in this paper, we study different methods of solving joint redundancy-availability optimization for series-parallel systems with multi-state components. we analyzed various effective factors on system availability in order to determine the optimum number and version of components in each sub-system and consider the effects of improving failure rates of each component in each sub-system and impr...

The results of a study the architecture hardware and software for unidirectional data transmission in computer networks are presented. is presented form optical galvanic isolation, media converters proxy servers, excluding bidirectional at level. Work on carried out basis UDP transport protocol, which provides operation without establishing interaction. Unidirectional transfer by server running...

Software systems are intrinsically redundant. We identify the sources of intrinsic software redundancy in good design practices, and suggest how to exploit intrinsic software redundancy to augment software systems with self-healing capabilities and to automatically generate test oracles. Reliability is becoming a necessity for many software systems used in everyday life, where failures may inte...

As the technology entering into Nano dimensions, the manufacturing processes are becoming less reliable, that is drastically impacting the yield. Therefore, fault tolerant systems are becoming more important, particularly in safety-critical applications. In this paper, we present the design and analysis of 4-bit Arithmetic and Logical Unit (ALU) circuit designed using CMOS 180 nm process techno...

Redundancy allocation problem is one of most important problems in reliability area. This problem involves with the suitable redundancy levels under certain strategies to maximizing system reliability under some constraints. Many changes have been made on this problem to draw the problem near to real situations. Selecting the redundancy strategy, using different system configuration are some of...

Aggressive scaling of CMOS transistors has enabled extensive system integration and building faster and more efficient systems. On the flip side, this has resulted in an increasing number of devices that fail in shipped components in-the-field for a variety of reasons including soft errors, wear-out failures, and infant mortality. The pervasiveness of the problem across a broad market demands l...

A SCOMPUTING systems have grownmore powerful, with a concomitant shrinking of their operational circuitry, the possibility of radiationinduced faults in the hardware has become an ever more pressing concern. This is especially true for systems that must operate outside the protection of the Earth’s atmosphere and magnetosphere. Spacecraft and planetary rovers must balance their computing perfor...

Dependable real-time embedded systems are typically composed of tasks with multiple criticality levels allocated to a number of heterogeneous computing nodes connected by heterogeneous networks. The heterogeneous nature of the hardware, results in a varying level of vulnerability to different types of hardware failures. For example, a computing node with effective shielding shows higher resista...

Field Programmable Gate Array (FPGA) devices offer a suitable platform for survivable hardware architectures in mission-critical systems. In this dissertation, active dynamic redundancy-based fault-handling techniques are proposed which exploit the dynamic partial reconfiguration capability of SRAM-based FPGAs. Self-adaptation is realized by employing reconfiguration in detection, diagnosis, an...