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Buckling Analysis of Steel H Column with Thermal Gradient Along the Flanges
Wei-bin Yuan,Pei-jun Ge,Yue-ting Shen,Shan-shan Cheng,Nan-ting Yu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.2
This paper presents an analytical study about the axial compression buckling of H-section columns with one side of the flanges exposed to fire. The fire-induced thermal gradient along the flanges is obtained by using simplified Fourier heat conduction equation. The pre-buckling stress and bowing effect due to the non-uniform temperature distribution through the cross-section is considered. The analysis is accomplished by using the Rayleigh–Ritz method. The analytical solution is validated by finite element analysis using ANSYS. Finally, the parametric study is performed for different sections including different values of length, thickness ratio and width-to-height ratio.
Yuan-Yuan HU,이양기,Wei-Lun Fu 한국아시아학회 2022 아시아연구 Vol.25 No.1
The 2020 COVID-19 pandemic has impacted the global development in economic, political, social and others, as well as promoting countries to reflect on the direction of economic transition. Post-pandemic green economic recovery has become the consensus of the global, but it puts pressure on the challenges to response to global climate change. Thus, the development of renewable energy represented by solar photovoltaic(PV) industry has once again received strong support from all countries. China has abundant solar energy resources and has listed the solar PV industry as one of the national strategic emerging industries. China's solar PV industry has developed rapidly in the past two decades. This article explains the relevant policy of solar PV industry guided by the 14th Five-Year Plan(FYP) as a benchmark and compares its with the 12th/13th FYP policies to show the status of solar PV industry development before and after COVID-19 in China. In addition, under the guidance of the 14th FYP policies, this paper further analyzes the challenges and explores the opportunities of China's solar PV industry development in the post-pandemic era. Finally, this article provides helpful insights for solving the challenges that exist on the pathway to China’s solar PV industry development during the 14th FYP period.
Deflection of Castellated Beams Subjected to Uniformly Distributed Transverse Loading
Wei-bin Yuan,Nan-ting Yu,Zhao-shui Bao,Li-ping Wu 한국강구조학회 2016 International Journal of Steel Structures Vol.16 No.3
This paper presents an analytical solution for determining the deflection of castellated/cellular beams with hexagonal/circular web openings, subjected to a uniformly distributed transverse load. The solution is derived using the principle of minimum potential energy. To validate the derived analytical solution, three-dimensional linear finite element analysis is performed using four-node shell elements built-in ANSYS software. Good agreement between the finite element result and the present analytical solution is demonstrated.
Wei Zhao,Zhi-Gang Yuan,Yue-hong Shen,Yufan Cao,Yimin Wei,Pengcheng Xu,Wei Jian 한국전자통신연구원 2015 ETRI Journal Vol.37 No.4
This paper deals with the problem of blind source separation (BSS), where observed signals are a mixture of delayed sources. In reference to a previous work, when the delay time is small such that the first-order Taylor approximation holds, delayed observations are transformed into an instantaneous mixture of original sources and their derivatives, for which an extended second-order blind identification (SOBI) approach is used to recover sources. Inspired by the results of this previous work, we propose to generalize its first-order Taylor approximation to suit higher-order approximations in the case of a large delay time based on a similar version of its extended SOBI. Compared to SOBI and its extended version for a first-order Taylor approximation, our method is more efficient in terms of separation quality when the delay time is large. Simulation results verify the performance of our approach under different time delays and signal-to-noise ratio conditions, respectively.
Yuan Wei,Shulin Liu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
To minimize leakage and maintain the efficiency of turbomachinery, brush seal can be installed with zero clearance or interference as the flexibility. This leads to contact between the rotor and bristle pack, and may cause self-excited vibration, even instability. In this study, to establishment a mathematical model of the rotor system, a seal force model with bristle interference is proposed and the nonlinear oilfilm force is applied in view of short bearing assumption. The influences of main factors containing rotor rotational speed, installing interval, disc mass, and disk eccentricity on the nonlinear characteristics of the rotor-bearing-brush seal system are conducted by adopting bifurcation diagram, spectrum cascade, axis orbit, and Poincaré map. The results indicate that the vibration amplitude of the system with bristle interference is a bit larger than that without interference. The system stability is enhanced with smaller disk mass at a higher rotational speed. The proposed model could provide valuable reference for the design of a rotor-bearing-seal system.
Wei-bin Yuan,Yue-ting Shen,Nan-ting Yu,Zhao-shui Bao 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
This paper presents an analytical approach to predict the critical load of global buckling with locally buckled channel-section columns under axial compressive loads. The eff ect of local deformation before global buckling is considered. The analysis is performed by using the Rayleigh–Ritz method. The analytical solution is validated by using the nonlinear fi nite element analysis method. Parametric study is also performed for diff erent sections including diff erent values of slenderness ratio, height-thickness ratio and width-height ratio. The comparison between the present approach and those taken from Chinese and American standards demonstrates that the present model provides a good approach for predicting the critical loads of steel columns involving local and global buckling interaction.
The dynamic transcriptome of waxy maize (Zea mays L. sinensis Kulesh) during seed development
Wei Gu,Diansi Yu,Yuan Guan,Hui Wang,Tao Qin,Pingdong Sun,Yingxiong Hu,Jihui Wei,Hongjian Zheng 한국유전학회 2020 Genes & Genomics Vol.42 No.9
Background Waxy maize (Zea mays L. sinensis Kulesh) is a mutant of maize (Zea mays L.) with a mutation at Waxy1 (Wx1) gene locus. The seed of waxy maize has higher viscosity compared to regular maize. By now, we know little about the expression patterns of genes that involved in the seed development of waxy maize. Objective By analyzing the transcriptome data during waxy maize seed development, we attempt to dig out the genes that may infuence the seed development of waxy maize. Methods The seeds of waxy maize inbred line SWL01 from six phases after pollination were used to do RNA-seq. Bioinformatics methods were used to analyze the expression patterns of the expressed genes, to identify the genes involved in waxy maize seed development. Results A total of 24,546 genes including 1611 transcription factors (TFs) were detected during waxy maize seed development. Coexpression analysis of expressed genes revealed the dynamic processes of waxy maize seed development. Particularly, 2457 genes including 177 TFs were specially expressed in waxy maize seed, some of which mainly involved in the process of seed dormancy and maturation. In addition, 2681, 5686, 4491, 4386, 3669 and 4624 genes were identifed to be diferential expressed genes (DEGs) at six phases compared to regular maize B73, and 113 DEGs among them may be key genes that lead the diference of seed development between waxy and regular maizes in milk stage. Conclusion In summary, we elucidated the expression patterns of expressed genes during waxy maize seed development globally. A series of genes that associated with seed development were identifed in our research, which may provide an important resource for functional study of waxy maize seed development to help molecular assisted breeding.
중국 IP(Intellectual Property)영화 작품의 창작 트렌드
Wei, Si-Yuan,Song, Seung-Keun 한국정보통신학회 2020 한국정보통신학회논문지 Vol.24 No.2
Recently, IP (Intellectual Property) films have attracted much attention in the Chinese film market. This raises the need to take intellectual property films seriously in academic terms. The purpose of this study is to explore the effective methodology of content development based on intellectual property by analyzing the recent trend of Chinese intellectual property films. Recently, the driving force of the development of Chinese intellectual property films was analyzed, and the trend of Chinese intellectual property films was analyzed. The results of this study criticized the fragmented problems caused by the development of intellectual property films. This study made practical and academic suggestions to contribute to the healthy development of the intellectual property film market.