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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.
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.
Weihua Yang,Xiangli Li,Xue Liu 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.5
An experiment was designed at the curving section of a combustion chamber to study the effects of cooling effectiveness on impingement-reversed convection film cooling with and without pin fins. Numerical simulations were also carried out. The effectiveness of compound cooling increased with the rise in blowing ratio. With regard to the effect of the pin fins, impingement pin fin-reversed convectionfilm cooling was more effective than the method without pin fins, particularly for smaller blowing ratio conditions. The number and arrangement of fin pin rows had a small effect on cooling efficiency under the same blowing ratio value. Simulation results agreed well with experimental data and could be used to optimize basic design.
A Novel Task Communication and Scheduling Algorithm for NoC-based MPSoC
Weihua Zhang,Gengxin Sun,Sheng Bin 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.10
With the high performance demand, recent embedded systems are mostly based on NoC (Network-on-Chip) architectures, which would bring complex on-chip communication and scheduling problems. In this paper, a novel task scheduling algorithm which statically schedules both communication transactions and computation tasks onto heterogeneous NoC architectures under real-time constraints is presented. Our algorithm is capable of assigning tasks onto different processing elements (PE) automatically and scheduling their execution. We map tasks onto an 8× 8 NoC-based MPSoC to show that our scheduling algorithm leads to reduction in the total execution time, energy consumption. Experimental results show that for a multimedia application, more than 40% energy savings have been observed compared to the schedules generated by a standard scheduler.
Robust mixed H_2/H_∞ guaranteed cost control of uncertain stochastic neutral systems
Weihua Mao,Feiqi Deng,Anhua Wan 한국전산응용수학회 2012 Journal of applied mathematics & informatics Vol.30 No.5
In this paper, we deal with the robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost control problem involving uncertain neutral stochastic distributed delay systems. More precisely, the aim of this problem is to design a robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed-cost controller such that the close-loop system is stochastic mean-square exponentially stable, and an $H_2$ performance measure upper bound is guaranteed, for a prescribed $H_{\infty}$ attenuation level $\gamma$. Therefore, the fast convergence can be fulfilled and the proposed controller is more appealing in engineering practice. Based on the Lyapunov-Krasovskii functional theory, new delay-dependent sufficient criteria are proposed to guarantee the existence of a desired robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which are derived in terms of linear matrix inequalities (LMIs). Furthermore, the design problem of the optimal robust mixed $H_2\hbox{/}H_{\infty}$ guaranteed cost controller, which minimized an $H_2$ performance measure upper bound, is transformed into a convex optimization problem with LMIs constraints. Finally, two simulation examples illustrate the design procedure and verify the expected control performance.
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.
Weihua Li,Yipeng Wang,Junlong Guo,Dianbo Ren,Jianfeng Wang,Shengkai Zhu,Jianping Xiao,Shijuan Chen 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
This study proposes an improved artificial potential field (APF) by considering the cooperative control of local obstacle avoidance and path tracking for automated vehicles. We established the path gravitational potential field (GPF) based on the scheduled path (SP), including the lateral and longitudinal GPFs, to enable the automated vehicle to quickly return to the SP and track after obstacle avoidance, while maintaining control of speed for the entire process. To address the local optimal solution problem of the classical APF, we proposed a sub-target-point selection strategy based on the information of obstacles and SP and established the GPF of the sub-target points. Thus, the automated vehicle can avoid obstacles and quickly return to the SP. Furthermore, the relative velocity of the automated vehicle and the obstacle was used to establish the velocity repulsion potential field (RPF), which improved the adaptability of the APF to dynamic obstacles. The simulation results indicate that the improved APF is capable of cooperative control of path tracking and local obstacle avoidance. Code is available at https://github.com/xiaowang617/Improve-APF.
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.