• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.260-265
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• 2004

The materials of ship screw propeller are commonly the manganese bronze. The seawater corrosion and cavitation of the screw propeller reduce tire propulsive performance of ship. In screw manufactory, tire corrosion rust of tire screw propeller is removed by a hand grinding. The grinding work makes the dust of the heavy metals from the manganese bronze. The dust makes indoor working environment poor. A friendly-environmental and automatic corrosion removing apparatus was developed for the improvement of screw processing and working environment. The corrosion rust of a screw propeller was remarkably removed by using apparatus. And the screw surface roughness was improved by a blasting effect of the apparatus performance test. Anode polarization curves on jour processing conditions, that is to say, grinding, blasting, wire-brushing, fine sand papering, were confirmed by a potentiostat. Especially, two kinds of medias, alumina and emery, were used in the blasting processing. Then, investigated tire cavitation erosion of specimen. This result proved that tire blasting work has considerably improved the corrosion resistance of a screw propeller.

• 임상간호연구
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• 제14권1호
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• pp.173-185
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• 2008

Purpose: The purpose of this study was to identify the effects of multimedia educational program of the prevention of respiratory disorders on knowledge and behavior of preschool children. Method: The research design used a nonequivalent control group pre-posttest. 32 subjects in the control group received no intervention, 33 subjects in experimental group received a multimedia educational program that consists of video, named 'The strong girl and weak girl', 5 different picture boards, method of hand washing, tooth brushing, and reinforcement. The data were analyzed by using $x^2$-test and t-test for determining of homogeneity and testing the hypothesis. Results: There were significant increases in knowledge and behavior in the experimental group compared to the control group. Conclusion: From the results of this study, the multimedia educational program significantly increased knowledge and behaviors of preschool children for preventing respiratory disorders. These findings suggest that a multimedia educational program can be used as an efficient nursing intervention of preschool children for preventing respiratory disorders.

• 동아시아식생활학회지
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• 제20권5호
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• pp.794-801
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• 2010

The effects of a nutritional education program featuring cooking activities on 20 preschool children 6 years of age at a kindergarten in the Daegu suburb area. After applying the nutritional education program for 6 weeks, scores of dietary habits, dietary attitude and problematic dietary behaviors increased significantly from 3.68 to 3.83, 3.52 to 3.9 and 3.59 to 3.89, respectively (p<0.001). Problematic dietary habits, such as not eating a variety of foods, overeating, and having an unbalanced diet, were positively affected while problematic dietary behaviors, such as eating too much sweet food and liking instant foods, also underwent favorable changes. Among dietary attitudes, washing bands and brushing teeth before and after meals were the least changed items (0.15 out of 1). To improve dietary habits and behavior of preschool children, nutrition education programs cooking activities must be applied systematically.

• 대한지역사회영양학회지
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• 제22권4호
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• pp.336-346
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• 2017

Objectives: The study was performed to investigate the relationship between snack intake and oral health behavior in middle school students in Gyeonggi-do area. Methods: The survey questionnaire was recorded by middle school students from July 6 to August 24, 2011. The questionnaire included items on general characteristics, snack intake status, and oral health behavior. Among collected survey questionnaire, a total of 620 questionnaires (320 males and 300 females) were analyzed using SPSS 15.0 program. Results: Frequencies of snack and beverage intakes were significantly higher in males than in females (p < 0.001). Oral health behavior was significantly higher in students with lower snack intake compared to those with higher or average snack intake (p < 0.05). Oral health behavior for tooth brushing and toothbrush care were significantly higher in females than in males (p < 0.05). Conclusions: Oral health behavior score that reflected better oral health of the subjects were higher as the snack intake was lower. Oral health behavior score was higher in females than in males. We conclude that the contents for oral health and nutrition education focused on snack intake need to be developed to induce changes in oral health behavior in middle school students.

• 한국환경보건학회지
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• 제15권1호
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• pp.19-32
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• 1989

This study was performed to evaluate the worker exposure to asbestos fibers in automobile repair shop and brake lining store from August 11 to October 21, 1988. In addition, the exposure of general population near the brake lining store was also evaluated. Results of this study were as follows. 1. Worker exposure level to asbestos fibers in automobile repair shop was 0.1 fibers/cc, well below the Korean standard of 2 fibers/cc, and a half of the U.S. standard of 0.2 fibers/cc. 2. Average worker exposure level to asbestos fibers in brake lining store was 0.35 fibers/cc, which was within the Korean standard of 2 fibers/cc, but exceeded the U.S. standard of 0.2 fibers/cc. 3. Worker exposure levels during the removal of brake dust with the compressed air blowing and the dry brushing were approximately 4 fibers/cc and 0.2 fibers/cc, respectively. During grinding of brake linings with sand paper, asbestos exposure level was 0.3 fibers/cc. 4. Ambient asbestos concentrations outside the brake lining store were 0.1 fibers/cc at the distance of 3-4 m, and 0.01 fibers/cc at the distance of 30 m.

