In recent years, fractional order systems have attracted more and more attention in various field, studies on real systems have revealed inherent fractional order dynamic *** is intuitively true that these fractional ...
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In recent years, fractional order systems have attracted more and more attention in various field, studies on real systems have revealed inherent fractional order dynamic *** is intuitively true that these fractional order models require the corresponding fractional order controllers to achieve excellent *** this paper, a fractional order P Dμcontroller is designed systematically,to control a class of fractional order systems, the performance of the proposed P Dμcontroller designed for the fractional order system is compared with both the integer order and fractional order controllers which are designed for the approximate integer order system in the simulation and the hardware-in-the-loop experiment respectively.
Parallel magnetic resonance imaging (pMRI) cannot achieve its maximum reduction factor due to practical limitations. The combination of pMRI and distributed compressed sensing (DCS) for further acceleration is of grea...
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Parallel magnetic resonance imaging (pMRI) cannot achieve its maximum reduction factor due to practical limitations. The combination of pMRI and distributed compressed sensing (DCS) for further acceleration is of great interest. In this paper, we propose a method to combine SENSitivity Encoding (SENSE), one of the standard methods for pMRI, and M-FOCUSS, an algorithm solving DCS reconstruction problem. The proposed method first employs MFOCUSS algorithm to simultaneously reconstruct a set of aliased reduced field-of-view (FOV) images for each channel, and then applies Cartesian SENSE to reconstruct the final image. The experimental results demonstrate that the proposed method outperforms the existing methods with the same reduction factor.
at present the non-contact stress sensor which can be choose are not many, so it is necessary to develop the new non-contact stress sensor. A new kind of the noncontact stress sensor based on magnetoelastic effect wit...
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at present the non-contact stress sensor which can be choose are not many, so it is necessary to develop the new non-contact stress sensor. A new kind of the noncontact stress sensor based on magnetoelastic effect with three magnetic poles is designed in this paper. The author first discussed the structure and the operation principle of the sensor, then derived its induced voltage output equation, finally through the experiment, analyzed the exciting current intensity, the frequency as well as the test magnet gap and so on to its input level influence. The results of the test have showed that the sensor has high measuring precision and sensitivity and it can meet the demands of the general practical application.
In this paper we present a novel decentralized algorithm to estimate the eigenvalues of the Laplacian of the network topology of a multi-agent *** basic idea is to provide a local interaction rule among agents so that...
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In this paper we present a novel decentralized algorithm to estimate the eigenvalues of the Laplacian of the network topology of a multi-agent *** basic idea is to provide a local interaction rule among agents so that their state oscillates only at frequencies corresponding to eigenvalues of the network *** this way,the problem of decentralized eigenvalue estimation is mapped into a problem of signal processing,solvable by applying the Fast Fourier Transform(FFT).
In this paper, we proposed the user's relevance feedback technology to reflect the degree of user's preferences of what he liked. Reference feedback contains the positive and negative feedback rank. User's...
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In this paper, we proposed the user's relevance feedback technology to reflect the degree of user's preferences of what he liked. Reference feedback contains the positive and negative feedback rank. User's relevance feedback rank can derivate as the User's preference. The personal preference and general preference could be considered in this paper. The dynamic re-ranking result will refer to represent the media.
A systematical design method for robust integer order proportional-integral-derivative(IOPID) controller with an iso-damping property was suggested in [3]. In this paper, two auto-tuning methods of Fractional Order Pr...
