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Image classification is one of the critical tasks in hyperspectral remote sensing. In recent years, significant improvement have been achieved by various classification methods. However, mixed spectral responses from different ground materials still create confusions in complex scenes. In this regard, unmixing approaches are being successfully carried out to decompose mixed pixels into a collection...
Boundary detection in hyperspectral image (HSI) is a challenging task due to high data dimensionality and the that is distributed over the spectral bands. For this reason, there is a dearth of research on boundary detection in HSI. In this paper, we propose a spectral-spatial feature based statistical co-occurrence method for this task. We adopt probability density function (PDF) to estimate the co-occurrence...
This paper proposes a new pylon detection technique from point cloud data. Two masks are created from the non-ground points that mainly represent trees and power line components. The first mask is the power line mask Mₘ, which contains the power line components and trees and where successive pylons are found connected with wires. The second mask is the pylon mask Mₚ, where successive pylons are found...
In order to make the electromechanical actuator have the ability to adapt to the irregular installation space of high speed aircraft and the great dynamic characteristics, an adjustable actuator based on slider-crank structure was proposed and its transmission characteristics were studied. Firstly, the uniform nonlinear transmission ratio model is obtained respectively by applying speed synthesis...
Razor is a milestone in the field of Error Detection&Correction strategies for low-power operation. Despite the impressive level of maturity, its application on circuits other than pipelined processors still remains an open issue. Firstly, the error detection mechanism relies on special flip-flops (FFs), the Razor-FFs, whose use imposes heavy hold-time fixing and large circuit area/power overheads;...
Hybrid feedback control systems are constructed after replacing the continuous controllers with neural-network controllers (in term of neural algorithms). Here, the continuous controllers are originally designed by using the control theory in the linear time-invariant (LTI) continuous-time setting, while the neural algorithms approximate the input/output behavior of the continuous controllers through...
Corresponding to low targeting accuracy due to tissue deformation during the process of electrode insertion in sub-thalamic nucleus deep brain stimulation (DBS), biomechanical properties of brain tissue are essential to investigate. Elastic and viscoelastic biomechanical properties in post-puncture are investigated by indentation-relaxation experiment. In this paper the flat indenter with a diameter...
In this paper, two types of dual-mode dielectric resonators (DRs) are utilized to design miniaturized differential bandpass filters (BPFs). According to the boundary conditions of the electromagnetic fields, inserting a metal plate on the electric field's symmetry plane doesn't disturb the original field distributions. Thus, the structure of each employed DR is introduced by cutting off along the...
In this work, a typical two-dimensional (2D) material WS2 on a dielectric substrate is measured by terahertz time-domain spectroscopy (THz-TDS) and analyzed using the Drude conductivity model. The transmittance and sheet conductivity of monolayer WS2 have been obtained. This technology can be used to measure the thin film 2D materials in THz frequency regions.
In this work, terahertz time-domain spectroscopy was employed to establish the fingerprints of Radix Angelicae Dahuricae (RAD). Principal component analysis (PCA) and k-subspace clustering were employed to study the similarities and dissimilarities among the 120 RAD samples. The methods can be successfully used to classify these samples according to their regions. The results show that the referred...
The terahertz absorption spectra of BSA (Bovine Serum Albumin) in aqueous solution were measured under different pH values from 2.2 to 8. The absorption spectra were analyzed using the two-dimensional correlation spectroscopy (2DCOS). By comparing the cross peaks corresponding to the different pH values, it can be obtained that the conformation is related to the pH condition.
According to our previous experiment, oil flow electrification is closely related to the space charge behaviors in oil-paper insulation system under DC voltage. In this paper, we present a new numerical method to estimate the streaming current in a rectangular paper duct under DC voltage. For the simulation model, we consider the case of laminar flow in a sample of two layers of oil-impregnated-paper...
In this work, the terahertz (THz) absorption spectra of a typical protein BSA (Bovine Serum Albumin) in aqueous solution were measured under different pH conditions. The temporal changes in the absorption spectra were analyzed using the two-dimensional correlation spectroscopy (2DCOS). By comparing the cross peaks corresponding to the different pH values, it can be obtained that the conformation is...
In this work, 120 herbal medicine samples of Radix Angelicae Dahuricae (Baizhi) before and after the sulfur fumigation process were measured by terahertz time-domain spectroscopy and analyzed by support vector machine technology. The results show that the advanced algorithm used in this paper can get a classification accuracy rate of 100%. This technology can be used to qualitatively identify the...
In this work, a typical two-dimensional (2D) material MoS2 on a dielectric substrate is measured by terahertz time-domain spectroscopy (THz-TDS) and analyzed using the Drude model. The transmittance and sheet conductivity of monolayer MoS2 have been obtained. This technology can be used to measure the thin film 2D materials in THz frequency regions.
The through silicon via (TSV) technology provides a promising way to realize RF micro system. In this paper, a coaxial vertical TSV transition is presented with one TSV in center as signal conductor and six TSVs arranged in circle as ground path. The front-to-front test structure consists of two coaxial TSV transitions connected in a cascade way. As a result, the properties of the TSV transition is...
Anomaly detection based on telemetry data can improve the operating safety for spacecrafts. Most of the anomaly detection methods in this domain are based on Euclidean distance for similarity measure of monitoring parameters. However, the Euclidean distance has many limitations on telemetry data similarity measure and may affect the detecting performance. Therefore, improved distance measures and...
Recently, the advanced coastline inflection point method (CIPSD) was developed to retrieve the instrument boresight pointing error of Suomi National Polar-orbiting Partnership (SNPP) Advanced Technology Microwave Sounder (ATMS). Because of the use of mathematical model and separate-domain technique, this algorithm can retrieve the boresight pointing error in terms of Euler angles efficiently. But...
This paper mainly focused on the Drag free control system design based on the relative motion description. In this paper, the state space description model of the dynamics of the drag free satellite was established. Based on the analysis of controllability and observability, the state feedback control law was designed. Finally, considering the micro thruster configuration and output characteristics,...
The physical simulation of space interception with two high-speed spacecrafts is often executed on an area-limited marble platform, which could not imitate the high relative speed between two spacecrafts under the accuracy requirement of positions and movements. This paper presents the nonlinear similarity theory which is described under the architecture of the nonlinear geometrical and time-variant...
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