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The location-based alert service is the one of the most practical location- based services. It alerts mobile users when approaching and entering into or leaving from a specific region, and provides certain services previously set by the users. To provide the service, the location of mobile users needs to be acquired periodically. However, a server which handles the location of users gets more burdens...
In this paper, we propose a scheme for double-layered mobile P2P systems that enhances energy efficiency by modifying PSM(Power Saving Mode) defined in 802.11. The proposed scheme lengthens the beacon interval adaptively and adopts a known power saving scheme for more power saving. The experimental results showed that the proposed scheme improved 58.3% in terms of the average energy saving and 10%...
An investigation of open-contact failures in semiconductor devices is common issue. As we changed the cleaning condition of the contact, open failure happened. This contact has nitride in it and recess profile under it. To solve ambiguous fail mechanism we used various analysis methods. Especially, double XTEM sample image was the key and we confirmed the mechanism by reproducing experiment.
In the mobile environment, effective use of limited energy of mobile devices is ever required. Especially, in a mobile peer-to-peer (P2P) system, if a mobile device uses all its energy up, it can no longer participate in the system. Furthermore, as the number of peers without energy increases, so does the file search failure rate of the system. In this paper we present an energy-effective routing...
In the double-layered mobile peer-to-peer (P2P) systems, peers are classified into two types, super peers and sub-peers; a super peer manages its sub-peers. The communications are done mostly among super peers to reduce the network traffic in searching files. In mobile networks, reliability that guarantees communications among peers is one of the crucial factors. However, most of the previous P2P...
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