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분산 실시간 시스템상에서의 결함 허용 기법에 관한 연구
사공 명,허신 한양대학교 공학기술연구소 1992 공학기술논문집 Vol.1 No.1
Since the failure of computer systems may endanger valuable human lives and results in great financial loss, the importance and necessity of the Fault-Tolerant Systems are increasing in wide areas. In this paper, we propose the software fault-tolerant techniques for the Distributed Real-Time Systems. The proposed fault-tolerant scheme requires one primary try block, one or more alternate try blocks, and an acceptance test. We use the Watch-dog Timer implemented in software to limit the execution time of each tar block. With simulation on the UNIX system, the execution overhead of proposed fault-tolerant scheme is compared to that of nonfaulty softwares.
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임경재,최중대,김기성,사공 명,버나드 엥겔 江原大學校 附設 環境硏究所 2003 環境硏究 Vol.20 No.-
The Revised Universal Soil Loss Equation (RUSLE) has been used in over 100 countries to estimate potential long-term soil erosion from the field. However, the RUSLE estimated soil erosion cannot be used to estimate the sediment delivered to the stream networks. For an effective erosion control, it is necessary to compute sediment delivery ratio (SDR) for watershed and sediment yield at watershed outlet. Thus, the Sediment Assessment Tool for Effective Erosion Control (SATEEC) was developed in this study to compute the sediment yield at any point in the watershed. To compute spatially distributed sediment yield map, the RUSLE was first integrated with the ArcView GIS and three area based sediment delivery ratio methods were incorporated in the SATEEC. The SATEEC was applied to the Bangdong watershed, Chuncheon, Gangwon Province to demonstrate how it can be used to estimate soil loss and sediment yield for a watershed. The sediment yield using USDA SDR method is 8,544 ton/year and 4,949 ton/year with the method by Boyce. Thus, use of watershed specific SDR is highly recommended when comparing the estimated sediment yield with the measured sediment data. The SATEEC was applied with hypothetical cropping scenario and it was found that the SATEEC can be used to assess the impacts of different management on the sediment delivered to the stream networks and to find the sediment source areas for a reach of interest. The SATEEC is an efficient tool to find the best erosion control practices with its easy-to-use interface.
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