The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper develops a model for optimal management of spares inventories in a network. This model is flexible and robust. It can be applied as local model or as a regional model supporting many local sites. The output includes a locally optimized list of spares that is optimized with respect to the frequency of failures, restoration time, and time to replenish the spares stock. If a regional spares...
Common approaches to addressing renewal and replacement rely on limited analysis of maintenance strategies and on deterministic approaches with finite, best approximation inputs. These over-simplified approaches yield results that greatly overestimate, or in many cases greatly underestimate, uncertainty and risk. Decision makers are often placed in a poor position to defend the annual budget as well...
The development of complex system, such as complex ship or warship, usually contains concurrent, iterative and coupling processes. Based on multi-resolution modeling, this paper presents a new approach for analysis and organization in Integrated Logistic Support (ILS). At high system level, a macro low resolution model is presented by System Dynamics, indicating whole relationship between life cycle...
This work extends current research in model analysis and program understanding to assist modelers in obtaining additional insight into their models and the systems they represent. Given a particular simulation implementation, this research demonstrates the feasibility of automatically-derived observations that could potentially enhance a model builder or model user's understanding of their models...
Based on China's patent data of communication industry from 1985 to 2009, and using the term of patent right as the measurement of patent value, this paper presents a survival function of patent maintenance in China and stratified Cox regression model. It makes a comparison study in terms of four aspects: the quality of domestic and foreign patent applicants, different technical fields, different...
The maintenance cost can be reduced significantly by applying the maintainability principle in the design and operation phase. An effective maintainability prediction can help the designer to improve performance and safety of equipment. The analysis of historical repair by an affective statistical approach provides essential information for decision-making regarding the planning of operation and maintenance...
There are various component-based software engineering models used in component-based software development. These models give guidelines for successful software development. These are important for the systematic development of a product within a given timeline along with all the quality attributes. Employing a suitable component-based software development life cycle model allows project managers...
Crowdsensing has become an emerging data collection paradigm for smart city applications. A new category of crowdsensing-based urban issue reporting systems have been developed to enable pervasive and real-time monitoring of urban infrastructure malfunctions. A key challenge exits in such systems is the duplicate report problem where uncoordinated users may submit redundant reports about the problem...
Safety cases need significant amount of time and effort to produce. The required amount of time and effort can be dramatically increased due to system changes as safety cases should be maintained before they can be submitted for certification or re-certification. Sensitivity analysis is useful to measure the flexibility of the different system properties to changes. Furthermore, contracts have been...
In this paper we apply survivability and software rejuvenation modeling to evaluate alternative software architectures. We analyze failure history in two large industrial projects and propose a unified failure model to be used for the assessment of system survivability at the software architecture phase. Our goal is to assess the mean time to repair a system, conditioned that it starts from a failure...
This paper, which is part one of a two-part series, presents a technique for assessing and developing control strategies for DSM in SGs by using reliability as a measure. The assessment of developed load models by aggregating portions of load and observing the impact on power network behaviour form an integral part of this work. Important input data for the assessment are presented. Reliability indices...
The increasing development and utilization of services based on cloud facilitates the development of sectors like entertainment through media streaming. Platforms such as Eucalyptus provide Infrastructure as a Service (IaaS), allowing to create and manage a wide variety of services on cloud. Redundant mechanisms are commonly adopted to achieve improvements of availability, since this issue is critical...
The present study defines a methodology to analyze the relationship between the failure rate of any component and the factors that can influence it, in order to link time independent operating variables to the reliability study. Characterizing the failure rate using these variables is especially useful for changing time operational contexts. To do this, a study of traditional and modern methods of...
In Wireless Sensor Networks (WSNs), performance and availability are important in providing Quality of Service (QoS). WSNs are prone to failures that may result from software and hardware malfunctions, battery drain, tampering and link failures. In addition, sensors are resource constrained in terms of inadequate processing capacity, limited storage memory and restricted power supply. Alternating...
The aim of this paper is to propose a new systemic modelling approach in order to model a complex task of maintenance and analyses its risks. This model combines Emmanuel two different tools belonging to systemic approach: UML (Unified Model Language) and MOSAR (Method Organized for a Systemic Analysis of Risk). The objective of this new model is to identify and to model the mechanism of hazard between...
Modern development of computing systems caters the collaboration of human-based resources together with machine-based resources as active compute units. Those units can be dynamically provisioned on-demand for solving complex tasks, such as observed in collaborative applications, crowd sourced applications, and human task workflows. Such collaborations involve very diverse compute units, which have...
While microgrid distribution system technology is rapidly increasing, the importance of finding a way to evaluate the effect of adding renewable DGs on the overall grid reliability has become essential. Renewable energies resources are effective because they reduce environmental pollution and improve energy utilization efficiency and reliability, which makes them widely used in the network. In this...
The correctness of model transformations is key to obtain reliable MDE solutions. However, current transformation tools provide limited support to statically detect and correct errors. This way, the identification of errors and their correction are mostly manual activities. Our aim is to improve this situation. Based on a static analyser for ATL model transformations which we have previously built,...
Model-based testing is of high practical relevance and many model-based testing approaches have been developed during the last years. But the key question under which conditions model-based testing pays off and a related decision support procedure for its application has not been sufficiently addressed. In this paper we develop a generic decision support procedure whether to apply model-based testing...
With the popularization of high-speed and high-capacity communication networks, machine-to-machine (M2M) communication has received significant attention. However, although the related technologies have been actively investigated, creating new businesses based on M2M communication is difficult. The information and communication technology community should take not only system modeling but also business...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.