• Journal of the Institute of Electronics Engineers of Korea SD
• /
• v.46 no.2
• /
• pp.78-84
• /
• 2009

In general video coding systems, motion estimation (ME) is regarded as a vital component in a video coder as it consumes a large amount of computation resources. Fractional pixel motion estimation can improve the video compression rate at the cost of higher computational complexity. It is based on the experimental results that the sum of absolute differences (SAD) shows parabolic shape and thus can be approximated by using interpolation technique. In this paper, we propose a fast fractional pixel search algorithm by combining SASR (Simplified Adaptive Search Range) and the CBCDS (Center Biased Cross-Diamond Search) pattern with the predicted motion vector. Compare with the fractional pel full search and the CBFPS, the proposed CBCDS algorithms can reduce fractional pel search points up to 81.4%, respectively with the PSNR lost about 0.05dB.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2010.11a
• /
• pp.184-187
• /
• 2010

본 논문에서는 움직임 추정(Motion Estimation, ME), 색상 라벨링(Labeling) 그리고 Non-Local means 필터 등을 이용하여 2D 영상을 3D 입체 영상으로 변환하는 기법을 제안한다. 제안하는 기법에서는 프레임 간의 움직임 추정 방법을 사용하여 물체의 움직임 벡터를 추출하며 색상 라벨링 작업을 통해 세밀한 객체를 추출한다. 객체를 추출한 후 영상을 이동시켜서 우영상을 생성한다. 우 영상을 생성하는 과정에서 채워지지 않은 화소들이 발생하는데 전체 화소의 상관도를 고려하는 Non-local means 필터를 사용하여 이 부분을 처리한다. 생성된 우 영상과 원본 영상인 좌 영상으로 비월주사(interlace)하여 최종 3D 입체 영상을 생성한다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
• /
• 2001.05a
• /
• pp.186-189
• /
• 2001

본 연구에서는 2종류의 색온도(4000 K, 2700 K)조건 하에서 작업자의 피로도를 평가하기 위하여 피험자에게 검색작업을 부가하고 주관평가 및 생리신호를 측정하였다. 주관평가는 ME(Magnitude Estimation)법의 설문지를 사용했으며, 생리신호는 ECG, 맥파, 피부전도도, 피부온도, 호흡, 뇌파를 측정하여 그중 ECG신호를 분석하였다. ECG신호 파라미터로서 IBI, BPM, 평균 BPM, LF/HF, CSI, CVI, CV-RR를 분석한 결과, 특히 CSI, CVI, CV-RR가 피로도와 상관관계가 높았다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.05a
• /
• pp.511-514
• /
• 2007

This study aims to derive the effect of road traffic noise perception by the visual and aural information through a laboratory experiment. To verify the result more precisely, ME(Magnitude Estimation) and SD(Semantic Differential Method) evaluation on the effect of visual and aural effect were carried out by 43 university students. As the result, up to 10% of psychological reduction effect was shown under the 65dB(A). As the noise level, it was analyzed that the vision affected about 7dB(A) and sound affected 5dB(A). However, if these two are given simultaneously, mainly sound affects to reduce the annoyance of noise and the vision next. Compared with the urban central circumstances, this effect(2dB(A) under 65dB(A) noise) was shown smaller than field test.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2010.07a
• /
• pp.432-434
• /
• 2010

움직임 추정(ME)은 동영상 압축에서 영상 화질과 인코더 속도에 대하여 중요한 역할을 하지만, 많은 수의 메모리 접근과 연산량이 발생한다. 기존의 움직임 추정 방법은 현재 프레임의 블록을 참조 프레임의 검색범위 내의 블록과 매칭하여 움직임 차이를 계산하여 움직인 위치를 추정하게 된다. H.264와 같은 최근의 압축 표준에서는 1/4화소 단위까지 움직임 예측을함으로써 영상 데이터 압축의 효율을 높일 수 있으나, 많은 양의 메모리 접근과 연산의 복잡도가 크게 증가하게 된다. 본 논문에서는 메모리 접근 횟수를 감소시키기 위하여 SAR(Search Area Reuse)알고리즘을 사용하여, 참조 프레임의 블록을 현재 프레임의 블록과 매칭하여 움직임 예측하는 방법을 제안한다. 본 논문에서 제안하고 있는 아키텍쳐는 현재프레임의 검색범위 내에 있는 데이타를 재사용함으로서 메모리 액세스를 줄일 수 있으며, 참조프레임의 한 블록당 1/4화소 단위까지의 연산을 한 번만 하게 되므로 메모리 접근 횟수 감소와 함께 연산의 복잡도도 줄일 수 있다.

