the economic growth and development programs in iran call for particular attention for environmental quality control and protection through designing proper sewage treatment and disposal. to design such system, 'the frequency analysis of rainfall is required for the estimation of quantities of flows. there are few places in iran, with adequate rainfall data to permit frequency analysis, an...

for last years, the evolution of new issues has incited a great development of the transportation system. in this paper, we discuss ingredients of its (intelligent transportation system) that are inter-vehicle communication (ivc) or what can call vehicular ad hoc networks (vanet), which are special type of manet. we will survey the main issues relevant to vanet in detail with providing a concep...

Communication in microkernel-based systems is much more frequent than system calls known from monolithic kernels. This can be attributed to the placement of system services into their own protection domains. Communication has to be fast to avoid unnecessary overhead. Also, communication channels in microkernel-based systems are used for more than just remote procedure calls. In distributed syst...

Operating Systems provide services that are accessed by processes via mechanisms that involve a ring transition to transfer control to the kernel where the required function is performed. This has one significant drawback that every service call involves an overhead of a context switch where processor state is saved and a protection domain transfer is performed. However, as we discovered, it is...

Computers have been used for language teaching ever since the 1960's.Learning a second language is a challenging endeavor, and, for decades now, proponents of computer assisted language learning (CALL) have declared that help is on the horison. We investigate the suitability of deploying speech technology in computer based systems that can be used to teach foreign language skills. In this case,...

Today’s programs run in hostile environments. An adversary attacking a running process may radically alter the program’s course of execution. Such attacks will be of little value to the adversary unless he can cause the program to affect the outside world by executing a system call. A fruitful line of research on system call interposition has investigated using security checks on system calls t...

As part of a PhD on code forking in open source software, Linus Nyman looked into the origins of how the practice came to be called forking. This search led to the early history of the fork system call. Having not previously seen such a history published, here we look back at the birth of the fork system call to share what was learned, as remembered by its pioneers. The fork call allows a proce...