• 한국임상수의학회:학술대회논문집
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• 한국임상수의학회 2007년도 춘계학술대회
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• pp.138-138
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• 2007

• Journal of Oral Medicine and Pain
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• 제6권1호
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• pp.35-44
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• 1981

This study was undertaken to investigate the values of Gonial angle of the aged from 50 to 87 which consisted of 75 males and 47 females and the other values of the cephalometric standards of the aged which consisted of 42 males and 26 females with normal occlusion and acceptable profile. Each lateral cephalometric head films were taken with the teeth in occlusion utilizing the Siemens Cephalometer. The following conclusions were obtained : 1. The author made the tables of standard deviation from the measured values. 2. The degree of the Gonial angel of the aged was larger than that of Korean adults. 3. The degree of length in the values of the cephalometric standards of old aged men was larger than that of women.

• 한국통신학회논문지
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• 제30권8C호
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• pp.769-774
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• 2005

무선 이동통신 환경에서 몇 가지 까닭으로 말미암아 신호의 도래각이 통계적으로 퍼지게 될 때, 점신호원 모형대신 이러한 환경에 적합한 새로운 모형이 필요하다. 이 논문에서는 새로운 각 퍼짐 신호원 모형을 제안하고, 그 모형 아래에서 고유값 분해기법에 기초한 신호 도래각 추정방법을 제안할 것이다. 추정 에러의 근사적인 분포는 통계적 특성을 통해 알 수 있다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
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• pp.1154-1157
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• 2004

During normal machine operation, partial discharge(PD) measurements were performed with turbine generator analyzer(TGA) in imitation stator winding of high voltage motors. The motor was energized to 4.47kV, 6.67, respectively. Applied voltage to Imitation winding was used two voltage level, 4.47[KV]and 6.67[KV]. Motors having imitation stator winding were installed with 80pF capacitive couplers at the terminal box Case of PD Pattern regarding applied voltage phase angel, the PD patterns were displayed two dimensional and three dimensional. TGA summarizes each plot with two quantities such as the normalized quantity number(NQN) and the peak PD magnitude(Qm). As the result, we could discrimidate using TGA the difference of internal and surface discharge for imitation stator winding. We have used the other technique, in order to feature extraction of faulty signals on stator winding, Daubechies Discrete wavelet transform and Harmonics analysis(FFT) about faulty signals.

• 한국공간구조학회논문집
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• 제13권3호
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• pp.65-72
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• 2013

Long span arch structure is composed of arch as relatively flexible structure and column as relatively rigid structure. In this study, the characteristic of dynamic response is analyzed according to the natural frequency ratio between arch and columns. The result of analysis for arch as relatively vertical vibration mode is dominant, the influence of columns mainly appears at relatively high frequency band according to increase of 1st mode frequency in column. However, the dynamic characteristic of arch structure is expected to vary with not only frequency ratio but interaction between vibration modes of arch and columns.

• Journal of Advanced Marine Engineering and Technology
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• 제18권3호
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• pp.63-67
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• 1994

A main property for fiber reinforced thermoplastic composite material in compression molding is the flow of fibers. This flow is so effective a long direction of acting force that this study examined for the inclined angel of 30$^{\circ}$, 45$^{\circ}$ and 6$^{\circ}$. Below the near softing temperature of plastic, the fiber has been fractured at a point so that the fiber strength is smaller then the local hydrostatic stress in the mold. It has been found that the position of fracture is changing accrding to the incling angle. In case of the above softing temperature, the larger the inclined is, the farther the flow of fiber move. Also the plastic flow has been progresed with the cicular are type.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 추계학술대회 논문집
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• pp.810-813
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• 2000

Burr makes trobles on manufacturing process due to deburring cost, quality of products and productivity. This paper described the results of experimental study on the influence of the cutting parameters on the formation of exit burrs in face milling. The cutting parameters were investigated changing exit angle, rake nagle , lead angle in tool geometry as well as feed per tooth. Also we carried out experimets on several materials. Using the result of experimental study, burr types are classified according to appearance and formation mechanism in exit burr and we are considered the burr formation in each type of burr.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.540-545
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• 1997

This paper is to evaluate the stress distibution and displacements around the single implant restoration in dentisry. The computer simulation technique using FEM was applied to the analysis, and four londing inclination were studied: verical(0 .deg.),15 .deg.,30 .deg.,45 .deg. with respect to implant axis. The magnitudes of occlusal force were 100N, 200N, 300N, 400N, and 500N. The computed result shows that the stress on a single implant restoration increases as the load or the inclined angel increases, and that the change in loading inclination has a greater effect on the stress distribution than that of the load magnitude.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.927-931
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• 1997

In process of the finish face milling of the hardended STD11 steel(H /sab r/ c50,55) by CBN tool, the optimum tool shape is suggested,which can minimize the tool fracture and by chipping by impact. The obtained results are as follows. (1) The optimal chamfer angel was about 25 .deg. , and the suitable chamfer width was 0.2mm. (2) The nose radius of tool was most excellent at 1.2mm in the viewpoint of tool wear and surface roughness. (3) Wear speed was effected by sintering method of CBN tool B.U.E

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.486-489
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• 2003

To reduce lateral force of traditional plunger type piston in the swash plate type hydraulic piston pumps and motors, we have proposed rod type piston with ball joint on both ends. We have studied the theoretical reaction force on two types of piston moving in the cylinder block bore. and made an experiment for the resistance force measurement on a reciprocating motion of plunger and rod type piston, changing the test condition such as swash plate angel and supply oil pressure and so on. As a result. a rod type piston has more smaller resistance force, about 29%. than a plunger type one.