scholarly journals Recurrence/transience criteria for skew product diffusion processes

2011 ◽  
Vol 87 (7) ◽  
pp. 119-122
Author(s):  
Tomoko Takemura ◽  
Matsuyo Tomisaki
Keyword(s):  
Diffusion Processes ◽  
Skew Product ◽  
Product Diffusion

Convergence of Time Changed Skew Product Diffusion Processes

2011 ◽  
Vol 38 (1) ◽  
pp. 31-55 ◽  
Author(s):  
Tomoko Takemura
Keyword(s):  
Diffusion Processes ◽  
Skew Product ◽  
Product Diffusion

On the Skew Product of Symmetric Diffusion Processes

1989 ◽  
Vol 1 (1) ◽  
Author(s):  
Masatoshi Fukushima ◽  
Yoichi Oshima
Keyword(s):  
Diffusion Processes ◽  
Skew Product ◽  
Symmetric Diffusion

scholarly journals Agent-Based Simulation of Product Diffusion with Network Externality in a Heterogeneous Consumer Network

2011 ◽  
Vol 15 (2) ◽  
pp. 173-179 ◽  
Author(s):  
Nobutada Fujii ◽  
◽  
Toshiya Kaihara ◽  
Takashi Eda ◽  
Keyword(s):  
Complex Networks ◽  
Multiagent Systems ◽  
Diffusion Processes ◽  
Product Market ◽  
Network Externality ◽  
Threshold Models ◽  
Product Diffusion ◽  
Consumer Heterogeneity ◽  
Agent Based ◽  
Simulation Results

In a product market with network externality, outperforming products are not always disseminated. Product markets are often modeled and examined by simulation to clarify product diffusion processes. In earlier work, where multiagent systems and complex networks were used to model the product market, consumer heterogeneity was not considered despite its influence on the product diffusion process. This paper introduces threshold models into multiagent-systembased simulation in complex networks to realize consumer heterogeneity. The feasibility of the proposed method is discussed using computer simulation results, and consumer heterogeneity and network structure affect product diffusion processes.

Marketing investment and pharmaceutical product diffusion

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiaoyan Qian ◽  
Hao Yin ◽  
Xiaotong Li
Keyword(s):  
Critical State ◽  
Diffusion Processes ◽  
Drug Market ◽  
Pharmaceutical Product ◽  
Bass Model ◽  
Product Diffusion ◽  
Content Type ◽  
Drug Diffusion ◽  
Diffusion Characteristics ◽  
Generalized Bass Model

PurposeThis paper aims to explore the influence of marketing investment on drug diffusion processes, to analyze the heterogeneity of the diffusion characteristics and to understand the drug diffusion patterns in the prescription and over-the-counter (OTC) markets.Design/methodology/approachThe study introduces marketing investment into the Bass model. The authors use the Generalized Bass Model (GBM) to examine the influence of marketing efforts on drug diffusion in Chinese prescription and OTC markets.FindingsThe results of this study suggest that the imitation effect in the prescription drug market is greater than that in the OTC drug market; drug diffusion in the OTC market reaches saturation earlier in the diffusion process. Before reaching the critical state, the effect of marketing investment on drug diffusion in the OTC market is greater than that in the prescription market, and after the critical state, drug diffusion in the prescription market is more sensitive to marketing investment.Originality/valueThe study demonstrates the value of the GBM in empirical analyses of drug diffusion across two distinct markets, and the marketing regulation policies governments adopt have a powerful impact on the speed at which drugs become available in different markets. It enriches the extant product diffusion literature by highlighting the different diffusion patterns of the two segments of pharmaceutical market.

Meridional Circulation, Turbulence, and Diffusion Processes in Stars

1976 ◽  
Vol 32 ◽  
pp. 109-116 ◽  
Author(s):  
S. Vauclair
Keyword(s):  
Convection Zone ◽  
Diffusion Processes ◽  
Meridional Circulation ◽  
Diffusion Time ◽  
Work In Progress ◽  
First Results ◽  
Stellar Envelopes ◽  
And Diffusion ◽  
Turbulence And Diffusion ◽  
Hr Diagram

This paper gives the first results of a work in progress, in collaboration with G. Michaud and G. Vauclair. It is a first attempt to compute the effects of meridional circulation and turbulence on diffusion processes in stellar envelopes. Computations have been made for a 2 Mʘstar, which lies in the Am - δ Scuti region of the HR diagram.Let us recall that in Am stars diffusion cannot occur between the two outer convection zones, contrary to what was assumed by Watson (1970, 1971) and Smith (1971), since they are linked by overshooting (Latour, 1972; Toomre et al., 1975). But diffusion may occur at the bottom of the second convection zone. According to Vauclair et al. (1974), the second convection zone, due to He II ionization, disappears after a time equal to the helium diffusion time, and then diffusion may happen at the bottom of the first convection zone, so that the arguments by Watson and Smith are preserved.

Ergodic Control of Diffusion Processes

2009 ◽  
Author(s):  
Ari Arapostathis ◽  
Vivek S. Borkar ◽  
Mrinal K. Ghosh
Keyword(s):  
Diffusion Processes ◽  
Ergodic Control

NMR-Study of Structure and Diffusion Processes in Li3N

1980 ◽  
Vol 41 (C6) ◽  
pp. C6-28-C6-31 ◽  
Author(s):  
R. Messer ◽  
H. Birli ◽  
K. Differt
Keyword(s):  
Diffusion Processes ◽  
Nmr Study ◽  
And Diffusion
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