Video streaming is one of the challenging issues in vehicular ad-hoc networks (VANETs) due to their highly dynamic topology and frequent connectivity disruptions. Recent developments in the routing protocol methods used in VANETs have contributed to improvements in the quality of experience (QoE) of the received video. One of these methods is the selection of the next-hop relay vehicle. In this paper, a QoE-aware geographic protocol for video streaming over VANETs is proposed. The selection process of the next relay vehicle is based on a correlated formula of QoE and quality of service (QoS) factors to enhance the users’ QoE. The simulation results show that the proposed GeoQoE-Vanet outperforms both GPSR and GPSR-2P protocols in providing the best end-user QoE of video streaming service.
Background: Case-Based Reasoning (CBR) is a problem-solving paradigm that uses knowledge of relevant past experiences (cases) to interpret or solve new problems. CBR systems allow generating explanations easily, as they typically organize and represent knowledge in a way that makes it possible to reason about and thereby generate explanations. An improvement of this paradigm is ontology-based CBR, an approach that combines, in the form of formal ontologies, case-specific knowledge with domain one in order to improve the effectiveness and explanation capability of the system. Intelligent systems make daily activities more easily, efficiently, and represent a real support for sustainable economic development. On the one hand, they improve efficiency, productivity, and quality, and, on the other hand, can reduce costs and cut waste. In this way, intelligent systems facilitate sustainable development, economic growth, societal progress, and improve efficiency. Aim: In this vision, the purpose of this paper is to propose a new generation of intelligent decision support systems for Business Model having the ability to provide explanations to increase confidence in proposed solutions. Findings/result: The performance results obtained show the benefits of the proposed solution with different requirements of an explanatory decision support system. Consequently, applying this paradigm for software tools of business model development will make a great promise for supporting business model design, sustainability, and innovation.
In this paper, we discuss various aspects of the design, implementation, and use of JAPROSIM which is a general purpose discrete event simulation framework based on the Java programming language. JAPROSIM is an open source project developed for both academic and industrial purposes. It also merges processinteraction modeling structures with powerful java features in an intelligent way that encourages model simplicity, reusability and automatic statistics collection. Further motivations and aims are discussed. Java multithreading is a powerful built-in mechanism used to coordinate different entities in a coroutine-like mode. The main body of the paper is devoted for explaining the design of the framework in the context of Object Oriented Simulation. Finally, a summary of the proposed framework together with suggestions for improvements are given. JAPROSIM: A JAVA FRAMEWORK FOR DISCRETE EVENT SIMULATION 104 J OURNAL OF OBJECT TECHNOLOGY V OL. 7, NO. 1 long-term model development and maintenance because this programming skill is outside of the mainstream of information systems training in academia and within the enterprise. Some simulation languages allow for certain programming-like expressions or statements, which are inherently limited. Others allow the insertion of procedural routines written in other general-purpose programming languages. Even when that is possible, the task of the user is complicated. It has to learn and master a new language. It must also deal with creation, insertion and update of statistical variables which is a source of several errors. Object Oriented Modelling (OOM) is an excellent approach that deals with large and complex systems through abstraction, modularity, encapsulation, layering and reuse. OOM was born with SIMULA, the first object-oriented programming language. It introduced the object-oriented programming paradigm. Conceptual model is obtained by decomposing a real system in a set of objects in interaction. Each object represents a real world entity that encapsulates state and behaviour. A class is a template for creating objects that share common related characteristics. Guidelines are, in particular, identification of object classes that make up a system with their interfaces and implementations. Model conceptualization is one of the early steps in a simulation study for which OOM is suitable. Hence Object Oriented Simulation (OOS) benefits from all the powerful features of the OOM. It is, in addition, based on entities, events and simulation time that make the main differences, see [Joines & Roberts 98]. The use of the Unified Modelling Language (UML) in OOS seems to be even more appropriate since its version 2.0 offers significant improvements in dynamic behaviour modelling, which is a key aspect in any discrete event simulation, see [Page & Kreutzer 05]. The generation of executable code from static and dynamic UML models provides an important means for narrowing the gap between conceptual and computer models in simulation. Some research projects have already focused on a...
Aspect-oriented modeling and simulation is a new approach which uses the separation of concerns principle to enhance the quality of models and simulation tools. It adopts the separation of concerns (SOC) principle. Thus, crosscutting concerns such as processes synchronization, steady state detection, and graphical animation could be separated from simulation functional modules. The capture of crosscutting concerns in a modular way is carried out to cope with complexity and to achieve the required engineering quality factors such as robustness, modularity, adaptability, and reusability. This paper provides a summary of aspect-oriented paradigm with its usage in simulation by illustrating the main crosscutting concerns that may infect simulation systems. A practical example is given with the use of the Japrosim discrete event simulation library.
This paper focuses on the development of EQNM 2 L which is an extended queuing modelling and markup language. We discuss the DSML metamodel and its XML-based exchange format which represent the cornerstone of the development process. EQNM 2 L enhances interoperability between a wide range of analytical solvers and simulation tools dealing with systems performance evaluation and based on the extended queuing theory. Furthermore, the Model Driven Engineering approach allows automatic generation of modelling environments and simulation/analytical codes which improve productivity and quality. Our aim is to induce discussion on and contributions for elaborating the whole metamodel and providing a starting point for the development of a standard inter-change format.
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