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김병용(Byoung-Yong Kim),이선오(Seon-Oh Lee),정광수(Kwang-Su Jung),심동규(Dong-Gyu Sim),이수연(Soo-Youn Lee) 대한전자공학회 2009 電子工學會論文誌-SP (Signal processing) Vol.46 No.3
본 논문에서는 실시간 멀티미디어 스트림 서비스에서 발생하는 비디오 품질 저하 요인에 따른 비디오 품질 측정 방법을 제안한다. 비디오 품질 저하에는 대표적으로 비디오 압축과 네트워크의 상태에 의해 발생한다. 본 논문에서는 비디오 압축에 의하여 생기는 화질 저하를 측정하기 위하여 공간 도메인에서 블록킹 왜곡에 대한 정도를 측정하는 방법을 제안한다. 제안하는 블록 경계 강도는 8×8 블록 경계에서 픽셀 간의 변화와 경계를 제외한 주변영역에서 픽셀 사이의 변화에 대한 비율로 나타내었다. 반면, 움직임이 부자연스러운 동영상은 지터 및 지연 요소와 같은 네트워크 전송능력의 악화로 인해 비디오 품질 저하가 나타난다. 본 논문에서 제안하는 시간적 저키니스는 연속된 프레임의 대응되는 픽셀간의 밝기값 차이에 대한 평균과 현재 프레임과 이전 프레임의 재생시간 간격의 평균 및 분산을 이용하는 방법을 제안하였다. 또한, 본 논문에서는 비디오 압축에 의한 품질 측정 방법인 블록 경계 강도와 네트워크에 의한 품질 측정 방법인 시간적 저키니스를 통합하여 비디오의 종합적 품질을 평가하는 Perceptual Video Quality Metric (PVQM)을 제안한다. 제안한 알고리즘의 성능을 평가하기 위하여, 사람이 직접 비디오 품질을 평가하는 Difference of Mean Opinion Score (DMOS)와 제안한 알고리즘을 비교 평가하였다. 그 결과 제안한 PVQM의 결과와 인간 시각에 의하여 평가된 DMOS가 근사함을 확인하였다. This paper presents a video quality assessment method based on quality degradation factors of real-time multimedia streaming services. The video quality degradation is caused by video source compression and network states. In this paper, we propose a blocky metric on an image domain to measure quality degradation by video compression. In this paper, the proposed boundary strength index for the blocky metric is defined by ratio of the variation of two pixel values adjacent to 8×8 block boundary and the average variation at several pixels adjacent to the two boundary pixels. On the other hand, unnatural image movement caused by network performance deterioration such as jitter and delay factors can be observed. In this paper, a temporal-jerkiness measurement method is proposed by computing statistics of luminance differences between consecutive frames and play-time intervals between frames. The proposed final Perceptual Video Quality Metric (PVQM) is proposed by consolidating both blocking strength and temporal-jerkiness. To evaluate performance of the proposed algorithm, the accuracy of the proposed algorithm is compared with Difference of Mean Opinion Score (DMOS) based on human visual system.
최병호(Byung-Ho Choi),허진영(Jin-Young Huh),박동균(Dong-Joon Park),김병용(Byoung-Yong Kim),이승호(Seoung-Ho Robert Lee),박선영(Sun-Young Park) 대한구강악안면외과학회 2003 대한구강악안면외과학회지 Vol.29 No.1
In this study, we showed that neurons could be generated from adult canine bone marrow stem cells by culturing with DMSO/BHA/FeCl2. These neurons differentiated from the bone marrow stem cells formed neurites, expressed neuron-specific markers. This differentiation was enhanced by FeCl2. These results suggest that iron can effectively initiate differentiation of adult bone marrow stem cells into neurons.
