When steel members are corroded, both static and dynamic load carrying capacities are damaged. Static load carrying capacity is easily evaluated because it is only effected by the minimum cross sectional area. However, dynamic load carrying capacity is not easily evaluated because it is effected by distribution of stress and the distribution of stress is not easy to measure. To prevent fracture, it is important to investigate highly stressed region when corrosion occur. In this study, a simple evaluation method for stress concentration factor directly from corroded surface to simply evaluate dynamic load carrying capacity.

Little attention has been paid to the functional aspect of the flower petal of Paeonia lactiflora, compared to that of its root. To determine the components of flower petal of Paeonia lactiflora, we conducted the Fourier transform ion cyclotron resonance (FT-ICR) MASS spectrophotometric analysis. We detected the 24 different types of ingredients from the 70% ethanol extracts of flower petal of peonia lactiflora cv. ‘Red Charm’. The main compounds were quercetin glucopyranosides, methyl gallate, paonioflolol and kaemperol glucopyranosides. We further tested its functional activity. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity of the extracts was 87.9-90.4% at 0.1mg/ml. This result showed that these flower extracts have approximately 5-fold stronger antioxidant potential than a previous report with root extracts (Bang et al. 1999). The result of tyrosinase inhibition assay of Paeonia lactflora extract was almost similar to that of arbutin except significantly higher effect in the coral sunset extract at 0.1% concentration. Hyaluronidase inhibition assay showed 76.5% inhibition at 5% concentration of this flower extract, indicating that Peaonia lactiflora flower extracts have the major anti-inflammatory, anti-oxidant and brightening effects. Taken together, these results suggest these three Paeonia lactiflora species extracts might provide the basis to develop a new natural brightening agent.

본 논문은 EUROFIX 시스템에 적용하기 위한 Reed-Solomon 코딩에 대해서 다룬다. EUROFIX는 최근에 위성시스템의 비상수단으로서 인식되는 LORAN-C 시스템을 이용하여 DGNSS(Differential Global Navigation Satellite Systems) 정보를 전송하는 통합위치결정 시스템으로서, LORAN-C 신호 펄스열들의 펄스 위치 변조에 의한 LORAN-C 전송을 통해서 데이터 통신을 한다. 또한 통신 시스템에서 처리되는 광대한 양의 데이터에 대한 오류론 제어하기 위한 수단으로 오류 정정 부호나 정정 알고리즘이 대두되었으며, 실제로 중요한 적용요소가 되고 있다. 이에 따라 본 논문에서는 EUROFIX 정보전송의 부호화과정에서의 오류정정을 위해서 유한체 푸리에 변환을 이용한 Reed-Solomon 코드의 부호화 및 복호화에 대해서 연구하였다. 시뮬레이션을 통해서, EUROFIX 정보전송의 오류정정에 효과적인 것을 알 수 있었다.