• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.179-179
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• 2010

본 연구에서는 무안경식 3 차원 입체영상 기술에 쓰이는 렌티큘러 렌즈의 제작공정 중 오차(Error)로 작용할 수 있는 몇 가지 변수를 가정하였고 이러한 변수의 오차에 의해 좌우되는 가장 중요한 성능인자인 광학적 상호간섭 (Cross-Talk)을 최소화하도록 연구를 수행하였다. 이를 위해서 초정밀절삭가공과 UV경화법을 사용하였고 광학적 상호간섭 (Cross-Talk)에 가장 큰 영향을 주는 피치공차 (Allowance)를 ${\pm}0.5{\mu}m$내로 줄여서 3차원 입체감을 향상시킬 수 있음을 확인하였다.

• Journal of the Korean Society for Precision Engineering
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• v.15 no.8
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• pp.109-115
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• 1998

This paper describes the development of a 6-component load cell with plate beams which may be used to measure forces Fx, Fy, Fz and moments Mx, My, Mz simultaneously in industry. We have analyzed the bending strains on the surface of the beams under forces or moments by using Finite Element Method and designed the sensing elements of 6-component load cell. We have also determined the attachment location of strain gages of each load cell and fabricated 6-component load cell. To evaluate the rated strain and interference error of each load cell, we have carried out characteristic test of 6-component load cell.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.222-232
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• 1999

This paper describes the development of a precision 3-component load cell with plate beams which may be used for measuring forces Fx, Fy and moment Mz simultaneously in industry. We have derived equations to predict the bending strains on the surface of the beams under forces or moment. We have also determined the attachment location of strain gages of each sensor and fabricated 3-component load cell. To evaluate the rated strain and interference error of each sensor, we have carried out characteristic test of precision 3-component load cell. It reveals that the rated strain calculated from the derived equations are good agreement with the results from Finite Element Method analysis.

• Korean Journal of Optics and Photonics
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• v.7 no.1
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• pp.37-43
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• 1996

Two type interference air refractometers have been developed by using a frequency stabilized He-Ne laser in a transverse magnetic field. The refractometers were based on symmetric multiple pass interferometer. In this system, One part of the beams passed through air whose refractivity is to be measured and the other part of the beams passed through a vacuum champer to be used as a reference. Several measurements were performed under normal air condition. Maximum difference between two interference refractometers was ${\pm}2{\times}10^{-8}$.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.13 no.1
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• pp.85-93
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• 1988

Installation of the digital carrier system is increased rapidly in the telecommunication network, and most of systems are operating over a twisted pair conductor. Many systems are accommodated in multipair cable for their economical installation, therefore we must consider tha crosstalk interference between digital systesm. This paper considers the calculation method which determine crosstali interference between signals in multipair. And the transmission margin at a certain error rate is analyzed considering crosstalk power. Finally, this paper estimates the crosstalk noise susceptibility of 2.048Mbps relative to 1.544Mbps PCM system and 1.544Mbps relative to 2.048Mbps PCM system, and then considers the methos which both systems can operate together in a same cable.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.7
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• pp.621-628
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• 2016

This paper presents the development of a deadweight type 6-component force/moment generator for estimating characteristics of multi-component loadcell. Several new methods in moment generation are introduced in order to produce accurate force / moment and to minimize coupling effect between each force or moment components. In order to verify the reliability of the calibration system developed, estimation of the method for generating moment components and cross measurements between force or moment components are carried out utilizing a commercial torque cell and both-ends fixed beam designed in this paper.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2C
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• pp.246-253
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• 2010

In this paper, a method of removing the space skew and cross-talk cancellation is proposed where the self-generated signals from the subject are used to obtain the subject's location. In the proposed method, the good spatial sound image is maintained even when the listener moves from the sweet spot. Two major parts of the proposed method are as follows: listener position tracking using the stimuli from the subject and removal of the space skew and cross-talk signals. Listener position tracking is achieved by estimation of the time difference of arrival (TDoA). The position of the listener is then computed using the Talyer-series estimation method. The head-related transfer functions (HRTF) are used to remove the space skew and cross-talk signals, where the direction of the HRTF is given by the one estimated from the listener position tracking. The performance evaluation is carried out on the signals from the 100 subjects that are composed of the 50 female and 50 male subjects. The positioning accuracy is achieved by 70%~90%, under the condition that the mean squared positioning error is less than $0.07m^2$. The subjective listening test is also conducted where the 27 out of the 30 subjects are participated. According to the results, 70% of the subjects indicates that the overall quality of the reproduced sound from the proposed method are improved, regardless of the subject's position.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1992.08a
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• pp.121-125
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• 1992

입사파와 반사파의 분리는 수리모형실험에 있어서 기본적이면서도 대단히 중요한 문제이다. 최근까지 개발된 분리기법으로는 Goda and Suzuki (1976)의 2점법과 Mansard and Funke (1980)의 3점범을 들 수 있다. 2점법은 두 지점에서의 파고를 관측하여 분리하는 기법으로 두 지점사이의 거리에 따라 해가 존재하지 않는 파랑조건이 존재하며 수조에서 발생되는 횡파, 비선형 파랑상호 간섭, signal noise, 측정오차 등에 민감한 단점이 있다.(중략)

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.52-53
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• 2003

세슘 원자 주파수 표준기에서 사용되는 램지 방법은 세슘 원자 빔을 U-자형 마이크로파 공진기로 지나게 하여 마이크로파와 시간 간격을 두고 두 번 상호작용하게 함으로써 간섭형 원자 공진 신호를 얻는 방법이다(그림 1). 이 방법을 사용하면 그림 2와 같은 공진 신호를 얻는데 이를 램지 신호라 한다. 원자 주파수 표준기의 정확도 평가를 위해서는 사용된 세슘 원자 빔의 속도 분포를 알아야 하는데, 이 램지 신호를 이용하여 속도 분포를 구할 수 있다. (중략)

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.6
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• pp.771-780
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• 2010

This paper describes the design process of a six-component force/torque (F/T) sensor. The new six-component F/T sensor having leaf spring ends has been developed using a cross beam structure as the basic sensing element. Fundamental strain analysis of both ends fixed beam having a leaf spring structure is performed by finite element analysis. In order to obtain similar output sensing strains from the six component loads and minimize coupling strains, the optimal location of strain gages is determined and the strain gages are connected so that the bridge circuits with four strain gages would be balanced. Using leaf spring ends instead of rigid fixed ends, remarkable increment in output sensing strain can be achieved for two component forces. Several modifications in design result in a similar sensing strain of approximately $400\;{\mu}m/m$ for the six-component forces and moments, and a reduced coupling strain of $0\;{\mu}m/m$ between the forces and moments.