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블록 분류와 반화소 단위 움직임 추정을 이용한 웨이브릿 변환 영역에서의 계층적 고속 움직임 추정 방법
權成根,李錫煥,潘聲元,李健一 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.3
In this paper, we proposed a fast multi-resolution motion estimation(MRME) algorithm. This algorithm exploits the half-pixel accuracy motion estimation(HPAME) for exact motion vectors in the baseband and block classification for the reduction of bit amounts and computational loads. Generally, as the motion vector in the baseband are used as initial motion vector in the high frequency subbands, it has crucial effect on quality of the motion compensated image. For this reason, we exploit HPAME in the motion estimation for the baseband. But HPAME requires additional bit and computational loads so that we use block classification for the selective motion estimation in the high frequency subbands to compensate these problems. In result, we could reduce the bit rate and computational load at the similar image quality with conventional MRME. The superiority of the proposed algorithm was confirmed by the computer simulation. 반화소 단위 움직임 추정(half pixel accuracy motion estimation, HPAME)과 블록 분류(block classification)를 이용한 계층적 고속 움직임 추정 알고리듬을 제안하였다. 제안한 알고리듬은 기존의 MRME(multi-resolution motion estimation)알고리듬보다 우수한 화질을 유지하면서 계산량 및 비트량을 크게 줄일 수 있는 장점을 갖는다. 제안한 알고리듬에서는 다해상도 영상에 대한 움직임 추정 시 고주파 부대역의 움직임 추정에 기준 움직임으로 사용되는 기저대역의 움직임 벡터를 정확하게 추정하기 위하여 HPAME을 행한다. 그리고 고주파 부대역에서는 기저대역에서의 HPAME로 인한 계산량 및 비트량의 증가를 보상하기 위하여 움직임 추정이 필요한 블록들에 대하여서만 선별적으로 미소 움직임을 추정한다. 이때 고주파 부대역에서의 미소 움직임 추정의 수행 여부는 대응되는 기저대역 블록의 움직임 벡터 특성과 블록 분류에 따른 클래스 정보를 이용하여 결정한다. 제안한 알고리듬의 성능은 컴퓨터 모의 실험 결과로부터 확인하였다.
연속적 부대역 양자화와 인간 시각 시스템을 이용한 디지털 워터마킹 알고리듬
權成根,權奇九,潘聲元,朴慶南,河仁盛,權奇龍,李健一 대한전자공학회 2002 電子工學會論文誌-CI (Computer and Information) Vol.39 No.3
A wavelet-based digital watermarking algorithm is proposed that uses the successive subband quantization and human visual system (HVS). After an original image is decomposed into 4-level by the discrete wavelet transform, perceptually significant coefficients (PSC) of each subband excluding the lowest level subbands are utilized to embed the watermark. PSC of the baseband are chosen according to their amplitude and they are slightly modified to embed the watermark by a conventional embedding method. By the successive subband quantization, PSC of the high frequency subbands are chosen and slightly modified according to the HVS. We tested the performance of the proposed algorithm compared with the conventional watermarking algorithm by computer simulation. Experimental results show that the proposed watermarking algorithm produces a better invisibility and robustness than the conventional algorithm. 본 논문에서는 연속적 부대역 양자화와 인간 시각 시스템을 이용한 웨이브릿 기반의 디지털 워터마킹 알고리듬을 제안하였다. 이 알고리듬에서는 웨이브릿 변환을 이용하여 영상을 4-레벨로 분해한 후, 가장 낮은 레벨에 속한 최고주파 부대역들을 제외한 모든 부대역들에 대하여 시각적으로 중요한 계수들을 선택한다. 기저대역에 대한 시각적으로 중요한 계수들은 계수값들의 크기를 기준으로 선택하고, 고주파 부대역에 대한 시각적으로 중요한 계수들은 연속적 부대역 양자화를 이용하여 선택한다. 고주파 부대역에 속한 시각적으로 중요한 계수들은 각 계수들이 인간의 시각에 영향을 미치는 인간 시각 시스템을 고려하여 시각적으로 보이지 않는 크기로 워터마크를 삽입하고, 기저대역에 속한 계수들은 화질 열화가 일어나지 않는 범위로 워터마크를 삽입한다. 본 워터마킹 알고리듬의 성능 평가를 위한 모의실험에서 이 알고리듬이 기존의 알고리듬보다 비가시성과 견고성에서 모두 우수함을 확인하였다.
