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Proliferation of mobile terminals pushes the limits of scalability, capacity and coverage to unremittingly sustain V2X services. Massive machine type communication has the potential to ensure the autonomous sustainability of stream QoS. Catering for diversified packet-based traffic flows in a ubiquitous framework dictates the inline evaluation of the queue status, a complex and arduous task for scalable...
Comparators are a critical element of Analog-to-Digital converters (ADCs) intended to operate in a harsh environments such as the automotive. The influence of temperature on key comparator properties such as the delay must be well understood to maximize their speed. In this paper a Double-Tail latch analysis leads to an analytical expression for the delay to more accurately guide the design over a...
This paper studies Trust in real-time distributed database systems. High availability and fault-tolerance are important aspects of these real-time systems and are commonly achieved by replication. Different existing replication techniques are compared in this paper in terms of implementation and limitations. Also, a new replication technique; TIRS; is proposed that relies on Trust when reading or...
We study a mathematical model of cohabitation of healthy and unhealthy stem cells, in order to address some new biological concerns. In short, we will investigate the existence and the stability properties of a positive steady state of a model that is well adapted to the study of dormancy of cancer stem cells. Mathematically, we are concerned with the analysis of a nonlinear retarded system coupled...
Microgrids gathered a lot of attention in the last decade and are believed to be the future power systems. The renewable energy sources can be easily integrated into the Microgrid. Renewable energy sources such as PV, wind and fuel cells are usually connected through voltage-source inverters in the Microgrid. In order to share the same loads, these inverters are connected in parallel and to achieve...
A new mathematical model that represents the coexistence between normal and leukemic populations of cells is proposed and analyzed. It is composed by a nonlinear time-delay system describing the dynamics of ordinary stem cells, coupled to a differential-difference system governing the dynamics of mutated cells. A Lyapunov-like technique is developed in order to investigate the stability properties...
Management of overflows caused by stochastic traffic arrivals is one of most important consideration for traffic signal control of isolated intersection because overflows of one cycle can results in not only extra delay in following cycles but also blocking of upstream intersections. Although the stochastic arrivals problem has been studied either by simulation based methods or analytical models,...
A multiple delayed model of HIV infection has been proposed in this paper. The first delay explains the time for an uninfected cell to become infected. This delay is termed as intracellular delay. The second delay known as the immunological delay describes the immune activation time. The basic reproduction number for the model has been given and the local stability analysis has been performed. The...
Software-defined networking (SDN) are the rising technology in near future to build programmable networks as a way to simplify the evolution of networks. It is a new networking paradigm with the main aim is to decouple forwarding hardware from control decisions. Several SDN architectures have been recently proposed and evaluated. Performance evaluation of these architectures, to study their scalability,...
Performance comparison of various Packet Scheduling (PS) algorithms such as Proportional Fair (PF), Maximum Largest Weighted Delay First (MLWDF) and Exponential/Proportional Fair (EXP/PF) has been studied in HetNets environment. The performance indicators such as throughput, Packet Loss Ratio (PLR), delay and fairness are considered to judge the performance of the scheduling algorithms. Various strategies...
Visible Light Communication (VLC) is a new emerging technology, where delay is a Quality of Service (QoS) criterion for communication. This paper presents an analysis of the theoretically possible end-to-end delay and hop number for Light on Demand (LoD) and VLC-based multihop networks. Taking the human eye perception as a relevant parameter, total delay is analyzed at the Open Systems Interconnection...
We study chemostat models with constant substrate input concentrations. We allow growth functions that are not necessarily monotone. The measurement is the substrate concentration, which is piecewise constant with a nonconstant delay, so only sampled observations are available. Under new conditions on the size of the delay and on the largest sampling interval, we solve the problem of asymptotically...
Novel cloud computing technology makes multiplayer cloud gaming a reality, where players play games that do not run on local devices, but on servers in the cloud. Nevertheless, the necessary communication between player's local device and cloud server increases the response delay of the gaming session. Besides the degrade of responsiveness, the inter-player delay, which is the difference of response...
A new transmission failure model for Avionics Full-Duplex Switched Ethernet (AFDX) is established in this paper. It aims at quantifying the transmission failure with the real-time considerations. Using the statistical mean field theory, the failure function with the traffic dynamics considerations is determined. Simulation results can verify the effectiveness of our model. This study can contribute...
Wireless Sensor Networks (WSNs) come across various challenges when it comes to its design and operations which cause major degradation in their performance. With increasing number of applications having their own different limitations, make the challenge of application expectations even greater for such resource limited networks. These challenges appear at different layers of WSNs starting from physical...
Digital computations and calculations is involved in every embedded and processing device, these devices has arithmetic logic unit or a special block to perform a desired operation, Addition can be one such operation, adders are most important and fundamental block used for Addition, Subtraction, Multiplication, Division, Address generation and so on, design and selection of adders for a embedded...
The objective of this paper is to design a robust PI controller for a second order system plus delay (SOSPD) which has an inherent nonlinearity by the virtue of its structural dynamics. An example of Dual Spherical Tank Liquid Level System (DSTLLS), which is non linear, has been chosen to analyse the performance of the robust PI controller designed. The DSTLLS has been linearized and modelled using...
This paper presents a mathematical model of direct drive system. Includes a four-mass structure for the mechanical part. Discusses how to identify the mechanical resonance frequency using two signals: PRBS (pseudo random binary sequence) and chirp. The result is a nonparametric model from which is determined the resonant frequency. Knowledge of resonance frequencies allows to tune determine digital...
In this document we implemented several digital and filtering techniques in real time using Xilinx Zynq-7010 FPGA To achieve this we use a high level programming language like NI LabView to generate the VHDL that will be recorded in the hardware. We expose the mathematic characteristics of each one of the effects and the impact in the processing of the audio signal. We also compare with those we obtained...
The ability to estimate performance metrics such as latency (delay) at an early stage of final implementation in any embedded system is essential for efficient design specially realtime systems. Constructing performance models and evaluation techniques of a given system requires a significant effort. This paper presents a mapping scheme between a Functional Modeling Approach such as FSM, UML etc and...
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