Abstract Ad hoc networks are characterized by multi-hop wireless networks with frequently changing network topology and lacks predefined infrastructure. The mobile nodes are wireless and following some predefined mobility pattern and using some propagation model and are efficiently connected to form an autonomous system. However, the network is dynamic in nature thus there is no restriction on the nodes and have... Ad hoc networks are characterized by multi-hop wireless networks with frequently changing network topology and lacks predefined infrastructure. The mobile nodes are wireless and following some predefined mobility pattern and using some propagation model and are efficiently connected to form an autonomous system. However, the network is dynamic in nature thus there is no restriction on the nodes and have complete freedom to join or leave the network. In this network, any change in network should be completely migrated across the network in quick time. In this research paper, the performance of two prominent non-fading propagation models – Two Ray Ground and Free space propagation models are compared under on-demand routing protocols for mobile ad hoc networks—Ad Hoc On-Demand Distance Vector Routing (AODV). The performance of AODV is tested under Random Waypoint Model (RWP) and Random Direction (RD) Model using Network Simulator-2 (NS-2). We demonstrated that even though Two Ray Ground and Freespace propagation models share few similar behaviors, but the differences in the propagation mechanics can lead to significant performance differentials. The performance differentials are evaluated and analyzed using varying network size, topological area, transmission range, network load, mobility and pause time. Based on the observations, the conclusion and recommendations are given about how the performance of both propagation models and protocol can be improved. Read More Read Less

Abstract This study focuses on the tendencies of current research related to knowledge sharing. The literature review emphasizes the key factors that influence the motivation of knowledge sharing within organizations. The review investigates factors of knowledge sharing in three different areas: individual factors, organizational factors, and technological factors. The current tools used in knowledge sharing are also surveyed. Thirty eight research papers between... This study focuses on the tendencies of current research related to knowledge sharing. The literature review emphasizes the key factors that influence the motivation of knowledge sharing within organizations. The review investigates factors of knowledge sharing in three different areas: individual factors, organizational factors, and technological factors. The current tools used in knowledge sharing are also surveyed. Thirty eight research papers between 2009 and 2013 are investigated. The result of this research indicates that significant factors can motivate the development of knowledge sharing within an organization effectively. Read More Read Less

Abstract The innovation of Internet has enhanced the use of computers and mobile devices. As a result a large amount of data is being generated on daily basis. Information Technology infrastructure continues to grow with evolving technology and as a result a new business model has emerged known as “Cloud Computing”. It is set of resources and services which are obtainable through... The innovation of Internet has enhanced the use of computers and mobile devices. As a result a large amount of data is being generated on daily basis. Information Technology infrastructure continues to grow with evolving technology and as a result a new business model has emerged known as “Cloud Computing”. It is set of resources and services which are obtainable through the Internet. Cloud services are provided from data centers which are located all over the world. It is one of the most electrifying technologies because it has reduced cost related to the computing whereas increased flexibility, scalability, mobility and enhanced storage. The rapid growth in the field of “Cloud Computing” similarly upsurges severe security concerns. Security is actually one of the widely discussed issues in cloud computing; other issues being Availability, Integrity etc. Many research papers have proposed solutions to these problems. Read More Read Less