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Fault diagnosis of the wind power system is a common problem in the routine maintenance of the wind farm. However, most researches and practical applications focus on separate components, which do not take correlations of different components into consideration. This paper presents a novel two-layer Probabilistic Signed Directed Graph (PSDG) method for the fault diagnosis of the overall wind power...
With the rapid development of the Beidou system, it is important to research the acquisition of B1I signal. In order to acquire the MEO/IGSO satellites signal modulated with 1 kbps NH code in interference environment effectively and quickly, a signal acquisition scheme which is the combination of an improved half bits differential acquisition method and 3-points conic fitting method to get fine frequency...
This paper discusses the fractal feature of pore structure based on the capillary pressure data of mercury withdrawal and mercury injection. Also, the paper calculates the fractal dimension of pore structure of He8 zone in Sulige gas field. The study results show that fractal feature of mercury injection capillary pressure curve has a property of two-stage with an obvious bend, which shows the double-porosity...
The distributed system's scale increases gradually so that traditional survivability evolution methods based on mathematical model can't be applied. Firstly, Quality of Service (QoS) being the manifestation of system viability is analyzed in this paper. Secondly, a calculation method for the correlations between Qos is presented, and then a quantifiable evolution method for key attributes and distributed...
Many of the recent algorithms have been developed to improve the various aspects of collaborative filtering recommender systems, however, most of them do not take the sectional data of users and items information or characteristic into account. This paper, we present a new improved collaborative filtering based on item similarity modified and item common ratings which take full advantage of the sectional...
College Quality Course could effectively development and integrate educational resources. At present, there are different degrees of quality problems in the management of College Quality Course in our country. This article applies the Quality Function Deployment (QFD)to the management of College Quality Course. Based on analyzing the situation of College Quality Course, it clarifies the object of...
Based on the requirements of LTE-Advanced standardization, this paper provides an 8-Tx diversity scheme for LTE-Advanced downlink. The proposed scheme considers the complexity, compatibility, performance and etc. together. What's more, this paper gives the simulation results of the proposed scheme and shows the feasibility of the scheme.
In order to overcome the defects of traditional-method filtering which based on keywords, the OWL text filtering is presented in the semantic Web environment, which makes information filtering, has been raised to the level of semantics. Through distinguishing the information between the title and text, and then calculating the semantic similarity of semantic, using the integrated filtering methods,...
To investigate the blind symbol rate estimation of any linear base-band digital modulation scheme with square root raised cosine filter, an algorithm based on cyclic correlation and Haar wavelet transform estimator is proposed. First we use FFT to estimate the bandwidth roughly. Then we set the sampling frequency and range scale of wavelet transform according to bandwidth. Using the signals filtered...
In the study of location partial discharge in transformer based on the UHF method, in order to accurately locate partial discharge source, precisely achieving time delay of different signals which are received by different UHF sensors and radiated from the same partial discharge source is essential. Three methods of time delay estimation are introduced and compared, including the initial peak, the...
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