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Multiple sources of remote sensing data have an increasingly wide use as an effective and comprehensive approach in many remote sensing applications, such as the estimation of impervious surface. Impervious surface is an important indicator of most urban-related environment, such as non-point source pollution, urban heat island and urban climate. However, accurate mapping of urban impervious surfaces...
In this article, a newsegmentation method based on traditional region growing (RG) is proposed for high resolutionremote sensing imagery. This method takes regional minima from horizontal and vertical gradient maps of the image as seeds for the following region growing processing. The new method consists of several steps as follows: (1)deriving a morphological gradient map from the input multispectral...
This study is to propose a multidimensional scaling localization algorithm based on cluster structure [MDS-MAP (C, E)], and used in underwater wireless sensor networks (UWSN) node self-positioning. MDS-MAP (C, E) algorithm: First, underwater wireless sensor network is divided into more than one cluster head of the local network; Secondly, local positioning, using the Euclidean algorithm to calculate...
In the marine environment, the underwater images would have low SNR and the detail is fuzzy due to scattering and absorption of a variety of suspended matter in sea water and the water itself. For the three types of characteristic marine targets, the novel moments called Pseudo-Zernike boundary moments are proposed. By expanding the scope of the calculation to any rectangle and the use of fast algorithm...
In the marine environment, the underwater images have low SNR and the detail is fuzzy due to scattering and absorption of a variety of suspended matter in it and the water itself. If traditional methods are used to dispose underwater images directly, it is unlikely to obtain satisfactory results. Through the further research on traditional fuzzy c-means clustering algorithm, an adaptive FCM segmentation...
Wavelet packet transform is an efficient method in speech denoising processing. In this paper, we research on various wavelet packet basis, decomposition layers, values of the threshold and threshold functions which are key parameters in wavelet packet denoising. Furthermore, we adopt three methods to evaluate the effects of denoised speech, including signal-noise-ratio(SNR), wavelet spectrum distortion...
With sewage plant aeration tank activated sludge as mixed bacteria source, Nitrobenzene concentration gradient of the chlorine used to increase the aerobic bacterial degradation of oscillating bottle method of domestication and enrichment culture. Separation and purification out of one can right-chloronitrobenzene as the sole carbon, nitrogen and energy of bacteria. Through physiological and biochemical...
In this paper, the domestication of the activated sludge by which nitrobenzene can be degraded in a relatively poor nutrition is studied. The ability of activated sludge degradation of nitrobenzene is studied by degradation kinetics. The toxicology validation about the effect of activated sludge degradation of nitrobenzene is preliminarily explored. The results show that: The nitrobenzene could be...
The water quality computer simulation is an important method to study the water flow field and the change of water quality in lake. In this paper, combining two-dimensional shallow water dynamics-water quality model with FLUENT software to simulate the water quality of Daming Lake in Jinan. The results can reflect effectively the changes of water flow and water quality of Daming Lake in actual situation,...
In this paper, an improved adaptive update and adaptive prediction algorithm is put forward. The method makes full use of the correlation of neighboring pixels, which the approximation band and the detail bands obtained by a polyphase decomposition of an original image perform the proposed adaptive update step one by one, then the detail bands perform the adaptive prediction algorithm. The advantage...
Sea noise is a non-stationary random series. The acoustic channel noise of shallow sea has the features of remarkable nonlinear and non-Gaussian characteristics of pulse. We use wavelet packets to analyse this kind of noisy signal, and study on different wavelet basis, threshold functions and values of the threshold which will influence the extraction of a LFM signal under the background of strong...
It is tough to achieve higher transmit speed and lower bit error rate(BER) because of the complexity of the underwater acoustic channel. This paper proposes a method of orthogonal frequency division multiplexing (OFDM) modulation technique for improving the situation. It can reduce BER with the ability of resisting multi-path interference and can increase communication rate with the characteristic...
On the basis of combing matter-element extension method with index reflecting flood damage intensity and the degree-level analysis method, a new the comprehensive quantitative evaluation model is established for flood damage intensity. Use this model to make comprehensive quantitative evaluation of the flood in Shandong province. The result shows that not only the flood quantitative level and accuracy...
The traditional control way of reservoir results in a large number of ??abandoned water?? during annual flood season, and it is possible that there is not always enough water for reservoir storing to maximal beneficial cubage after flood season. Responding to this case, this paper established the minimum abandoned water optimization model of reservoir based on risk analysis. There are two characters...
This paper proposes a basic MC-CMDA. via carrier interferometry Codes (CI codes) in an Underwater Acoustic(UWA) Channel. Compared with OFDM in UWAC, it can allow a number of users simultaneously and asynchronously accessing the UWA channel. A trade off relation exists between diversity gain and user capacity as well as between spread spectrum gain and system efficiency. Then diversity combining scheme...
According to the feature of underwater acoustic channel (UWA), the implementation of time and frequency synchronization is introduced. In the sea area, the experiment result show that the synchronization method of OFDM system has the better performance.
The south moat in Jinan has a certain degree of natural spring water supply. But the spring filling water changes according to the level of ground water level, and compared with the ecology environment water demand of the south moat, spring filling water alone can not meet the need throughout the year. At first, this paper established the relationship between spring water inflow and ground water level...
Considering the features of Underwater Acoustic channel and the sensitivity versus synchronization for CI/OFDM system, A time and frequency synchronization method based on Constant Amplitude Zero Auto-Correlation(CAZAC) sequence is presented. The time offset estimation and carrier frequency offset estimation can be achieved simultaneously. The fractional part and integral part of carrier offset estimation...
In this paper, multiple access technique for the physical layer of underwater acoustic (UWA) networks is discussed. Considering the characteristics of acoustical channel and UWA networks, multi-carrier code division multiple access(MC-CDMA) method is chosen as the multiple access strategy in the design of an UWA network. On this basis, a MC-CDMA multiple access scheme is proposed. The preliminary...
H.264/AVC is the newest video standard to resolve the efficient transmission of video data. Compared to previous generations, it delivers better quality at lower bit rates. However, its computational complexity increases almost exponentially, which is still a problem and has motivated much research into H.264 real-time codec both in industry and academia. H.264 baseline real-time video decoder implementation...
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