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Vegetation fraction is an important index for sandy land evaluation, but it changes with time and precipitation obviously, especially the annual ephemeral plants. How to choose the best time for vegetation coverage to evaluate the sandy land degree is an imperative question. In this paper, soil adjusted vegetation index (SAVI), pixel dichotomy model and pixel unmixed model for multi-endmumber were...
Desertification and restoration could be assessed by long time-series vegetation index at regional scale. In this study, a new approach for desertification assessment based on analysis of NPP and MNPP change derived from the time-series MERIS NDVI data was promoted. Desertification and restoration in Xilin Gol League, Inner Mongolia, China were assessed and monitored during 2003 to 2011 by using the...
Assessment of land condition is a basic prerequisite for finding the degradation of a territory under climatic and human pressures leading to desertification. The temporal change in vegetation productivity is a key indicator of land degradation. In this paper, taking the Beijing-Tianjin dust and sandstorm source region (BTDSSR) as a case, the annual-maximum normalized difference vegetation index (NDVI_max)...
P2P network has become an important branch of Internet recently, with the significant advantages of full resource utilization, dynamics, openness and high scalable, which helps it achieve wide applications. But security and trust have also become urgent problems for a P2P network due to its openness and anonymousness. Most of the current schemes rely on some trust models, but the research in systematic...
In order to improve the supplier selection and matching supply with demand for third party logistics integrated platform, this paper proposes a three-layer evaluation index system for supply and demand matching considering factors of service areas and cooperation experiences, establishes a supply and demand matching model based on neural network. This model perfectly simulates the process of fuzzy...
Secure route selection is always a challenge for distributed networks. The paper takes trust value as one of routing metrics for distributed networks to defense some attacks. The paper provides an algorithm to compute trust value and then gives a routing algorithm based on trust value. Trust value's computation takes remembering factor and credibility as main parameters. The final route is secure...
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