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Gang Chen,Yu Jin,Jing Wang,Cheng Zhang,Qiang Chen,Hongming Zhang,Xingjian Zhao,Zhiyong Li,Changhai Xie,Zhiming Du 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Isothermal compression tests were carried out to study the hot deformation behavior of T2 copper under various conditions. The deformation parameters, such as temperature and strain rate, have strong influence on flow stress and microstructureevolution of the alloy. A unified dislocation density-based model considering dynamic recovery and recrystallization wasestablished. And material parameters of the developed model were optimized by genetic algorithm. Comparisons betweenthe experimental and model data demonstrates that the developed model can precisely describe the flow behavior at quitewide range of deformation conditions. Meanwhile, the designed iterative procedure allows the model to be applied in timevariantdeformation conditions. Processing map and microstructure examination were constructed to optimize the processingwindow of the studied alloy. According to the processing maps, flow instability mainly appeared at low temperatures of500–650 °C and strain rates higher than 0.1 s−1. The optimum deformation parameters of T2 copper was concluded as thetemperature range of 700–800 °C and the strain rate of 0.1–1 s−1.
Gang Chen,Hua Wang,Jun-Yi Gai,Yue-Lin Zhu,Li-Fei Yang,Qian-Qian Liu,Gong-Chen Zhang,Guo-Hu Chen 한국원예학회 2012 Horticulture, Environment, and Biotechnology Vol.53 No.2
The objectives of this paper were to construct a full-length cDNA library and to isolate genes that confer salt tolerance from the leaves of salinity-tolerant wild eggplant variety, ‘Torvum Vigor’ (Solanum torvum Swartz). A full-length cDNA library from the leaves was successfully constructed by a switching mechanism at 5’-end of RNA transcript (SMART) approach and a long-distance PCR (LD-PCR) technique. The titer of the primary cDNA library was 3.6 ×106 cfu・mL-1 and that of the amplified library was 1.2 × 1010 cfu・mL-1. Gel electrophoresis results showed that most of the cDNA inserts ranged from 0.40 to 2.5 kb, with a recombination rate of 99%. A total of 427 randomly selected positive clones were sequenced. After removing the unsuccessful reads, 364 datasets were obtained and have been submitted to the NCBI Nucleotide Sequence Database under GenBank accession numbers JK265131-JK265494. Among the 364 submitted sequences, 74.45% of them contained full-length coding regions. BLASTX analysis revealed that 62.36% of the ‘Torvum Vigor’ expressed sequence tags (ESTs) possessed homology to known or putative proteins of other organisms. Seven genes that might be responsible for the encoding of known proteins in other organisms were identified to confer salt tolerance. This evidence demonstrated that the cDNA library constructed was a full-length library of high quality. It could be a useful resource for further research in the cloning of stress-related genes, which could be utilized in the genetic improvement of vegetable crops using transgenic technology.
TREES WITH EQUAL STRONG ROMAN DOMINATION NUMBER AND ROMAN DOMINATION NUMBER
Chen, Xue-Gang,Sohn, Moo Young Korean Mathematical Society 2019 대한수학회보 Vol.56 No.1
A graph theoretical model called Roman domination in graphs originates from the historical background that any undefended place (with no legions) of the Roman Empire must be protected by a stronger neighbor place (having two legions). It is applicable to military and commercial decision-making problems. A Roman dominating function for a graph G = (V, E) is a function $f:V{\rightarrow}\{0,1,2\}$ such that every vertex v with f(v)=0 has at least a neighbor w in G for which f(w)=2. The Roman domination number of a graph is the minimum weight ${\sum}_{v{\in}V}\;f(v)$ of a Roman dominating function. In order to deal a problem of a Roman domination-type defensive strategy under multiple simultaneous attacks, ${\acute{A}}lvarez$-Ruiz et al. [1] initiated the study of a new parameter related to Roman dominating function, which is called strong Roman domination. ${\acute{A}}lvarez$-Ruiz et al. posed the following problem: Characterize the graphs G with equal strong Roman domination number and Roman domination number. In this paper, we construct a family of trees. We prove that for a tree, its strong Roman dominance number and Roman dominance number are equal if and only if the tree belongs to this family of trees.
Enhanced Locality Sensitive Clustering in High Dimensional Space
Chen, Gang,Gao, Hao-Lin,Li, Bi-Cheng,Hu, Guo-En The Korean Institute of Electrical and Electronic 2014 Transactions on Electrical and Electronic Material Vol.15 No.3
A dataset can be clustered by merging the bucket indices that come from the random projection of locality sensitive hashing functions. It should be noted that for this to work the merging interval must be calculated first. To improve the feasibility of large scale data clustering in high dimensional space we propose an enhanced Locality Sensitive Hashing Clustering Method. Firstly, multiple hashing functions are generated. Secondly, data points are projected to bucket indices. Thirdly, bucket indices are clustered to get class labels. Experimental results showed that on synthetic datasets this method achieves high accuracy at much improved cluster speeds. These attributes make it well suited to clustering data in high dimensional space.
