• 대한치과기공학회지
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• 제2권1호
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• pp.25-27
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• 1980

In the process of arranging artificial teeth the simple atracing technique was shown to be more precise and convenient for general use in dental clinic than gothic arch tracing. The simple tracing technique had some advantages over other ones in that they were very useful to check protrusive, lateral and central occlusion of mandible movement, and it was very easy to transfer the oral condition and mandible movements precisely onto the articulator. Also the technique was more effective than when using wax bite in that the functional movement range has shifted to 0.2 - 0.4mm form central occlusion.

• 한국치위생학회지
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• 제20권1호
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• pp.11-18
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• 2020

Objectives: We analyzed the correlation between physique and size of the dental arch of college students with normal occlusion. Methods: Ninety-nine college students filled out the prepared questionnaire. The length and width of the dental arch of the students was measured using a plaster model after taking an impression. The data were analyzed using the t-test and correlational analysis. Results: The maxilla arch length was 3.70 mm longer and the inter-molar width of the maxilla was 3.06 mm longer in men (both p<0.01) than in women. Additionally, the mandible was 3.66 mm longer in men as compared to those in the women (p<0.01). As height increased, there was increase in the body weight (α=0.683, p<0.01), maxilla arch length (α=0.373, p<0.01), molar width of the maxilla (α=0.214, p<0.05), and the mandible (α=0.280, p<0.01). The greater the weight increase, the greater the maxillary arch length increase (α=0.392, p<0.01), and the greater the molar width of the maxilla (α=0.336, p<0.01) and mandible (α=0.502, p<0.01) increase. Conclusions: As physical size (both height and weight) increased, the maxillary length and molar width also increased. Based on the results of this study, the cause of malocclusion, form and size of the dental arch, and stable occlusion can be used as basic data.

• Structural Engineering and Mechanics
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• 제63권6호
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• pp.799-808
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• 2017

Failure of a redundant long-span bridge is often described by innumerable failure modes, which make the structural system reliability analysis become a computationally intractable work. In this paper, an innovative procedure is proposed to efficiently identify the dominant failure modes and quantify the structural reliability for a long-span bridge system. The procedure is programmed by ANSYS and MATLAB. Considering the correlation between failure paths, a new branch and bound operation criteria is applied to the traditional stage critical strength branch and bound algorithm. Computational effort can be saved by ignoring the redundant failure paths as early as possible. The reliability of dominant failure mode is computed by FORM, since the limit state function of failure mode can be expressed by the final stage critical strength. PNET method and FORM for system are suggested to be the suitable calculation method for the bridge system reliability. By applying the procedure to a CFST arch bridge, the proposed method is demonstrated suitable to the system reliability analysis for long-span bridge structure.

• 대한치과교정학회:학술대회논문집
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• 대한치과교정학회 2003년도 제36회 학술대회
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• pp.29.2-29.2
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• 2003

• Journal of Chest Surgery
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• 제33권9호
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• pp.748-751
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• 2000

The diffuse form of supravalvar aortic stenosis represents a surgical challenge when the ascending aorta, aortic arch, proximal descending thoracic aorta and arch arteries are involved. It can be treated by a variety of surgical approaches. We report a case of severe diffuse supravalvar aortic stenosis combined with an aortic valve anomaly and occlusion of the right coronary artery ostium in a 14-year-old boy with Williams syndrome. We enlarged the aortic root(Nick's procedure), ascending aorta, aortic arch, proximal descending thoracic aorta, and innominate artery with patches and replaced aortic valve with 19 mm St. Jude valve. Deep hypothermic circulatory arrest and retrograde cerebral perfusion were used during repair of the arch and arch artery.

