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How to design an optimal mixed H2/H∞ robust FID controller for a complex control system is of great practical importance, but it is still an open issue. From the perspective of evolutionary algorithm, this paper formulates this issue firstly as a typical constrained optimization problem by minimizing a weighted objective function consisting of the robust stability performance, disturbance attenuation...
How to design an effective and efficient load-frequency controller (LFC) for a multi-area interconnected power system to improve its power quality is a challenging issue. In order to deal with this issue, this paper presents a novel distributed fractional-order PID (DFOPID) control method for the load-frequency control of each area by using an adaptive population-based extremal optimization (APEO)...
In this paper, a new design of Terahertz (THz) Ring Hybrid Coupler Based on Parallel Plate Dielectric Waveguide with Signal Line inserted (PPDWS) is proposed. The PPDWS is a simple transmission line, easy to fabricate, with a low average loss of 0.45dB/mm at 1–1.4THz, and designed to be implemented into the THz Ring Hybrid Coupler Design. We employ (3N+1.5)λ for the circumference of the Ring Hybrid...
The optimal thermal design issue of a forced aircooled heat sink to obtain satisfied performance indices such as thermal resistance, pressure drop, geometry, total weight and cost is great of practical value for the stable and safe operations of a power electronic equipment. This paper formulates this issue firstly as a typical constrained optimization problem by considering the entropy generation...
The heating and cooling is very complex process for winding in large power transformer, which involves fluid dynamic, manufacture technology and numerical heat transfer and other related disciplines. Recently, the electromagnetic-Fluid-thermal coupled method and thermal network method are widely used by domestic and foreign researchers, whereas the oil flow distribution can not be taken into account...
Large-scale photovoltaic(PV) generation system connected to HVDC grid has many advantages compared to its counterpart of AC grid. DC connection can solve many problems that AC connection faces, such as the grid-connection and power transmission, and DC connection is the tendency. DC/DC converter as the most important device in the system, which has become one of the hot spots recently. There are many...
Transformer short-circuit force insufficient has been a hot research issue. There is some residual stress on the conductor section when winds the wounding, which produces adversely affect on winding short-circuit strength. This paper deduces the calculation model of the circular winding considering the residual stress. Taking the test transformer as an example, winding internal radiation short-circuit...
Cooperative detection system, which combines selforganizing network and single radar system, improves the ability of cooperative localization by distributed multi-node using multi-direction scattering power of target. Multiplehypothesis (MH)-Based Algorithm for Target Localization finds all possible targets using multi-path echo information with unknown number of targets, and realizes multi-target...
To meet the requirements of flexible and wearable electronic devices, strain sensors with high sensitivity, stretchability and reliability are essential prerequisite. In this work, we developed a strain sensor of resistance type, which is composed of standing multi-walled carbon nanotube (MWCNT) network, reinforced by PDMS film. Benefiting from the standing MWCNT network structure, the strain sensors...
For compact multiple-input multiple-output (MIMO) active sensing applications, the issue of how to arrange the transmit and receive antenna elements in order to obtain a sparse linear array configuration design is considered. The principle of aperture synthesis is presented and a modified genetic optimizing algorithm is used with the fitness function being constructed. At last, Numerical results are...
Fractional order control theories have attracted increasing attentions recently due to their better control performance than traditional integer-order controllers, but there are few research works concerning their applications of power systems and power converters. This paper presents a novel binary-coded extremal optimization (BCEO) based fractional-order frequency control method for an islanded...
We propose an effect size based approach to compute initial dissimilarities for Ensemble Algorithm of Clustering Cancer Data (EACCD). The proposed method is applied to the colon cancer data from the Surveillance, Epidemiology, and End Results (SEER) Program of the National Cancer Institute and compared with the log-rank approach where initial dissimilarities are computed from the log-rank test statistic...
In this paper, we propose a 1-bit Full Adder circuit built with Ballistic Deflection Transistors (BDT). BDT is a disruptive technology based on AlGaAs/InGaAs heterostructure. Different combinational circuits were successfully realized using BDT NAND gate and General Purpose Gate (GPG) structures. The developed circuit is an extension of BDT GPG and different from that of the previously implemented...
As one of the most popular and successful methods in industrial applications, model predictive control (MPC) has attracted increasing interest in the past two decades. However, one of open issues in this research filed is how to solve the constrained nonlinear optimization problems in MPC. From the perspective of evolutionary algorithm, this paper presents a novel population extremal optimization...
This work presents a self-powered liquid flow and bubble detection sensor based on the effect of contact-electrification between liquid and solid interface. Charge is driven by the electrostatic induction to flow across outer load without power supply. Single-step fluorocarbon plasma treated PDMS with wrinkle pattern is employed to contact with liquid, which could enhance the electric performance...
With the advent of cloud storage, the cloud service brings a lot of convenience, but it also brings some secure issues. In order to realize the confidentiality and integrity of speech content stored in the cloud, an efficient watermarking based on integer wavelet transform in encrypted domain is proposed. Firstly, the original speech is scrambled by chaotic mapping. Then, the integer wavelet approximate...
In this paper, we try to solve site selection problem for building meteorological observation stations by recommending some locations. The functions of these stations are meteorological observation and prediction in regions without these. Thus in this paper two specific problems are solved. One is how to predict the meteorology in the regions without stations by using known meteorological data of...
Human 3D pose estimation from a single image is a challenging task with numerous applications. Convolutional Neural Networks (CNNs) have recently achieved superior performance on the task of 2D pose estimation from a single image, by training on images with 2D annotations collected by crowd sourcing. This suggests that similar success could be achieved for direct estimation of 3D poses. However, 3D...
This paper proposes a microwave single-pole double-throw (SPDT) T/R switch integrating bandpass response. The series-parallel configuration of p-i-n diodes embedded into the impedance matching circuit is proposed to combine two quasi-elliptic response bandpass filters to constitute the proposed SPDT T/R switch. To validate our design approach, a proposed SPDT T/R switch integrating bandpass response...
The load characteristic of oil pumping unit has been analyzed in this paper. According to the variation feature of power to time in oilfield distribution network that active power may vary as sine curve and reactive power may be a constant, different pumping units that connected in the same transformer equal to an equivalent single pumping unit. The approximate power loss equation of oilfield distribution...
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