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A modular approach of the estimation-based design in the adaptive linear control systems has been extended to the adaptive robust control of strict-feedback stochastic nonlinear systems with additive standard Wiener noises and constant unknown parameters. Using Itô differentiation rule, nonlinear damping and adaptive Backstepping procedure, the disturbance-to-state stable controller of global stabilization...
Spectrum sensing is the fundamental technology of Cognitive Radio (CR). This paper proposes a novel multiple-antenna based spectrum sensing method with random arrivals of primary users (PUs). The method first constructs a local test statistic for each antenna based on the assumption that the PU is randomly arriving, and then calculates the estimated optimum coefficient for every local test statistic...
This paper is concerned with the fusion estimation problem for multi-sensor discrete time-invariant linear systems with multiple time delays and colored measurement noise. In order to transform those systems into systems with correlated white noise, a system transformation method is introduced. A sequential covariance intersection (SCI) fusion Kalman filter is given based on the local optimal recursive...
The paper analyzes the problems existing in the practical application of traditional laser triangulation algorithm and sums up the front-end and back-end of graph-based SLAM. Taking into account of the singularity, similarity and symmetry of garbage's feature which may cause feature mismatch and the shortcomings of reflective panels being easily blocked by other objects but with high position accuracy...
Striking hostile ground targets for air force is a crucial way to achieve air superiority in modern warfare. For the maximum efficiency of limited munitions, the optimal weapon target assignment (WTA) scheme should be developed. Aimed at the fact that lots of approaches have been presented for the WTA problem of stationary targets, while less for the ones of moving targets, this paper proposes an...
Locality preserving projections (LPP) can preserve the local structure of the datasets effectively. However, it is not capable of separating the samples that are close to each other in the high-dimensional space but belong to different classes. Focusing on the problem, a class-dependent locality preserving projections (CDLPP) algorithm is proposed in this paper. The class information is embedded into...
When the airborne or missile borne radar works at the forward-looking imaging mode, the common techniques for improving azimuth resolution are invalid, because the difference between the Doppler frequencies of targets in different azimuths is very small. Meanwhile, other real beam sharpening methods only have very limited effect on azimuth resolution enhancement. For the problem of forward-looking...
In the present study, the surface meteorological parameters over Singapore are simulated using WRF-ARW mesoscale model by varying the planetary boundary layer (PBL) parameterization schemes, horizontal resolutions and two land cover data sets (USGS and MODIS). Simulations are conducted with four nested domains having horizontal resolution of 27, 9, 3 and 1 km; 51 vertical levels by using the 1° ×...
Applying high voltage electric field on an intense femtosecond laser ionized plasma channel, enhanced ionization and lifetime extension up to few microsecond of plasma channel was observed. Streamer and leader types of coronas along laser filament were generated. The technique has been used to precisely probe plasma density distribution.
We realized an all polarization maintaining (PM), Q-switched erbium-doped fiber laser based on WSe2-PVA saturable absorber (SA). At the pump power of 280 mW, the laser had a pulse width of 1.013 μs, a repetition rate near 110 kHz and a center wavelength of 1560 nm. Q-switched mode-locked operation was also observed when the pump power reached 420 mW. An all polarization maintaining hybrid mode-locked...
As a new application platform of synthetic aperture radar (SAR), the near-space hypersonic vehicle has a more serious range migration problem than the traditional airborne platform due to its curved-flight motion characteristic, and its imaging results will be further affected under the condition of high resolution demand. Since the SAR slant range of hypersonic platform is relatively complicated,...
The performance of the seeker highly influences the design of the control algorithms and the attack precision of the missile. Before the missile with seeker mounted on is launched, the performance of the seeker needs to be accurately evaluated, especially for the expensive ones. Focusing on the problem, a millimeter wave seeker evaluation method is proposed based on the differential global positioning...
Effects of high frequency repetitive transcranial magnetic stimulation (rTMS) with a subthreshold intensity on hemodynamic response in brain cortices (both motor and prefrontal cortices) was investigated using the functional near infrared spectroscopy (fNIRS) technique. FNIRS signals of the motor and prefrontal cortices were acquired in healthy volunteers (n=7) at rest and during rTMS intervention...
This paper is concerned with the fusion estimation problem for multi-sensor discrete time-invariant linear systems with multiple time delays and colored measurement noise. A fast sequential covariance intersection (SCI) fusion Kalman filter is given based on the augmented Kalman filter in the linear minimum variance sense, which avoids the calculation of the cross covariance matrices between local...
In this paper, a neurodynamic optimization approach is proposed for robust pole assignment of fractional-order control systems. Compared with integral-order systems, the pole assignment of fractional-order systems is more challenging due to variability of stability region. The robust pole assignment is formulated as a constrained optimization problem, and a robustness measure is derived as a pseudoconvex...
Chemo-immunotherapy which combines chemotherapeutics with immune-modulating agents represents an appealing approach to improving cancer therapy [1, 2]. To maximize its efficacy, differential and precise targeting of the multiple therapeutics into corresponding cells is desirable. Here we develop an immunostimulatory nanocarrier that simultaneously loads platinum (Pt)-based chemotherapeutic prodrug...
Power management on current mobile devices relies on OS modules known as DVFS governors. However, existing governors determine system configuration only based on low-level information such as CPU load without any input about application-level behaviors. In particular, there exists no communication from mobile apps to energy managers. We find that information about app usage scenarios (e.g., gaming,...
Although Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in LTE and other systems, the problem of large band leakage caused by the Doppler effect restricts the further improvement of performance when the user moves at high speed. The Filter bank based multi-carrier (FBMC) technology is one of the effective techniques which could replace OFDM in 5G communication systems...
A fiber all optical phase shifter and switch near 1550nm is realized by depositing two-dimensional nanomaterial tungsten disulfide (WS2) to tapered fiber. The device has a slope efficiency of 0.0174π/mW.
It is crucial for autonomous vehicles to navigate at intersections. The accurate location of intersections and the orientation of each branches are necessary for decision making and path planning. In this paper, a unified method is proposed to estimate orientations of each branch at an intersection and to locate the position of the intersection. First, based on vehicle dynamics, a densifying method...
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