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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...
Solid-state lighting (SSL) products can have a predicted life of 70% lumen output (L70) from 26,000 to 40,000 hours using the LM-80-08 testing standards. Chromaticity shift, correlated color temperature (CCT) and lumen maintenance (LM) will dramatically reduce the nominal life of SSL luminaires. In this work, an off-the-shelf luminaire from Philips (AmbientLED) has been aged in a standard wet hot...
Nowadays the world energy infrastructure is subjected to a progressive transformation. In fact it is already possible to notice the growing number of distributed small generation units, based on different technologies, directly connected to the power grid. At present the energy that can be produced by the sun and wind seem to be the most promising renewable energy sources. The use of the solar energy...
Microwave tubes for communication must have high reliability, high power, and a long life of 10 to 15 years. Cathode as the electric source module in microwave vacuum tubes, its reliability and life directly affect the tube's reliability and life. In this paper, electronic gun in short tubes are accelerated to evaluate the lifetime of one kind of microwave vacuum (such as traveling wave tube). In...
The objective of this study is to investigate the use of LSSVM (Least Square Support Vector Machine) trained with Chaotic PSO (Particle Swarm Optimization) for distinguishing different levels of Dementia from brain MRI. The availability of an effective method that is more objective than human readers can potentially lead to more reliable and reproducible dementia diagnostic procedures. The proposed...
Reliability, an important design attribute, can be assessed quantitatively or qualitatively in myriad ways. For any one product such a broad gamut of testing can be narrowed by understanding the application environment, for example indoor or outdoor; the specific suitability of a particular test and if it can be done directly or indirectly; and the possible failure modes from unnecessary or excess...
The rating inconsistency in subjective rating between two raters may result in the fact that the score the examinee got departs from his real ability. And artificial rerating process is both time consuming and laborious. So the author in this paper applied the Uadj Scheme and the Sadj Scheme to HSK (advanced) essay scores to examine rating errors and to compare these two schemes. The study shows that...
Reliability Demonstration Testing (RDT) for non-repairable systems has been successfully implemented in many industries, such as microelectronics, aerospace and healthcare. In designing RDTs, the famous beta-binomial formula is often applied to determine the necessary sample size so that the required reliability metric at a given confidence level can be demonstrated. However, many systems, such as...
This paper proposes a practical model to monitor the degradation of electronic equipment and further to predict the remaining useful life based on the self-diagnostic data. The de gradation precursor, characterized by voltage or current signals, is modeled as a Non-stationary Gaussian process with tim e-varying mean and variance. Statistical testing is then used to characterize the trend patterns...
From historical data this paper will note the significant patterns and key parameters that provide the basis for general guidelines that are very useful in establishing a realistic reliability growth testing program. These guidelines also address concerns raised by the 2008 Defense Science Board Task Force addressing reliability. As noted by this Task Force two major risks areas are the initial MTBF...
A recent paper (Spall, 2009) introduced a method for estimating the reliability of a complex system based on a combination of full system and subsystem (and/or component or other) tests. It is assumed that the system is composed of multiple subsystems, where the subsystems may be arranged in series, parallel (i.e., redundant), combination series/parallel, or other mode. Maximum likelihood estimation...
This work studies the electrical and testing reliability issues of CuxO based RRAM (Resistive Random Access Memory). Firstly, we study the most important electrical reliability issue-data retention capability, and propose a filament/charge trap combined model to clarify the retention failure mechanism. Secondly, we respectively study the reliability problems caused by the SET compliance current in...
This article deals with the problems associated to practical determining the reliability test scope. The author presents his own findings and experience resulting from his participation in testing reliability of many technical systems. Main attention is dedicated to procedures for ascertaining reasonable limits to be considered for performing reliability tests. The author presents main parameters...
This paper evaluates Weibayes small sample, zero and sudden death failure test and data analysis techniques in order to mathematically and graphically quantify the risk associated with assuming an incorrect value of the Weibull shape parameter, beta (beta). Specifically, the risk associated with assuming a value of beta that is higher than the ldquotruerdquo value of beta is investigated, as this...
Reliability is very important for the systems in aeronautics and astronautics. Despite its appeal for attractive mathematical features the PLP model suffers from a few drawbacks. Duane and Crow/AMSAA models are widely used in the reliability growth assessment. But for the reliability growth case, the intensity function of the PLP has the rather unrealistic feature that it tends to infinite as time...
Web site usability works have been mainly descriptive and lack a marketing perspective. For this reason, we find necessary to focus the attention on this aspects and its effects on consumer trust and satisfaction. By mean of empirical analyses, such as structural equation models, partial least squares technique and t-tests methodologies it is confirmed the impact of usability on satisfaction and consumer...
The problem of detection of control flow errors in software has been studied extensively in literature and many detection techniques have been proposed. These techniques typically have high memory and performance overheads and hence are unusable for real-time embedded systems which have tight memory and performance budgets. This paper presents two algorithms by which the overheads associated with...
Networks on chips (NoCs) provide a mechanism for handling complex communications in the next generation of integrated circuits. At the same time, lower yield in nano-technology, makes self repair communication channels a necessity in design of digital systems. This paper proposes a reliable NoC architecture based on specific application mapped onto an NoC. This architecture is capable of recovering...
This paper solves the problem of minimizing triple bit error miscorrection for single-error-correcting, double-error-detecting codes (SEC-DED codes) which are used to protect all kinds of memory against errors. A lower bound for triple bit error miscorrection for the widely used class of odd-weight column codes is derived and actual codes which are very close to that theoretical bound are presented...
In this paper, we present a new technique to improve the reliability of H-tree SRAM memories. This technique deals with the SRAM power-bus monitoring by using built-in current sensor (BICS) circuits that detect abnormal current dissipation in the memory power-bus. This abnormal current is the result of a single-event upset (SEU) in the memory and it is generated during the inversion of the state of...
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