• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1999년도 춘계학술발표회요약집
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• pp.155-155
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• 1999

Pool boiling critical heat flux (CHF) have been investigated using plate type test sections with different widths (3 cm & 4 cm) and lengths (10 cm, IS cm & 20 cm) under various incli- nation angles. As the inclination angle increases from $0^{\circ}$ (horizontally facing downward plate) to $30^{\circ}$, CHF sharply increases. After that angle, CHF gradually increases with the increase of the inclination angle. There must be a transition angle between $0^{\circ}$ and $30^{\circ}$, at which the CHF increase rate remarkably changes. According to the comparison of present and previous ex- periments, the transition angle may be affected by heater size and increase with the increase of heater size. The size effect of heated surface on CHF is noticeable in the L15 & L20 series and W4 series; however, it seems to be difficult to find the size effect in L10 series and W3 series.

• 한국정밀공학회지
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• 제3권3호
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• pp.30-39
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• 1986

The burr worsens the accuracy of a workpiece and decreases a lot of pro- ductivity because it takes so much time and efforts to remove it. In this paper, the height, thickness and size of a drilling burr were derived from the drilling variables of drill diameter, chisel edge angle, web rate =($\Frac{2{\times}\;web\;thickness}{drill\;dia}$) and yielding stress of the workpiece as wel as feed, point angle and helix angle. The theoretical and experimental values of drilling thrust, torque and burr size of the testpiece were analyzed with the method of numerical analysis in a standard drilling condition. The order of choosing the drilling variables for the purpose of controlling the burr size was dealt in this paper with burr forming ratio. The results are as follows: (1) The drill diameter forms 42 percents feed 25 percents point angle 23 percents and web rate, chisel edge angle and gelix angle 5 percents of the partial differential slope of drilling thrust within the usual available ranges of drilling variables. (2) The drill diameter forms 55 percents feed 26 percents web rate 9 percents and chisel edge angle, point angle and helix angle 10 percents of the par- tial differential slope of drilling torque in the usual available ranges of drilling variables. (3) About 70 percents of the burr size can be controlled by feed, 29 percents by web rate in the case of a fixed diameter. It is recommended drilling10 variables to be chosen in the order of feed, web rate, drill diameter, point angle, chisel edge angle and helix angle so as to control the burr size effectively.

• 수산해양기술연구
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• 제44권4호
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• pp.273-281
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• 2008

In this study, the effect of slope length and angle at the entrance to fishing pots on the size of captured shrimp was examined to determine the optimal design of pots for use in Hokkaido, Japan. The purpose of the current study was to optimize the design of shrimp pots to allow greater control over the size of captured individuals for the purposes of shrimp resource management. Tank experiments were conducted to determine the optimal slope length and slope angle by analyzing the sizes of shrimp entering 10 model pots with combinations of five different slope lengths on slope angle of current shrimp pot, and five different angles on slope length of current shrimp pot. The results showed that, as the slope length of the pot increased, the size of individuals which entered the pot increased. In addition, as the slope angle was elevated in each of the five different slope angle treatments, the size of individuals entering was also increased.

• 복식
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• 제49권
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• pp.25-48
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• 1999

