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In this paper, we present the Hardware-In-The-Loop (HIL) usage of a new simulation approach recently introduced by the authors and discuss the programmable logic interface required for the HIL simulation of high switching frequency power electronics converters. As a test case, we simulate a notional ship power system where one converter is externally controlled using the developed HIL simulation platform...
We focus on the problem of computing tight deadline miss models for real-time systems, which bound the number of potential deadline misses in a given sequence of activations of a task. In practical applications, such guarantees are often sufficient because many systems are in fact not hard real-time. Our major contribution is a general formulation of that problem in the context of systems where some...
In heterogeneous computing systems MinMin and MaxMin are widely used in assigning independent tasks to processors. For N tasks to be assigned to N processors these approaches are known to run in O (KN2) time. An algorithmic improvement that asymptotically decreases the running time complexity of MinMin to O(KN logN) without affecting its solution quality is proposed in [1]. The newly proposed MinMin...
The conventional task models include periodic tasks, aperiodic tasks and sporadic tasks. A task model named rhythmic task is required for Cyber Physical Systems (CPS). Here, a Smart Energy Management System (SEMS) in a house, which monitors and controls the electrical appliances based on their power demand, has been considered as the CPS. The temperature control of air conditioner, which has high...
A new versatile and modular hardware platform for distributed real-time simulation is presented in this paper. The system is aimed at large-scale simulation on system level but with the ability to include simulation of switched power electronics for hardware-in-the-loop components connected to single nodes of the simulated system. High complexity is possible through parallelization on the system level...
Schedulability for compositional real-time systems has been the focus of a great deal of recent research. In this problem domain, we consider the fixed-priority (FP) scheduling of arbitrary-deadline sporadic task systems upon periodic resources. Existing exact or approximate schedulability tests for dedicated uniprocessor scheduling can be used in this setting by modeling the "no-supply period"...
The paper outlines a method for modelling largescale commercial, social, socio-technological and engineering problems. The method is derived from twelve years of experience in designing and implementing large complex systems for real-time scheduling of taxis, air taxis, car rentals, seagoing tankers, trucks, space crafts; dynamic data mining; dynamic knowledge discovery and semantic search. The same...
In this research, we develop a real-time fluid simulator, which uses smoothed particle hydrodynamics (SPH), for virtual environments including 3-dimensional fluid. SPH is a type of particle method and easy to control computational time by reducing or increasing the number of particles, however, it is difficult to change the number of particles while maintaining the same volume of fluid and the stability...
In this paper, we present a scalable implementation of a topic modeling (Adaptive Link-IPLSA) based method for online event analysis, which summarize the gist of massive amount of changing tweets and enable users to explore the temporal trends in topics. This model also can simultaneously maintain the continuity of the latent semantics to better capture the time line development of events. With the...
Advancements in compositional real-time scheduling frameworks have made it feasible to build large and complex real-time systems by composing multiple subsystems also known as components. Different frameworks with different resource models have recently been proposed for a variety of realtime task models. However, these works have focused their analysis on efficient scheduling of components' task...
The pay-as-you-go economic model of cloud computing leads naturally to an earn-as-you-go profit model for many cloud based services. These applications can benefit from low level analyses for cost optimization and verification. Testing cloud applications to ensure they meet monetary cost objectives has not been well explored in the current literature. We present a static analysis approach for determining...
Hardware in the Loop Simulation(HILS) plays an increasingly important role in the development and test system of missile. This paper describes the structure and function of a typical HILS Platform for missile testing. The platform has a double computers structure, which consists of the control computer and the simulation computer. The paper analyses the hardware and software requirements and gives...
In order to obtain multiple different simulation results, parameters need to be modified constantly during the simulation experiments. The simulation interactive technology based on interactive database (IDB) file is very difficult to operate for users, inducing its low¨Clevel simulation running efficiency. This paper introduced a simulation interactive technology based on parameter file with variable...
This paper presents the model splitting method for large-scale interactive network simulation, which addresses the separation of concerns between network researchers, who focus on developing complex network models and conducting large-scale network experiments, and simulator developers, who are concerned with developing efficient simulation engines to achieve the best performance on parallel platforms...
This paper presents a background modeling method to detect foreground objects precisely. An object detection system must face the problem of moving background, illumination changes, chaotic etc. in real applications. The proposed background model can be established and updated efficiently from real-time image sequences to overcome the various illumination environments. Based on our approach, the static...
With the constantly growing number of multimedia devices, images can now be viewed on a broad range of display of tremendously varying size. However, perceiving all the details of a multimedia content is difficult on smaller mobile devices. To solve this problem, saliency based image re-targeting algorithms have been proposed in order to generate more perceptually efficient thumbnails. In this article,...
Model-based design of embedded systems using Synchronous Reactive (SR) models is among the best practices for software development in the automotive and aeronautics industry. The correct implementation of an SR model must guarantee the synchronous assumption, that is, all the system reactions complete before the next event. This assumption can be verified using schedulability analysis, but the analysis...
Modeling and simulation tools have become an integral part of modern engineering processes. In particular, accurate and efficient simulation tools are critical for the design, development, and testing of autonomous unmanned ground vehicles (UGVs). However, because of the complexity of the problem, many UGV simulators are computationally intensive, require expensive hardware to run, and are often not...
Estimation of a object pose from camera is a well-developing topic in computer vision. In theory, the pose from a calibrated camera can be uniquely determined. But in practice, most of the real-time pose estimation algorithms suffer from pose ambiguity due to low accuracy of the target object. We think that pose ambiguity¡Xtwo distinct local minima of the according error function¡Xexist because of...
Hardware-in-the-Loop (HiL) has been a proven technique, widely used in the development and testing of realtime embedded systems, especially in the automotive industry. This paper describes the development of a HiL simulation platform for motion control systems, demonstrated with an example of Permanent Magnet Synchronous Motor (PMSM) control system development and testing. The platform uses industry...
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