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In this paper we propose a new method for the design of the full order H∞ filter for a class of linear singular delayed systems with unknown inputs and bounded disturbances. The proposed procedure is based on the unbiasedness of the state estimation error and on the Lyapunov-Krasovskii stability theory, where the optimal filter gain implemented in the proposed design is a solution of linear matrix...
Vehicular Ad hoc Networks (VANETs) have gained considerable attention in recent years because of the extensive applications. However, VANETs are confronted with numerous difficulties and challenges, which lead to communication performance degradation and even data delivery failure. In this paper, we propose a new routing protocol called Intersection-based Delay sensitive Routing using Ant colony optimization...
In this paper, we propose the implementation of PID on Networked Control System (NCS) using Particle Swarm Optimization (PSO) algorithm as tuning method. There are three modification of PSO that used in this paper. The first is Constant Inertia Weight of PSO (CIW-PSO), the second is Linear Difference Weight of PSO (LDW-PSO), and the latest is Random Inertia Weight of PSO (RIWPSO). In the end, we present...
This paper explores the impact ground delay can have on designing and executing rendezvous operations such as formation flight. For a given formation pairing the route is fixed, speed policies are then generated to compensate for uncertainty in take-off times. Value Iteration is used to solve both the deterministic and stochastic Dynamic Programming problem for an entire state-space. The final optimal...
This paper present an analytical model of delay for subthreshold voltage to time converters (VTCs). The model characterizes an equation between the input voltage and output delay. Delay prediction model can be used to compute delay and understand characteristic of VTC in subthreshold region. Simulations are done in 0.18um CMOS technology and results ensure the accuracy of the model.
This paper deals with the state observer design problem for a networked control linear system. First, based on a functional transformation to the system output, the networked control system with both network transmission delays of controller-to-actuator and sensor-to-controller was transformed into an equivalent system with only delayed control inputs. Then, by using the transformed system, a state...
Designing a robust, queue model for networking architectures is both complex and challenging. Validity, fairness and generality are key success elements in each examined modeling scheme. In this paper, we present a working scheme refered to as Network Queue Set Theory (NQST), based on Continuous Time Markov Decision Process (CTMDP) and Set Theory. From this original work, we delineate the referenced...
This paper is concerned with the problem of networked fault detection for the networked control system (NCS). As for the output time delay in the feedback channels for the network between the plant and the controller, so at the controller site, the actual output of current time instant cannot be gotten. This paper makes use of self-adaptive predictor technique of online identification predicting the...
As supply voltage is reduced, a power constrained test clock can be sped up in spite of the increased delay of the circuit. However, a large reduction in voltage makes the operation structurally constrained, requiring the clock to slow down. We determine an optimum supply voltage that allows fastest clock speed for a given power limit. Examples show that the test time can be reduced by as much as...
Period selection based techniques for resource distribution among concurrent control tasks have gained significant research interest in the last decade. The application of these techniques in the networked control environment may give rise to an asynchronous data communication between the sensor and the controller and may result in a variable delay in the loop. This work investigates the degrading...
The overall system cost and other considerations require that processors deliver high performance within a given power budget. Pipelining and supply voltage, both affect the performance and power consumption. Therefore, pipelining depth can be varied simultaneously with appropriate adjustments in supply voltage so as to keep power consumption constant while affecting performance of a processor. This...
A Wallace tree multiplier using Booth Recoder is proposed in this paper. It is an improved version of tree based Wallace tree multiplier architecture. This paper aims at additional reduction of latency and area of the Wallace tree multiplier. This is accomplished by the use of Booth algorithm and compressor adders. The coding is done in Verilog HDL and synthesized for Xilinx Virtex 6 FPGA device....
This paper presents a Reconfigurable Parallel Prefix Ling Adder. The proposed design can be partitioned to perform as one 16 bit, two 8 bit and four 4 bit adders. We also propose a new architecture for Enhanced Flagged Binary Adder (EFBA) designs which reduces the delay of operation considerably. The new adders are, therefore, modifications of conventional Reconfigurable Carry Lookahead Adder (CLA)...
The problem of identifying dynamical models on the basis of measurement data is usually considered in a classical open-loop or closed-loop setting. In this paper this problem is generalized to linear dynamical systems that operate in a complex interconnection structure and the dynamical relationships between the measured variables signals need to be identified. It is shown that the classical Direct...
Handling delays and uncertain parameters in control systems is difficult and of long-standing interest. In this paper, we consider the problem of stabilizing any single-input single-output (SISO) linear time invariant (LTI) controllable/observable plant with an arbitrarily large uncertain gain and time delay; to do so, we propose a non-linear time varying (NLTV) controller. Despite being NLTV, the...
In this paper we discuss the rescheduling of trains on a large-scale railway network in the case of perturbations using a max-plus-linear system description. We study the structure of the system matrices and derive how this structure can be manipulated by the control variables. In addition, we show that this leads to a system matrix that is affine in the control variables and the timing parameters...
Timeout control is a simple mechanism used when direct feedback is either impossible, unreliable, or too costly, as is often the case in distributed systems. Its effectiveness is determined by a timeout threshold parameter and our goal is to quantify the effect of this parameter on the system behavior. In this paper, we extend previous results to the case where there are N transmitting nodes making...
This paper deals with fast input-free partial state estimation for discrete-time LPV systems through functional observers. The system inputs are assumed to be unknown and then the observers reduce to functions of finite sequences of the output only. The existence of the observer is proved by resorting to both the notion of inverse system and the concept of maximal A-invariant subspaces. A constructive...
This paper deals with the input-to-state practical stabilization of nonlinear systems described by neutral functional differential equations in Hale's form, affine in the control input. An unknown, Lebesgue measurable, locally essentially bounded disturbance adding to the control law, which describes actuator and general control design errors, is considered. The Arstein-Sontag approach, integrated...
In this paper, we propose an adaptive observer for nonlinear systems with slope restricted nonlinearities, unknown parameters and delayed outputs. The delay is assumed constant and the unknown parameter is assumed piece-wise constant. Based on the Lyapunov-krasovskii approach, we show that, for sufficiently small values of the time-delay, both state estimation and parametric convergence are ensured...
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