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        교정용 브라켓과 교정선 사이의 마찰력

        정태종,최목균 대한치과교정학회 2000 대한치과교정학회지 Vol.30 No.5

        교정용브라켓과 교정선 사이의 마찰력에 관련된 요소들에는 브라켓의 종류, 교정선의 재질과 형태, 결찰방법의 차이, 건조환경과 타액환경의 차이, 브라켓간 offset의 차이, 브라켓간 거리, 이동속도 등이 있다. 이러한 요소들에 따른 마찰력의 변화를 비교, 분석하여 각 요소들 간의 관계를 알아보고자 본 연구를 하였다. 8종류의 0.018" x 0.025" 상악 견치와 상악 제2 소구치용 브라켓을 슬라이드 위에 부착시키고 0.016" 및 0.016" x 0.022" 스테인레스 스틸 교정선과 같은 크기의 NiTi 교정선 및 Cu-NiTi 교정선을 이용하여 서로 다른 조건에서 마찰력을 측정하여 다음의 결과를 얻었다. 1.브라켓의 종류에 따른 마찰력의 차이는 Polycrystalline 세라믹 브라켓인 Allure의 평균 마찰력이 가장 높게 나타났고, 세라믹과 합성된 플라스틱 브라켓인 Vogue, 금속 브라켓인 Mini-Twin, 금속 슬롯을 갖는 플라스틱 브라켓인 Elan, monocrystalline 세라믹 브라켓인 Staflre, single 브라켓인 Lewis/Lang, 자가결찰 브라켓인 SPEED의 순으로 감소하였으며, frictionless브라켓인 Shoulder의 평균 마찰력이 가장 낮았다. 자가결찰 브라켓은 원형 교정선에서는 낮은 마찰력을 나타냈고, 사각형 교정선에서는 높은 마찰력을 나타냈다. 2.교정선 재질에 따른 평균마찰력은 스테인레스 스틸 교정선이 다른 교정선들에 비해 통계학적으로 유의하게 낮았으며, NiTi 교정선, Cu-NiTi 교정선 순으로 평균 마찰력이 높았다. 교정선의 형태에 따른 마찰력은 원형 교정선의 평균마찰력이 각형 교정선보다 낮았다. 3.본 연구에서 스테인레스 강으로 결찰했을 때의 평균마찰력이 탄성모듈로 결찰했을 때에 비해 모든 조건에서 통계학 적으로 유의하게 높았다. 4.건조환경에서의 금속 브라켓에 스테인레스 스틸 교정선, NiTi교정선 및 Cu-NiTi교정선의 평균마찰력은 타액환경에서보다 유의하게 낮았다. 5.브라켓간 offset이 증가함에 따라 평균마찰력은 유의하게 증가하였다. 6.브라켓간 거리의 변화에 대한 마찰력의 차이는 교정선의 재질에 따라 차이가 나며, 스테인레스 스틸 교정선은 브라켓간 거리가 감소할 때 마찰력이 유의하게 변화하지 않았으나, NiTi 교정선의 경우는 유의하게 증가하였다. 7.브라켓내의 교정선의 이동속도에 따라 마찰력은 유의하게 변화하지 않았다. 이상의 결과로 볼 때 교정 치료동안 적정 교정력을 유지하기 위해 자가결찰 브라켓, 스테인레스 스틸 교정선과 탄성모듈결찰법을 사용하는 것이 유리하며, 치료시기에 따라서 요구하는 마찰력이 다르므로 상황에 따라 재료를 선택하는 것이 중요할 것으로 사료된다. The purpose of this study was to amount of the frictional forces with the brackets and wires, ligation methods, dry/wet, offsets, interbracket distances, velocity and to compare them each other by different conditions. This study tested 0.018" x 0.025" slot sized 8 types of orthodontic bracket systems and 0.016", 0.016" x 0.022" sized stainless steel, NiTi, Cu-NiTi orthodontic wires. One cuspid bracket were positioned on the slide glass and archwire was engaged into bracket and ligated with elastomeric modules. The values of frictional forces were measured with the Instron universal testing machine. The results were as follows; 1.Polycrystalline ceramic bracket had the highest mean frictional forces and followed and by ceramic reinforced plastic bracket metal bracket, plastic bracket with metal slot, monocrystalline ceramic bracket, single bracket, self-ligating bracket. friction free bracket in descending order. The self-ligating bracket showed low frictional forces in the round wires and high frictional forces in the rectangular wires. 2.Stainless steel wires had the least frictional forces and followed by NiTi, Cu-NiTi wires in descending order. Round wires had lower frictional forces then that of rectangular wires. 3.The stainless steel ligation method had significantly greater mean frictional forces them the elastomeric module ligation method. 4.Artificial saliva statistically increased the frictional forces in stainless steel wire, NiTi wire and Cu-NiTi wire. 5.There was a statistically significant difference with offset change. 6.There was no statistically significant difference with interbracket distance in stainless steel wires but a significant difference in NiTi wires as the interbracket was decreased. 7.There was no statistically significant difference with velocity change. From the above findings, self-ligating bracket, stainless steel wires and the elastomeric module ligation method might be effective than any other materials to reduce the frictional forces in the orthodontic treatment and can be correlated to clinical situations seen in orthodontic patient care.

