histone deacetylase inhibitors have gained a great deal of attention recently for the treatment of cancers and inflammatory diseases. so design of new inhibitors is of great importance in pharmaceutical industries and labs. creating pharmacophor models in order to design new molecules or search a library for finding lead compounds is of great interest. this approach reduces the overall cost ass...

routing in wireless sensor networks (wsns) is a very challenging task due to the large number of nodes, their mobility and lack of proper infrastructure. since the sensors are battery powered devices, energy efficiency is considered as one of the main factors in designing routing protocols in wsns. most of energy-aware routing protocols are mere energy savers that attempt to decrease the energy...

A major problem in information retrieval is the difficulty to define the information needs of user and on the other hand, when user offers your query there is a vast amount of information to retrieval. Different methods , therefore, have been suggested for query expansion which concerned with reconfiguring of query by increasing efficiency and improving the criterion accuracy in the information...

a major problem in information retrieval is the difficulty to define the information needs of user and on the other hand, when user offers your query there is a vast amount of information to retrieval. different methods , therefore, have been suggested for query expansion which concerned with reconfiguring of query by increasing efficiency and improving the criterion accuracy in the information...

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...