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[박막의 부식, 방식 및 마모 거동] CaO 첨가와 열간압연이 마그네슘 합금의 고온산화에 미치는 영향
Chunyu Xu,Trinh Van Trung,원성빈(Sung-Bin Won),이동복(Dong Bok Lee) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.4
Magnesium alloys of AZ31, AZ31 + (0.5, 1, 1.5)wt.% CaO were cast, hot rolled, and oxidized between 450 and 650℃ in atmospheric air. The added CaO enabled to cast the AZ31 alloy in air. It decomposed and precipitated along the grain boundaries of the AZ31 alloy as Al2Ca. The more the amount of CaO was, the more Al₂Ca formed. The oxidation limit was about 450℃ for the AZ31 alloy. But, It increased to 650℃ in the CaO-added alloys. Hot rolling destroyed the precipitates that formed along the grain boundaries of the AZ31 alloy. During oxidation, MgO oxide scales that incorporated CaO formed at the outer surface of the formed oxide layer.
Content-Based Image Retrieval Improved by Incorporating Semantic Annotation via Query Expansion
Guoqing Xu,Jian Li,Chunyu Xu,Qi Wang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.12
Automatic image annotation (AIA) is expected to be a promising way to improve the performance of content-based image retrieval (CBIR). However, current image annotation results are always incomplete and noisy, and far from practical usage. In this paper, we incorporate semantic annotations into CBIR via query expansion scheme to improve retrieval accuracy. In the proposed method, semantic annotations of test images are obtained using a visual nearest-neighbor-based annotation model. And both visual features and annotation keywords are used to represent images. The similarity between two images is determined by their visual similarity and semantic similarity. The method is evaluated on the well-known Pascal VOC 2007 dataset using standard performance evaluation metric. The experimental results indicate that the performance of CBIR can be improved by incorporating semantic annotation via query expansion.
Chunyu Zhang,박인애,Fangsen Xu,Maoteng Li,임용표,Jinling Meng 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.4
Lacking P protein of glycine decarboxylase (GDCP) from the mesophyll cells was one of the major steps for C_3species to evolve into C_3-C_4 species. Previous studies indicated that the lack of P protein in the mesophyll cells of C_3-C_4species of Flaveria is regulated by gene different transcription. In the family of Brassicaceae, most plants show a typical C_3photosynthetic characteristic, which includes some important vegetables and oil crops, while few plants in this family exhibit a C_3-C_4 type of character. To understand the mechanism of difference in distribution of P protein between the 2 different photosynthetic types, a C_3 type of 1.6 kb BnGDCP promoter from Brassica napus was used for detailed analysis in this study. This promoter exhibited the ability to drive beta-glucuronidase gene (GUS) expression in both mesophyll and the bundle sheath cells of C_3 species, Arabidopsis. However, the same promoter was also found to drive GUS expression in both the mesophyll and bundle sheath cells of a typical of C_3-C_4 species such as Moricandia arvensis, which loses the P protein from the mesophyll cells. This implies that in absence of P protein from the mesophyll cells of Moricandia (C_3-C_4 species) may be regulated by differential transcription of the P protein gene as well. And then, a region, which determines a mesophyll cells specific expression, was narrowed down to 135 bp in length through detailed promoter/reporter gene assay. DNA sequences alignment of the 5′-flanking sequences from either a C3 or C_3-C_4 species in Brassicaceae indicated that 2 different nucleotide acids only conserved to C_3 species were revealed. Phylogenetic analysis of those 5′-flanking sequences of GDCP indicated that C_3-C_4 species in the genus of Moricandia might have been evolved from different C_3 ancestors; interestingly, a C_3-C_4species, D. tenuifolia, was indicated to have shared common ancestors with the C_3-C_4 species, M. spinosa, and the C_3 species M. foleyii in Moricandia.
Framework for End-to-End Optimal Traffic Control Law Based on Overlay Mesh
Liu, Chunyu,Xu, Ke The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.4
Along with the development of network, more and more functions and services are required by users, while traditional network fails to support all of them. Although overlay is a good solution to some demands, using them in an efficient, scalable way is still a problem. This paper puts forward a framework on how to construct an efficient, scalable overlay mesh in real network. Main differences between other overlays and ours are that our overlay mesh processes some nice features including class-of-service(CoS) and traffic engineering(TE). It embeds the end-to-end optimal traffic control law which can distribute traffic in an optimal way. Then, an example is given for better understanding the framework. Particularly, besides good scalability, and failure recovery, it possesses other characteristics such as routing simplicity, self-organization, etc. In such an overlay mesh, an applicable source routing scheme called hierarchical source routing is used to transmit data packet based on UDP protocol. Finally, a guideline derived from a number of simulations is proposed on how to set various parameters in this overlay mesh, which makes the overlay more efficient.