Performance and Reliability Analysis of Computer Systems: An Example-Based Approach Using the SHARPE Software Package provides a variety probabilistic, discrete-state models used to assess reliability performance computer communication systems. The included are combinatorial (reliability block diagrams, fault trees graphs), directed, acyclic task precedence graphs, Markov semi-Markov (including reward models), product-form queueing networks generalized stochastic Petri nets. A practical...

The near future evolution of the cloud computing can be hypothesized in three subsequent stages: stage 1 "Monolithic" (now), services are based on independent proprietary architectures; 2 "Vertical Supply Chain", providers will leverage from other providers; 3 "Horizontal Federation", smaller, medium, and large federate themselves to gain economies scale an enlargement their capabilities. Currently, major clouds planning transition 2, but how achieve is unclear because some architectural...

Research in the Internet of Things (IoT) conceives a world where everyday objects are connected to and exchange, store, process, collect data from surrounding environment. IoT devices becoming essential for supporting delivery enable electronic services, but they not sufficient most cases host application services directly due their intrinsic resource constraints. Fog Computing (FC) can be suitable paradigm overcome these limitations, as it coexist cooperate with centralized Cloud systems...

Abstract In the current worldwide ICT scenario, a constantly growing number of ever more powerful devices (smartphones, sensors, household appliances, RFID devices, etc.) join Internet, significantly impacting global traffic volume (data sharing, voice, multimedia, and foreshadowing world (more or less) smart “things” in Internet Things (IoT) perspective. Heterogeneous resources can be aggregated abstracted according to tailored thing-like semantics, thus enabling as Service paradigm, better...

Preventive maintenance of operational software systems, a novel technique for fault tolerance, is used specifically to counteract the phenomenon "aging". However, it incurs some overhead. The necessity do preventive maintenance, not only in general purpose systems mass use, but also safety-critical and highly available clearly indicates need follow an analysis based approach determine optimal times perform maintenance. In this paper, we present analytical model system which serves...

In a client-server type system, the server software is required to run continuously for very long periods. Due repeated and potentially faulty usage by many clients, such "ages" with time eventually fails. (Huang et al., 1995) proposed technique called "software rejuvenation" in which periodically stopped then restarted "robust" state after proper maintenance. This "renewal" of prevents (or at least postpones) crash failure. As lost cost incurred) due failure typically more than...

The advent of both Cloud computing and Internet Things (IoT) is changing the way conceiving information communication systems. Generally, we talk about IoT to indicate a new type distributed system consisting set smart objects, e.g., single board computers running Linux- based operating systems, interconnected with remote infrastructure, platform, or software through able provide as Service (IoTaaS). In this context, container-based virtualization lightweight alternative hypervisor-based...

The internet of things (IoT) is essential for the implementation applications and services that require ability to sense surrounding environment through sensors modify it actuators. However, IoT devices usually have limited computing capabilities hence are not always sufficient directly host resource-intensive services. Fog computing, which extends complements cloud, can support with resources deployed close where data sensed actions need be performed. Virtualisation an feature in cloud as...

The burgeoning paradigms of Fog and Edge computing propose delegating Cloud-related tasks to the network's periphery, thus placing computational resources closer data producers. This shift promises boost performance IoT-based services, providing swift response times while conserving bandwidth. Despite their potential, current Edge/Fog platforms must provide required flexibility for dynamic service orchestration within a data-oriented context. Addressing this gap, Function-as-a-Service (FaaS)...

The exponential growth of connected devices and sensor networks has revolutionized data collection monitoring across industries, from healthcare to smart cities. However, the true value these systems lies not merely in gathering but transforming it into actionable intelligence. integration IoT, cloud computing, edge AI offers a robust pathway achieve this transformation, enabling real-time decision-making predictive insights. This paper explores innovative approaches combine technologies,...

Cloud Computing is becoming one of the most important topics in IT world. Several challenges are being raised from adoption this computational paradigm including security, privacy, and federation. This paper aims to introduce new concepts cloud computing focusing on heterogeneous federated scenarios. We present a reference architecture able address Identity Management (IdM) problem InterCloud context show how it can be successfully applied manage authentication needed among clouds for...

Only commercial cloud solutions have been implemented so far, offering computing resources and services for renting. Some interesting projects, such as Nimbus, OpenNEbula, Reservoir, work on cloud. One of their aims is to provide a infrastructure able share scientific purposes. The encouraging results volunteer projects in this context the flexibility cloud, suggested address our research efforts towards combined new paradigm we named Cloud@Home.On one hand it can be considered...

This paper intends to contribute the design of a pervasive infrastructure where new generation services interact with surrounding environment, collecting data and applying management strategies. According such perspective computing, storage sensing become complementary aspects be coordinated. In this way innovative value-added can implemented by bridging Clouds Internet Things. Heterogeneous resources aggregated abstracted according tailored thing-like semantics, thus enabling Things as...

Cloud computing is a promising paradigm able to rationalize the use of hardware resources by means virtualization. Virtualization allows instantiate one or more virtual machines (VMs) on top single physical machine managed monitor (VMM). Similarly any other software, VMM experiences aging and failures. Software rejuvenation proactive fault management technique that involves terminating an application, cleaning up system internal state, restarting it prevent occurrence future In this work, we...

Cloud computing is among the hottest trends in ICT, aiming at providing on-demand and storage resources with guarantees on quality of service. A limit current implementations absence mechanisms to effectively manage inputs from physical world. Our idea move towards a pervasive Cloud, facilities solutions able interact surrounding environment enabling development new value added services. In this vision also mobile devices, such as PDAs, usually equipped several sensors actuators, have be...

Monitoring activities detect changes in the environment and can be used for several purpose. To develop new advanced services smart environments, data gathered during monitoring need to stored, processed correlated different pieces of information that characterize or influence itself. In this paper we propose a Cloud storage solution able store huge amount heterogeneous data, provide them uniform way. aim, adopt an hyrid architecture couple Document Object oriented strategies, order optimize...

The increasing number of everyday embedded devices that are interconnected over the Internet leads to need new software solutions for managing them in an efficient, scalable, and smart way. In addition, such produce a huge amount information, causing well known Big Data problem, be stored processed. This emerging scenario, as Things (IoT), raises two main challenges: large-scale environments management storage/analytics. this paper, we address both challenges, proposing AllJoyn Lambda,...