• 한국수학교육학회지시리즈E:수학교육논문집
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• 제33권3호
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• pp.295-317
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• 2019

각 개념은 교육과정 전반에 걸쳐 나타나는 개념이며, 기하 단원에서 기본적인 개념이다. 각은 다면적인 성격을 갖고 있으며 이후 학습에 영향을 주므로 학생들이 다양한 각 개념을 이해하는 것이 필요하다. 본 연구에서는 싱가포르, 영국, 호주, 미국을 비교 대상국가로 정하여 교육과정에서 나타나는 각 관련 내용 요소와 학습시기를 전체적으로 살펴 본 뒤 각에 대한 관점과 각의 크기 측면을 상세하게 살펴보고 이를 바탕으로 우리나라 교육과정에 시사점을 주고자 한다. 분석 결과 우리나라를 제외한 4개국은 보각, 여각, 직선 위의 각, 한 점에서의 각, 각도 구하기를 교육과정에 명시하여 다루고 있으며, 특정 학년에서 집중적으로 각 관련 내용을 학습하는 우리나라에 비해 대부분의 국가가 여러 학년에 걸쳐 점진적으로 각 관련 내용을 다루고 있었다. 대부분의 국가가 각의 정의는 정적인 관점에서, 각의 크기는 동적인 관점에서 서술하고 있었으며, 동적인 관점을 초등학교에서 도입하는 다른 국가에 비해 우리나라는 비교적 늦은 중학교에서 동적인 관점이 처음으로 나타났다. 교육과정에서 다루는 각의 크기의 범위는 우리나라가 다른 국가보다 좁았다. 이를 통해 우리나라 교육과정에 각의 성질과 관련된 다양한 내용 요소를 어떻게 배치하고 전개해 나갈지 논의할 것, 각의 다면적인 성격을 고려하여 정적인 관점뿐만 아니라 동적인 관점을 모두 활용하여 각을 다룰 것, 회전량으로서 각의 크기를 도입하여 우각 및 $180^{\circ}$, $360^{\circ}$ 크기의 각을 학습할 것을 제안한다.

• 대한기계학회논문집
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• 제15권1호
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• pp.139-144
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• 1991

본 연구에서는 절삭가공시 생성되는 칩의 형상해석의 일환으로 2차원 절삭시 칩은 절삭날에 수직한 방향으로 공구경사면을 흘러간다는 기본적인 전제조건과 Kluft 등의 칩흐름각 예측에 대한 제안중 노으즈반경(nose radius) 및 기울임각의 영향을 중 첩시키고, 또한 절삭날에 연하여 미변형 칩두께(undeformed chip thickness)가 달라지 는 경우 칩흐름의 세기는 이에 비례한다는 Baart등의 가정을 도입하여 칩흐름각에 대 한 새로운 해석을 시도하였다.

• 대한치과교정학회지
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• 제8권1호
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• pp.27-37
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• 1978

In order to know the variation of the associated craniofacial skeletal angle and linear distance according to the change of gonial angle, the roentgenographic cephalo metric study was undertaken in Korean normal cephalometric analysis and eletric computer. The fallowing results were optained. 1) The size of gonial angle is mainly depend on the lower gonial angle. The mean of upper gonial gngle is almost same in normal occlusion group$^*$ and malocclusion group. 2) It was resulted on normal group and malocclusion group by F test that the number of parameters that were significant at 5% level of confidence were 14 parameters in normal occlusion group and 22 parameters in malocclusion group. 3) Ramus height and mandibular body length increased and facial ratio is decreased as gonial angle decreased. 4) MP-T, overbite depth and Y-axis angle is not related to gonial angle in normal occlusion group, but in moloclusion group, as gonial angle decreased, MP-T and overbite depth is increased and Y-axis angle is decreased. 5) SN-MP, OP-MP, PP-MP is increased as gonial anglel increased, it was mainly depend on the lower gonial angle.

• International Journal of Precision Engineering and Manufacturing
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• 제8권3호
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• pp.20-23
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• 2007

To calibrate precision autocollimators, the Korean Research Institute of Standards and Science (KRISS) has built a small angle generator using a laser interferometer. The system is based on a sine bar mechanism in which the angle is determined from the ratio of two lengths. The rotational angle is measured by the angle interferometer and the heterodyne laser interferometer detects the relative displacement of two retro-reflectors attached to the rotating arm. The distance between the two retro-reflectors of the laser angle interferometer is self-calibrated by an index table positioned on the rotating arm. The resolution of the system is 0.002 seconds, and the accuracy is better than 0.04 seconds within a measuring range of $\pm$1 degree. The small angle generator can also be used with an index table that can divide one circle into 1440 angles. The combined system can generate any angle over 360 degrees to an accuracy of 0.11 seconds.

• International Journal of Ocean System Engineering
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• 제1권1호
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• pp.9-15
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• 2011

This study examined the relationship between the scarf angle and stress distribution, and estimated the strength recovery via a finite element analysis. The following conclusions were drawn from this study. Resin will fracture due to a tensile load with a high scarf angle, which is similar to the patch repair method. An applied stress can be loaded to a repaired laminate if the scarf angle is $5^{\circ}$. The Von-Mises stress increases with decreasing scarf angle, with the exception of a scarf angle of $30^{\circ}$, where the scarf angle can indicate the rates of shear and normal stresses. Strength recovery can be better if the scarf angle is decreased to a lower angle. However, scarf machining requires more time, a high skill level and considerable expense. Therefore, a scarf angle of $5^{\circ}$ is the most effective for a repair. These results may provide a guide for engineers wishing to formulate a standard for repair. The scarf angle needs to be carefully managed for a more efficient composite repair.

