The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper the mathematical model of six-phase induction motor is established. Then the phase-fault SVPWM algorithm is put forward, and the simulation model is built in MATLAB to verify the feasibility of the algorithm. The system simulation and experiment of phase-fault of the six-phase induction machine are performed.
The near-field analytical solutions for light scattering by metal nanospheroids are presented by solving Maxwell's equations in spheroidal coordinate using the separation of variables method (SVM). Based on the vector spheroidal wave functions (VSWFs), the expressions for the internal and the scattered fields are derived analytically. Then the effectiveness and correctness of the method are verified...
With the development of computer control technology and power electronics, six-phase induction motor control system has been widely used in industrial area due to its advantages. Through the study of single-phase induction motor SVPWM control technology, combined with the six-phase induction motor winding structure, a novel six-phase induction motor SVPWM control strategy is proposed and the third...
This paper reviews the first challenge on single image super-resolution (restoration of rich details in an low resolution image) with focus on proposed solutions and results. A new DIVerse 2K resolution image dataset (DIV2K) was employed. The challenge had 6 competitions divided into 2 tracks with 3 magnification factors each. Track 1 employed the standard bicubic downscaling setup, while Track 2...
The increasing pervasiveness of object tracking technologies leads to huge volumes of spatio-temporal data collected in the form of trajectory streams. The discovery of useful group patterns from moving objects' movement behaviors in trajectory streams is critical for real time applications ranging from transportation management to military surveillance. In this work we propose a novel type of group...
In order to better balance exploration and exploitation and solve the problem of sparse reward in reinforcement learning, this paper focus on changing the traditional exploration strategy, such as ε-greedy strategy, by introducing the count for state-action visitation into the Boltzmann distribution method as a new behavioral exploration strategy, and adding count-based exploration bonus to guide...
As datasets increase radically in size, highly scalable algorithms leveraging modern distributed infrastructures need to be developed for detecting outliers in massive datasets. In this work, we present the first distributed distance-based outlier detection approach using the MapReduce-based infrastructure, called DOD. DOD features a single-pass execution framework that minimizes communication overhead...
IEEE 802.11 protocol uses random frequency channel assignment which can severely degrade the network throughput. This paper presents a novel efficient throughput oriented frequency channel assignment mechanism with low complexity for the infra-structured IEEE 802.11 based WiFi networks. The core idea of this assignment mechanism is to choose the frequency channel that is just good enough to maximize...
This paper proposes a new framework that performs spectrum sensing in soft decision based distributed detection systems while considering correlated sensors' readings. The main contribution is formulating the problem into a nonlinear integer programming problem for which the genetic algorithm is further applied to find a suboptimal solution. This framework is able to handle both soft and hard decisions...
While gaining increasing popularity, fountain codes, including Luby transform (LT) codes and their extension called Raptor codes, are known to perform poorly over noisy channels. In this paper, we present a method which gives new output degree distributions that can significantly improve the decoding performance of these codes in binary input- additive white Gaussian noise (BI-AWGN) channels. First,...
Designing a reliable and generic perceptual quality metric is a challenging issue in three-dimensional (3D) visual signal processing. Due to the limited knowledge on 3D perceptual, it is difficult to fuse the visual information of left and right views in an effective way. In this paper, we propose a complex singular value decomposition (CSVD) based stereoscopic image quality assessment (SIQA) metric...
Vector control needs motor speed as feedback information in a real time. Encoders are used for speed identification usually, but some severe industrial situations limit the usage of encoders. As a result, scientists begin to find speed identification methods. After scrutinizing the advantages and disadvantages of the main motor control system and motor speed identification methods, we make up the...
With the development of the Internet, a lot of people trapped in the network, especially the adolescent depending on the network game and disturbing their normal life. 579 freshmen participated in this work who were collected the personality questionnaires in the first week they came in university and their grades points average (GPA) after half year. The questionnaires were including Self-Control...
Low voltage ride through (LVRT) ability is the most important indicators of photovoltaic (PV) power generation unit grid-connected performance. At present, most of the important standards in the world require that PV power unit must have LVRT ability, and part of the standards demand that PV power generation unit should have reactive power support capacity as well, in order to maintain grid voltage...
This paper introduces an image registration method for surgical robots. Force/torque transducer is fixed onto the robot and the surficial feature of the intraoperative operating space could be obtained with human-robot cooperation way. The ICP registration algorithm is used to calculate the transform matrix between the intraoperative operating space and the preoperative planned space. Experiments...
Decoding of Raptor codes consists of decoding of both the LT part and the precode part of the codes. When LT decoding is performed, a scenario may arise where the message passing-based decoding process is unable to provide non-zero log-likelihood ratio (LLR) updates to a fraction of input symbols even if it is mathematically possible to do so. The problem is even more critical for codes with short...
Luby transform (LT) codes are defined by degree distribution functions of encoded symbols. In erasure channels, good degree distribution functions should prevent the ripple of degree-one symbols from vanishing until the successful termination of decoding process. In this paper, we show that for binary input additive white Gaussian noise (BIAWGN) channels, performance of LT codes also depends on the...
User model is the key of recommendation algorithm, in order to solve the great sparsity of user-item rating model, proposed a collaborative filtering recommendation algorithm based on weighted item category. The algorithm evaluates the rated items by category, and with weighted scores summation, which changed the user-item high-dimensional rating data into user-category low-dimensional statistical...
The 3GPP Long-Term-Evolution system applies pure packet-switch architecture. Meanwhile, the LTE radio access has a short Transmission Time Interval (TTI) of 1ms in order to reduce end-to-end delays. Such burst transmission cause major difficulty in voice transmission over LTE (VoLTE), especially for uplink transmission at the cell edge. TTI bundling has been proposed to enhance the coverage of VoLTE...
In decentralized cooperative sensing for cognitive radio, a few secondary users (SUs) sense the spectrum, process individual observation and then pass quantized data to the fusion center (FC), where the decision on signal present hypothesis or signal absent hypothesis is made. When the reporting channels between SUs and the FC are bandlimited and error prone, a quantization scheme was proposed recently...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.