a new perspective on NF 2 (2008)
M. Van Keulen, J. Vonk, J. Flokstra, H. E. Blok
Moa and the multi-model architecture:
Content-based Video Indexing for the Support of Digital Library Search (2008)
M. Petković, R. Van Zwol, H. E. Blok, W. Jonker
Recent advances in computing, communications and data storage have led to an increasing number of large digital libraries, which are nowadays publicly available on the Internet. However, to find...
Top N optimization issues in MM databases (2007)
In multi media (MM) DBMSs the usual way of operation in case of a MM retrieval query is to compute some ranking based on statistics and distances in feature spaces. The MM objects are then sorted by...
Content-based Video Indexing for the Support of Digital Library Search (2007)
M. Petković, R. Van Zwol, H. E. Blok, W. Jonker
Recent advances in computing, communications and data storage have led to an increasing number of large digital libraries, which are nowadays publicly available on the Internet. However, to find...
Top N MM query optimization The best of both IR and DB worlds (2007)
It is commonly recognized that top N queries belong to one of the most important query classes in IR and MM retrieval, or more general, content based retrieval. A lot of work has been done on query...
Blanken, H.M., De Vries, A.P., Blok, H.E., Feng, L.
Retrieval of multimedia data is different from retrieval of structured data. A key problem in multimedia databases is search, and the proposed solutions to the problem of multimedia information...
Handling Uncertainty and Ignorance in Databases: A Rule to Combine Dependent Data (2006)
Choenni, R.S., Blok, H.E., Leertouwer, E.
In many applications, uncertainty and ignorance go hand in hand. Therefore, to deliver database support for effective decision making, an integrated view of uncertainty and ignorance should be taken....
The TIJAH XML information retrieval system (2006)
Blok, H.E., Mihajlovic, V., Ramirez, G., Westerveld, T.H.W., Hiemstra, D., De Vries, A.P.
Exploiting Query Structure and Document Structure to Improve Document Retrieval Effectiveness (2006)
Mihajlovic, V., Hiemstra, D., Blok, H.E., Apers, P.M.G.
In this paper we present a systematic analysis of document retrieval using unstructured and structured queries within the score region algebra (SRA) structured retrieval framework. The behavior of...
Vague Element Selection and Query Rewriting for XML Retrieval (2006)
Mihajlovic, V., Hiemstra, D., Blok, H.E.
In this paper we present the extension of our prototype three-level database system (TIJAH) developed for structured information retrieval. The extension is aimed at modeling vague search on XML...
Mihajlovic, V., Ramirez, G., Westerveld, T.H.W., Hiemstra, D., Blok, H.E., De Vries, A.P.
Retrieving information from heterogeneous data sources in a flexible manner and within a single (database) framework is still a challenge. In this paper we present several extensions of our prototype...
TIJAH: Embracing IR Methods in XML Databases (2005)
List, J.A., Mihajlovic, V., Ramirez, G., De Vries, A.P., Hiemstra, D., Blok, H.E.
This paper discusses our participation in INEX (the Initiative for the Evaluation of XML Retrieval) using the TIJAH XML-IR system. TIJAH's system design follows a `standard' layered database...
TIJAH at INEX 2004 - Modeling Phrases and Relevance Feedback (2005)
Mihajlovic, V., Ramirez, G., De Vries, A.P., Hiemstra, D., Blok, H.E.
This paper discusses our participation in INEX using the TIJAH XML-IR system. We have enriched the TIJAH system, which follows a standard layered database architecture, with several new features. An...
Extending the Relational Model with Uncertainty and Ignorance (2004)
Choenni, R.S., Blok, H.E., Fokkinga, M.M.
It has been widely recognized that in many real-life database applications there is growing demand to model uncertainty and ignorance. However the relational model does not provide this possibility....
An XML-IR-DB-Sandwich: Is it Better with an Algebra in Between? (2004)
Mihajlovic, V., Hiemstra, D., Blok, H.E., Apers, P.M.G.
In this paper we address the problem of immediate translation of XPath+IR queries to relational database expressions and exert the benefits of using an intermediate algebra. Adding an intermediate...
The Multi-model DBMS Architecture and XML Information Retrieval (2003)
De Vries, A.P., List, J.A., Blok, H.E.
Since long, computer science has distinguished between information retrieval and data retrieval, where information retrieval entails the problem of ranking textual documents on their content (with...
Moa and the multi-model architecture: a new perspective on XNF2 (2003)
Van Keulen, M., Vonk, J., De Vries, A.P., Flokstra, J., Blok, H.E.
Advanced non-traditional application domains such as geographic information systems and digital library systems demand advanced data management support. In an effort to cope with this demand, we...
Content-based video indexing for the support of digital library search (2002)
Petkovic, M., Zwol Van, R., Blok, H.E., Jonker, W., Apers, P.M.G., Windhouwer, M., ...
Presents a digital library search engine that combines efforts of the AMIS and DMW research projects, each covering significant parts of the problem of finding the required information in an enormous...
Database Optimization Aspects for Information Retrieval (2002)
There is a growing need for systems that can process queries, combining both structured data and text. One way to provide such functionality is to integrate information retrieval (IR) techniques in a...
Moa: extensibility and efficiency in querying nested data (2002)
Van Keulen, M., Vonk, J., De Vries, A.P., Flokstra, J., Blok, H.E.
Advanced non-traditional application domains such as geographic information systems and digital library systems demand advanced data management support. In an effort to cope with this demand, we...
H.E.: Flexible and Scalable Digital Library Search (2001)
M. A. Windhouwer, A. R. Schmidt, R. Van Zwol, M. Petkovic, H. E. Blok, Menzo Windhouwer, ...
CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics. CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below...
ABSTRACT Flexible and Scalable Digital Library Search (2001)
M. A. Windhouwer, A. R. Schmidt, R. Van Zwol, M. Petkovic, H. E. Blok, Menzo Windhouwer, ...
CWI is a founding member of ERCIM, the European Research Consortium for Informatics and Mathematics. CWI's research has a theme-oriented structure and is grouped into four clusters. Listed below...
Blok, H.E., De Vries, A.P., Blanken, H.M., Apers, P.M.G.
Data abstraction and query processing techniques are usually studied in the domain of administrative applications. We present a case-study in the non-standard domain of (multimedia) information...
Flexible and scalable digital library search (2001)
Blok, H.E., Windhouwer, M.A., Van Zwol, R., Petkovic, M., Apers, P.M.G., Kersten, M.L., ...
Blok, H.E., Hiemstra, D., Choenni, R.S., Blanken, H.M., Apers, P.M.G.
Efficient, flexible, and scalable integration of full text information retrieval (IR) in a DBMS is not a trivial case. This holds in particular for query optimization in such a context. To facilitate...