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In large wireless sensor networks, randomly deployed nodes have to organize themselves as energy efficient as possible to avoid redundant sensor and transceiver operations. In addition to its energy awareness, the network has to guarantee complete functionality as long as possible. This paper presents an enhanced version of the clustering algorithm 2-MASCLE. The proposed 4 MASCLE algorithm combines...
This paper describes an interconnection scheme and its associated mapping method, used to program complex functions onto reconfigurable architectures, based on nanoscale logic cells. To interconnect such fine-grain logic cells, classical techniques are not suitable because of a large overhead. Therefore, we propose the use of static and incomplete interconnection topologies. We also propose a method...
This paper addresses capacitated location-routing problems (CLRP). Those distribution network design problems involve depot (or hub) location, fleet assignment and routing decisions. The distribution networks under investigation are characterized by several depots, by a capacitated homogeneous vehicle fleet and by a set of customer nodes to be serviced with demands. The objective is to assign the...
Testing of current devices in the automation domain cannot be done mathematically exhaustive due to the huge number of possible test cases and, even more important, the tremendous amount of time for the execution of all test cases.Thus, a dramatic reduction is needed in the testing domain.This paper discusses two possibilities for the reduction of test case execution time by reducing the number of...
Previously introduced slow-fast decomposition bumpless transfer is extended to 2-degree-of-freedom configuration of candidate controllers. An easy implementation with observable canonical form of slow modes controllers is introduced. For controllers that have only fast modes, an uncontrollable-slow-modes state augmentation technique is provided. Simulations demonstrate comparative advantages over...
A novel VNA automatic calibration structure has been created that improves the performance of the transfer calibration to 70 GHz and down to kHz-scale frequencies. While over-determined methods have been used for years, the presented structure uses a newer switching arrangement to minimize losses and parasitics thus reducing standards proximity issues. Additionally, the use of semi-transmissive reflection...
This paper introduces a novel control law that is generic in nature and stabilizes linear and a class of non-linear systems. The parameters of the proposed controller give the same flexibility of tuning the transient response of a system as the standard PID does. The superiority of the output-prediction based proportional switching (OPPS) controller lies in the fact that it addresses the fundamental...
In this paper, an innovative approach for the reduction of the sideband level in time-modulated linear array has been presented. First, the proposed strategy has been mathematically justified showing that the SBL can be lowered by modifying the switch-on instants. Accordingly, a PSO has been used to minimize a suitable cost function quantifying the mismatch between the actual pattern features and...
We extend the probabilistic key-based approach for wireless sensor networks concerning the slow rekeying and path key reestablishment processes. By introducing a novel, energy efficient, distributed, and faster scheme, we attempt to replace the existing ordinary rekeying method of probabilistic key management scheme through a deterministic algorithm that works on both the base station and on each...
We describe a new outphasing transmitter architecture in which the supply voltage for each PA can switch among multiple levels. It is based on a new asymmetric multilevel outphasing (AMO) modulation technique which increases overall efficiency over a much wider output power range than the standard LINC system while maintaining high linearity. For demonstration, the overall transmitter is simulated...
For the problem of stabilizing an inverted pendulum with restricted travel, a saturating control law is developed that satisfies the amplitude constraint on the cart and has a large region of attraction. The explicit expression of the region of attraction is also obtained. The analysis and design are performed based on the linearized model of the system, as in the study of Lin et al. The control law...
This paper is concerned with the problem of Hinfin filter design for a class of linear uncertain systems with time-varying delay. The uncertainty parameters are supposed to be time-varying, unknown, but bounded, which appear affinely in the matrices of system model. Our proposed robust Hinfin filter is a switching-type filter, in which the filter parameters are tuned in a switching manner via a switching...
In this paper a simplified isolated controlled intersection is introduced. Discrete-event piecewise affine (PWA) and discrete-event max-plus models are proposed to formulate the optimization problem for the switching sequences. Two control problems are considered: steady-state control and N-stages control. The formulated discrete-event PWA and maxplus problems are converted to be solved by linear...
In this paper we consider the problem of designing a multi-controller K that consists of a family of stabilizing controllers {Km}m=1n, where each controller Km belongs to a constrained set Km. Our goal is to determine the controllers {Km}m=1n (and an associated switching trajectory if switching is controllable) to optimize the closed-loop system performance. Based on a special implementation of...
This paper studies the discrete-time switched LQR (DSLQR) problem using a dynamic programming approach. Efficient algorithms are proposed to solve both the finite-horizon and the infinite-horizon suboptimal DSLQR problems. More importantly, we establish analytical conditions under which the strategies generated by the algorithms are stabilizing and suboptimal. These conditions are derived explicitly...
This paper describes IGBT and FWD design concept and measured results for the application of magnetic energy recovery switch (MERS) configuration for the first time. Since the switching frequency in the MERS application is so slow of 50-60 Hz that a lower on-state voltage drop is strongly required for the IGBT and FWD chips even though their fast switching features are sacrificed. Therefor e, the...
In this paper we develop dissipativity theory for discontinuous dynamical systems. Specifically, using set-valued supply rate maps and set-valued connective supply rate maps consisting of locally Lebesgue integrable supply rates and connective supply rates, respectively, and set-valued storage maps consisting of piecewise continuous storage functions, dissipativity properties for discontinuous dynamical...
We consider switched singular linear systems and determine the set of reachable/controllable states. We derive necessary and sufficient conditions for such a system to be reachable/controllable when an ldquoequisingularity conditionrdquo holds.
The problem of keeping performance errors within bounds while controlling a perturbed open loop linear system is considered. The objective is to maximize the time during which performance errors remain acceptable, given that the controlled system is within a specified neighborhood of its nominal parameter values. It is shown that the optimal solution is associated with a switching function z(t) which...
This paper addresses the problem of synchronization errors in distributed dynamical systems. In particular, it focuses on the question of stability for the case where all subsystems have the same sampling frequency, but different switching times. In contrast to previous work, the approach taken here models the set of system matrices that arise using a polytopic uncertainty approach, where a polytope...
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