The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The advancements in distributed computing have driven the emergence of service-based infrastructures that allow for on-demand provision of ICT assets. Taking into consideration the complexity of distributed environments, significant challenges exist in providing and managing the offered on-demand resources with the required level of Quality of Service (QoS), especially for real-time interactive multimedia...
Modern distributed real-time systems (DRTS) are typically formed by several heterogeneous networked devices. Sometimes these devices must adapt to dynamic environments in which devices may join or leave the network and must respond in run-time to changing requirements ensuring certain levels of QoS. These characteristics yield to systems that are intrinsically complex to develop, test and maintain...
Highly desirable types of networked multimedia applications should adapt to changes in the environmental conditions in which they operate, such as communication bandwidth, available memory, and battery lifetime, while providing the best possible quality of service (QoS). In this paper we present a software architecture that facilitates the development of adaptive networked multimedia applications...
Cloud computing offers the potential to dramatically reduce the cost of software services through the commoditization of information technology assets and on-demand usage patterns. However, the complexity of determining resource provision policies for applications in such complex environments introduces significant inefficiencies and has driven the emergence of a new class of infrastructure called...
In this paper, we introduce an IP multimedia sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of service oriented architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network...
Performing QoS (Quality of Service) control in large computing systems requires an on line metric that is representative of the real state of the system. The Tardiness Quantile Metric (TQM) introduced earlier allows control of QoS by measuring efficiently how close to the specified QoS the system is, assuming specific distributions. In this paper we generalize this idea and propose the Generalized...
The real-time distributed computing environment and reusable software architecture are important factors that affect the fidelity of flight simulation. We accomplished a flight simulator based on DDS (data distribution service for real-time systems) middleware and structural software architecture and proved its high fidelity as a flight training device. According to the analysis of flight simulator's...
Service-oriented architecture (SOA) has become the preferred methodology to build complex enterprise applications. Inside an enterprise, an enterprise service bus (ESB) has emerged as a powerful and flexible solution to have services and applications interact with each other, independently of their location and connectivity requirements. ESBs are implemented with some form of middleware, and messaging...
Current generation of distributed real-time systems requires more flexibility and the ability of changing its behaviour at run time. This paper presents a model and an algorithm for QoS-aware service composition in distributed systems with real-time requirements. This model is applicable in application domains where temporal guarantees and flexibility are needed, such as remote monitoring, control...
Service oriented architecture (SOA) has become a popular paradigm for software development in many application domains, including real-time applications. Timing analysis is a critical issue which can guide service composition to best satisfy the real time requirements of the composed system. However, existing timing analysis works do not sufficiently address some important issues. For example, admission...
In this paper we study the soft real-time web cluster architecture needed to support e-commerce and related applications. Our testbed is based on an industry standard, which defines a set of Web interactions and database transactions with their deadlines, for generating real workload and bench-marking e-commerce applications. In these soft real-time systems, the quality of service (QoS) is usually...
A real-time system is a system that is required to react to stimuli from the environment within time intervals dictated by the environment. In real-time applications, the timing requirements are the main constraints and their mastering is the predominant factor for assessing the quality of service. The safety-critical nature of their domain and their inherent complexity advocate the use of formal...
Many high performance distributed real-time object computing systems (HP-DRTOC) would benefit from the scalability, flexibility and inborn ability to solve the heterogeniety of CORBA if it could support real-time HPC. This paper makes two contributions to design and implement real-time CORBA for HP-DRTOC. First, it gives the architecture of real-time CORBA that indicates the basic components for HP-DRTOC...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.