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Spring의 lumen size와 helical coil 형성 위치 변화가 교정력에 미치는 영향
이규선,이선경,김복동,Lee, Gyu-Sun,Lee, Sun-Kyoung,Kim, Bok-Dong 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.4
Purpose: The purpose of this study was to impact of force system change in finger spring that add helical coil one round on orthodontic force. Methods: The following conclusions were drawn from the experiment conducted after bending 90 samples with a CNC wire forming machine while changing the height and lumen size to 1mm - 3mm - 5mm and 2mm - 3mm - 4mm respectively in the coil of the force system in finger spring added with one wheel of helical coil of 18-8 stainless steel round wire (${\Phi}0.5mm$, spring hard) from Jinsung Co. in domestic market under the following conditions: Laboratory name = Instron 5942; Temperature($deg^{\circ}C$) = 18.00; Humidity(%) = 50.00; Rate 1 = 10.00000 mm/min; Compressive extension = 5.0mm. Results: When Coil height is 1, 3, 5mm and lumen size is 2, 3, 4mm reduce finger spring as mean value of compressive extension occasion maximum load(mN) increases as coil height rises, and lumen size grows to 5.0mm. And was expose that compressive load(mN) increases as coil position of finger spring rises and increase as lumen size is decrescent. Conclusion: As the adherence height of coil was raised from 1mm through 3mm to 5mm, compressive load increased. As the lumen size increased from 2mm through 3mm to 4mm, compressive load decreased. Therefore, these results suggest that it is desirable to lower the coil height and enlarge the lumen size to enhance the biomechanical efficiency of finger spring when manufacturing the finger spring for removable orthodontic devices.
이규선,송화경,김성민 한국의류학회 2020 Fashion and Textiles Vol.7 No.1
The objectives of this study are to identify the principal components that represent distinctive shapes from the silhouette and profile views of the lower body shapes of abdominal obese Korean men and to categorize their body types. Using 3D scans of 625 men aged 35–64 in the 6th SizeKorea dataset, 173 scans (27.7%) of men in ‘abdominal obese’ category (BMI value of 25, waist girth to height ratio of 0.53, and waist girth to hip girth ratio of 0.9 or higher) were utilized. We developed a script to measure 38 items such as front/back crotch length and front/back depths and angles using the SNU-BM program, which is a script-based automated 3D body scan measurement software. The measurements used for principal component (PC) analysis were 31 drops, 2 heights, 2 lengths and 4 angles. Ten PCs representing distinctive silhouettes and profiles of lower body shapes were extracted. The PCs were interpreted as follows: abdomen prominence, thigh to knee profile, upper buttocks prominence, waist to hip drop, thigh to knee silhouette, lower body tilt angle, waist to crotch length, vertical height, abdomen to crotch height, and lower buttocks slope. The three body shape groups were categorized using a K means cluster analysis with ten PC scores. Group 1 had a flat abdomen but prominent buttocks. Group 2 had a developed abdomen and buttocks with vertical thighs. Group 3 had drooped buttocks with tilted thighs.
李圭善,權銀子 동남보건대학 2001 論文集-東南保健大學 Vol.19 No.2
This study was designed to grasp the degree of job stress affecting dental technicians and the degree of the symptoms of their job stress. With this in mind, the researcher selected a total of 170 dental technicians living in Seoul and Incheon, conducting a research in a Period ranging from August 1, 2001, to August 20, 2001. The instrument used in this study was a structured questionnaire that turned out to be reliable and valid. The questionnaire consisted of 59 questions, including 13 for general characteristics 28 for job stress and 18 for job satisfaction. The researcher analyzed the findings with the aid of SPSS(Statistical Package for Social Sciences). The research came to draw the following conclusions on the basis of frequency. Percentage, t-test, F-test and multiple regression etc. The findings of this study are as follows: 1. The analysis of job stress of the subjects indicates that there are significant differences in difficult questions among their work places, working hours, academic backgrounds, job satisfaction and jobs(p<.05). The job stress stands at 3.48 on the average, and the area of conflict among too much work and job performance turns out to be highly Perceived. 2. As a result of analyzing the job satisfaction of the dental technicians investigated, working hours, marital status, job satisfaction and willingness of holding the job made a significant difference(P<.05). They were relatively satisfied with their job with a mean of 3.04. By item, they were pleased with the fact that their supervisors tended not to give contradictory directions or managers save coherent instructions. But they expressed dissatisfaction at the shortage of personal or leisure time and welfares for bonus, retirement allowance and health insurance. 3. There was a reverse correlation between job stress and job satisfaction(r=-0.227, P<.001). As every job stress area score was mostly reversely correlated to the job satisfaction scores, it's found that heavier job stress led to less job satisfaction. The above-mentioned findings suggest that dental technicians themselves should make active effort to handle and get rid of stress to be more satisfied with their jobs. In addition, it's needed to develop better stress-coping programs.