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  • Chain-conflicting serializability  (1)
  • Key words:Multimedia – Presentation – Synchronization  (1)
  • hierarchical clustering  (1)
  • multi-resolution wavelet transform  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    A theory of global concurrency control in multidatabase systems (1993)
    Springer
    The VLDB journal 2 (1993), S. 331-360 
    Details
    ISSN: 0949-877X
    Schlagwort(e): Chain-conflicting serializability ; sharing serializability ; hybrid serializability ; optimality
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract This article presents a theoretical basis for global concurrency control to maintain global serializability in multidatabase systems. Three correctness criteria are formulated that utilize the intrinsic characteristics of global transactions to determine the serialization order of global subtransactions at each local site. In particular, two new types of serializability, chain-conflicting serializability and sharing serializability, are proposed and hybrid serializability, which combines these two basic criteria, is discussed. These criteria offer the advantage of imposing no restrictions on local sites other than local serializability while retaining global serializability. The graph testing techniques of the three criteria are provided as guidance for global transaction scheduling. In addition, an optimal property of global transactions for determinating the serialization order of global subtransactions at local sites is formulated. This property defines the upper limit on global serializability in multidatabase systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01228674
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Dynamic playout scheduling algorithms for continuous multimedia streams (1999)
    Springer
    Multimedia systems 7 (1999), S. 312-325 
    Details
    ISSN: 1432-1882
    Schlagwort(e): Key words:Multimedia – Presentation – Synchronization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract. In this paper, we investigate a playout scheduling framework for supporting the continuous and synchronized presentations of multimedia streams in a distributed multimedia presentation system. We assume a situation in which the server and network transmissions provide sufficient support for the delivery of media objects. In this context, major issues regarding the enforcement of the smooth presentation of multimedia streams at client sites must be addressed to deal with rate variance of stream presentations and delay variance of networks. We develop various playout-scheduling algorithms that are adaptable to quality-of-service parameters. The proposed algorithms permit the local adjustment of unsynchronized presentations by gradually accelerating or retarding presentation components, rather than abruptly skipping or pausing the presentation materials. A comprehensive experimental analysis of the proposed algorithms demonstrates that our algorithms can effectively avoid playout gaps (or hiccups) in the presentations. This scheduling framework can be readily used to support customized multimedia presentations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s005300050133
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    A Multi-Resolution Content-Based Retrieval Approach for Geographic Images (1999)
    Springer
    Geoinformatica 3 (1999), S. 109-139 
    Details
    ISSN: 1573-7624
    Schlagwort(e): geographical image retrieval ; multi-resolution wavelet transform ; texture features ; hierarchical clustering
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geographie
    Notizen: Abstract Current retrieval methods in geographic image databases use only pixel-by-pixel spectral information. Texture is an important property of geographical images that can improve retrieval effectiveness and efficiency. In this paper, we present a content-based retrieval approach that utilizes the texture features of geographical images. Various texture features are extracted using wavelet transforms. Based on the texture features, we design a hierarchical approach to cluster geographical images for effective and efficient retrieval, measuring distances between feature vectors in the feature space. Using wavelet-based multi-resolution decomposition, two different sets of texture features are formulated for clustering. For each feature set, different distance measurement techniques are designed and experimented for clustering images in a database. The experimental results demonstrate that the retrieval efficiency and effectiveness improve when our clustering approach is used.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1009859912970
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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