The main concern of this paper is to present a new method based on the Takagi-Sugeno (TS) fuzzy systems, for modelling daily global solar radiation recorded in Marrakesh, Morocco. The TS models are a non-linear techniques, defined by a set of If-Then rules with a linear consequent parts, each of which establishes a local linear input-output relationship between the variables of the model. The structure and the parameters of the developed model are identified using the fuzzy clustering combined to the least square algorithm. The identified fuzzy model is applied to the prediction of daily global radiation and a satisfactory result is obtained. Compared to the two models based on higher order statistics and using two different procedures, the fuzzy model provides the better results in the prediction of the daily solar radiation in terms of statistical indicators.
Abstract:Improving data availability in mobile ad hoc networks is very important issue since the ultimate goal of using these networks, is to provide information access to mobile nodes. Make data available in such environment where bandwidth, battery power and memory size are limited, is very difficult issueIn this paper we propose tow data replication methods for improving the availability of data. These methods executed under two main phases. In the first phase we create the primary replicas, and in the second phase we redistribute these replicas dynamically. The first method creates the primary replicas for each new data created in the network or received from fixed network. The second method creates the primary replicas only for the important data. The simulation experiments show that the data availability is improved and the traffic is reduced.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.