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김정학,김석윤 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5
In this paper, we propose a newly structured circuit that can compensate for the manufacturing process non-uniformity problem of data driver circuits for PMOLED’s (passive matrix organic light emitting diode). A conventional data driver circuit for an OLED cannot compensate for the current deviation at the data driver circuit output terminal generated by MOS (metal oxide semiconductor) process changes, but the proposed data driver circuit can allow uniform current values to an OLED panel by calibrating the current deviation at the output terminal. The proposed circuit can minimize the deviation of the output current via a process change by connecting the circuit for the data output current to a common interconnect line by adding a switching transistor to the existing data output circuit. The circuit proposed in this paper was designed based on an OLED panel supporting QQVGA resolution, and the process used for driver circuit development was a 0.35um process. The experimental results shows the output current of the data driver circuit proposed here had a 1% range of error while a 7% range of severe change was demonstrated in the case of the previous data driver circuit. When using the proposed data driver circuit for an OLED, a high-definition OLED display can be realized and the circuit can be utilized for mobile display devices requiring high-quality display features. In this paper, we propose a newly structured circuit that can compensate for the manufacturing process non-uniformity problem of data driver circuits for PMOLED’s (passive matrix organic light emitting diode). A conventional data driver circuit for an OLED cannot compensate for the current deviation at the data driver circuit output terminal generated by MOS (metal oxide semiconductor) process changes, but the proposed data driver circuit can allow uniform current values to an OLED panel by calibrating the current deviation at the output terminal. The proposed circuit can minimize the deviation of the output current via a process change by connecting the circuit for the data output current to a common interconnect line by adding a switching transistor to the existing data output circuit. The circuit proposed in this paper was designed based on an OLED panel supporting QQVGA resolution, and the process used for driver circuit development was a 0.35um process. The experimental results shows the output current of the data driver circuit proposed here had a 1% range of error while a 7% range of severe change was demonstrated in the case of the previous data driver circuit. When using the proposed data driver circuit for an OLED, a high-definition OLED display can be realized and the circuit can be utilized for mobile display devices requiring high-quality display features.
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김정학 안성산업대학교 1981 論文集 Vol.13 No.-
이상은 실내실험에 있어 공시체의 수분을 가감시키지 않고(수분의 공급을 차단함) 얼다-녹다를 작용케한 흙의 역학적 성질의 변화에 대하여 고찰한 결과로서 다음과 같이 요약할 수 있다【l978:수분이동 및 압축강도와 얼다-녹다한 회수와의 관계, 1979:강도회복에 관한 실험 포함】 1. 흙이 얼다-녹다할 때 흙(공시체)의 함수비가 클 수록 ㄱ. 공시체 내부의 수분 이동과 체적 팽창은 정도가 높았으며 이로 인하여 공시체 내부의 상태는 이중층의 변화체적 팽창 미소 균렬의 발생등이 생겨 역학적 성질에 변화를 초래할 것으로 생각된다 ㄴ. 압축강도 현저하게 떨어졌으며 이것은 얼 때의 빙정분리작용과 관련된 미소 균렬의 발생 또는 구속수의 자유수화가 불가역적이 때문에 자유수의 증가 등으로 인한 것으로서 흙의 압축강도는 함수비의 증가없이 얼다-녹다 작용만으로도 저하됨을 알 수 있다. ㄷ. 압축강도의 회복도 현저하게 떨어지지만 이는 함수비 외에도 변형도가 를 때 또는 양생 일수가 짧을때 강도 회복비는 감소하였다. 2. 얼다-녹다의 회수가 많을 수록 압축강도가 떨어지거나(고함수비의 공시체) 또는 큰 변화가 없더라도(저함수비 공시체) 강도 증가의 저해 요인(얼지 않은 공시체에 비하여)이 된다는 것을 알수 있었다. 3. 얼다-녹다를 받은 공시체는 축차응력이 어느 정도 이상으로 되면 변형도가 급증하며 또 반복 응력을 받으면 강복상태 부근에서의 연화현상이 현저하게 나타나서 흙의 역학적 성질에 변화를 초래한다 . 위는 실내 실험에서 얻어진 것이지만 실외 실험에서는 위 실험결과와 많은 차이가 있을 것으로 생각된다. This study is to investigate the effect of same mechanical properties of soil on the freezed and thawing in laboratory testing. Some results obtained in this study are summerized as follows. 1. In freezed and thawing soil, the compressive strength is decreased with the increase of the moisture content, and the recovery of strength is delaed with the increase of the moisture content. 2. The phinomina of abruptly steep in the strain is increased with the increase of deviatorstress. 3. When the freezed and thawing soil was received repeatedly stress, expressed the liquefaction distinguished.
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김정학 안성산업대학교 1985 論文集 Vol.17 No.-
The earth structure, such as an embankment of the river or an earth dam decreases its stability by the seepage action. Thereforce, it is necessary to find the relationships between the stability of the dam body and the effects of the movement of the seepage flow, which result from a rainfall and a rise in water-level of river. This experiment is on the movement of the seepage water within the dam body, when the rainfall and a rise in stage coincided. From this experiment, it was found that the increment of seepage and a rise in water-level within dam body were the more faster in coincides case than in the case of a rise in stage without a rainfall, and consequently decreased the stability of dam body.
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