Similarity‐Based Clustering Strategy for Mobile Ad Hoc Multimedia Databases

Abstract

Abstract. Multimedia data are becoming popular in wireless ad hoc environments. However, the traditional content-based retrieval techniques are inefficient in ad hoc networks due to the multiple limitations such as node mobility, computation capability, memory space, network bandwidth, and data heterogeneity. To provide an efficient platform for multimedia retrieval, we propose to cluster ad hoc multimedia databases based on their semantic contents, and construct a virtual hierarchical indexing infrastructure overlaid on the mobile databases. This content-aware clustering scheme uses a semantic-aware framework as the theoretical foundation for data organization. Several novel techniques are presented to facilitate the representation and manipulation of multimedia data in ad hoc networks: 1) using concise distribution expressions to represent the semantic similarity of multimedia data, 2) constructing clusters based on the semantic relationships between multimedia entities, 3) reducing the cost of content-based multimedia retrieval through the restriction of semantic distances, and 4) employing a selfadaptive mechanism that dynamically adjusts to the content and topology changes of the ad hoc networks. The proposed scheme is scalable, fault-tolerant, and efficient in performing content-based multimedia retrieval as demonstrated in our combination of theoretical analysis and extensive experimental studies.

Evaluation of P2P multimedia clustering techniques in JXTA-Overlay

“…Yang et al [26] used similarity-based clustering strategy for mobile ad hoc multimedia databases aiming to build an efficient platform for multimedia retrieval. The authors used a content-aware clustering scheme based on a semantic-aware framework for data organization.…”

High Performance Publish/Subscribe Middleware for Mobile Wireless Networks

“…Data dissemination and management are important in the context of many mobile systems including publish/subscribe systems. Yang et al [30] present techniques for content-based multimedia retrieval in mobile ad hoc networks. Caching and replication of data have been used in mobile systems to improve system performance and reliability.…”

Seamless MANET Autoconfiguration through Enhanced 802.11 Beaconing

“…Their characteristics in terms of flexibility and cost have made them the candidate technology for different applications such as rescue and military scenarios [14], information dissemination in vehicular networks [22], multimedia databases [1], or even video communication between peers [18]. However, even after a decade of research efforts, their ease-of-use is still quite low, making it a technology only accessible for experts.…”