نتایج جستجو برای: network effects
تعداد نتایج: 2173919 فیلتر نتایج به سال:
In this paper I discuss economic processes that may give rise to spatial patterns in data, and explore the relative merits of alternative modeling approaches when data are spatially correlated. Specifically, I present an estimation scheme that allows for spatial random effects, and focus attention on cases in which such a framework may be preferred to the more general fixed effects framework th...
Introduction of new technologies such as energy storage systems, electric vehicles, and distributed generation improved the characteristics of networks. On other hand, using these components in distribution systems improves system performances such as power losses. One of effective methods for improving system characteristics is distribution network reconfiguration. In this study, in addition t...
Knowledge network is one of the new strategies of knowledge management and it,s rationale of it is create synergy effects through a combination of effective human resources knowledge workers and knowledge bases of allied companies. Today, the face of complex structural issues and various stakeholders,s views to it, leading to increase use of software systems, particularly in managerial issues t...
Network of connections is an informal institution, which affects agents’ decisions as well as their outcomes. Dominant neoclassical paradigm has neglected the role of connections and links, due to its atomistic view, while social networks can play a crucial role with regards to economic and social phenomena, such as migration, job finding, crime network, learning, financial crisis contagion, mi...
Introduction: Population ageing has turned its health impact into a critical problem. Iran will soon encounter such a crisis, but the capacity of social networks can be helpful in controlling this crisis. The present study was conducted to analyze the relationship of the social networks of the aged with health impact from the health and health services Utilization points of view. Method: In a s...
In this research samples of PVOH were synthesized at various reaction conditions (temperature, time, and amount of catalyst). First at 25˚C and 45˚C and constant catalyst weight samples of PVOH were prepared with different degree of hydrolysis at various times. For investigation of the effects of temperature, at times 20 and 40 min and constant weight of catalyst PVOH was prepared at various te...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
The precipitation of asphaltene, one of the components of oil, in reservoirs, transfer lines, and equipment causes many problems. Accordingly, researchers are prompted to determine the factors affecting asphaltene precipitation and methods of avoiding its formation. Predicting precipitation and examining the simultaneous effect of operational variables on asphaltene precipitation are difficult ...
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