권성근 통신위성ㆍ우주산업연구회 2012 한국위성정보통신학회논문지 Vol.7 No.3
DMB 재난 경보 방송은 재난 발생 상황을 국민들에게 신속하고 효과적으로 전달하기 위해 T-DMB 망을 통해 서비스되고 있고, DGPS 보정 정보는 GPS 수신 데이터의 정확도를 향상시키기 위하여 개발된 것으로서 보편적인 사용을 위해 T-DMB 방송망을 통해 전송되는 것이 연구되고 있다. DGPS 보정 정보가 T-DMB 방송망을 통해 전송되므로 동일한 매체로 전송되는 재난 경보 메시지에 DGPS 보정 정보를 적용한다면, 재난이 발생한 지역을 보다 정확하게 지정할 수 있고 단말기에서는 재난 발생 위치의 정확한 측정이 가능하다. 따라서 본 논문에서는 T-DMB AEAS 메시지의 구조와 수신기에서 재난의 발생 위치를 측정할 수 있는 DGPS 정보를 이용한 T-DMB 재난 경보 방송 시스템 구현 방법을 제안한다.
C-G Method를 이용한 지그재그 노면표시의 교통사고 감소 효과 분석
권성근,이영인,조성준 한국도로학회 2012 한국도로학회논문집 Vol.14 No.6
PURPOSES : This research is to evaluate the effects of zig-zag marking. METHODS : Based on the literature review, This research adopt Comparison Group method which was developed by Hauer. RESULTS : The findings are as follows. Effectiveness of treatment at all site 1.06, intersection 0.92, median bus lane 1.93, school zone 0.50, below 6-lane 0.48, above 6-lane 1.19, cat vs person 0.57, car vs car 1.36, car only 1.29. CONCLUSIONS : Though the analysis, it was founded that zig-zag marking on the small scale road(below 6-lane) and school zone contribute to reduce traffic accidents(effectiveness of the treatment : 0.50, 0.48). But the accidents at large scale road and median bus lane where installed zig-zag marking demonstrated negative result.(effectiveness of the treatment indicates exceed 1.0). PURPOSES : This research is to evaluate the effects of zig-zag marking. METHODS : Based on the literature review, This research adopt Comparison Group method which was developed by Hauer. RESULTS : The findings are as follows. Effectiveness of treatment at all site 1.06, intersection 0.92, median bus lane 1.93, school zone 0.50, below 6-lane 0.48, above 6-lane 1.19, cat vs person 0.57, car vs car 1.36, car only 1.29. CONCLUSIONS : Though the analysis, it was founded that zig-zag marking on the small scale road(below 6-lane) and school zone contribute to reduce traffic accidents(effectiveness of the treatment : 0.50, 0.48). But the accidents at large scale road and median bus lane where installed zig-zag marking demonstrated negative result.(effectiveness of the treatment indicates exceed 1.0).
연속적 부대역 양자화와 인간 시각 시스템을 이용한 디지털 워터마킹 알고리듬
權成根,權奇九,潘聲元,朴慶南,河仁盛,權奇龍,李健一 대한전자공학회 2002 電子工學會論文誌-CI (Computer and Information) Vol.39 No.5
A wavelet-based digital watermarking algorithm is proposed that uses the successive subband quantization and human visual system (HVS). After an original image is decomposed into 4-level by the discrete wavelet transform, perceptually significant coefficients (PSC) of each subband excluding the lowest level subbands are utilized to embed the watermark. PSC of the baseband are chosen according to their amplitude and they are slightly modified to embed the watermark by a conventional embedding method. By the successive subband quantization, PSC of the high frequency subbands are chosen and slightly modified according to the HVS. We tested the performance of the proposed algorithm compared with the conventional watermarking algorithm by computer simulation. Experimental results show that the proposed watermarking algorithm produces a better invisibility and robustness than the conventional algorithm. 본 논문에서는 연속적 부대역 양자화와 인간 시각 시스템을 이용한 웨이브릿 기반의 디지털 워터마킹 알고리듬을 제안하였다. 이 알고리듬에서는 웨이브릿 변환을 이용하여 영상을 4-레벨로 분해한 후, 가장 낮은 레벨에 속한 최고주파 부대역들을 제외한 모든 부대역들에 대하여 시각적으로 중요한 계수들을 선택한다. 기저대역에 대한 시각적으로 중요한 계수들은 계수값들의 크기를 기준으로 선택하고, 고주파 부대역에 대한 시각적으로 중요한 계수들은 연속적 부대역 양자화를 이용하여 선택한다. 고주파 부대역에 속한 시각적으로 중요한 계수들은 각 계수들이 인간의 시각에 영향을 미치는 인간 시각 시스템을 고려하여 시각적으로 보이지 않는 크기로 워터마크를 삽입하고, 기저대역에 속한 계수들은 화질 열화가 일어나지 않는 범위로 워터마크를 삽입한다. 본 워터마킹 알고리듬의 성능 평가를 위한 모의실험에서 이 알고리듬이 기존의 알고리듬보다 비가시성과 견고성에서 모두 우수함을 확인하였다.
