• 재활치료과학
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• 제9권1호
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• pp.79-90
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• 2020

목적 : 본 연구의 목적은 경직형 뇌성마비 아동들의 조음과 관련이 있는 변인들 중에서 연령, 운동기능 정도 및 섭식기능과 조음능력 간 변인에 대해 연구하는데 있다. 연구 방법 : 본 연구는 서울, 경기, 대구, 대전 및 부산 등에 거주하면서 재활의학과 전문의에 의해서 경직형 뇌성마비로 진단을 받은 2세 2개월~7세 8개월(평균 4세 7개월) 범위의 남아 34명과 여아 27명을 대상으로 하였다. 이때 조음능력인 구어 명료도, 교호운동 속도 및 교호운동 명료도를 종속변인으로 하고, 연령, 운동기능 정도 및 섭식 재질과 방법에 따른 구어 및 비구어 기제 기능을 독립변인으로 하여 중다회귀분석 실시하였다. 연구 결과 : 본 연구의 결과 경직형 뇌성마비 아동들의 조음능력 중 구어 명료도는 섭식 방법 측면에서 컵으로 먹기와 숟가락으로 먹기 동안의 비구어 기제 기능에서 유의하였다. 교호운동 속도는 운동기능 정도와 섭식 재질 측면에서 죽으로 먹기 동안의 구어 기제 기능과 섭식 방법 측면에서 컵으로 먹기 동안의 비구어 기제 기능이 유의한 결과를 보였다. 또한, 교호운동 명료도는 섭식 재질 측면에서 죽으로 먹기 동안의 구어 기제 기능과 섭식 방법 측면에서 컵으로 먹기 동안의 비구어 기제 기능에서 유의한 결과를 나타내었다. 결론 : 본 연구 결과, 경직형 뇌성마비 아동들의 조음능력 관련 변인 중 섭식기능에 따른 구어 및 비구어 기제 기능과 운동기능 정도를 고려한 섭식기능 평가와 치료가 유용할 것으로 여겨진다. 또한, 후속 연구로 뇌성마비 아동에게 적합한 섭식기능 증진 프로그램을 개발하고 적용한 후의 조음능력 개선에 대한 연구가 이루어진다면 매우 유용할 것이라고 사료된다.

• 한국초지조사료학회지
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• 제9권3호
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• pp.158-162
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• 1989

This experiment was conducted to evaluate individual difference of chewing speed and chews per bolus duing the rumination using twenty three heads of grazing cattle and thirty six heads of barn feeding cattle. Rumination behaviour was measured and recorded by the masster EMC telemeter and visual observation. The chewing speed (chews/lOOsec) was significantly different individually (C.V. 13.0-14.5 %) among the variable aged group (1-60 months), but that of same aged group showed lower difference (C.V. 4.5 %). The chews per bolus showed even larger individually difference than the chewing speed, so the variable aged group (1-60 months) resulted the 15.5-16.2 %of C.V.and the same aged group showed the 9.5 % of C.V. Under 12 month aged cattle showed more rapid chewing speed than older aged cattle. The chewing speed changed with the growth of cattle, but the chews per bolus did not show any relationship with age, so it is regarded as the individually characteristic pattern.

• Journal of Electrical Engineering and Technology
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• 제8권1호
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• pp.118-123
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• 2013

This paper presents performance comparison between concentrated winding and distributed winding of IPMSM (Interior Permanent Magnet Synchronous Motors) which is recently used for light-weight railway applications. Motors are designed on various schemes and analyzed by using FEM (Finite Element Method) instead of EMCNM (Equivalent Magnetic Circuit Network Method) in order to take into account saturation and non-linear magnetic property. The overall performance such as torque, torque ripple, losses, demagnetization, efficiency, power density and so on are investigated in detail at the rated and maximum operating speed. The results of the analysis found that both concentrated and distributed winding IPMSMs are promising candidates for high power railway traction motor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1402-1404
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• 2000

The electrified railway has various power supply schemes. Although the identical trains are operated in same condition and the impedance of track are equal, the genealogy impedance of track is changed according to composition method of feeding scheme. So, the harmonic current flowing into the railway substation are greatly unlike. For simulation of harmonic magnification flowing into the railway substation according to feeding scheme, we propose 6-port network analysis method based on 4-port network, find 6-port equivalent model of each circuit component, and compare and investigate harmonic magnification in the case of parallel post and normal feeding scheme.

