Power transformer is a vital component of power system, which has no substitute for its major role. They are quite expensive also. It is therefore, very important to closely monitor it’s in – service behavior to avoid costly outages and loss of production. Many devices have evolved to monitor the serviceability of power transformers. These devices such as Buchholz relay or differential relay re...

The media, especially the video delivery over mobile channels may be affected by link outages and transmission bit rate variations due to the actual channel condition and the used wireless interface. In this paper we present the use of Priority-based Transmission Scheduling of SVC media data to overcome link outages and reduction in channel bit rate in mobile networks. The Priority-based Transm...

Nowadays, distribution utilities face new technical-economical requirements, aiming at improving the profitability of the electricity distribution systems. Such context requires both, a high reliability and availability of the electric networks. In order to do so, it is necessary to minimize outages, reducing at the same time, their duration. This situation leads to redefine the current mainten...

The dynamics of power system blackouts and the associated Self-Organized Criticality (SOC) behavior is a subject that receives continuous attention in view of its inherent complexity and relevant consequences. Within this context, the paper focuses on the short-term dynamic and, more specifically, aims at studying the role of the spinning reserve and frequency control on the blackout mechanism....

The General Packet Radio Service (GPRS) extends the Global System Mobile Communication (GSM) by introducing a packet-switched transmission service. This paper analyzes the GPRS behavior under critical conditions. In particular, we focus on outages, which significantly impact the GPRS dependability. In fact, during outage periods, the cumulative number of users trying to access the service grows...

The General Packet Radio Service (GPRS) has recently become a standard to extend the services provided by the Global System for Mobile Communications (GSM). GPRS addresses packetoriented traffic, by allowing a more efficient usage of the radio resources with a consequent improvement in the QoS of subscribers. This paper focuses on a preliminary evaluation of dependability and performance figure...

Wireless systems that carry delay-sensitive information (such as speech and/or video signals) typically transmit with fixed data rates, but may occasionally suffer from transmission outages caused by the random nature of the fading channels. If the transmitter has instantaneous channel state information (CSI) available, it can compensate for a significant portion of these outages by utilizing p...

Weather and environmental factors are verified to have played significant roles in historical major cascading outages and blackouts. Therefore, in the simulation and risk assessment of cascading outages in power systems, it is necessary to consider the weather and environmental effects. This paper proposes a method for the risk assessment of weather-related cascading outages. Based on the analy...

It had been shown that the misbehaviors by few malicious, compromised or misconfigured BGP routers could lead to serious outages in Internet. This failing becomes progressively crucial as the recent prosper of outage-sensitive applications such as Voice over IP, streaming media, and video conferencing. To address these misbehaviors, previous work mainly focus on distributedly detect or prevent ...