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3D imaging capable devices have been available on the market for a few years now and the availability of 3D contents is also picking up. However, 3D contents available for viewing is not growing fast enough to meet the demand. To compensate for such a problem, most 3D imaging devices are equipped with 2D to 3D conversion function. Also, common 3D contents available are mostly produced with 2 view...
With the process of non-functional properties research on real-time systems, resource estimation and analysis of real-time systems become a hotspot. Process Algebra is a formal method fitting for analyzing the functional properties of real-time systems, but it can not analyze the resource properties. Resource Timed Process Algebra (RTPA) proposed in this paper can handle it efficiently by extending...
Timeliness and accuracy are two major concerns in many real-time embedded systems working in dynamic environments. It has been emphasized in the literature that in various real-time applications such as control systems and Kalman filters, delay is one main source of inaccuracy in the system. In this paper, we present a solution based on scheduling algorithms for the problem of inaccuracy in such systems...
Memory reservation provides real-time applications with guaranteed memory access to a specified amount of physical memory. However, previous work on memory reservation primarily focused on private pages, and did not pay attention to shared pages, which are widely used in current operating systems. With previous schemes, a real-time application may experience unexpected timing delays from other applications...
In real-time networked control systems, the end-to-end path delays on the communication network should be bounded in order to satisfy the stringent timing constraints of physical system. While the packet delivery on a single path could be significantly affected by network congestion levels, transmitting duplicate packets along multiple paths can overcome fluctuations of the time delay on a specific...
Real-time systems are often modeled as a collection of tasks, describing the structure of the processor's workload. In the literature, task-models of different expressiveness have been developed, ranging from the traditional periodic task model to highly expressive graph-based models. For dynamic priority schedulers, it has been shown that the schedulability problem can be solved efficiently, even...
Vehicular ad hoc networks (VANETs), which are a class of Mobile ad hoc networks, have recently been developed as a standard means of communication among moving vehicles. Congestion is one of the key issues which can restrict the Network performance, and it is no exception for VANETs. Congestion control mechanisms include three phases: congestion detection, congestion notification and rate adjustment...
Shared resource access interference, particularly memory and system bus, is a big challenge in designing predictable real-time systems because its worst case behavior can significantly differ. In this paper, we propose a software based memory throttling mechanism to explicitly control the memory interference. We developed analytic solutions to compute proper throttling parameters that satisfy schedulability...
Electronic learning has produced a comfortable, sophisticated, interactive and adaptable teaching model. Moreover, the consistent technical progress in this field allows the development of increasingly interesting applications [1]. We chose to select those elements to create an e-learning environment. This paper presents a model of the multi-tiered e-learning system based on Web Services. It shows...
In aeronautical industry, composite structures under testing often have complex and variable geometries. In this case, an optimal use of ultrasonic transducer arrays requires specific algorithms in electronic systems in order to achieve rapid and reliable inspections. To fulfil such requirements, a new real time and adaptive technique is presented. This technique is based on an iterative algorithm...
ECG signals received from a long distance call through mobile phone network need to be displayed instantaneously, smoothly and recorded. Due to non-uniform load and inherent time delay in the network the real-time display is incoherent. This will cause some discomfort or inaccuracies in observing the waveform at the critical moment, and then more or less affect the quality of work performed by the...
Wireless Metropolitan Area Network (WMAN) grows quickly due to a requirement of life. Among WMANs, IEEE 802.16 is the most popular standard. IEEE 802.16 supports mobility and Quality of Service (QoS). IEEE 802.16 regulates a handover scheme between a Mobile Station (MS) and a Base Station (BS). However, IEEE 802.16 does not have a priority rule in its handover scheme. Accordingly, a low-priority MS...
The synchrophasor technology has become focus of many theoretical, conceptual and practical studies lately due to an increased opportunity to improve power system reliability and security through enhanced monitoring, protection and control. The paper provides a survey of signal processing, communication and networking issues surrounding this topic so that professionals from related areas can benefit...
A critical part of the IEEE 802.16e MAC layer specification is scheduling. The scheduling mechanism has a significant effect on the performance of WiMAX systems for use of bandwidth and radio resources. In this paper, we propose a self-adaptive fuzzy based scheduler, and call this approach SAFS which respectively, adjust priority and transmission Quantum to each connection by taking the packet head-of-line...
The paper proposes a methodology to model and simulate a medium scale distribution network with several feeders in a real-time multi-core environment. Due to the small length of the lines, this type of simulation is still quite challenging especially when several cores are addressed to compute the simulation. Problems of model conditioning for multi-core computing are discussed. Validation results...
Management of household appliances and the services have been complicated by increasing of network devices recently. Therefore, Home Gateway (HGW) which manages them intensively has been expected as new consumer electronics. However, HGW has not been popular in our life because the installation cost of HGW is expensive compared with the benefits of services. In this study, we propose new home network...
In hierarchical networks, nodes are separated to play different roles such as CHs and cluster members. Each CH collects data from the cluster members within its cluster, aggregates the data and then transmits the data to the sink. Each algorithm that is used for packet routing in quality of service (QoS) based applications should be able to establish a tradeoffs between end to end delay parameter...
Recently, Peer-to-Peer (P2P) based multi-party video conference systems have been widely deployed. However, those solutions suffer from high cost when multiple users simultaneously distribute video streams to receivers. Most existing systems only support up to a dozen of users at the same time. In this paper, we propose a novel approach to construct and manage a heterogeneous P2P network for scalable...
There is a global consensus that our path towards a greener future depends on finding ways to reliably integrate renewable energy sources into the generation pool of our power grids. This vision is accompanied by the challenge of making demand significantly more flexible in order to compensate for the intermittent nature of renewable generation outputs and keeping the demand and supply continuously...
Network switches are typically designed for best- effort Internet traffic. Most of existing studies have been focused on improving throughput and delay performance in an average sense rather than providing guaranteed delay bound that is critical for real-time applications. It has not been fully investigated how to design an efficient packet switching algorithm for real-time applications. In this paper,...
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