• 한국정보통신학회논문지
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• 제4권5호
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• pp.1085-1093
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• 2000

이 논문에서는 객체의 크기, 움직임의 크기, 부호화 왜곡을 기준으로 다중객체간 가용비트를 효과적으로 분배하는 기법을 제안하였다. 세 변수를 이용하여 부호화하는 개념은 MPEG-4에서 다중객체를 부호화하는 데에 이용되었다. 그러나 변수들을 시각적인 관점에서 분석하여 이용하는 연구가 미흡하여 시각적으로 중요하지 않은 객체에 많은 비트가 할당되어 화질이 저하되는 결과를 초래하였다. 따라서 이 논문에서는 객체의 중요성을 세 가지 변수로 표현하고 시각적으로 비교하였다. 크기 및 움직임 정보는 입력 영상에서 미리 주어지고 왜곡량에 따라 비트를 분배하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1323-1326
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• 2007

A new driving method employing 2-dimensional spatial averaging is proposed. This method successfully eliminates the vertical line artifact caused by luminance difference from unbalanced charging voltage between polarities. This spatial averaging method can secure charging time, minimize driver heating, and achieve higher display quality.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1781-1784
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• 2007

The increase of repetition rate, the dithering of laser optics, and the extension of pulse duration time are major approaches in improving the picture quality of AMOLEDs fabricated by excimer laser crystallization (ELC). Advanced solid phase crystallization (ASPC) has been developed to improve the uniformity and the process cost. Even though the mobility of ASPC-TFT is lower than that of ELC-TFT, it is high enough to drive AMOLED pixels.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 춘계학술대회 논문집
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• pp.81-90
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• 2001

Several seismic traces of earthquakes observed from the digital new type seismograph instruments of KMA in 2000 were scanned. From these, good quality data which have high signal/noise ratio were selected and they were transformed into ascii data from binary data(min-seed format). The hypo71 program and P-S was applied in order to determine the location of epicenter, origin time and the magnitude. From these data, the 29 earthquakes, 358 seismic records consist of 587 directional components were calculated. Using these, ground acceleration data, acceleration, velocity, and displacemnet response spectrums of the structures were calculated and they could be represented in a picture by the form of tripartite response spectrum. In the result, response spectrums of the 587 directional components of the above seismic data records were obtained respectively.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.681-684
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• 2008

Motion interpolation is adopted and has been spread widely into market since it is effective in reducing motion blur, which is considered as weak characteristic due to slow response time of liquid crystal and hold-type display. 120Hz driving using interpolated frames achieves better moving picture quality with less motion blur and less motion judder. However, errors in the interpolated frames can cause visual artifacts such as static text breakup, halos, and occlusions. This paper focuses on categorizing characteristics of visual artifacts and on reducing side-effects by using information from original frames in special cases.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1483-1486
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• 2006

We describe the contrast enhancement of images using an APL(Average Picture Level) in an AC-PDP. A CEC(Contrast Enhancement Curve) determined by the APL was applied to enhance the contrast of images depending on the dominant gray levels. The most effective advantage of the proposed method is that it is easier to adjust the dynamic ranges to be enhanced with good quality and implement in a hardware system. The simulation result shows that the proposed method enhanced the contrast of given images significantly and kept the original brightness except the specific area of them compared to the HE(Histogram Equalization).

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1262-1265
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• 2005

The picture quality of a plasma display panel is very sensitive to the phosphor characteristics such as decay time, surface state, and even longevity of phosphor material in itself. In this work, material characteristics of $Zn_2SiO_4:Mn$, $Y_2O_3-coated$ $Zn_2SiO_4:Mn$, and $YBO_3:Tb$, which are dominant in commercial application, were examined for investigating the aging characteristics of green PDP phosphors. It was found that $Y_2O_3-coated$ $Zn_2SiO_4:Mn$ are easily degraded at high temperature. However, all the samples were very weak after vacuum annealing. The luminescence intensity was decreased by order of one magnitude.

• 한국통신학회논문지
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• 제21권5호
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• pp.1089-1095
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• 1996

가변블록 변환부호화는 변환부호화에 적용되는 블럭의 크기를 다르게 하여 코딩의 효율을 좋게 한다. 변환블록의 크기는 블럭의 활성도에 따라 적응된다. 즉, 블럭의 활성도가 크면 블럭의 크기는 작아지고, 반대로 활성도가 작으면 블럭의 크기가 커진다. 본 논문에서는 블럭의 활성도로서 분산값 대신에 변환계수의 고주파 에너지를 이용하였다. 컴퓨터 시뮬레이션 결과, 제안한 방법이 분산값을 이용한 방법보다는 약 1~5dB, MAD를 이용한 방법보다는 약 0.5~3dB정도의 성능개선을 보여주었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.110-112
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• 2005

In this paper, an improved AE (auto exposure) system for digital still camera is proposed. The AE system is the most important part in camera to get high quality picture image. However, there is no remarkable progress in this field until this time in spite of its importance. In recent, some researchers try to develop an AE system with signal processing technique. But it has some problems in exposure time and sometimes generates oscillation in brightness. Therefore, we develop a new system using a control technology to remove such phenomena. This new system shows about 30% improved performance than conventional one.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
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• pp.342-345
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• 1993

In this paper, we study the structure of the hierarchical coding method of video signal which can contain the multi resolution video signals. To preserve the compatibility with the conventional coding methods. we accomplished a scalable structure using the subband coding, maintaining enoughly the international coding structure. The proposed scheme showed the low PSNR, a little, when compared with the conventional scheme, but showed a good image quality perceptually and proved to have a advantage in the H/W implementation in a view of processing speed.