      • WO₃계 NO_(x)센서의 검지 특성과 바인더 첨가 효과

        양종인,한상도,김일진,손영목,임한조 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

        The effects of various binderssuch as PVA, silica sol and alumina on the sensing characteristics of TiO_(2) (4 wt. %)-doped WO_(3)-based NO_(x). sensors were investigated. The sensor with PVA (polyvinyl alcohol) binder showed an improved sensitivity (R_(gas)/R_(air)- in NO_(x) 15 ppm = 375), response time and cross-sensitivity (selectivity) for interference gases (CO, SO_(2), CH_(4), C_(3)H_(8)). It could also be operated at a lower consumption power (about 1.6W at 180℃). The sensors with silica sol and alumina binders showed a decreased sensitivity (R_(gas)/R_(air) in NO_(x) 15 ppm = 63 and 31, respectively) for NO_(x) gas sensing, but they showed an improved cross-sensitivity, response and recovery time (1 -2 min. and 1 min., respectively) than the sensor fabricated without binder.

      • 工場勤勞者들의 肺容積 및 肺換氣能에 關한 硏究

        金鍾穆 충남대학교 의과대학 지역사회의학연구소 1979 충남의대잡지 Vol.6 No.2

        This study was attempted to evaluate the effect of the working environment on the health of labors, especially their lung volumes and pulmonary functions. For this investigation, 469 labors(356 male and 113 female) working in several factories in Taejeon area, were randomly selected as an experimental group and 142 healthy normal adults (86 male and 56 female) as a control group. The experimental and control groups were devided into three age-subgroups in male and two age-subgroups in female, respectively. The measurement was made on the vital capacity(VC), maximum voluntary ventilation (MVV), maximum mid-expiratory flow(MMF) and forced expiratory volume(FEV_T) by means of spirometry. As the measurement, careful efforts were made on reducing errors by asking the subjects for their cooperation with the investigator. Each measurement was made in the standing position of the subjects, and the heighest values were taken after three repeated procedures in each manuever. All the measured values were subsequently converted into BTPS condition. The results are summarized as follows : 1. The physical characteristics of the experimental groups showed no significant differences with those of the control group. 2. The vital capacity of the male experimental groups and the ratio of vital capacity of the female experimental groups to their weight and height were significantly lowered than those of each control group. 3. The values of maximum voluntary ventilation of all experimental groups in both sexes showed lower than those of each control group. Especially, the ratio of the vital capacity to the weight in male, and to the weight and body surface area in female presented significant differences, respectively. 4. The values of maximum mid-expiratory flow of the each experimental group in .male, and its ratio of the maximum mid-expiratory flow of the female experimental groups to their weight were significantly lower than those of each control group. 5. The forced. expiratory volumes of the experimental groups in male, and at 0.5sec in female experimental groups were significantly lower than those of each control group. 6. The ratio of the forced expiratory volumes to the vital capacity at 1.0sec in male, and at 0.5 and 1.0sec in female experimental groups were significantly lower than those of each control group. From the above results, it is suggested that the industrial labors with the decreased lung volume and increased airway resistance may be due to some factors in the working environment.

      • 龜何歌의 儀式構造內的 意味 : 歲時儀式과의 관련을 중심으로

        柳鍾穆 東亞大學校 1992 東亞論叢 Vol.29 No.1

        The Purpuse of this study was to analyze the internal meaning of 'KWIHAGA' in ceremonial struc-ture, which was compared with King Suro's enthronement seremony to 'CHISINPAPKI' (stepping the God of the earth). The findings in this study can be concluded as followes. 1. The procedure of CHISINPAPKI which werl composed of coming down the God, greeting the God, main ceremony, and the final ceremony was mached with descending egg, greeting egg, growth part, and the enthroement part of king Suro's enthronement ceremony. 2. The parts of descending egg in King Suro's enthronement ceremony were analyged by 4 parts. 'KUL BONG JEOUNG CHAL TO' was found as the establishment of ceremonial altar and 'KWI-HAGA' was also understood as the cleansing of ceremonial altar area. 3. In order to establish the afuthority of nation King Suro emphasized to use the religious servise with enthronement ceremony. 4. Owing to the script of letter in Munjong period, the content of King Suro's myths which were transmitted by oral methods was changed very much.

      • 거주 형태에 따른 에너지 섭취량과 소비량의 균형도 조사

        박순목,고성경,남인수,윤재만,임승현,전중기,이종삼 대구대학교 인문과학연구소 2008 人文科學硏究 Vol.31 No.-

        We investigated that the effects of residential type on energy balance in college students. Total sixteen college students were participated in this study, all subjects were assigned one of three groups: either school attendee students group, self-governed living students group, dormitory students group. Routine physical activity level (for 5 days including three weekday and two weekend) and food intake were surveyed. For investigation of degree of physical activity, all subjects were requested to record on their physical movements as possible as detail should be obtained. To all subjects, five-day dietary log form was given, and used for examining of calorie intake from their routine diet. There was no statistical difference in energy intake and consumption in each. However energy consumption was significantly higher than energy uptake in school attendee students group. All other groups were shown a similar energy values between energy uptake and consumption. There were no significant differences in energy intake and consumption in any of experimental groups when comparisons were made between weekdays and weekend. As far as energy uptake was concerned it was no statistical difference in any of major nutrients among groups. In conclusion, partial imbalance was found between energy intake and uptake in school attendee groups. This may be due to their more active life style than other groups'. In future studies, better controlled study should be performed not only more subjects are recruited but also minor nutrients are included for examining of energy balance.

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