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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)...
Reliability of GaN-based LEDs is attracting researchers to engage in actively. At present, evaluating the lifetime of GaN-based LEDs in a short testing duration is still open question. Thermal and humidity stresses are two main environmental stresses that LED products will suffer infield applications. At the level of devices, LEDs are non-sensitive to vibration. In order to evaluate the reliabilities...
Static Electric Field generated by stable current produced in the seawater surrounding ship has obvious distribution characteristics. We study the extend Kalman Filter to tracking ship with its SE signal. Frist, according to the movement characteristics of the target ship, state space model is built. Ship model is built with point currents line array model. Then, the least squares method is applied...
The number of genome-wide association studies (GWAS) has recently exploded, becoming an important tool in helping researchers comprehend human variation and the role genetic variants play in disease. However, the majority of the GWAS conducted to date have not provided sufficient information to understand the genetic architecture for the usually novel genes identified. Thus, fine-mapping of the exact...
Our research centres on the development of dielectric superlenses and their super-resolution imaging applications. In recent years, we pioneered ‘microsphere superlens (2011)’[1], ‘spider silk superlens (2016)’[2] and ‘TiO2 nanoparticle-made metamaterial superlens (2016)’[3]. These techniques were widely publicized and able to deliver resolution between 45 and 100 nm under white light, well surpassing...
Conventional optical microscopes are restricted by a predetermined limit beyond which it is impossible to resolve distinct points in the objective field. The origin of this limited resolution is associated to the optical diffraction and the loss of evanescent waves in the far field. As a result, objects below this diffraction limit, such as subcellular structures in biology and nanochips in semiconductors,...
With the rapid growth of image transmission over the public networks, image compression and encryption has received increasing attention to reduce the redundancy and ensure security. In this paper, a scheme of image compression and encryption based on vector quantization (VQ) and cross chaotic map has been proposed that simultaneously compresses and encrypts the image based on confusion-diffusion...
In this paper, we present an accurate saliency detection algorithm based on depth feature for 3D images. We first calculate depth cue based on the sharp regions' positions within the depth ranges. Then, the coarse saliency map is computed based on the background and location prior. Finally, we employ the contrast information in the coarse saliency map to obtain the final result. Experimental evaluation...
This paper proposes an improved two-step weighted least squares (TSWLS) algorithm for target location using time difference of arrival (TDOA) with sensor position errors. The performance of the TSWLS method is improved in a simple way through re-selecting reference sensor and rotating co-ordinate system, and the improved TSWLS(I-TSWLS) algorithm remains to be closed-form and approximately efficient...
In traditional pipelined ADCs, errors originated by capacitance mismatch, finite amplifier gain, incomplete settling and offset. To overcome capacitance mismatch for >=2.5-bit/stage MDAC architecture, a new background digital calibration strategy is proposed in this paper. Based on this technique, a 14-bit, 40MS/s pipelined ADC is implemented. The simulation results show that ENOB is improved from...
Traditional optical interference narrow-band-stop filters do not possess wide-angle property, because peaks and troughs of filter spectrum move to short wavelength at non-normal angle of incidence (AOI), which could result in functional failure in particular cases, e.g., blocking of laser for pilot in cockpit during premeditated laser pointer direct. For this reason, we designed a wide-angle metamaterial...
We propose and demonstrate a new class of all-dielectric metamaterial superlens constructed from 3D assembly of high-index nanoparticles (TiO2, ZrO2, Si). The fundamental physics lies in the unusual high efficiency of direct conversion of evanescent waves into propagation waves by the composite media. In Figure 1(a) 3D full wave FDTD simulation was presented for a conventional homogenous material...
Multi-sensor fusion based pose estimation for UAVs (unmanned aerial vehicles) on ships was proposed in this paper. For take-off and landing of UAVs on ships, the novel artificial landmark was presented which could obtain accurate unique result and eliminate the pose ambiguity effectively. IMU data was effectively employed for pose estimation. EPnP algorithm was performed to get the initial estimation...
In this paper, SDA (stacked denoising auto-encoders) model is introduced to solve the aero-engine sensor fault diagnosis problem. This model uses the principle of greedy layer-wise unsupervised training to initialize the network weight, then uses backpropagation algorithm to optimize the network parameters. This model applies SDA to extract features from aero-engine sensor fault signal and softmax...
This paper presents a novel skeleton-based method for deforming meshes, based on an approximate skeleton. The major difference from previous skeleton-based methods is that they used the skeleton to control movement of vertices, whereas we use it to control the simplices defining the model. This allows errors, that occur near joints in other methods, to be spread over the whole mesh, giving smooth...
In this paper, the plan designing of reliability qualification testing for the large-scale machinery products is discussed and the possible influences of the main decision-making parameters are analysed.
The voltage, current and temperature are used as input variables in this paper. The SOC estimation of the lithium iron phosphate battery is achieved by the method of multivariate adaptive regression splines (MARS). The data obtained by the test is standardized, which can be then used in the train of the SOC estimation mathematical model. After that the model is verified. The simulation results show...
The amount of echo data is huge in highly squinted synthetic aperture radar (SAR) imaging with high resolution. To solve this problem, the imaging method for highly squinted SAR with under-sampled echo data based on Compressed Sensing is put forward. Firstly, a Non-linear Chirp Scaling (NCS) imaging method with the Nyquist-sampled echo data is proposed. And then, the NCS operator is established based...
The formation and development of strategic new industries are realized by certain power. It is the growth power of strategic new industries. This paper establishes an incremental probabilistic equation of strategic new industries economic efficiency, and analyses the positive benefits and negative effects on strategic new industries by control theory. The paper proposes that we must increase positive...
Synthetic Aperture Radar (SAR) can bring high range and azimuth resolutions, and is valuable to military and civil usage. Corresponding to the problem that SAR can be easily affected by deceptive jamming, one method based on multiple orthogonal phase codes jittered between neighboring pulses is proposed to anti jamming. Based on Weighted Cyclic Algorithm, long polyphase codes are optimized and then...
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