• The Journal of Korean Physical Therapy
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• 제16권1호
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• pp.14-31
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• 2004

The Purpose of this study was to investigate the change of lumbar extensor strength according to lumbosacral angle on chronic lumbar back pain patients. For this investigation lumbar extensor strength was administered to 60 patients who were diagnosed chronic lumbar back pain The subjects was to investigate lumbosacral angle in standing position and it were calculated lumbar extensor strength by using Medex. The result of this study summarized are as follows ; 1. Total experimental group exhibited significantly higher difference than control group in lumbar extensor strength among all degree lumbosacral angle. 2. In the relationship between experimental group and control group in lumbar extensor strength among lumbosacral angle, all degree difference was revealed II, I, III order. 3. In the relationship between experimental group and control group in lumbar extensor strength among lumbosacral angle, I group difference was did not. 4. In the relationship between experimental group and control group in lumbar extensor strength among lumbosacral angle, all degree among II group was noted significantly difference except 24, 72 angle. 5. In the relationship between experimental group and control group in lumbar extensor strength among lumbosacral angle, control group was revealed higher muscle strength 48, 60, 72 angle, however no significantly difference was noted 0, 12, 24 angle. The study was objected difference of other group in both of experimental and control group. Because lumbar extensor weakness with bad position was gradually increased back pain, to Maintain normal lumbosacral angle befor exercising lumbar extensor strength was most important.

• 한국항공우주학회지
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• 제47권7호
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• pp.508-516
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• 2019

본 논문은 이동표적에 대해서 고정형 탐색기(Strapdown Seeker)가 장착된 유도탄의 지향각 제한을 고려하여 충돌각(Impact Angle)을 제어하는 유도법칙을 제안하고 있다. 제안한 유도법칙은 슬라이딩 모드를 기반으로 하고 있으며, 탐색기에서 제공하는 지향각과 항법 정보를 통해 얻을 수 있는 시선각 정보와 발사 초기 표적 획득장비 등을 통해 제공 받는 표적 속도와 표적 이동경로각을 이용하여 가속도 명령을 생성한다. 제안한 슬라이딩 surface의 수렴을 통해 표적 요격과 충돌각 제어가 가능하다. 또한, 최대, 최소 지향각에서 지향각의 미분결과의 부호가 지향각의 부호와 반대가 된다는 것을 보임으로써 지향각 제한을 넘지 않는다는 것을 확인할 수 있다.

• PNF and Movement
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• 제17권2호
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• pp.329-337
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• 2019

Purpose: Ultrasound imaging is commonly used to measure the pennation angle of human skeletal muscles in vivo. However, manual assessment of the pennation angle using ultrasound images is subjective and time-consuming and requires a high level of examiner skill. The architectural analysis of human skeletal muscles is thus challenging. Automated approaches using image processing techniques are therefore required to estimate the pennation angle in ultrasound images. The purpose of this study was thus to assess the intra-tester and inter-tester reliability and validity of the pennation angle using an automatic measurement program. Methods: Twenty-two healthy young adults (mean age = 22.55 years) with no medical history of neurological or musculoskeletal disorders voluntarily participated in this study. Ultrasound imaging was used to measure the pennation angle of the gastrocnemius muscle at rest. One examiner acquired images from all the participants. The intra-tester and inter-tester reliability were evaluated using the intraclass correlation coefficient (ICC) to estimate reliability. Validity was measured using Pearson's correlation coefficient. Results: The intra-rater reliability was excellent for the automatic pennation angle measuring program and the manual pennation angle assessment method (ICC>0.95). The inter-rater reliability was also excellent for both methods (ICC>0.93). All the correlation coefficients for the automatic pennation angle measuring program and the manual pennation angle assessment method were 0.79, which indicated a significantly positive correlation (p<0.05). Conclusion: Pennation angle measurement using the automatic pennation angle measuring program showed acceptable reliability and validity. This study therefore demonstrated that the automatic measuring program was able to automatically measure the pennation angle of skeletal muscles using ultrasound images, and thus made it easy to investigate skeletal muscle architecture.

• 한국측량학회지
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• 제10권2호
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• pp.45-48
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• 1992

水平角 觀測에 있어서 測準誤差는 測角値의 精度에 큰 影響을 미친다. 名 測定距離에 따라 個個의 測角値에 이 測準誤差를 考慮한 값이 正確한가를 考察하기 위하여 三邊測量을 遂行하였다. 따라서, 本 硏究에서는 邊長에 의해 計算한 正確한 값과 實測角과의 比較를 통하여 測角誤差를 檢討하였다.

• 대한치과교정학회지
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• 제14권2호
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• pp.233-239
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• 1984

The author studied on the tongue position, tongue space and intermaxillary space at 4 groups; normal occlusion 30 cases, Angle's Class I bimaxillary protrusion 29 cases, Angle's Class II malocclusion 26 cases, Angle's Class III malocclusion 26 cases. This study used the data from cephalometric films of female subject aged from 16 to 23 years. Following results were obtained; 1. Dorsal height in Angle's Class III malocclusion was greater than normal occlusion. 2. Anterior Intermaxillary Height in Angle's Class I bimaxillary protrusion and Angle's Class III malocclusion was greater than normal occlusion. 3. Tongue space in Angle's Class I bimaxillary protrusion was greater than normal occlusion. 4. The ratio of the tongue space to the intermaxillary space (T.S./I.S.) in Angle's Class II malocclusion was greater and the ratio in Angle's Class III malocclusion is lesser than normal occlusion.