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A systematical design method for robust integer order proportional-integral-derivative(IOPID) controller with an iso-damping property was suggested in [3]. In this paper, two auto-tuning methods of Fractional Order Proportional Integral(FOPI) and Fractional Order[Proportional Integral](FO[PI]) controllers with iso-damping property for a class of unknown, stable and minimum phase plants are designed and summarized. The FOPI and FO[PI] controllers designed by the two methods ensure that the phase Bode plot is flat, i.e., the phase derivative w.r.t. the frequency is zero at a given frequency called the "tangential frequency", so that the closed-loop system is robust to gain variations and the unit step responses exhibit iso-damping property. During the process of the FOPI and FO[PI] controllers design and simulation, no plant models are assumed. Several relay feedback tests are used to identify the plant gain and phase at the tangential frequency in an iterative way. Simulation results are presented to validate the proposed auto-tuning methods for robust FOPI and FO[PI] controllers with isodamping property.
In this paper,a high-gain nonlinear observer based fault diagnosis approach is proposed for a general class of nonlinear uncertain *** nonlinear system under consideration contains parameter uncertainties as well as L...
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In this paper,a high-gain nonlinear observer based fault diagnosis approach is proposed for a general class of nonlinear uncertain *** nonlinear system under consideration contains parameter uncertainties as well as Lipschitz-like nonlinearities and may be harmed by time-varying *** fault diagnosis algorithm is designed based on a new adaptive estimation method for estimation of the parameters related to *** main result is given in a constructive manner by developing a novel nonlinear adaptive observer,without resort to any *** design of the proposed observer does not necessitate the resolution of any dynamics systems and its expression is explicitly *** global exponential convergence is ensured,which does not rely on solving any kind of dynamic Riccati equation.A simulation example is given to illustrate the efficiency of the proposed fault diagnosis method.
The stability of Boolean networks and the stabilization of Boolean control networks are *** semi-tensor product of matrices and the matrix expression of logic,the dynamics of a Boolean(control) network can be converte...
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The stability of Boolean networks and the stabilization of Boolean control networks are *** semi-tensor product of matrices and the matrix expression of logic,the dynamics of a Boolean(control) network can be converted to a discrete time linear(bilinear) dynamics,called the algebraic form of the Boolean(control) *** provide a framework for this *** results consist of two parts:(i) Using logic coordinate transformation,the known sufficient condition based on incidence matrix has been *** is also used in stabilizer design.(ii)Based on algebraic form,necessary and sufficient conditions for stability of Boolean networks and stabilization of Boolean control networks respectively are obtained.
Orthogonal frequency division multiplexing(OFDM) is the key component of many emerging broadband wireless access *** resource allocation in OFDM uplink,however,is challenging due to heterogeneity of users' quality...
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Orthogonal frequency division multiplexing(OFDM) is the key component of many emerging broadband wireless access *** resource allocation in OFDM uplink,however,is challenging due to heterogeneity of users' quality of service requirements,channel conditions,and individual resource *** formulate the resource allocation problem as a non-strictly convex optimization problem,which typically has multiple global optimal *** propose a reduced primal-dual algorithm,which is distributed,requires simple local updates,and probably globally converges to a global optimal solution under easily satisfied sufficient technical *** performance of the algorithm is studied through a realistic OFDM simulator based on field *** with the previously proposed standard primal-dual algorithm,the reduced algorithm decreases the total number of iterations by 80%and the variance by 85%.
Clustering techniques in routing protocols is an effective topology control approach, which can increase the scalability of wireless sensor networks and efficiently utilize the limited energy resources of the sensor n...
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ISBN:
(纸本)9781424442843
Clustering techniques in routing protocols is an effective topology control approach, which can increase the scalability of wireless sensor networks and efficiently utilize the limited energy resources of the sensor nodes. However, the problem of the hot spots exists in current clustering algorithms. When cluster heads corporately forward the data packets to sink with multi-hop communication, some cluster heads tend to die earlier due to heavy relay load, which results in the network being partitioned. We present a novel node deployment and clustering scheme based on unequal density (UDNDC) for wireless sensor networks. The more nodes are deployed in the area with more relay traffic, thus they can provide enough energy for the inter-cluster data forwarding. Simulation results show that UDNDC effectively balances the energy consumption among network nodes and obviously prolongs the network lifetime.
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