4, KM-7 and KM-12) was selected from 189 isolates of ST producing E. coli. The detection of a ST produced of the isolated E. coli was performed by the infant mouse assay(IMA). This study was designed to know optimal conditions for the production of the ST and the molecular properties of plasmids of the enterotoxigenic E. coli. Amount of ST produced were the most at initial pH 8.5~9.0 of succinate salts medium culture. The cultural time of the same medium was accumulated the highest level of ST was at the 14 to 16 hours, and then stationary phase was at the 20 hours. From this experiment the KM-7 strain was selected among ST producing strains by IMA. Partial plasmid-curing experiment was done to select plasmid encoding for ST among other plasmids and then comparing the plasmid pattern of ST producing strain(KM-7) with those of other ST non-producing strains, it is found that ST gene exists on the about 80 Kbp plasmid. Each fragment of this plasmid digested with EcoRl was ligated to vector pBR 322 and transformed into E. coli K-12. A clone producing ST(eKT 53) was selected by IMA. The EcoRl digestion pattern of the isolated plasmid(pKD 37) from the ST producing clone it is indicated that the size of the inserted fragment in eKT 53 strain is 16 Kbp. The cultured supernatant of eKT 53 strain was positive result of ST production in IMA.

• Journal of Agricultural Extension & Community Development
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• v.23 no.4
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• pp.459-470
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• 2016

The purpose of this study was to examine the accomplishments and problems of National Target Program on New Rural Development(NTP-NRD) of the Vietnam government during the 1st stage(2011-2015). Based on the literature review and interview, the following suggestions were drawn with related to 19 criteria and 39 indicators; 1) the relationship between the overall goal and 19 criteria as its measures seems to be inconsistence, so that the meet of the 19 criteria regarded as the goal of the NTP-NRD, 2) there was no measures for the communes, where met the requirement of 19 criteria early, 3) most indicators were output oriented, while outcome level were little, 4) it needed to adjust for the some indicators as the implementation unit from commune level to more wider spatial level.

• Journal of Chest Surgery
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• v.48 no.5
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• pp.335-344
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• 2015

Background: A raised carcinoembryonic antigen (CEA) may be associated with significant pathology during the postoperative follow-up of lung adenocarcinoma. Methods: We reviewed the medical records of 305 patients who underwent surgical resections for primary lung adenocarcinoma at a single institution between April 2006 and February 2013. Results: Preoperative CEA levels were significantly associated with age, smoking history, pathologic stage including pT (pathologic tumor stge), pN (pathologic nodal stage) and overall pathological stage, tumor size and differentiation, pathologically positive total lymph node, N1 and N2 lymph node, N2 nodal station (0/1/2=1.83/2.94/7.21 ng/mL, p=0.019), and 5-year disease-free survival (0.591 in group with normal preoperative CEA levels vs. 0.40 in group with high preoperative CEA levels, p=0.001). Preoperative CEA levels were significantly higher than postoperative CEA levels (p<0.001, Wilcoxon signed-rank test). Postoperative CEA level was also significantly associated with disease-free survival (p<0.001). A follow-up serum CEA value of >2.57 ng/mL was found to be the appropriate cutoff value for the prediction of cancer recurrence with sensitivity and specificity of 71.4% and 72.3%, respectively. Twenty percent of patients who had recurrence of disease had a CEA level elevated above this cutoff value prior to radiographic evidence of recurrence. Postoperative CEA, pathologic stage, differentiation, vascular invasion, and neoadjuvant therapy were identified as independent predictors of 5-year disease-free survival in a multivariate analysis. Conclusion: The follow-up CEA level can be a useful tool for detecting early recurrence undetected by postoperative imaging studies. The perioperative follow-up CEA levels may be helpful for providing personalized evaluation of lung adenocarcinoma.