Gang Yang,Kangwei Chen 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12
Design of complex mechanical equipment and scheme of manufacturing need a comprehensive consideration of constraints, and it embodies multiple layers, complexity, multiple types and uncertainty. This paper analyzes the question of scheme optimization for complex mechanical equipment and proposes a method of manufacturing scheme optimization for complex mechanical equipment based on multi -attribute fuzzy information measurement model. This method functions to build an indicator system of optimization scheme for manufacturing complex mechanical equipment. Three models are designed to evaluate all optimization indicators the system, namely model for computation of fuzzy interval indicator’s information quantity, model for computation of qualitative indicator information quantity and model for computation of fuzzy indicator’s information quantity with degree of membership. Weights are given to information quantity optimization indicators in different layers get total complex mechanical equipment scheme choose optimal strategy based on design manufacture.
Chen, Wen-Jie,He, De-Shen,Tang, Rui-Xue,Ren, Fang-Hui,Chen, Gang Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.2
Ki-67 has been widely used as an indicator of cell proliferation in gliomas. However, the role of Ki-67 as a prognostic marker is still undefined. Thus, we conducted a meta-analysis of the published literatures in order to clarify the impact of Ki-67 on survival in glioma cases. Eligible studies were identified in PubMed, EMBASE, ISI Web of Science, Cochrane Central Register of Controlled Trials, Science Direct and Wiley Online Library with the last search updated on August 31, 2014. The clinical characteristics, overall survival (OS) and progression-free survival (PFS) together with Ki-67 expression at different time points were extracted. A total of 51 studies, covering 4,307 patients, were included in the current meta-analysis. The results showed that overexpression of Ki-67 can predict poor OS (HR=1.66, 95%CI: 1.53-1.80; Z=11.87; p=0.000) and poor PFS (HR=1.67, 95%CI: 1.47-1.91; Z=7.67; p=0.000) in gliomas. Moreover, subgroup analyses also indicated that high level of Ki-67 expression was related to poor OS and PFS in glioma patients regardless of region, pathology type, cut-off value and statistical method. In conclusion, the current meta-analysis revealed that Ki-67 expression might be a predicative factor for poor prognosis of glioma patients, emphasizing its importance as a predictor.
A New Chromone Glycoside from Rhododendron spinuliferum
Gang Chen,Xue Feng Li,Qi Zhang,Hui Zi Jin,Yun Heng Shen,Shi Kai Yan,Wei Dong Zhang 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.8
A new chromone glycoside, 3,5,7-trihydroxylchromone-3-O-α-L-arabinopyranoside (1), together with quercetin (2), (+)-catechin (3), (-)-epi-catechin (4) were isolated from the aerial parts of Rhododendron spinuliferum. The structure of 1 was elucidated on the basis of spectroscopic and 2D-NMR spectral analysis. In addition, 1 exhibited mild inhibitory effect on NO production in LPS-stimulated RAW264.7 cells.
Effect of Heat Treatments on Microstructures and Tensile Properties of Cu–3 wt%Ag–0.5 wt%Zr Alloy
Gang Chen,ChuanJie Wang,Ying Zhang,Cen Yi,Peng Zhang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
The microstructures and tensile properties of Cu–3 wt%Ag–0.5 wt%Zr alloy sheets under different aging treatments areinvestigated in this research. As one kind of precipitate, Ag nanoparticles with coherent orientation relationship with matrixprecipitate. However, after the peak-age point, most of Ag nanoparticles grow into short rod shape with the interface translatingto semi-coherent, which leads to the lower strength of over-aging sample. The yield strength is estimated by consideringsolid solute, grain boundary and precipitation strengthening mechanisms. The result shows that the Ag precipitates providethe main strengthening role. Then a constitutive equation representing the evolution of dislocation density with plastic strainis built by considering work-hardening behavior coming from shearable and non-shearable precipitates which is mainly theparticles containing Zr. The flow stress contributed by shearable particle hardening is higher than that of non-shearable one. Due to the coarsening of grain boundary precipitates and low rate of damage accumulation of these non-shearable particles,the micro-cracks nucleate easily at grain boundary which leads to intergranular fracture.
Enhanced Locality Sensitive Clustering in High Dimensional Space
Gang Chen,Hao-Lin Gao,Bi-Cheng Li,Guo-En Hu 한국전기전자재료학회 2014 Transactions on Electrical and Electronic Material Vol.15 No.3
A dataset can be clustered by merging the bucket indices that come from the random projection of locality sensitivehashing functions. It should be noted that for this to work the merging interval must be calculated first. To improvethe feasibility of large scale data clustering in high dimensional space we propose an enhanced Locality SensitiveHashing Clustering Method. Firstly, multiple hashing functions are generated. Secondly, data points are projected tobucket indices. Thirdly, bucket indices are clustered to get class labels. Experimental results showed that on syntheticdatasets this method achieves high accuracy at much improved cluster speeds. These attributes make it well suited toclustering data in high dimensional space.