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We consider the problem of real-time communication with delay constraints. In earlier work it has been shown that a certain weighted-debt policy is feasibility-optimal in the sense that if any scheduling policy can satisfy the throughput-with-deadline requirements of all the clients, then the weighted-debt policy can do so. This raises the interesting question: Why is it that a periodwise static priority...
Negative Bias Temperature Instability (NBTI) has become an important reliability issue in modern semiconductor processes. Recent work has attempted to address NBTI-induced degradation at the architecture level. However, such work has relied on device-level analytical models that, we argue, are limited in their flexibility to model the impact of architecture-level techniques on NBTI degradation. In...
Passive systems have been implemented in most of the advanced reactors in order to improve the availability of the plant. In this paper the methodology used for performing the passive system reliability analysis has been discussed. A case study on passive decay heat removal system of large sized PHWRs has also been discussed. Based on the thermal hydraulic analysis failure points have been generated...
Increasing complexity of power grids, growing demand, and requirement for greater grid reliability, security and efficiency as well as environmental and energy sustainability concerns continue to highlight the need for a quantum leap in harnessing communication and information technologies. This leap toward a ??smarter?? grid is now widely referred to as "smart grid". A framework for cohesive...
Future microprocessors increasingly rely on an unreliable CMOS fabric due to aggressive scaling of voltage and frequency, and shrinking design margins. Fortunately, many emerging applications can tolerate computational errors caused by hardware unreliabilities, at least during certain execution intervals. In this paper, we propose scalable stochastic processors, a computing platform for error-tolerant...
This paper combines the concepts of Markov analysis and the approximation of the failure characteristics of wear out components with Weibull distribution to arrive at an accurate and practical method for solving complex system reliability modeling problems. Present reliability models in the most part are based on constant failure rates wherein the probability of a component failure remains independent...
This paper has been designed to identify the Web metrics for evaluating the reliability and maintainability of hypermedia applications. In the age of information and communication technology (ICT), Web and the Internet, have brought significant changes in information technology (IT) and their related scenarios. Therefore in this paper an attempt has been made to trace out the Web-based measurements...
Many sensor nodes contain resource constrained microcontrollers where user level applications, operating system components, and device drivers share a single address space with no form of hardware memory protection. Programming errors in one application can easily corrupt the state of the operating system or other applications. In this paper, we propose Harbor, a memory protection system that prevents...
This paper proposes a method for modular redundancy optimization in a hierarchical series reliability system. A modular design variable is defined and modular redundancy is allocated to a different hierarchical level. An especially appropriate genetic algorithm, a hierarchical genetic algorithm (HGA), is used to solve the modular redundancy optimization. The results obtained indicate that modular...
Many embedded systems contain resource constrained microcontrollers where applications, operating system components and device drivers reside within a single address space with no form of memory protection. Programming errors in one application can easily corrupt the state of the operating system and other applications on the microcontroller. In this paper we propose a system that provides memory...
We study the control of completely observed Markov chains with safety bounds as introduced by Arapostathis et al (2005), but with more general safety constraints and the added requirement of optimality. The safety bounds were specified as unit-interval valued vector pairs (lower and upper bounds for each component of the state probability distribution). In this paper we generalize the constraint set...
In this paper, macro- and micro-modeling technique is implemented to correlate the compliance, deformation and thermal fatigue damage of composite interconnect structures that consist of copper columns and solder joint. Systematic simulation results reveal the dependence of solder joint fatigue life upon four geometric parameters such as column height, column radius, solder volume and substrate pad...
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