This paper reports a phenomenographic study of how introductory students view objects that have been created and stored by an object-oriented program. By analyzing student interviews, we identify five categories of description, each representing a different kind of understanding of the phenomenon. Of these categories, some represent viable understandings that we would like our students to have....

Traditionally, text is stored on computers as a stremn of characters. The goal of this research is to store text in a form that facilitates word manipulation whilst reducing storage space. A word list with syntactic linear ordering is stored and words in a text are given two-byte integer codes that point to their respective positions in this list. The implementation of the encoding scheme is de...

Active XML (AXML) documents combine extensional XML data with intentional data defined through Web service calls. The dynamic properties of these documents pose challenges to both storage and data materialization techniques. We present ARAXA, a non-intrusive approach to store AXML documents. It takes advantage of complex objects from object-relational DBMS to represent both extensional and inte...

INTRODUCTION Ever since the Extensible Markup Language (XML) (W3C, 1998b) began to be used to exchange data between diverse sources, interest has grown in deploying data management technology to store and query XML documents. A number of approaches propose to adapt relational database technology to store The advantage is that the XML repository inherits all the power of mature relational techno...

RDF is the first W3C standard for enriching information resources of the Web with detailed meta data. The semantics of RDF data is defined using a RDF schema. The most expressive language for querying RDF is RQL, which enables querying of semantics. In order to support RQL, a RDF storage system has to map the RDF graph model onto its storage structure. Several storage systems for RDF data have ...

This paper investigates how new database technologies, in particular, complex object databases, object-oriented databases, and deduc-tive databases, can be used to store object-oriented graphic data and discusses the related problems.

Social platforms such as Facebook and Twitter have been growing exponentially in the last few years. As a result of this growth, the amount of social data increased enormously. The need for storing and analyzing social data became crucial. New storage solutions – also called NoSQL – were therefore created to fulfill this need. This thesis will analyze the structure of social data and give an ov...

Many web applications operate on large amount of web data. How to store and access the data itself is becoming a serious problem, especially with the dynamic of the web. This paper introduces an approach that helps applications to manage evolving web data efficiently, saving a lot of storage space with fast access to the data. One important feature of this framework is that the worst case of ra...

Tree-structured data are abundant today, ranging from Bioinformatics suffix-tree alignments, to multi-resolution video, to directory-file hierarchies, to XML. The storage techniques employed by systems that manage tree-structured data greatly affect their performance. Current approaches either map the tree data to an underlying relational database system, or use the abstraction provided by a ge...

Both food-storing behaviour and the hippocampus change annually in food-storing birds. Food storing increases substantially in autumn and winter in chickadees and tits, jays and nutcrackers and nuthatches. The total size of the chickadee hippocampus increases in autumn and winter as does the rate of hippocampal neurogenesis. The hippocampus is necessary for accurate cache retrieval in food-stor...