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In order to prioritize the facilitate maintenance and inspection plan, fault propagation paths of large complex systems is researched. By network modeled for large-scale system, the state equation of the network vertices is established. According to the failure information of network vertices, an improved petri nets combined with a directed graph theory is used to observe state transfer by established...
Load rate adjustment strategies based on reducing peak and filling valley and the proportion of load shifting are presented, and the algorithm for the load adjustment is also presented. The relationship between the system reliability and the load rate is modeled using the spline interpolation method. Both the two load rate adjustment strategies can adjust the load demand between the peak and valley...
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...
Cloud computing and service computing can be integrated into a distributed computing platform which provides a set of services to their users. Different services could cooperate with each other to accomplish more intricate tasks. However, third-party cloud services may cause failures or quality violation of workflow applications. Especially in some critical business scenarios, service performance...
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...
The metrics used for evaluating energy saving techniques for future HPC systems are critical to the correct assessment of proposed methods. Current predictions forecast that overcoming reduced system reliability, increased power requirements and energy consumption will be a major design challenge for future systems. Modern runtime energy-saving research efforts do not take into account the energy...
In this work we will illustrate the criteria useful to identify simple and quick operations through which “the why and the when” a scheduled maintenance can be performed in order to avoid excessive checks and controls, often difficult and expensive to run. The question that in fact arises in the preparation of preventive maintenance program is if it is possible to satisfy the reliability requirements...
With rapid development of internet, more and more consumers choose to shop from different channels, such as offline channel and online channel. Some consumers prefer shopping through offline channel because they want to experience the products' quality in person, while other consumers would like to shop online because they care more about the efficiency of shopping. There are several factors that...
Operational expenses of servers and the data center to support them account for a significant part of the total cost of ownership of a data center and potentially the total business. Manipulating the inlet temperature to the servers can provide a possible method of lowering the operating cost of a data center. Conventional wisdom regarding management of the cold aisle temperature in the data center...
Over the past several years, a heterogeneous computing (HC) system has become more competative as a commercial computing platform than a homogeneous system. With the growing scale of HC systems, network failures become inevitable. To achieve high performance, communication reliability should be considered while designing reliability-aware task scheduling algorithms. In this paper, we propose a new...
Wireless broadcast has been widely utilized to deliver information of common interest to a large number of users. A major challenge for wireless broadcast is that wireless links are often unreliable. Further, it is not feasible for every receiver to acknowledge the correct reception of broadcasted packets. In this paper we investigate the use of wireless broadcast to deliver a given number of packets...
Grid-tied Solar Inverters rely heavily on the current sensor information to fulfill all the complex tasks associated to deliver appropriate power to the energy system with low distortion. Sensing voltage and current are an essential part of the feedback current control loop for any grid tied-solar inverter. When the sensed signal is lost, the inverter output could become unstable thus having, as a...
Increases in system loads and in levels of penetration of renewable energy, together with limited investment in transmission infrastructure, are fostering the need for a smarter and more dynamically controllable grid. FACTs devices can be used to dynamically control the grid and more efficiently route power and thus mitigate these stresses, but such devices are either too complicated and expensive...
Operation principle and possible applications of a novel type of silicon cell integrated circuit (IC) device - injection-coupled device (ICD) - are addressed, including design-for-reliability (DfR) aspects. Examples of possible ICD electrical and physical designs are examined in detail. These are based on the existing CMOS and use bipolar technologies. It is shown that ICDs are, to an extent, similar...
The evaluation of remote sensing satellite system effectiveness is a complex problem that is multi-subject, multi-factor, multi-layer, and multi-object. As a first look, the evaluation of remote sensing satellite effectiveness appears corresponding to the general concept of satellite product quality. The purpose of this study is to present a simple and metric methodology for evaluating remote sensing...
Modeling based approach is described for analyzing and evaluating Internet server system reliability and availability in this paper. In the given model the states are defined by the different kinds of failures of the server system. The Markov model evaluates the probability of jumping from one known state into the next logical state. The probabilities between transitions of the states are a function...
In this paper, the availability optimization of refining system of Sugar Industry is done. Sugar industry is a complex repairable system having various subsystems including Feeding, Refining and Crystallization systems etc. Refining system of a Sugar Industry has four subsystems connected in series and parallel configuration. The system is modelled by considering Markov process with the probabilistic...
In this paper we study the communication reliability of wireless sensor networks (WSN) under a phased-mission framework. Two types of communication phases in WSN are identified: infrastructure communication phase (ICP) and application communication phase (ACP). A complete WSN communication task usually involves one or more ICP and ACP. The difficulties in the reliability analysis of traditional phased-mission...
In this paper we consider a k-out-of-n load sharing system, in which the failure of a component increases the hazard rates of the surviving components. The components failures follow a power law intensity function. The system is periodically inspected to detect failed components if the number of failures is less than n-k+1. However, the system fails when the number of failures equals to n-k+1, which...
This paper focuses on one of the earliest steps in System of Systems (SoS) design aiming to meaningfully determine stakeholders' values or preferences. It recommends the plural problem definition and dynamic construction of stakeholder's values in the front end of design process. It suggests a method based on the probability theory to embed flexibility and tolerance, and construct a basic framework...
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