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Experimental study on reinforced concrete filled circular steel tubular columns
Wei Hua,Hai-Jun Wang,Akira Hasegawa 국제구조공학회 2014 Steel and Composite Structures, An International J Vol.17 No.4
Experimental results of 39 specimens including concrete columns, RC columns, hollow steel tube columns, concrete filled steel tubular (CFT) columns, and reinforced concrete filled steel tubular (RCFT) columns are presented. Based on the experimental results, the load-carrying capacity, confined effect, ductility, and failure mode of test columns are investigated. The effects of the main factors such as width-thickness ratio (the ratio of external diameter and wall thickness for steel tubes), concrete strength, steel tube with or without rib, and arrangement of reinforcing bars on the mechanical characteristics of columns are discussed as well. The differences between CFT and RCFT are compared. As a result, it is thought that strength, rigidity and ductility of RCFT are improved; especially strength and ductility are improved after the peak of load-displacement curve.
Simulated Long-Term Vegetation–Climate Feedbacks in the Tibetan Plateau
Wei Hua,Zouxin Lin,Donglin Guo,Guangzhou Fan,Yongli Zhang,Kaiqin Yang,Qin Hu,Lihua Zhu 한국기상학회 2019 Asia-Pacific Journal of Atmospheric Sciences Vol.55 No.1
The Tibetan Plateau (TP) is an important region of land–atmosphere interactions with high climate variability. In this study, an atmosphere–vegetation interaction model was applied to explore the possible responses of vegetation to climate warming, and to assess the impacts of land cover change on the land surface physical processes across the TP. Results showed that long-term warming over the TP could influence vegetation growth via different mechanisms. Most likely, increased temperature would enhance the physiological activity in most high cold areas on the TP, whereas high temperature would inhibit vegetation growth by increasing respiration in areas with favorable water and temperature conditions. In addition, for areas where the climate is warmer but not wetter, higher temperature could influence photosynthesis via the moisture condition of the vegetation rather than by modulating respiration. Numerical simulations demonstrated that vegetation could control the land surface–atmosphere energy balance effectively. The change of land cover from vegetated land to desert steppe decreased the net radiation absorbed by the surface, weakening the surface thermal effects, and reducing sensible and latent heat fluxes. Furthermore, sensitivity simulations also revealed that global warming would likely accelerate vegetation growth in most areas of the TP, resulting in increased surface heat flux.
What Leads to Customer Satisfaction and Repurchase Intention in Taobao.com?
Weihua Wang,Saebum Kim 한국인터넷전자상거래학회 2016 인터넷전자상거래연구 Vol.16 No.2
The purpose of this paper is to investigate the Taobao.com’s consumer behavior and to find out the effects of Taobao.com’s service quality, product factor and price factor on customer satisfaction and repurchase intention. For the purpose we collected and analyzed data via a Web-based questionnaire survey. This paper also investigates the moderating effect of online shopping experience on the way. The results reveal that: first, customer satisfaction positively affects repurchase intention in Taobao.com; second, online shopping experience has a moderating effect on relationship between service and customer satisfaction; service and repurchase intention; and satisfaction and repurchase intention.
Privacy Protection Method for Sensitive Weighted Edges in Social Networks
( Weihua Gong ),( Rong Jin ),( Yanjun Li ),( Lianghuai Yang ),( Jianping Mei ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.2
Privacy vulnerability of social networks is one of the major concerns for social science research and business analysis. Most existing studies which mainly focus on un-weighted network graph, have designed various privacy models similar to k-anonymity to prevent data disclosure of vertex attributes or relationships, but they may be suffered from serious problems of huge information loss and significant modification of key properties of the network structure. Furthermore, there still lacks further considerations of privacy protection for important sensitive edges in weighted social networks. To address this problem, this paper proposes a privacy preserving method to protect sensitive weighted edges. Firstly, the sensitive edges are differentiated from weighted edges according to the edge betweenness centrality, which evaluates the importance of entities in social network. Then, the perturbation operations are used to preserve the privacy of weighted social network by adding some pseudo-edges or modifying specific edge weights, so that the bottleneck problem of information flow can be well resolved in key area of the social network. Experimental results show that the proposed method can not only effectively preserve the sensitive edges with lower computation cost, but also maintain the stability of the network structures. Further, the capability of defending against malicious attacks to important sensitive edges has been greatly improved.
M-ary Bi-orthogonal Modulation UWB with Narrowband Interference Suppression Capability
Weihua Zhang,Hanbing Shen,Jong Ok Joo,곽경섭 한국전자통신연구원 2008 ETRI Journal Vol.30 No.1
An M-ary bi-orthogonal modulation scheme for ultra-wideband (UWB) systems capable of narrowband interference (NBI) suppression is proposed in this letter. We utilize a set of bi-orthogonal pulse series to achieve NBI suppression. Through analysis and simulation, we verify that the proposed scheme can suppress NBIs effectively.
Weihua Ni,Xu Zhang,Bo Wang,Yan Chen,Han Han,Yuying Fan,Yifa Zhou,Guihua Tai 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.2
A neutral polysaccharide fraction (WGPN) prepared from Panax ginseng C.A. Meyer by hot water extraction and DEAE-cellulose chromatography was tested for its anticancer activity alone and in combination with 5-fluorouracil (5-FU) in Sarcoma-180 (S180) tumor-bearing mice by intragastric administration. WGPN alone inhibited S180 tumor growth in a bell-shaped dose–response curve, and the combination with 5-FU showed a synergistic effect. Studies of various immunological activities in S180-bearing mice revealed that WGPN stimulated the proliferation of lymphocytes, increased natural killer cell cytotoxicity, enhanced the phagocytosis and nitric oxide production by macrophages, and increased the level of tumor necrosis factor-α in serum. In combination with 5-FU, WGPN mitigated damage to the immune system caused by 5-FU in S180-bearing mice. These results suggest that WGPN might be a potential adjuvant for chemotherapeutic drugs.
Weihua Zhou,Yanbo Wangy,Zhe Chen 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a vector fitting (VF) algorithmbased gray-box structure and parameters identification method for voltage source converter(VSC). Terminal impedance frequency responses of VSC is first measured by frequency scanning method. Then, these impedance frequency responses are fitted by a polynomial transfer function using VF algorithm. Finally, the theoretical terminal impedance formulas of possible control structures are compared with the fitted transfer function. The actual control structure can be selected, and the actual internal parameters can be identified. Simulation results are given to validate effectiveness of the proposed method. The proposed gray-box method can identify both the circuit and controller information even if no internal information of the VSC is provided by vendors due to industrial confidence. In addition, the effect of measurement noise on parameters identification accuracy can be mitigated by increasing the order of the fitted transfer function.
Weihua Liang,Yitao Liu,Shiqi Jiang,Jianchun Peng,Hui Jiang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The energy stored quasi-Z source cascaded Hbridge (ES-qZS-CHB) inverter is widely used in photovoltaic (PV) power generation system because of its unique advantages. However, the existing researches on ESqZS-CHB inverter PV power system mainly focus on the transmission of active power, but pay little attention to reactive power, causing the ES-qZS-CHB inverter PV power system cannot compensate reactive power or improve system performance. This paper proposes a PV power generation and static synchronous compensator based ESqZS-CHB inverter system, to implement the PV generation and reactive power compensation at the same time. Simulation and experimental results verify the system’s excellent performance.