• 한국신재생에너지학회:학술대회논문집
• /
• 2006.11a
• /
• pp.153-156
• /
• 2006

The domestic solar radial ion data have been measured at 16 different sites all over the country since the beginning of 1980. It is very important that the fundamental data for the estimation and assessment of local solar radiation can be secured this project. In order to estimate available energy resource from solar radiation, it is necessary to have enough data, more than 30 years In any country. However since we have collected solar radiation(global radial ion including direct normal radiation) data only for 10 years we still need to measure insolation to secure the reliability and standardization of measured local solar radial ion data. In brief, the major activities on this R&D include rout me maintenance of the national network for insolation data measurement, evaluation of the collected data, and reliability enhancement for assessing the quality of solar radiation data as well.

• Journal of Radiation Protection and Research
• /
• v.26 no.3
• /
• pp.249-253
• /
• 2001

Neutron dose assessment in criticality accidents using Whole Body Counter (WBC) was proved to be an effective method as rapid neutron dose estimation at the JCO criticality accident in Tokai-mura. The 1.36MeV gamma-ray of $^{24}Na$ in a body can be detected easily by a germanium detector. The Minimum Detectable Activity (MDA) of $^{24}Na$ is approximately 50Bq for 10miniute measurement by the germanium-type whole body counter at JNC Tokai Works. Neutron energy spectra at the typical shielding conditions in criticality accidents were calculated and the conversion factor, whole body activity-to-organ mass weighted neutron absorbed dose, corresponding to each condition were determined. The conversion factor for uncollied fission spectrum is 7.7 $[(Bq^{24}Na/g^{23}Na)/mGy]$.

• Proceedings of the KSME Conference
• /
• 2003.04a
• /
• pp.893-898
• /
• 2003

Coulomb friction is an important factor for precise position tracking control systems. The control systems with friction causes the steady state error because of being sensitive to the change of system condition and highly nonlinear characteristics. To overcome these problems, we use an estimation scheme of Coulomb friction to experiment for it's compensating. The estimated factor for Coulomb friction is used as a feed-forward compensator to improve the tracking performance of ball-screw systems. The tracking performance was improved by compensating the estimated friction torque in the feed-forward term. And, the sliding mode control which is derived from the Lyapunov stability theorem is applied for robust stability and reducing chattering. The experimental results show that the sliding mode controller with adaptive friction compensator has a good tracking performance compared with the friction uncompensated controller.

• IEIE Transactions on Smart Processing and Computing
• /
• v.5 no.4
• /
• pp.235-242
• /
• 2016

The emerging High-Efficiency Video Coding (HEVC) standard attempts to improve coding efficiency by a factor of two over H.264/Advanced Video Coding (AVC) at the expense of an increase in computational complexity. Mode decision with motion estimation (ME) is still one of the most time-consuming computations in HEVC, as it is with H.264/AVC. Thus, fast mode decisions are not only an important issue to be researched, but also an urgent one. Several schemes for fast mode decisions have been presented in reference software and in other studies. However, the conventional hierarchical mode decision can be useless when block-level parallelism is exploited. This paper proposes operation-level exploration that offers more chances for early termination. An early termination condition is checked between integer and fractional MEs and between the parts of one partition type. The fast decision points of the proposed algorithm do not overlap those in previous works. Thus, the proposed algorithms are easily used with other fast algorithms, and consequently, independent speed-up is possible.

• Environmental Engineering Research
• /
• v.17 no.1
• /
• pp.47-56
• /
• 2012

A long-term nationwide nonpoint-source pollution monitoring program was initiated by the Ministry of Environment Republic of Korea (ME) in 2007. Monitoring devices including rain gauges, flow meters, and automatic samplers were installed in monitoring sites to collect dynamic runoff data in 2008-2009. More than 10 rainfall events with three or more antecedent dry days were monitored per year. More than 10 samples were collected and analyzed per event. So far, five land use types (single family, apartments, education facilities, power plants, and other public facilities) have been monitored 23 to 24 times each. Characterization of the runoff from different land use types will aid unit load estimation in Korea and hopefully in other countries with similar land use. The monitoring results will be reported regularly at national and international levels.