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최부영 ( Boo Young Choi ),박선화 ( Sun Hwa Park ),오효원 ( Hyo Won Oh ),이흥수 ( Heung Soo Lee ) 대한예방치과·구강보건학회 2010 大韓口腔保健學會誌 Vol.34 No.2
Objectives. The purpose of this study was to investigate the correlation between the oral health locus of control and the oral health behavior and attitude. Methods. 280 girls in W high school located in Ik-san city were chosen by the convenience sampling. A survey was made with the self-administration questionnaires. The questionnaires for the oral health locus of control were designed by the authors, and the internal locus of contol (ILOC) and the external locus of control (ELOC) were distinguished. Results. The oral health promotion behavior and attitude scale showed a significant positive correlation with ILOC, and the oral health promotion attitude scale showed a positive correlation with ILOC and a negative correlation with ELOC. The extraction of deciduous teeth in time among the oral health promotion behaviors showed the highest coefficient of correlation with the ILOC and ELOC. Such behaviors as toothbrushing after meal, toothbrushing before sleep, covering the multiple teeth with dental sealant, and taking the treatment after school oral examination showed the negative correlations with ELOC. The belief that early treatment is effective, taking good care of decayed teeth among the disease control is important, and preventing the oral diseases is economic showed a positive correlation with ILOC and a negative correlation with ELOC. The educational status of subject`s father was significantly correlated with ILOC. Conclusions. The oral health locus of control showed the statistically significant correlation with the oral health promotion behavior and attitude.
전라북도 일부 치과의사의 민영건강보험에 관한 인식과 태도
박소영 ( So Young Park ),이흥수 ( Heung Soo Lee ),오효원 ( Hyo Won Oh ),이완 ( Wan Lee ),최부영 ( Boo Young Choi ),주현정 ( Hyun Jeong Ju ) 대한예방치과·구강보건학회 2012 大韓口腔保健學會誌 Vol.36 No.2
Objectives: To identify dentists` perceptions regarding the possible introduction of private health insurance plans, thereby providing basic data to improve the existing dental health insurance system. Methods: A self-report survey was conducted with a total of 126 dentists in Jeollabuk-do Province. The survey was designed to gather information on the dentists` positions, perceptions and attitudes toward on a proposed introduction of privately run insurance schemes. Results: A negative general consensus was found for the privately run scheme. Also it appeared that an overall review was required. Conclusions: Considering the high percentage of negative responses in the present study, it seems necessary to pro-actively reflect and complement potential issues in the current system before implementing privately run schemes in efforts to establish a solid foundation for operating dental insurance plans best suitable to the needs and characteristics of premium payers.
박선화 ( Sun Hwa Park ),최부영 ( Boo Young Choi ),오효원 ( Hyo Won Oh ),이흥수 ( Heung Soo Lee ) 대한예방치과·구강보건학회 2010 大韓口腔保健學會誌 Vol.34 No.3
Objectives. The purpose of this study was to investigate the relationship between school children`s diet behavior and dental caries experience in an effort to lay the foundation for the development of student oral health promotion projects. Methods. The subjects in this study were 477 students at J elementary school located in Kimje city, Jeonlabukdo, Republic of Korea. Their dental caries experience, dietary habit and obesity level were investigated. A dental checkup was conducted by a dentist in compliance with the WHO criteria, and a self-administered survey was carried out to find out their dietary habit. As for the level of obesity, their height and weight were measured by automatic devices to figure out Rohrer, Broca and Kaup indexes. The collected data were analyzed by Speaman`s rank-order correlation analysis to look for connections between diet behavior and dental caries experience, and whether there were any gaps in their collective averages was checked as well. Results. The school children were different in dental caries experience according to daily habits of having a snack. Those who ate between meals often had a higher mean of caries teeth (DdFfMt index) than the others who scarcely did that. A habit of self-cleansing food intake made a difference to their dental caries experience. Those who rarely ate fruit had a higher dft index than the others who did that (once, twice or more a week). The children who disliked vegetables and greens had a higher dft index than the others who liked. As for a question whether they ever refrained themselves from eating something they wanted to eat due to the possibility of dental caries, 55.4 percent said yes. In regard to the criteria of snack choice, 8.9 percent gave top priority to whether to cause dental caries or not. There was no link between the level of obesity and DMFT index, and dft index had a negative correlation to Rohrer index. The obesity level was correlated to subjective oral health. A higher Kaup index, namely a higher level of obesity, lead to a more negative subjective oral health. Conclusions. The findings of the study lend credibility to existing theories that the habit of carcinogenic food intake increases the degree of dental caries experience, and that the habit of self-cleansing food intake curtails it. There was no marked relationship between obesity and dental caries experience in this study.
