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The important step towards Web service implement is the discovery of required services. Traditional Web service uses UDDI, WSDL standards etc. Keywords based searching is used in the traditional service discovery. For needing manual intervention and lack of semantic description, the methods before have low precision rate. Semantic Web service problem can be(More)
In this paper, a novel method for rain rate estimation is researched by polarimetric phase shift of the Global Navigation Satellite System (GNSS). The physical process of GNSS signals propagating through rain-filled medium is investigated, by which the cause of polarimetric phase shift is explored. Then, a theoretical model between polarimetric phase shift(More)
In this work, the feasibility of estimating rain rate based on polarimetric Global Navigation Satellite Systems (GNSS) signals is explored in theory. After analyzing the cause of polarimetric signals, three physical-mathematical relation models between co-polar phase shift (K HH , K VV), specific differential phase shift (K DP), and rain rate (R) are(More)
MODIS data is increasingly important for oceanographic, terrestrial, and atmospheric science observation. Because of the high data rate, the loss less data compression becomes vital for MODIS data transmission and storage. In this paper we present a new approach for loss less compression of MODIS data based on the maximum spanning tree and 3D context(More)
The MODIS data is increasingly important for oceanographic, terrestrial, and atmospheric science observation. The lossless data compression therefore becomes vital for its data transmission and storage as a result of the high data rate. In this paper we present a new approach for lossless compression of MODIS data. First we determine the prediction sequence(More)
Service discovery is a key concept in a distributed Grid environment. The first step towards Grid implement is the discovery of services. In this paper, we build a new Grid service matching graph based on the semantic similarity of function parameters and then an efficient search algorithm is presented to accomplish Grid service discovery. The experiment(More)
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