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We have proposed CoMPACT monitor that achieves scalable measurement of one-way delay distribution for each flow. CoMPACT monitor is technique that transforms one-way delay data obtained by active measurement by using passively monitored traffic data of the target flow. In a recent study, it was reported that by using an inter-probe time that has a Gamma distribution can improve the accuracy of simple...
Grid is one of the currently and most actively developing concepts in the IT community, which nodes can dynamically enter and quit system. So, there are some real problems about nodes membership management in grid environments, especially, when considering asynchronous wide-area networks conditions, where messages may be delayed indefinitely and nodes may fail. Heartbeat detection is one of basic...
Currently, increasingly large number of Geospatial Web Services are being built in Spatial Data Infrastructures (SDIs). Although services make it easy for users to access desired information, the quality of Geospatial Web Services will greatly affect the willingness of users in access of these services. Therefore, in order to improve the use of service-oriented architecture for distributed geospatial...
CoMPACT monitor gives the one-way delay distribution of a target flow by using a transformation of one-way delay data obtained by active measurement. The transformation can be determined from passively monitored traffic data for the target flow of the measurement. In a recent study, it was reported that by using an inter-probe time that has a gamma distribution can improve the accuracy of simple active...
Advances in technology have led to the development of various light-weight sensor devices that can be woven into the physical environment of our daily lives. Such systems enable on-body and mobile health-care monitoring. Our interest particularly lies in the area of movement-monitoring platforms that operate with inertial sensors. In this paper, we introduce the notion of compatibility graphs and...
Aimed at the potential overload problems caused by the uncertainty of the arrived data in a data stream management system, the load shedding issue of the data stream system is researched. Focus on the condition that exists join operators of two streams, a semantic-based load shedding technique is applied. A data stream load shedding model is designed and implemented, which solves four problems including...
In this paper, we addressed the problem of improving call-based QoS measurement accuracy with the focus on call blocking probability as monitored via the active measurement or test drives in cellular-type networks. The system has been modelled as continuous time Markov chains with necessary assumption of Poisson traffics for both actual load and injected or intrusive load. With a product-form solution,...
New business infrastructures over the Internet pose a new set of traffic constraints. In particular, multimedia and interactive contents require guarantees of bandwidth and delivery time. The broad deployment and real-time nature of this class of applications require the provisioning of specific resources in the network to guarantee a certain level of quality of service (QoS). QoS techniques need...
Packet losses are a critical metric for network performance assessment. In this paper we present a novel methodology to accurately estimate the packet loss ratio in realtime in a fully distributed scenario. The constraint such systems must face is the large amount of resources required for keeping live performance assessment. Our contribution has two main parts. On the one hand we study the behaviour...
Failure detection is a basic service for building dependable systems. The large scale distribution of computing systems naturally makes failure detectors much harder to build. Moreover, providing QoS (quality of service) guarantees in this context is a challenging task. The objective of this paper is twofold: (1) proposing a complete set of classification criteria to compare different failure detection...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
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