Two essential features of a real-time operating system (RTOS) are time management and task scheduling. Such features reduce software developers’ burden of designing, implementing, and validating generic system infrastructure, thus lowering costs and decreasing application time-to-market. However, there is a cost that is often paid as system overhead during the runtime. Hardware coprocessors tha...

The goal of the project was to develop a method for obtaining timing information for Linux processes and threads that is more precise than the one currently provided by getrusage(). The getrusage() system call is a fairly standard one, that returns the time a process has been running (CPU time) in terms of seconds and microseconds. With even the most recent builds of the stable Linux 2.2.14 ker...

Single and Multi-CPU Performance Modeling for Embedded Systems

This paper describes the design and implementation of a resource-centric real-time kernel, of which goal is to achieve explicit and precise resource management. The architecture of the resource-centric kernel is constructed for the provision of resource management kernel entities, which is called resource sets, with user applications. A resource set encapsulates a set of the resources which are...

We present an approach to design of fault tolerant computing systems. In this paper, a technique is employed that enable the combination of several codes, in order to obtain flexibility in the design of error correcting codes. Code combining techniques are very effective, which one of these codes are turbo codes. The Algorithm-based fault tolerance techniques that to detect errors rely on the c...

introduction: cerebral vein thrombosis is a rare complication of nephrotic syndrome (ns).we report a known case of ns with hemorrhagic thrombosis. case report: a boy with previous history of ns was admitted with headache and decrease of level of consciousness and his brain images were revealed hemorrhagic thrombosis conclusions: cerebral vein thrombosis must be considered in patients with histo...

enhanced immune cell trafficking into the central nervous system (cns) and disruption of the blood brain barrier are pathophysiological hallmarks of neuroinflammatory disorders like multiple sclerosis (ms) and its animal model, experimental autoimmune encephalomyelitis (eae). however, recent studies suggest that the coagulation and the contact-kinin system might also be involved in ms developme...

early warning systems are key components of strategies to reduce risk. this research, by adopting a systematic approach in the management of the risk of desertification and by including previously developed models and systems, offers an integrated efficient structure in terms of early warning for the risk of desertification as a pilot system for semi-arid areas of west golestan province in iran...