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Planetary gearboxes, as a key component of the transmission systems, are widely used in large-scale and complex mechanical equipment such as automobiles, helicopters, wind turbines and construction machinery. Due to working under the variable load and speed conditions, they are prone to failure and fault vibration signal generally exhibits many different characteristics from a planetary gearbox under...
A new deep-sea hybrid Raman insertion probe (RiP) has been developed by the Institute of Oceanology, Chinese Academy of Sciences (IOCAS) and the Ocean University of China (OUC) for the detection of the hydrothermal vent, cold seep fluid and sediment pore water geochemistry. The novel probe can work at temperature range from 0 to 450 °C with water depth to 4500 m.
This paper investigates the detection schemes for single-carrier underwater acoustic communications over the severe time-dispersive channels. A low-density parity-check (LDPC) code is employed for the improvement of the equalization performance. A detection scheme with Turbo conception is proposed which includes a LDPC decoder in the feedback loop of an iterative block decision feedback equalizer...
With the deployment of ultra-dense HetNets, the inter-cell resource allocation requires new network solutions to handle differentiated user demands, while software defined network (SDN) has emerged as a solution to it for imbalanced user needs, as well as enabling efficient resource utilization and QoE. Under such motivations, we employ a QoE assessment model over SDN to analyze the impact factors...
In face of the rapid growth of data traffic in cellular networks, Cloud Radio Access Network (C-RAN) architecture has been proposed as a solution to obtain better performance in terms of efficiency, expansibility, elasticity, stability and expenditure such as Capital Expenditure (CAPEX) and Operational Expenditure (OPEX). However, C-RAN demands a comprehensive evaluation model and accurate qualitative...
Inter-cell interference is the main obstacle for increasing the network capacity of Long-Term Evolution Advanced (LTE-A) system. Interference Cancellation (IC) is a promising way to improve spectral efficiency. 3rd Generation Partnership Project (3GPP) raises a new research project — Network-Assisted Interference Cancellation and Suppression (NAICS) in LTE Rel-12. Advanced receivers used in NAICS...
To achieve low delay for vehicular communication in cellular networks, the use of direct device-to-device (D2D) communication among vehicles is regarded as a key functional requirement. When D2D users share the spectrum with regular cellular users (D2D underlay), resource allocation schemes assure the coexistence between D2D and cellular users. Due to the high mobility of the vehicles, the resources...
For cascaded system, interactions among individually designed power subsystems may cause the instability of the whole system. It has been shown recently that the series-virtual-impedance (SVI) control strategy can stabilize the cascaded system via shaping the load input impedance in a very small frequency to minimize its impact on the original load converter. In this paper, a further investigation...
It has been shown recently that a cascaded dc/dc converter system can be stabilized via amplitude compensation (SAC) or phase compensation (SPC) for the input impedance of the load converter. In this letter, it is shown that the cascaded system when adopting the SAC is unconditionally stable but conditionally stable when adopting the SPC, that is, SAC is more stable than SPC. Then, the comparison...
Atmospheric pressure plasma-enhanced chemical vapor deposition (AP-PECVD) was applied for the fabrication of amorphous indium gallium zinc oxide thin-film transistors (a-IGZO TFTs). In this work, a-IGZO TFTs fabricated by AP-PECVD technique were firstly treated by post deposition of in-situ Ar/H2 plasma with atmospheric pressure plasma Jet (APPJ). Compared to without plasma treatment, samples with...
There has been some adaptive algorithms used in the microphone array speech enhancement technology, but most of them had shortcomings like program back substitution, slow convergence and smaller voice. In our study, an adaptive noise reduction algorithm for microphone array is proposed based on an improved recursive least-square methodology. Using low complexity QR-RLS algorithm based on inverse Givens...
Support vector machine (SVM) plays an important part in fault diagnosis of chemical plant, and intelligent optimization algorithms are used to optimize the SVM parameters, including the penalty parameter C and parameter g of different kernel function, to improve performance of its faults classification. To assess SVM faults classification capability based on diverse optimization algorithms and various...
A method of axis orbit analysis based on LabVIEW is researched in order to recognize the fault of rotating machinery. A rotor fault diagnosis system including a fault simulation platform, a set of testing devices and a signal analysis program is developed. The signal analysis program can be used to realize some functions such as data acquisition, signal analysis, processing and display, pattern recognition...
In order to realize the leading role of machine vision in intelligent cargo handling of the robot, a fusion method of visual image edge detection based on wavelet transform and mathematical morphology is proposed. That wavelet transform is used for image edge detection exists missing detection, smoothness and weak edge problem. So an improved method needs to be studied, in which a wavelet transform...
Burst errors are often observed in the practical underwater acoustic channels because of the frequency selective fading, leading to the reliability performance degradation of the underwater acoustic communications. This paper proposes a coding channel model based on the simple Fritchman model for describing the burst error statistics of the underwater acoustic communications. The error-free run distribution,...
Photonic generation of phase-coded signals with a dual parallel construction using two phase modulators (PMs) is proposed and demonstrated. In the proposed scheme, the continuous-wave (CW) light wave emitted from a tunable laser (TL) is split into the two beams light wave with equal power via a 50 ∶ 50 optical power splitter (OPS), one beam passes the upper arm of the dual parallel construction, which...
Along with the fast development of spread spectrum communication and global positioning system, varied signal forms are proposed, especially the emergence of BOC modulated signal leads to the characteristics of multi peaks and spectrum splitting. However, consider the need for the flexibility and extensible BOC signals application, a flexible control binary offset carrier modulation signal is proposed...
In this work, we present a novel versatile fiber laser based on the scheme of bidirectional transmission, with a nonlinear optical loop mirror (NOLM) and a graphene-polyvinyl alcohol (G-PVA) as saturable absorbers (SAs), and demonstrate the generation of dispersion-managed soliton (DMS) and Q-switched pulse simultaneously or respectively for the first time to the best of our knowledge. In counter-clockwise...
Object tracking usually suffers from the geometrical deformations and occlusions of objects. This paper presents a new method for accurate object tracking by combining the multi-angle discriminative correlation filters and key-points under the framework of Discriminative Scale Space Tracker (DSST) tracker. Experimental results demonstrate that the proposed method can produce promising tracking results...
For multi-cell time-division duplex (TDD) massive multiple-input multiple-output (MIMO) systems, pilot contamination originates from limited pilot resources has been proved to be the ultimate limiting factor when the base station (BS) antennas are increased without bound. In this paper, a modified uplink signal structure is proposed to reduce the negative effects of pilot contamination. Specifically,...
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