반화소 단위 움직임 추정 및 움직임 벡터의 특성을 이용한 선별적인 계층적 움직임 추정
권성근 한국통신학회 2000 韓國通信學會論文誌 Vol.25 No.10
In this paper we proposed an efficient multiresolution motion estimation(MRME) algorithm using half-pixel accuracy motion estimation (HPAME) and characteristics of motion vectors in the baseband. Conventional MRME method needs exact motion vectors in the baseband because those are used as initial motion vectors in higher frequency subbands. Therefore the proposed method uses HPAME to estimate the motion vectors exactly in the baseband. Based on the characteristics of these motion vectors the motion vectors in the higher frequency subbands are selectively estimatied. That is motion vectors in the higher frequency subbands are estimated only for the blocks which have the half-pixel accuracy motion vectors in the baseband. In the proposed method by using HPAME in the baseband and selective motion estimation in the higher frequency subbands we can obtain reconstructed image with the similar quality with the conventional method though we reduce the computational complexity and the bit rate considerably.
안면신경마비 동물모델에서 전기활성고분자를 이용한 눈 깜박임 기능의 회복
권성근,성명훈,김광현,김희찬,Kwon, Seong-Keun,Sung, Myung-Whun,Kim, Kwang-Hyun,Kim, Hee-Chan 대한기관식도과학회 2006 大韓氣管食道科學會誌 Vol.12 No.2
There have been numerous modalities to recover blink function of orbicularis oculi muscle in patients with facial paralysis. However, there is still no optimal method for reanimation of eyelid. In this study, we tried to recover blink function of paralyzed rabbit's eyelid with the ion polymer metal composite (IPMC) which is one of the electroactive polymers that is spotlighted as artificial muscle. We manufactured IPMC by plating the platinum over perfluorosulphonic acid polymer ($Nafion^{(R)}$). IPMC was coated by Norland optical adhesive for the purpose of insulation and keeping it from dry. IPMC modifications by roughening the surface of Nafion, repetitive plating (maximum 4 times) with platinum, and lengthening the width of IPMC were done. The facial paralysis was induced in the rabbit by sectioning of facial nerve at the main trunk. After minimum period of 4 weeks, IPMC was inserted in the paralyzed rabbit's eyelid. By modification, the force generated by IPMC was enhanced. Restoration of blink function in paralyzed rabbit was achieved on electrical stimulation of the IPMC by 5 voltage direct current. IPMC can be promising option for facial reanimation, but further studies are needed to enhance the efficiency of IPMC.
타액선 악성 종양에서 세침흡인검사 및 동결절편검사의 유용성
권성근,안영진,서명환,정영호,하정훈,성명훈,김광현 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.9
Background and Objectives:The aim of this study was to investigate the efficacy of fine needle aspiration biopsy (FNAB)and frozen section biopsy in salivary gland malignancies. Subjects and Method:From January 1995 through December 2004,462 patients underwent operation for salivary gland mass. Of these patients, FNABs and frozen section biopsies were performedin 262 and 241 patients, respectively. The medical and pathologic reports were reviewed retrospectively. Malignancies were foundin 57 patients. Results:The sensitivity and the specificity of FNAB to detect salivary gland malignancies were 50.9% and 94.1%,respectively. For the frozen section biopsy, the sensitivity and specificity rose to 90.7% and 99.0%, respectively. When the examinationperiod was divided into period 1 (Jan, 1995-Dec, 1999) and period 2 (Jan, 2000-Dec, 2004), sensitivity showed asignificant increase from 33.3% to 57.1%. With respect to pathologic types of the tumors, the sensitivity of FNAB was high inadenocarcinoma (88.9%, 8/9) but low in mucoepidermoid carcinoma (30%, 3/10) and carcinoma ex pleomorphic adenoma (33.3%,3/9). Conclusion:FNAB alone cannot guarantee accurate diagnosis of salivary gland malignancies. Therefore, intraoperativefrozen section biopsy is recommended to make an adequate decision for surgical extent. The clinical experience of pathologistsis also an important factor in improving the accuracy of fine needle aspiration biopsy. (Korean J Otolaryngol 2006;49:922-7)