• 한국의사학회지
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• 제27권1호
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• pp.41-50
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• 2014

This article is about the study on pictures of Daoist exercises described in Euibangyoochi- which is the largest book in Joseon Dynasty. Daoist exercises are the active exercises to prevent disease by training their body. In Euibangyoochi, there are lots of information of Daoist exercises. Specially, pictures of Daoist exercises are from '$q{\acute{u}}xi{\bar{a}}nhu{\acute{o}}r{\acute{e}}$nxīnf$\bar{a}$ng'. There are movements of body, methods of respiration, tooth brushing, and hand clapping in Daoist exercises this book. On the other hand, the pictures of Daoist exercises were composed with simple explanations so that readers actually might follow the directions at ease. There are 8 pictures of Daoist exercises left in Euibangyoochi. Those are Daoist exercises tradition in the midium of Joseon Dynasty which led to Hwalinshimbang of Yi-hwang. Also with the trend of preventing disease in these days, the importance of Daoist exercises is emphasized and these pictures became a tool of teaching the old Daoist exercises.

• 한국치위생학회지
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• 제6권4호
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• pp.361-374
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• 2006

The purpose of this study was to obtain basic data for development of oral health educational program on the control of handicapped children at social welfare facilities. For this research, it was investigated by a survey on the actual condition of dental health of handicapped children, and simultaneously by analyzing the relationships between the realities of child's dental condition and parents and guardian's acknowledgments and managements with regard to the dental health of children. This survey was conducted 135 children and their guardians being 4 social welfare facilities in Ulsan metropolitan city. 1. The average of DT, MT, FT and DMFT index were 1.82, 0.01, 0.98 and 2.84 respectively. 2. Rolling Toothbrushing method was the highest response(58.5%) and 3 times per a day(77.0%). A proxy of toothbrushing was parents(39.2%) and teacher(60.8%). 3. Recognition routes of toothbrushing method were family(13.3%), school(43.7%) and dental chinic(42.2%). 4. The numer of times electromotion tooth brushing was the highest response in more than 4 times per a day. Toothbrushing after eating between meals was higher negative response(50.4%). The number of times visiting dental clinic was the highest response in more than 5 times during a year(51.9%).

• Design & Manufacturing
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• 제11권3호
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• pp.51-55
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• 2017

Micro fuel cells have high reliability and long usage time. Among them, PEMFC (polymer Electrolyte Membrane Fuel Cell) is suitable as a portable power source because it is easy to fix electrolyte and simple structure. The bipolar plate, a key component of the fuel cell, is produced by cutting. In the case of micro fuel cell separator, burr is very small and the flow channel size in the separator is very small. Therefore, it is difficult to remove burrs in the usual way such as a brushing or ultra-sonic method. Therefore, this study proposed electrolytic polishing process and analyzed the characteristics of each condition by introducing the concept of roughness reduction rate. In addition, the ultrasonic process was added to analyze the effect of ultrasonic addition.

• 펄프종이기술
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• 제46권5호
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• pp.35-42
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• 2014

Many historical archives have been deteriorated by aging with time. Various kinds of defects such as worm-hole, yellowing, brittleness are observed and their severity was dependent on raw material type, storage condition, and so on. For a long-term use and storage, a proper preservation treatment is required. Many studies on preservation and conservation have been carried out on hanji which was made from mulberry fiber, but there are few concerns on foreign paper. Therefore, aging and chemical strengthening treatment was done on paper made of bamboo and wood fibers depending on aging condition, the type and pickup weight of chemicals and treatment method. When methyl cellulose was treated with impregnation or brushing, the aged paper was strengthened effectively. The strengthening effect by chemicals was dependent on the aged condition of the paper.

• 보건의료산업학회지
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• 제6권4호
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• pp.27-36
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• 2012

This study was to identify oral health status, O'Leary index and OIDP for the preventive oral prophylaxis among adults who visited dental hospitals or clinics from 30th September in 2011 to 31th May in 2012. The results are as follows. In DMFT, female(8.79) was higher than male(7.65)(p<.05). Housewife(9.70) and agriculture fishery industry was higher than others(p<.01). In O'Leary index, male(47.41), over 50 years old and 200~300 million won were higher than others. but these results wasn't significantly different. The majority answer about discomfort feeling in OIDP was during meal(66.7), and period of discomfort was 1~2 time/month(29.6). The discomfort feeling in OIDP effected on meal(40.8)and teeth brushing(50.0). The difficulty in daily life were toothache(21.0), cold feeling(20.8), and crowding(19.3). In conclusion, the negative factor of oral health status didn't effect daily life. These findings are require of development of oral health management program which included the prevention of toothache and cold feeling.