• 대한치과교정학회지
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• 제14권2호
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• pp.249-261
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• 1984

This study was to investigate the fitness of the dental arch line to the parabola, and to estimate correlation between the parabola and some ratios of the dental arch measurements. The sample was consisted of the 64 plaster casts showing normal occlusion which was taken from males and females of Korea, aging from 15 to 18 years. The photos of occlusal surface of the plaster casts were taken, and 38 landmarks on the film were selected. The 3 dental arch lines on each dental arch were imaged. One is the dental arch line passing the points of the most buccal surfaces of the teeth, another is that passing the buccal cusp tips of the posterior teeth and the incisal edges, and the other is that passing the midpoints of the teeth. The landmarks on the film were digitized, and measurements and statistics were performed by the IBM computer. The results were as follows; 1. The fitness of the dental arch to the parabola was very good. The fitness of thor upper dental arch was above $91\%$, and that of the lower dental arch was $93\%$. 2. The dental arch line passing the points of the most buccal surfaces of teeth was best fit to the parabola, the buccal cusp tip arch line and the midpoint arch line in order. 3. Correlation between the ratio of oblique molar dental height to molar width and the parabola was very high. 4. The ratio of oblique molar dental height to molar width was devided into 4 groups by the quartiles, and mean parabolic equations and curves were calculated and drawn.

• 대한치과교정학회지
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• 제3권1호
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• pp.7-13
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• 1972

정상 치열궁에 관한 연구는 많은 학자들에 의해 시행되어온 바 학자들 간에는 아무런 일관성이 없다는 의견과 치열궁을 대표할 만한 기하학적 곡선이 존재한다는 의견이 상충되어 왔다. 그중 후자의 이론이 지배적인 것으로 보이나 그 중에서도 곡선의 형태에 관하여서는 다시 많은 논란이 있었다. Bonwill과 Hawley등에 의한 Circle론, Black의 반타원론, Angle의 포물선론, 이외에도 많은 의견이 있는 가운데 저자는 정상교합을 유지하는 한국인 성인을 대상으로 Bonwill과 Hawley의 이론을 기초로 한 연구를 시행한 바 다음과 같은 결과를 얻었다. 1. 정상교합을 유지하는 한국인 성인의 치열은 전치에 있어서 원호에 근사한 배열을 갖는다. 2. 원의 지름은 6전치의 폭경의 합에 대하여 다양하므로, 전치 배열이 치아의 크기에 엄격히 연관됐다고 단정 할 수는 없다. 3. 그러나 6전치 폭경의 합에 대한 원의 지름의 비율은 그 평균치가 상하악 모두 1 : 1에 매우 근접하고 이 사실은 Bonwill의 결론에 부합한다. 4. 견치간 폭경과 구치간 폭경은 육전치의 합에 대한 비율이 상하악에 있어서 그 형태가 다름에 따라 상이하나 비교적 일정하게 나타난다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2015년도 전력전자학술대회 논문집
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• pp.13-14
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• 2015

This study has conducted a computational analysis to find out about characteristics of heat flow emitted from power lines when the sectional form of electric power tunnel that adopts forced ventilation is shaped like a rectangular, arch or horseshoe. The result of analysis shows that the temperature in the vicinity of the power line peaked at $70^{\circ}C$ when the sectional form is a rectangular, which indicates it is less affected by ventilation than the form of an arch or horseshoe.

• Structural Engineering and Mechanics
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• 제22권3호
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• pp.351-370
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• 2006

In this study, the earthquake damage response of the concrete arch dams was investigated including dam-reservoir interaction. A continuum damage model which is a second-order tensor and includes the strain softening behavior was selected for the concrete material. Fluid-structure interaction problem was modeled by Lagrangian approach. Sommerfeld radiation condition was applied to the truncated boundary of reservoir. The improved form of the HHT-${\alpha}$ time integration algorithm was used in the solution of the equations of motion. The arch dam Type 5 was selected for numerical application. For the dynamic input, acceleration records of the 10 December 1967 Koyna earthquake were chosen. These records were scaled with earthquake acceleration scale factor (EASF) and then used in the analyses. Solutions were obtained for empty and full reservoir cases. The effects of EASF and damping ratio on the response of the dam were studied.

• 대한치과의사협회지
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• 제57권6호
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• pp.344-351
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• 2019

Skeletal Class III malocclusion is a relatively common form of malocclusion in Korea. In borderline cases where only mild skeletal discrepancy exists and if worsening of the facial profile is expected as a result of premolar extraction, mandibular full arch distalization with miniscrews is the treatment of choice. The purpose of this study was to investigate the pattern of tooth movement and evaluate the stability of mandibular full arch distalization and to identify correlation between stability and factors such as initial skeletal pattern, dental changes during treatment and alveolar bone in symphysis region using lateral cephalograms.