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Optimal operation space of heat exchanger networks (HENs) is largely influenced by either their hard constraints or limitation of operation margin when a bypass or utility unit is selected as a manipulated variable (MV), but previous methods generally focused on solving the identification of inactive bypasses and active pairings in sequence, wherein the inactive bypasses features hard constraints...
In the high-power LED driver system, a single-stage boost-LLC type soft-switched AC-DC converter is usually employed for obtaining the high efficiency and low cost. However, the high bus voltage is its fatal disadvantage due to the PFM control strategy. Thus, this LED driver is only applied in the low ac input voltage case. In order to overcome this problem, an asymmetric PWM (APWM) feed-forward strategy...
Binary Exponential Backoff (BEB) algorithm is utilized to resolve the channel contention for IEEE 802.11 wireless networks. However, BEB algorithm does not meet the user expectation due to the large collision probability and the poor network fairness when the number of stations is large. To overcome the problems, a novel synchronized contention windows-based backoff algorithm is proposed, i.e., SCW...
MIMO control performance assessment (CPA) and diagnosis have been attracted more and more attention for its importance in control theory and industrial process. A PCA Based performance diagnosis method is presented with respect to the corresponding eigenvector. The proposed algorithm is evaluated by application to the simulation process.
In Independent Component Analysis (ICA) and its diverse algorithms, uniqueness is the most essential requirement and rationality problem compared with performances of existence, stability and convergence. For ICA's maximum non-Gaussianity estimation (MNE), many achievements have been made in recent twenty years based on uniqueness assumption, which has been taken for granted all along except for some...
Performance assessment is important for control parameter optimizing and control quality improvement. So an algorithm for the system performance assessment is proposed. Firstly, time scale choosing method is given in minimum variance algorithm which based on the Laguerre model for systems with stochastic disturbance only. Then for set point tracking systems with stochastic disturbance, calculation...
This paper presents a receiver structure which exploits spatial diversity by adaptive multichannel combining, which improves the performance of passive time reversal communications realized by passive phase conjugation (PPC). The bidirectional decision feedback equalizer (BiDFE) replaces the classical DFE to eliminate inter-symbol interference (ISI). The presented structure takes advantage of pulse...
In this paper, we employed a new variant of particle swarm optimization (PSO) technique named quantum PSO (QPSO) to search for optimal parameters of chaotic system by minimizing errors between the model's evaluated outputs and the actual ones. The performance of the QPSO is tested via simulation in Matlab. Identification results aptly show that the QPSO algorithm has the advantage of high parameter...
Antenna arraying is an efficient method to increase antenna equivalent gain in deep space telemetry tracking and command (TT&C) applications where the signal to noise ratio (SNR) is so low that the received signals from the space craft can not be efficiently processed at the receiver. Combining efficiency is the key factor to determine which combining method can be employed for antenna arraying...
A sparse channel estimation method using compressed sensing (CS) is proposed for zero padded single carrier block transmission (ZP-SCBT) system employed in sparse wireless channels. We formulate the sparse channel estimation in ZP-SCBT system as a canonical CS problem, and optimize the measurement matrix by minimizing the mutual incoherence property (MIP), binary sequences with optimal aperiodic autocorrelation...
The overhead caused by virtualization makes it difficult to apply VM in the applications which require high degrees of both performance isolation and efficiency, such as the high performance computing. In this paper, we present a lightweight virtual machine, named Solo. It simplifies the design of VMM greatly by making most privileged instructions bypass the VMM, except the I/O operations. Solo allows...
An algorithm to detect and estimate frequency hopping signal corrupted by white Gaussian noise is presented. The proposed algorithm is based on atomic decomposition and information theoretic criterion. The stopping criteria of atomic decomposition is supplied by modified information criterion. Detection and parameter estimation are performed after atomic decomposition. Numerical experiments have shown...
The parameter estimation of frequency hopping signals under non-cooperative conditions is a key problem to which more attentions are being paid in the field of signal processing. According to the structure of frequency hopping signals, three-parameter time-frequency atoms were obtained from Gabor functions by successive applications of scaling, time-shift and frequency-shift operators, and a new atomic...
In this paper, an electromagnetic wave tool is applied to measure the resistivity of inhomogeneous media. All the media have cylindrical symmetry. A section of a media model, medium 1 is one kind of fluid medium, and other media are solid media. During the measurement, the tool is placed in the fluid medium, and moved from the bottom to the top
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