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This paper proposed a novel PV faults diagnosis method, which is based on the structure of differential power processing (DPP). Since the conventional PV faults diagnosis methods are very easily affected by the working environment conditions, such as solar irradiance and temperature. Compared to the conventional methods, this method is able to diagnose several PV modules at the same time. Furthermore,...
This paper shows new insights on the stochastic nature of aging-related timing impact in digital circuits. Varying critical paths through aging trigger the need for aging compensation control loop based on an unsupervised machine learning algorithm. Adaptive Resonance Theory (ART) algorithm is favored for its ability to handle the stability-plasticity dilemma.
In this paper, Spread Spectrum Time Domain Reflectometry (SSTDR) has been implemented for the first time across the gate and the source of a power metal oxide semiconductor field effect transistor (MOSFET) to perform the online degradation monitoring of switching devices as well as the overall converter. To accomplish this, the SSTDR test signal is superimposed with the pulse width modulated (PWM)...
Software rejuvenation is a simple but powerful method for improving the availability of computer systems. Software rejuvenation refreshes the running states of an application by restarting it. This method faces a challenge to apply it to a new type of applications, in-memory databases (DBs). Compared to stateless applications such as web servers, rejuvenating in-memory DBs is significantly expensive...
The aim of this paper is to identify the electrical signatures of degradations of large area organic light emitting diodes, subjected to various stress conditions. Three Philips GL55 OLEDs were stressed under three distinct temperature values; 23°C, 40°C and 60°C at a stress current density of J=15 mA/cm2 (rated current density: Jn=9.49 mA/cm2). Under thermal and electrical stresses, an increase of...
Stator inter-turn faults are among the most important electric motor failures as they progress fast and lead to catastrophic motor breakdowns. Inter-turn faults are caused due to the windings' insulation degradation. The main stress which deteriorates the insulation is the thermal one. Proper understanding of how this stress influences the electrical properties of insulation over time may lead to...
This paper discusses the impact of calendar ageing on the anode and the concentration of lithium ions in the anode structure. It discusses the modeling of the calendar ageing, its implementation in the 3D First Principle Based Degradation Model (3DM) of the battery and the results that were observed as a result of calendar ageing over a period of 4–6 years. The paper also relates these physical degradation...
The goal of this work is to develop a real time degradation monitoring tool for Silicon Carbide (SiC) power MOSFETs. The conventional methods for prognosis and reliability monitoring are mostly based on parametric measurements as on state resistance, threshold voltage, leakage currents etc. The change in switching characteristics of aged devices and the root cause analysis behind this change are also...
In this paper, the degradation at the gate oxide layer of a SiC MOSFET has been studied. The online condition monitoring was achieved by Spread Spectrum Time Domain Reflectometry (SSTDR) for the first time in SiC based devices. An accelerated aging station was built to age the power semiconductor devices in a standardized way, and power cycling test was performed to induce degradation. Finally, the...
In this paper, a comprehensive analysis on near field electromagnetic radiation (EMR) of SiC power devices throughout aging is studied. To realize thermally triggered degradation, an accelerated test bench has been built to actively apply power cycles, swing junction temperature and trigger device degradation. The junction temperature of the devices under test (DUT) exposed to 30°C to 170°C swing...
In this contribution, impact of extreme environmental conditions in terms of energy-level radiation of protons on SiGe integrated circuits is experimentally studied. Canonical representative structures including linear (passive interconnects/antennas) and non-linear (Low Noise Amplifiers) are used as carriers for assessing impact of aggressive stress conditions on their performances. Perspectives...
An analysis of the degradation occurred in RF life-tests of n-type MOSFETs operated from pulsed bench for a radar application in S-band is introduced. The analysis comes accompanied with experimental results, which are used to facilitate optimization of the robustness of Power RF MOSFETs. The recorded S-parameters before and after degradation allows the observation of the corresponding changes in...
This paper considers the statistical approach to model software degradation process from time series data of system attributes. We first develop the continuous-time Markov chain (CTMC) model to represent the degradation level of system. By combining the CTMC with system attributes distributions, a continuous-time hidden Markov model (CT-HMM) is proposed as the basic model to represent the degradation...
This study investigates the impact of "ghost" fingerprint and minutiae information in 4 year time-span separated fingerprint datasets. A high amount of ghost fingerprints within the data, eventually a source for differences in acquisition conditions, might be responsible for recently re- ported template ageing effects. According to that, various experiments have been performed to get rid...
In this paper, Underground distribution power cable of 20,000 lines was diagnosed using VLF(Very Low Frequency) tanô method. The accumulated big data is analyzed statistically with the Weibull distribution, and the 3D model is implemented through the matrix of statistical factors of TD (average of 8 point tanô), DEV(deviation), STDEV (standard deviation) and SKIRT(deviation slope of 8 point tanô)...
The Capacitive Micromachined Ultrasound Transducer (CMUT) technology has been under development for more than 20 years at Universities and industry labs. One of the major limitations for commercial use of CMUT probes has been poor reliability. Kolo Medical Inc. has developed a number of methods to improve reliability of CMUT probes. Kolo performed long term reliability tests to verify the improvements...
Gas insulated switchgear (GIS) is a compact metal encapsulated switchgear consisting of high-voltage components such as circuit-breakers and disconnectors, which can be safely set up in confined spaces. However, some GISs have been used for more than 40 years, so characteristic of sealing rubber is considered to be degraded. We find possibility of aging of the sealing rubber by comparing surface characteristics...
Lithium-ion battery second life usage might be an interesting solution for certain applications and it can bring not only environmental benefits but also e.g. lower electric vehicles or hybrid electric vehicles total cost of ownership. However, the electrical performance and performance degradation of the battery systems in the second life application are still unknown what brings significant economic...
From year to year there are lot of new requirements regarding to the lifetime and reliability of integrated circuits (IC) especially in automotive applications. In align with technology scaling the amount of device's reliability issues are increasing but the quality requirements becoming stronger. Now the aging phenomena becomes one of the critical issues in applications with longer life time. Hence...
The correlation between degradation-induced changes in two important indicators of mechanical properties, namely elongation at break (EAB) and indenter modulus (IM), is examined for flame-retardant ethylene propylene rubber (FR-EPR), silicone rubber (SiR), flame-retardant crosslinked polyethylene (FR-XLPE), and XLPE. The samples were degraded by heat or concurrently by heat and radiation. In the case...
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