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A modular UPS system is generally presented as having a much higher level of availability than a monolithic, double conversion, on-line UPS system. However, there are different types of modular UPS systems available on the market, with varying degrees of reliability and availability. To represent the strengths and weaknesses of each architecture and accurately compare them to one another, a detailed...
With the increasing use of medium voltage drive systems in power plant, it is interesting to develop a novel internal electrification scheme based on common DC bus concept. Despite obvious improvement on efficiency increasing, one of the most concerned issues is whether reliability performance would decrease to an unacceptable level led to by introduction of common DC bus layout. To mitigate the concern,...
This paper considers a relayed broadcast in IEEE 802.11 wireless local area (WLAN) networks. In the relayed broadcast, a source node intends to deliver data frames to many nodes beyond its coverage and all the nodes except the source node attempt to relay the received data frames in a contention-based and distributed manner. This traffic dissemination scheme, referred to as flooding, has several problems...
Erasure coding has been widely adopted to protect data storage against failures in production data centers. Given the hierarchical nature of data centers, characterizing the effects of erasure coding and redundancy placement on the reliability of erasure-coded data centers is critical yet largely unexplored. This paper presents a comprehensive simulation analysis of reliability on erasure-coded data...
Recent developments induced by the Internet of Things (IoT) force a paradigm shift to deploy on demand services to a broad range of different computing architectures. Mainly single board computers (SBCs) gained a lot of attraction in recent years, shifting highly available processing power to service consumers and IoT devices. Simultaneously, container virtualization achieved a breakthrough by the...
The general structure and main principles of creating a multi-version post-severe NPP accident monitoring system, which consists of one wired and three drone-based wireless network subsystems, are proposed. Reliability block diagrams for the system are built. On the basis of the reliability block diagrams, reliability models of the system are developed. The dependence on probability of failure-free...
This paper introduces test solutions for Integrated Fan Out Wafer Level Chip Scale Packaging (InFO WLCSP) which has the promising of being a very cost effective solution to achieve “More than Moore's law” for mobile devices — more so than 3D integrated circuits (3DIC). InFO WLCSP has its own unique test challenges and it is important to have high-quality screen methodology for severe defects and potential...
In today's economic conditions, engineers are faced with the problem of designing complex distributed computer systems under tight deadlines. Ensuring high reliability and robustness of such systems requires redundancy of their structure as well as the processes of data transmission and handling. The purpose of this study is to create simulation models and means to support computer-aided design of...
Dependability models are focused only on the basic stuck-at faults. In previous work a method has been shown on how to calculate dependability prediction using Markov chain models. This method has been described using the TMR architecture. In this paper a similar method for calculating the dependability parameter lambda (i.e., the failure rate of the system) is proposed. Focus is given on the dependability...
In an era of continuously shrinking technology and escalating power density, Multiprocessor System on Chips (MPSoCs) suffer from a growing prominence of device defects and increase of dependability-related issues. This paper tackles the dependability challenge by suggesting an adaptive reliability enhancement strategy for multicore systems. We dynamically adapt the reliability enhancement to the actual...
Communication between air traffic controllers and pilots remains a vital part of air traffic control operations, and communication problems can result in hazardous situations. The modern Air Traffic Management (ATM) system has independent direct communication channels (CC) for each controllers operating at different radio frequencies. Currently, the main method of improving the reliability of controller's...
As the security is becoming more and more important these days, we still should not forget about reliability. When designing a cryptographic device for some mission-critical or another reliability demanding system, we need to make the device not only attack-resistant, but also fault-tolerant. There are many common fault-tolerant digital design techniques, however, it is questionable, how these techniques...
This research provides a concise answer to how to organize a strong infrastructure of information technologies for high availability based on open source software, it's necessary for large organizations to provide high availability, the work will focus on explaining the procedures to provide services for users 24 hours the 365 days. Centralization is a major weakness today because is the only source...
The article presents a new method for predicting the reliability of the automobile starter using the AgenaRisk program and experimental research. The program allows to forecast the health status of the starter and provide service intervals of its technical condition. Simulation studies for selected faults in the electrical and mechanical circuits of the starter allowed to carry out an analysis of...
This paper describes the fault tolerance comparative analysis of a battery electric energy storage consisting of multiple battery submodules and fuel cell electric energy source for the traction drive of an electrical helicopter. The entire propulsion system reliability assessment is based on the reliability evaluation of the system components including electric energy sources. Considering the high...
Recently, FPGA-based NCS applications have been widely used. Industrial environments have a lot of electromagnetic interference which may induce transient and permanent faults. As a result, Fault-Tolerant FPGA based NCS applications are required. In this paper, an NCS model composed of a combination of S2A architecture and In-Loop architecture connected to each other through Ethernet switch, is described...
Phased-mission system (PMS) can have a number of mission phases with different system configurations of components. In engineering practice, there exist PMSs that have phases with time redundancy, meaning that the system is required to work in operational state for only a given duration of time within such phase, instead of all the phase duration like traditional PMS. For such complex PMS, it is not...
This paper describes a methodology of quantitative assessment of the fault tolerance of the multi-state safety-critical systems with functional redundancy. Such systems are the traction drives of electrical vehicles, consisting of the multiphase traction electric motor and multilevel electric inverter. It is suggested to consider such traction drive as a system with several degraded states. As a comprehensive...
The vision of cyber-physical systems (CPSs) considered the Internet as the future communication network for such systems. A challenge with this regard is to provide high communication reliability, especially, for CPSs applications in critical infrastructures. Examples include smart grid applications with reliability requirements between 99–99.9999% [2]. Even though the Internet is a cost effective...
Silicon Carbide (SiC) Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs) have the potential to increase the power density in power electronics converters compared to the currently used silicon (Si). Their benefits are higher efficiency, higher switching speeds, and higher operating temperatures. Moreover, SiC MOSFETs, which are normally-off, offer the possibility to directly replace Si Isolated-Gate-Bipolar-Transistors...
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