Traditional patch-based sparse representation modeling of natural images usually suffer from two problems. First, it has to solve a large-scale optimization problem with high computational complexity in dictionary learning. Second, each patch is considered independently learning and coding, which ignores the relationship among patches, resulting inaccurate coding coefficients. In this paper, instead using as basic unit representation, we exploit concept group composed nonlocal patches...

Recently, total variation (TV) based minimization algorithms have achieved great success in compressive sensing (CS) recovery for natural images due to its virtue of preserving edges. However, the use TV is not able recover fine details and textures, often suffers from undesirable staircase artifact. To reduce these effects, this paper presents an improved image CS algorithm by introducing a new nonlocal regularization constraint into optimization problem. The built on well known means (NLM)...

For the output feedback control problem of a Takagi-Sugeno (T-S) fuzzy system with unknown premise variables (UPV) and external disturbances, new observer-based controller H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∞</sub> robust synthesis approach is proposed. To utilize membership functions more effectively, in this article, constructed vector used as variables. Then, error items which are induced by UPV decoupled into T-S system....

In this paper, finite-time attitude coordinated control for spacecraft formation flying (SFF) subjected to input saturation is investigated. More specifically, a bounded state feedback law first developed with the assumption that both and angular velocity signals can be measured transmitted between members. Then, output controller designed addition of filter, which removes requirement measurements. cases, actuator explicitly taken into account, homogeneous system method employed demonstrate...

Controlled hovering of motor driven flapping wing micro aerial vehicles (FWMAVs) is challenging due to its limited control authority, large inertia, vibration produced by strokes, and components accuracy fabrication methods. In this work, we present a hummingbird inspired FWMAV with 12 grams weight 20 maximum lift. We full non-linear dynamic model including the inertia tensor, input mapping, damping effect from counter torques (FCTs) forces (FCFs). also geometric flight controller ensure...

For the stability analysis of a polynomial fuzzy system, new membership function approach is proposed to reduce conservatism. In this article, based on state-feedback closed-loop polynomials fitting method utilized, and an improved transformation technique approximate functions system. Then, membership-function-dependent polynomial-based conditions are derived. The obtained approximation errors will be involved in process. Based sum-of-squares optimization technique, can directly solved....

For the accurate detection of obstacles in complex farmland environments, ResNet50 is adopted as backbone feature extraction network, pyramid network (FPN) utilized to enhance multi-scale fusion capability, and region interest alignment (ROI Align) strategy introduced improve candidate box localization precision. The experimental results show that precision, recall, mean accuracy (mAP) improved model are 91.6%, 89.7%, 93.8%, respectively, which by 2.7, 2.3, 3.1 percentage points compared...

The observer-based controller design for a T-Sfuzzy system subject to external disturbance is investigated in this paper. First, an H∞ observer designed estimate the unknown states, by transformation process states and term, state feedback given. Then, separation principle T-S fuzzy proposed. With help of improved principle, can be combined together make input-state stable, while index also guaranteed. proposed approach applicable both known premise variables. In stability analysis,...

Compressed Sensing (CS) has drawn quite an amount of attention as a joint sampling and compression approach. Its theory shows that signal can be decoded from many fewer measurements than suggested by the Nyquist theory, when is sparse in some domain. So one most significant challenges CS to seek domain where exhibit high degree sparsity hence recovered faithfully. Most conventional recovery approaches, however, exploited set fixed bases (e.g. DCT, wavelet gradient domain) for entirety...

In magnetic coupling resonant wireless power transfer devices, planar spiral coils are often used as the mechanism. such application area, wound sparsely with wide screw pitches and under complex relative position. An accurate model of mutual inductance for either densely or is established in this article. Utilizing Euler Angles, an exact expression a couple arbitrary position proposed. Based on geometric mean distance principle, self-inductance derived. numerical calculation expressions...

A novel coding strategy for block-based compressive sens-ing named spatially directional predictive (SDPC) is proposed, which efficiently utilizes the intrinsic spatial cor-relation of natural images. At encoder, each block sensing (CS) measurements, optimal pre-diction selected from a set prediction candidates that are generated by four designed modes. Then, resulting residual processed scalar quantiza-tion (SQ). decoder, same added onto de-quantized residuals to produce quantized CS...

The aeroelastic analysis of high-altitude, long-endurance (HALE) aircraft that features high-aspect-ratio flexible wings needs take into account structural geometrical nonlinearities and dynamic stall. For a generic nonlinear system, besides the stability boundary, characteristics limit-cycle oscillation (LCO) should also be accurately predicted. In order to conduct wings, first-order, state-space model is developed by combining geometrically exact, anisotropic beam with ONERA (Edlin) stall...

In this paper, attitude coordinated tracking control algorithms for multiple spacecraft formation are investigated with consideration of parametric uncertainties, external disturbances, communication delays and actuator saturation. Initially, a sliding mode delay-dependent controller is proposed under bounded disturbances. However, neither inertia uncertainty nor constraint has been taken into account. Then, robust saturated law further derived, where uncertainties disturbances handled by...

In this paper, a compound control scheme with linear active disturbance rejection (LADRC) and nonlinear (NLADRC) is designed to stabilize the speed system of marine engine. To deal high nonlinearity complex noise conditions in engines, advantages both LADRC NLADRC are employed. As extended state observer (ESO) affected severely by inherent characteristics (cyclic fluctuation, cylinder-to-cylinder deviations, etc.) reciprocating cycle-detailed hybrid engine model adopted analyze impact such...

In this paper, finite-time output feedback coordinated attitude control for spacecraft formation subject to input saturation is investigated. More specifically, a observer first designed remove the requirement of measureable angular velocity. Rigorous proof shows can achieve stability within given attractive region, which implies that estimated values be taken into use instead real velocity after certain convergence time. Then, bounded law render each converge reference provided by virtual...