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Today, workflows are executed in heterogeneous environments, such as the Internet, to automate interactions with services of business partners and other third parties. In such heterogeneous environments, device and communication failures occur frequently. These failures might delay or even stop the workflow executions rendering the workflow unavailable. For ensuring availability, workflow executions...
Article deals with the problem of simulation modeling of robust control system for nonlinear plants with the input signal saturation, functioning under a priori uncertainty conditions and in the presence of several statement delays. With the help of computational experiments, the quality of the control system operation under various initial conditions of the controlled plant is illustrated.
Cyber-physical agnosticism (CPA) is a property of software in cyber-physical systems (CPS) to withstand various disturbances and keep maintaining the required behaviour of the physical process. With the increased research on the use of internet of things (IoT) in industrial automation (IoT-A), there is a need for robust distributed automation control systems that can take into account some overheads...
This paper examines the accuracy of the zero-order hold (ZOH) model of the digital pulsewidth modulator (DPWM). The influence of the computational delay on the precision of this equivalent DPWM model is discussed in detail. A compensation method is proposed to compensate the deviation of this DPWM model for accurately calculating the stability region with different computational delay and duty-cycle...
Conventional resonant controllers (RCs) are commonly used in the current control of grid-tied converters with LCL filter due to their advantages, such as zero steady-state error at both fundamental sequences, easy design process, and straightforward implementation. Nevertheless, these traditional solutions do not permit to place the closed-loop poles of the system in convenient locations when dealing...
Mobile edge computing (MEC) has recently emerged as an important paradigm to bring computation and cache resources to the edge of core networks. However, the resources of edge network are relatively limited, so it is necessary to cooperate with data center (DC) which has sufficient computational resources. In this paper, we aim at designing a computation offloading and data caching model under the...
Millimeter wave (mmWave) communication has become a promising key technology of the fifth generation (5G) communication systems, and gained extensive interests. In this paper, we examine 60 GHz mmWave channels in an indoor office environment by means of ray tracing method. Based on geometrical optic (GO) and uniform theory of diffraction (UTD), ray tracing method uses computer simulation to approximate...
This paper introduces a study of the fog computing suitability assessment as a solution for the increasing demand of the IoT devices. In particular, we focus on the energy consumption and the Quality of Service (QoS) as two important metrics of the performance of the fog. Therefore, we present a modeling of these two metrics in the fog. Then, we express the problem as constrained optimization and...
Based on Cloud Computing, Networked Control Systems and Internet of Things, the concept of Cloud Control Systems is proposed to handle complex and high-intelligent systems with mass data. This paper is concerned with cloud control systems based on data-driven predictive control, which is designed by applying the subspace matrixes method. The proposed algorithm can provide accurate real-time control...
Process variation is increasing with each successive technology node, and it has reached the point where the worst-case timing modelling employed by current FPGA CAD tools is significantly underutilizing the available silicon. Previous studies have proposed exploiting FPGA reconfigurability to reduce this underutilization using techniques such as late binding and dynamic voltage scaling. Most of the...
Modern task parallel programming models provide sophisticated runtime task schedulers for handling the scheduling of logical tasks on a large and varying number of hardware parallel resources at runtime. The performance of these programming models increasingly rely on how fast their runtime schedulers do their job. The more delay a scheduler incurs in matching a ready task to a free processor core...
Conventional system simulators are readily used by computer architects to design and evaluate their processor designs. These simulators provide reasonable levels of accuracy and execution detail but suffer from long simulation latencies and increased implementation complexity. In this work we propose iQ, a queue-based modeling technique that targets design space exploration and optimization studies...
In order to expand the class of control objects that require executing the complex regulation law, the author proposes a new method of organizing computing activities on the basis of the principle of non-use of the half-adder, the method implies the formation of all the digits of the result during one cycle of machine time. Mathematical models, which organize computations of methodically maximum speed,...
The design of multi-sampling period delay stabilizing controllers is considered for nonlinear sampled-data systems. The Euler model of nonlinear sampled-data systems is used to estimate the current state from multi-sampling period delay state and the desired controllers are constructed by combining the estimated state and the stabilizing controllers without delay. A numerical example is also given...
In this paper a linear time delay systems of retarded type are presented as a potential model that can capture the behavior of human arm movement. The line tracking experiment is designed to validate the performance of the proposed model. The issue of stability of the time delay systems is presented and the critical delays curve is computed to indicate the stable region of the system in the delay...
Cloud computing is a solution to reduce the cost of IT by providing elastic access to shared resources. It also provides solutions for on-demand computing power and storage for devices at the edge networks with limited resources. However, increasing the number of connected devices caused by IoT architecture leads to higher network traffic and delay for cloud computing. The centralised architecture...
Cloud computing has received a significant amount of attentions from both engineering and academic fields. Designing optimal pricing schemes of cloud services plays an important role for the success of cloud computing. How to set optimal prices of cloud resources in order to maximize these CSPs' revenues in an Infrastructure as a Service (IaaS) cloud market while at the same time meeting the cloud...
Sub-threshold circuit is a promising circuit design style for IoT application, but the timing closure, especially hold timing fixing is a big challenge for designers. This paper proposes a mathematical method to estimate the number of insertion inverters/buffers for hold timing fixing in each short path. Firstly, the distribution of path delay is rigorously proved to be lognormal distribution in the...
This paper applies ultra-local models (also labeled intelligent PID) to Automatic Generation Control (AGC) for a Multi-Area power system in the presence of communication delay. The AGC model is built in Simulink/Matlab and co-simulated with Network Simulator 2 (NS2) through PiccSIM, a simulation platform for (wireless/wired) networked control systems. A careful comparison is made between the performance...
Simulation-based fault injection (SBFI) is an indispensable technique for the early verification and dependability assessment of target circuits along the semi-custom design flow. Most precise results can be obtained by models described at the implementation level, as they accurately reflect the functional/timing behavior and the structure of the resulting circuit. These models consist of a list of...
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