Search

Underwater acoustic sensor networks have wide application prospects in both commercial and military fields, and can be applied to marine environment monitoring, seabed resources exploration, disaster prevention, aided navigation, distributed detection, etc. In this paper, the software defined open architecture of acoustic modem, adaptive adjustment of multi-mode communication, and clustering protocol are given. The effectiveness of these methods is verified by an underwater acoustic communication network field trial.

In this paper, Semantic Differential Method was introduced into design segmentation research based on the theory of market segmentation and Kansei engineering, so as to quantitatively study on the measurement of aesthetic differentiation among consumer groups, and discuss related strategies of product design. Through empirical research, the corresponding relationship between consumer groups and Kansei semantics of products was established; the feasibility of guiding design segmentation by assessing the Kansei images of product was examined. Therefore, this paper provides some valuable suggestions for the design management and creative design.

As a nascent method of multi-criteria decision-making with uncertainty, DS/AHP is similar to the analytic hierarchy process (AHP) in structure and its analytic processes are based on Dempster-Shafer (DS) theory. However, it is unsuitable to deal with the multi-attribute decision making with incomplete information, especially the attributes with missing values. In this paper, a new method for multiple-attribute decision making based on ER-AHP has been proposed, which incorporates the Evidential Reasoning(ER) algorithm with AHP. Firstly, each alternative is compared with the negative ideal alternative under an attribute to form the decision table by experts. Then a new basic probability assignment function (BPA) is constructed to express the incomplete information and some properties of the function are proved. After then, based on the results of aggregation which combines the attributes of each alternative by the ER algorithm, the alternatives are sorted and selected. Finally, the ER-AHP is compared with the DS / AHP through a numerical example.

Because of the hostile ocean transmission condition, underwater acoustic communication technology is one of the most difficulty communication technology. Frequency-Hopping underwater acoustic communication system is drawing more and more attention for its good performance under serious noise and multi-path interference condition. Synchronization signal processing is a key factor of FH underwater acoustic communication system. In the research of FH shallow underwater acoustic data communication system, a synchronization method employing adaptive line-spectrum enhancing (ALE) method, frequency diversity, pulse width judgment and frame synchronization signal correlation processing to detect synchronization signal under the condition of low SNR and heavy amplitude fluctuation is presented. The sea experiment results are satisfactory.