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Method for Evaluating Damage Caused to Steel Columns by Local Buckling
박연수,강대흥 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.9
In this study the process by which a steel column subjected to strong and repeated loading undergoes failure is investigated. Furthermore, a damage index is developed by using factors related to damage along with a relevant analysis method. A cantilevertype box-type steel member, which is assumed to undergo buckling deformation, is used for the analysis. A nonlinear analysis with repeated displacement control is conducted by applying a compressive load that leads to failure along with a predetermined compressive load to the steel member. The main variables considered in this analysis are the load stock pattern and the type of steel (SS400, SM570, and Posten 80). The influence of each variable on the failure mode, deformation capacity, and damaging process is described. The failure processes for each type of steel are compared. The results indicate that the failure of a steel member under strong repeated loading is governed by local buckling and that the failure of a steel member is directly related to the local strain.
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Crosserase와 crosstalk이 DVD 재생 신호에 미치는 영향
박연수,김지원,조순철,Park, Yeon-Soo,Kim, Ji-Won,Jo, Soon-Chul 대한전자공학회 2001 電子工學會論文誌-CI (Computer and Information) Vol.38 No.4
고밀도 기록매체인 DVD RAM 시스템에서 단면 기록밀도 4.7 GB, 15 GB 매체 개발 실현에 가장 큰 걸림돌로 작용하고 있는 crosserase 및 crosstalk 현상이 재생 신호에 미치는 영향을 분석하기 위해 4.7 GB 및 15 GB 규격으로 재생 신호를 시뮬레이션 하였다. 디스크에 조사된 빔의 강도는 Gaussian으로 근사화하고 기록된 마크는 타원형 마크로 가정하였으며, 재생신호는 Gaussian 빔 패턴과 마크 패턴의 이중 적분으로 계산되었다. Crosserase 정도를 변하여 얻어진 재생 신호로부터 주파수 분석을 통하여 3T-11T 마크의 carrier level의 크기를 구하여 비교하였다. 1,000개의 3T-11T 랜덤 마크로 부터 crosserase 및 crosstalk 에 의한 지터를 계산하여 비교한 결과, crosserase에 의한 지터가 crosstalk에 의한 지터 보다 상대적으로 작음을 확인할 수 있었다. Readout signal of high density DVD-RAM disk output was simulated to analyze the effect of crosserase and crosstalk to the readout signal which is one of the main difficulties to realize high density DVD-RAM system having single side recording density of 4.7 G13 and 15 G13 media. Laser beam intensity impinged on the disk was approximated as Gaussian and recorded marks were assumed elliptical and the readout signal was calculated as a two dimensional convolution of laser beam pattern and recored mark pattern. From the readout signal obtained by varying crosserase ratio, carrier levels with period of 3T to 11 T were calculated and compared. Jitter due to crosserase and crosstalk was calculated and compared using 1,000 random marks having 3T to 11T period. The results showed that the jitter due to crosserase turned out to be smaller than the jitter due to crosstalk.
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