박정호,김병용 진주산업대학교 농업기술연구소 2001 農業技術硏究所報 Vol.14 No.-
In this study, monthly variations of the acid deposition for air pollutants were analysed. Acid deposition was collected by total (soluble + insoluble fraction) deposition sampler in Chinju area from April to September 2000, and the concentrations of dissolved ionic components (F^-, Cl^-, NO_3^-, SO_4^2-, Na^+, K^+, Ca^2+, NH_4^4, Mg^2+), pH and E.C. in the soluble deposition fraction were determined. Most soluble deposition showed acid character (pH < 5.6), and only 29% had a pH higher than 5.6. And the mean pH values at A∼B site were in the range of 4.0∼5.3. The sum deposition of all anion and cation species were in order of A>B>D>C site, and mean SO_4^2- deposition was 4.96∼21.84 mg/㎡·day.
최수정,김영석,김나리,정승원,이선해,정준성,류권호,차상우,홍수진,유창범,문종호,김연수,이문성,심찬섭,김부성,권계원,김병용 대한간학회 2002 Clinical and Molecular Hepatology(대한간학회지) Vol.8 No.4
Hepatocellular carcinoma is one of the most common causes of death in Koreans. Most cases of hepatocellular carcinoma are beyond the stage of curative resection at the time of diagnosis due to extrahepatic metastasis as well as wide distribution of tumor in the liver. The lung is the most common site of extrahepatic metastasis but metastasis to gingiva is very rare in hepatocellular carcinoma. We report a case hepatecellular carcinoma with gingival methststasis in a 59 year old male patient.(Korean J Hepatol 2002;8:495-499)
조현오,곽경덕,김병용,손수민,오필환 대한골절학회 1999 대한골절학회지 Vol.12 No.2
We have reviewed seven cases of fracture-separation of the distal humeral epiphysis, two of which were initially misdiagnosed as a fracture of the lateral condyle and one as a fracture of the supracondyle. The four cases were treated by closed reduction and cast immobilization, and three cases by open reduction and internal fixation. The one case with conservative treatment had cubitus varus, other were good result. To distinguish the fracture-separation from a fracture of lat. condyle and from a dislocated elbow is impossible using clinical signs alone. For reducing misdiagnosis, it is important to consider age and there could be need further evaluation such as arthrogram, USG, CT and MRI.
조성도,조현오,곽경덕,김병용 대한골절학회 1994 대한골절학회지 Vol.7 No.1
Supracondylar fracture of the humerus is the most common fracture about the elbow in children. Due to the thinness in this region, it is difficult to reduce the displaced fracture and to maintain the reduction. The purpose of this study is to review the change in carrying angle after this fracture with references to the level and type of the fracture and method of treatment. The authors reviewed 90 cases of supracondylar fracture in children. Ten cases were treated conservatively, sixty eight by percutaneous pinning and twelve by open reduction. With regard to the level of the fractures, sixty nine cases(78.9%) revealed fracture through the olecranon fossa. And the less the age of the patient, the more distal was the level of the facture. 'Change in carrying angle was more common in fractures through the olecranon fossa, in cases of type 4 fractures and in cases of percutaneous pinning. About one third of the cases with fish-tail sign or medial impaction on postopvrative roentgenogram showed change in carrying angle of more than 6 degrees. Cases with change in carrying angle or more than 6 degrees revealed insufficient redution or inadequate fixation. In cases of open reducton the results were good or excellent in all.
조현오,곽경덕,문진경,김병용,손수민 대한골절학회 1998 대한골절학회지 Vol.11 No.2
We have reviewed 40 patients of acute acromioclavicular dislocation all treated by several operative procedure from January 1990 to July 1996. After about l2 months follow up period, we analyzed the relationship between the type of operation and the clinical results. Several operative methods were demonstrated till now, but 4 techniques or their combinations are commonly used. Those are fixation of acromioclavicular joint, fixation of coracoclavicular ligament, resection of distal end of clavicle and dynamic muscle transfer. Modified Phemister technique, modified Phemister technique with coracoclavicular fixation and modified Bosworth technique were used with or without repairment of coracoclavicular ligament at our hospital. Modified Phemister technique showed less good results than those of other techniques especially when repair of the coracoclavicular ligament was not made, and the repair of the coracoclavicular ligaments or fixation of the coracoclavicular joint is an important factor affecting the final results.