• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.197-200
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• 2008

We propose a novel n-type a-Si:H TFT pixel circuit which is proper to AMOLED display for the large size and high resolution. Proposed pixel circuit will be suit to panel for the high resolution because of different threshold sampling method. Driving method of proposed pixel circuit is very simple like an AMLCD. Our simulation indicates that the proposed pixel circuit can compensate the Vth shift and IR rising of power line so that provide better quality image.

• Journal of the Optical Society of Korea
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• 제14권1호
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• pp.1-13
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• 2010

This paper describes a development of a fiber optic common-path optical coherence tomography (OCT) based imaging and guided system that possess ability to reliably identify optically transparent targets that are on the micron scale; ability to maintain a precise and safe position from the target; ability to provide spectroscopic imaging; ability to imaging biological target in 3-D. The system is based on a high resolution fiber optic Common-Path OCT (CP-OCT) that can be integrated into various mini-probes and tools. The system is capable of obtaining >70K A-scan per second with a resolution better than $3\;{\mu}m$. We have demonstrated that the system is capable of one-dimensional real-time depth tracking, tool motion limiting and motion compensation, oxygen-saturation level imaging, and high resolution 3-D images for various biomedical applications.

• 한국중재학회지:중재연구
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• 제27권1호
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• pp.3-35
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• 2017

For recent years, several disputes between Korean consumers and multinational companies have arisen. Since the disputes were big and material that children's safety was at issue, a question started if Korean law properly has protected consumers' rights against multinational companies. While the Korean legal society tried to legislate punitive compensation with this concern, the U.S. Supreme Court reached an interesting case law regarding consumer contracts. A recent trend on consumer contracts in the United States shows that general terms have arbitration clause with class action waiver. As much as international arbitration has worked as the most effective resolution in international commercial disputes, the concept is still foreign and the experts are not approachable to lay individual consumers. However, class action in arbitration can hugely help for lay individual consumers to bring a case before arbitration tribunal. California courts consistently showed the analysis that the practical impact of prohibiting class action in arbitration clause is to ban lay individual consumers from fighting for their rights. However, the Supreme Court held that the arbitration clause shall be enforced as parties agree even if consumers practically cannot fight for their rights in the end. Even though consumer contracts are a typical example of lack of parity and of adhesive contract, the Supreme Court still applies liberalism that parties are equal in power and free to agree. This case law has a crucial implication since Korean consumers buy goods and services from the U.S. and other countries in everyday life. Accordingly, they are deemed to agree on the dispute resolution clauses, which might violate their constitutional right to bring their cases before the adjudication tribunal. This issue could be more important than adopting punitive compensation because consumers' rights are not necessarily governed by Korean law but by the governing law of the general terms and conditions chosen and written by the multinational companies. Thus this paper studies and analyzes the practical reality of international arbitration and influence of arbitration clause with class action waiver with the U.S. Supreme Court and California case laws.

• 전기전자학회논문지
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• 제26권2호
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• pp.299-305
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• 2022

다양한 물리적 신호를 디지털 신호 영역에서 처리하기 위해서 센서의 출력을 디지털로 변환하는 아날로그-디지털 변환기 (ADC)는 시스템 구성에 있어 매우 중요한 구성 블록이다. 센서 신호 처리를 위한 아날로그 회로의 역할을 디지털로 변환하는 추세에 따라 이러한 ADC의 해상도는 높아지는 추세이다. 또한 ADC는 모바일 기기의 배터리 효율 증대를 위해서 저전력 성능이 요구된다. 기존 integrating 시그마-델타 ADC의 경우 고해상도를 가지는 특징이 있지만, 저전압 조건과 미세화 공정으로 인해 적분기의 연산증폭기 이득 오차가 증가해 정확도가 낮아지게 된다. 이득 오차를 최소화하기 위해 버퍼 보상 기법을 적용할 수 있지만 버퍼의 전류가 추가된다는 단점이 있다. 본 논문에서는 이와 같은 단점을 보완하고자 버퍼를 스위칭하며 전류를 최소화시키고, 하이패스 바이어스 회로를 통해 settling time을 향상시켜 기존과 동일한 해상도를 갖는 ADC를 설계하였다.

• 전자공학회논문지CI
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• 제41권6호
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• pp.91-99
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• 2004

본 논문은 H.264와 MPEG-4 간의 원활한 통신을 하기위한 두 가지 트랜스코딩 방법을 제안한다. 같은 공간적 시간적 해상도(spatio-temporal resolution)를 유지하는 트랜스코팅 방법과 공간적 해상도(temporal resolution)를 줄이는 트랜스코팅 방법을 제안한다. H.264 비트스트림(bitstream)이 MPEG-4 비트스트림으로 변환 시 H.264 블록형태를 MPEG-4에서 사용 할 수 있는 블록형태로 변환 시켜야 하며, 4×4 블록단위의 움직임 벡터도 8×8 블록단위의 움직임 벡터로 조정하여야 한다. 두 가지 제안된 트랜스코딩 방법은 직렬 화소영역 트랜스코팅 방법(cascade pixel-domain transcoding) 보다 MPEG-4 부호화기 측에서 4.1~5.1배 부호화 속도가 빠를 뿐만 아니라 영상의 화질 저하는 최고 0.3dB정도 밖에 떨어 지지 않는다.

