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Aiming at finding the $k$ nodes with the highest readings among sensor nodes, top- $k$ query is a very important and useful query in wireless sensor networks (WSNs). Current studies about top- $k$ query in WSNs mainly focus on always-on WSNs (A-WSNs) where sensors always stay awake and little research pays attention to top- $k$ query in duty-cycled WSNs (D-WSNs) in which sensors are dynamically...
In dense mobile wireless sensor networks, it is desirable to reduce traffic for data gathering as much as possible while satisfying an application requirement. In this paper, focusing on an application which monitors the time-variant shape of events, we discuss an approach to achieve an efficient monitoring with small traffic in dense mobile wireless sensor networks.
In mobile ad hoc networks (MANETs), locationbased service (LBS) is a typical application. In a LBS, it is valuable for each node to grasp the convex hull of nodes which compose a network by using a convex hull query. However, if the query-issuing node acquires the information on all the nodes, the information on nodes which are not the vertexes of the convex hull is replied, which is unnecessary for...
As personalization technologies are widely used, preference extraction is becoming important. In this work, we propose a preference extraction method on the basis of applications that are installed on a user's smart device. In this method, keywords are extracted from descriptions of the installed applications on an application market. Then, each keyword is scored by three scoring criteria: degree...
This paper describes our attempt to extract various relations between super ordinate concepts from terabytes of Web corpus for human-like speculation of the meaning of unknown terms. In order to discover various conceptualized relations, we focus on Web-scale text corpora and introduce a simple string-matching method to process them. To derive relations between concepts, our method first extracts...
In dense mobile wireless sensor networks, it is desirable to gather sensor data with as low traffic as possible. When an application requires geographical boundaries of sensor readings, it is able to satisfy the requirement while reducing traffic by gathering sensor data only from nodes located close to the boundaries. In order to do so, it is necessary to detect nodes located close to the boundaries...
In this paper, we propose a novel sensor data collection method on an overlay network that forwards messages to the nodes that are suitable for reconstructing a sensor data distribution. When there is an enormous number of sensors, it is redundant to collect all sensor data from a target area since geographically close sensor data can be interpolated. Some methods treat reconstructing a contour lines...
In this paper, we propose a novel sensor data collection method that forwards messages to the nodes which are suitable for reconstructing of the sensor data distribution by extending hierarchical Delaunay overlay network (HDOV). By our proposal method, contour lines map can be reconstructed according to the requirements, satisfying a specified system constraint of the number of sensor data. The key...
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