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오윤탁,박성한 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
Multimedia synchronization is requested to support a transparent multimedia service in ATM network. There are two different multimedia synchronization : intra-media and inter-media synchronization. The intra-media synchronization is to preserve the time relationship of a continuous media stream. The inter-media synchronization is to maintain the timing relation among the multimedia data streams during their transmission and display. This paper proposes Multimedia Multi-Channels Scheme(MMCS) for multimedia synchronization, and Media Delay Relief Scheme(MORS) to decrease the discard rate of the delayed packet arrived at the receiver after the target delay time using packet shortening function. By assigning each media to different channel, MMCS makes the best use of the characteristics of each media. In addition, the problems of the bandwidth assignment to a multimedia call and the multimedia traffic control in ATM network become simple. The numerical results show that the proposed schemes improve the performance of multimedia service.
다중 임계 기법과 영역확장법을 이용한 뇌졸중 병변 정합 방법 연구
탁윤오,김태윤,황해길,김동억,최흥국 인제대학교 2009 仁濟論叢 Vol.24 No.1
In clinical studies of brain stroke, it generally involves the process that spatially normalizes MR images into the standard brain template in order to find out distributions of lesion. So far MNI305, which is people’s standard brain template, has been commonly used. However in this study, to reduce some morphological differences caused by human races, ages, and sexes, we used the Korean Statistical Probabilistic Anatomical Map(Korean-SPAM). As a preprocessing methods, brightness and position of a brain had been adjusted at the first Then, stroke lesions were segmented using multiple threshold and region growing methods. Finally, stroke lesions were registered to the Korean-SPAM using Mesh Warp algorithm. We can registered various stroke MR brain images to Korean-SPAM rightly by the proposed method.
Yoon-Tak Han,Joon-Seok Oh,Jae-Hun Cha,Jae-Yun An,Seung-Yoon Hyun,Jong-Kwan Lee,In-Yong Seo,Jae-Eon Kim 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.6
To resolve overload in a distribution system, a distribution system operator (DSO) often performs a load transfer using normally open tie points and switches in the distribution line. During this process, the distribution system is momentarily operated in closed-loop operation. A closed-loop current in the distribution system can cause a power failure due to excess breaking current in the circuit breakers and reclosers. Therefore, it is necessary to calculate the closed-loop current exactly. However, if there are a large number of distributed generation (DG) systems in the distribution system, such as energy storage systems (ESS), they might obstruct the closed-loop operation based on bidirectional power flow. For quick and precise operation of a closed-loop system, the ESS has to regulate the power generation while satisfying closed-loop operation in the worst cases. We propose a strategy for balanced power regulation of an ESS. Simulations were carried out using PSCAD/EMTDC, and the results were compared with calculation results.
탁윤오(Yoon-Oh Tak),김현식(Hyeon sik Kim),박형주(hyeong ju Park),최흥국(Heung-Kook Choi),이병일(Byeong-Il Lee) 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.1
광학영상을 측정을 위해서 고민감도 냉각형 CCD(Charged Coupled Device)를 이용하여 광학분자영상측정기기를 개발하였으며, 개발한 광학영상기기에서 발광영상의 측정 및 융합영상저장을 위한 도구를 설계 및 개발하였다. 소동물을 이용하여 측정하는 분자영상 연구에 적합한 사용자 인터페이스 및 융합영상의 저장을 통해 발광영역에 대한 가시화 및 정량분석에 유용하게 사용할 수 있다.
Han, Yoon-Tak,Oh, Joon-Seok,Cha, Jae-Hun,An, Jae-Yun,Hyun, Seung-Yoon,Lee, Jong-Kwan,Seo, In-Yong,Kim, Jae-Eon The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.6
To resolve overload in a distribution system, a distribution system operator (DSO) often performs a load transfer using normally open tie points and switches in the distribution line. During this process, the distribution system is momentarily operated in closed-loop operation. A closed-loop current in the distribution system can cause a power failure due to excess breaking current in the circuit breakers and reclosers. Therefore, it is necessary to calculate the closed-loop current exactly. However, if there are a large number of distributed generation (DG) systems in the distribution system, such as energy storage systems (ESS), they might obstruct the closed-loop operation based on bidirectional power flow. For quick and precise operation of a closed-loop system, the ESS has to regulate the power generation while satisfying closed-loop operation in the worst cases. We propose a strategy for balanced power regulation of an ESS. Simulations were carried out using PSCAD/EMTDC, and the results were compared with calculation results.
뇌졸중 병변 정량화를 위한 뇌 자기공명영상의 전처리 및 정합 방법 연구
탁윤오(Yoon-Oh Tak),김태윤(Tae-Yun Kim),황해길(Hae-Gil Hwang),최흥국(Heung-Kook Choi),김동억(Dong-Eog Kim) 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.2
본 논문에서는 뇌졸중 뇌자기공명영상에서 병변을 분리해내고 그 병변을 한국인의 확률뇌지도에 사상시킴으로써 뇌졸중 영상에 대한 통계적, 정량적언 분석이 가능하도록 하는 정합 방법을 소개하려고 한다. 첫 번째 단계로써 각기 다른 밝기를 가지는 영상의 밝기를 정규화하고 두 번째는 영역확장법과 다중 임계기법을 이용한 병변 선택, 그리고 세 번째는 지정된 기준점을 중심으로 이중선형보간법과 어파인 변환을 수행하여 최종적으로 병변이 확률뇌지도 위에 사상되도록 하였다. 다양한 유형의 영상 데이터에 적용하여 테스트한 결과, 뇌 병변의 정량적 분석을 위한 초기 데이터 처리를 쉽고 빠르게 수행할 수 있었다.