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In order to reduce power consumption, many previously proposed MAC protocols for wireless sensor networks (WSNs) use a periodical active/sleep scheme. However, this scheme may not adapt to varying traffic conditions. A new throughput-adaptive MAC protocol (TA-MAC) is proposed in this paper, where overhearing nodes try to notify nodes a few hops away about the current transmission, therefore the latter...
Illumination makes an important role in realistic graphics rendering, especially in the mixed-scene rendering based on the geometric models and images. Adjusting illumination effect is a key step to achieve realistic scene when the images are inconsistent with the virtual environment. Therefore, complicated processing is required to generate the image with desired illumination condition. Using the...
In order to improve the discriminating capacity of the RFID tags for agricultural products traceability data, a new handling engine ORFID-CEP for complex events of agricultural products RFID Tag based on ontology, is proposed by introducing the event ontology model into the field of the agricultural products quality safety administration. In the new engine, the ontology model of RFID event, semantic...
High performance processing of agricultural data in the grid environment is a complex and hardly problem, mainly due to agricultural data's geographic distribution, heterogeneity, variety. A layered software architecture agriculture of agricultural data grid is designed. Agricultural meta-data model based spatio-temporal ontology, spatial clustering and mapping for agricultural data, information cooperation,...
In this paper, an easy solution to the upper and lower bound of the outage probability in ad hoc networks is presented. First we calculate the characteristic function of a model under power control. Then, we introduce some existing results under a special model which we call it the system model. By comparing the characteristic functions of the normalized interference under two models, we find that...
Agricultural knowledge representation, organization and integrated application in distribute environment is a complex and difficult problem, mainly due to the distributed, polymorphic and heterogeneous characteristics of the agricultural knowledge resources. In order to overcome the problem, an application framework which supports the agricultural production knowledge integration based on semantic...
The diagnosis of crop diseases and insect pests depends on the position, pest apparent, and the impact of physiological biochemical and ecological factors, etc., so it is difficult to meet the requirements for the credibility of solving goal by applying a conventional logic-reasoning model. On the basis of the analysis on pests and diseases with hierarchical structure, the fuzzy membership matrix...
In order to improve the synchronization efficiency of the high-capacity agriculture spatial data in the wireless network, a new 4-tuple synchronization model (MCOD) is proposed. The model represents the relationships among the atomic change types, synchronized data, synchronized operations and synchronized metadata. In this work, a new typology with 11 atomic change types of the agricultural features...
The analysis of geographical changes has been one of the important directions of the GIS research agenda over the past ten years. But an explicit representation of increment change which clearly describes the semantics of change and supports the database tracking of geographical changes are not completely considered within current researches. In order to clearly distinguish the increment change, we...
The distribution of the update information of topographic database is still one of the main open challenges for many data producers. The incremental method is transfer of a data set that is restricted to objects which have been changed since the last transfer. This paper focuses on the modeling and description of incremental information, which is the precondition of distribution. In order to accomplish...
Under the background of the requirement of high availability and high performance on the basis of the large-scale distributing type application in agriculture, makes more researches on the component cluster's application management, deployment management and performance management. Based on above researches, completes a developed platform for Electronic Agriculture with compatible J2EE standards....
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