Mobile Ad-hoc Network (MANET) consists of mobile nodes that are connected via very dynamic multi-hop channels. Routing in MANET is a challenging task that has received great attention from researchers. In this paper we present Maximally Spatial Disjoint Multipath routing protocol (MSDM) which is a modification of AOMDV protocol. MSDM finds paths which are spatially separated and maximally disjointed. We think that sending various packets over spatially disjointed paths reduces the probability of collision occurrence and allows concurrent transmission over the set of different selected paths. Performance comparison of MSDM and AOMDV using GloMoSim simulator shows that MSDM is able to achieve a considerable improvement regarding some performance metrics such as delay, routing packets overhead, and network throughput.

The Demand for Open Source Software (OSS) is increasing day by day. However, its end users still face challenges using such software. Therefore, this study is conducted to propose a fuzzy usability model to be an approach for evaluating the usability of the open source software. In order to propose such model, six common usability characteristics have been considered, namely: Learnability, understandability, attractiveness, operability, efficiency, and memorability. Some of these characteristics are related to the open source software's features (Learnability, usability, attractiveness, operability); and the rest are related to the end users. Finally, the Matalab Simulink software (Fuzzy Logic Toolbox) has been employed to simulate and to validate the proposed approach model. KEYWORDSOpen source software usability, usability characteristics, usability fuzzy model, and open source software usability model.