The purpose of this study is to offer fundamental data for classification of somatotype for boys of elementary school age. The subject were 458 elementary school boys aged from 7 to 12 living in Pusan, Data were collected by 57 anthropometric and 11 photographic measurements and analyzed by factor analysis according to SAS package 1. Through the factor analysis by each period of school ages 6-7 factor were obtained in upper half and they are as followings: 1) Factor 1 is horizontal size of upper half in every period 2) Factor 2 is vertical size of upper half in every period 3) Factor 3 is shoulder shape in the first period and length of upper half in the middle and latter period 4) Facto 4 sis length of upper half in the first period and shoulder shape in the middle and latter period 5) Factor 5 is angle shape of the breast and back in the first period angle shape of the lower breast and back in the middle of period and angle shape of the upper breast and back in the latter of period 6) Factor 6 is angle of shoulder in the first period angle shape of the upper breast and back in the middle of period and angle shape of the lower breast and back in the latter of period 7)Factor 7 is angle of shoulder in the latter of period 2. Through the factor analysis by each period of school ages 5-6 factor were obtained in lower half and they are as followings: 1) factor 1 is horizontal size of upper half in every period 2) Factor 2 is vertical size of upper half in every period 3) Pactor 3 is angle shape of the belly and upper buttock in the first period and length of lower half in the middle and latter period 5) Factor 5 is angle shape of the lower buttock in the first period angle shape of the upper belly and buttock in the middle of period and angle of the side posture in the latter of period 6) Factor 6 is angle shape of the lower buttock in the middle of period and angle shape of the lower belly and buttock

• 한국의류학회지
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• 제18권5호
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• pp.637-645
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• 1994

The purpose of this study was to analyze the characteristics of men's foot and the foot type by cluster analysis for men's footwear. The sample size for the study was 200 college men between age 19 and 24 in Pusan urban area. There were measured 17 items of the foot for factor analysis and cluster analysis. The result was as follows: 1. The size of If items of men's foot is larger than women's foot. 2. There were 9 items selected by factor analysis. 3. The cluster analysis of the direct measurement: Cluster 1: The items of the direct measurement is all much the same to mean value of this age group. Cluster 2: The foot size is relatively small to other clusters. Cluster 3: The foot size is relatively large to other clusters. 4. The cluster analysis of indirect measurement: Cluster 1: The foot print angle is the most value and Metatarso-Phalanx angle is nomral Cluster 2: The foot print angle is middle and Metatarso-Phalanx angle is normal. Cluster 3: The foot print angle is high and Metatarso-Phalanx angle is the smallest. Cluster 4: The foot print angle is low and Metatarso-Phalanx angle is all the much same to mean value of this age group.

• Tribology and Lubricants
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• 제27권1호
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• pp.34-39
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• 2011

In this study, finite element analysis of particle-surface collision using 2-dimensional elements was performed to observe the effects of abrasive size and impact angle. The result of the simulation on the change in abrasive size revealed that larger abrasive particle induced larger contact stress due to force transfer through slurry fluid as the particle moved and pushed the fluid. This observation brought an important finding that the slurry fluid could make the workpiece surface soften and then change the mechanical properties of the surface layer such as elastic modulus and yield strength. As for the impact angle, it was found that the contact stress increased with the angle of impact and jumped up at a specific angle. Such result would be attributed to the complex effects of the impact velocity and angle.

• Elastomers and Composites
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• 제56권1호
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• pp.12-19
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• 2021

The abrasion behaviors of NR/BR blend vulcanizates were investigated using NR/BR = 100/0, 80/20, and 60/40 compounds. The abrasion test was performed using a laboratory abrasion tester (LAT) at slip angles of 1° and 7°. The size distributions of the wear particles and the abrasion rates were examined according to the rubber compositions and slip angles. The most abundant wear particles at the slip angle of 1° were sizes above 1,000 ㎛, irrespective of the rubber composition. The most abundant wear particles at 7° slip angle had sizes in the range of 212-500 ㎛, except for the NR = 100 sample. The wear particle size distribution shifted to a smaller size as the slip angle and BR content increased. The abrasion rate at 7° was much larger than that at 1° slip angle. Furthermore, the abrasion rate was notably increased by adding BR to NR.

