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With the advancement in IT including mass storage device and super-fast communication, cloud computing is now in high demand. At the same time, the explosive increase in the volume of diverse and extensive data has brought forth the age of big data organized as countless directories within a file system. The exponential increase in data volumes causes slow retrieval of metadata of the requested files...
Effective manipulation of context is very important in the research of context-awareness. In recent years, thus, a variety of context models have been proposed to properly handle the key aspects of the context, while focusing on scenario-based acquisition, management, and representation of context. However, they are difficult to be employed for agent system requiring distributed reasoning. In this...
Wireless sensor networks are widely used for gathering data in an autonomous fashion. Since sensors are power constrained devices, it is quite important for them to minimize the energy consumption. In this paper we propose a novel tree-based clustering (TBC) approach for energy efficient wireless sensor networks. Here the nodes in a cluster form a tree with the root as the cluster-head, while the...
Mobile IPTV is one of the hot applications capitalizing recently advanced wireless communication technologies. This paper proposes a new vertical handover scheme based on the prediction of mobility of mobile node. In contrast with the existing schemes, the proposed approach considers the movement velocity and direction of the MN, and Received Signal Strength (RSS) for accurate prediction of the MN's...
Context-awareness service is one of the key features of ubiquitous paradigm. To intelligently and sensitively deal with the dynamic environment, a methodology effectively enabling the agent-based distributed reasoning needs to be developed. The existing modeling approaches focus on scenario-based acquisition, management, and representation of context. However, they are difficult to be adapted to agent-based...
Today, VoD is an important technology for many applications, and a number of periodic broadcasting schemes have been proposed to support a large number of receivers. However, these schemes are not suitable to the environment where wired and wireless devices coexist. With the existing schemes dealing with heterogeneous receivers, the service latency of low-end clients is reduced by sacrificing that...
The demand on high speed Internet access has been rapidly growing due to various multimedia applications requiring high speed data transmission. WiMAX based on IEEE 802.16 standard is one of the most effective technologies among the existing solutions. With the current multicasting technique, the base station receives duplicated multicast IP datagrams via GRE Tunnel, which significantly degrades the...
In pervasive computing environment a number of distributed applications asynchronously exchange data using the event-based mechanism. The OMG defined CORBA Event Service for asynchronous messaging, which provides a flexible channel for asynchronous communication among the distributed and collocated objects. In the existing Event Service channels are created manually by the developers or users to process...
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