Tài liệu Advances in Database Technology- P16 pptx

... changes and maintain good levels of resource provisioning for applications. Finally, critical areas that involve contin- uously changing and voluminous spatio-temporal data include intelligent ... present in the original After all, we have obtained that series by discarding data points in the original, and we never invented new data points, let alone time stamps. Assume that has data poin...

Ngày tải lên: 24/12/2013, 02:18

... could be obtained through mining or just from in- formation retrieval. Data mining is an important tool in making the web more intelligent. That is, data mining may be used to mine the data on ... with work on information systems engineering involving, for example, databases and web services. E. Bertino et al. (Eds.): EDBT 2004, LNCS 2992, pp. 3–16, 2004. © Springer-Verlag Berlin Heidelbe...

Ngày tải lên: 14/12/2013, 15:15

... operators (point, range, tree structure, nearest neighbor, skyline, etc.) Additionally, there are applications for creating databases, loading (bulk and random insertion), inspecting the database/ index ... exclusion constraints). Allowing union in the query language is crucial for being able to extract indefinite disjunctive information from an inconsistent database (see Ex- ample 1). F...

Ngày tải lên: 21/01/2014, 08:20

... spatial index over object locations. Indexing Queries. The second centralized approach to processing spatial continuous queries on moving objects is by indexing queries. In this approach a spatial index, ... watermark. Energy-Conserving Air Indexes for Nearest Neighbor Search 51 Fig. 1. Data and Index Organization Using the Interleaving Technique for broadcasting along with the data objects...

Ngày tải lên: 14/12/2013, 15:15

... minimize the information loss in moving from clustering to clustering This information loss is given by We can also view the information loss as the increase in the uncertainty. Recall that Since H(A) ... Constrained Indexing and Query Indexing are proposed for efficient evaluation of this kind of queries at a central location. Several other indexing structures and algorithms for handling...

Ngày tải lên: 14/12/2013, 15:15

... is based upon ciphertext, while, in the second, the intermediate index is based upon plaintext and the final index is obtained by encrypting the intermediate index. Based upon characteristics ... xor-ing them) to obtain ciphertext. Decryption involves reversing the process: combining the key-stream with the ciphertext to obtain the original plaintext. Along with the initial encryption key,...

Ngày tải lên: 14/12/2013, 15:15

... Preserving Data Mining 187 We maintain the total number of records in that group. This number is denoted by We make the following simple observations: Observation 1: The mean value of attribute in ... predicates in between and not involving prefix-matching, whereas with or it is the number of equality predicates in between and a constant or between and a constant not involving prefix-...

Ngày tải lên: 14/12/2013, 15:15

... relational databases into an XML format or to store the information in an XML object in a relational database, increasing the cost of e-business development. Moreover, specifying the mapping in the ... USA, 2002. J. Chomicki. Querying with intrinsic preferences. In Proc. of the Int. Conf. on Advances in Database Technology (EDBT), Prague, Czech Republic, 2002 R. Fagin, A. Lotem...

Ngày tải lên: 14/12/2013, 15:16

... environment. 5.3 Phonetic Indexing We now outline a phonetic indexing technique that may be used for accessing the near- equal phonemic strings, using a standard database index. We exploit the following two facts ... extending the approximate indexing techniques outlined in [1, 21] for creating a metric index for phonemes. We are working on an inside-the-engine implementation of LexEQUAL...

Ngày tải lên: 14/12/2013, 15:16

... designing the annotation specifications, considering the specifics of data integrity constraint checking, and ascertaining the impact on particular tools remain challenging (and interesting) tasks. focuses ... watermark. Computing and Handling Cardinal Direction Information 335 Fig. 3. Polygon clipping 3 Computing Cardinal Direction Relations Typically, in Geographical Information Systems a...

Ngày tải lên: 14/12/2013, 15:16