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In view of the shortcoming that the traditional video monitoring device is inconvenient to move, in this paper, we take the tracked intelligent vehicle as the research object and design a mobile video monitoring system based on Android. The system collects the video information of the environment around the intelligent vehicle through the camera and then transmits the video information to the Android...
Knowledge of the sediment layer number is critical for accurate geoacoustic inversion and sound propagation modeling. A hybrid image processing approach is introduced in this paper to extract the number of sediment layers from subbottom profiling files. A statistical equalization method, a multiscale line filter and a wavelet decomposition are used to detect and extract the horizontal lines present...
Explosive charges are widely used in underwater acoustics experiments because it has wide bandwidth and high source level. the received signals are the shock wave and followed by a series of bubble pulses, which seriously affect the observation and applications of the signal. But for the shallow water waveguides, the bubble pulses could be seen as anther “signal”. In this paper, we treat the first...
This paper characterizes sediment geoacoustic properties using single beam sonar echoes collected from a sea trial conducted in 2010. The characteristic parameters of a sediment, e.g., mean grain size are estimated by matching the envelops of collected echoes and predicted replicas by a high-frequency backscattered model. The envelopes of real data were first averaged over a certain number of pins...
With the extensive application of machine learning algorithms in bioinformatics, more and more computer researchers are beginning to focus on this field. Polyadenylation of messenger RNA (mRNA) is one of the key steps of gene expression in eukaryotes, polyadenylation site marks the end of transcription, it is of great significance to explore prediction of the site of gene sequences encoding gene....
Hadoop distributed file system (HDFS) is an open source framework that has been usually used for cloud storage systems. Due to the arts and craft development and the consideration of price, today's storage system usually contains both fast devices (such as SSDs) and slow devices (like Hard disks). In order to optimize the performance, we should store the frequently accessed data in fast devices, and...
Design a scientific and reasonable Car styling is the first task of car development. These should be in accordance with the public appreciation of the beauty. The SUV car styling evaluation research is based on the user's demands, using Kansei Engineering research method, contrast with sensual word index, The results of the SUV model evaluation index weight of various indicators calculated by minimum...
Voltage dip has become the most user complaint problems about power quality, in order to ease voltage dip to guide the operation, planning and transformation of power grid. In this paper, based on the voltage dip caused by four kinds of busbar fault, the voltage dip matrix of each type fault is established, the grid structure evaluation indexes based on voltage dip is proposed. Based on the column...
In Bayesian inversion schemes, geoacoustic parameter values and associated uncertainties normally are obtained through sampling approaches, e.g., Metropolis-Hastings (M-H) sampling. This paper presents an attempt to solve this problem through applying a particle filter (PF) to solitary data input as collected in the Yellow Sea, China, 2002. In the experiment, a 38-g explosive charge was used as a...
This paper presents characteristics study of internal wave in the Yellow Sea by analyzing nearly 40 h thermistor data obtained in 2007 experiment. Vertical displacements of isopycnel surfaces are derived from thermistor chain data, and its power spectrum is analyzed to qualitatively interpret the high-frequency characteristics of internal wave. The internal wave spectra of low modes are estimated...
Due to the light attenuation caused by absorption and scattering of sea water, the performance of underwater optical communication system is limited. Usually, the optical signals will be decayed severely in hundreds of meters and the waveforms are submerged in noise. To improve the signal-to-noise ratio (SNR), for traditional methods, most of the noise can be suppressed by filters based on classic...
According to annual list of the top 250/225 international contractors published by Engineering News-Record(ENR) from 2007 to 2016, the paper filters thousands of data related to power engineering contract. On this basis, the business scale, growth rate and changing trend of international power engineering contract market are first analyzed. Then, with the introduction of a series of indicators, such...
Based on the advantages of data smoothing, this paper presents a new collaborative filtering algorithm to solve the problem of data sparsity in recommender system. The key innovation of the algorithm consists of clustering and data smoothing. Clustering is used to find out the similarity between users. This paper adopts a new method to cluster users. Data smoothing is designed to solve the problem...
Investment risk of highway construction is contained in the whole life cycle from project initiation and design, to construction, to operation and maintenance; therefore investment risk assessment and corresponding precautionary measures are very important to project success. On the basis of China's realities and by Delphi Method this article established an evaluation index system of highway construction...
Currently, the studies on Human View (HV) are developed focusing on human components of a system by capturing the human capabilities, tasks, roles, constrains, career progression, interactions and metrics. Nevertheless, there is a lack of unified definition, description and modeling method of the HV. This paper demonstrates HV as an additional viewpoint to strive to understand what HV is and how the...
The regular striations exhibited in broadband noise spectrogram due to a moving ship have been exploited for inverse problems in underwater acoustics, e.g., sediment geoacoustic characterization and source ranging. The enhancement of the underlying interference structure for striation extraction has been a hot topic for relative applications. In this paper, a straightforward method based on the low-frequency...
This paper presents our preliminary geoacoustic inversion results of the ship noise data collected by a vector sensor in 2008, Dalian, China. For the at-sea measurement, a fishing boat was served as a passive source passed by the receiver boat deploying a vector sensor, which collected the pressure field and particle velocity components at three orthogonal directions of X, Y and Z. A batch inversion...
For static gestures image classification problems, this paper proposed a kind of image recognition method based on the unsupervised feature learning, mainly using the sparse auto-encoding neural network model to extract image edge feature which is belong to unsupervised feature learning, then let the edge feature as the input of the classifier, finally sort and identify the gesture image which having...
This paper proposes a piezoelectric frequency-up-conversion (FUC) energy harvesting system induced non-contact magnetic force. The FUC system is composed of a lower frequency piezoelectric cantilever (LFPC) of 40Hz and a higher frequency piezoelectric cantilever (HFPC) of 85Hz. Both the LFPC and HFPC contain a magnetic proof mass at the end of the piezoelectric cantilevers. The experiment shows that...
On the basis of distribution network operation efficiency evaluation model, big data mining analysis of distribution network operation efficiency is carried out by using the obtained file and operation data of millions of the distribution network main equipment in 2014. The equipment include high voltage transmission line, main transformer, medium voltage distribution line and distribution transformer...
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