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Top-k monitoring queries are useful in many wireless sensor network applications. There is a well-known approach called FILA to process this kind of queries. Its basic idea is to install a filter at each sensor node to avoid unnecessary transmissions of sensor readings. FILA uses two algorithms to ensure the correctness and efficiency of the approach: a query reevaluation algorithm and a filter setting...
Several methods to index positions of moving objects have been proposed. Most of them are based on R-tree-like index structures. Some studies have made efforts to improve the update performance of R-trees, and they actually focus on query performance. Even though the update performance has been improved by virtue of those researchers' efforts, the overhead and immaturity of the concurrency control...
In this paper, we propose the localization algorithm using vector histogram matching method in environments with perpendicular walls. Conventional histogram matching method gets the wrong rotated value, because it has matched between other angle values when is a sharp rotation. In our proposed method, we do match angle values using direction of data. This method gets reference data and current data...
Bursty and out-of-order tuple arrivals complicate the process of determining the content and boundary of sliding windows. To process windows over such streams, two issues need to be addressed: how to sort input tuples efficiently and how to estimate punctuations. In this paper, we focus on these issues to process sliding windows efficiently and accurately over disordered streams. Regarding the first,...
For energy-efficient event-detection in sensor networks, we can perform an in-network join of two relations, i.e., a sensor table and a condition table, where a condition table is a set of tuples each of which contains condition information about a certain event. In this paper, we propose an in-network method for efficient join of a sensor table and a condition table. We also show through performance...
The advances in ubiquitous computing technologies have given rise to the u-Business, where we obtain business-related context information from ubiquitous devices to adapt to the changes of business environments in a timely manner. In these rapidly changing u-Business environments, we need a mechanism to modify business process schemas, which represent a group of business activities arranged in a meaningful...
To make BNT-BT ceramics, in this study, we put amount of small BaTiO3 (BT) which has the characteristics of the ferroelectric and the tetragonal structure at the normal temperature in BNT. The temperature goes up very fast to the maximum, 100degC for first 3 minutes and then it is saturated. We can recognize from the P-E curve that much more generation of heat is accompanied the impressed electric...
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