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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...
To improve the operation efficiency and service levels of Bus Rapid Transit (BRT) systems, we propose a novel realtime BRT signal priority approach through two-stage green extension. For social justices, we control traffic signal lights under the people first principle after constructing BRT Internet of Things. This requests us to collect enough traffic information related to BRT vehicles, social...
With the advent of industrial standards such as Wireless Hart, process industries are now gravitating towards wireless control systems. Due to limited bandwidth in a wireless network shared by multiple control loops, it is critical to optimize the overall control performance. In this paper, we address the scheduling-control co-design problem of determining the optimal sampling rates of feedback control...
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...
Optimization based spectrum sharing strategies have been widely studied. However, these strategies usually require a great amount of real-time computation and significant control delay, and thus are hard to be fulfilled in practical scenarios. This paper investigates optimal real-time spectrum sharing between a cooperative relay network (CRN) and a nearby ad hoc network. Specifically, we optimize...
One-way audiovisual quality and mouth-to-ear delay (MED) are two important quality metrics in the design of real-time video-conferencing systems, and their trade-offs have significant impact on the user-perceived quality. In this paper, we address one aspect of this larger problem by developing efficient loss-concealment schemes that optimize the one-way quality under given MED and network conditions...
In this paper, we outline a specific communication framework to support a novel demand management program on the edge of the power distribution network. We suggest a model where the arrival process of the smart appliances is made visible to control centers, forming a cellular Microgrid infrastructure, through Home Energy Management Systems (HEMS). These appliances then wait to receive an authorization...
In order to meet future communications with high fault tolerance, high reliability and real-time, etc., the Information Scheduling on the FlexRay were studied in this article. According to the analysis of the information scheduling and delay characteristics, propose optimization scheduling algorithm based on the principle of balance, and improve the bandwidth utilization of FlexRay.
We analyze the use of caching of video frames at network routers for reducing average retransmission delay. We formulate an expression for the average retransmission delay using video caching routers. In turn, we use this expression to formulate a mathematical program to minimize the average retransmission delay. We find a dynamic programming solution to the resultant non-linear convex binary integer...
In this paper, we propose a content-aware congestion control for multimedia streaming over TCP/IP networks. Unlike existing congestion control schemes over the Internet that adapt a user's sending rate merely to the network condition, our solution adapts the sending rate to both the network condition and the application characteristics by explicitly considering the distortion impacts, delay deadlines,...
Optimization techniques for improving the average-case execution time of an application, for which predictability with respect to time is not required, have been investigated for a long time in many different contexts. However, this has traditionally been done without paying attention to the worst-case execution time. For predictable real-time applications, on the other hand, the focus has been solely...
We consider cyber-physical systems where several physical plants are controlled by digital controllers implemented as periodic tasks executing in one embedded computer. If overload situations occur, control performances of the controlled plants may degrade seriously. We introduce an arbiter which accepts or drops jobs released by the tasks to avoid the overload situations. We consider a cost function...
Offline tuning of a genetic algorithm (GA) based time domain optimal PID controller has been carried out with stochastic consideration of delays and packet dropouts in a real time Networked Control Systems (NCS) by minimizing the Integral of Time multiplied Absolute Error (ITAE) and Integral of Squared Control Signal (ISCS). Hardware validation of the optimal PID controller performance is done on...
IEEE 802.15.4 is a global standard designed for emerging applications in low-rate wireless personal area networks (LR-WPANs). The standard provides nice features such as a beacon-enabled mode and guaranteed time slots for real-time data delivery. However, how to optimally operate those features is still an open issue. For the optimal operation of the features, this paper proposes a holistic optimization...
WOPANets (WOrst case Performance Analysis of embedded Networks) is a design aided-decision tool for embedded networks. This tool offers an ergonomic interface to the designer to describe the network and the circulating traffic and embodies a static performance evaluation technique based on the Network Calculus theory combined to optimization analysis to support early system level design exploration...
The performance of wireless LANs is greatly affected by path loss, RF interference and other sources of signal attenuation in addition to network congestion. The primary factors involved in effective real-time communication, namely delay and loss, must be within certain controlled limits in such a scenario. In this paper, we analyze the various factors driving IEEE 802.11b access points through extensive...
In this paper a MAC protocol with dynamic priority adjustment for light trail networks is presented. A weight mode which is composed of real-time factor and node activity ratio is used as a bid by each node to compute the priority. Simulation results show that DPA MAC reduced the burst loss rate and improved activity percentile when compared with FP MAC.
At present, the adjustment of train operation plans is undertaken generally before a comparatively long planning horizon such as 3 hours by the dispatchers via the workstation of train scheduling, which can not meet the requirements of optimization and real-time processing in the networked operation with medium- and high-speed trains. This paper establishes the generalized formal description for train...
For many control systems, control performance is strongly dependent on delay variations of the control tasks. Such variations can come from a number of sources including task preemptions, variations in task workloads and perturbations in the physical environment. Existing work has considered improving control task delay variations due to task preemption only. This paper presents a general adaptive...
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