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In cloud computing systems, users' demands are met through deployment of Virtual Machines (VMs) on Physical Machines (PMs). The rapid growth in cloud service demand has led to the establishment of large-scale virtualized data centers. However data centers consume a large amount of energy resulting in high operating costs and contributing to significant greenhouse gas (GHG) emissions. We propose to...
Parallel job processing has become a key feature of many software applications, e.g., in scientific computing. Parallelization allows these applications to exploit large resource pools, such as cloud or grid data centers. However, a job composed of a large number of parallel tasks will suffer a failure if any of its tasks fail, requiring reprocessing and additional delays. In this paper, we explore...
Reliability is a critical metric in the design and development of scale-out data storage clusters. A general multiway replication-based declustering scheme has been widely used in enterprise large-scale storage systems to improve the I/O parallelism. Unfortunately, given an increasing number of node failures, how often a cluster starts losing data when being scaled-out is not well investigated. In...
Space traveling wave tube (TWT) is one kind of microwave vacuum tube for communication, which must have high reliability, high power. The life of the space TWT is requested for a long lifetime of 10–15 years. In order to shorten the testing process, accelerated aging tests are performed at higher than normal operating temperature and currents of cathode. But in the process of the actual test, the...
A repairable system model which is consisted of two redundant robots and one safety unit is established in this paper. We are devoted to discussing the unique existence of the solution and the stability of the studied system by analyzing the spectrum distribution of the system operator in detail. Thus we can obtain stability analysis of the studied repairable system. Finally, some reliability indices...
The reliability of digital circuits designed in Schottky Barrier Carbon Nanotube Field Effect Transistor (SB-CNTFET) technology is investigated in this paper. We discuss factors that affect the height of the Schottky barrier and as a consequence the performance of circuits in SB-CNTFET. We then present a transistor-level analysis of reliability. The analysis is performed first for an inverter and...
Degradation data are widely used in the field of reliability analysis and remaining useful lifetime estimation. Usually, a critical threshold must be defined before both reliability analysis and lifetime estimation is executed. In this paper, we present a method to specify a critical threshold for Wiener degradation process, based on both historical lifetime data and degradation data. The lifetime,...
Existing studies of degradation process are most in the presence of single distribution, but the system degradation process are often multi-stage in practice, and different degenerate distribution corresponding different stages. Based on the general model of degradation process, this paper assumes degenerate distribution of two-stage mode to be different normal distribution, the value of shock times...
An optimization method of aircraft periodic inspection and maintenance on the zero-failure data analysis is proposed to effectively solve excessive maintenance in this work, and decrease aircraft unserviceable time. This method includes optimization object analysis, failure distribution recognition, zero-failure data analysis by confidence limit optimal estimate and nonlinear programming solving failure...
In mobile communication systems such as LTE, Hybrid-ARQ (HARQ) schemes based on Turbo codes have proved to be very effective in ensuring reliable transmission. However, several modified HARQ and Turbo decoding strategies have been recently developed to further improve performance. This paper proposes an enhanced coding scheme for LTE which couples a modified Turbo coding strategy with Reliability...
Most proteins form macromolecular complexes to perform their biological functions. With the increasing availability of large amounts of high-throughput protein-protein interaction (PPI) data, a vast number of computational approaches for detecting protein complexes have been proposed to discover protein complexes from PPI networks. However, such approaches are not good enough since the high rate of...
In cloud computing systems, a user request goes through several cloud service provider specific processing steps from the instant it is submitted until the service is completed. In this paper, we use service-oriented metrics to characterize the dependability of cloud computing systems in order to find the pitfalls and improve the service. We find that it is not possible to fully reflect the impact...
Reliability has become one of the most vital requirements in wireless sensor networks (WSNs). One efficient way to increase the reliability is by using erasure coding techniques such as Reed-Solomon/Cauchy Reed-Solomon. The problem is the time required for encoding and decoding the data words, especially when large amount of data need to be sent like in complex WSN applications. In this paper, we...
Along with the development of high-speed railway, higher and higher technical requirements for the mobile communication system in it are raised. Communication Based Train Control (CBTC) will be based on mobile communication, of which the key problem is how to support high reliability of data transmission in order to improve utilization of tracks and enhance train's safety. The applications of LDPC...
The increasing expansion of data scale leads to the widespread deployment of storage systems with larger capacity and further induces the climbing probability of data loss or damage. The Maximum Distance Separable (MDS) code in RAID-6, which tolerates the concurrent failures of any two disks with minimal storage requirement, is one of the best candidates to enhance the data reliability. However, most...
While solar photovoltaic (PV) panels can offset emissions and water use at the power plant, high levels of installed rooftop PV capacity can have negative impacts on the stability and efficiency of the local grid because of power factor (PF) degradation. Specifically, electric utilities have cited voltage fluctuations that occur more dynamically than legacy, electromechanical voltage regulation solutions...
There is an increasing demand for broadcasting information of common interest to a large number of users. The unreliable nature of wireless links and the difficulty of acknowledging the correct reception of every broadcast packet by every user when the number of users becomes large are two major challenges for wireless network broadcasting. In this paper we investigate the problem that a base station...
We propose a new framework for optimizing the target secrecy rate for SISOME wiretap channels when the instantaneous capacity of the eavesdropper's channel is not available at the transmitter. In our framework we introduce the effective secrecy throughput, a new optimization metric that implicitly captures the two key features of wiretap channels, namely, reliability and secrecy. We derive target...
The regularization and combination methods were applied to treat the small number of experimental results. The proposed algorithm permits to calculate the transverse phase space parameters, center dynamics, momentum spread of the beam as well as the structure dispertion characteristics. The reliability of the calculation results and carried out measurements is estimated.
A K-user repeat-accumulate interleave-division (RAID) system is considered for a Gaussian multiple access channel (GMAC) with binary inputs, equal-power, and symbol synchronization. In this system, a regular repeat accumulate (RA) code serially concatenated with spreading, where the rate of RA code and spreading length both can be changed, is employed for each user. K users are divided into M groups...
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