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Smart space is created by deploying a Semantic Information Broker (SIB) in a given Internet of Things (IoT) environment. The deployed SIB enables information sharing for many digital devices participating in the IoT environment. In this study, we consider CuteSIB — a new SIB implementation for the Smart-M3 platform, where the class of SIB host devices covers various embedded and mobile devices, in...
Modeling and Simulation (M&S) has become an essential tool in the development, testing and verification of operational software in a complex multi-domain, multi-threaded heterogeneous system of systems environment. The complex systems of today encompass mix of hardware sub-systems (with varying degree of capabilities), software environments (comprising a plethora of development environments, operating...
Edge cloud computing is a trending paradigm, which extends cloud computing by additionally utilizing computing resources at the network edge, e.g., at mobile base stations. Especially personalized services can be instantiated or migrated close to end users, which improves the latency and supports user mobility. However, the placement of the service chains is crucial for the performance of the services...
In order to cope with the exponential growth of mobile traffic, mobile operators need to access more spectrum resources. LTE in unlicensed spectrum (LTE-U) has been proposed to extend the usual operation of LTE in licensed spectrum to cover also unlicensed spectrum. However, this extension poses significant challenges especially regarding the coexistence between LTE-U and legacy systems like Wi-Fi...
Fog computing is a model in which data and processing are concentrated on devices at the edge of the network, rather than almost entirely in the cloud. This new paradigm tries to solve the latency and bandwidth issues that the current cloud systems have to deal with, and also addresses the scalability problems caused by the exponential growth of the number of smart devices due to the success of the...
Wireless sensor networks (WSNs) usually build from huge number of randomly deployed sensor nodes in certain area. The sensors are mainly utilized to monitor physical and environmental conditions, gather information, process this data locally and transfer the sensed data back to the Base Station (BS). The main objective of this paper is to simulate, evaluate and observe the behavior of developed clustering...
Scheduling is one of the most important issues in executing tasks in grid systems. A data grid mainly deals with sharing and managing large amounts of distributed data in executing data-intensive applications. It is primarily a solution to satisfy the requirements of data-intensive tasks processing. OptorSim is a useful open source simulation tool for data grids. In this paper a new two-step data-intensive...
Big Data is now a widely studied concept in the field of massive processing of information, but testing systems and applications in this field is a difficult task, because the real environments to be used are of a large scale and many times impossible to reproduce. Usually, for this task executions in virtual settings, called simulations, are used. The present article presents a simulator for applications...
Big Data is now a widely studied concept in the field of massive processing of information, but testing systems and applications in this field is a difficult task, because the real environments to be used are of a large scale and many times impossible to reproduce. Usually, for this task executions in virtual settings, called simulations, are used. The present article presents a simulator for applications...
Simulation is often used to evaluate the behaviour and measure the performance of computing systems. Specifically, in high-performance interconnection networks, the simulation has been extensively considered to verify the behaviour of the network itself and to evaluate its performance. In this context, network simulation must be fed with network traffic, also referred to as network workload, whose...
We present and analyze an Electric Vehicle (EV) charging management model for a fast charging station network in a smart grid environment. The proposed model considers a charging station network that provides service to multiple EV charging-classes. The basic feature of the proposed model is when EVs are blocked by their preferred station due to the unavailability of charging outlets, they are prompted...
This paper focuses on modelling and performance evaluation of an Intermodal Freight Transport Terminal (IFTT), the rail-road inland terminal of a leading Italian intermodal logistics company. The IFTT is regarded as a discrete event system and is modelled in a timed Petri net framework. By means of suitable performance indices, we simulate the Petri net model and evaluate the operational performance...
Distributed systems can be characterized by processes that communicate with each other by message passing, through communication channels, and may be located at several computers spread over a communication network. These processes and communication channels are usually characterized by synchronous or asynchronous timeliness behavior, according to the characteristics of underlying system (operating...
Owed to its regular structure and rich interweaving, facilitating simple and efficient dissemination and aggregation of data, the hypercube is an effective and popular interconnection network for parallel and distributed computing. Its short paths make it suitable for latency critical real-time applications such as live streaming or estimation of system state vectors, including object tracking or...
Designing complex embedded systems is a challenge, which benefits from using models for various tasks. Among them, an important one is finding a good (or the best) system design alternative for a given set of changeable parameters. Such decisions are usually based on non-functional properties which can be quantitatively expressed and evaluated using a model. Automatic optimization would be advantageous,...
Improvements in network infrastructures, storage capacity and computing power, along with advances in video coding technology, are enabling an increasing popularity of multimedia applications. Traffic modeling plays an important role in the performance evaluation of network architectures and protocols. In this paper, we describe a tool for video traffic modeling. A graphical user interface is presented...
This paper describes the evolution of procedures to protection relays performance testing. In the early days, the measurement and calibration of relays were made by analog devices and instruments that basically provided the steady-state tests. In the 70's came the electronic test equipment. With the passage of time have evolved, providing a full range of dynamic tests. With technological advances,...
Simulation can be an approximate performance evaluation method of real-time scheduling strategies. This method is useful when the analytical evaluation is too complex to be put in practice. In this paper we use simulation to evaluate the performance of Rate Monotonic and FIFO scheduling algorithms in different multiprocessor scheduling approaches. We present the design of our real-time scheduling...
This paper proposes an extended queuing system that will be called the VCHS queuing system. Several strategies for server assignment were evaluated using simulations, and selection of the appropriate strategy was found to lead to a marked improvement in system performance.
To evaluate radio communication network (RCN) organization and application is the foundation of efficient use of radio communications to organize data and voice communications. At present, it is a more effective method to evaluate network performance by simulation technology. Based on the simulation technology and operational evaluation theory, the paper researched on the qualitative and quantitative...
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