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Optimistic replication which does not lock resources and can tolerate disconnections appears to be the natural choice for mobile computing environment. The replication approach allows updates to be performed independently at any replica, so the fundamental problem in this scheme is that data at any replica has the probability of invalidation. To resolve this problem, this paper presents a new dynamic...
In this paper we describe a framework to automatically customize an ongoing communication service whenever a terminal discovers a new link (either wireless or wire-line), which can be used for communication as a secondary link to the Internet. This framework makes use of the information that the server can obtain, as well as the ability to communicate using two links simultaneously at the terminal...
The importance in sensor networks is power saving. And middleware is located between operation system and application. Middleware in sensor networks is responsible to process data effectively to minimize spending energy of sensors. LEACH is middleware based clustering. But LEACH has the problem that Head node spends the more energy then others. Therefore this paper proposes to effectively process...
We propose a new handover scheme for solving long latency time and triangle routing problems of MIP (mobile IP). The proposed scheme supports L3 mobility using the L2 information of terminal and data tunneling between edge routers. In these characteristics, it has the lower latency time of handover procedure and the lower transmission delay of data packet, than MIP.
The object of The MASAM methodology is providing the process for developing the application SW operated on mobile platform. The mobile application SW has closely connected to the communications environment and has the feature in which there is the immediate reaction of a user while being operated. Moreover, it is important to positively accommodate the demand of a user and rapidly launch a product...
Ranging schemes have been used for timing synchronization and power control between a base station (BS) and personal subscriber stations (PSS). They are also used for bandwidth request and handoff in WiBro systems. In this paper, we present the ranging mechanism in WiBro in a view of contention resolution for ranging access. Performances of success rate and delay are assessed since they greatly affect...
As the importance of sensor networks for the realization of ubiquitous world is recognized, the various aspects research for static sensor networks, that does not support the mobility of node, is underway. Medical sensor network (MSN) assuming the mobility of node takes notice as one of the highlight USN applications, but the research on the security issue for the environments is not enough even though...
Location-based service (LBS) is a great potential application for the mobile communications. Design and implementation for location-based service platform is presented in this paper. This platform is divided into client side and server side. Client side of this platform software is developed based on the following techniques: mobile SVG based JSR226 and JSR179 specification, Bluetooth, mobile media,...
BcN wireless users are rapidly increasing in WiBro and HSDPA service. BcN wireless service not only supports voice service but also video and data service. Video and data service require complex QoS metrics for assuring stable service especially in real-time environment. However, because of the limitation of radio resource, it is hard to fulfill QoS requirement. It is expected that there will be troubles...
In this paper we present the model of smart collaborative objects that can share the responsibilities of backend server by local processing and collaborating with other objects. We propose the technique to adapt the local inferring using the distributed knowledgebase and a framework for development of context aware software for smart environment We also propose a platform for collaborative object...
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