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이재동 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-
비디오 데이터를 실시간으로 서비스하는 비디오 서버의 설계 시, 네트워크 가용공간, 버퍼공간 및 디스크 전송률 등이 고려되어야 하며, 특히 버퍼 공간과 디스크 전송률은 서로 많은 영향을 미치기 때문에 동시에 고려되어야한다. 본 논문에서는 VBR(Variable Bit Rate) 비디오의 효율적인 검색을 위하여 비디오 서버에서 처리되는 각 스트림들을 하드 실시간 태스크 모델로 모델링한다. 하드 실시간 시스템은 태스크들의 마감시간을 보장해야 되는 것처럼 비디오 서버는 스트림들의 연속성을 보장해야 하며, 이런 점에서 서버의 스트림들은 하드 실시간 태스크로 간주될 수 있다. 서버에서의 스트림관리는 실시간 태스크들의 스케쥴링에서 유도될 수 있다. 본 논문에서는 VBR 비디오 서버를 위한 하드 실시간 태스크 모델을 제시하고, 실시간 태스크들의 스케쥴링 알고리즘을 유도한다. 이 실시간 스케쥴링 알고리즘을 비디오 서버의 승인제어, 디스크 스케쥴링 및 버퍼 관리 등에 사용하므로서 효율적인 비디오 서버 검색을 할 수 있다. 본 논문에서 제시한 알고리즘의 성능을 분석하기 위하여 실제 MPEG 데이터를 사용하여 시뮬레이션하였다. 시뮬레이션 결과, 본 논문에서 제시한 알고리즘이 다른 알고리즘에 비하여 동시에 더 많은 스트림들을 서비스할 수 있음을 보였다 On the design of the video server to service video data in real-time, we must consider network bandwidth, buffer space and disk bandwidth. As buffer space and disk bandwidth affect each other tightly, they should be considered simultaneously . In this paper, we propose the hard real-time tasks models for the streams on the video server in order to retrieve VBR videos efficiently. The stream on the server can be considered as the hard real-time task in that the server must guarantee the continuity of streams. The management of streams on the server is induced from the scheduling of real-time tasks. We propose hard read-time tasks models for the video server and scheduling algorithms for real-time tasks. The real-time scheduling algorithms are used for admission control of streams, disk scheduling, and management of buffers in video server. We design the effective video server using the real-time tasks model. We evaluate the performance of suggested video server through a simulation using physical MPEG data. We show that the mechanism can service more streams with a few buffers simultaneously.
Helicobacter pylori 제균치료에 Rebamipide (Mucosta) 의 유용성
이재동,이문호,이강문,남승우,안병민,이동수,정현용,정일권,노임환 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.5
Bakground/Aims: Eradication of Helicobacter pylori infection is highly efficacious in preventing the recurrence of peptic ulcer. Rebamipide (Mucosta) is known to have the ability to inhibit neutrophil activity, to reduce the production of inflammatory cytokines, to scavenge oxygen radical, and to stimulate prostaglandin production. This study was designed to evaluate the effect of rebamipide on the eradication of H. pylori, and decrease of the infilatration of inflammatory cells. Methods: Eighty two patients with gastric or duodenal ulcers with H. pylori infection were allocated to two treatment groups. The patients were treated either with omeprazole 40 mg, clarithromycin 1.0 g, amoxicillin 2.0 g, rebamipide 300 mg (OCAR group) or omeprazole 40 mg, clarithromycin 1.0 g, amoxicillin 2.0 g (OCA group) for two weeks. Results: H. pylori was eradicated 56 out of 62 patients (90%) in OCAR group and 16 out of 20 patients (80%) in OCA group. The infiltration of inflammatory cells decreased in both treatment groups. No significant side effects had been noticed. Conclusions: The results of the present study suggest that rebamipide may be useful to decrease gastric mucosal inflammation in peptic ulcer disease. However, further detailed study will be reqiured to determine the potentially beneficial effect whether rebamipide can prevent the recurrence of peptic ulcer diseases with H. pylori infection.
이재동,임상진 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
This paper develops a flow control block for a hydraulic system of a tunnel boring machine. The flow control block is a necessary component to ensure stability in the operation of the hydraulic system. In order to know the pressure distribution of the flow control block, the flow analysis was performed using the ANSYS-CFX. It was confirmed that the pressure and flow rate were normally supplied to the hydraulic system even if one of the four ports of the flow control block was not operated. In order to evaluate the structural stability of the flow control block, structural analysis was performed using the ANSYS WORKBENCH. As a result, the safety factor of the flow control block is 1.54 and the structural stability is secured.