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Wireless sensor networks (WSN) have been used in various application areas and will be more prosperous in the future. The technology of localization, by which the position of blind node can be acquired, is a significant factor and one of the supporting technologies in WSN. Most of the existing localization algorithms in sensor networks mainly depend on one simple model and can only be used in a given...
With the development of high resolution images technique, large scale data intensive computing and computing-intensity is highly demanded. However, isolated storage and dispersive management cannot meet exponentially increasing demand for storage and management of crop images. On the basis of the crop images grasped by our independent developed agricultural intelligent search engine, a kind of extraction...
This paper presents a load sensing multi-thread web service model, in which web service is abstracted into M/M/c queue, and the optimal thread number is studied. The model introduced a thread performance loss function to reflect the influence of system load on service efficiency. The optimal load sensing thread number is studied by analyzing the relations between service throughput, average response...
In order to satisfy the requirements of the government officials of small towns for handling official business on the spot in country area. A small town e-Government system based on Wireless communications technology, Global Positioning System (GPS) technology and Embedded Development Technology was developed. The system can run at the mobile equipments, such as Personal Data Assistant (PDA), intelligent...
In order to better use with massive, heterogeneous, multimode and other characteristics of information, eliminate redundancy, the formation of the system environment is relatively complete and consistent description. It can ensure rapid and correct decision-making, planning and reflection. In this paper, a multimode information fusion method is proposed aimed at the shortcomings of hierarchical structure...
A growing number of organizations and individuals improve efficiency by utilizing geographical data. When the geographical data are updated, the changed information must be transferred to the end-users to keep their client-databases current. Distinguishing and identifying the change types of the geographical objects is the premise of transferring the change information. But now the methods for classifying...
In this paper, we propose two novel algorithms where relay selection and power allocation are jointly considered in order to optimize ergodic capacity in AF (Amplify-and-forward) cooperative diversity communication. In S-AR algorithm, joint power allocation and relay selection is performed to maximize the received SNR at the destination node. In S-OR algorithm, the best relay with maximal instantaneous...
We consider energy-efficient Distributed Detection in wireless sensor networks. It is assumed that a group of sensors observe the same quantity in independent additive observation noises with possibly different variances. Each node computes a local statistic and communicates it to a fusion center over Rayleigh fading wireless channels.At the fusion,the linear minimum mean square error (LMMSE) is used...
Frame rate up-conversion (FRUC) is effective to enhance video quality at LCD TV. In this paper, a new method based on matching classification and dominant objects tracking is proposed. Blocks to be interpolated are classified into 4 types: matched, unmatched, uncertain and unrelated according to the results of bilateral block matching. Dominant object tracking helps to refine the results. Then an...
In this paper, the transmission capacities of two coexisting wireless networks (primary network and secondary network) in the same geographic region and sharing the same spectrum are derived. The primary (PR) network has a higher priority to access the spectrum, while the secondary (SR) network limits its interference to the PR network by controlling its transmission intensity. Considering spread-spectrum...
IEEE 802.22 is the first worldwide wireless standard based on Cognitive Radio (CR) for Wireless Regional Area Networks (WRAN). Usually, Secondary Users (SUs) have to be interrupted periodically for spectrum sensing so as to avoid interference to Primary Users (PUs) operating in the licensed bands. Such interruptions of data transmission, however, impair the Quality of Service (QoS) of SUs. Dynamic...
In this paper, the transmission capacities of two coexisting wireless networks (primary network and secondary network) in the same geographic region and sharing the same spectrum are derived. The primary (PR) network has a higher priority to access the spectrum, while the secondary (SR) network limits its interference to the PR network by controlling its transmission intensity. Considering spread-spectrum...
In the progress of standardization of 3GPP Long Term Evolution (LTE), it is of the most importance to ensure the coexistence between LTE system and other systems. This paper is aiming at presenting a clear is deployed co-existed with TD-SCDMA system, which has been deployed in China. Monte Carlo simulation is used to get the statistic results. The two systems are assumed to have similar uplink and...
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....
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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