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This paper proposes a new way to complete the interface model mapping from CORBA to ontology in the field of network management, which is interface model mapping adapter. The adapter consists of three parts, which are CORBA interface analyzer, mapping controller and ontology information database. The adapter can automatically map the CORBA interface model to ontology interface model. Therefore, we...
Traffic modeling contributes remarkably to network design and performance evaluation in wireless networks. Various traffic models have been proposed for wireless networks thus far.. In order to provide a better understanding in this area, the article presents a detailed investigation to current studies of traffic models in different wireless networks. And then the origins of model differences are...
The current trend in research of methodology of system's design highlights the quality of resulted systems, however the research mainly aims at efficiency and safety of the development process itself. The most used development methodology used models as a basic means for description of systems. Although they can allow for model transformation, the designer has to adapt the resulted code manually....
Computer simulation of the road traffic is a very important tool for analysis and control of traffic networks. Because the simulation of a large traffic network (e.g. an entire city) can be computationally intensive, many simulators have been adapted for distributed computing environment. In this paper, an efficient communication protocol for distributed simulation of road traffic is described. The...
GMM supervectors are among the most popular feature sets used in SVM-based text-independent speaker verification systems. Most of the studies use only a single supervector to represent speaker characteristics, against a set of background samples. An alternative would be to divide the total training duration into smaller pieces to increase the number of supervectors for training the minority (speaker)...
Handling context-aware dynamically adaptable architectures contributes to the design of self-configuring software systems. Dealing with such a problem for communicating systems is even more challenging since adaptation should address simultaneously the different communication levels. In this paper, we address this problem by providing a model-based, rule-oriented approach that supports the adaptation...
We introduce PlanetSim, a discrete event-based simulation framework for peer-to-peer overlay networks and services. It is implemented in Java and provides good qualities for both researchers and developers, such as a strong system development background, as well as modularity, flexibility and clarity on its design and implementation. All this is corroborated by the important community using and supporting...
The traditional adaptive modulation and coding (AMC) scheme has been designed separately from higher protocol layers. In this paper, we consider the joint effects of finite-length buffer at the data link layer and the channel state information (CSI) at the physical layer for the adaptive transmission over the multiple input multiple output (MIMO) fading channel. A novel cross-layer adaptive transmission...
Traffic congestion is an important problem of today's urban life. Various approaches have been analyzed for solving this problem, most solutions addressing only a specific cause of the congestion. This paper focuses on rush hour congestion and aims to address its cause, the fact that many drivers need to reach the same destination and use the same routes, most frequently the shortest ones. A simple...
A significant fraction of parallel scientific codes are iterative with barriers between iterations or even between phases of the same iteration. The sender of a message is assured that the receiver is executing exactly the same iteration or phase. This opens up the opportunity to use one-sided communication without synchronization, explicit or implicit, between the sender and receiver of every message...
Decentralized tuple space has proven to be a well-suited paradigm for developing distributed component-based systems for its decoupling of processes in space and time, availability and flexibility in system's organization. However, there are very few research results on data's replication management and its influence on performance. In particular, we present our approach of tuple replication and various...
With the popularity of model-driven methodologies, and the abundance of modelling languages, a major question for a requirements engineer is: which language is suitable for modelling a system under study? We address this question from a semantic point-of-view for big-step modelling languages (BSMLs). BSMLs are a class of popular behavioural modelling languages in which a model can respond to an input...
From operating systems to cell phones and Web servers to PDAs, more products and systems depend on TCP for network interconnection everywhere and anytime. Congestion control is a key feature of TCP. TCP performance could have significant impact on the network life for wireless ad-hoc/sensor networks, as higher TCP throughput and lower retransmissions could reduce resource consumption. This paper evaluates...
The Delay/disruption tolerant networks (DTNs) provides a new option for the future network applications, but nothing has been done for the research on how to design and deploy the Web servers which can provide performance guarantee or service differentiation on DTNs. Response delay is a key performance metric for Web servers and proportional delay differentiated service is an important DiffServ model...
The effective cooperation and coordination of nodes is necessary for performance improvement in the P2P network. In this paper, we focus on the problem of maintaining considerable amount of cooperation and friendship in P2P networks of selfish peers. For this purpose we will analyze the performance of SLAC. It is a simple algorithm that maintains excessive levels of cooperation and friendship in a...
Adaptation is a crucial issue when building new applications by reusing existing software services which were not initially designed to interoperate with each other. Adaptation contracts describe composition constraints and adaptation requirements among these services. The writing of this specification by a designer is a difficult and error-prone task, especially when service protocol needs to be...
Although Virtual Learning Environments have become popular educational tools, they remain a very active research topic. Two important aspects being discussed for next-generation VLEs are how to track the performance of the students for assessment and how to provide personalized learning experiences (i.e. adaptive learning). In this line, educational videogames could contribute thanks to their highly...
Business processes realized by services rely on the functionality of these services. Maintaining the interoperability when services evolve independently is therefore an important and challenging problem. If adaptation is to happen automatically, then determining and categorizing changes and their solutions is crucial. In this paper, we make the following contributions: (1) we provide an overview of...
The initial phase in a content distribution (file sharing) scenario is delicate due to the lack of global knowledge and the dynamics of the overlay. An unwise distribution of the pieces in this phase can cause delays in reaching steady state, thus increasing file download times. We devise a scheduling algorithm at the seed (source peer with full content), based on a proportional fair approach, and...
Web services are the main pillar of the service oriented computing (SOC) paradigm which enables the application integration within and across business organizations. One of the important features of the Web services is the choreography aspect which allows to capture collaborative processes involving multiple services. In this context, one of the important investigations is the choreography compatibility...
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