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An effective sensitivity-improving scheme combining symbol-amplitude scaling and peak-amplitude reduction is proposed for IM-DD OFDM-PONs. Sensitivity improvements of 3.8 dB and 4 dB are observed in two ONUs with 40-km and 80-km transmission distances, respectively.
In this paper, a novel model reference adaptive (MRA) based speed and rotor position estimation strategy is proposed for the surface mounted permanent magnet synchronous motor (SPMSM). In the proposed strategy, a new adaptive law is proposed by considering the MRA adaptive law as a controller. Furthermore a parameter self-turning strategy and a speed compensation strategy are proposed to improve the...
In modern time, finger-vein recognition technology has become increasingly popular. Basically, the finger-vein recognition process involves finger-vein image acquisition, feature extraction and recognition. The recognition algorithm is the key research issue. Because of the differences between acquisition devices and individuals, the performance of the algorithm is affected by image rotation, translation...
We have previously proposed a novel parameter identification method for the Li-ion battery equivalent circuit model (ECM) considering the electrochemical properties, with which a second order ECM resistances/capacitances values can be obtained from electrochemical parameters. In this paper, we apply this physics-based ECM with Kalman filter for cell SOC estimation. To implement the Kalman filter to...
In a multi-energy microgrid system, meteorology factors can not only affect output of renewable resources, but also affect cooling and heating demand. Considering relationship of meteorology factors (solar insolation, wind speed, outdoor temperature) and cooling, heating, electricity demand of users in a multi-energy microgrid system, this paper proposes a model which can describe relationship between...
This Paper carried out three phase and single phase short circuit tests and verified the security and stability of large scale wind farms integration on Rongcheng power station. Including location and type of short circuit, system operation conditions and measurement of date, summarized the main work between the wind farms short circuit test. Following the ideas of “unit level-wire level-wind farm...
The inverse kinematics solution of the Six-DOF Serial Robots is a highly complex nonlinear problem, and the existence of the solution is not unique, therefore, the inverse kinematics method has attracted extensive attention. In this paper, BP neural network is applied to the inverse kinematics of Six-DOF Serial Robots, and the process of inverse solution is transformed into training of network weights...
Temperature distribution and its time evolution are fundamental physics of arcs occurring during breaking process in electro-mechanic devices, which largely determine contact erosion. Aimed to the highly fluctuating switching arc, we implemented an optical system based on relatively strength of two individual spectrum emitted by the same excited atoms inside the plasma. Light emitted from arc is firstly...
Aimed at the high requirements of real-time in barrage video system, a barrage distribution strategy based on the earliest deadline first algorithm is proposed in this paper, which distributes all the barrages in the system to balance the best of the barrage completion rate and the completion rate of important barrages. The system will assign dynamic priority level to each new arrival barrage, and...
On account of the strong time series feature of smart grid load data, this paper presents a data cleaning method based on similarity measurement of time series, which detects the abnormal data of load data and fills the vacancy value. In this paper, an up-and-coming symbolic method symbolic aggregate approximation(SAX) is applied to the similarity study of 96-point load data. The Euclidean distance...
In recent years, the spectral regions optimization of near infrared spectroscopy using the intelligent computing algorithms has achieved good application results. According to the spectrum optimization problem of near infrared spectroscopy, the near infrared spectral regions of tobacco samples are optimized using genetic algorithm in this stduy. Simultaneously, the genetic algorithm is combined with...
Using the low earth orbit (LEO) satellite technology to provide high capacity and high speed data service for the users, has been one of the most popular research hotspots in LEO satellite communication system. Whereas, the traditional researches in the field of satellite communication mainly focus on the optimization of channel resource allocation, which is based on the improvement of data transmission...
WiFi Fingerprint Positioning (WFP) in outdoor scenario needs mass location information including WiFi signal map and GPS (Global Positioning System) information. Generally pre-measured solution can provide high quality data but it needs lots of labor and time. Different from pre-measured solution, crowdsourcing is an economic and efficient way to obtain location information. WFP based on Clustering...
Lateral line is a unique organ, with which fish could sense surrounding environment by processing hydrodynamic information about local flow. This sensing mechanism provides a new perspective for researchers and engineers to build such a sensing system that could be applied to control and near field navigation for underwater robots and vehicles. In this paper, a pressure-sensing-based and fish-shaped...
In order to analyze the growing trend of the posterior fossa tumor in children and provide assistant basis for the treatment or surgery of tumors, a variety of texture analysis methods were comprehensive used to analyze and identify three kinds of brain tissues, tumor region, tumor diffusion region and normal brain tissue region. The MRIs of tumor patients were collected to extract texture features...
A curve fitting method based on automatically extracting subsection points is proposed to fit the wheel tread profile accurately. Firstly, the subsection points are determined by segmenting discrete points of wheel tread profile based on given errors and threshold. Secondly, the segmentation interval is determined with the respective segment point as the center, and the least squares curve fitting...
Using ITU-R P.1546 model for propagation loss prediction of airborne ultrashort wave communication. On this basis, we give the calculation formula of signal to interference ratio of the ultrashort wave communication receiver when the enemy using Gaussian white noise for repressive interference. We also give the calculation method of the bit error rate of the digital communication system when it's...
Small and high-precision piezoresistive pressure sensor based on graphene/hexagonal boron nitride (h-BN) heterostructures can be embedded in aircraft airborne equipment, allowing for potential application involving fault diagnosis, prognostics and health management. In this paper, the pressure-sensing characteristics of graphene/h-BN heterostructures membrane — the relationship between pressure and...
We experimentally demonstrate a compact silicon contradirectional coupler with high sidelobe suppression by using apodized subwavelength grating waveguide. A suppression ratio of higher than 20 dB is achieved with a ∼100-pm coupling length.
The door system is the key systems for the safety of urban rail vehicles. In the urban rail vehicle system, the failure of the door system accounts for more than 30% of the total failure of the vehicle system, in order to overcome the subjectivity of the traditional reliability-based door maintenance (RCM) method, a new method of maintenance decision for RCM based on Proportional Hazard Model (PHM)...
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