배경태(Gyeong Tae Bae),허선철(Sun Chul Huh),최부영(Boo Young Choi),문홍만(Hong Man Moon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The hydrostatic bearings have a relatively small run-out comparing to its shape error by fluid film effect in hydrostatic state as like pneumatic bearing and have a high stiffness, load capacity and damping characteristics. In this study, we could confirm the reliability of the analysis by assessing the thermal characteristics through measurement of the grinding machine temperature and thermo-structural analysis and comparing the measured thermal deformation with the result of the analysis, and could identify the overall thermal characteristics of the grinding machine
청소년들의 치과불안과 구강보건행태 및 우식경험도의 관련성
박선화 ( Sun Hwa Park ),이나경 ( Na Gyung Lee ),주현정 ( Hyun Jeong Ju ),최부영 ( Boo Young Choi ),오효원 ( Hyo Won Oh ),이흥수 ( Heung Soo Lee ) 대한예방치과·구강보건학회 2015 大韓口腔保健學會誌 Vol.39 No.1
Objectives: The purpose of this study was to examine the relationship of dental anxiety with oral health behavior and dental caries experience among adolescents. Methods: The subjects were 469 teenagers (238 middle school students and 231 high school students) in 15 different schools located in 7 regions of Bucheon in Gyeonggi Province, Daejeon, and others. A survey and interviews were conducted to evaluate subjects’ oral health behavior and dental anxiety. Dental anxiety was additionally assessed by Corah’s Dental Anxiety Scale. The caries experience of subjects was examined. Results: There were no regional differences in dental anxiety. Girls felt more dental anxiety than boys did. Adolescents who did not receive treatment even when they needed it felt more dental anxiety than those who did receive treatment. There were also statistically significant differences in dental anxiety according to the type of treatment received. Adolescents who received extraction treatment or underwent oral surgery experienced more dental anxiety than those who received orthodontic or aesthetic treatment. Those who had a toothache or who experienced gingival bleeding felt more dental anxiety than those who did not have those conditions. Subjects with poor perceived oral health also had more dental anxiety. The number of decayed teeth and filled teeth was significantly correlated with dental anxiety. Conclusions: In adolescents, dental anxiety is related to their oral health behavior, the type of conditions they present with, the treatment received, and dental caries experience. Therefore, the kind of systematic programs that could relieve adolescents of dental anxiety should be prepared.
허선철(Sun-Chul Huh),김귀남(Gwi-Nam Kim),박준성(joun-sung Park),최부영(Boo-Young Choi),박원조(Won-Jo Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Fracture toughness is an important parameter in designing structure applied in low temperature. The huge tesging machine and manufacturing of the testing specimen are the main shortages of the CTOD and FCG testing methods. Therefore, in this study the indentation tester AIS 3000 is applied to measure the fracture toughness. The experiment was conducted at RT, 0℃, -20℃ and -45℃, respectively. Furthermore, the fracture surface was observed by SEM. Through the results we can see that the fracture toughness was reducing through the temperature drop, and the highest fracture toughness in base metal and weld zone was measured at room temperature though there were a little peak at -20℃. As we expected, the highest fracture toughness in th HAZ was observed at -20℃ for procedding less brittle fracture at low temperature.
배경태(Gyeong-Tae Bae),김귀남(Gwi-Nam Kim),최부영(Boo-Young Choi),문홍만(Hong-Man Moon),노정필(Jung-Pil Noh),허선철(Sun-Chul Huh) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.1
To improve the accuracy of a machine, research needs to be conducted on the relationship between the output variables and design variables of a spindle-shaped part from the thermal and static viewpoints. Therefore, research was carried out by examining the correlation of each variable to find the optimum conditions. Moreover, DOE (design of experiments) was extensively used. The model used in this study was a grinding spindle to which a hydrostatic bearing was applied. This model was used in a preliminary analysis based on the experimental results of the previous studies. The influences of the output variables and design variables were compared through a main effect analysis. Generated response surfaces were applied to the Kriging model. To optimize the model, a screening method was selected. In comparison with the initial model, the deformation of the optimized model designed by DOE decreased by 4.1 ㎛, while the thermal deformation decreased by 1.2 ㎛. Therefore, it was efficient to design a spindle-shaped part through DOE to improve the accuracy of the machine.
허선철(Sun-Chul Huh),박원조(Won-Jo Park),김귀남(Gwi-Nam Kim),박준성(Jun-Sung Park),최부영(Boo-Young Choi) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Recently, shipbuilding design techniques is developing so fast. As a result, vessels and plant became large, and is required arctic vessel for polar resource development. However, steel show brittle nature at reduce temperature. So research of character is increased under low temperature. In this study, thick plate has been used to measure the fracture toughness to evaluate at low temperature, using AIS3000 indentation tester and impact tester. And micro structure analysis for fracture surface has been observed by SEM.
허선철(Sun-Chul Huh),박원조(Won-Jo Park),김귀남(Gwi-Nam Kim),박준성(Jun-Sung Park),최부영(Boo-Young Choi) 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
Kecently, shipbuilding design tectruques is developing so fast. As a result, vessels and plant became large, and is required arctic vessel for polar resource development. However, steel show brittle nature at reduce temperature So research of character is increased under low temperature. In this study, thick plate has been used to measure the fracture toughness to evaluate at low temperatue, using AIS3000 indentation tester and impact tester. And micro structure analsysis for fracture surface has been observed by SEM.