• 한국기계가공학회지
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• 제11권6호
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• pp.9-15
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• 2012

Vibrational film has been more employed in ear-phones or small type of speakers along with a wide use of portable multi-media equipments such as MP3 and MP4. However, the current hand work production process of diaphragms is inefficient. In this study, a die-and-mold and a single production forming machine are developed, and they result in a multi-production forming machine. The multi-production forming machine consists primarily of a film feeding unit and an unwinding unit. A vacuum suction device provides the film feeding unit, while the unwinding unit is obtained using an appropriate damper. The advantage of the developed single production forming machine is shown according to a proper voice test.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.382-386
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• 2002

The tapping is machining process that makes a female screw on the parts to be assembly together. It is used for the high-speed tapping machine with synchronizing function for the high productivity. This paper describes the development of the ultra high-speed tapping machine with 10,000rpm. The key factors in the tapping speed are the acceleration/deceleration velocity and the synchronizing errors between the spindle motor and feeding motor. To minimizing acceleration/deceleration time, the low inertia spindle with synchronous built-in servo motor is developed. To minimizing synchronizing errors, the tapping cycle algorithm under open architecture CNC environment is optimized. The developed tapping machine has 0.13sec/10,000rpm in acceleration/deceleration time and the synchronizing error below 4.0%. It has 0.55sec for cycle time of one female screw, M3 tap, 2 times depth of tap diameter.

• 한국정밀공학회지
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• 제16권7호
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• pp.94-100
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• 1999

This study adopted the ultra precision machining system which was composed of an air bearing spindle, a granite bed, air pad and a linear feeding mechanism. It also applied the cutting experiment on the aluminum alloy. To evaluate the safety of high speed machining, we examined the surface roughness according to the changes of cutting speed and obtained the speed limit. This paper also studied the effect of cutting condition such as feed rates and depths of cut on the surface roughness within the speed limit. This provided practical information regarding ultra precision machining.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 춘계학술발표대회 개요집
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• pp.68-70
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• 2002

A CCD camera with a laser strip was applied to realize the automation of welding process in GMAW. The Hough transformation was used to extract the laser stripe and to obtain specific weld points. In this study, a neural network based on the generalized delta rule algorithm was adapted for the process control of GMA, such as welding speed, arc voltage and wire feeding speed.

• 한국통신학회논문지
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• 제21권2호
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• pp.313-325
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• 1996

This paper presents a new architecture for full-search block-matching motion estimation. The architecture is based on linear systolic arrays. High speed operation is obtained by feeding reference data, search data, and control signals into the linear systolic array in a pipelined fashion. Input data are fed into the linear systolic array at a half of the processor speed, reducing the required data bandwidth to half. The proposed architecture has a good scalability with respect to the number of processors and input bandwidth when the size of reference block and search range change.

• 한국생산제조학회지
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• 제20권4호
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• pp.446-451
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• 2011

Recent trends for the miniaturization and weight reduction of portable electronic parts have driven uses of subminiature components. Assembly of the miniaturized components requires subminiature screws of which pitch sizes are micrometer scale. To produce such subminiature screws with high precision threads, not only a precision forming technology but also a high-precision measurement technology is required. The present study covers the development of a vision inspection system for precision screws for the automatic measurement of subminiature screws with high speed and reliability. In this study, the feeding unit that transfers the subminiature screws to the inspection unit is investigated through finite element(FE) analysis. The vibration characteristics of the feeding unit are predicted through FE analyses, from which we can determine whether the subminiature screw can be stably fed into the inspection unit or not. The effects of several design parameters on the vibration characteristics are also discussed.