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In order to enable a more wide-scale utilization of PV systems, the cost of PV energy has to be comparable with other energy sources. Oversizing the PV array is one common approach to reduce the cost of PV energy, since it increases the PV energy yield during low solar irradiance conditions. However, oversizing the PV array will increase the loading of PV inverters, which may have undesired influence...
Most of the models proposed in the literature try to model failure rate functions and failure intensities by means of a single model with a reduced number of parameters. If this approach can be effective for controlled situations or simple models it may happen that new models should be introduced in order to describe more accurately the behavior of the cases where non-monotonic failure rate or intensity...
Late life failures in software occur primarily due to certain Triggers that are inadequately present in the development and test processes. Triggers surface faults that are otherwise dormant driven by workloads, configurations, traffic, etc. This case study presents Trigger and Impact distributions across five stages of testing in development and early customer trials. These distribution changes and...
High reliability is extremely important for uninterruptable power supplies (UPS) such as those used in the modern data centers. It is necessary to comprehensively and precisely evaluate reliability of different UPS system's architectures before constructing the data center. In this paper, a novel reliability analysis and simulation tool for data center power distribution system is proposed. The basic...
Differential power processing (DPP) module integrated converters are developed to mitigate the effects of the mismatch losses in series connected photovoltaic (PV) strings. This paper focuses on the configurations used in various DPP converter topologies by categorizing them into two main classifications: 1) Maximum power point tracking configurations and 2) voltage balancing configurations. The implementation...
High-voltage and high-current power converters are essential in numerous applications, including shipboard power systems and industrial motor drives. Most of the existing topologies are based on dc-link converters, and use dc-dc or dc-ac power cells to realize a multilevel power converter. Therefore, they require a large number of capacitors with high capacitances. This paper proposes a new modular...
Degradation prediction is important for safety related products to avoid failures. When the degradations of multiple parameters of a product is taken into account, traditional univariate degradation prediction method is not applicable, especially when the parameters are correlated. To cope with this problem, Mahalanobis distance is proposed, to combine multiple parameters into one unified index. Then...
According to the character of long-term repairable storage systems, a method for estimation and optimization of storage availability is presented. Such system experiences two storage periods, cold storage period and hot storage period. According to the different inspection methods of the two periods, we established the storage models based on periodic inspection and continuous inspection respectively,...
In a process collaboration, changes rarely confine themselves to a single company, but can spread over the network of partners, resulting in a whole process of negotiation. This paper employs techniques from the domains of multiple criteria decision making (MCDM) and group decision to deal with change negotiation in process collaborations. In particular, it utilizes multi-criteria reasoning to model...
The paper proposes an algorithm to process Alpha activity in real-time electroencephalogram signal using LabVIEW for mental state detection. The electroencephalogram signals from occipital region have direct relationship with the state of mind which can be utilized by physically challenged individuals to control their surrounding environment, providing an extent of independency. Being independent...
This paper presents an overview of the various failure mechanisms observed when a SiGe HBT is operated outside of traditionally-defined electrothermal safe operating areas (SOAs). The concepts of hard and soft safe operating area (SOA) boundaries are defined in this work. This provides two different viewpoints which determine the degradation and failure of a SiGe HBT as a function of bias conditions...
The evolution of convolutional neural networks (CNNs) into more complex forms of organization, with additional layers, larger convolutions and increasing connections, established the state-of-the-art in terms of accuracy errors for detection and classification challenges in images. Moreover, as they evolved to a point where Gigabytes of memory are required for their operation, we have reached a stage...
Usage-based statistical testing employs knowledge about the actual or anticipated usage profile of the system under test for estimating system reliability. For many systems, usage-based statistical testing involves generating synthetic test data. Such data must possess the same statistical characteristics as the actual data that the system will process during operation. Synthetic test data must further...
Emergency protection of objects in the process of testing and functioning should respond to a wide range of abnormal situations: malfunctions, which can be eliminated during testing; emergency situations that can be eliminated in the operational mode, or require the shutdown of the process and the elimination of the consequences of the accident; catastrophic situations that require an a priori reaction...
Existence of several application specific network technologies like Sensor Networks, Cloud, Personal Area Networks (WPANs), Vehicular Networks (VANETs), Content Delivery Networks and Wifi operating oblivious to each other in the same ISM band creates numerous problems like contention for the same bandwidth leading to excessive collisions and hence lower throughput. This calls for a hybrid mesh framework...
Research in the area of internet-of-things, cyberphysical-systems, and smart health often employ sensor systems at residences for continuous monitoring. Such research-oriented residential monitoring systems (RRMSs) usually face two major challenges, long-term reliable operation management and validation of system functionality with minimal human effort. Targeting these two challenges, this paper describes...
The authors plan to perform a new reliability analysis of a motor drive system for mining applications, whose environment is harsh due to the presence of vibration, high temperature, dust and other stress factors. The previous study was disregarded because it had been made using the traditional approach, based on handbook constant failure rate models. Since this traditional method is no longer recommended,...
In this paper, a new class of bidirectional universal power converters is presented. As a universal power converter, the proposed converter can interface any type of source and load without any limitation in their forms (ac or dc) and number of phases. In this converter, which accomplishes power conversion in a single stage, a small inductor placed in series with the input and output switch-bridges...
Silicon carbide (SiC) power MOSFETs have been becoming a strong alternative to silicon (Si) technology in high-voltage, high-frequency, and high-temperature applications. Despite their growing market share, limited field information is available regarding the aging facts under thermal stress and long term reliability of discrete SiC MOSFETs. In this paper, discrete SiC devices are thermally aged through...
Semiconductor power modules are widely used in machine drive applications. The temperature distribution in the power module is the result of load properties and the drive cooling. The temperature induced thermal-mechanical stress in the power module bond wires is critical for the power module reliability and lifetime. In this paper, a two level, three phase Silicon-Carbide (SiC) inverter power module...
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