E-Learning tools facilitate asynchronous (e.g., wiki) and synchronous (e.g., video-conferencing) learning. They may provide a cost effective way to train large numbers of people in global settings to leverage complex technologies such as Unified Modeling Language (UML) tools. Few industrial experiences from the use of e-Learning tools to train complex technologies have been reported. It is uncl...

as functional integration has increased in hand-held consumer devices features such as global positioning system (gps) receivers have been embedded in increasingly more devices in recent years. for example, the train positioning system based on gps provides an integrated positioning solution which can be used in many rail applications without a cost intensive infrastructure. the network built i...

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considering the large amount of investment in railway transportation systems, effective use of resources is highly important. typically, in order to utilize the line capacity, train scheduling plays a substantial role and thus attracts lots of attention all over the world. various train-scheduling models are introduced, according to different conditions of different countries. however, for iran...

ewline"> Dispersion of heavy gases is considered to be more hazardous than the passive ones because it takes place more slowly. ...