Cloud computing is rapidly expanding because it allows users to save the development and implementation time on their work. It also reduces maintenance operational costs of used systems. Furthermore, enables elastic use any resource rather than estimating workload, which may be inaccurate, as database systems can benefit from such a trend. In this paper, we propose an algorithm that allocates m...

The recommendation system is an important tool for providing personalized suggestions to users about products or services. However, previous research on individual systems using skyline queries has not considered the dynamic personal preferences of users. Therefore, this study aims develop model based current and user location in a mobile environment. We propose RFM (Recency, Frequency, Monetar...

Feature model configuration can be supported on the basis of various types reasoning approaches. Examples thereof are SAT solving, constraint and answer set programming (ASP). Using these approaches requires technical expertise how to define solve underlying problem. In this paper, we show apply conjunctive queries typically by today's relational database systems satisfaction problems (CSP) -- ...

due to the lack of users knowledge of the collections used by search engines and in general retrieval systems, users can not express their information need appropriately in queries. in other words, they do not have enough experience to formulate their needs to find related documents. the idea of user’s query expansion aims to help users to improve and correct the queries. in fact, retrieval sys...

Heretofore several position-based routing protocols have been developed for mobile ad hoc networks. Many of these protocols assume that a location service is available which provides location information on the nodes in the network.Our solutions decrease location update without loss of query success rate or throughput and even increase those.Simulation results show that our methods are effectiv...

Heretofore several position-based routing protocols have been developed for mobile ad hoc networks. Many of these protocols assume that a location service is available which provides location information on the nodes in the network.Our solutions decrease location update without loss of query success rate or throughput and even increase those.Simulation results show that our methods are effectiv...