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This paper describes the IEC type A (AC only) ground-fault detection circuit and its limitations in accurately detecting electrical ground-fault currents in today's modern electrical installations. Discussed are the effects of waveform modifying power sources and the effect of the DC component on the efficacy of type A safety devices. Limitations of UL1053 standard for ground-fault sensing and relaying...
This paper proposes a novel method to detect the saturation intervals of current transformer (CT) secondary current. The method features the waveform properties of the distorted secondary current, which has abrupt changes where saturation begins and ends. Two algorithms, the improved morphological gradient and the morphological decomposition, are designed to extract the saturation intervals, respectively,...
To avoid the mal-operation of transformer differential protection when external fault occurs with current transformer (CT) saturation, a new algorithm based on the mathematical morphology is put forward in this paper. Unlike the conventional Time Differential Method, the new algorithm only needs detecting the instant of fault occurring, while the instant of differential current appearance is no more...
We explore the use of option contracts as a means of managing and controlling inventories in a retail market. Specifically, merchants can buy option contracts on unsold inventories of retail goods in an effort to hedge, pool, or transfer risk. We propose a new kind of European put option on an inventory where the holder is allowed to freely adjust the original sale price of the underlying good throughout...
This paper is concerned with the problems of positive real analysis and control synthesis for discrete-time systems. New linear matrix inequality (LMI) characterizations of positive realness are derived, which enable one to check the positive realness by using parameter-dependent Lyapunov function. The relationship between the proposed characterizations and the existing ones are clarified, which shows...
In peer-to-peer (P2P) applications, peers make an agreement on one opinion. Agreement procedures have to be so flexible that persons can change their opinions. We discuss a flexible agreement protocol of multiple peers by taking advantage of human behaviors in a fully unstructured P2P network. There are forward, backward, mining, and observation strategies for each peer to find a value to make an...
The reduction of energy consumption in digital subscriber line (DSL) networks has obtained considerable attention recently. Today's DSL is designed under an ldquoalways onrdquo principle to keep the crosstalk noise as stable as possible. Departuring from this restriction, one approach to achieve energy savings is by ldquolazy schedulingrdquo which exploits the tradeoff between energy-consumption and...
This article tackles the problem of estimating the domain of attraction of a Lur'e system, that is the feedback interconnection of a linear time-invariant system with a memoryless static operator. When the dimension of the system is large, numerical approaches based on simulations become prohibitive from a computational point of view. On the other hand, classical analytical techniques based on Lyapunov...
The paper is concerned with the stability analysis of positive feedback interconnections of negative imaginary systems. Firstly, a previously established Negative Imaginary Lemma is shown to remain true even if the transfer function has poles on the imaginary axis. This is achieved by suitably extending the definitions of negative imaginary transfer functions. Secondly, a necessary and sufficient...
This paper deals with the adaptive control of linear systems with periodically time-varying parameters (referred to as LTP systems) in discrete-time. While a large literature exists on the adaptive control of linear time-invariant (LTI) systems, practically very little is known regarding adaptation when the parameters vary periodically. This may be attributed to the fact that adaptive control can...
In this paper we consider the problem of load balancing over heterogeneous networks, i.e. networks whose nodes have different speeds. We assume that tasks are indivisible and with different weights. Our goal is that of minimizing the maximum execution time over nodes. We provide a gossip-based distributed algorithm whose convergence to a bounded set is guaranteed. We show that the convergence time...
This paper deals with the problem of robust stabilization of an uncertain nonlinear system with output measurements using the invariant ellipsoid method. The non-linear system is uncertain but bounded according to a dasiaquasi-lipschitzpsila condition and the output measurements are subjected to perturbations bounded by ellipsoids.The invariant ellipsoid method allows to obtain the robust linear feedback...
The paper presents the design and performance evaluation of a novel navigation solution that merges low-rate delayed GPS measurements with high-rate linear acceleration, attitude, and angular velocity measurements to estimate, in three dimensions, linear motion quantities (position, linear velocity, an acceleration of gravity) of unmanned aerial vehicles (UAVs). The design is based on the continuous-discrete...
Rhythmic movements in animal locomotion appear to exploit a resonance of the body-environment dynamics to maintain high efficiency. To gain insights into the locomotion mechanism, this paper studies a simple three-link undulatory locomotor model that swims through a single joint torque actuator. We have found that, when the locomotor is driven by a sinusoidal input of a given amplitude, the resulting...
In this note we consider the problem of determining necessary and sufficient conditions for the existence of a common quadratic Lyapunov function for a pair of stable linear time-invariant systems whose system matrices are of the form A, A-ghT, and where one of the matrices is singular. We then apply this result in a study of a feedback system with a saturating actuator.
Lur'e systems, that are described by the feedback interconnection of a linear time invariant system and a nonlinear system, form an important class of nonlinear systems arising in many modern applications. A number of absolute stability criteria are available where the stability is guaranteed with the nonlinearity restricted to a pre-specified set. Most of these criteria provide sufficient conditions...
In this article, we study the revenue management problem of multiproduct dynamic pricing in the retail industry. Given a fixed initial inventory and assortment, the retailer monitors the inventory and sets the price to affect the behavior of customer choices over a selling season. We consider the Multinomial Logit (MNL) model of customer choice over substitutes and formulate the problem of optimal...
In this paper, a multiple depot, multiple traveling salesman problem is transformed into a single, asymmetric traveling salesman problem if the cost of the edges satisfy the triangle inequality. This improves on the previously known transformation for a 2-depot, multiple traveling salesman problem in the literature. To test the effectiveness of the transformation, some computational results are presented...
This paper explores two different algorithms designed for quick triangulation in the face of numerous incorrect measurements. The incorrect measurements can be randomly faulty or maliciously converging to an incorrect answer. Both algorithms require the number of correct measurements to exceed a user defined consensus threshold. Both algorithms will correctly terminate in an environment possessing...
In this paper we present a new continuous-time recurrent neurofuzzy network structure for modeling and identification of a class of nonlinear systems, using a training algorithm motivated from previous works in adaptive observers. Using only output measurements and the knowledge of an excitation input signal, the proposed network is trained by generating estimates of an ideal network and jointly identifying...
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