• 대한전자공학회논문지SP
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• 제46권6호
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• pp.102-111
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• 2009

본 논문에서는 움직임 보상 결과의 신뢰도를 바탕으로 움직임 보상 순차주사화 알고리즘의 결과와 움직임 보상 수직-시간 필터의 결과를 결합하는 순차주사화 알고리즘을 제안한다. 움직임 보상 순차주사화 알고리즘은 높은 공간 해상도를 가진 고화질 영상을 생성하지만 움직임 벡터가 잘못 추정되었을 경우 눈에 띄는 에러를 발생시킨다. 반면에 움직임 보상 수직-시간 필터는 높은 공간 해상도를 제공하지는 못하지만 움직임 벡터의 에러에 강건한 특성을 가지고 있기 때문에 전체적으로 자연스러운 영상을 제공한다. 제안하는 순차주사화 알고리즘은 추정된 움직임 벡터와 움직임 보상 순차주사화 알고리즘의 결과를 분석하여 움직임 보상의 신뢰도를 추정한 후, 움직임 보상 신뢰도에 기반 한 가중치를 바탕으로 두 가지 방법의 장점을 결합한다. 제안된 방법은 움직임 보상의 신뢰도가 높은 영역에서는 높은 공간 해상도를 제공하는 움직임 보상 순차주사화 알고리즘을 적용하고 움직임 보상의 신뢰도가 낮은 영역에 대해서는 움직임 보상 수직-시간 필터를 적용하여 눈에 띄는 에러 없이 높은 공간 해상도를 가지는 영상을 생성한다. 실험 결과에서는 제안된 알고리즘이 기존의 알고리즘에 비해 시각적 및 수치적인 면에서 뛰어난 결과를 보임을 확인할 수 있다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.1074-1078
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• 2005

In precision positioning applications, such as scanning tunneling microscopy and diamond turning machines [1], it is often required that actuators have nanometer resolution in displacement, high stiffness, and fast frequency response. These requirements are met by the use of piezoceramic actuators. A major limitation of piezoceramic actuators, however, is their lack of accuracy due to hysteresis nonlinearity and drift. The maximum error due to hysteresis can be as much as 10-15% of the path covered if the actuators are run in an open-loop fashion. Hence, the accurate control of piezoceramic actuators requires a control strategy that incorporates some form of compensation for the hysteresis. One approach is to develop an accurate model of the hysteresis and the use the inverse as a compensator. The Preisach model has frequently been employed as a nonlinear model for representing the hysteresis, because it encompasses the basic features of the hysteresis phenomena in a conceptually simple and mathematically elegant way. In this paper, a new numerical inversion scheme of the Preisach model is developed with an aim of compensating hysteresis in piezoceramic actuators. The inversion scheme is implemented using the first-order reversal functions and is presented in a recursive form. The inverted model is then incorporated in an open-loop control strategy that regulates the piezoceramic actuator and compensates for hysteretic effects. Experimental results demonstrate satisfactory regulation of the position of the piezoceramic actuator to the desired trajectories.

• 한국정밀공학회지
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• 제14권12호
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• pp.114-120
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• 1997

For compensating the error motion of hydrostatic tables, we have introduced a way that the clearance of table is controlled corresponding to the amount of eror with the actively controlled variable capillary, named as ACC. In previous paper, through the basic test, it was confirmed that by the use of ACC, the error motion within 2.7$\mu$ m of a hydrostatic table could be compensated with the resolution of 27nm, 1/100 contollable range, and with the frequency bandwidth of 5.5Hz, structurally. In this paper, we performed practical compensation of the linear and angular motion error of hydrostatic table using ACC. For improving the compensated motion accuracy, iterative control method is put into the control system. The experimental results show that by the simultaneous compensation of error, the linear and angular motion error are improved upto 0.25$\mu$ m and 0.4arcsec, which are about 1/10 and 1/3 of the non-compensated motion errors respectively.

• 한국중재학회지:중재연구
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• 제18권3호
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• pp.139-163
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• 2008

The Collective Dispute Mediation was introduced to Korea with complement the Verbandsklage which was said to be poor at monetary compensation for consumers' damages. and The Collective Dispute Mediation also seems very likely to the class action, but one can resolve the dispute before filing a law suit under the Collective Dispute Mediation. The validity of the Collective Dispute Mediation is the same as the "settlement in court". After reaching the Collective Dispute Mediation, one may have a right to ask the compulsory execution. Under the Collective Dispute Mediation the damaged party must take part directly in the dispute, because the Collective Dispute Mediation is also included in the dispute resolution. Therefore a problem that how can the damaged consumer, who do not directly take part in the dispute process, get the remedy alternatively may arise. However, this problem is solved by Compensation Plan Letter which is described in the "Framework Act on Consumer". By the Compensation Plan Letter, the person who do not directly take part in the dispute process can be remedied ex post facto(Article 68). This thesis is study on The Function and Task of Collective Dispute Mediation in the Framework Act on Consumer in our state.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1051-1054
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• 2003

For micro-weighing, null balance method is widely used in the precision industrial fields, such as biomedicine, semiconductor, chemistry and so on. In order to obtain high resolution and large measurement range simultaneously, the mechanism should be analyzed and optimized. However, large measurement error can be generated according to the mass loading position and this error is called as a corner loading error. The corner loading error is caused by the parallelism error of a Roberval mechanism used to minimize it. The corner loading error is one of the most dominant error sources that should be removed. It is possible to design that the mechanism has no corner loading error theoretically, but the mechanism of the micro weighing device is very difficult to be realized as original design due to assembling and manufacturing error. For the required specification of the device, the precise manufacturing technique under a few $\mu\textrm{m}$ is required for the realization of the design. In this paper, the effects of the parallelism error are analyzed by using Lagrange method and verified by experiment. Also, the compensation mechanism is proposed and the corner loading error is reduced by restoring tile parallelism.