A time-varying propagation model of hot topic on BBS sites and Blog networks

2012 ◽  
Vol 187 ◽  
pp. 15-32 ◽  
Author(s):  
Beibei Zhang ◽  
Xiaohong Guan ◽  
Muhammad Junaid Khan ◽  
Yadong Zhou
Keyword(s):  
Propagation Model ◽  
Time Varying

scholarly journals Hot Topic Propagation Model and Opinion Leader Identifying Model in Microblog Network

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Yan Lin ◽  
Huaxian Li ◽  
Xueqiao Liu ◽  
Suohai Fan
Keyword(s):  
Opinion Leader ◽  
Propagation Model ◽  
Opinion Leaders ◽  
Time Varying ◽  
Propagation Characteristics ◽  
Propagation Process ◽  
Ahp Model ◽  
Healthy Development ◽  
Undirected Network ◽  
The Social

As the network technique is fast developing, the microblog has been a significant carrier representing the social public opinions. Therefore, it is important to investigate the propagation characteristics of the topics and to unearth the opinion leaders in Micro-blog network. The propagation status of the hot topics in the Micro-blog is influenced by the authority of the participating individuals. We build a time-varying model with the variational external field strength to simulate the topic propagation process. This model also fits for the multimodal events. The opinion leaders are important individuals who remarkably influence the topic discussions in its propagation process. They can help to guide the healthy development of public opinion. We build an AHP model based on the influence, the support, and the activity of a node, as well as a microblog-rank algorithm based on the weighted undirected network, to unearth and analyze the opinion leaders’ characteristics. The experiments in the data, collected from the Sina Micro-blog from October 2012 to November 2012 and from January 2013 to February 2013, show that our models predict the trend of hot topic efficiently and the opinion leaders we found are reasonable.

scholarly journals Study of the Influences of Transient Crack Propagation in a Pinion on Time-Varying Mesh Stiffness

2016 ◽  
Vol 2016 ◽  
pp. 1-13
Author(s):  
Youmin Hu ◽  
Jikai Fan ◽  
Jin Yu
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Propagation Model ◽  
Time Varying ◽  
Mesh Stiffness ◽  
Propagation Models ◽  
Material Fatigue ◽  
Stiffness Variation ◽  
Short Time ◽  
Potential Energy Method

Cracks in a cracked gear may further propagate by a tiny length in a very short time for several reasons, such as material fatigue and load fluctuations. In this paper, this dynamic process is defined as transient propagation of cracks. This research aims to calculate the time-varying mesh stiffness of gears when transient propagation of cracks arises, which has not been extensively studied in existing literatures. The transient propagation of cracks is modelled. An improved potential energy method is proposed by incorporating the propagation model into the potential energy method. The improved method can also be utilised to calculate the mesh stiffness of gears when transient propagation of cracks arises. Different transient propagation models are considered to simulate the propagation of cracks in a short amount of time. Different deterioration levels of cracks before transient propagation and different lengths and models of transient propagation are also examined. The variation rules of mesh stiffness caused by the transient propagation of cracks are summarised. The influence of the deterioration level of cracks on mesh stiffness variation when transient propagation arises is obtained. Simulation results show that the proposed method accurately calculates time-varying mesh stiffness when transient propagation of cracks arises. Furthermore, the method improves the monitoring of further propagation of cracks in gears from the perspective of time-varying mesh stiffness.

Time-varying Macroeconomic Risk of Real Estate Returns

2016 ◽  
Author(s):  
Felix Schindler ◽  
Bertram Steininger ◽  
Tim Kroencke
Keyword(s):  
Real Estate ◽  
Time Varying ◽  
Macroeconomic Risk ◽  
Real Estate Returns
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