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— Wireless sensor network is an emerging technology that enables remote monitoring objects and environment. This paper proposes a protocol to track a mobile object in a sensor network dynamically. The previous researches almost focus on how to track object accurately and they do not consider the query for mobile sources. Additionally, they need not report(More)
Wireless communications and digital electronics have enabled the development of low-power, low-cost, multifunctional sensors. The functionality of sensor network mainly is the measurement collection. The previous proposed protocols mainly focus on broadcasting tree structure, but it may not be efficient in data gathering. In this paper, we propose novel(More)
If ubiquitous learning (u-learning) is to be effectively developed and feasibly applied to education, it is necessary to evaluate its effectiveness. Yet to achieve a sound evaluation, a particular paradigm must be employed to fit the problem domain. Toward this end, the authors of this study have adopted a meaningful learning paradigm. Meaningful learning(More)
In this paper, we propose a protocol for dynamically tracking a mobile object in a sensor network. The problem we discussed here is that one source object is set to track a mobile object, called a target, in a wireless sensor network. The source is moving to approach the target. In this kind of object tracking sensor networks, the activated sensor nodes can(More)
A mobile ad-hoc network (MANET) is a characteristized by multi-hop wireless links, in the absence of any cellular infrastructure, as well as frequent host mobility. Existing on-demand multicasting protocols are categorized into tree-based and mesh-based strategies. In this paper, we propose a new on-demand multicast routing protocol, named(More)
—For data-collection applications in sensor networks, it is important to ensure base station receives a complete picture about the monitored area. Convergecast is an important communication pattern commonly used to collect continuous data. The prior broadcast trees are not suitable for convergecast, because convergecast is a reverse broadcast process. We(More)