Global ETD Search

1	Multidimensional Behavioral Complexes Boquet, Grant Michael 11 April 2008 (has links) In a preprint by J. Wood, V. Lomadze, and E. Rogers, chains and boundary maps were defined for 2-D discrete behavioral systems. The corresponding homology groups were studied and tied to trajectory properties. Indeed, the homology groups encapsulated the concepts of autonomy, controllability, and signal restriction. We shall present an extension of their work to n-D discrete behavioral systems. In particular, we shall streamline the construction of the chain groups, the boundary maps between chains, and the study of the resultant homology groups. While constructing this machinery, we shall point out intrinsic flaws in their approach that make extension of their results less systematic. Finishing remarks shall be made on using the homology groups to determine system properties and potentially classify forms of controllability. / Master of Science multidimensional systems theory homology Behavioral systems theory
2	RiTE: Providing On-Demand Data for Right-Time Data Warehousing Lehner, Wolfgang, Thomsen, Christian, Bach Pedersen, Torben 20 June 2022 (has links) Data warehouses (DWs) have traditionally been loaded with data at regular time intervals, e.g., monthly, weekly, or daily, using fast bulk loading techniques. Recently, the trend is to insert all (or only some) new source data very quickly into DWs, called near-realtime DWs (right-time DWs). This is done using regular INSERT statements, resulting in too low insert speeds. There is thus a great need for a solution that makes inserted data available quickly, while still providing bulk-load insert speeds. This paper presents RiTE ('Right-Time ETL'), a middleware system that provides exactly that. A data producer (ETL) can insert data that becomes available to data consumers on demand. RiTE includes an innovative main-memory based catalyst that provides fast storage and offers concurrency control. A number of policies controlling the bulk movement of data based on user requirements for persistency, availability, freshness, etc. are supported. The system works transparently to both producer and consumers. The system is integrated with an open source DBMS, and experiments show that it provides 'the best of both worlds', i.e., INSERT-like data availability, but with bulk-load speeds (up to 10 times faster). info:eu-repo/classification/ddc/004 ddc:004
3	Normal forms for multidimensional databases Lehner, Wolfgang, Albrecht, J., Wedekind, H. 02 June 2022 (has links) In the area of online analytical processing (OLAP), the concept of multidimensional databases is receiving much popularity. Thus, a couple of different multidimensional data models were proposed from the research as well as from the commercial product side, each emphasizing different perspectives. However, very little work has been done investigating guidelines for good schema design within such a multidimensional data model. Based on a logical reconstruction of multidimensional schema design, this paper proposes two multidimensional normal forms. These normal forms define modeling constraints for summary attributes describing the cells within a multidimensional data cube and constraints to model complex dimensional structures appropriately. Multidimensional schemas compliant to these normal forms do not only ensure the validity of analytical computations on the multidimensional database, but also favor an efficient physical database design. info:eu-repo/classification/ddc/004 ddc:004
4	Management of multidimensional aggregates for efficient online analytical processing Lehner, Wolfgang, Albrecht, J., Bauer, A., Deyerling, O., Günzel, H., Hummer, W., Schlesinger, J. 02 June 2022 (has links) Proper management of multidimensional aggregates is a fundamental prerequisite for efficient OLAP. The experimental OLAP server CUBESTAR whose concepts are described, was designed exactly for that purpose. All logical query processing is based solely on a specific algebra for multidimensional data. However, a relational database system is used for the physical storage of the data. Therefore, in popular terms, CUBESTAR can be classified as a ROLAP system. In comparison to commercially available systems, CUBESTAR is superior in two aspects. First, the implemented multidimensional data model allows more adequate modeling of hierarchical dimensions, because properties which apply only to certain dimensional elements can be modeled context-sensitively. This fact is reflected by an extended star schema on the relational side. Second, CUBESTAR supports multidimensional query optimization by caching multidimensional aggregates. Since summary tables are not created in advance but as needed, hot spots can be adequately represented. The dynamic and partition-oriented caching method allows cost reductions of up to 60% with space requirements of less than 10% of the size of the fact table. info:eu-repo/classification/ddc/004 ddc:004
5	Shrinked Data Marts Enabled for Negative Caching Lehner, Wolfgang, Thiele, Maik 15 June 2022 (has links) Data marts storing pre-aggregated data, prepared for further roll-ups, play an essential role in data warehouse environments and lead to significant performance gains in the query evaluation. However, in order to ensure the completeness of query results on the data mart without to access the underlying data warehouse, null values need to be stored explicitly; this process is denoted as negative caching. Such null values typically occur in multidimensional data sets, which are naturally very sparse. To our knowledge, there is no work on shrinking the null tuples in a multi-dimensional data set within ROLAP. For these tuples, we propose a lossless compression technique, leading to a dramatic reduction in size of the data mart. Queries depending on null value information can be answered with 100% precision by partially inflating the shrunken data mart. We complement our analytical approach with an experimental evaluation using real and synthetic data sets, and demonstrate our results. info:eu-repo/classification/ddc/004 ddc:004
6	Marital Satisfaction of Couples in Heterosexual Relationships Where There Are Differences in Spirituality Anaeche, Collins Ifeanyichukwu January 2020 (has links) No description available. Psychology Psychotherapy Behavioral Psychology Behavioral Sciences Clinical Psychology Counseling Psychology Families and Family Life Individual and Family Studies Mental Health Pastoral Counseling Personal Relationships Social Work Spirituality Religion Therapy marital satisfaction marital dissatisfaction couples heterosexual relationships differences spirituality religion religiosity multidimensional systems treatment emotional intimacy interpretative phenomenological analysis IPA

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