• 대한치과교정학회지
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• 제37권3호
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• pp.192-203
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• 2007

본 연구는 비폐쇄를 보이는 III급 부정교합아동에서, 기도 공간의 형태와 안모 골격 형태 사이의 상관관계를 평가하였다. III급 부정교합을 보이며, 비폐쇄 소견을 보여 이비인후과로 의뢰된 환아 100명의 초진 측모 두부 규격 방사선 사진에서 상 인두기도 공간(upper PAS), 하 인두기도 공간(lower PAS), 편도의 크기, 구개-혀 공간을 측정하여 기도 공간 형태를 분석하였으며, 통상적인 계측점을 사용하여 안면 골격 분석을 시행하여 기도 공간 형태 계측항목과 안면 골격분성 항목간의 상관관계를 연구하여 다음과 같은 결과를 얻었다. Upper PAS는 ramal height, SNA, SNB, PFH, FHR, facial plane angle 항목과 양의 상관관계를 보였으며, saddle angle, articular angle, gonial angle의 sum, SN-GoGn, Y-axis to SN, FMA 항목과 음의 상관관계를 보였다. Lower PAS는 genial angle, FMA와 양의 상관관계를 보였으며, articular angle, facial depth, PFH, FHR와 음의 상관관계를 보였다. 편도의 크기는 PCBL, ramal height, Mn. body length, Mn. body length to ACBL, facial depth, facial length, PFH, AFH와 양의 상관관계를 보였다. 구개-혀 공간은 saddle angle, articular angle, genial angle의 합, facial length, AFH, FMA, LFH와 양의 상관관계를 보였으며, IMPA, overbite와 음의 상관관계를 보였다.

• 대한수학교육학회지:학교수학
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• 제12권1호
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• pp.45-60
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• 2010

학교수학에서 '각도'는 용어로서의 실효성을 상실한 반면에, '각의 크기' 라는 표현이 우세한 만큼, 그 표현의 수용을 고려할 필요가 있다. 교과서에서 각의 크기는 변의 길이와 관계없이 두 변이 벌어진 정도에 따라 다르다는 것을 명시할 필요가 있다. 해설서의 내용과 교과서의 내용을 일치시켜야 한다. 교과서에서는 각의 크기를 측정하기 위한 임의단위를 취급하지 않는다. 임의단위에 의한 각의 크기의 측정을 생각할 수는 있지만, 그것이 그다지 행해지지 않는다는 실정을 받아들여, 해설서에서 그것을 요구하지 않는 것을 고려할 필요가 있다. 해설서에서 1직각의 표준단위로서의 역할을 명시할 필요가 있고, 교과서에서도 그것을 활용하는 장면을 제시해야 한다. 교과서에서는 삼각형의 세 각의 크기의 합을 구하는 과정과 사각형의 네 각의 크기의 합을 구하기 위해 삼각형과 사각형을 각각 잘라 붙이는 과정에서, 학생들이 크기가 180도인 각과 360도인 각이 그림으로 어떻게 표현될 수 있는지 알고 있다는 것을 전제로 하고 있다. 그것은 비약이다.

• 대한가정학회지
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• 제29권3호
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• pp.23-34
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• 1991

With 10 subjects of 6-year-old children residing in Pusan, I analyzed the relation of walking types(step angle, step width, step and stride) and wear comfort according to the style and size fo shoes in order to reveal the fitness of children's shoes centered on the relationship of shoes size and walking. Three styles of children's shoes(laced and unlaced formal shoes, magic-taped sports shoes) ranging in five different size were used. The following are conclusions. 1. As to step angle, there was no conceivable change in the left side, while the right side had a significance in accordance with the shoes size at p<0.001. As the size grew, right step angle of all shoes increased, with unlaced shoes having more influence than others. Step angle were the smallest when all the sampled shoes made the difference of 5mm between foot size and shoes size. 2. As to step width, there was no conceivable change in the style of shoes, while shoes size had a significance at p<0.001. As the size grew, step width also increased. Step width were the smallest when all the sampled shoes made the difference of 5mm between foot size and shoes size. 3. Step and stride, however, took no significance at all, since they were not influenced by the size or style of the shoes. 4. Wear comfort had a significance at the level of p<0.001. Since it was influenced by the size or style of the shoes. The best wear comfort was felt when all the sampled shoes had laces and magic tapes as well as the size with the difference of 5-10mm between foot size and shoes size.